JP2011135947A - Bubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bubble generator capable of automatically removing clogging of a filter, even when the clogging occurs in the filter, in the case where the filter is installed in an air intake portion. <P>SOLUTION: When an instantaneous and rapid increase in internal pressure acts on a passage 531 which communicates with an end nozzle facing a swirling chamber of a circulation adapter and on which a fluctuation in the internal pressure of the swirling chamber acts, a piston 56 advances to the side of a transmission wall 54 against an urger 57. The transmission wall 54 receives an air exhaust flow from behind, and discharges garbage, adhering to a surface, to an atmospheric side. When negative pressure acts from the swirling chamber, the piston 56 is restored to make a check valve 55 opened by being bent, and air transmitted through the transmission wall 54 is taken into the end nozzle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bubble generating device that is provided in a bathtub and discharges minute bubbles into the bathtub water in the bathtub, and in particular, it can automatically remove clogging of a filter member to save labor in maintenance work. At the same time, it relates to a technology that can withstand long-term continuous use.

  Conventionally, a circulation operation is performed in which the bathtub water is taken out from the bathtub and then returned to the bathtub, and air is taken into the circulating water using negative pressure based on the discharge flow when the circulating water is returned to the bathtub. Therefore, a bubble generating device has been proposed in which bubbles are mixed and discharged into a bathtub.

  For example, in Patent Document 1, the downstream end of the air intake pipe is connected to the vicinity of the discharge port of the hot water circulation path, while the intake port that is the upstream end of the air intake pipe is installed at the upper position of the bathtub, and It has been proposed to install a solenoid valve in the middle of the air intake pipe.

  In Patent Document 2, an intake port that is the upper end of an air intake pipe (intake pipe) is installed in a space below the flange of the bathtub so as to open to a position higher than the bathtub water level in the bathtub, and the intake air thereof It has been proposed to provide a check valve that biases the mouth.

  On the other hand, Patent Document 3 proposes a technique for cleaning a filter attached to a suction unit installed on a bathtub wall in order to circulate and heat the bathtub water. That is, a filter is arranged facing the bathtub, and dust contained in the bathtub water is collected by the filter when the bathtub water is sucked in, and a pump is used to clean the collected garbage. It is proposed that the circulating flow is reversed by reversing the flow and the collected dust is discharged from the filter to the bathtub side by this reverse flow.

Japanese Utility Model Publication No. 1-194525 Japanese Utility Model Publication No. 8-182717 Japanese Examined Patent Publication No. 63-38628

  By the way, in order to prevent dust and dust in the atmosphere from being sucked when air is taken in to generate bubbles, a filter member is generally installed at the air inlet of the air intake part.

  However, if the filter member is clogged with dust or dust, the air intake is hindered and the amount of bubbles generated is reduced. For this reason, the work burden that the regular maintenance is needed in order to remove the clogging of the filter member is caused.

  On the other hand, the present inventor proposed in a previous application (for example, Japanese Patent Application No. 2009-249102) a bubble generation device that realizes a bubble generation function using a circulation flow for recirculation in a circulation adapter attached to a bathtub. However, in the bubble generating device, it is possible to eliminate the risk of water leakage while omitting the construction of installing an air intake pipe with an intake port and a check valve for taking air into the circulation adapter outside the bathroom. A bubble generator is proposed.

  And also in the bubble generating device according to this proposal, since a filter member for preventing the inhalation of dust and dirt in the atmosphere or a member in place of it is necessary, a regular period for removing clogging in the same manner as described above. Maintenance may be required.

  The present invention has been made in view of such circumstances, and the object of the present invention is that even when the filter member is clogged when the filter member is installed in the air intake portion, An object of the present invention is to provide a bubble generating device capable of automatically removing clogging.

