JP2005058924A - Bubble generating nozzle, and bubble-generating apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bubble-generating nozzle for a bubble-generating apparatus which nozzle can enhance the performance of the bubble-generating apparatus, and the bubble-generating apparatus. <P>SOLUTION: The bubble-generating nozzle comprises a turning flow forming section 7 having a plurality of through holes 7a arranged symmetrically or circularly, a turning flow circulation section 9 forming a passage 3 for a gas-containing liquid in its interior, a bubble-generating section 11 forming the passage 3 for the gas-containing liquid in its interior and having a through hole 11b formed in the side wall of the passage 3, and a tubular outer cylinder section 13 installed concentrically with the bubble-generating section 11 and covering the section 11. The pluraity of through holes 7a of the turning flow forming section 7 are inclined in a direction along the circumference of the turning flow forming section 7 toward the direction to form a turning flow of the gas-containing liquid flowing out of the through holes 7a. The bubble-generating section 11 has at least one beam member 11a installed in a direction crossing the flowing direction of the gas-containing liquid in the passage 3 of the section 11. The through hole 11b formed in the side wall of the passage 3 of the section 11 is formed downstream of the beam member 11a in respect of the flow of the gas-containing liquid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bubble generation nozzle and a bubble generation device including the nozzle.

  In a bubble generating device, generally, a liquid in which air is dissolved by being pressurized to a high pressure by a pressurizing means is passed through a flow path formed in an orifice shape, and then discharged into a tank or the like containing the liquid, or venturi. The liquid passes through a discharge part having an orifice-shaped flow path or a venturi-like jet outlet by a method such as jetting into a tank containing liquid from a discharge part having a jet outlet. Bubbles are formed by sudden pressure reduction.

By the way, the bubble generating device is used by being incorporated in various devices utilizing the action of bubbles, such as a bathtub, an aeration tank, and a water treatment device. However, in order to obtain the action of bubbles efficiently, the bubbles are contained in the tank. It needs to be well distributed in the contained liquid. In order to make the bubbles sufficiently spread in the liquid contained in the tank, it is necessary to increase the residence time in the liquid, and in order to increase the residence time in the liquid, it is as fine as possible. It is necessary to generate a large amount of bubbles and to generate a larger amount of bubbles.
However, it is difficult to generate fine bubbles such as several μm to several tens of μm only by a pressure reducing action such as a nozzle having a flow path formed in an orifice shape or a venturi-like jet outlet. It is also difficult to increase the production amount. Therefore, in order to generate finer bubbles and increase the amount of bubbles generated, the bubble generating device has a complicated configuration such as a configuration including a mechanical decompression unit or a configuration including a plurality of decompression chambers and orifices. ing. Therefore, there has been a demand for a bubble generating device that can make the bubbles sufficiently spread in the liquid contained in the tank with a simple configuration.
On the other hand, liquid feeding means to the liquid flow path through which the liquid flows, a gas flow path for supplying gas into the liquid in the liquid flow path, and a valve provided in the gas flow path for controlling the flow of the gas A pressure detecting means for detecting the pressure in the portion downstream of the liquid flow with respect to the liquid flow with respect to the liquid flow means, and a nozzle provided at the outlet side end of the liquid flow path. There has been proposed a bubble generating device configured to open and close a valve according to a pressure detected by a detecting means (see, for example, Patent Document 1).

JP 2003-210958 A (page 3-4, FIG. 1)

  By the way, in the bubble generating device proposed in Patent Document 1, the configuration of the portion other than the nozzle can generate finer bubbles and increase the amount of generated bubbles, thereby improving the performance of the bubble generating device. It is a thing. Therefore, if the nozzle can generate finer bubbles and increase the amount of generated bubbles, the performance of the bubble generating device can be further improved.

  An object of the present invention is to improve the performance of a bubble generating device using a nozzle.

  The bubble generating nozzle of the present invention is connected to a pipe line through which a liquid mixed with gas flows, and the inside is a cylindrical connecting part that becomes a flow path of the liquid mixed with gas. A swivel in which a plurality of through holes arranged in a row or symmetrically or circularly are formed in a columnar or disk shape formed from one end surface to the other end surface, and one opening of the plurality of through holes communicates with the flow path of the connecting portion The flow forming part and a cylindrical shape continuous to the swirl flow forming part, and the inside becomes a liquid flow path mixed with gas, and the other openings of the plurality of through holes of the swirl flow forming part communicate with this flow path. A swirl flow part that is continuous with the swirl flow part, and the inside is a liquid flow channel mixed with gas, and the end of the side that is not continuous with the swirl flow part is closed. A bubble generating part having a through hole formed in the side wall of the flow path, and provided coaxially with the bubble generating part And a cylindrical shape covering the bubble generating portion, and an outer cylindrical portion having an open end on the side opposite to the swirl flow portion, and the plurality of through holes of the swirl flow formation portion are arranged around the periphery of the swirl flow formation portion. In a direction along the same direction, forming a swirling flow of the liquid mixed with the gas flowing out from the plurality of through-holes. It has at least one beam-like member installed in the direction crossing the flow direction of the mixed liquid, and the through-hole formed in the side wall of the flow path of the bubble generating part contains gas more than at least the beam-like member The above-described problem is solved by adopting a configuration provided on the downstream side with respect to the flow of the liquid.

With such a configuration, the liquid mixed with the gas flowing into the connecting portion becomes a swirling flow by passing through the through hole of the swirling flow forming portion, and this swirling flow is a beam-like shape provided in the bubble generating portion. It will collide with the member. In such a process, the gas and the liquid are mixed, and relatively large bubbles in the liquid are crushed by the collision with the beam-shaped member. Then, in a state where relatively large bubbles are crushed and mixing of the gas and the liquid is promoted, pressure and pressure are reduced by being ejected from a through-hole formed in the side wall of the flow path of the bubble generation unit. The liquid containing the bubbles ejected from the through-hole formed in the side wall of the flow path of the bubble generation unit collides with the inner surface of the outer cylinder part, and thus the finer effect. Bubbles can be generated and the amount of bubbles generated can be increased. Therefore, the performance of the bubble generating device can be improved by the nozzle.
In addition, if the beam-like member provided in the bubble generating part is a cylindrical member, the mixing ability and the ability to crush relatively large bubbles in the liquid can be improved. Can be improved more.

  Furthermore, a plurality of beam-shaped members are provided in the bubble generating portion at different positions in the flow path of the bubble generating portion, and the extending directions of the plurality of beam-shaped members are at an angle of 60 degrees. It is set as the structure provided in the state. With such a configuration, the mixing ability, the ability to crush relatively large bubbles in the liquid, and the like can be further improved, and the ability of the nozzle to generate bubbles can be further improved.

  The bubble generating part is provided with a plurality of through holes formed in the side wall of the flow path, and the plurality of through holes formed in the same circumferential position of the cylindrical bubble generating part among the plurality of through holes. The holes are configured to be provided at an angle of 60 degrees, 120 degrees, or 180 degrees. With such a configuration, the bubble generation capability of the nozzle can be further improved.

