JP7232713B2 - Fine bubble generation nozzle - Google Patents

Description

The technology disclosed in this specification relates to a microbubble generating nozzle.

Patent Literature 1 discloses a microbubble generating nozzle. This fine bubble generating nozzle includes a nozzle body, which is a cylindrical member having fine ejection holes, and a nozzle cover attached to the tip of the nozzle body. The nozzle cover has a wall facing the ejection hole and an outflow hole that is finer than the ejection hole.

In the fine bubble generating nozzle of Patent Document 1, when gas-dissolved pressurized water in which gas (for example, air, carbon dioxide, hydrogen, etc.) is dissolved in water is supplied to the nozzle body, the gas-dissolved pressurized water passes through the nozzle body. It is ejected from the ejection port toward the wall. The gas-dissolved pressurized water ejected from the ejection hole collides with the wall, detours within the nozzle cover, and then flows out from the outflow hole to an outflow location (specifically, a bathtub). The gas-dissolved pressurized water is gradually decompressed to atmospheric pressure by passing through fine jet holes and finer outflow holes. In the process of depressurizing the gas-dissolved pressurized water, the gas dissolved in the gas-dissolved pressurized water is precipitated to generate fine bubbles. That is, in the microbubble generating nozzle of Patent Document 1, the pressure of the gas-dissolved pressurized water is reduced in the process of circulation of the gas-dissolved pressurized water, so that the gas-dissolved pressurized water flowing out to the outflow location (specifically, the bathtub) contains fine bubbles. be able to.

JP 2007-167557 A

However, in the microbubble generating nozzle of Patent Document 1, a situation occurs in which the amount of microbubbles contained in the gas-dissolved pressurized water flowing out to the outflow location is insufficient.

The present specification provides a technique that allows a large amount of microbubbles to be included in the gas-dissolved pressurized water that flows out to the outflow location.

The fine bubble generating nozzle disclosed in the present specification is a reduced pressure flow part for reducing the pressure of gas-dissolved pressurized water in which gas is dissolved in water, and is provided at a pressure reducing pipe and an upstream end of the pressure reducing pipe. an inlet-side opening for introducing the gas-dissolved pressurized water into the pressure-reducing pipe; an outlet-side opening provided at the downstream end of the pressure-reducing pipe for discharging the gas-dissolved pressurized water that has passed through the pressure-reducing pipe; and a first collision chamber provided on the downstream side of the reduced pressure flow section, the first collision chamber having a flow passage area larger than the opening area of the outlet side opening, and discharging from the outlet side opening The gas-dissolving pressurized water collides with the gas-dissolving pressurized water provided in a range facing the outlet-side opening and discharged from the outlet-side opening. The first collision chamber having a first collision wall for changing the direction of flow of pressurized water, and a projecting portion provided on the first collision wall and projecting from the first collision wall toward the outlet side opening. and an outflow portion that causes the gas-dissolved pressurized water that has passed through the first collision chamber to flow out to an outflow location , and the tip portion of the projecting portion passes through the outlet side opening into the pressure reducing pipe. placed in

According to this configuration, when the gas-dissolved pressurized water is introduced into the decompression tube from the outside, the flow rate increases by passing through the inlet side opening, resulting in decompression (Venturi effect). By reducing the pressure of the gas-dissolved pressurized water, the gas dissolved in the gas-dissolved pressurized water is precipitated to generate bubbles. Then, the gas-dissolved pressurized water discharged from the outlet-side opening of the decompression tube is introduced into the first collision chamber. As described above, the channel area of the first channel space is larger than the opening area of the outlet side opening. Therefore, the flow velocity of the gas-dissolved pressurized water discharged from the outlet side opening is reduced by being introduced into the first collision chamber. The pressure of the gas-dissolved pressurized water is increased by decreasing the flow velocity. Further, in the above configuration, the protruding portion protrudes from the first collision wall toward the exit side opening. Therefore, the gas-dissolved pressurized water flowing through the decompression tube collides with the projecting portion, thereby further reducing the flow velocity and further increasing the pressure. Furthermore, the gas-dissolved pressurized water that has collided with the projecting portion also collides with the first collision wall, thereby changing the flow direction and further reducing the flow velocity. As a result, the gas-dissolved pressurized water is further pressurized. When the pressure of the gas-dissolved pressurized water after bubbles are precipitated by depressurization is increased, some of the bubbles contained in the gas-dissolved pressurized water split to become fine bubbles. According to the above configuration, the flow velocity of the gas-dissolved pressurized water discharged from the outlet-side opening of the decompression tube is introduced into the first collision chamber, collides with the protrusion, collides with the first collision wall, , and the pressure of the gas-dissolved pressurized water is increased each time. Then, every time the pressure is increased, part of the bubbles contained in the gas-dissolved pressurized water splits into fine bubbles. That is, according to the above configuration, the pressure of the gas-dissolved pressurized water decompressed by passing through the inlet side opening can be increased in at least three steps until it flows out from the outflow part to the outflow location. Therefore, according to the above configuration, it is possible to sufficiently ensure the chances that the bubbles contained in the gas-dissolved pressurized water are split to form fine bubbles. Therefore, according to the above configuration, a large amount of microbubbles can be included in the gas-dissolved pressurized water that flows out to the outflow location.
In addition, according to this configuration, after the gas-dissolved pressurized water flowing through the decompression tube collides with the protrusion and further collides with the inner surface of the decompression tube in the vicinity of the downstream end, the gas-dissolved pressurized water flows from the outlet side opening to the first 1 can be discharged into a collision chamber. That is, according to this configuration, the number of collisions of the gas-dissolved pressurized water increases. As a result, the flow velocity of the gas-dissolved pressurized water is sufficiently reduced, and the pressure of the gas-dissolved pressurized water can be sufficiently increased. That is, it is possible to secure a sufficient chance of forming microbubbles by breaking the bubbles contained in the gas-dissolved pressurized water. Therefore, according to the above configuration, the gas-dissolved pressurized water flowing out to the outflow portion can contain a larger amount of microbubbles.

