Fine air bubble generator

Abstract

To provide a fine air bubble generator that can stably contain a large amount of fine air bubbles in running water.SOLUTION: A fine air bubble generator 1 comprises: an outer shell part 10; and a first cylindrical part 20, a plate-like part 30, and a second cylindrical part 40 which are located in the outer shell part 10 along a running water direction in this order. At an end on a water outlet side in the first cylindrical part 20, a bottom plate 22 having a plurality of first running water holes is provided. The plate-like part 30 is provided with a plurality of second running water holes which correspond one-to-one with the first running water holes, and are located coaxially with the first running water holes. Between the bottom plate 22 of the first cylindrical part 20 and the plate-like part 30, a space Q, which communicates with a gas introduction part 50 into which an external gas flows, is provided.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a fine bubble generator that is attached to a discharge port such as tap water and contains fine bubbles in the discharged water.

Background Art

[0002] Since fine bubbles have a small buoyancy in a liquid, they have a long residence time in the liquid. Furthermore, fine bubbles shrink in the liquid and finally burst to generate even smaller nano bubbles. It is known that by containing such fine bubbles in tap water or the like, various functions can be imparted to a liquid such as water.

[0003] For example, it is known that by using water containing a large amount of fine bubbles for washing machine water, shower water, etc., the detergency can be improved. Patent Document 1 discloses a water supply hose for a washing machine and a shower hose equipped with a fine bubble water generator that generates a large number of ultra-fine bubbles.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the structure of existing fine bubble generators, the contact area between running water and air flow is small, and the amount of dissolved gas in water tends to be insufficient. With the fine bubble-containing water obtained using a fine bubble generator having such a configuration, there is a limit to the improvement of cleaning ability.

[0006] Therefore, an object of the present invention is to provide a fine bubble generator that can stably contain a large amount of fine bubbles in running water.

Means for Solving the Problems

[0007] The fine bubble generator according to one aspect of the present invention has a tubular shape extending in an arbitrary axial direction, and an outer shell portion in which one end in the axial direction is a water inlet and the other end is a water outlet. The outer shell portion is provided with a first cylindrical portion, a plate-like portion, and a second cylindrical portion arranged in order along the flowing water direction. In this fine bubble generator, a bottom plate having a plurality of first water flow holes is provided at the end on the water outlet side in the axial direction in the first cylindrical portion, and the plate-like portion is arranged at the end on the water inlet side in the axial direction in the second cylindrical portion. The plate-like portion is provided with a plurality of second water flow holes that correspond one-to-one to the first water flow holes and are arranged coaxially with the first water flow holes. The first water flow holes and the second water flow holes each have a shape that tapers in the flowing water direction. A space communicating with a gas introduction portion into which gas from the outside flows is provided between the bottom plate of the first cylindrical portion and the plate-like portion.

[0008] In the fine bubble generator according to one aspect of the present invention, it is preferable that the diameter of the water inlet of the second water flow hole is larger than the diameter of the water outlet of the first water flow hole.

[0009] In the fine bubble generator according to one aspect of the present invention, a plurality of second convex portions extending toward the bottom plate are provided at the end on the water inlet side in the axial direction of the second cylindrical portion, and a recess into which the second convex portions fit is provided at a position corresponding to the second convex portions on the plate-like portion. A plurality of first convex portions extending toward the plate-like portion are provided at the outer edge of the bottom plate of the first cylindrical portion, and the tip of the first convex portion abuts against the surface of the plate-like portion, so that the axial length of the space may be defined.

[0010] In the fine bubble generator according to one aspect of the present invention, a check valve may be provided in the gas introduction portion.

[0011] In the fine bubble generator according to one aspect of the present invention, a filter component is provided on the water inlet side in the axial direction in the first cylindrical portion, and a net-like portion may be provided in the second cylindrical portion.

[0012] In the fine bubble generator according to one aspect of the present invention, the gas introduction portion may have an air supply pump.

