CN111093817A

CN111093817A - Micro-bubble liquid generator

Info

Publication number: CN111093817A
Application number: CN201880055937.5A
Authority: CN
Inventors: 市泽顺一; 伊藤正志
Original assignee: Fuji Keiki KK
Current assignee: Fuji Jiqi Technology Guangdong Co ltd
Priority date: 2017-09-05
Filing date: 2018-08-21
Publication date: 2020-05-01
Anticipated expiration: 2038-08-21
Also published as: CN111093817B; JP2019042700A; JP6960281B2; WO2019049650A1

Abstract

The invention provides a micro-bubble liquid generator which can ensure a sufficient amount of water while ensuring a necessary micro-bubble concentration and preventing a drop in the water pressure of feed water. A water passage pipe (2) connected to a water passage pipe (12) has a bulging portion (4) that is partially expanded in diameter. The bulging portion (4) is provided with a support member (6), and the support member (6) includes an inner ring portion (6a) that holds the nozzle (5) at the inner periphery thereof, an outer ring portion (6b) that is fixed to the bulging portion (4), and a plurality of spoke portions (6c) that connect the inner ring portion (6a) and the outer ring portion (6 b). The water intake plate (7) of the nozzle (5) on the inlet side includes a plurality of water intake holes (8) whose central axis is inclined with respect to the axis of the water supply pipe (2) of the water passage, and tap water discharged obliquely from each water intake hole (8) is ejected toward the second water passage (8b) while spirally swirling the inner wall of the first water passage (8a) at an increased speed. The fine bubble liquid containing numerous extremely fine cavitation bubbles grows due to the sharp pressure drop at this time. The fine bubble liquid merges with tap water passing through between the spokes (6c) opened in the support member (6) without passing through the nozzle (5) and is discharged downstream.

Description

Micro-bubble liquid generator

Technical Field

The present invention relates to a microbubble liquid generator for increasing the number of microbubbles by reducing the size of gas contained in a liquid.

In the present application, the term "gas" refers to not only air but also oxygen, hydrogen, carbon dioxide, etc., and the term "liquid" or "liquid" refers to tap water, groundwater, agricultural water, sewage, wastewater, etc., and in the embodiments of the present invention, an example in which "gas" is air and "liquid" or "liquid" is tap water will be described.

Background

The fine bubbles mean microbubbles or nanobubbles (having a diameter of about 50nm to 500 nm) having a diameter of about 100 μm or less, and the microbubbles having a diameter smaller than pores can effectively remove dirt in pores or sweat glands, and are used in various fields, particularly, in beauty and health. In addition to these uses, the fine bubbles are also used for the purpose of promoting the growth of plants, and the like.

Also, a cleaning effect by an electric action of the fine bubbles is also receiving attention. The surface of the fine bubbles has negative charges, and the bubbles are not joined to each other, and the fine bubbles are diffused and floated in water. On the other hand, dirt caused by oil, sebum, fine foreign matter, and the like is generally positively charged and electrically binds to a negatively charged object to be cleaned. Therefore, when the negatively charged fine bubbles are adsorbed to the positively charged dirt, the bubbles are electrically neutralized, and the dirt is easily separated from the object to be cleaned. In addition, the dirt separated from the object to be cleaned by the electrical neutralization floats up to the water surface by the buoyancy of the bubbles in a state of being adsorbed on the gas-liquid interface of the fine bubbles, and the dirt removed from the object to be cleaned is gradually cleaned in the fine bubble liquid and does not adhere to the object to be cleaned again.

In order to generate a liquid containing such fine bubbles, a high-speed shearing method, a pressure crushing method, a cavitation (cavitation) method, and the like are known, but many of them suck air from the outside by an aspirator (aspirator) method or the like. Or by forced injection of air. For example, patent document 1 discloses a microbubble generator that generates microbubbles by causing cavitation in a sleeve of a mixed fluid containing a liquid accelerated by an accelerating member and a gas (bubbles having a diameter of about several millimeters) introduced into the sleeve (casting) by a gas-liquid mixing member.

Further, patent document 2 discloses a microbubble generation device including: a first nozzle on the inlet side for water passage, the cross-sectional area orthogonal to the central axis of the first nozzle is gradually reduced from the inlet to the outlet; a second nozzle on the outlet side for water passage, which is continuously disposed through a communication path provided to communicate with the outlet of the first nozzle on the inlet side, and whose cross-sectional area perpendicular to the central axis thereof is gradually increased from the inlet to the outlet; and a gap or a side chamber that opens only in the communication path. The microbubble generation device of patent document 2 generates microbubbles from dissolved air in water by a cavitation method without sucking air from the outside.

A shower head (shower head) including a microbubble generator that generates microbubbles from dissolved air in water by a cavitation method is known (see, for example, patent document 3).