Further, the swirl flow portion is configured such that the width of the flow path of the swirl flow portion becomes narrower from the swirl flow forming portion toward the bubble generating portion. With such a configuration, the pressure in the flow path of the bubble generating nozzle can be further increased, and the pressure reducing action caused by being ejected from the through-hole formed in the side wall of the flow path of the bubble generating portion can be further increased. Since it can raise, the bubble generation capability of a nozzle can further be improved.
Furthermore, it is cylindrical, and one end surface can insert an outer cylinder part in a center part, the other end surface is obstruct | occluded, and the outer cylinder part of one end surface can be inserted in the peripheral part of the center part which can be inserted. Has a cover member in which an opening is formed. With this configuration, after the liquid containing bubbles discharged from the outer cylinder collides with the closed end surface of the cover member, the outer cylinder portion on the end surface on which the outer cylinder portion can be inserted can be inserted. The ability of the nozzle to generate bubbles can be further improved by going outside through an opening formed in the peripheral portion of the central portion.
Further, the bubble generating device of the present invention supplies a gas into the liquid in communication with the liquid flow path through which the liquid flows, the liquid feeding means provided in the liquid flow path, and the liquid flow path. A gas flow path and a nozzle provided at the outlet side end of the liquid flow path are provided, and the nozzle is any one of the bubble generating nozzles described above.
Further, the bubble generating device of the present invention includes a liquid channel through which a liquid flows, a liquid feeding means provided in the liquid channel, and a gas that communicates with the liquid channel and supplies gas into the liquid. A flow path, a valve provided in the gas flow path for controlling the flow of the gas in the gas flow path, and a pressure in a portion downstream of the liquid flow path with respect to the liquid flow means. And a nozzle provided at the outlet side end of the liquid flow path, and the valve opens when the pressure detected by the pressure detection means reaches the first set pressure, and the pressure detection means When the pressure detected in (2) becomes the second set pressure lower than the first set pressure, the nozzle is closed and the nozzle is the bubble generating nozzle described in any of the above. With these configurations, the performance of the bubble generating device can be improved.

  According to the present invention, the performance of the bubble generating device can be improved by the nozzle.

(First embodiment)
Hereinafter, a first embodiment of a bubble generation nozzle and a bubble generation device to which the present invention is applied will be described with reference to FIGS. 1 to 6. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a bubble generating nozzle to which the present invention is applied in a state where a cover member is disassembled. FIG. 2 is a diagram showing a schematic configuration of the connecting portion and the swirling flow forming portion, where (a) is a view seen from the swirling flow forming portion side, and (b) is a view from IIb-IIb line of (a). An arrow sectional view and (c) are the figures seen from the connection part side. FIG. 3 is a diagram showing a schematic configuration of the swirling flow part and the bubble generation part, (a) is a view seen from the bubble generation part side, (b) is a view from the IIIb-IIIb line of (a). An arrow sectional drawing, (c) is the figure seen from the swirl circulation flow part side, (d) is an arrow sectional drawing from the IIId-IIId line | wire of (b). 4A and 4B are diagrams showing a schematic configuration of the outer cylinder portion, where FIG. 4A is a view seen from the discharge port side, FIG. 4B is a cross-sectional view taken along line IVb-IVb in FIG. c) is the figure seen from the connection part side with a swirl circulation flow part. 5A and 5B are diagrams illustrating a schematic configuration of a cover member, in which FIG. 5A is a view seen from the closed end side, FIG. 5B is a cross-sectional view taken along line Vb-Vb in FIG. c) is a view as seen from the outer tube portion insertion side end portion side. FIG. 6 is a block diagram showing a schematic configuration of a bubble generating apparatus to which the present invention is applied.

  In this embodiment, the bubble generating device is described as an example attached to a bathtub. However, the bubble generating device of the present invention is a live fish tank, aquaculture, hydroponics, freshwater or seawater purification treatment, sludge It can be used for various applications that use fine bubbles, such as floatation treatment, aerobic bacteria treatment, and cleaning applications. In addition, bubble generation equipment that is attached to existing bathtubs, treatment tanks, water tanks, etc. Various configurations such as devices can be made.

  As shown in FIG. 1, the bubble generating nozzle 1 according to the present embodiment includes a cylindrical connecting part 5 having a flow path 3 inside, and a columnar swirl flow formed integrally with the connecting part 5 in this embodiment. Forming part 7, a cylindrical swirl flow part 9 in which a flow path 3 whose diameter gradually decreases is formed inside, and in this embodiment, is formed integrally with swirl flow part 9, and from swirl flow part 9 The cylindrical bubble generating part 11 having a small diameter and the cylindrical outer cylinder part 13 provided coaxially with the bubble generating part 11 and covering the bubble generating part 11 are also included. Further, the bubble generating nozzle 1 of the present embodiment includes a cylindrical cover member 15 formed so that the outer cylinder portion 13 can be inserted.

  As shown in FIGS. 1 and 2, the connecting portion 5 has a screw 5 a that can be screwed with a screw cut in a pipe line (not shown) that connects the bubble generating nozzle 1. The cylindrical swirl flow forming portion 7 formed integrally with the connecting portion 5 has two through holes 7a penetrating from one end surface of the columnar swirl flow forming portion 7 to the other end surface at symmetrical positions. Has been. The through-hole 7a is one end surface of the cylindrical swirl flow forming portion 7 in a state inclined with respect to the extending direction of the central axis of the cylindrical swirl flow forming portion 7 at an angle of, for example, about 5 degrees to 6 degrees. To the other end face. In addition, the two through holes 7a are formed in a state in which they are inclined in the same direction along the circumference of the cylindrical swirl flow forming portion 7. A screw 7 b is cut on the outer surface of the swirl flow forming portion 7.

  As shown in FIGS. 1 and 3, the swirl flow portion 9 has the same outer shape, but is formed in a cylindrical shape whose inner diameter becomes narrower in three stages from one end side toward the other end side. In addition, a screw 9 a corresponding to the screw 7 b cut on the outer surface of the circulation forming portion 7 is cut on the inner surface of the portion having the largest diameter. Therefore, by screwing the screw 7b cut on the outer surface of the swirl flow forming portion 7 with the screw 9a cut on the inner surface of the swirl flow portion 9, as shown in FIG. The swirl flow forming portion 7 is fitted and fixed in a portion having a large diameter. The middle diameter portion and the smallest diameter portion of the swirl flow portion 9 are the flow path 3. Moreover, as shown in FIG.1 and FIG.3, the part with the largest diameter of the swirling flow part 9 and the part of an intermediate diameter is connected in the taper shape. A portion having an intermediate diameter and a portion having the smallest diameter in the swirl flow portion 9 are also connected in a tapered shape. Further, a screw 9b is cut on an outer surface of the swirling flow portion 9 corresponding to a portion having the smallest diameter from a part of the middle diameter portion.