Advantages of the Invention

[0013] According to one aspect of the present invention, it is possible to provide a fine bubble generator capable of stably containing a large amount of fine bubbles in flowing water.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0015] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0016] <First Embodiment> In this embodiment, a fine bubble generator 1 attached to a liquid discharge port such as tap water will be described. The fine bubble generator 1 is used, for example, by being attached to a water supply port of a washing machine, in front of a shower head, etc., and contains fine bubbles in washing machine water, shower water, etc.

[0017] Here, the "fine bubble" means a bubble containing both or either one of microbubbles having a bubble diameter of 1 to 100 micrometers (μm) and ultrafine bubbles (also called nanobubbles) having a bubble diameter of 1 to 999 nanometers (nm).

[0018] In addition, the term "tap water" used in the present application mainly means public "tap water" operated by a waterworks bureau of a local government, a waterworks company that has received a business commission from a local government, a third-sector organization, etc. Further, the "tap water" in the present application shall also include water supplied by a company or organization within a specific area, for example, water supplied for business use or industrial use (including water supplied using groundwater, river water, spring water, etc. as a water source).

[0019] FIGS. 1 and 2 show the appearance of the fine bubble generator 1 according to this embodiment. FIG. 3 shows the internal configuration of the fine bubble generator 1. FIG. 3 is a cross-sectional view of the A-A line portion of the fine bubble generator 1 shown in FIG. 2.

[0020] The microbubble generator 1 mainly includes an outer shell part 10 and a gas introduction part 50. Inside the outer shell part 10, a first cylindrical part 20, a plate-like part 30, a second cylindrical part 40, etc. are included. The outer shell part 10 has a tubular shape extending in an arbitrary axial direction. In the outer shell part 10, one end in the axial direction of the tubular part (the upper side in FIG. 1) serves as the water inlet 11, and the other end (the lower side in FIG. 1) serves as the water outlet 12. In FIGS. 1 and 3, etc., the direction of the water flowing axially inside the outer shell part 10 (the flowing water direction) is indicated by an arrow.

[0021] A male thread 13 is provided at the inlet 11 of the outer shell part 10, and a female thread 14 is provided at the outlet 12. Thereby, when the microbubble generator 1 is arranged in a water supply path of a washing machine or the like, piping connection can be easily performed. Note that the shape of the threads provided at the inlet 11 and the outlet 12 is not limited to this. For example, a female thread may be provided at the inlet 11 and a male thread may be provided at the outlet 12, or both the inlet 11 and the outlet 12 may have the same thread shape.

[0022] The gas introduction part 50 is provided so as to branch laterally from one location on the side surface of the outer shell part 10. FIG. 4 shows a state where the exterior cover 52 of the gas introduction part 50 is removed. In the present embodiment, the gas introduction part 50 extends in a direction orthogonal to the axial direction from the side surface near the substantially central part of the outer shell part 10 extending in the axial direction (specifically, the position where the gas mixing chamber Q exists). Inside the gas introduction part 50, an intake passage forming part 53 for supplying outside air to the gas mixing chamber (space) Q provided between the bottom plate 22 of the first cylindrical part 20 and the plate-like part 30 is provided. In the present embodiment, the intake passage forming part 53 is integrally formed with the outer shell part 10.

[0023] Inside the outer shell portion 10, a first cylindrical portion 20, a plate-like portion 30, and a second cylindrical portion 40 are arranged in this order along the flowing water direction. The water that enters from the inlet 11 of the outer shell portion 10 passes through the first cylindrical portion 20, the plate-like portion 30, and the second cylindrical portion 40, and flows out from the outlet 12. FIG. 5 shows each component (specifically, the first cylindrical portion 20, the plate-like portion 30, the second cylindrical portion 40, the check valve 45, etc.) arranged inside the outer shell portion 10. FIG. 6 shows the internal configuration of the second cylindrical portion 40 and the like. FIG. 7 shows a disassembled state of the first cylindrical portion 20 and the plate-like portion 30.

[0024] On the water inlet side in the axial direction in the first cylindrical portion 20, a filter component 21 is provided. In the present embodiment, the filter component 21 includes two filters, a first filter 21a having a coarser mesh and a second filter 21b having a finer mesh. The first filter 21a and the second filter 21b are arranged in this order along the flowing water direction. The first filter 21a and the second filter 21b are positioned by a leaf spring 26 arranged on the inner wall of the outer shell portion 10.