Further, a washing machine is known in which washing is performed by jetting microbubbles generated from dissolved air by cavitation from a fluid jet device to laundry in a washing tub (see, for example, patent document 4).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2007-21343

Patent document 2: japanese patent laid-open publication No. 2009-136864

Patent document 3: japanese patent laid-open No. 2016-

Patent document 4: japanese patent laid-open No. 2016-209331

Disclosure of Invention

Problems to be solved by the invention

However, the microbubble generator of patent document 1 is a gas-liquid mixing system that accelerates water accumulated in a tank (tank), and the device of this system is large in size, and is not suitable for a household requiring a simple type of direct connection of water pipes.

The microbubble generation device of patent document 2 adjusts the width of the side chamber in the axial flow direction in accordance with the state of the water channel pressure, but since the side chamber whose size is changed by the adjustment mechanism is provided between the first nozzle and the second nozzle, the configuration of the entire nozzle becomes complicated.

In

patent documents

3 and 4, a flow restrictor is provided in the flow path of tap water, and fine bubbles are generated by cavitation, but the tap water may not be able to secure a necessary amount of water because the tap water passes through the flow restrictor.

In view of the above, an object of the present invention is to provide a microbubble liquid generator capable of supplying a sufficient amount of water to the downstream at the time of supply while ensuring a necessary microbubble concentration.

Means for solving the problems

In order to solve the above problem, the present invention is a microbubble liquid generator disposed in a water path pipe, comprising: a water pipe having a locally expanded diameter bulging portion connected to the water passage pipe at both ends thereof; a nozzle disposed in the projection portion; a support member that holds the nozzle in a direction in which the tap water flows inside the bulging portion; and a water passage unit provided in the support member so as to form a flow path of tap water that does not pass through the nozzle in the bulging unit, the nozzle including: a first water passage, the diameter of which is gradually reduced along the flowing direction of tap water; a second water passage which is communicated with the outlet side of the first water passage and gradually increases in diameter along the flowing direction of tap water; the flow limiting part is used for connecting the first water passage and the second water passage; and a water intake plate provided at an inlet of the first water passage and having a plurality of water intake holes, wherein a central axis of the water intake hole from the inlet side to the outlet side is inclined with respect to a central axis of the water intake plate.

The water passage pipe may be formed by connecting a first pipe body and a second pipe body each having a diameter-expanded portion at opposite ends, and the bulging portion may be formed by joining the diameter-expanded portions of the first pipe body and the second pipe body to each other. In one embodiment of this case, the expanded diameter portion of the first pipe member has an inner diameter larger than an outer diameter of the expanded diameter portion of the second pipe member, and the support member and the expanded diameter portion of the second pipe member are inserted into and joined to the expanded diameter portion of the first pipe member. Alternatively, the expanded diameter portion of the second tube may have an inner diameter larger than an outer diameter of the expanded diameter portion of the first tube, and the support member may be inserted into the expanded diameter portion of the second tube and joined to the expanded diameter portion of the first tube. In addition, the first pipe may include a pressing member that sandwiches the outer ring portion with the second pipe.

In another embodiment, the first pipe and the second pipe are formed by joining pipe joints in a state where the support member is sandwiched between end surfaces of the respective enlarged diameter portions.

In addition, the support member includes: an inner ring portion holding the nozzle at an inner periphery thereof; an outer ring portion fixed to the bulging portion; and a plurality of spokes connecting the inner ring with the outer ring. Therefore, the spoke portions form water passages therebetween, and a flow path of tap water that does not pass through the nozzle is formed.

Another embodiment of the support member comprises: an outer ring portion fixed to the bulging portion; and a plurality of nozzle support portions arranged in a circular array at equal intervals inside the outer ring portion, connected to an inner circumferential wall of the outer ring portion, and each holding the nozzle at an inner circumference. In this case, the plurality of nozzles are disposed in the bulging portion, and the gap between the outer ring portion and the nozzle support portion serves as a water passage portion through which tap water that does not pass through the nozzles flows in the bulging portion, thereby forming a flow path for tap water that does not pass through the nozzles.

Since the water intake holes are formed to be curved from the inlet side toward the outlet side, the water intake holes are twisted, and thus the tap water is introduced into the first water passage as a vortex having a higher rotation rate.

Further, when the concave-convex surface for generating turbulence is formed on the inner surface of the water intake hole, the turbulence of the tap water passing through the water intake hole is increased, and the dissolved air in the tap water is easily taken out, so that cavitation bubbles can be efficiently generated. Similarly, a concave-convex surface for generating turbulence may be formed on an inner surface of the second water passage.

Further, an opening adjusting mechanism for changing the opening area may be provided for each of the water intake holes, and the supply pressure of the tap water supplied to the nozzle may be adjusted to an appropriate value. As an example of an optimum aperture adjustment mechanism, there is an iris diaphragm mechanism formed by overlapping a plurality of flow restricting wings.