  The bubble generating part 11 is formed coaxially with the swirl flow part 9 and has a cylindrical shape whose outer diameter is narrower than that of the swirl flow part 9. The flow path 3 in the bubble generation part 11 is formed with the same diameter as the part with the smallest diameter of the swirl flow part 9. And the edge part on the opposite side to the swirl flow part 9 of the bubble generation part 11 is obstruct | occluded. In addition, the bubble generation unit 11 is provided with a columnar beam-shaped member 11 a and a through hole 11 b that penetrates the side wall of the bubble generation unit 11. As shown in FIG. 3D, the beam-shaped member 11a is formed between two holes having the same inner diameter as the outer shape of the columnar beam-shaped member 11a, which are formed at opposite positions on the side wall of the bubble generating unit 11. The bubble generating unit 11 is attached by inserting a columnar member. Therefore, the extending direction of the beam-shaped member 11a intersects the extending direction of the flow path 3 in the bubble generating unit 11 at a right angle. In addition, the beam-shaped member should just be provided in the state which cross | intersects the extension direction of the flow path in a bubble generation part, and can be formed by various methods.

  In this embodiment, as shown in FIGS. 1 and 3, the beam-shaped member 11 a is provided at two different positions of the bubble generating unit 11, and an angle θ formed by the extending direction of the two beam-shaped members 11 a. Is 60 degrees as shown in FIG. Furthermore, in this embodiment, as shown in FIG.1 and FIG.3, the through-hole 11b is provided in two steps | paragraphs in the different positions of the bubble generation part 11, and is the same of each step, ie, the cylindrical bubble generation part 11. At the circumferential position, two through holes 11b are provided at positions opposed to the side wall of the bubble generating unit 11. Therefore, in this embodiment, four through holes 11b are provided. Moreover, in this embodiment, the beam-shaped member 11a and the through-hole 11b are alternately provided in order of the beam-shaped member 11a and the through-hole 11b from the swirl flow part 9 side.

  As shown in FIGS. 1 and 4, the outer cylinder portion 13 is formed of a cylindrical member having both end faces opened, and one end portion inner surface is provided with a screw 9 b cut on the outer surface of the swirling flow portion 9. The corresponding screw 13a is cut. And the outer cylinder part 13 covered the bubble generation part 11 coaxially with the bubble generation part 11 by screwing together the screw 13a of the inner surface of the outer cylinder part 13, and the screw 9b of the outer surface of the swirl flow part 9. Attached to the state. In addition, the outer cylinder portion 13 has a length in which the opening 13b at the other end projects beyond the closed end portion of the bubble generating portion 11, and the closed end portion of the bubble generating portion 11 is It is located in the tube part 13.

The cover member 15 has a large-diameter cylindrical main body 15a closed on one end side, and a small one for inserting the outer cylinder portion 13 provided on the other end side of the main body 15a coaxially with the main body 15a. It is formed by a cylindrical insertion portion 15b having a diameter. The insertion portion 15b of the cover member 15 is provided at the central portion of the end portion of the main body 15a so as to protrude from the end portion, and a bolt (not shown) is screwed into the side wall so as to be inserted. A nut 15 c for fixing the member 15 to the outer cylinder portion 13 is attached. An arcuate opening 15d that surrounds the insertion portion 15b is provided on the end surface of the main body 15a of the cover member 15 where the insertion portion 15b is provided, at an opposing position around the insertion portion 15b.
The cover member 15 is fixed to the outer cylinder portion 13 by inserting the outer cylinder portion 13 into the insertion portion 15b and pressing the tip of a bolt (not shown) against the outer surface of the outer cylinder portion 13. At this time, the cover member 15 is attached to the outer cylinder portion 13 so that the opening 13b of the outer cylinder portion 13 does not contact the wall surface of the closed end of the main body 15a of the cover member 15. The interval between the wall surface of the closed end portion of the main body 15a of the cover member 15 and the opening 13b of the outer cylinder portion 13 is appropriately adjusted according to the state of generation of bubbles.
As shown in FIG. 6, the bubble generating device 16 to which the bubble generating nozzle 1 (hereinafter referred to as the nozzle 1) having such a configuration is attached includes a circulation pipe 17 serving as a liquid flow path, and one end of the circulation pipe 17. The inflow part 19 provided in the circulation line 17 and the inflow part 19 of the circulation line 17 are the nozzle 1 provided on the other end side, and the circulation line 17 is provided in the part of the circulation line 17 between the inflow part 19 and the nozzle 1. A check valve 21, an inflow flow rate adjustment valve 23, a pump 25 serving as a liquid feeding means, a pressure gauge 27, a discharge flow rate adjustment valve 29, and a circulation line 17 are sequentially provided from the upstream side with respect to the flow of hot water inside. Control of the operation and operation of the gas flow path 31 serving as a gas flow path communicating with the portion between the inflow flow rate control valve 23 and the pump 25, the gas flow rate control valve 33 provided in the gas flow path 31, and the bubble generating device It is comprised with the operation panel 35 etc. which become a control means to perform.
In the present embodiment, the circulation pipe 17 is a pipe having a relatively small diameter such as an inner diameter of about 10 mm. Accordingly, as shown in FIG. 1, the nozzle 1 also corresponds to a pipe having a relatively thin diameter such as an inner diameter of about 10 mm. Therefore, the connecting portion 5 is formed to have a diameter corresponding to the pipe having an inner diameter of about 10 mm. The screw 5a formed on the inner surface of the connecting portion is not shown, but corresponds to the screw formed on the outer surface of the end portion of the pipe having an inner diameter of about 10 mm. Further, the intermediate diameter portion that becomes the flow path 3 of the swirl flow portion 9 has an inner diameter of about 10 mm, for example, about 8 mm, and the flow passage 3 of the swirl flow portion 9. The thinnest diameter portion and the flow path 3 of the bubble generating portion 11 are formed with an inner diameter of about 3 mm, for example. Further, the outer cylinder portion 13 has an inner diameter of about 14 mm, for example, while the inner diameter of the circulation pipe 17 is about 10 mm.

  As shown in FIG. 6, the inflow portion 19 is attached to the bottom of the bathtub 37, for example, and the nozzle 1 is attached to the inner side wall of the bathtub 37 in a state of discharging hot water from the vicinity of the bottom surface in the bathtub 37. Therefore, hot water 39 that has flowed in from the inflow portion 19 provided at the inlet side end of the circulation pipe 17 is discharged into the bathtub 37 from the nozzle 1 provided at the outlet side end of the circulation channel 17. In this way, the circulation pipe line 17 becomes a flow path for circulating the hot water 39 accommodated in the bathtub 37.