The term "gas" as used herein includes any gas that can be dissolved in water, such as air, carbon dioxide, and hydrogen. In addition, the "flow path area of the first flow path space" means the flow direction of the gas-dissolved pressurized water in the space including the path until the gas-dissolved pressurized water discharged from the outlet side opening collides with the first collision wall. and an area of a plane perpendicular to the flow direction of the gas-dissolved pressurized water in the space including the path until the gas-dissolved pressurized water after colliding with the first collision wall is supplied to the outflow point; including at least one of

Another microbubble generating nozzle disclosed in this specification is a pressure reduction flow part for reducing the pressure of gas-dissolved pressurized water in which gas is dissolved in water, comprising a pressure reduction tube and an upstream end of the pressure reduction tube An inlet-side opening provided in the decompression pipe for introducing the gas-dissolved pressurized water into the decompression pipe, and an outlet-side opening provided at the downstream end of the decompression pipe for discharging the gas-dissolved pressurized water that has passed through the decompression pipe and a first collision chamber provided on the downstream side of the reduced pressure circulation part, the first collision chamber having a flow area larger than the opening area of the outlet side opening, and the outlet side opening The gas-dissolved pressurized water discharged from the exit-side opening collides with a first flow path space through which the gas-dissolved pressurized water discharged from the The first collision wall that changes the flow direction of the gas-dissolved pressurized water, and a projecting portion that is provided on the first collision wall and projects from the first collision wall toward the outlet side opening. a collision chamber, an outflow portion for flowing out the gas-dissolved pressurized water after passing through the first collision chamber to an outflow location, and a second collision chamber provided downstream of the first collision chamber and upstream of the outflow portion. and a collision chamber, wherein the second collision chamber has a passage area larger than the passage area of the first passage space, and passes the gas-dissolved pressurized water after passing through the first collision chamber. and a second collision wall for changing the flow direction of the gas-dissolved pressurized water by colliding with the gas-dissolved pressurized water after passing through the first collision chamber.

According to this configuration, when the gas-dissolved pressurized water is introduced into the decompression tube from the outside, the flow rate increases by passing through the inlet side opening, resulting in decompression (Venturi effect). By reducing the pressure of the gas-dissolved pressurized water, the gas dissolved in the gas-dissolved pressurized water is precipitated to generate bubbles. Then, the gas-dissolved pressurized water discharged from the outlet-side opening of the decompression tube is introduced into the first collision chamber. As described above, the channel area of the first channel space is larger than the opening area of the outlet side opening. Therefore, the flow velocity of the gas-dissolved pressurized water discharged from the outlet side opening is reduced by being introduced into the first collision chamber. The pressure of the gas-dissolved pressurized water is increased by decreasing the flow velocity. Further, in the above configuration, the protruding portion protrudes from the first collision wall toward the exit side opening. Therefore, the gas-dissolved pressurized water flowing through the decompression tube collides with the projecting portion, thereby further reducing the flow velocity and further increasing the pressure. Furthermore, the gas-dissolved pressurized water that has collided with the projecting portion also collides with the first collision wall, thereby changing the flow direction and further reducing the flow velocity. As a result, the gas-dissolved pressurized water is further pressurized. When the pressure of the gas-dissolved pressurized water after bubbles are precipitated by depressurization is increased, some of the bubbles contained in the gas-dissolved pressurized water split to become fine bubbles. According to the above configuration, the flow velocity of the gas-dissolved pressurized water discharged from the outlet-side opening of the decompression tube is introduced into the first collision chamber, collides with the protrusion, collides with the first collision wall, , and the pressure of the gas-dissolved pressurized water is increased each time. Then, every time the pressure is increased, part of the bubbles contained in the gas-dissolved pressurized water splits into fine bubbles. That is, according to the above configuration, the pressure of the gas-dissolved pressurized water decompressed by passing through the inlet side opening can be increased in at least three steps until it flows out from the outflow part to the outflow location. Therefore, according to the above configuration, it is possible to sufficiently ensure the chances that the bubbles contained in the gas-dissolved pressurized water are split to form fine bubbles. Therefore, according to the above configuration, a large amount of microbubbles can be included in the gas-dissolved pressurized water that flows out to the outflow location.
In addition, the channel area of the second channel space is larger than the channel area of the first channel space. Therefore, according to the above configuration, the flow velocity of the gas-dissolved pressurized water after passing through the first collision chamber is reduced by being introduced into the second collision chamber. As a result, the pressure of the gas-dissolved pressurized water introduced into the second collision chamber is increased. Further, the gas-dissolved pressurized water introduced into the second collision chamber further collides with the second collision wall, thereby changing the flow direction and further reducing the flow velocity. As a result, the gas-dissolved pressurized water is further pressurized. That is, it is possible to increase the chances of forming fine bubbles by breaking the bubbles contained in the gas-dissolved pressurized water. Therefore, according to the above configuration, the gas-dissolved pressurized water flowing out to the outflow portion can contain a larger amount of microbubbles.