[0025] By providing such a filter component 21 on the upstream side in the water flow direction with respect to the first cylindrical portion 20, impurities in the water supplied into the first cylindrical portion 20 can be removed, and it is possible to suppress the influence of the impurities on the generation of fine bubbles.

[0026] The first cylindrical portion 20 is disposed inside the outer shell portion 10 while having a sealing property with the inner wall of the outer shell portion 10. The first cylindrical portion 20 has a hollow cylindrical portion and a bottom plate 22. The bottom plate 22 is located at the end on the water outlet side in the axial direction. FIG. 8 shows the configuration of the bottom plate 22 of the first cylindrical portion 20. The bottom plate 22 has a plurality of first water flow holes 23. The first water flow holes 23 have a shape that tapers in the water flow direction. When the flow velocity increases, the water flow becomes faster and passes through the bottom plate 22 and enters the plate-like portion 30. In the space between the bottom plate 22 and the plate-like portion 30 (i.e., the gas mixing chamber Q), negative pressure is generated due to the principle that negative pressure is generated on both sides of the fluid flowing at high speed. Thereby, negative pressure can be generated in the water flowing through the holes. The number of the first water flow holes 23 is not particularly limited, but is the same as the number of the second water flow holes 31 described later. And the first water flow holes 23 and the second water flow holes are vertically (i.e., coaxially) corresponding.

[0027] On the outer edge of the bottom plate 22, a plurality of first convex portions 24 extending toward the plate-like portion 30 are provided. The plurality of first convex portions 24 are arranged at equal intervals from each other. The number of the first convex portions 24 is not particularly limited, but as shown in FIG. 8, for example, three are provided.

[0028] The plate-like portion 30 is disposed at the end on the water inlet side in the axial direction in the second cylindrical portion 40. The plate-like portion 30 is provided with a plurality of second water flow holes 31 that correspond one-to-one with the first water flow holes 23 and are arranged coaxially with the first water flow holes 23 (see FIG. 7). The second water flow holes 31 have a shape that tapers in the water flow direction. More specifically, the maximum diameter of the second water flow holes 31 is larger than the minimum diameter of the first water flow holes 23 (for example, d3 > d2). Thereby, the water flow passes through the first water flow holes 23, and the water ejected toward the second water flow holes 31 can be completely received by the second water flow holes 31 and quickly discharged from the second water flow holes 31. When the water flow quickly moves from the first water flow holes 23 to the second water flow holes 31, negative pressure is generated between the bottom plate 22 and the plate-like portion 30, and thereby, negative pressure can be generated in the water flowing through the holes.

[0029] In addition, a plurality of recesses (notches) 32 are provided on the outer edge of the plate-like portion 30. Each recess 32 is formed at a position corresponding to each of a plurality of second convex portions 43 formed on the second cylindrical portion 40. A plurality of second convex portions 43 provided on the second cylindrical portion 40 are respectively inserted into each recess 32.

[0030] The second cylindrical portion 40 has a large-diameter portion 41 located on the water inlet side and a small-diameter portion 42 located on the water outlet side. A plurality of second convex portions 43 extending toward the bottom plate 22 of the first cylindrical portion 20 are provided at the axial water inlet side end of the second cylindrical portion 40 (that is, the tip of the large-diameter portion 41). The plurality of second convex portions 43 are arranged at equal intervals from each other. The plurality of second convex portions 43 are provided so as to correspond one-to-one with the plurality of recesses 32 provided on the plate-like portion 30. Then, by fitting the second convex portion 43 of the second cylindrical portion 40 into the recess 32 of the plate-like portion 30, the plate-like portion 30 is positioned and fixed with respect to the second cylindrical portion 40.

[0031] A net-like portion 44 is provided inside the second cylindrical portion 40. The net-like portion 44 includes two net portions (that is, the first net portion 44a and the second net portion 44b) arranged in order along the water flow direction (see FIG. 6). By including such two-stage net portions, the generation effect of fine bubbles can be enhanced. The net-like portion 44 is attached to, for example, a step L formed on the inner wall of the large-diameter portion 41.

