JP2022100633A - Shower head and microbubble generator - Google Patents

Abstract

To provide a shower head in which a shower of liquid such as water containing micro-bubbles in high concentration can be obtained easily.SOLUTION: A shower head has a wing type nozzle 40 for generating a swirl flow and a nozzle 50 for breaking a swirl inside of a shower plate 15 of a head part 12. In the nozzle 40, a wing body 42 for generating a swirl flow is fixed in a columnar first hollow part of a first cylindrical body, the wing body being provided with multiple wings 42b in a columnar main body 42a and having a through-hole 42c on a central axis of the main body. The nozzle 50 is provided integrally with the first cylindrical body, and is formed of a second cylindrical body having a columnar second hollow part continuously connected to the first hollow part and a columnar third hollow part having a diameter smaller than that of the second hollow part, in which a side face of a distal side of the third hollow part is vertical to a central axis of the nozzle 50 for breaking the swirl. A gap is present between the side face of the distal side of the third hollow part of the second cylindrical body and an inner surface of the shower plate 15.SELECTED DRAWING: Figure 3

Description

The present invention relates to a shower head and a microbubble generator, and is suitable for application to obtain a shower of water containing microbubbles (microbubbles).

Conventionally, as a micro bubble shower using a micro bubble, a wing-shaped nozzle for generating a swirling flow and a vortex collapse nozzle having a contraction part and a vortex collapse part provided coaxially with the wing-shaped nozzle for generating a swirling flow. Has been proposed to have a shower head in the throat (see Patent Document 1). In this micro-bubble shower, a swirling flow is generated by supplying water to the inlet of a wing-shaped nozzle for generating a swirling flow, and a gas is introduced into the center of the swirling flow, and the gas is introduced into the center of the swirling flow. By supplying the flow to the contraction part, microbubbles are generated from the vortex collapse part, and shower water containing the microbubbles is obtained.

Further, although the airfoil nozzle for generating a swirling flow is not used as in Patent Document 1, a shower head having a structure in which three flat plates are stacked, which also utilizes the eddy collapse phenomenon, has been proposed (Patent Document 1). 2). In this shower head, a microbubble generator (microbubble generator) is provided inside a shower plate having a shower hole inside the head portion. This shower plate acts as a hindrance to the water flowing out of the microbubble generator.

Japanese Unexamined Patent Publication No. 2008-229516 Japanese Unexamined Patent Publication No. 2017-221919

However, since the micro-bubble shower described in Patent Document 1 has a micro-bubble generator including a wing-shaped nozzle for generating a swirling flow and a nozzle for eddying collapse in the throat of the shower head, the tip of the head portion is finally used. The microbubble concentration of the shower water coming out of the shower hole of the shower plate was not very high.

Therefore, the problem to be solved by the present invention is that the shower plate is provided with a microbubble generator composed of a wing-shaped nozzle for generating a swirling flow and a nozzle for eddying collapse inside the shower plate inside the head portion. A shower head that can efficiently generate microbubbles immediately before, thereby easily obtaining a shower of a liquid such as water containing a high concentration of microbubbles, and microbubble generation suitable for use in this shower head. It is to provide the device.

In order to solve the above problems, the present invention
A micro-bubble generator consisting of a swirling flow generating airfoil nozzle and a vortex collapse nozzle provided coaxially with each other is placed inside the shower plate inside the head portion, and the outlet of the vortex collapse nozzle is directed toward the inner surface of the shower plate. Have
In the airfoil nozzle for generating a swirling flow, a plurality of blades are curved in the longitudinal direction of the outer peripheral surface of the cylindrical main body in the first hollow portion of the cylinder of the first cylinder. A wing for swirling flow generation, which is provided and has a through hole on the central axis of the main body, is fixed.
The vortex collapse nozzle is provided integrally with the first tubular body, and has a cylindrical second hollow portion connected to the first hollow portion and the second hollow portion connected to the second hollow portion. A second tubular body having a cylindrical third hollow portion having a diameter smaller than that of the hollow portion 2 and having an end surface on the terminal side of the third hollow portion perpendicular to the central axis of the vortex collapse nozzle. Consists of
It is a shower head having a gap between the end surface on the terminal side of the third hollow portion of the second tubular body and the inner surface of the shower plate.

The details of the swirling flow generating blade of the swirling flow generating blade type nozzle are described in Patent Document 1. The number of blades of the blade body for generating a swirling flow is selected as needed, but is typically 4 or 3. The through hole on the central axis of the main body of the swirling flow generating blade is for supplying air from the rear end of the main body and ejecting air from the front end of the main body, and is typically cylindrical. .. The second hollow portion of the vortex collapse nozzle made of the second cylindrical body is a space (swirl flow generating portion) through which the swirling flow generated by the swirling flow generating airfoil nozzle flows. The air ejected from the outlet of the through hole of the main body of the swirling flow generation blade is taken into this swirling flow, and a bubble is generated. The swirling flow in which the bubbles are generated enters the third hollow portion (vortex collapse portion) connected to the second hollow portion, and the bubbles are miniaturized by the vortex collapse to become microbubbles, and the microbubbles are formed from the third hollow portion. The liquid containing the vortex is released. The micro-bubble liquid released in this way hits the shower plate serving as an obstacle plate and flows radially in the gap between the end surface of the third hollow portion of the second tubular body on the terminal side and the inner surface of the shower plate. Finally, a shower of microbubble liquid is obtained by being ejected from the shower hole of the shower plate. The length of the wing-shaped nozzle for generating swirling flow and the length of the nozzle for vortex collapse are appropriately selected according to the internal size of the head portion in which the microbubble generator is housed, but the length of the space inside the head portion is selected. When the depth is relatively small, for example, about 30 mm, the total length of the wing-shaped nozzle for generating a swirling flow and the nozzle for eddying collapse is selected to be, for example, 25 mm or less. The shower plate acts as an obstacle to the microbubble liquid ejected from the end of the third hollow portion of the second cylindrical body, and contributes to the improvement of the flow rate of the liquid ejected from the shower hole.