Here, the "flow area of the second flow path space" means the flow of the gas-dissolved pressurized water in the space including the path until the gas-dissolved pressurized water introduced from the first collision chamber collides with the second collision wall. and an area of a plane perpendicular to the flow direction of the gas-dissolved pressurized water in the space including the path until the gas-dissolved pressurized water is supplied to the outflow point after colliding with the second collision wall. , including at least one of

A tip portion of the protrusion may pass through the outlet-side opening and be disposed within the decompression tube.

According to this configuration, after the gas-dissolved pressurized water flowing through the decompression tube collides with the protrusion and further collides with the inner surface of the decompression tube in the vicinity of the downstream end, the first collision occurs from the outlet-side opening. It can be discharged indoors. That is, according to this configuration, the number of collisions of the gas-dissolved pressurized water increases. As a result, the flow velocity of the gas-dissolved pressurized water is sufficiently reduced, and the pressure of the gas-dissolved pressurized water can be sufficiently increased. That is, it is possible to secure a sufficient chance of forming microbubbles by breaking the bubbles contained in the gas-dissolved pressurized water. Therefore, according to the above configuration, the gas-dissolved pressurized water flowing out to the outflow portion can contain a larger amount of microbubbles.

The opening area of the outlet side opening may be greater than or equal to the opening area of the inlet side opening.

According to this configuration, the flow area of the decompression tube gradually increases from the inlet side opening toward the outlet side opening (or the flow area does not change from the inlet side opening toward the outlet side opening). mode). That is, while the gas-dissolved pressurized water in the decompression tube, which has been decompressed by passing through the inlet-side opening, flows through the decompression tube from the inlet-side opening toward the outlet-side opening, the flow velocity of the gas-dissolved pressurized water is reduced, and the gas is The dissolution pressurized water can be pressurized. That is, it is possible to increase the chances of forming fine bubbles by breaking the bubbles contained in the gas-dissolved pressurized water. Therefore, according to the above configuration, the gas-dissolved pressurized water flowing out to the outflow portion can contain a larger amount of microbubbles.

The projecting portion may have an inclined portion that is inclined with respect to the flow direction when viewed along the flow direction of the gas-dissolved pressurized water.

According to this configuration, the gas-dissolved pressurized water that collides with the projecting portion can flow along the inclined portion. Therefore, formation of turbulent flow by the gas-dissolved pressurized water colliding with the projecting portion is suppressed. By suppressing the formation of turbulence, it is possible to suppress variations in the size of fine bubbles contained in the gas-dissolved pressurized water.

1 is a perspective view of a microbubble generating nozzle 10 of a first embodiment; FIG. FIG. 2 is a cross-sectional view of the microbubble generating nozzle 10 taken along line II-II in FIG. 1; The perspective view of the nozzle main body 20 of 1st Example. The perspective view of the holder part 40 of 1st Example. Sectional drawing of the fine bubble generation nozzle 100 of 2nd Example. The perspective view of the holder part 140 of 2nd Example. Sectional drawing of the fine bubble generation nozzle 200 of 3rd Example. The perspective view of the holder part 240 of 3rd Example. The perspective view of the holder part 340 of 4th Example. The perspective view of the holder part 440 of 5th Example.

(First embodiment)
(Structure of fine bubble generating nozzle 10)
A microbubble generating nozzle 10 of a first embodiment will be described with reference to FIGS. 1 to 4. FIG. The microbubble generating nozzle 10 is a nozzle for supplying water containing microbubbles to an outflow location such as a bathtub (not shown). As shown in FIG. 1 , the microbubble generating nozzle 10 includes a nozzle body 20 and a holder portion 40 . 1 and 2, the nozzle body 20 is supported by the holder portion 40. As shown in FIG.

(Structure of Nozzle Body 20)
The configuration of the nozzle body 20 will be described with reference to FIGS. 1 to 3. FIG. In the following description, the X-axis direction in FIG. 2 may be referred to as the left-right direction, the Y-axis direction as the up-down direction, and the Z-axis direction as the front-rear direction. As shown in FIG. 3 , the nozzle body 20 includes a decompression tube 22 and a collar portion 28 .

As shown in FIGS. 1 to 3, the decompression pipe 22 is a tubular member capable of decompressing the air-dissolved pressurized water in which air is dissolved in water. As shown in FIG. 2, inside the decompression tube 22, a partition wall 25 is provided to partition the interior of the decompression tube 22 into two tube portions. Two inlets 23 are opened at the upstream end portion 22a (the end portion on the positive side of the Z axis in the figure) on the rear side of the decompression tube 22 . A water supply means (not shown) for supplying air-dissolved pressurized water in which air is dissolved in water is connected to the inlet 23 . The air-dissolved pressurized water is a liquid that serves as a raw material for water containing microbubbles that is supplied to the outflow point.