[0032] A check valve 45 is arranged at the axial water outlet side end of the second cylindrical portion 40 (that is, the end of the small-diameter portion 42). By providing the check valve 45, it is possible to reduce the possibility that internal components are damaged by the backflow force generated when the water flow on the outlet 12 side of the fine bubble generator 1 is blocked.

[0033] Since the first cylindrical portion 20, the plate-like portion 30, and the second cylindrical portion 40 have the above-described configuration, when the bottom plate 22 side of the first cylindrical portion 20 is disposed on the second cylindrical portion 40 to which the plate-like portion 30 is attached, a space is formed between the bottom plate 22 of the first cylindrical portion 20 and the plate-like portion 30. This space becomes a gas mixing chamber Q that communicates with the gas introduction portion 50 (specifically, an intake passage formed by the intake passage forming portion 53).

[0034] The gas introduction portion 50 includes an exterior cover 52 having an intake port 51, an intake passage forming portion 53, a check valve 54, and the like. A screw shape is formed on the inner wall of the exterior cover 52 and the outer wall of the intake passage forming portion 53, and the exterior cover 52 is screw-connected to the intake passage forming portion 53. Thereby, the intake port 51 of the exterior cover 52 and the intake passage in the intake passage forming portion 53 communicate with each other. Then, the outside air flowing in from the intake port 51 is supplied to the gas mixing chamber Q through the intake passage.

[0035] The check valve 54 is disposed in the intake passage forming portion 53. Thereby, it is possible to suppress the water in the gas mixing chamber Q from flowing out to the intake port 51 side when the degree of negative pressure in the gas mixing chamber Q is small or when the inside of the gas mixing chamber Q is a positive pressure.

[0036] When assembling the first cylindrical portion 20, the plate-like portion 30, and the second cylindrical portion 40, for example, after attaching the check valve 45 and each mesh portion 44a, 44b of the mesh-like portion 44 to the second cylindrical portion 40, the plate-like portion 30 is attached to the end portion on the water inlet side. Thereafter, the bottom plate 22 side of the first cylindrical portion 20 is disposed on the end portion on the water inlet side of the plate-like portion 30. At this time, the first convex portion 24 formed on the bottom plate 22 is brought into contact with the surface of the plate-like portion 30. Thereby, a space (that is, the gas mixing chamber Q) having a predetermined interval can be formed between the bottom plate 22 and the plate-like portion 30.

[0037] Since the gas mixing chamber Q is formed between the bottom plate 22 having the first water flow hole 23 and the plate-like portion 30 having the second water flow hole 31, the contact area between the water passing through the outer shell portion 10 and the air supplied from the intake passage of the gas introduction portion 50 can be increased.

[0038] The axial length (height) of the gas mixing chamber Q is defined by the axial lengths (heights) of the first convex portion 24 and the second convex portion 43. This will be described with reference to FIG. 10. FIG. 10 shows a cross-sectional configuration in a state where the first cylindrical portion 20 is disposed on the plate-like portion 30. FIG. 10 is a cross-sectional view of the B-B line portion of the first cylindrical portion 20 and the plate-like portion 30 shown in FIG. 9.

[0039] When the first cylindrical portion 20 is disposed on the second cylindrical portion 40 to which the plate-like portion 30 is attached, alignment is performed so that each first water flow hole 23 and each second water flow hole 31 are coaxially positioned. At this time, the first convex portion 24 and the second convex portion 43 in a state of being fitted into the recess 32 are present at positions shifted from each other (see FIG. 9). Then, the first convex portion 24 is pressed against the upper surface of the plate-like portion 30, and the second convex portion 43 is pressed against the lower surface of the bottom plate 22 of the first cylindrical portion 20 (see FIG. 5).