In order to improve the efficiency of microbubble generation inside the head portion, it is preferable that the airfoil nozzle for swirling flow generation and the cylindrical air retention coaxial with the central axis of the vortex collapse nozzle are retained on the inner surface of the head portion. The plate is provided so as to surround the microbubble generator and the liquid flowing into the inside of the head portion is supplied to the inlet of the airfoil nozzle for swirling flow generation. For this reason, for example, the air retention plate is not provided in at least a part of the portion where the liquid flows into the inside of the head portion. In this case, the liquid flows into the inside of the head portion through the gap of this portion of the air retention plate.

In addition, this invention
It consists of an airfoil nozzle for generating swirling flow and a nozzle for vortex collapse provided coaxially with each other.
In the airfoil nozzle for generating a swirling flow, a plurality of blades are bent in the longitudinal direction of the outer peripheral surface of the cylindrical main body in the first hollow portion of the cylinder of the first cylinder. A wing for swirling flow generation, which is provided and has a through hole on the central axis of the main body, is fixed.
The vortex collapse nozzle is provided integrally with the first tubular body, and has a cylindrical second hollow portion connected to the first hollow portion and the second hollow portion connected to the second hollow portion. A second tubular body having a cylindrical third hollow portion having a diameter smaller than that of the hollow portion 2 and having an end surface on the terminal side of the third hollow portion perpendicular to the central axis of the vortex collapse nozzle. It is a micro bubble generator consisting of.

In the invention of the micro-bubble generator, the above description in relation to the invention of the shower head is established unless it is contrary to the property thereof.

According to the present invention, a microbubble generator including a wing-shaped nozzle for generating a swirling flow and a nozzle for eddying collapse is provided inside the shower plate inside the head portion, so that the microbubbles can be efficiently generated immediately before the shower plate. It is possible to easily obtain a shower of a liquid such as water containing a high concentration of microbubbles.

It is a front view which shows the shower head by 1st Embodiment of this invention. It is a vertical sectional view which shows the shower head by 1st Embodiment of this invention. It is a vertical cross-sectional view which shows the head part and the peripheral part of the shower head by 1st Embodiment of this invention in an enlarged manner. It is a front view which shows the head part of the shower head by 1st Embodiment of this invention. It is a perspective view which saw the microbubble generator of the shower head by 1st Embodiment of this invention from the nozzle for vortex collapse. It is a perspective view which saw the microbubble generator of the shower head by 1st Embodiment of this invention from the side of the airfoil nozzle for swirling flow generation. It is a perspective view which looked at the head part of the shower head by 1st Embodiment of this invention with the microbubble generator, the shower plate and a ring removed. It is sectional drawing which shows the test article 1 used for the evaluation of the structure of the airfoil nozzle for swirling flow generation, and the nozzle for vortex collapse. It is sectional drawing which shows the test article 2 used for the evaluation of the structure of the airfoil nozzle for swirling flow generation, and the nozzle for vortex collapse. It is sectional drawing which shows the test article 3 used for the evaluation of the structure of the airfoil nozzle for swirling flow generation, and the nozzle for vortex collapse. It is a schematic diagram which shows the relationship between the power of a water flow with respect to the microbubble generator and the pressure of an air supply part obtained by the experiment which performed using the test products 1 to 3. It is a schematic diagram which shows the relationship between the pressure and the flow rate of the water flow with respect to the microbubble generator obtained by the experiment performed using the test products 1 to 3. It is a schematic diagram which shows the relationship between the power of a water flow and the pressure of an air supply part with respect to the microbubble generator obtained by the experiment which performed | changed L to 5 mm and 15 mm using the test product 3. It is a schematic diagram which shows the relationship between the pressure and the flow rate of the water flow with respect to the microbubble generator obtained by the experiment which changed L to 5mm and 15mm using the test product 3. It is sectional drawing which shows the test article 4 which added the baffle plate to the test article 3. It is a schematic diagram which shows the relationship between the power of a water flow with respect to the micro-bubble generator and the pressure of an air supply part obtained by the experiment performed using the test product 4. It is a schematic diagram which shows the relationship between the pressure and the flow rate of the water flow with respect to the microbubble generator obtained by the experiment performed using the test product 4. It is a development view which shows the specific example of the blade of the blade body for the swirling flow generation of the airfoil type nozzle for swirling flow generation. A schematic line showing the relationship between the power of the water flow and the pressure of the air supply unit for the microbubble generator obtained by the experiment conducted using the test product 3 in which the inclination angles θ of the blades were changed to 78 °, 80 °, and 82 °. It is a figure. It is a schematic diagram showing the relationship between the pressure and the flow rate of the water flow with respect to the microbubble generator obtained by the experiment conducted using the test product 3 in which the inclination angle θ of the blade is changed to 78 °, 80 °, and 82 °. .. It is a drawing substitute photograph which shows the state that the microbubble water is ejected with the shower plate removed and attached in the shower head according to an Example. It is a vertical sectional view which shows the head part of the shower head by the 2nd Embodiment of this invention in an enlarged manner. It is a perspective view which shows the head part of the shower head by the 2nd Embodiment of this invention. It is a vertical sectional view which shows the shower head by the 3rd Embodiment of this invention. It is a vertical sectional view which shows the shower head by the 4th Embodiment of this invention.