  The inflow flow rate adjustment valve 23 is a valve for adjusting the flow rate of the hot water 37 flowing into the pump 25. As the pump 25, pumps having various configurations can be used as long as the required discharge flow rate, pressure, lift, and the like can be ensured and liquid can be fed even in a gas mixture. As the pump 25 of the present embodiment, hot water 37 is supplied into the circulation line 17 at a desired flow rate, for example, 6 L / min. A pump that can be passed at a flow rate of about the above, and that has the ability to pressurize the portion of the circulation line 17 downstream of the pump 25 to a pressure higher than a desired pressure, for example, about 0.2 MPa or higher. Is used. Such a pump 25 is electrically connected to a circuit or the like serving as a control means in the operation panel 35 via a wiring 41.

  The pressure gauge 27 is for visually confirming the pressure in the portion of the circulation pipe 17 on the downstream side of the pump 25. The discharge flow rate adjustment valve 29 is a valve for adjusting the discharge flow rate of the hot water 37 from the nozzle 1 and adjusts the maximum pressure in the downstream portion of the circulation line 17 from the pump 25. For example, the maximum pressure is adjusted to about 0.6 MPa. One end of the gas pipe 31 is open to the air, and the other end is connected to a portion of the circulation pipe 17 between the inflow rate adjusting valve 23 and the pump 25. A gas flow rate adjustment valve 33 provided in the gas pipe 31 adjusts the amount of gas mixed into the hot water 37 flowing through the circulation pipe 17. The operation panel 35 contains operation switches and a circuit that serves as a control means, and controls the start and stop of the pump 25 and the like.

The operation of the bubble generating apparatus having such a configuration and the features of the present invention will be described. In the bubble generating device 16 of the present embodiment, as shown in FIG. 6, when the operation start command switch in the operation panel 35 is turned on, the pump 25 starts to drive, and the hot water 39 in the bathtub 37 circulates from the inflow portion 19. The hot water 39 is discharged from the nozzle 1 into the bathtub 37 and the hot water 39 starts to circulate. Here, when the gas flow rate adjustment valve 33 is opened to the set opening, air is sucked into the circulation pipe 17 from the open end of the gas pipe 31 through the gas pipe 31 and flows through the circulation pipe 17. Air is mixed into the hot water 39 to be used.
As shown in FIG. 1, when the hot water 39 mixed with air flows into the nozzle 1, the hot water 39 is increased in thickness by driving the pump 25, and flows through a through hole 7 a provided to be inclined in the swirl flow forming portion 7. To do. As a result, a swirling flow of hot water 39 mixed with air is formed in the flow path 3 of the swirling flow portion 7 through the through hole 7a of the swirling flow forming portion 7. The swirling flow of the hot water 39 mixed with air flows to the bubble generating unit 11 and collides with the beam-like member 11 a provided in the bubble generating unit 11. In the process in which the hot water 39 mixed with air turns into a swirling flow and collides with the beam-shaped member 11a, the air and the hot water 39 are mixed, and relatively large bubbles in the hot water 39 are crushed.
When hot water 39 mixed with air colliding with the beam-like member 11 a provided in the bubble generating part 11 passes through the through-hole 11 b provided in the side wall of the bubble generating part 11 and is jetted into the outer cylinder part 13. Then, pressurization and depressurization are performed. At this time, the depressurization action, and the hot water 39 containing bubbles ejected from the through-hole 11b provided in the side wall of the bubble generation unit 11 is formed on the inner surface of the outer cylinder unit 13. By colliding, finer bubbles are generated. In addition, since the cover member 15 is provided in the present embodiment, the hot water 39 containing bubbles discharged from the opening of the outer cylinder portion 13 further collides with the inner wall surface of the closed end portion of the cover member 15. As a result, the bubbles are further miniaturized and a larger amount of fine bubbles are generated. And the fine bubble in the cover member 15 is discharged | emitted in the hot water 39 in the bathtub 37 from the arc-shaped opening 15d surrounding the insertion part 15b, and it exists in the upper part rather than the center part of the depth of the hot water 39 in the bathtub 37. A layer of fine bubbles is formed.

  At this time, for example, fine bubbles such as several μm to several tens of μm have a low levitation speed and tend to stay in the hot water 39. Therefore, since it is easy to maintain a state where a sufficient amount of fine bubbles stays in the hot water 39 in the bathtub 37, the bubble generating device including the nozzle 1 is located at the center of the depth of the hot water 39 in the bathtub 37. The upper part of the part can be made cloudy as if emulsified with fine bubbles.

  As described above, the bubble generating nozzle 1 according to the present embodiment includes the swirl flow forming portion 7, the swirl flow portion 9, the bubble generating portion 11, and the outer tube portion 13, so that the number is several μm to several tens μm. Such fine bubbles can be generated. For this reason, by providing the bubble generating device with the bubble generating nozzle as in the present embodiment, finer bubbles can be generated, and the amount of bubbles generated can be increased. Therefore, the performance of the bubble generating device can be improved by the nozzle.

Further, in the bubble generating device 16 provided with the bubble generating nozzle 1 of the present embodiment, when the inner diameter of the circulation pipe 17 is a relatively thin diameter such as about 10 mm, the circulation pipe 17, the pump 25, and Only by providing the gas pipe 31 and the gas flow rate adjusting valve 33, the bubble generating nozzle 1 can generate the required amount of bubbles as fine as required. Therefore, in the bubble generating nozzle 1 of the present embodiment, the configuration of the bubble generating device can be simplified depending on the pipe diameter of the bubble generating device. Furthermore, since the configuration is simplified, the cost of the bubble generating device can be reduced, and the restrictions on the installation and design of the bubble generating device can be reduced.
Furthermore, since the beam-like member 11a provided in the bubble generating unit 11 is a columnar member, the mixing ability and the ability to crush relatively large bubbles in the liquid can be improved. It can be improved. In addition, the beam-shaped member provided in the bubble generation part can also be made into shapes other than column shape. However, as in this embodiment, when the beam-like member provided in the bubble-generating part is formed into a columnar shape, the bubble-generating ability of the bubble-generating nozzle is improved as compared with the case of using other shapes of beam-like members. To do.

  In addition, a plurality of beam-shaped members 11a are provided in the bubble generating unit 11 at different positions in the flow path 3 of the bubble generating unit 11, and the plurality of beam-shaped members 11a have a mutual extending direction of 60. It is provided in a state of making an angle of degrees. Thereby, the mixing ability, the ability to break up relatively large bubbles in the liquid, and the like can be further improved, and the performance of the bubble generating device can be further improved by the nozzle. Note that the number of beam-like members provided in the bubble generating portion may be one, and when a plurality of beam-like members are provided, the angle formed by their extending directions can be set as appropriate. However, as in this embodiment, the bubble generating ability of the bubble generating nozzle is improved by providing two or more beam-shaped members in the bubble generating portion and further setting the angle formed by the two or more beam-shaped members to 60 degrees. improves.