  In order to achieve the above object, according to the present invention, a front end portion is opened facing a discharge flow path of hot water discharged from the wall surface of the bathtub into the bathtub, and air is discharged from the front end portion by the discharge flow flowing through the discharge flow path. The following specific matters are provided for the bubble generating device arranged so that the gas is taken in. That is, as an air intake portion that communicates with the tip portion and takes in air from the external space, a filter member disposed on the external space side, and the filter member disposed on the tip portion side with respect to the filter member. While the air taken in from the space is allowed to pass through, it is configured to include a backflow prevention means for blocking the passage of water to the external space side. And the said backflow prevention means was arranged so that it could advance / retreat with respect to the channel | path between the said filter member side and the said front-end | tip part side (Claim 1).

  In the case of the present invention, when the supply of the discharge flow to the discharge flow path is started to start the bubble generation operation, the internal pressure in the discharge flow path where the tip portion is open is temporarily increased with the start of supply of the discharge flow. When the internal pressure rises through the tip portion, the backflow prevention means is moved forward in the passage toward the filter member. By the forward operation of the backflow prevention means, the airflow from the back side acts on the filter member in the direction opposite to the airflow at the time of taking air into the filter member. For this reason, even if dirt or dust in the air adheres to the external space side of the filter member, the dust or dust is peeled off from the filter member by the air flow from the back to the filter member and Will be released. Then, the backflow prevention means receives an internal pressure drop in the discharge flow path and then moves backward from the filter member, and receives air by receiving a negative pressure (differential pressure with respect to the external space) accompanying the discharge flow. Thus, it is mixed into the discharge flow from the tip portion, and bubbles can be discharged into the bathtub together with the discharge flow. In this way, even if dust or dust in the air adheres to the surface of the filter member due to the intake of air in the previous bubble generation operation, the dust and dust are The backflow prevention means can be automatically released toward the atmosphere by the advance / retreat operation, and it is possible to reliably prevent clogging in the filter member. For this reason, it is possible to surely avoid the occurrence of an inconvenient situation such as a reduction in the amount of bubbles generated due to the tendency of the filter member to become clogged, while periodic maintenance work for removing clogging can be eliminated. It becomes like this. As a result, it is possible to improve the function and quality of the bubble generating device and to achieve significant labor savings.

  In the present invention, the filter member can be formed of a breathable waterproof resin that allows gas to pass but not liquid. In this way, air in the external space can be permeated through the filter member formed of the breathable waterproof resin under the negative pressure of the discharge flow from the tip portion side, and air can be taken into the tip portion side. On the other hand, since water cannot permeate to the external space through the filter member, there is no possibility that water from the bathtub side leaks through the air intake portion. For this reason, it is not necessary to separately install the air intake pipe above the bathtub water level as in the prior art, and the installation work for that purpose can be omitted, and the construction cost can be greatly reduced.

  Further, in the present invention, the air intake part further includes a biasing member that biases the backflow prevention means, and the backflow prevention means is against the biasing member as the biasing member. When the filter member moves forward to the filter member side, a biasing force can be applied to the side where the backflow preventing means is restored to the original state (claim 3). By providing such an urging member, it becomes possible to reliably restore the backflow prevention means to the original state, and the backflow at the start of the steady operation after the start of the bubble generation operation or the start of the next bubble generation operation. The forward movement of the prevention means can be performed more reliably, and the action of claim 1 can be realized more reliably.

  As described above, according to the bubble generating device of the present invention, even if dust or dust adheres to the external space side of the filter member, the dust or dust is removed by the air flow from behind the filter member. It can be peeled off from the filter member and discharged to the outside space side. For this reason, even if dirt or dust in the air adheres to the surface of the filter member due to air intake in the previous bubble generation operation, the backflow prevention means is used every time the bubble generation operation is started. By the forward / backward movement of the filter, it can be automatically released toward the atmosphere, and the occurrence of clogging in the filter member can be surely prevented. Therefore, it is possible to surely avoid the occurrence of an inconvenient situation such as a reduction in the amount of bubbles generated due to the tendency of the filter member to become clogged, while eliminating the need for periodic maintenance work for clogging removal. Will be able to. As a result, the function and quality of the bubble generating device can be improved, and significant labor saving can be achieved.