Two inlet-side openings 24 are located in the vicinity of the upstream end 22a of the decompression pipe 22 and slightly forward (closer to the negative direction of the Z axis) than the two inlets 23. is open. The opening area of the inlet side opening 24 is smaller than the opening area of the inflow port 23 . In other words, the decompression tube 22 has a reduced diameter at the inlet-side opening 24 . The partition wall 25 divides the section from the rear upstream end 22a of the decompression tube 22 (the end on the positive side of the Z-axis in the drawing) to the middle of the decompression tube 22 into two pipe sections. there is Therefore, the front downstream end portion 22b of the decompression tube 22 (the end portion on the negative direction side of the Z axis in the drawing) is not divided into two pipe portions by the dividing wall 25 . Only one outlet side opening 26 is opened in the downstream end 22b. In this embodiment, the opening area of the outlet side opening 26 (that is, the area on the XY plane) is larger than the total area of the opening areas of the two inlet side openings 24 (that is, the area on the XY plane). In other words, the decompression tube 22 expands in diameter from the inlet side opening 24 toward the outlet side opening 26 .

As shown in FIGS. 1 to 3, the collar portion 28 is a disc-shaped member provided on the outer surface of the decompression tube 22 near the middle portion in the front-rear direction. As shown in FIG. 2 , the outer diameter of the collar portion 28 is larger than the outer diameter of the pressure reducing tube 22 .

(Configuration of holder portion 40)
Next, the configuration of the holder portion 40 will be described with reference to FIGS. 1, 2, and 4. FIG. As clearly shown in FIG. 4 , the holder portion 40 includes an outer cylindrical portion 42 , an inner cylindrical portion 44 and two connecting portions 52 . The outer cylindrical portion 42 and the two connecting portions 52 are continuously and integrally formed. The inner cylindrical portion 44 is formed inside the outer cylindrical portion 42 .

The outer cylindrical portion 42 is a cylindrical member. As shown in FIGS. 2 and 4, a step 43 is formed in the opening on the rear side to accommodate the flange 28 of the nozzle body 20 described above.

The two connecting portions 52 are formed to protrude outward from the outer peripheral surface of the outer cylindrical portion 42 . A screw hole B is provided in the connecting portion 52 . A screw hole B of the connecting portion 52 is a screw hole for attaching the holder portion 40 to a bathtub connector (not shown). The bathtub connector is a device for attaching the microbubble generating nozzle 10 to the bathtub. After inserting the nozzle body 20 into the holder part 40, the mounting hole (not shown) of the bathtub connector and the screw hole B of the connecting part 52 are aligned, and the screw member (not shown) is screwed into the screw hole B. By doing so, the fine bubble generating nozzle 10 and the bathtub connector are connected.

The inner cylindrical portion 44 is a cylindrical member that is accommodated inside the outer cylindrical portion 42 . The inner cylindrical portion 44 is connected to the inner surface of the outer cylindrical portion 42 via four connecting portions 48 . A gap between the inner cylindrical portion 44 and the outer cylindrical portion 42 forms four outlets 50 .

A disc portion 46 is formed at the front end portion of the inner cylindrical portion 44 . The disk portion 46 closes the front end of the inner cylindrical portion 44 . A projecting portion 49 is formed in the central portion of the disk portion 46 in the XY plane. The protruding portion 49 is a substantially columnar protruding member that protrudes rearward from the rear surface of the disk portion 46 . As shown in FIG. 2, when viewed along the direction from the rear to the front (that is, the flow direction of the air-dissolved pressurized water (see the arrow in FIG. 2)), there is a A sloped portion 49a is formed that slopes against it. In other words, the vicinity of the tip of the projecting portion 49 is formed in a shape that is pointed rearward.

(State in which the nozzle body 20 is supported by the holder portion 40)
Next, the positional relationship of each component when the nozzle body 20 is supported by the holder portion 40 will be described. As shown in FIGS. 1 and 2, the nozzle body 20 is supported by the holder portion 40 to form the microbubble generating nozzle 10 of this embodiment. In this state, the downstream end portion 22b of the decompression tube 22 and the flange portion 28 of the nozzle body 20 are inserted into the holder portion 40 . Specifically, the downstream end portion 22b of the decompression tube 22 is inserted into an inner cylindrical portion 44 (described later) of the holder portion 40 . Also, the collar portion 28 is accommodated within a step 43 formed in the opening of the outer cylindrical portion 42 . At this time, the front surface 28 a of the collar portion 28 abuts on the step 43 . When the nozzle body 20 is supported by the holder portion 40 , the upstream end portion 22 a of the decompression tube 22 protrudes rearward from the holder portion 40 .

As shown in FIG. 2, when the nozzle body 20 is supported by the holder portion 40, the tip portion including the inclined portion 49a of the projecting portion 49 passes through the outlet side opening portion 26 and enters the pressure reducing tube 22. placed. In the example of FIG. 2 , the tip portion of the projecting portion 49 faces the front end portion of the partition wall 25 . The downstream end portion 22b of the decompression tube 22 is arranged inside the inner cylindrical portion 44 and forward of the tip portion of the projecting portion 49 (that is, closer to the negative direction of the Z axis). Also, in this state, the downstream end 22b of the decompression tube 22 and the disc portion 46 are arranged to face each other.