  Furthermore, the bubble generating part 11 is provided with a plurality of through holes 11b formed in the side wall of the flow path 3, and the cylindrical bubble generating part 11 is formed at the same circumferential position among the plurality of through holes 11b. The plurality of through-holes provided are provided at an angle of 180 degrees. As a result, fine bubbles such as several μm to several tens of μm and a larger amount of bubbles are easily generated, and the performance of the bubble generating device can be further improved by the nozzle. The number of through holes formed in the side wall of the flow path of the bubble generation unit may be one, and when a plurality of through holes are provided, the angle at which they are provided can be set as appropriate. However, as in this embodiment, two or more through holes are provided in the side wall of the flow path of the bubble generation unit, and the angle formed by the two or more through holes is 60 degrees, 120 degrees, or 180 degrees. The bubble generation capability of the bubble generation nozzle is improved.

In addition, in the swirl flow portion 9, the width of the flow path 3 of the swirl flow portion 9 becomes narrower from the swirl flow formation portion 9 toward the bubble generation portion 11. Thereby, the pressure in the flow path 3 of the bubble generating nozzle 1 can be further increased, and the pressure reducing action caused by being ejected from the through hole 11b formed in the side wall of the flow path 3 of the bubble generating portion 11 is further increased. Therefore, the performance of the bubble generating device can be further improved by the nozzle 1. In addition, the width of the flow path of the swirl flow portion can be a shape that is not narrowed from the swirl flow formation portion toward the bubble generation portion. However, as in the present embodiment, the direction of the flow of the swirl flow portion becomes narrower as it goes from the swirl flow forming portion to the bubble generation portion. Ability improves.
Moreover, in this embodiment, in order to form the layer of a fine bubble in the upper part rather than the center part of the depth of the hot water 39 in the bathtub 37, it is the structure provided with the cover member 15, When fine bubbles are spread throughout the hot water 39, the cover member 15 may not be provided. In this case, the opening 13b of the outer cylinder part 13 is directed downward, and the hot water 39 containing bubbles discharged from the opening 13b of the outer cylinder part 13 collides with the bottom of the bathtub 37. Thereby, since the fine bubbles spread along the bottom surface of the bathtub 37 and then float upward, the entire hot water 39 in the bathtub 37 can be clouded as if emulsified with the fine bubbles.

(Second Embodiment)
Hereinafter, a second embodiment of a bubble generating nozzle and a bubble generating device to which the present invention is applied will be described with reference to FIGS. FIG. 7 is a longitudinal sectional view showing a schematic configuration of a bubble generating nozzle to which the present invention is applied. 8A and 8B are diagrams showing a schematic configuration of the connecting portion, where FIG. 8A is a view seen from the side connecting the swirling flow forming portion, FIG. 8B is a side view, and FIG. 8C is a circulation view. It is the figure seen from the side which connects a pipe line. 9A and 9B are diagrams showing a schematic configuration of the swirl flow forming portion, where FIG. 9A is a side view and FIG. 9B is a view as seen from the side connecting the connecting portions. FIG. 10 is a diagram illustrating a schematic configuration of the swirl flow portion, where (a) is a side view and (b) is a view as seen from the side connecting the swirl flow forming portions. 11A and 11B are diagrams illustrating a schematic configuration of the bubble generation unit, in which FIG. 11A is a side view, and FIG. 11B is a cross-sectional view taken along line XIb-XIb in FIG. 12A and 12B are diagrams illustrating a schematic configuration of the outer cylinder portion, in which FIG. 12A is a side view and FIG. FIG. 13 is a block diagram showing a schematic configuration of a bubble generating apparatus to which the present invention is applied. FIG. 14 is a diagram showing the operation of the bubble generating apparatus to which the present invention is applied and the pressure fluctuation in the portion on the downstream side of the pump of the liquid conduit.

  In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description regarding the same structure and shape is omitted, and the structure, shape, feature, and the like that are different from those in the first embodiment are omitted. Will be described. Further, in FIG. 7, in order to facilitate understanding of the configuration, a state in which the outer cylinder portion is excluded is shown, and the outer cylinder portion is indicated by a broken line in a portion where the outer cylinder portion is originally attached.

  This embodiment differs from the first embodiment in that the bubble generating nozzle is disassembled, the arrangement of the through-holes in the swirling flow forming section and the bubble generating section, the use of a cover member, and the generation of bubbles. These are the inner diameter of the pipe line to which the nozzle is attached, the configuration and operation of the bubble generating device, and the like.

  That is, as shown in FIG. 7, the bubble generating nozzle 43 of the present embodiment includes a connecting portion 5, a swirling flow forming portion 7, a swirling flow portion 9, a bubble generating portion 11, and an outer cylinder portion 13. This is the same as in the first embodiment. However, in the present embodiment, the connecting portion 5 and the swirling flow forming portion 7, the swirling flow portion 9 and the bubble generating portion 11 are each formed by separate parts. In the bubble generating nozzle 43 of the present embodiment, no cover member is attached to the outer cylinder portion 13.

In the cylindrical connecting portion 5 of the present embodiment, as shown in FIGS. 7 and 8, one screw 5 b that can be screwed with a screw cut in a pipe line (not shown) that connects the bubble generating nozzle 43 is provided. It is cut on the outer surface of the end of the. Furthermore, a screw 5b to which the swirl flow forming portion 7 is connected is cut on the outer surface of the connecting portion 5 on the other end side. Moreover, the diameter of the flow path 3 of the connection part 5 of this embodiment is large at the end part on the side where the swirl flow forming part 7 is connected.
As shown in FIGS. 7 and 9, the swirl flow forming portion 7 of the present embodiment has a shape in which cylindrical portions having substantially the same outer diameter are provided on both end surfaces of the disc-shaped portion. A screw 7b corresponding to the screw 5b of the connecting portion 5 is cut on the inner surface of the connecting portion 5, and a screw 7c for connecting the swirling flow portion 9 is cut on the outer surface of the other cylindrical portion. The disc-shaped portion of the swirl flow forming portion 7 is provided with eight through holes 7a that are provided at equal intervals on the same circle and penetrate from one end surface of the disc-shaped portion to the other end surface. Furthermore, one through-hole 7d penetrating from one end surface of the disc-shaped portion to the other end surface is formed at the central portion of the disc-shaped portion of the swirl flow forming portion 7.
Similarly to the first embodiment, the through hole 7a of the present embodiment is also inclined at an angle of, for example, about 5 degrees to 6 degrees with respect to the extending direction of the central axis of the disc-shaped portion of the swirling flow forming section 7. In this state, the disc-shaped portion of the swirl flow forming portion 7 is drilled from one end surface to the other end surface. And the eight through-holes 7a are formed in the state inclined in the same direction in the direction along the circumference of the disk-shaped part of the swirl flow forming part 7. Further, the through hole 7d is not inclined, and is formed along the central axis of the disk-shaped portion of the swirl flow forming portion 7. The through hole 7a has a smaller diameter than the through hole 7d.