  In particular, according to claim 2, the air in the external space can be taken in by receiving the negative pressure of the discharge flow from the tip portion side, while water cannot permeate into the external space through the filter member. Water leakage from the bathtub side can be reliably prevented through the section. For this reason, in addition to the above effects, the following effects can be obtained. That is, unlike the conventional case, it is not necessary to separately install the air intake pipe above the water level of the bathtub, so that the installation work itself can be omitted, and the construction cost can be greatly reduced. Become.

  Furthermore, according to the third aspect, by further including the urging member, the backflow prevention means can be reliably restored to the original state by the urging force. The forward movement of the backflow prevention means at the start of the bubble generation operation can be performed more reliably, and the effects of the present invention can be obtained more reliably.

It is explanatory drawing which shows the example of the bath system to which a bubble generator is applied. It is a perspective view of the circulation adapter for reheating circulation to which the bubble generating device is applied. It is AA sectional view explanatory drawing of FIG. 2 which concerns on embodiment. FIG. 4 is an enlarged explanatory view of the air intake part of FIG. 3. It is explanatory drawing which shows the operating principle of the reheating operation using the circulation adapter of FIG. FIG. 6 is a diagram corresponding to FIG. 5, illustrating an operation principle diagram of bubble generation operation using the circulation adapter of FIG. FIG. 7A is a diagram corresponding to FIG. 3 showing the state of the air intake section during the bubble generation operation, and FIG. 7B is the air intake when the internal pressure rises at the start of the bubble generation operation. FIG. 4 is a diagram corresponding to FIG. It is a relationship figure of time and internal pressure which show internal pressure change at the time of the start of bubble generation operation. It is the elements on larger scale of FIG.7 (b).

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

  The bath system shown in FIG. 1 includes a bathtub 1, a hot water heater 2 having a recirculation function for a bath, and a recirculation piping that connects the bathtub 1 and the hot water heater 2 to each other. 3 and a circulation adapter 4 with a built-in / attached bubble generating apparatus according to the 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 1, 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. Then, when the circulation pump 23 in the water heater 2 is operated, the bath water (hot water or water) in the bathtub 1 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 1 through the outgoing path 32 and the circulation adapter 4 is generated and circulated. When the combustion burner 22 is combusted during this circulation operation, the bath water returned from the bathtub 1 is heated to a predetermined temperature and retreated, and the combustion burner 22 remains in a non-combustion state. If it exists, only the circulation flow by bathtub water will arise.

  The circulation adapter 4 is a unit in which a front cover body 41 (see also FIG. 2) disposed on the inner side of the bathtub 1 and an adapter main body 42 disposed mainly on the outer side of the bathtub 1 are integrated and assembled. 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, and are formed on the rear end surface of the adapter main body 42. Is provided with an air intake 51.

  The front cover body 41 incorporates a switching valve mechanism 43 (to be described later) having a switching lever 431 for switching between the chasing operation mode and the bubble generation operation mode (bubble warm bath operation mode). A filter member 410 extending in a ring shape is attached. A front discharge port 411 through which circulating water containing bubbles is discharged or discharged is formed at the upper front position of the front cover body 41, while a switching lever 431 is formed from a half-moon shaped guide opening 412 at the lower front position. It protrudes in an arc shape so as to be able to reciprocate.

  FIG. 3 shows the circulation adapter 4 in which the bubble generating device 5 is incorporated as a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 shows an enlarged view of the main part of the bubble generating device 5. FIG. 5 or FIG. 6 shows a basic structure in which the detailed structure of the circulation adapter 4 is omitted.

  First, the schematic structure of the circulation adapter 4 will be described with reference mainly to FIG. 5 or FIG. The circulation adapter 4 draws the bathtub water from the bathtub 1 by the operation of the circulation pump 23 described above and flows it into the return path 31 and the circulation water (tub water) from the outgoing path 32 in the bathtub 1. A re-exhaust discharge flow path 45 that flows as it is, a bubble discharge flow path 46 that is a discharge flow path for discharging into the bathtub 1 in a state where air bubbles are entrained in the circulating water from the forward flow path 32, and the forward flow path 32. A switching valve mechanism 43 for switching between flowing the circulating water from the discharge side to the discharge flow path 45 (refreshing operation mode) and flowing to the bubble discharge flow path 46 (bubble generation operation mode). I have.