By supporting the nozzle body 20 on the holder portion 40 , the nozzle body 20 and the holder portion 40 form a channel space 60 , a channel space 62 , a passage 64 , a channel space 66 , and a passage 68 . The channel space 60, the channel space 62, the passage 64, the channel space 66, and the passage 68 are all spaces and passages for circulating the air-dissolved pressurized water in this order.

The channel space 60 is a space formed between the outside of the projecting portion 49 and the downstream end portion 22b. Here, the channel area of the channel space 60 (that is, the area on the XY plane) is larger than the total area of the opening areas of the two inlet-side openings 24 .

The channel space 62 is formed downstream of the channel space 60 . A channel space 62 is formed between the downstream end 22b of the decompression tube 22 and the disc portion 46 . The channel area of the channel space 62 is larger than the total area of the channel areas of the channel space 60 described above at any portion. Specifically, in front of the downstream end 22b of the pressure reducing tube 22, the area on the XY plane of the space between the extension line of the downstream end 22b and the projecting portion 49, and the downstream end 22b and the circle The area of the space between the plate portion 46 (more specifically, the axis extending vertically from the center of the XY plane of the disk portion 46 is the central axis, and the central axis on the XY plane and the downstream end 22b of the virtual cylinder whose radius is the line connecting the outside of the flow path space 60 larger than the total area of the flow passage area.

A passageway 64 is formed downstream of the channel space 62 . Passage 64 is formed between the inner surface of inner cylindrical portion 44 and the outer surface of vacuum tube 22 disposed within inner cylindrical portion 44 . Here, the channel area of the passage 64 (that is, the area on the XY plane) is larger than the channel area of any portion of the channel space 62 described above.

A channel space 66 is formed downstream of the passage 64 . A flow passage space 66 is formed between the rear end of the inner cylindrical portion 44 and the front surface 28 a of the collar portion 28 . The flow passage space 66 is a space defined by the rear end of the inner cylindrical portion 44 , the inner surface of the outer cylindrical portion 42 , the outer surface of the decompression tube 22 , and the front surface 28 a of the collar portion 28 . The flow area of the flow space 66 is larger than the flow area of the passage 64 described above at any portion. Specifically, the area on the XY plane of the space between the rear end of the inner cylindrical portion 44 and the outer surface of the decompression tube 22, the area of the space between the rear end of the inner cylindrical portion 44 and the front surface 28a of the collar portion 28 ( More specifically, the center axis is an axis extending vertically from the center of the disk portion 46 on the XY plane, and the radius is a line connecting the center axis on the XY plane and the outside of the inner cylindrical portion 44 area of the outer surface portion of the range between the rear end of the inner cylindrical portion 44 and the front surface 28a), and the space between the rear end of the inner cylindrical portion 44 and the inner surface of the outer cylindrical portion 42 area on the XY plane is larger than the passage area of the passage 64 described above.

A passageway 68 is formed downstream of the channel space 66 . A passage 68 is a passage that connects the flow passage space 66 and the outlet 50 . Passage 68 is formed by a gap between the inner surface of outer cylindrical portion 42 and the outer surface of inner cylindrical portion 44 . Here, the channel area of the passage 68 (that is, the area on the XY plane) is larger than the channel area of any portion of the channel space 66 described above.

(Flow of air-dissolved pressurized water)
The flow of the air-dissolved pressurized water in the fine bubble generating nozzle 10 and the accompanying process of forming fine bubbles will be described with reference to FIG. In FIG. 2, the solid arrow indicates the flow path of the air-dissolved pressurized water.

First, air-dissolved pressurized water is introduced into the decompression tube 22 from the outside through the inlet 23 of the nozzle body 20 . The pressure of the air-dissolved pressurized water at this point is greater than the atmospheric pressure.

The air-dissolved pressurized water introduced from the inlet 23 passes through an inlet-side opening 24 having an opening area smaller than that of the inlet 23 . As a result, the flow velocity of the air-dissolved pressurized water increases, and the pressure of the air-dissolved pressurized water is reduced to a pressure lower than the atmospheric pressure (that is, decompression due to the Venturi effect). By reducing the pressure of the air-dissolved pressurized water, the air dissolved in the air-dissolved pressurized water is precipitated to generate air bubbles.

As described above, in this embodiment, the decompression tube 22 is formed so that the passage area increases from the inlet-side opening 24 toward the outlet-side opening 26 . Therefore, while the air-dissolved pressurized water in the decompression pipe 22 decompressed by passing through the entrance-side opening 24 flows through the decompression pipe 22 from the entrance-side opening 24 toward the exit-side opening 26, the air-dissolved pressurized water flow velocity decreases. As a result of the decrease in flow velocity, the pressure of the air-dissolved pressurized water is increased. By increasing the pressure of the air-dissolved pressurized water, some of the air bubbles contained in the air-dissolved pressurized water split into fine air bubbles.