  As shown in FIGS. 7 and 10, the swirling flow portion 9 of the present embodiment has an outer shape in which a cylindrical portion having a relatively large outer diameter and a cylindrical portion having a relatively small outer diameter are connected by a tapered portion. It has become. The flow path 3 in the cylindrical portion having a relatively large outer diameter is formed on a portion having a relatively large inner diameter and on the cylindrical portion side having a relatively small outer diameter, and is formed coaxially with the portion having a relatively large inner diameter. It is formed with a portion having a relatively small inner diameter. In other words, in the present embodiment, the inner diameter of the swirling flow portion 9 becomes narrower in two steps from one end side to the other end side. A screw 9a corresponding to the screw 7c of the swirl flow forming portion 7 is cut on the inner surface of the end portion of the portion having a relatively large inner diameter. On the other hand, a screw 9b for connecting the outer cylinder portion 13 is cut on the outer surface of the end portion having a relatively small inner diameter. Furthermore, a screw 9c for connecting the bubble generating part 11 is cut on the inner surface of the end part of the part of the flow path 3 formed in the part having a relatively small inner diameter.

The bubble generating part 11 of this embodiment is formed in a cylindrical shape whose outer diameter is narrower than that of the swirl flow part 9, and one end part is opened and the other end part is closed. A screw 11 c corresponding to the screw 9 c of the swirl flow portion 9 is cut on the outer surface of the opened end of the cylindrical bubble generating portion 11. The flow path 3 in the cylindrical bubble generating part 11 is formed with the same diameter as that of the relatively small inner diameter of the flow path 3 of the swirl flow part 9. Similarly to the first embodiment, the bubble generation unit 11 of the present embodiment is also provided with a columnar beam-shaped member 11a and a through hole 11b that penetrates the side wall of the bubble generation unit 11.
However, the through hole 11b of the present embodiment is provided not only on the downstream side but also on the upstream side with respect to the flow of the liquid flowing through the flow path 3 relative to the beam-like member 11a. It is also provided at the circumferential position where the member 11a is provided. Therefore, in the present embodiment, the through holes 11 b are provided in four stages at different positions of the bubble generating unit 11. In the present embodiment, the through hole 11b is provided on the upstream side of the beam-like member 11a, provided in the same circumferential position as the beam-like member 11a located on the upstream side, or positioned on the more downstream side. There are four stages, one provided at the same circumferential position as the beam-like member 11a and one provided further downstream than the beam-like member 11a located further downstream.
And the through-hole 11b provided in the same circumferential position of parts other than the circumferential position in which the beam-shaped member 11a was provided is drilled at an angle of every 60 degrees. Further, the through-hole 11b provided at the circumferential position where the beam-shaped member 11a is provided is such that the directly adjacent through-holes 11b are at an angle of every 60 degrees, and the adjacent through-holes 11b sandwiching the beam-shaped member 11a are 120. Drilled at an angle of degrees. Therefore, six through holes 11b of the present embodiment are provided at the same circumferential position other than the circumferential position where the beam-like member 11a is provided, and four at the circumferential position where the beam-like member 11a is provided. Will be. In addition, the bubble generation unit 11 according to the present embodiment extends from the through hole 11b formed on the most downstream side with respect to the flow of the liquid flowing through the flow path 3 to the closed end surface of the bubble generation unit 11. The length is formed to be substantially equal to the length from the open end face of the bubble generating part 11 to the through hole 11b formed on the most downstream side.

The outer cylinder portion 13 of the present embodiment has the same structure as that of the first embodiment, and is cut on the outer surface of the swirl flow portion 9 on the inner surface of one end as shown in FIGS. 7 and 12. A screw 13a corresponding to the screw 9b is cut. And the outer cylinder part 13 is the length from which the opening 13b of the edge part protrudes rather than the edge part by which the bubble generation part 11 was obstruct | occluded, and the edge part by which the bubble generation part 11 was obstruct | occluded is an outer cylinder part. 13 is the same as the first embodiment.
As shown in FIG. 13, the bubble generating device 45 to which the bubble generating nozzle 43 (hereinafter referred to as the nozzle 43) having such a configuration is attached includes a circulation pipe 17, an inflow flow rate adjusting valve 23, a pump 25, and a pressure gauge 27. The configuration including the discharge flow rate adjusting valve 29, the gas pipe line 31, and the operation panel 35 serving as a control means for controlling the operation and operation of the bubble generating device 45 is the same as that of the first embodiment. However, the bubble generating device 45 of the present embodiment is provided with a pressure sensor 47 serving as a pressure detecting means on the downstream side of the pressure gauge 27 with respect to the flow of the hot water 39 in the circulation pipe 17. An electromagnetic valve 49 is provided in the pipe line 19.
In the present embodiment, the circulation pipe 17 is a relatively thick pipe having an inner diameter of about 25 mm, for example. Therefore, as shown in FIG. 7, the nozzle 43 also corresponds to a relatively thick pipe having an inner diameter of about 25 mm. The connecting portion 5 of the present embodiment is formed to have a diameter corresponding to a pipe having an inner diameter of about 25 mm, and the screw 5b formed on the outer surface of the connecting portion 5 is not shown, but the inner diameter is about 25 mm. This is a screw corresponding to the screw formed on the inner surface of the end of the pipe. Further, in the swirl flow forming portion 7, in order to cope with a flow rate by a pipe having a relatively large diameter such as an inner diameter of about 25 mm, not only a plurality of inclined through holes 7a arranged in a circular shape but also a through hole in the central portion. 7d is formed. Further, the portion having a relatively large inner diameter of the flow passage 3 of the swirling flow portion 9 is about 25 mm in inner diameter of the circulation pipe 17, whereas the portion having a relatively small inner diameter is about 34 mm, for example. The inner diameter is about 12 mm. The outer cylinder portion 13 has an inner diameter of about 12 mm, for example, while the inner diameter of the circulation pipe 17 is about 25 mm.
In this embodiment, the pressure sensor 47 is composed of a pressure switch that switches between transmission and stop of a signal with two preset pressures, and is electrically connected to a circuit or the like serving as control means in the operation panel 35 via the wiring 41. Has been. Note that the pressure sensor 47 of the present embodiment is turned on to transmit a signal when the pressure increases and reaches a preset first set pressure P1, for example, about 0.6 MPa, and the pressure decreases and is preset. When the pressure reaches the second set pressure P2, for example, about 0.5 MPa, it is turned off to stop signal transmission. On the other hand, the electromagnetic valve 49 provided in the gas pipe line 31 performs two opening / closing operations in response to a signal from the operation panel 35, and is connected to a circuit or the like serving as a control means in the operation panel 35 via the wiring 41. Electrically connected.

  The operation panel 35 according to the present embodiment opens and closes an electromagnetic valve 49 provided in the gas pipeline 19 in response to a signal from the pressure sensor 47. That is, when the pressure sensor 47 is turned on and sends a signal, the control means sends a signal to the electromagnetic valve 49 to open the electromagnetic valve 49, and when the pressure sensor 47 is turned off and stops sending the signal, the control means is electromagnetic. Transmission of the signal to the valve 49 is stopped and the electromagnetic valve 49 is closed. Further, the circuit serving as the control means in the operation panel 35 includes a delay circuit. When the pressure sensor 47 is turned on and a signal is transmitted, the signal transmission to the electromagnetic valve 49 is delayed for a preset time. In other words, the electromagnetic valve 49 is opened after a delay of a set time after the pressure sensor 47 is turned on and a signal is transmitted by the delay circuit.