  As shown by an arrow R in FIG. 5 or FIG. 6, the suction channel 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. 5, the follow-up discharge channel 45 guides the circulating water from the forward connection port 422 to the branch 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 as to be discharged into the bathtub 1 from a reheating outlet 453 that opens to the outer peripheral surface of the lower region.

  As indicated by an arrow B in FIG. 6, the bubble discharge channel 46 guides the circulating water from the forward connection port 422 to the branch channel 461 via the branch chamber 451, and then enters the swirl chamber 463 from the ejection hole 462. It spouts to create a swirl flow in the swirl chamber 463 and entrains air, and extends so as to discharge the circulating water together with the entrained bubbles toward the front of the bathtub 1 through the bubble discharge port 464 and the front discharge port 411. . The swirl chamber 463 has an inner peripheral surface formed in a cylindrical shape, and the ejection hole 462 is opened so as to eject the circulating water from the branch chamber in a tangential direction to the swirl chamber 463. The swirling flow toward the bubble discharge port 464 is generated in the swirl chamber 463 due to the ejection of the circulating water from the spout hole 462, and the centrifugal force acts on the center portion to be a negative pressure lower than the atmospheric pressure. The air is taken in by the negative pressure of the part acting on the air intake part 51 (to be described later) of the bubble generating device 5, and as a result of this air being entrained in the swirling flow from the tip nozzle part 52, the minute bubbles are mixed Circulated water is discharged into the bathtub 1. When the bubble generation operation is started by switching to such a bubble generation operation mode, the internal pressure of the swirl chamber 463 (acting on the tip nozzle portion 52 is affected by the ejection from the ejection hole 462 to the swirl chamber 463 as described later. The internal pressure) instantaneously rises above the atmospheric pressure, and then drops to a negative pressure with the generation of the swirling flow and the discharge into the bathtub 1.

  The switching valve mechanism 43 includes a switching shaft 432 having a switching lever 431 fixed to the front end and disposed so as to penetrate the diversion chamber 451, and a first switching valve 433 and a second switching valve 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 433 interposed therebetween. The switching valve mechanism 43 can automatically switch between the reheating 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 remediated 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. 5). 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. 6). Also, the switching operation can be switched between the reheating operation mode and the bubble generation operation mode by moving the switching shaft 432 forward and backward by a switching operation of the switching lever 431.

  Next, the bubble generating device 5 will be described. As shown in FIG. 3, an air intake 51 for taking in air from the outside, and a tip portion for ejecting the air taken in from the air intake 51 to the swirl chamber 463, A tip nozzle portion 52. The tip nozzle portion 52 has an orifice structure in which an inner hole is formed with a predetermined minute diameter (for example, a diameter of 0.6 mm), and has a hemispherical tip.

  As shown in detail in FIG. 4, the air intake portion 51 is located at a passage position on the side of the cylindrical case 53 and the passage 531 in the case 53, which is the intake front end opening 532 that opens to the external space side. On the other hand, the transmission wall 54 as a filter member formed of a porous material and interposed so as to block the passage, and the passage position on the side of the tip nozzle portion 52 (see FIG. 3) from the swirl chamber 463 to the external space A check valve portion 55 interposed to prevent the back flow of water to the water, a piston member 56 which incorporates the check valve portion 55 and can advance and retreat through the passage 531, and the piston member 56 through the transmission wall body 54. On the other hand, a biasing member 57 that biases the spring toward the tip nozzle 52 is provided. The check valve portion 55 and the piston member 56 constitute backflow prevention means.