As described above, in this embodiment, the tip of the projecting portion 49 passes through the outlet-side opening 26 and is arranged inside the decompression tube 22 . Therefore, the air-dissolved pressurized water flowing through the decompression tube 22 toward the outlet-side opening 26 collides with the projecting portion 49, and then further collides with the inner surface of the decompression tube 22 near the downstream end 22b. After that, it is discharged from the outlet side opening 26 into the channel space 62 through the channel space 60 . Each time the air-dissolved pressurized water flowing through the decompression pipe 22 continuously collides with the protrusion 49 and the inner surface near the downstream end 22b, the flow velocity of the air-dissolved pressurized water decreases. The pressure of the air-dissolved pressurized water is increased every time the flow velocity of the air-dissolved pressurized water decreases. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

When the air-dissolved pressurized water collides with the projecting portion 49, the air-dissolved pressurized water collides with the inclined portion 49a inclined with respect to the flow direction. That is, the air-dissolved pressurized water that collides with the projecting portion 49 flows along the inclined portion 49a. Therefore, formation of turbulence by the air-dissolved pressurized water colliding with the projecting portion 49 is suppressed. By suppressing the formation of turbulent flow, variation in the size of fine bubbles contained in the air-dissolved pressurized water can be suppressed.

As described above, the channel area of channel space 62 is larger than the channel area of channel space 60 . Therefore, the flow velocity of the air-dissolved pressurized water discharged into the flow path space 62 from the outlet side opening 26 through the flow path space 60 further decreases. This further increases the pressure of the air-dissolved pressurized water. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

Also, the air-dissolved pressurized water discharged into the channel space 62 collides with the disk portion 46 . As a result, the direction in which the air-dissolved pressurized water flows is changed, and the flow velocity of the air-dissolved pressurized water further decreases. The pressure of the air-dissolved pressurized water is further increased, and as a result, some of the bubbles contained in the air-dissolved pressurized water are further split into fine bubbles.

After colliding with the disk portion 46 , the air-dissolved pressurized water passes through the passage 64 and is discharged into the flow passage space 66 . As described above, the flow area of passage 64 is greater than the flow area of any portion of flow space 62 . The channel area of the channel space 66 is larger than the channel area of the passage 64 . Therefore, the flow velocity of the air-dissolved pressurized water discharged into the channel space 66 through the passage 64 further decreases. The pressure of the air-dissolved pressurized water is further increased, and as a result, some of the bubbles contained in the air-dissolved pressurized water are further split into fine bubbles.

Then, the air-dissolved pressurized water discharged into the channel space 66 collides with the front surface 28 a of the flange 28 . As a result, the direction in which the air-dissolved pressurized water flows is changed, and the flow velocity of the air-dissolved pressurized water further decreases. The air-dissolved pressurized water is also further pressurized. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

After colliding with the front surface 28a of the flange 28, the air-dissolved pressurized water passes through the passage 68 and flows out from the outflow port 50 toward the outflow location (such as a bathtub). As described above, the flow area of passage 68 is greater than the flow area of any portion of flow space 66 . The flow rate of air-dissolved pressurized water through passageway 68 is further reduced. As the air-dissolved pressurized water flows out to the outflow location, the flow velocity of the air-dissolved pressurized water further decreases, and the pressure of the air-dissolved pressurized water is further increased. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

By flowing the air-dissolved pressurized water through the microbubble generating nozzle 10 in such a flow path, the air-dissolved pressurized water flowing out to the outflow portion can contain a large amount of microbubbles.

The configuration and operation of the microbubble generating nozzle 10 of this embodiment have been described above. The correspondence relationship between this embodiment and the descriptions in the claims will be described. Air-dissolved pressurized water is an example of "gas-dissolved pressurized water." A combination of the pressure reducing tube 22, the inlet 23, the inlet side opening 24, and the outlet side opening 26 is an example of the "low pressure flow part". A combination of the flow path space 62, the projecting portion 49, and the disk portion 46 is an example of the "first collision chamber." The flow path space 62 is an example of the "first flow path space", and the disk portion 46 is an example of the "first collision wall". The outflow port 50 is an example of the "outflow part". The combination of the flow path space 66 and the front surface 28a of the flange 28 is an example of a "second collision chamber." The flow path space 66 is an example of the "second flow path space", and the front surface 28a of the flange 28 is an example of the "second collision wall".

(Second embodiment)
With reference to FIGS. 5 and 6, the microbubble generating nozzle 100 of the second embodiment will be described, focusing on the differences from the first embodiment. This embodiment is one of the modifications of the first embodiment. In FIGS. 5 and 6, the same reference numerals as those used in FIGS. 1 to 4 denote elements having the same configuration as in the first embodiment. As shown in FIGS. 5 and 6, in this embodiment, the shape of the projecting portion 149 formed on the disk portion 46 of the holder portion 140 is different from that in the first embodiment. In this embodiment, the protruding portion 149 is a columnar protruding member that protrudes rearward from the rear surface of the disc portion 46 . A tip portion of the projecting portion 149 is a flat surface parallel to the disk portion 46 . In this embodiment, the protruding portion 149 does not have an inclined portion.