[0040] Here, if the axial length (height) of the first convex portion 24 is t1 and the thickness of the plate-like portion 30 is t2, it is preferable that the axial length (height) t3 of the second convex portion 43 is t1 + t2 (that is, the sum of the height of the first convex portion 24 and the thickness of the plate-like portion 30). Thereby, the axial length of the gas mixing chamber Q becomes substantially the same value as the axial length (height) t1 of the first convex portion 24. That is, by defining the heights of the first convex portion 24 and the second convex portion 43 in accordance with the thickness of the plate-like portion 30, the axial length of the gas mixing chamber Q can be easily defined. In this way, by bringing the tip of the first convex portion 24 into contact with the surface of the plate-like portion 30, the axial length of the gas mixing chamber Q is defined.

[0041] As described above, when the first cylindrical portion 20, the plate-like portion 30, and the second cylindrical portion 40 are assembled, a plurality of openings J are formed on the outer periphery of the gas mixing chamber Q (see FIG. 5). By forming such openings J, the air supplied from the gas introduction portion 50 can be efficiently supplied into the gas mixing chamber from the periphery of the gas mixing chamber Q. This is advantageous for improving the contact area between the water flow and the air flow in the gas mixing chamber Q.

[0042] In one example, the axial length t1 of the gas mixing chamber Q can be in the range of 0.3 mm or more and 1.5 mm or less. By defining the length t1 in this way, an appropriate amount of fine bubbles can be stably contained in the water obtained by using the fine bubble generator 1.

[0043] Also, as shown in FIG. 8, the first water flow hole 23 and the second water flow hole 31 each have a shape that tapers in the water flow direction. That is, the first water flow hole 23 and the second water flow hole 31 have a structure like a Venturi tube, and are configured to generate a negative pressure in the water flowing through the holes. When the fine bubble generator 1 is used, the amount of dissolved gas in the water can be further improved.

[0044] More specifically, the diameter d3 of the water inlet 31a of the second water flow hole 31 is larger than the diameter d2 of the water outlet 23b of the first water flow hole 23 (that is, d3 > d2), and the diameter d4 of the water outlet 31bb of the second water flow hole 31 is larger than the diameter d2 of the water outlet 23b of the first water flow hole 23 (that is, d4 > d2). Thereby, when the fine bubble generator 1 is used, the amount of dissolved gas in the water can be further improved, and the cleaning ability of the fine bubble-containing water can be further improved.

[0045] (Summary of the First Embodiment) As described above, the fine bubble generator 1 according to the present embodiment includes an outer shell portion 10 having a tubular shape, and a first cylindrical portion 20, a plate-like portion 30, and a second cylindrical portion 40 that are sequentially arranged along the water flow direction inside the outer shell portion 10. A bottom plate 22 having a plurality of first water flow holes 23 is provided at the end of the first cylindrical portion 20 on the water outlet side. The plate-like portion 30 is provided with a plurality of second water flow holes 31 that correspond one-to-one to the first water flow holes 23 and are arranged coaxially with the first water flow holes 23. A space (gas mixing chamber Q) communicating with the gas introduction portion 50 through which gas from the outside flows is provided between the bottom plate 22 of the first cylindrical portion 20 and the plate-like portion 30.

[0046] According to the above configuration, air can be efficiently introduced into the space formed between the bottom plate 22 and the plate-like portion 30 from the side. Therefore, a large amount of fine bubbles can be stably contained in the flowing water in the first cylindrical portion 20 and the second cylindrical portion 40. As a result, the cleaning ability of the fine bubble-containing water obtained by the fine bubble generator 1 can be further improved.

[0047] Further, the first water flow holes 23 and the second water flow holes 31 provided in the fine bubble generator 1 each have a shape that tapers in the water flow direction. That is, the diameter d1 of the water inlet 23a of the first water flow hole 23 is larger than the diameter d2 of the water outlet 23b of the first water flow hole 23 (that is, d1>d2). Also, the diameter d3 of the water inlet 31a of the second water flow hole 31 is larger than the diameter d4 of the water outlet 31b of the second water flow hole 31 (that is, d3>d4).

[0048] According to this configuration, a high-speed water flow can be formed between the bottom plate 22 and the plate-like portion 30. Based on the principle that negative pressure is generated on both sides of the fluid when water flows at high speed, a large amount of air is sucked into the space of the gas mixing chamber Q. Therefore, air can be supplied more efficiently from the gas introduction portion 50 to the gas mixing chamber Q, and the amount of dissolved gas in the fine bubble-containing water generated by the fine bubble generator 1 can be further improved.