ADVANTAGEOUS EFFECTS OF INVENTION

The fine bubble liquid generator of the present invention is configured as follows: since the nozzle is held by the expanded diameter portion of the water passage pipe and the support member forming the water passage portion is disposed, the fine bubble liquid generated by the nozzle and the water passing through the water passage portion are merged again, a sufficient amount of water can be supplied downstream per unit time, and a drop in the water pressure of the supply water passing through the fine bubble liquid generator and a drop in the amount of supply water per unit time can be effectively prevented.

Drawings

Fig. 1 shows a schematic diagram of a household tap water supply system to which the fine bubble liquid generator of the present invention is applied.

Fig. 2 is a side sectional view of the fine bubble liquid generator.

Fig. 3 is a partial side sectional view of a nozzle of the fine bubble liquid generator.

Fig. 4(a) is a plan view of the water-collecting plate, and fig. 4(b) is a side view of the water-collecting plate.

Fig. 5 is an external perspective view of the support member.

Figure 6 is a partial side view of another embodiment of a pipe coupling for connecting pipe bodies.

Fig. 7 is a schematic explanatory view showing a cavitation generation effect in the nozzle.

Fig. 8 shows a modification of the water intake holes of the water intake plate.

Fig. 9 is a perspective view of a nozzle in which the opening area of a water intake hole can be adjusted by using an opening adjustment mechanism.

Fig. 10 is a schematic diagram illustrating a change in the opening area of the inlet of the water intake hole adjusted by the opening adjustment mechanism.

Fig. 11 is a side view of a microbubble liquid generator according to an embodiment in which a plurality of nozzles are arranged in a swelling portion.

Fig. 12 is a plan view of a support member used in the microbubble liquid generator shown in fig. 11.

Fig. 13 is a plan view showing another example of the supporting member for the fine bubble liquid generator shown in fig. 11.

Detailed Description

Embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 schematically shows a tap water supply system of a single-family house or a multi-family house (including office buildings) to which the microbubble liquid generator 1 of the present invention is applied.

The microbubble liquid generator 1 of the individual household 10 is inserted into the water supply pipe 3 with a water meter 11 of tap water, and is disposed downstream of the water meter 11. The water supply pipe 3 is connected to a water passage pipe 12 branched from a water passage header pipe 14 to the single family house 10 via a water stop plug 13. Therefore, the microbubble liquid generator 1 generates a large amount of microbubbles in the tap water flowing through the water meter 11, and the generated microbubble liquid is supplied from the respective waterway plugs 15 in the individual household 10 through the branched water supply pipe 14 branched from the downstream side of the water supply pipe 3.

In the illustrated multi-family house 20, the water receiving tank 15 is provided downstream of the water path pipe 12, the water stop 13, and the water meter 11 in the same manner as described above, and the accumulated water in the water receiving tank 15 is pumped up to the high-level water tank 17 by the pump 16 and stored, and then the tap water is supplied to each family by weight. The microbubble liquid generator 1 at this time is inserted into the water supply pipe 3 of each household together with the sub-water meter 11a, and the microbubble liquid is supplied from each water plug 15.

In addition, in a multi-family house or an office building, there are various types of tap water supply systems from the water passage pipe 12 to the downstream depending on the scale of the building. For example, the following types are available: (1) a type in which a water receiving tank 15 is not provided and water is directly drawn into a high-level water tank 17 by a pump 16 in front of the water meter 11; (2) the type of water drawing in the water receiving tank 15 by a single household using a pump provided for each household; (3) a simple waterway direct connection type identical to that of a single family house; (4) including the types of water receiving tank 15, pump 16 and elevated water tank 17. (4) The type (b) of (c) may be a type supplied from the high-level water tank 17 by natural falling, as in the multi-family house 20 described above, or a type supplied by a pump provided for each family. However, in any type, the microbubble liquid generator 1 is provided after passing through the water meter.

Fig. 2 is a side view of a partial cross section showing the structure of the microbubble liquid generator 1. The microbubble liquid generator 1 includes: a water pipe 2 through which tap water flows in a direction indicated by an arrow; a nozzle 5 disposed in a bulging portion 4 formed in a central portion of the water passage pipe 2; and a support member 6 that holds the nozzle 5 in the bulging portion 4.

The water pipe 2 is formed by connecting a pipe body 2A and a pipe body 2B, and the end portions of the pipe body 2A and the pipe body 2B facing each other are expanded in diameter. The diameter of the expanded diameter portion of the tube body 2B is larger than the diameter of the expanded diameter portion of the tube body 2A, and the expanded diameter portion of the tube body 2A is inserted into the expanded diameter portion of the tube body 2B, and the threads formed on the inner periphery and the outer periphery of each are screwed together and connected. Therefore, when the

pipe bodies

2A and 2B are connected to each other via the enlarged diameter portions, the connecting portions form the bulging portions 4 of the water passage pipe 2.