  Each of these components is assembled in the case 53 of the air intake 51 as follows. That is, in a state where the piston body 56 including the check valve portion 55 is inserted from the tip opening 532 side toward the bottom wall 533 on the base end side in the case 53 and the biasing member 57 is interposed therebetween. The fixing member 58 is fitted inside, and the transmissive wall body 54 is housed in the fixing member 58, and the lid member 59 is screwed to sandwich the transmissive wall body 54 and fix it. Small holes 534, 561, and 581 are formed through the bottom wall 533, the piston member 56, and the fixing member 58, respectively, and these small holes 534, 561, and 581 correspond to the flow opening cross-sectional area of the passage 531 according to the intake air amount. Shaped to adjust things. The fixing member 58 is sealed by, for example, an O-ring 582, and the lid member 59 is opened between the surrounding screw ring 591 and the central tightening operation portion 592 to form the tip opening 532. And an inflow hole 593.

  The permeable wall body 54 is formed of a porous material having a large number of micro-diameter holes, and the gas flows in the upstream and downstream direction of the passage 531 (the air flow direction; the tip opening 532 side is the upstream side, and the bottom wall 533 side is the downstream side). The permeating liquid is a wall that does not allow permeation, and is formed of, for example, a breathable waterproof resin. As such a breathable waterproof resin, for example, the following may be adopted. That is, injection molding is performed using a compound of water-soluble powder and a thermoplastic resin (for example, PBT: polybutylene terephthalate), and water treatment is performed after the molding to elute the water-soluble powder. For example, a continuous porous breathable waterproof resin is obtained by continuously communicating through a minute diameter hole (for example, a hole having a diameter of 5 to 10 μm) with a space of 20 to 50 μm. That is, a continuous porous resin having fine pores that allow gas molecules to permeate but not liquid water molecules to permeate is used. Specific examples of such a breathable waterproof resin material include “microvent” (product name of Taisei Plus Co., Ltd.).

The permeable wall body 54 is made of the above-mentioned breathable waterproof resin material, and is sized so that the intake air amount is suitable for the bubble generation operation mode based on the permeable air amount determined by the permeable surface area and the internal and external differential pressures. . For example, if the breathable waterproof resin of the above-mentioned material example is used as the permeable wall body 54 and formed to have a diameter of 12 mm and a thickness of 3 mm, the amount of intake air permeated when the differential pressure is a negative pressure of −26.1 kpa is 0.1 L. / Min, and an appropriate amount of intake air can be transmitted.
When the valve body 551 is in a mode other than the bubble generation operation mode, the check valve portion 55 receives water pressure from the bathtub 1 (see FIG. 3) side, closely contacts the small hole 561 side, and blocks the small hole 561. On the other hand, in the bubble operation mode, the air is deflected by receiving a negative pressure based on the swirling flow in the swirl chamber 463 (see FIG. 3 and the like), and thereby air is moved away from the small hole 561 to the swirl chamber 463 side from the outer peripheral gap. Inflow is possible (see FIG. 7A).

  The piston member 56 slides in a state where the outer diameter is set to be slightly smaller than the inner diameter of the passage 531, for example, and is sealed between the inner peripheral surface of the passage 531 by a seal member 562 attached around the piston member 56. The inside of 531 can be advanced and retracted. As the seal member 562, for example, an O-ring or the like may be used in addition to a U-ring (U packing) as illustrated. The piston member 56 receives a spring biasing force from the biasing member 57 interposed between the piston member 56 and the fixed member 58 on the side pressed against the bottom wall 533. As a result, at the start of the bubble generation operation, it is always kept pressed against the bottom wall 533 except when it is instantaneously moved toward the fixing member 58 as described later. .

  The internal pressure fluctuation in the swirl chamber 463 during the bubble generation operation from the start of the bubble generation operation and the state change of the air intake portion 51 accompanying this will be described in detail.