Hereinafter, embodiments for carrying out the invention (hereinafter referred to as “embodiments”) will be described with reference to the drawings.

<First Embodiment>
[shower head]
1 and 2 show the shower head 1 according to the first embodiment, FIG. 1 is a front view, and FIG. 2 is a vertical sectional view. FIG. 3 is an enlarged vertical sectional view showing the head portion of the shower head 1 and its peripheral portion. As shown in FIGS. 1 to 3, the shower head 1 includes a head portion 10 and an elongated substantially cylindrical handle portion 20. The head portion 10 has a substantially cylindrical connecting portion 11 on the portion on the handle portion 20 side. A male screw 11a is cut on the outer peripheral surface of the tip of the connecting portion 11. A female screw 20a is cut on the inner peripheral surface of one end of the handle 20 on the connecting portion 11 side. Then, the male screw 11a of the connecting portion 11 is screwed into the female screw 20a of the handle portion 20, so that the connecting portion 11, and therefore the head portion 10 and the handle portion 20 are fixed to each other. The hollow portion of the handle portion 20 communicates with the space inside the head portion 10 via the hollow portion of the connecting portion 11. Although these head portions 10 and handle portions 20 are formed separately here, they may be integrally formed. A male screw 20b is cut on the outer peripheral surface of one end on the upstream side of the handle 20. When using the shower head 1, for example, the handle 20 and the hose are connected to each other by screwing the male screw 20b into the female screw cut on the inner peripheral surface of the fixture at one end of the hose connected to the faucet of the water service. To.

The main body 12 of the head portion 10 has a substantially hemispherically curved outer shape. A cylindrical portion 13 is provided at the tip end portion of the main body 12. A male screw 13a is cut on the outer peripheral surface of the cylindrical portion 13. A ring 14 is attached to the cylindrical portion 13 by screwing a male screw 13a of the cylindrical portion 13 into a female screw 14a cut on the inner peripheral surface of the rear portion of the ring 14. The tip of the ring 14 is bent vertically to the central axis side of the ring 14. The shower plate 15 is fitted in the ring 14, and the outer peripheral portion of the shower plate 15 is sandwiched between the bent tip of the ring 14 and the tip of the cylindrical portion 13 of the main body 12, so that the cylindrical portion 13 and the shower It is in close contact with the outer peripheral portion of the plate 15. FIG. 4 shows a front view of the head portion 10. As shown in FIGS. 3 and 4, the shower plate 15 is provided with a large number of shower holes 15a. These shower holes 15a are provided at equal intervals on six concentric circles having different radii around the center of the shower plate 15. The shower plate 15 is used as a baffle plate as described later.

A blade unit 30 made of a tubular body having a step is provided inside the shower plate 15 inside the head portion 10. The airfoil nozzle 40 for generating a swirling flow and the nozzle 50 for vortex collapse are fitted into the blade unit 30 so as to be coaxial with each other, and a microbubble generator 60 is configured. The outer diameter of the blade unit 30 increases in four steps toward the shower plate 15. That is, the blade unit 30 has the first portion 31 of the outer diameter D ₁ and the second portion 32 of the outer diameter D ₂ (> D ₁ ) in order from the rear portion (upstream side) to the front portion (downstream side). , A third portion 33 of the outer diameter D ₃ (> D ₂ ) and a fourth portion 34 of the outer diameter D ₄ (> D ₃ ). The inside of the blade unit 30 has a cylindrical hollow portion 35 having a diameter d ₁ of the inside of the first portion 31 and one half of the second portion 32 in order from the rear portion to the front portion, and the second portion. A cylindrical hollow portion 36 having a diameter d ₂ inside the other half of the portion 32 and one half of the third portion 33, and the other half of the third portion 33 and the fourth portion 34. It consists of a cylindrical hollow portion 37 having a diameter d ₃ inside. The airfoil nozzle 40 for generating a swirling flow is fitted in the hollow portion 36, and the nozzle 50 for vortex collapse is fitted in the hollow portion 37. In this case, the inner diameter of the cylinder 41 of the airfoil nozzle 40 for swirling flow and the inner diameter of the swirling flow generating portion 52 of the vortex collapse nozzle 50 are equal to each other. That is, the cylinder 41 of the airfoil nozzle 40 for generating a swirling flow and the swirling flow generating portion 52 of the nozzle 50 for vortex collapse are straight pipes.