Since the microbubble generating nozzle 100 of this embodiment also has the same configuration as the microbubble generating nozzle 10 of the first embodiment except for the shape of the projecting portion 149, it is basically the same as the microbubble generating nozzle 10 of the first embodiment. can exhibit the same effect. That is, as shown in FIG. 5, the air-dissolved pressurized water flowing through the decompression tube 22 toward the outlet side opening 26 collides with the projecting portion 149, and then further reaches the downstream end of the decompression tube 22. After colliding further with the inner surface in the vicinity of 22 b , it passes through the channel space 60 and is discharged into the channel space 62 from the outlet side opening 26 . Each time the air-dissolved pressurized water flowing through the decompression tube 22 continuously collides with the projection 149 and the inner surface near the downstream end 22b, the flow velocity of the air-dissolved pressurized water decreases. The pressure of the air-dissolved pressurized water is increased every time the flow velocity of the air-dissolved pressurized water decreases. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

(Third embodiment)
With reference to FIGS. 7 and 8, the microbubble generating nozzle 200 of the third embodiment will be described, focusing on the differences from the first embodiment. This embodiment is also one of the modifications of the first embodiment. In FIGS. 7 and 8 as well, elements having the same configuration as in the first embodiment are indicated using the same reference numerals as those used in FIGS. 1 to 4. FIG. As shown in FIGS. 7 and 8, also in this embodiment, the shape of the projecting portion 249 formed on the disk portion 46 of the holder portion 240 is different from that in the first embodiment. In this embodiment, the projecting portion 249 includes a cylindrical portion 250 that projects rearward from the rear surface of the disk portion 46 and two inclined cylindrical portions 252 that are provided on the sides of the cylindrical portion 250 . have. The columnar portion 250 is a columnar protruding member that protrudes rearward from the rear surface of the disc portion 46 . A tip portion of the cylindrical portion 250 is a flat surface parallel to the disc portion 46 . The two slanted columnar portions 252 are substantially columnar projecting members that are arranged on the sides of the columnar portion 250 and protrude rearward from the rear surface of the disc portion 46 . However, the inclined cylindrical portion 252 is formed to have a smaller diameter than the cylindrical portion 250 . Near the tip of the inclined cylindrical portion 252, when viewed along the direction from the rear to the front (that is, the flow direction of the air-dissolved pressurized water (see the arrow in FIG. 7)), there is an inclination that is inclined with respect to the direction. A portion 252a is formed. In other words, the vicinity of the tip of the inclined columnar portion 252 is formed in a shape that is pointed rearward.

Since the microbubble generating nozzle 100 of this embodiment also has the same structure as the microbubble generating nozzle 10 of the first embodiment except for the shape of the projecting portion 249, it is basically the same as the microbubble generating nozzle 10 of the first embodiment. can exhibit the same effect. That is, as shown in FIG. 7, the air-dissolved pressurized water flowing through the decompression tube 22 toward the outlet side opening 26 collides with the projecting portion 249, and then further reaches the downstream end of the decompression tube 22. After colliding further with the inner surface in the vicinity of 22 b , it passes through the channel space 60 and is discharged into the channel space 62 from the outlet side opening 26 . Each time the air-dissolved pressurized water flowing through the decompression tube 22 continuously collides with the projection 249 and the inner surface near the downstream end 22b, the flow velocity of the air-dissolved pressurized water decreases. The pressure of the air-dissolved pressurized water is increased every time the flow velocity of the air-dissolved pressurized water decreases. As a result, some of the bubbles contained in the air-dissolved pressurized water are further divided into fine bubbles.

When the air-dissolved pressurized water collides with the projecting portion 249, the air-dissolved pressurized water collides with the inclined portion 252a that is inclined with respect to the flow direction. That is, the air-dissolved pressurized water that collides with the projecting portion 249 flows along the inclined portion 252a. Therefore, in this embodiment as well, formation of turbulence by the air-dissolved pressurized water colliding with the projecting portion 249 is suppressed. Therefore, in the present embodiment as well, by suppressing the formation of turbulence, it is possible to suppress the variation in the size of the fine bubbles contained in the air-dissolved pressurized water.

(Fourth embodiment)
The fourth embodiment is also one of the modifications of the first embodiment. In the fourth embodiment, as shown in FIG. 9, the projecting portion 349 formed on the disc portion 46 of the holder portion 340 is formed in a polygonal prism shape. Even when the holder part 340 of the present embodiment is provided, the microbubble generating nozzle can exhibit basically the same effects as those of the first embodiment.

(Fifth embodiment)
The fifth embodiment is also one of the modifications of the first embodiment. In the fifth embodiment, as shown in FIG. 10, the projecting portion 449 formed on the disk portion 46 of the holder portion 440 includes a cylindrical portion 450 and six rib portions 452 formed around it. Prepare. The vicinity of the tip of the cylindrical portion 250 is inclined rearward. Even when the holder part 440 of the present embodiment is provided, the microbubble generating nozzle can exhibit basically the same effects as those of the first embodiment.

Although the embodiments have been described in detail above, these are only examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Modification 1) The opening area of the outlet side opening 26 of the decompression tube 22 may be the same as the total opening area of the two inlet side openings 24 . In this case as well, the flow velocity of the air-dissolved pressurized water in the decompression tube 22 should be reduced from the inlet side opening 24 toward the outlet side opening 26 .