The ends of the

pipe bodies

2A and 2B opposite to the ends including the enlarged diameter portions are connected to the water supply pipe 3 by pipe connection devices 18, and the tap water passing through the water supply pipe 3 flows in the direction of the arrow. As the pipe connecting device 18, for example, a shell (housing) type pipe joint including a ring-shaped gasket (gasket) fitted over the outer periphery of the end portion of the pipe body to be connected and a pair of shells holding the gasket and having both end portions connected by a fixing member may be used.

Fig. 3 is a side sectional view of the nozzle 5, and includes a first cylindrical portion 5a and a second cylindrical portion 5b, the first cylindrical portion 5a including a bottomed cylindrical body, and a hole portion communicating with the second cylindrical portion 5b being provided on a bottom surface. The side portion of the outer periphery of the circular water intake plate 7 is screwed into the inner periphery of the first cylindrical portion 5a and fitted into the first cylindrical portion 5a, and at this time, the peripheral edge of the water intake plate 7 on the surface side is locked to the bottom surface of the first cylindrical portion 5a surrounding the hole portion. A tapered surface 39 is formed in an annular shape at the water intake side end of the first cylindrical portion 5a to facilitate intake of tap water.

In this example, the water intake plate 7 has a diameter d of, for example, 13.5mm, and a thickness t of, for example, 5mm, and the water intake plate 7 has water intake holes 8, for example, 4 circular holes penetrating in the axial direction, bored in a circular shape at equal intervals on a plane, and the number of the water intake holes 8 may be plural (for example, about 2 to 8). furthermore, as shown in fig. 4(a), the water intake plate 7 has water intake holes 8, for example, 4 circular holes penetrating in the axial direction, bored in a circular shape at equal intervals on a plane, and as shown in a side view of fig. 4(b), the water intake holes 8 are bored in the water intake plate 7 in a slanted columnar shape such that a central axis L extending from the outlet side of tap water is inclined at a predetermined angle α, for example, 15 degrees with respect to a central axis H of the water intake plate 7.

The water intake holes 8 are inclined in the left-hand direction in the figure as indicated by arrows. Thus, the tap water fed in the horizontal direction is discharged in an inclined direction by passing through each of the water intake holes 8, and thus the tap water flow is twisted. Therefore, the water intake plate 7 is screwed to the first cylindrical portion 5a by the left screw in the same rotational direction as the discharged water flow, so that the fastening direction of the screw coincides with the rotational direction of the discharged water flow and does not loosen. In fig. 4(b), only one water intake hole 8 is representatively shown.

The second cylindrical portion 5b of the nozzle 5 is formed with a first water passage 21 having an inner diameter gradually decreasing from the first cylindrical portion 5a to a central portion, a restrictor 22 connected to the first water passage 21, and a second water passage 23 connected to the restrictor 22 and having an inner diameter gradually increasing toward an outlet side.

In this example, the diameter of the nozzle 5 on the inlet side of the first water passage 21 is set to be larger than the diameter of the nozzle on the outlet side of the second water passage 23, and the axial dimensions of the first water passage 21 and the second water passage 23 are set to be longer than the second water passage 8 b. The diameter and length of the inlet of the first water passage 21 are determined by considering various dimensions in order to control the water pressure and the amount of fine bubbles generated, depending on the situation.

The restrictor 22 is provided to communicate the small-diameter-side ends of the first and

second water passages

21, 23 with each other.

As shown in fig. 5, the support member 6 includes: an inner ring portion 6a having an inner diameter equal to the diameter of the outer periphery of the second cylindrical portion 5b of the nozzle 5; an outer ring portion 6B having an outer diameter equal to the inner diameter of the enlarged diameter portion of the tube body 2B; and three spoke portions 6c radially connecting the inner ring portion 6a and the outer ring portion 6b so that the center angles thereof become uniform. The spoke portions 6c serve as water passage portions 11 for tap water passing through the water passage pipe 2.

Further, a male screw 61 that is screwed into the female screw 2a formed on the inner periphery of the diameter-enlarged portion of the pipe body 2B is formed on the outer periphery of the outer ring portion 6B of the support member 6, and a female screw 62 that is screwed into the male screw 51 provided on the outer periphery of the second cylindrical portion 5B of the nozzle 5 is formed on the inner periphery of the inner ring portion 6 a. Therefore, the support member 6 is fixed by screwing with the nozzle 5 inserted into the inner ring portion 6a, and the outer ring portion 6b is screwed into the pipe body 2A, thereby holding the nozzle 5 in the bulging portion 4.