The airfoil nozzle 40 for generating a swirling flow has a blade body 42 for generating a swirling flow integrally provided inside the cylinder 41. The wing body 42 for generating a swirling flow is provided with four blades 42b in the longitudinal direction of the outer peripheral surface of the front portion (downstream side) of the columnar main body 42a at equal intervals in the circumferential direction so that their rear portions are curved. And has a through hole 42c on the central axis of the main body 42a. The diameter of the rear part (upstream side) of the main body 42a is smaller than the diameter of the front part of the main body 42a. The vortex collapse nozzle 50 is provided with a cylindrical swirling flow generating portion 52 on one surface of the disk 51. The disk 51 has a vortex collapse portion 53 having a circular opening in the center. Three positions (120 ° apart from each other) at equal angles with respect to the center of the swirling flow generating portion 52 on the circumference of the disk 51 having a radius larger than the outer shape of the swirling flow generating portion 52 around the center of the swirling flow generating portion 52. A screw hole 51a into which the head of the countersunk screw is inserted is provided at the position). A columnar protrusion 30a is provided in a portion corresponding to the screw hole 51a of the blade unit 30 in contact with the outer periphery of the third portion 33 of the blade unit 30, and a female screw (not shown) is provided at the center of the protrusion 30a. It has been cut. Then, the vortex collapse nozzle 50 is attached to the blade unit 30 by screwing the countersunk screw 38 into the female screw of the protrusion 30a through the screw hole 51a. An annular packing 39 is provided between the outer peripheral portion of the disk 51 of the vortex collapse nozzle 50 and the outer peripheral portion of the shower plate 15, and is sealed.

On the other hand, a shaft 16 is provided coaxially with the airfoil nozzle 40 for generating a swirling flow and the nozzle 50 for vortex collapse on the inner surface of the portion of the main body 12 of the head portion 10 facing the blade unit 30. The tip portion 16a of the shaft 16 is thin, and the tip portion 16a is inserted into a columnar hole 30b provided on the end face on the upstream side of the blade unit 30. An O-ring 71 is provided between the outer peripheral surface of the tip portion 16a and the inner peripheral surface of the hole 30b of the blade unit 30 and is sealed. A through hole 16b is provided on the central axis of the shaft 16, and the diameter of the through hole 16b is smaller at the tip portion 16a than at other portions. The through hole 16b of the tip portion 16a communicates with the through hole 42c of the main body 42a of the swirling flow generating blade 42 of the swirling airfoil nozzle 40. A circular recess 18 is provided in a portion around the through hole 16b of the shaft 16 protruding from the surface of the main body 12 of the head portion 10, and a circular air hole (not shown) is provided in the center of the recess 18. The circular air hole plate 19 is bonded. On the end surface of the blade unit 30 facing the inner surface of the main body 12 of the head portion 10, four inflow holes 30c are provided at positions that do not overlap with the four blades 42b of the blade body 42 for generating a swirling flow. FIG. 5 shows a state in which the micro-bubble generator 60 is viewed from the vortex collapse nozzle 50 side, and FIG. 6 shows a state in which the micro-bubble generator 60 is viewed from the airfoil nozzle 40 side for swirling flow generation.

On the inner surface of the main body 12 of the head portion 10, an air retention plate 12a having a shape in which a portion of a predetermined angle range on the side surface of the cylinder centered on the shaft 16 is cut off is provided. The diameter of the air retention plate 12a is larger than the outer shape of the third portion 33 of the blade unit 30 and smaller than the outer shape of the fourth portion 34, and the tip of the air retention plate 12a is the fourth portion of the blade unit 30. It is in contact with 34. The opening of the air retention plate 12a is provided in a portion of the head portion 10 facing the hollow portion of the connecting portion 11, and the liquid flowing out from the connecting portion 11 flows into the space surrounded by the air retention plate 12a. You can do it. FIG. 7 shows a perspective view of the head portion 10 with the micro-bubble generator 60, the shower plate 15 and the ring 14 removed, as viewed diagonally forward from the right.

As described above, in the shower head 1, microbubbles are generated inside the shower plate 15 inside the head portion 10 by the blade type nozzle 40 for swirling flow generation and the nozzle 50 for vortex collapse fitted in the blade unit 30. Although the device 60 is provided, (1) in the swirl flow generation blade type nozzle 40, a straight tubular swirl flow generation portion 52 of the swirl collapse nozzle 50 is provided on the downstream side of the swirl flow generation blade body 42. (2) The shower plate 15 is provided with a gap between the disk 51 provided with the vortex collapse portion 53 of the vortex collapse nozzle 50 and is used as an obstacle plate, and (3) the swirling flow. The end of the columnar main body 42a of the generating blade 42 on the side where the liquid flows in does not have a streamlined pointed shape (bullet shape) as in Patent Document 1, (4) head portion 10. The air retention plate 12a is provided on the inner surface of the main body 12, and (5) the inclination angle of the blade 42b provided on the columnar main body 42a of the swirling flow generation blade 42 on the vortex collapse nozzle 50 side is set. It is characterized by being optimized. Hereinafter, the reasons for adopting such a structure will be described.