  At the start of the bubble generation operation, the circulating flow is ejected into the swirl chamber 463 through the ejection hole 462 based on the operation of the circulation pump 23 in the state switched to the bubble generation operation mode by the switching valve mechanism 43 as described above. Then, since the circulating flow flows into the swirl chamber 463 that has been in a staying state until then, the internal pressure (internal pressure) acting on the tip nozzle 52 facing the swirl chamber 463 temporarily and rapidly increases. Therefore, the pressure changes to the positive pressure side higher than the atmospheric pressure (see T portion in FIG. 8). The degree of such an increase in internal pressure is determined in accordance with the level of water in the bathtub 1 that also serves as back pressure, in addition to the output of the circulating flow into the swirl chamber 463 and the discharge pressure of the circulation pump 23. become. For example, if the water level is 50 cm, the internal pressure rises to a value corresponding to the water head. On the other hand, the circulating flow that has flowed into the swirl chamber 463 generates a swirl flow in the swirl chamber 463, and the centrifugal force acts along with the swirl flow, so that the internal pressure immediately drops to the negative pressure side lower than the atmospheric pressure. Will change.

  As the internal pressure fluctuates, first, in the air intake portion 51, a temporary and sudden rise in internal pressure at the start starts from the tip nozzle 52 to the check valve portion 55 and the piston member 56 (see FIG. 7B). The piston member 56 moves instantaneously toward the fixing member 58 against the urging member 57, that is, toward the transmission wall body 54 in a state where the small hole 561 is closed by the check valve portion 55. Thereafter, the urging member 57 receives a spring urging force as the internal pressure is lowered, and the piston member 56 is restored to the original state (the state shown in FIG. 4) pressed against the bottom wall 533 together with the check valve portion 55. As the piston member 56 is pushed by the increase in internal pressure and instantaneously moves toward the transmission wall body 54, the transmission wall body 54 has a tip opening 532 from the back in the direction opposite to that during intake (air intake). The exhaust flow of air to the side of the air acts, passes through the permeable wall body 54 and is discharged to the outside. At this time, with respect to the surface facing the atmosphere side of the transmission wall body 54 (the surface on the side of the tip opening 532), a kind of dust and dust M (see FIG. 9) in the atmosphere is generated due to the intake operation in the previous bubble generation operation. Even if it adheres, the dust and dust M can be discharged to the atmosphere side by the exhaust flow. When the piston member 56 is restored to the original state as the internal pressure drops, the valve body 551 (see FIG. 7A) of the check valve portion 55 is bent by receiving the negative pressure acting from the tip nozzle 52. Thus, the air that has left the small hole 561 and has been sucked in from the tip opening 532 can flow into the swirl chamber 463 through the small holes 561 and 534.

  In the case of the above embodiment, since the permeable wall 54 interposed so as to block the passage 531 of the air intake 51 is formed of a breathable waterproof resin that allows air to pass but does not allow water to pass, Even if the generator 5 is attached to the circulation adapter 4 and the opening of the air intake 51 is located below the water level of the bathtub water stored in the bathtub 2, there is no risk of water leakage, Since the generator 5 is built in and attached to the circulation adapter 4, it is installed on the wall outside the bathroom above the bath water level as in the case of a conventional air intake pipe. Can be omitted. Further, with respect to avoiding the possibility of occurrence of water leakage, it can be further ensured by providing a check valve portion 55 in addition to the transmission wall body 54 described above.

  Furthermore, even if dust or dust M in the atmosphere adheres to the surface of the transmission wall 54 due to the intake operation on the surface of the transmission wall body 54, the above-mentioned piston is generated every time the bubble generation operation is started. The member 56 can be automatically released toward the atmosphere by the advance / retreat operation of the member 56, so that the occurrence of clogging can be surely prevented. For this reason, it is possible to surely avoid the occurrence of an inconvenient situation such as a reduction in the amount of bubbles generated due to the tendency to clogging, while eliminating the need for periodic maintenance work to remove clogging. Will be able to. As a result, the function and quality of the bubble generating device can be improved, and significant labor saving can be achieved.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the said embodiment, you may comprise a permeable wall body using breathable waterproof resin other than what was illustrated as a breathable waterproof resin in order to form the permeable wall body 54. FIG. In that case, a size capable of realizing a desired intake air amount may be selected and determined based on the relationship between the internal and external differential pressure and the permeable intake air amount at that time.