A pressing member 29 for holding the support member 6 is attached to the pipe body 2B along its inner periphery continuously or intermittently by fixing. The pressing member 29 receives the pressure of the tap water, and plays a role of buffering when the supporting member 6 moves to the downstream side in the left direction in the figure, thereby preventing water hammer (water hammer). Such a pressing member 29 includes an elastic member using a spring material, a member having flexibility, or the like.

Further, a male screw 9b that is screwed into a female screw 2A provided on the inner periphery of the enlarged diameter portion of the pipe body 2A is formed on the outer periphery of the circular plate 9, and a female screw 9c that is screwed into a male screw 5c provided on the outer periphery of the second cylindrical portion 5b of the nozzle 5 is formed on the inner periphery of the center hole 9 a. Therefore, the support member 6 in the above example is fixed by screwing the nozzle 5 inserted into the center hole 9a, and the disk 9 is screwed into the pipe body 2A at its outer periphery, thereby holding the nozzle 5 in the bulging portion 4.

Fig. 6 is a side view showing another example of connection of the

pipe bodies

2A and 2B, and in this example, the

pipe bodies

2A and 2B are connected by using the pipe joint 19. Here, the diameters of the respective expanded diameter portions of the

pipe bodies

2A and 2B are equal to each other, and the outer diameter of the support member 6 is also equal to the diameters of the respective expanded diameter portions of the

pipe bodies

2A and 2B. Further, male screws are provided on the outer peripheries of the

pipe bodies

2A, 2B and the support member 6, and when the support member 6 is sandwiched and joined by the

pipe bodies

2A, 2B, these male screws continuously form screw portions that are screwed into female screws provided on the inner periphery of the pipe joint 19. Thus, the pipe joint 19 is fixed in a state in which the end portions of the expanded diameter portions of the

pipe bodies

2A and 2B sandwich the support member 6. At this time, in the case of the support member 6 shown in fig. 2, both side surfaces of the outer ring portion 6B are held by the

pipe bodies

2A and 2B and fixed by the pipe joints 19, and in the case of the support member 6 shown in fig. 3, both side edges of the circular plate 9 are held by the

pipe bodies

2A and 2B and fixed by the pipe joints 19.

In the above configuration, when the tap water reaches the bulging portion 4 of the water passing pipe 2 from the water supply pipe 3, the tap water is branched into a flow path passing through the nozzle 5 and a flow path passing through the water passing portion 11 of the support member 6. The fine bubble liquid is generated from the tap water passing through the nozzle 5, and the generated fine bubble liquid is mixed with the tap water passing through the water passing unit 11 and sent to the water passing pipe 2 downstream. Therefore, by providing the water pipe 2 with the bulge portion 4 to branch the flow of the tap water, the tap water containing the fine bubble liquid can be sent downstream without reducing the amount of water.

At this time, since the flow path of the nozzle 5 is restricted, the tap water flowing through the swelling portion 4 becomes high pressure and the flow velocity increases, and therefore, most of the tap water flowing through the water passage pipe 2 passes through the water passage portion 11. However, if the amount of water passing through the water passage 11 is large, the fine bubbles cannot be maintained at a sufficient concentration when the fine bubbles are mixed with the fine bubble liquid generated by the nozzle 5 downstream. Therefore, it is preferably constituted in the following manner: the amount of water passing through the water passing unit 11 in the swelling unit 4 is about 80% of the total amount, and the rest flows to the nozzle 5. Further, it is preferable that the water flow rate from the water supply pipe 3 to the bulging portion 4 of the water passage pipe 2 is secured to at least 80%.

Here, the action of generating the fine bubble liquid by the nozzle 5 will be described. The tap water passing through each water intake hole 8 of the water intake plate 7 passes through the inclined cylindrical water intake hole 8, and is deviated from the direction of the central axis H of the water intake plate 7, and is discharged in the direction of the central axis L of the inclined water intake hole 8. Therefore, as shown in fig. 4, the tap water passing through the water intake holes 8 turns into a vortex in the same direction as indicated by the arrow, and is introduced into the first water passage 21 of the nozzle 5.

Thus, since the tap water passing through the water intake hole 8 obliquely contacts the inner wall of the first water passage 21, the tap water enters the restrictor 22 while spirally swirling as schematically shown in fig. 7. Further, since the first water passage 21 has a shape in which the inner diameter is narrowed in the flow direction, the first water passage flows toward the restrictor 22 while increasing the swirling speed as it approaches the restrictor 22, and is discharged at high pressure into the second water passage 23 and spreads in the second water passage 23 when passing through the restrictor 22.

Therefore, the tap water undergoes a rapid pressure drop, and numerous fine cavitation bubbles are generated in the second water passage 23 by the boiling phenomenon and released to the pipe body 2B. At this time, the diameter of the nozzle 5 on the inlet side of the first water passage 21 is larger than the diameter of the nozzle on the outlet side of the second water passage 23.