Regarding (1), in order to evaluate the microbubble generator 60 including the airfoil nozzle 40 for swirling flow generation and the nozzle 50 for vortex collapse, three types of test products as shown in FIGS. 8 to 10 were prepared. In the test product 1 shown in FIG. 8, a swirling flow generating blade 210 is provided inside the straight tubular cylindrical portion of the cylinder 200, and a swirling flow generating airfoil nozzle 220 is configured. The swirl flow generating blade 210 has four blades 212 provided in the longitudinal direction on the outer peripheral surface of the bullet-shaped main body 211. In the swirling flow generating portion 230 on the downstream side of the swirling flow generating blade 210, the cylinder 200 has a shape in which the diameter is reduced in a linear taper shape, and a vortex collapse portion 240 made of a straight tubular cylinder is provided behind the cylinder 200. There is. The vortex collapse nozzle 250 is composed of the swirl flow generation unit 230 and the vortex collapse unit 240. At the exit of the vortex collapse portion 240, the cylinder 200 extends perpendicularly to the central axes of the airfoil nozzle 220 for generating a swirling flow and the nozzle 250 for vortex collapse. The test product 2 shown in FIG. 9 is the same as the test product 1 shown in FIG. 8 except that the cylinder 200 of the swirling flow generating portion 230 of the vortex collapse nozzle 250 has a shape in which the diameter is reduced in a concave curve taper shape. .. The test product 3 shown in FIG. 10 corresponds to the airfoil nozzle 40 for swirling flow generation and the nozzle 50 for swirling flow of the shower head 1, and the cylinder 200 of the swirling flow generating portion 230 of the nozzle for swirling collapse 250 is used for swirling flow generation. It has the same diameter as the cylinder 200 of the portion of the wing body 210, and is the same as the test product 1 shown in FIG. 8 except that it has a straight tube shape. Here, the diameter of the cylinder 200 of the portion of the blade body 210 for generating a swirling flow is set to 19 mm. Further, here, the blade body 210 for generating a swirling flow has a shape similar to that of Patent Document 1 having a cannonball shape. FIG. 11 shows the relationship between the power (amount of water × water pressure) when water is sent from the pump to the microbubble generator and the pressure of the air supply part (the pressure of the air supply hole, and therefore the pressure of the air at one end of the air supply tube). It is a figure plotted with respect to the three types of test products 1 to 3 shown in FIG. However, for the test product 3 shown in FIG. 10, plots were made when the length d of the straight pipe portion of the pipe 200 on the downstream side of the swirling flow generating blade 210 was 16 mm or 6 mm. Further, FIG. 12 is a diagram plotting the relationship between the pump pressure (water pressure) and the flow rate for the three types of test products 1 to 3 as in FIG. From FIGS. 11 and 12, the air supply section pressure of the test product 3 (d = 16 mm) shown in FIG. 10 is significantly lower than that of the test products 1 and 2 shown in FIGS. 8 and 9, and the flow rate is reduced. It turns out that is also large. From this result, it can be said that the wake space behind the swirl flow generation blade 210 is important, and that the larger the wake space, the lower the pressure of the wake. The above is the reason why the above-mentioned micro-bubble generator 60 corresponding to the test product 3 shown in FIG. 10 is adopted.

Relatedly, the result of verifying the length L of the straight tubular vortex collapse portion 240 of the vortex collapse nozzle 250 will be described. The length d of the swirling flow generating portion 230 was set to d = 16 mm. FIG. 13 is a diagram plotting the relationship between the power when water is sent from the pump to the microbubble generator and the pressure of the air supply unit in the case of the test product 3 shown in FIG. 10 where L = 5 mm and 15 mm. Further, FIG. 14 is a diagram plotting the relationship between the pressure and the flow rate of the pump when L = 5 mm and 15 mm in the test product 3 as in FIG. 13. However, _d = 15 mm and the diameter De of the vortex collapse portion 240 was set to 5 mm. As can be seen from FIGS. 13 and 14, when the same energy is applied to the microbubble generator, the larger L is, the lower the pressure of the air supply unit is, which is advantageous for the generation of microbubbles.

Regarding (2), FIG. 15 shows the test product 4. The test product 4 is the test product 3 shown in FIG. 10 in which the baffle plate 260 is installed in front of the straight tubular vortex collapse portion 240 of the vortex collapse nozzle 250 with an interval δ. However, _d = 15 mm, L = 15 mm, and De = 4.5 mm. FIG. 16 shows the relationship between the power when water is sent from the pump to the microbubble generator and the pressure of the air supply unit when δ is changed to 0.4 mm, 1 mm, and 2 mm in the test product 4 shown in FIG. It is the figure which plotted the case where 260 is not installed. Further, FIG. 17 is a diagram plotting the relationship between the pressure of the pump and the flow rate in the same case as in FIG. As shown in FIG. 17, the flow rate increases when the baffle plate 260 is installed as compared with the case where it is not installed. Further, as shown in FIG. 16, there is a distance δ at which the decrease in the air supply unit pressure is maximum, and in this case, the decrease in the air supply unit pressure is maximum when δ = 1 mm. When δ = 0.4 mm, the flow rate increases, but the decrease in air supply pressure is halved. The above is the reason why the above-mentioned micro-bubble generator 60 corresponding to the test product 5 shown in FIG. 15 is adopted.