  The operation of the bubble generating apparatus having such a configuration and the features of the present invention will be described. In the bubble generating device 45 of the present embodiment, as shown in FIGS. 13 and 14, when the operation start command switch in the operation panel 35 is turned on, the pump 25 starts to drive, and the hot water 39 in the bathtub 37 flows into the inflow portion. The hot water 39 is discharged from the nozzle 43 into the bathtub 37 and the hot water 39 starts to circulate. At this time, since the electromagnetic valve 49 is closed, the pressure in the portion downstream of the pump 25 in the circulation line 17 by the hot water 39 discharged from the pump 25 is the maximum pressure adjusted by the discharge flow rate adjusting valve 29. The pressure rises toward the first set pressure P1.

  As shown in FIG. 14, the pressure in the downstream portion of the circulation line 17 from the pump 25 reaches the first set pressure P1 after elapse of time t1 from the start of operation, for example, after several seconds to several tens of seconds. Then, the pressure sensor 47 is turned on and a signal is transmitted. The control means in the operation panel 35 that has received the signal causes the electromagnetic valve 49 to pass the elapse of, for example, several seconds to several tens of seconds after elapse of a preset time t2 from when reception of the signal from the pressure sensor 47 is started by the delay circuit. A signal is transmitted and the solenoid valve 49 is opened. During this time, the pressure is maintained at the first set pressure P1.

  When the electromagnetic valve 49 is opened, air is sucked into the circulation line 17 from the open end of the gas line 19 through the gas line 19, and air is mixed into the hot water 39 flowing through the circulation line 17. . When air is mixed into the hot water 39 flowing through the circulation pipe 17, the pressure in the downstream portion of the circulation pipe 17 from the pump 25 decreases. When the pressure in the downstream portion of the circulation pipe 17 from the pump 25 is reduced to the second set pressure, the pressure sensor 47 stops signal transmission. Is stopped, and the solenoid valve 49 is closed.

  When the electromagnetic valve 49 is closed, air is not mixed into the hot water 39 flowing through the circulation pipe 17, so that the pressure in the downstream portion of the circulation pipe 17 from the pump 25 rises again. While this pressure rise and the first set pressure P <b> 1 are maintained, fine bubbles are generated by discharging hot water 39 from the nozzle 43, and fine bubbles are discharged into the bathtub 37. When the pressure in the portion of the circulation line 17 downstream of the pump 25 rises again and reaches the first set pressure P1, when the set time t2 elapses, the electromagnetic valve 49 opens and flows through the circulation line 17. The hot water 39 is again mixed with air, and the pressure in the downstream portion of the circulation line 17 from the pump 25 is reduced. By repeating this operation, an air mixing process for mixing air into the hot water 39 flowing through the circulation pipe 17 and a fine bubble generating process for generating fine bubbles are repeated. And the hot water 39 containing this fine bubble is discharged in the bathtub 37 through the nozzle 43 of this embodiment, By the effect | action similar to 1st Embodiment, a finer bubble is produced in the nozzle 43. The amount of bubbles generated and generated is increased.

  It should be noted that the time t4 required to increase the pressure in the portion downstream of the pump 25 of the circulation line 17 from the second set pressure to the first set pressure, and the circulation line 17 from the first set pressure to the second set pressure. The time t3 required for the pressure drop in the downstream portion of the pump 25 is about several seconds to several tens of seconds. Therefore, fine bubbles are discharged into the hot water 39 in the bathtub 37 at intervals of several seconds to several tens of seconds. However, fine bubbles such as several μm to several tens of μm, for example, are discharged from the nozzle 43 into the hot water 39, and such fine bubbles have a low floating speed of the fine bubbles in the hot water 39, for example, a water depth of 600 mm. In the bathtub of about, it stays in the hot water 39 for about 3 to 5 minutes. For this reason, if bubbles are intermittently discharged from the nozzle 43 into the hot water 39 at intervals of about 1 minute or less, a state in which a sufficient amount of fine bubbles stays in the hot water 39 in the bathtub 37 can be maintained. Accordingly, almost the entire hot water 39 in the bathtub 37 can be made cloudy as if emulsified with fine bubbles.

  As described above, the bubble generating nozzle 45 of the present embodiment also includes the swirl flow forming unit 7, swirl flow unit 9, bubble generating unit 11, and outer cylinder unit 13. Can be improved.

  In the bubble generating device 1 of the present embodiment, one nozzle 43 is connected to one pump 25. However, in the bubble generating device to which the present invention is applied, one pump 25 is connected. A plurality of nozzles 43 can be connected and used. For example, a bubble generating device in which two circulation channels 17 are connected to one pump can be used.

  Further, in the bubble generating device 45 of the present embodiment, as shown in FIG. 14, after a predetermined time has elapsed since the pressure in the downstream portion of the circulation line 17 from the pump 25 reaches the first set pressure, By opening the electromagnetic valve 49 provided in the gas pipe 19, a period of time during which the pressure in the portion downstream of the pump 25 in the circulation pipe 17 is maintained at the first set pressure is provided. However, there is no time during which the pressure in the downstream portion of the circulation line 17 from the pump 25 is maintained at the first set pressure, and the pressure in the downstream portion of the circulation line 17 from the pump 25 is reduced. The electromagnetic valve 49 can also be opened when the first set pressure is reached. However, as in the present embodiment, the time in which the pressure in the portion on the downstream side of the pump 25 of the circulation pipe 17 is maintained at substantially the first set pressure is provided, while the other can increase the concentration of fine bubbles, The ability to generate bubbles can be improved.

  In this embodiment, the pressure sensor 47 which is a pressure switch that switches between transmission and stop of a signal with two preset pressures is used as the pressure detection means. However, as the pressure detection means, the circulation line 17 is used. If the internal pressure can be detected, various pressure detecting means can be used. Further, various configurations such as providing two pressure switches in the circulation line 17, that is, a pressure switch that transmits a signal at the first set pressure P <b> 1 and another pressure switch that transmits a signal at the second set pressure P <b> 2. it can.

  In this embodiment, the pressure sensor 47 which is a pressure switch that switches between transmission and stop of a signal with two preset pressures is used as the pressure detection means. However, as the pressure detection means, the circulation line 17 is used. If the internal pressure can be detected, various pressure detecting means can be used. Further, various configurations such as providing two pressure switches in the circulation line 17, that is, a pressure switch that transmits a signal at the first set pressure P <b> 1 and another pressure switch that transmits a signal at the second set pressure P <b> 2. it can.

  Moreover, in 1st and 2nd embodiment, although the connection part 5 connected with the edge part of the circulation line 17 with the screw 5a was shown as a connection part, a connection part is connected with the circulation line of a bubble generating apparatus. If possible, the structure can be made not limited to screws but also for various connection methods.