The fine bubble liquid generated from the tap water passing through the nozzle 5 in the pipe body 2B is mixed with the tap water through the water passage portion 11 of the support member 6 without passing through the nozzle 5, and is discharged to the pipe body 2B. At this time, since the diameter of the pipe opening is reduced again when the tap water passes through the enlarged diameter portion of the pipe body 2B, the tap water increases in speed and flows from the pipe body 2B to the downstream water channel pipe.

In this way, if the flow path of the tap water is restricted to generate cavitation bubbles, the pressure loss at the flow restriction portion becomes large, and there is a possibility that a sufficient amount of tap water cannot be supplied downstream per unit time. Therefore, in the fine bubble liquid generator 1 of the present invention, the water passage pipe 2 is provided with the bulging portion 4, and the nozzle 5 is disposed in the bulging portion 4, so that the flow velocity of the tap water is increased by the bulging portion 4 to increase the passing pressure, and the flow is branched into the flow path passing through the water passage portion 11 and the flow path passing through the nozzle 5. After branching, the fine bubble liquid generated by the nozzle 5 and the tap water passing through the water passing unit 11 are merged in the pipe body 2B, whereby a sufficient amount of tap water can be supplied downstream per unit time.

On the other hand, the flow velocity of the tap water is accelerated by providing the bulge portion 4. Usually, tap water is used at 1.5kgf/cm²(0.15MPa) the lower limit of the water pressure is preferably 2.0kgf/cm²To 4.0kgf/cm²(0.2MPa to 0.39MPa), however, if the water pressure is lower than the lower limit water pressure due to the shape of the bulge portion 4, cavitation in the nozzle 5 may not be efficiently performed.

Therefore, in the nozzle 5 of the microbubble liquid generator 1 according to the present invention, the water intake plate 7 provided with the water intake hole 8 is disposed on the inlet side, and the tap water is taken in through the water intake hole 8, thereby increasing the flow rate of the tap water. Further, the shape of the water intake hole 8 is a diagonal cylinder, and the rotation of the tap water passing through the water intake hole 8 is a vortex, thereby further increasing the flow velocity. Accordingly, even if the outer diameter of the bulge portion 4 is large, the flow velocity is increased again when the water is taken into the nozzle 5 by providing a guide (guide) at the water intake port 8, and thus cavitation is efficiently performed.

By forming the water intake hole 8 with the inner wall surface of the hole as the uneven surface 8a as shown in fig. 8(a), the tap water is discharged from the water intake hole 8 while the turbulence is increased. In this example, a plurality of projections are provided to form the uneven surface 8 a. When the turbulence is increased in this manner, the dissolved air in the tap water can be easily taken out, and cavitation bubbles can be efficiently generated in the nozzle 5.

As shown in fig. 8(b), the water intake hole 8 may be formed in a shape in which a bent portion is provided in an oblique cylinder from the inlet side toward the outlet side and a twist is applied thereto. This twists the flow of the tap water at the time point when the tap water passes through the water intake hole 8, and a vortex having a higher rotation rate can be generated by the uneven surface 8 a. At this time, when the inner wall of the water intake hole 8 is formed as the concave-convex surface 8a, the effect of generating cavitation bubbles in the nozzle 5 is further improved by the interaction with the improvement of turbulence.

Further, when the surface of the inner wall of the second water passage 23 of the nozzle 5 is also formed to have irregularities, when the negative pressure is generated, if the diffused fine bubbles further contact the inner wall surface, the fine bubbles are accelerated to be finer, and tap water containing the fine bubbles at a high concentration can be produced.

Further, when the appropriate supply pressure cannot be obtained due to a water path condition caused by a region or a place, or a multi-family house using an overhead water tank, or the like, the opening area of the water intake hole 7 can be adjusted at the time of installation. Fig. 9 is a perspective view showing the nozzle 5 including the water intake plate 7 in which the opening area of the water intake hole 7 can be adjusted by using the opening adjusting mechanism 24. The aperture adjustment mechanism 24 is an aperture that includes an iris diaphragm mechanism and is configured to be able to change the aperture area of the water intake hole 7. The iris diaphragm mechanism is generally known as a diaphragm of a camera lens (camera lens), and as shown in fig. 10 (a) to (d), for example, four kinds of changes are made in the area of the water intake hole 7 by rotating a plurality of restrictor pieces 30 overlapped so that the central opening 25 (water intake hole 7) is substantially circular by driving a gear (not shown). At this time, the gears of each of the shedding mechanisms 24 are configured as follows: the opening areas of the water intake holes 8 can be adjusted to the same size at the same time by rotating and simultaneously driving the diameter adjustment dial 37 provided on the outer periphery of the first cylindrical portion 5a of the nozzle 5.