Regarding (3) If a streamlined pointed shape (bullet shape) as in Patent Document 1 is adopted as the main body 42a of the swirling flow generating blade 42, the total length of the swirling flow generating blade nozzle 40 must be lengthened. It is disadvantageous as a micro bubble generator 60 to be incorporated in the shower head 1. Therefore, the above-mentioned micro-bubble generator 60, which does not adopt a streamlined sharp shape as the shape of the main body 42a of the swirling flow generating blade 42, is adopted. However, in the microbubble generator 60, the diameter of the rear portion (upstream side) of the main body 42a of the swirling flow generating blade 42 is made smaller than that of the front portion where the blade 42b is provided, so that the swirling flow generating airfoil The liquid flows smoothly into the nozzle 40 so that the flow loss can be suppressed.

Regarding (4), consider a case where the air retention plate 12a is not provided inside the head portion 10. In this case, the air that had entered the inside of the head portion 10 before the use of the shower head 1 will escape when pressurized after passing water. On the other hand, when the air retention plate 12a is provided inside the head portion 10, the air retention plate 12a acts as a resistance to the flow of air, so that the head portion 10 is used before the shower head 1 is used. The air that has entered the inside of the air stays in the space surrounded by the air retention plate 12a, and becomes difficult to escape when pressurized after passing water. The air that has entered the inside of the head portion 10 dissolves in water by being pressurized after passing water, and when the dissolved water passes through the swirling flow generating blade type nozzle 40, it rebubbles and has a high concentration. Assists in producing microbubble water. Considering that the amount of air atomized by the vortex collapse nozzle 50 is several tens of cc / min, it can be seen that the amount of gas to be pressurized and supplied when the shower is used is significant.

Regarding (5), FIG. 18 is a development view of the outer peripheral surface of the columnar main body 42a of the four blades 42b of the swirling flow generating blade type nozzle 40 of the swirling flow generating blade type nozzle 40 in the circumferential direction. Let θ be the angle of inclination with respect to the circumferential direction at the downstream edge of the blade 42b. The length of the swirling flow generating portion 52 needs to be about D × cot θ, where D is the inner diameter of the cylinder 41, in order not to reduce the efficiency of generating microbubbles. FIG. 19 plots the relationship between the power when water is sent from the pump to the microbubble generator and the pressure of the air supply unit when θ is changed to 78 °, 80 °, and 82 ° in the test product 4 shown in FIG. It is a figure. However, d = 5 mm. Further, FIG. 20 is a diagram plotting the relationship between the pump pressure (water pressure) and the flow rate in the same case as in FIG. As shown in FIGS. 19 and 20, in the nozzle 250 for vortex collapse at θ = 78 °, the pressure in the air supply section is lowered, the water flow resistance is large, and the flow rate is large. The efficiency of microbubble generation is high with respect to the water pressure of.

The dimensions of the main part of the shower head 1 are as follows, for example. The distance between the front surface of the shower plate 15 and the air hole plate 19 of the head portion 10 is 59 mm, the diameter of the ring 14 is 70 mm, the inner diameter of the packing 39 is 44 mm, and the swirl flow generation blade of the swirl flow generation blade type nozzle 40. The diameter of the body 42 and the inner diameter of the swirling flow generating portion 52 of the vortex collapse nozzle 50 are 18 mm, and the length of the swirling flow generating portion 52 is 6 mm. The length of the vortex collapse portion 53 of the vortex collapse nozzle 50 is 3 mm, and the diameter is 3.5 mm. The distance between the end surface of the vortex collapse nozzle 50 on the vortex collapse portion 53 side and the inner surface of the shower plate 15 is 0.4 mm or more and 2 mm or less, for example, about 1 mm.

[Operation of shower head 1]
The operation of the shower head 1 will be described. The handle 20 of the shower head 1 is attached to the attachment at the tip of the hose connected to the faucet of the water supply. Open the tap and let the water (including hot water) flow into the hose. This water flows into the hollow portion of the handle portion 20 through the hose, and further flows into the inside of the head portion 10 through the connecting portion 11 of the head portion 10 of the shower head 1. The water that has flowed into the head portion 10 flows into the hollow portion 35 through the inflow hole 30c provided on the upstream end surface of the blade unit 30 of the microbubble generator 60, and is a blade type nozzle 40 for generating a swirling flow. By passing through, a swirling flow is generated inside the swirling flow generating portion 52 of the vortex collapse nozzle 50, and the vortex collapse occurs in the vortex collapse portion 53 of the vortex collapse nozzle 50, so that the vortex collapse portion 53 contains microbubbles. Water flows out. The introduction of air into the swirling flow in the swirling flow generating portion 52 is performed by the air hole of the air hole plate 19 attached to the surface of the head portion 10, the through hole 16b of the shaft 16, and the main body 42a of the airfoil nozzle 40 for swirling flow generation. It is done through the through hole 42c of. The water containing the microbubbles hits the shower plate 15 provided in front of the vortex collapse nozzle 50 and flows in the direction along the shower plate 15, and finally the water containing the microbubbles is ejected from the shower hole 15a.