  The bubble generating nozzle of the present invention is not limited to the bubble generating device shown in the first and second embodiments, and can be applied to bubble generating devices having various configurations. At this time, if the inner diameter is relatively small, for example, depending on the inner diameter of the tube of the circulation line of the bubble generating device, the necessary fine bubbles can be generated only by the bubble generating nozzle of the present invention. For example, when the inner diameter is relatively thick, it is difficult to generate a necessary amount of bubbles as much as necessary with only the bubble generating nozzle of the present invention, but other than the nozzle as in the second embodiment. By combining with a bubble generating device having the ability to generate fine bubbles in the configuration, the performance of the bubble generating device can be improved. In particular, when the inner diameter is relatively large, the combination of the bubble generating device and the bubble generating nozzle configured as shown in the second embodiment can simplify the configuration of the bubble generating device and reduce the bubble generating device. The bubble generation ability of can be improved.

It is a longitudinal cross-sectional view which shows the schematic structure of 1st Embodiment of the nozzle for bubble generation formed by applying this invention in the state which decomposed | disassembled the cover member. It is a figure which shows schematic structure of the connection part and swirl flow formation part in 1st Embodiment of the nozzle for bubble generation to which this invention is applied, (a) is the figure seen from the swirl flow formation part side, b) is a sectional view taken along line IIb-IIb in (a), and (c) is a view as seen from the connecting portion side. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the swirl flow part and bubble generation part in 1st Embodiment of the nozzle for bubble generation to which this invention is applied, (a) is the figure seen from the bubble generation part side, ( b) is a cross-sectional view taken along line IIIb-IIIb in (a), (c) is a view seen from the swirl flow section side, and (d) is an arrow from line IIId-IIId in (b). FIG. It is a figure which shows schematic structure of the outer cylinder part in 1st Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is the figure seen from the discharge outlet side, (b) is (a) ) Is a cross-sectional view taken along the line IVb-IVb, and (c) is a view as seen from the side of the connecting portion with the swirling flow part. It is a figure which shows schematic structure of the cover member in 1st Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is the figure seen from the obstruction | occlusion end part side, (b) is (a) ) Is a cross-sectional view from the Vb-Vb line, and (c) is a view as seen from the outer cylinder insertion side end. It is a block diagram showing a schematic structure of a 1st embodiment of a bubble generating device to which the present invention is applied. It is a longitudinal cross-sectional view which shows schematic structure of 2nd Embodiment of the nozzle for bubble generation formed by applying this invention. It is a figure which shows schematic structure of the connection part in 2nd Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is the figure seen from the side which connects a swirl | flow flow formation part, (b) (A) A side view, (c) is the figure seen from the side which connects a circulation line. It is a figure which shows schematic structure of the swirl | flow flow formation part in 2nd Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is a side view, (b) is the side which connects a connection part. It is the figure seen from. It is a figure which shows schematic structure of the swirl | circulation flow part in 2nd Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is a side view, (b) connects a swirl flow formation part. It is the figure seen from the side to do. It is a figure which shows schematic structure of the bubble generation part in 2nd Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is a side view, (b) is XIb-XIb of (a). It is sectional drawing in a line. It is a figure which shows schematic structure of the outer cylinder part in 2nd Embodiment of the nozzle for bubble generation formed by applying this invention, (a) is a side view, (b) is the figure seen from the discharge outlet side. It is. It is a block diagram which shows schematic structure of 2nd Embodiment of the bubble generator formed by applying this invention. It is a figure which shows the operation | movement in 2nd Embodiment of the bubble generator to which this invention is applied, and the pressure fluctuation in the part of the downstream of a liquid line pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bubble generating nozzle 3 Flow path 5 Connection part 7 Swirling flow formation part 7a Through hole 9 Swirling flow part 11 Bubble generating part 11a Beam-shaped member 11b Through hole 13 Outer cylinder part 15 Cover member

Claims (6)

It is connected to a pipe line through which a liquid mixed with gas flows, and the inside is connected to the cylindrical connecting part that becomes a flow path of the liquid mixed with gas, and is connected to the connecting part in a symmetrical or circular shape. A plurality of through holes in a columnar or disk shape formed from one end surface to the other end surface, and a swirl flow forming portion in which one opening of the plurality of through holes communicates with the flow path of the connecting portion; and the swirl flow A swirl flow portion having a cylindrical shape continuous to the forming portion, and the inside thereof becomes a liquid flow passage mixed with gas, and the other openings of the plurality of through holes of the swirl flow forming portion communicate with the flow passage; A side wall of the flow path which is continuous with the swirl flow part and has a cylindrical shape in which the inside becomes a liquid flow path mixed with gas and the end on the side not continuous with the swirl flow part is closed. A bubble generating part having a through-hole formed in and a coaxial part of the bubble generating part and covering the bubble generating part In Jo, and an outer tubular portion end surface opposite to the swirling flow stream portion is open,
The plurality of through holes of the swirl flow forming portion are formed to be inclined in the same direction along the circumference of the swirl flow forming portion, and the swirl flow of the liquid mixed with the gas flowing out of the plurality of through holes is formed. The bubble generating part has at least one beam-like member installed in a direction intersecting a flow direction of the liquid mixed with the gas in the flow path of the bubble generating part, The through-hole formed in the side wall of the flow path is a bubble generating nozzle provided on the downstream side with respect to the flow of liquid mixed with gas at least from the beam-like member. The bubble generating nozzle according to claim 1, wherein the beam-shaped member provided in the bubble generating portion is a columnar member. 3. The bubble according to claim 1, wherein the swirl flow portion narrows the width of the flow path of the swirl flow portion from the swirl flow formation portion toward the bubble generation portion. Generation nozzle. One end surface is cylindrical, and the outer cylindrical portion can be inserted into the central portion, and the other end surface is closed, and the peripheral portion of the central portion into which the outer cylindrical portion of the one end surface is inserted The nozzle for generating bubbles according to any one of claims 1 to 3, further comprising a cover member in which an opening is formed. A liquid channel through which the liquid flows, a liquid feeding means provided in the liquid channel, a gas channel communicating with the liquid channel and supplying gas into the liquid, and the liquid flow A nozzle provided at the exit end of the road,
The bubble generating device according to any one of claims 1 to 4, wherein the nozzle is a bubble generating nozzle. A liquid flow path through which the liquid flows, a liquid feeding means provided in the liquid flow path, a gas flow path that communicates with the liquid flow path and supplies a gas into the liquid, and the gas flow A valve that is provided in a passage and controls the flow of gas in the gas flow path, and a pressure that detects a pressure in a portion of the liquid flow path downstream of the liquid flow means with respect to the liquid flow Comprising a detection means and a nozzle provided at an outlet side end of the liquid flow path,
The valve opens when the pressure detected by the pressure detection means reaches a first set pressure, and closes when the pressure detected by the pressure detection means becomes a second set pressure lower than the first set pressure, A bubble generating device, wherein the nozzle is the nozzle for generating bubbles according to any one of claims 1 to 5.

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