By providing such an opening adjusting mechanism 24, when the supply pressure of the tap water is low, the opening area of the water intake hole 8 is reduced to increase the supply pressure, and the tap water can be introduced into the nozzle 5, whereby the supply pressure of the tap water to the nozzle 5 can be adjusted to be constant.

The microbubble liquid generator 1 of the above embodiment includes one nozzle 5, but a plurality of nozzles having small diameters may be arranged by providing the swelling portion 4.

Fig. 11 is a partial side view of the fine bubble liquid generator 1A according to the embodiment including three nozzles 31. In the drawings, the same components as those shown in fig. 2 (first embodiment) are denoted by the same reference numerals. That is, the water pipe 2 is formed by connecting a first pipe body 2A and a second pipe body 2B each having a diameter-enlarged portion at opposite ends, and the expanded portions 4 are formed by joining the respective diameter-enlarged portions to each other. Further, the nozzle 31 has the same structure as the nozzle 5, but is reduced in diameter because a plurality of nozzles are used.

Further, similarly to the configuration described in fig. 2, the first pipe 2A is inserted into the second pipe 2B and screwed to form the expanded portion 4 obtained by joining the expanded portions to each other, but at this time, the receiving portion 38 is formed in the second pipe 2B, and the support member 32 is held in the expanded portion 4 by being sandwiched between the receiving portion 38 and the end face of the expanded portion of the first pipe 2A. Further, the pressing member 29 described above is attached to the receiving portion 38, and the pressing member 29 is an elastic member for preventing water hammer by performing a cushioning function when the support member 6 receives the pressure of tap water and moves to the downstream side.

As shown in fig. 12, the support member 32 in the present embodiment includes: an outer ring portion 33 fixed to the bulging portion 4 at a peripheral edge portion thereof by screwing; and three kinds of nozzle support portions 35 arranged in a circular array at equal intervals inside the outer ring portion 33, connected to the inner peripheral wall of the outer ring portion 33 by a connection portion 34, and each holding the nozzle 31 by screwing on the inner periphery. Each nozzle support portion 35 is integrally formed and has a shape extending radially from the center of the outer ring portion 33, and the gap between the outer ring portion 33 and the nozzle support portion 35 is a water passage portion 36 through which tap water that does not pass through the nozzle 31 flows in the expansion portion 4. The center of the support member 32, which coincides with the center of the support member 32, is cut away to form a center hole 36a constituting a part of the water passage portion 36. This ensures that the water permeability of the bulging portion 4 is 80% or more.

In the case of the water passage pipe 2 having a large diameter, as shown in fig. 13, the support member 32A may include four kinds of nozzle support portions 35 to hold the four nozzles 31. Further, the two types of nozzle support portions 35 may be arranged symmetrically with respect to the center hole 36A, and may include two nozzles 31.

In this way, the microbubble liquid generator including the support member 32 and the support member 32A capable of supporting the plurality of nozzles 31 can adjust the number of the nozzles 31 so that the optimum tap water amount and the optimum microbubble liquid concentration can be ensured from the microbubble liquid generator 1, based on the respective conditions such as the ejection force of the microbubble liquid from the nozzles 31, the amount of the microbubbles, and the amount of the tap water passing through the water passing unit 36. Further, the shape of the nozzles 31 may be adjusted by enlarging or reducing the size, not the number of the nozzles 31.

The present invention is not limited to the above embodiment, and various modifications can be made in accordance with the gist of the present invention. For example, when a plurality of water intake holes 8 are required to be provided according to the flow rate of the pipe or the like of the installed tap water, it is preferable that the water intake holes 8 are uniformly arranged on the plane of the water intake plate 7 rather than being arranged at equal intervals in a circular shape.

In the nozzle 5, the diameter of the inlet side of the first water passage 21 is made larger than the diameter of the outlet side of the second water passage 23, and the distance in the center axis direction of the second water passage 23 is made longer in the above embodiment, but the two may be reversed, or the two may be formed in a shape symmetrical with the restrictor 22 as the center and having the same diameter. What is important is that it is set in the following way: the cavitation bubbles of high quality can be generated in an appropriate amount and as fine bubbles based on the relationship between the pressure of the tap water discharged from the first water passage 21 and the pressure reduced by diffusion in the second water passage 23.

Further, the nozzles 5 may be arranged in series with a certain interval therebetween in order to generate fine bubbles with higher efficiency.

As described above in detail, the microbubble liquid generator is configured such that: since the nozzle is held by the expanded diameter portion of the water passage pipe and the support member forming the water passage portion is disposed, the fine bubble liquid generated by the nozzle and the water passing through the water passage portion are merged again, a sufficient amount of water can be supplied downstream per unit time, and a drop in the water pressure of the supply water passing through the fine bubble liquid generator and a drop in the amount of supply water per unit time can be effectively prevented.