[Operation experiment of shower head 1]
A prototype of the shower head 1 was prepared, and an experiment was conducted in which microbubble water was ejected in a transparent acrylic container. 21A and 21B show how the microbubble water is ejected with the shower plate 15 of the shower head 1 removed and attached, respectively.

As described above, according to the shower head 1 according to the first embodiment, the micro bubble generator including the wing-shaped nozzle 40 for swirling flow generation and the nozzle 50 for vortex collapse inside the shower plate 15 of the head portion 10. 60 is provided, and the shower plate 15 acts as a hindrance plate, so that microbubbles can be efficiently generated even under tap water pressure, and water containing the microbubbles or other liquid is ejected from the shower hole 15a of the shower plate 15. Can be made to.

<Second embodiment>
[shower head]
FIG. 22 shows the shower head 1 according to the second embodiment, and is a vertical sectional view showing an enlarged head portion. FIG. 23 is a perspective view of the shower head 1 as viewed diagonally from the rear side. The front view of the main body 12 of the shower head 1 is the same as that of FIG. The shower head 1 according to the second embodiment has a structure in which air is supplied to the through hole 42c of the main body 42a of the airfoil generating blade 42 of the swirling flow generating blade type nozzle 40. different. That is, as shown in FIG. 22, in the shower head 1, instead of providing a shaft 16 having a through hole 16b on the inner surface of the head portion 10, a button bolt 80 with a hexagonal hole is provided in the head portion 10. .. Specifically, a through hole 12b is provided at the rear portion of the head portion 10, and the rubber bush 81 is fixed to the through hole 12b. Then, the button bolt 80 with a hexagon socket is inserted into the rubber bush 81 via the spacer 82. A flat washer 83 and a nut 84 are fitted to the hexagon socket button bolt 80, and the nut 84 is tightened via the flat washer 83 until the rubber bush 81 is compressed. A through hole 80a is provided on the central axis of the button bolt 80 with a hexagonal hole. A hexagonal hole 80b is provided on the head of the button bolt 80 with a hexagonal hole, and a hexagonal air hole plate 85 is provided on the bottom surface of the hexagonal hole 80b. An air hole (not shown) is provided in the center of the air hole plate 85, and the air hole communicates with the through hole 80a of the hexagon socket button bolt 80. The through hole 80a at the tip of the hexagon socket head bolt 80 communicates with the through hole 42c of the main body 42a of the swirling flow generating blade 42. An E-shaped retaining ring 86 is provided at the tip of the hexagon socket button bolt 80 and is in contact with the rear end surface of the blade unit 30. As a result, the hexagon socket button bolt 80 is positioned with respect to the blade unit 30. The configuration of the shower head 1 other than the above is the same as that of the shower head 1 according to the first embodiment.

[How to operate the shower head]
The operation method of the shower head 1 is the same as that of the shower head 1 according to the first embodiment.

According to the second embodiment, the same advantages as those of the first embodiment can be obtained.

<Third embodiment>
[shower head]
FIG. 24 is a vertical sectional view showing the shower head 1 according to the third embodiment. As shown in FIG. 24, the shower head 1 has a microbubble generator 60 similar to that shown in FIG. 10, and the head portion 10 has a cylindrical shape. That is, in the shower head 1, the swirling flow generating blade 42 is provided inside the straight tubular cylindrical portion of the cylinder 300, and the swirling flow generating blade nozzle 40 is configured. A gap is provided between the end of the cylinder 300 and the bottom surface of the head portion 10, and as shown by an arrow in FIG. 24, a liquid such as water flows into the airfoil nozzle 40 for swirling flow through this gap. It is supposed to be supplied. The swirl flow generating blade 42 has four blades 42b provided in the longitudinal direction on the outer peripheral surface of the columnar main body 42a. The cylinder 300 of the swirling flow generating portion 52 of the vortex collapse nozzle 50 has the same diameter as the cylinder 300 of the portion of the swirling flow generating blade 42, and has a straight tube shape. Behind the swirling flow generating portion 52, a vortex collapse portion 53 made of a straight tubular cylinder is provided. The vortex collapse nozzle 50 is configured by the swirl flow generation unit 52 and the vortex collapse unit 53. At the exit of the vortex collapse portion 53, the cylinder 300 extends perpendicularly to the central axes of the airfoil nozzle 40 for generating a swirling flow and the nozzle 50 for vortex collapse. An annular 310 is provided between the outer peripheral surface of the cylinder 300 and the side surface of the head portion 10, and the microbubble generator 60 is fixed to the head portion 10 by the annular 310, and the connecting portion 11 is connected. Water is stopped to prevent the water flowing in through the water from flowing into a portion other than the inlet of the airfoil nozzle 40 for generating a swirling flow. Air is supplied to the through hole 42c of the swirl flow generating blade 42 through an air hole (not shown) provided on the back surface of the head portion 10. A shower plate 15 fitted to a ring (not shown) is attached to the front surface of the head portion 10.