  A filter member may be further provided on the side of the distal opening 532 of the transmission wall body 54 of the above embodiment. As a result, the occurrence of clogging of the minute diameter holes in the transmission wall body 54 can be reliably prevented and suppressed, and the life and durability of the transmission wall body 54 can be extended, while being attached to the filter member. The collected dust and dust can be released to the atmosphere each time the bubble generating operation is started by the advance / retreat operation of the piston member 56.

  Temporary increase in internal pressure of the swirl chamber 463 in order to further strengthen the exhaust flow for releasing dust and dust adhering to the transmission wall 54 and the filter member attached to the transmission wall 54 to the atmosphere side. It is sufficient to increase the degree. As a means for this, for example, the opening / closing valve 6 (FIG. 3) may be provided at the outlet of the swirl chamber 463 on the bathtub 1 side. Then, at the start of the bubble generation operation, it is sufficient to switch from the closed state to the open state with a time lag so that the jet flow containing the bubbles is jetted into the bathtub 1. That is, by delaying the switching to the open state, the degree of increase in internal pressure in the swirl chamber 463 can be increased as the jet flow from the jet hole 462 flows. It is also possible to employ a method of using a rubber bowl-like pushing means from the bathtub 1 side toward the swirl chamber 463 to positively apply a pressing force using water as a medium to artificially increase the internal pressure. .

  In the above embodiment, the present invention is applied to a bubble generating device that takes in air by generating a swirling flow in the swirling chamber 463 to generate a negative pressure. On the other hand, with the tip nozzle that is the tip part facing, the internal pressure increases with the start of supply of the discharge flow to the discharge flow path, and the backflow prevention means is moved forward to the filter side in response to the increase in internal pressure. May be.

  Moreover, in the said embodiment, although the example which utilized the circulation flow of the recirculation circulation path 3 was shown as a hot water discharge flow which carries the bubble suck | inhaled by the negative pressure and discharges in a bathtub, it is not restricted to a circulation flow For example, it is also possible to use a water flow that is simply supplied to the bathtub and discharged into the bathtub just by draining the overflow from the bathtub, that is, a so-called pouring hot water supply water flow.

In the above embodiment, the air inlet 51 is formed by assembling the permeable wall body 54 after being formed separately from other constituent members by using a breathable waterproof resin. However, the present invention is not limited to this. Other structural members such as the case 53 and the transmission wall 54 may be integrally molded by a two-color molding method.
Furthermore, in the said embodiment, although the example in which the circulation adapter 4 was installed in the wall surface of the one side of the bathtub 1 was shown, not only this but the circulation adapter 4 to which the bubble generation apparatus 5 was attached is made into the bottom side of the bathtub 1. It may be installed on the wall surface (bottom wall surface), and the discharge flow containing bubbles may be discharged upward with respect to the bathtub water.

DESCRIPTION OF SYMBOLS 1 Bath 5 Bubble generator 46 Bubble discharge flow path (discharge flow path)
51 Air intake part 52 Tip nozzle (tip part)
54 Transmission wall (filter member)
55 Check valve (backflow prevention means)
56 Piston member (backflow prevention means)
57 Energizing member 531 Passage

Claims (3)

A bubble generating device arranged such that a tip portion opens from a wall surface of the bathtub to a discharge channel of hot water discharged into the bathtub, and air is taken in from the tip portion by a discharge flow flowing through the discharge channel. Because
An air intake portion that communicates with the distal end portion and takes in air from the external space, and a filter member disposed on the external space side, and is disposed closer to the distal end portion side than the filter member and from the external space. Constructed with a backflow prevention means for preventing the passage of water to the outside space side while allowing the taken-in air to pass through,
The bubble generating device, wherein the backflow prevention means is disposed so as to be able to advance and retreat with respect to a passage between the filter member side and the tip portion side. The bubble generating device according to claim 1,
The bubble generating device, wherein the filter member is formed of a breathable waterproof resin that allows gas to pass but does not allow liquid to pass. The bubble generator according to claim 1 or 2,
The air intake portion is further configured to include a biasing member that biases the backflow prevention means,
The urging member applies an urging force to the side where the backflow prevention means is restored to the original state when the backflow prevention means advances to the filter member side against the urging member. An air bubble generator configured.

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