Description of the symbols

1: micro-bubble liquid generator

1A: micro-bubble liquid generator

2: water pipe

2A: a first pipe body

2B: second tube

4: bulge part

5: nozzle with a nozzle body

6: supporting member

6 a: inner ring part

6 b: outer ring part

6 c: spoke part

7: water fetching plate

8: water taking hole

12: waterway piping

21: first water passage

22: flow restriction part

23: second water passage

24: opening adjusting mechanism

29: extruded member

32: supporting member

33: outer ring part

35: nozzle support

Claims

1. A microbubble liquid generator disposed in a water path pipe, comprising:

a water pipe having a locally expanded diameter bulging portion connected to the water passage pipe at both ends thereof;

a nozzle disposed in the projection portion;

a support member that holds the nozzle in a direction in which the tap water flows inside the bulging portion; and

a water passage part provided in the support member so as to form a flow path of tap water that does not pass through the nozzle in the swelling part,

the nozzle includes:

a first water passage, the diameter of which is gradually reduced along the flowing direction of tap water;

a second water passage which is communicated with the outlet side of the first water passage and gradually increases in diameter along the flowing direction of tap water;

the flow limiting part is used for connecting the first water passage and the second water passage; and

a water intake plate which is arranged at the inlet part of the first water passage and is provided with a plurality of water intake holes,

the central axis of the water intake hole from the inlet side to the outlet side is inclined with respect to the central axis of the water intake plate.

2. The micro-bubble liquid generator according to claim 1,

the water pipe is formed by connecting a first pipe body and a second pipe body having respective diameter-expanded portions at opposite ends, and the bulging portion is formed by joining the diameter-expanded portions of the first pipe body and the second pipe body to each other.

3. The micro-bubble liquid generator according to claim 2,

the inner diameter of the enlarged diameter portion of the first tube is larger than the outer diameter of the enlarged diameter portion of the second tube, and the support member and the enlarged diameter portion of the second tube are inserted into the enlarged diameter portion of the first tube and joined together.

4. The micro-bubble liquid generator according to claim 2,

the first pipe and the second pipe are joined by a pipe joint in a state where the support member is sandwiched between end surfaces of the respective diameter-enlarged portions.

5. The micro-bubble liquid generator according to claim 1,

the support member includes:

an inner ring portion holding the nozzle at an inner periphery thereof;

an outer ring portion fixed to the bulging portion; and

a plurality of spoke portions connecting the inner ring portion with the outer ring portion.

6. The micro-bubble liquid generator according to claim 5,

the water pipe is formed by connecting a first pipe body and a second pipe body which are provided with expanding parts at opposite ends respectively,

wherein the diameter-expanded portion of the first tube or the second tube has an inner diameter larger than an outer diameter of the diameter-expanded portion of the second tube or the first tube, and the second tube or the diameter-expanded portion of the first tube is inserted into the diameter-expanded portion of the first tube or the second tube and joined to the first tube,

the outer periphery of the outer ring portion of the support member is fixed to the inner periphery of the first pipe body or the second pipe body together with the outer periphery of the second pipe body or the first pipe body.

7. The micro-bubble liquid generator according to claim 6,

the first pipe or the second pipe includes: and the extrusion component and the second pipe body or the first pipe body clamp the outer ring part.

8. The micro-bubble liquid generator according to claim 5,

the first pipe and the second pipe are joined together by a pipe joint in a state in which the peripheral edges of the surfaces on both sides of the outer ring portion are sandwiched between the end surfaces of the respective diameter-expanded portions.

9. The micro-bubble liquid generator according to claim 1,

the support member includes:

an outer ring portion fixed to the bulging portion; and

and a plurality of nozzle support portions arranged in a circular array at equal intervals inside the outer ring portion and connected to an inner circumferential wall of the outer ring portion, each of the nozzle support portions holding the nozzle at an inner circumference.

10. The micro-bubble liquid generator according to claim 1,

the water taking holes are arranged in a plurality at equal intervals in a circle shape.

11. The micro-bubble liquid generator according to claim 1,

the inner surface of the water taking hole is provided with a concave-convex surface for generating turbulent flow.

12. The micro-bubble liquid generator according to claim 1,

an uneven surface for generating turbulence is formed on an inner surface of the second water passage.

13. The micro-bubble liquid generator according to claim 1,

the water intake hole is formed to be curved from an inlet side toward an outlet side of tap water.

14. The micro-bubble liquid generator according to claim 1,

an opening adjusting mechanism for making the opening area variable is included for each of the water taking holes.

15. The micro-bubble liquid generator of claim 14,

the opening adjusting mechanism is an iris diaphragm mechanism formed by overlapping a plurality of flow limiting wings.