The dimensions of each part of the shower head 1 are selected as needed. For example, the length of the swirling flow generating blade nozzle 40 is 12 mm, and the length of the swirling flow generating part 52 of the vortex collapse nozzle 50 is 5 mm. By setting the length of the vortex collapse portion 53 to 6 mm, the total length of the micro bubble generator 60 can be set to 12 mm + 5 mm + 6 mm = 23 mm, and the total length can be stored in the head portion of a general shower head on the market. It can be 25 mm or less. The width of the gap (inflow portion) between the end of the cylinder 300 and the bottom surface of the head portion 10 is about 5 mm.

[Shower head operation]
The operation method of the shower head 1 is the same as that of the first embodiment.

According to the third embodiment, the same advantages as those of the first embodiment can be obtained.

<Fourth Embodiment>
[shower head]
FIG. 25 is a vertical sectional view showing the shower head 1 according to the fourth embodiment. As shown in FIG. 25, in the shower head 1, a ring for fixing the micro bubble generator 60 to the head portion 10 and stopping water at a portion other than the inlet of the airfoil nozzle 40 for generating a swirling flow. The third embodiment is different from the third embodiment in that the 310 is provided in contact with the outer periphery of the vortex collapse nozzle 50 and the portion of the cylinder 300 that extends perpendicular to the central axis of the cylinder 300. Other things of the shower head 1 are the same as those of the third embodiment.

[Shower head operation]
The operation method of the shower head 1 is the same as that of the first embodiment.

According to the fourth embodiment, the same advantages as those of the first embodiment can be obtained.

Although the embodiments and examples of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments and examples, and various modifications based on the technical idea of the present invention. Is possible.

For example, the numerical values, shapes, structures, arrangements, etc. given in the above-described embodiments and examples are merely examples, and different numerical values, shapes, structures, arrangements, etc. may be used as necessary.

1 ... shower head, 10 ... head part, 11 ... connecting part, 12 ... main body, 12a ... air retention plate, 14 ... ring, 15 ... shower plate, 15a ... shower hole, 16 ... shaft, 16a ... through hole, 20 ... Handle, 30 ... blade unit, 30c ... inflow hole, 40 ... wing nozzle for swirling flow generation, 42 ... wing body for swirling flow generation, 42a ... main body, 42b ... wing, 42c ... through hole, 50 ... for vortex collapse Nozzle, 51 ... disk, 52 ... swirling flow generator, 53 ... vortex collapse part, 60 ... micro bubble generator

Claims (6)

A micro-bubble generator consisting of a swirling flow generating airfoil nozzle and a vortex collapse nozzle provided coaxially with each other is placed inside the shower plate inside the head portion, and the outlet of the vortex collapse nozzle is directed toward the inner surface of the shower plate. Have
In the airfoil nozzle for generating a swirling flow, a plurality of blades are curved in the longitudinal direction of the outer peripheral surface of the cylindrical main body in the first hollow portion of the cylinder of the first cylinder. A wing for swirling flow generation, which is provided and has a through hole on the central axis of the main body, is fixed.
The vortex collapse nozzle is provided integrally with the first tubular body, and has a cylindrical second hollow portion connected to the first hollow portion and the second hollow portion connected to the second hollow portion. A second tubular body having a cylindrical third hollow portion having a diameter smaller than that of the hollow portion 2 and having an end surface on the terminal side of the third hollow portion perpendicular to the central axis of the vortex collapse nozzle. Consists of
A shower head having a gap between the end surface on the terminal side of the third hollow portion of the second tubular body and the inner surface of the shower plate. The shower head according to claim 1, wherein the number of the blades of the airfoil for generating the swirling flow of the airfoil nozzle for generating the swirling flow is 4 or 3. The shower head according to claim 1 or 2, wherein the total length of the airfoil nozzle for generating a swirling flow and the nozzle for vortex collapse is 25 mm or less. On the inner surface of the head portion, a cylindrical air retention plate coaxial with the central axis of the swirling flow generating blade nozzle and the vortex collapse nozzle surrounds the microbubble generator and inside the head portion. The shower head according to any one of claims 1 to 3, which is provided so that the flowing liquid is supplied to the inlet of the airfoil nozzle for generating a swirling flow. The shower head according to claim 4, wherein the air retention plate is not provided in at least a part of a portion where a liquid flows into the inside of the head portion. It consists of an airfoil nozzle for generating swirling flow and a nozzle for vortex collapse provided coaxially with each other.
In the airfoil nozzle for generating a swirling flow, a plurality of blades are curved in the longitudinal direction of the outer peripheral surface of the cylindrical main body in the first hollow portion of the cylinder of the first cylinder. A wing for swirling flow generation, which is provided and has a through hole on the central axis of the main body, is fixed.
The vortex collapse nozzle is provided integrally with the first tubular body, and has a cylindrical second hollow portion connected to the first hollow portion and the second hollow portion connected to the second hollow portion. A second tubular body having a cylindrical third hollow portion having a diameter smaller than that of the hollow portion 2 and having an end surface on the terminal side of the third hollow portion perpendicular to the central axis of the vortex collapse nozzle. Micro bubble generator consisting of.

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