(Modification 2) The partition wall 25 of the decompression tube 22 may be omitted. That is, the decompression tube 22 does not have to be divided into two tube portions.

(Modification 3) In each of the above embodiments, the fine-bubble generating nozzle receives supply of air-dissolved pressurized water in which air is dissolved in water, and precipitates the air in the air-dissolved pressurized water to convert it into fine bubbles. Water containing air bubbles is supplied to the outflow point. Not limited to this, the fine bubble generating nozzle is supplied with gas-dissolved pressurized water in which gas other than air (for example, carbon dioxide gas, hydrogen, etc.) is dissolved in water, and precipitates the gas in the gas-dissolved pressurized water. Instead of microbubbles, water containing the expected microbubbles may be supplied to the outflow point. That is, the "gas" is not limited to air, and may be any gas such as carbon dioxide or hydrogen.

The technical elements described in this specification or in the drawings exhibit technical utility either singly or in various combinations, and are not limited to the combinations described in the claims as filed. In addition, the techniques exemplified in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

10: Microbubble generating nozzle 20: Nozzle body 22: Decompression pipe 22a: Upstream end 22b: Downstream end 23: Inlet 24: Inlet side opening 25: Partition wall 26: Outlet side opening 28: Collar 28a: front surface 40: holder portion 42: outer cylindrical portion 43: step 44: inner cylindrical portion 46: disk portion 48: connecting portion 49: projecting portion 49a: inclined portion 50: outflow port 52: connecting portion 60: channel space 62: Flow path space 64: Passage 66: Flow path space 68: Passage 100: Microbubble generating nozzle 140: Holder part 149: Protruding part 200: Microbubble generating nozzle 240: Holder part 249: Protruding part 250: Cylindrical part 252: Inclined cylindrical portion 252a: inclined portion 340: holder portion 349: projecting portion 440: holder portion 449: projecting portion 450: cylindrical portion 452: rib portion B: screw hole

Claims (5)

A decompression flow part for decompressing gas-dissolved pressurized water in which gas is dissolved in water, comprising a decompression pipe and a decompression pipe provided at an upstream end of the decompression pipe for introducing the gas-dissolved pressurized water into the decompression pipe. the reduced-pressure flow section including an inlet-side opening and an outlet-side opening provided at a downstream end of the reduced-pressure tube for discharging the gas-dissolved pressurized water that has passed through the reduced-pressure tube;
A first collision chamber provided on the downstream side of the reduced pressure flow section,
a first flow channel space having a flow channel area larger than the opening area of the outlet-side opening and allowing the gas-dissolved pressurized water discharged from the outlet-side opening to pass therethrough;
a first collision wall provided in a range facing the outlet-side opening for changing the flow direction of the gas-dissolved pressurized water discharged from the outlet-side opening by colliding with the gas-dissolved pressurized water;
a protruding portion provided on the first collision wall and protruding from the first collision wall toward the outlet side opening;
the first collision chamber having
an outflow part that causes the gas-dissolved pressurized water that has passed through the first collision chamber to flow out to an outflow location;
with
the tip of the protrusion is arranged in the decompression tube through the outlet-side opening;
Fine bubble generation nozzle. A decompression flow part for decompressing gas-dissolved pressurized water in which gas is dissolved in water, comprising a decompression pipe and a decompression pipe provided at an upstream end of the decompression pipe for introducing the gas-dissolved pressurized water into the decompression pipe. the reduced-pressure flow section including an inlet-side opening and an outlet-side opening provided at a downstream end of the reduced-pressure tube for discharging the gas-dissolved pressurized water that has passed through the reduced-pressure tube;
A first collision chamber provided on the downstream side of the reduced pressure flow section,
a first flow channel space having a flow channel area larger than the opening area of the outlet-side opening and allowing the gas-dissolved pressurized water discharged from the outlet-side opening to pass therethrough;
a first collision wall provided in a range facing the outlet-side opening for changing the flow direction of the gas-dissolved pressurized water discharged from the outlet-side opening by colliding with the gas-dissolved pressurized water;
a protruding portion provided on the first collision wall and protruding from the first collision wall toward the outlet side opening;
the first collision chamber having
an outflow part that causes the gas-dissolved pressurized water that has passed through the first collision chamber to flow out to an outflow location;
a second collision chamber provided downstream of the first collision chamber and upstream of the outflow portion;
with
The second collision chamber is
a second flow passage space having a flow passage area larger than that of the first flow passage space and allowing the gas-dissolved pressurized water to pass therethrough after passing through the first collision chamber;
a second collision wall for changing the direction of flow of the gas-dissolved pressurized water by collision of the gas-dissolved pressurized water after passing through the first collision chamber;
A fine bubble generation nozzle. 3. The nozzle for generating microbubbles according to claim 2 , wherein the tip of said projecting portion passes through said outlet side opening and is arranged in said decompression tube. The fine bubble generating nozzle according to any one of claims 1 to 3 , wherein the opening area of the outlet side opening is equal to or larger than the opening area of the inlet side opening. The fine bubble generating nozzle according to any one of claims 1 to 4 , wherein the projecting portion has an inclined portion that is inclined with respect to the flow direction of the gas-dissolved pressurized water when viewed along the flow direction.

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