[0049] Also, it is preferable that the diameter d3 of the water inlet 31a of the second water flow hole 31 is larger than the diameter d2 of the water outlet 23b of the first water flow hole 23 (that is, d3>d2). Thereby, the amount of dissolved gas in water when the fine bubble generator 1 is used can be further improved, and the cleaning ability of the fine bubble-containing water can be further improved. The magnitude relationship between the diameter d4 of the water outlet 31b of the second water flow hole 31 and the diameter d2 of the water outlet 23b of the first water flow hole 23 is not particularly limited. In one example, as shown in FIG. 10, the diameter d4 of the water outlet 31b of the second water flow hole 31 is larger than the diameter d2 of the water outlet 23b of the first water flow hole 23 (that is, d4>d2).

[0050] The microbubble generator 1 can be attached and used, for example, at the water supply port of a washing machine, in front of a shower head, etc. Thereby, a large amount of fine bubbles can be stably contained in the water for washing machines, shower water, etc.

[0051] When the microbubble generator 1 is attached and used at the water supply part of a washing machine, it is advisable to place the microbubble generator 1 between the faucet of tap water and the water supply hose (see, for example, FIG. 12 of Patent Document 1). Also, when the microbubble generator 1 is attached and used to a shower, it is advisable to place the microbubble generator 1 between the shower head and the water supply hose (water supply pipe) (see, for example, FIG. 14 of Patent Document 1).

[0052] <Second Embodiment> Subsequently, a second embodiment of the present invention will be described. FIG. 11 shows the appearance of the microbubble generator 101 according to the second embodiment. As shown in FIG. 11, the microbubble generator 101 includes a filter cartridge 160.

[0053] Chlorine components are added to tap water to suppress the growth of microorganisms. When tap water contains fine bubbles and is used, for example, as water for washing, there is a possibility of damaging the fabric of clothes and the like due to the influence of the chlorine components contained in the tap water. Therefore, the microbubble generator 101 is provided with a filter cartridge 160 to remove the chlorine contained in the tap water. Inside the filter cartridge 160, for example, a conventionally known filter for chlorine removal is arranged.

[0054] In the present embodiment, the filter cartridge 160 is attached in a form externally attached to the microbubble generator 1 described in the first embodiment. For example, the filter cartridge 160 is screw-connected to the male screw 13 at the water inlet end (inlet 11) of the outer shell part 10.

[0055] In another embodiment, the filter cartridge 160 may be arranged in a form built into the outer shell portion 10. In the fine bubble generator 101, the same configuration as that of the first embodiment can be applied to the components other than the filter cartridge 160.

[0056] According to the fine bubble generator 101 according to this embodiment, fine bubble-containing water in a state where the chlorine component contained in tap water is removed can be obtained. Thereby, it is possible to reduce the adverse effects on the fabric of the laundry that may occur when using the fine bubble-containing water as washing water. In addition, since the progress of deterioration due to the chlorine component of each component in the fine bubble generator 1 can be delayed, the service life of the fine bubble generator 1 can be extended.

[0057] <Third Embodiment> Next, a third embodiment of the present invention will be described. FIG. 12 shows the appearance of a fine bubble generator 201 according to the third embodiment. As shown in FIG. 12, the fine bubble generator 201 further includes a gas supply pump 250 in addition to the filter cartridge 160.

[0058] As shown in FIG. 12, the gas supply pump 250 is attached to the gas introduction portion 50. Specifically, the gas supply pump 250 is arranged on the upstream side of the gas flow path from the check valve 54 arranged in the intake passage forming portion 53. By providing such a gas supply pump 250, the intake air volume in the gas introduction portion 50 can be increased, and the shortage of the negative pressure amount in the gas mixing chamber Q can be compensated. Thereby, the amount of dissolved gas in water when the fine bubble generator 201 is used can be further improved, and the cleaning ability of the fine bubble-containing water can be further improved.

[0059] In the fine bubble generator 201, the same configuration as that of the first embodiment can be applied to the components other than the filter cartridge 160 and the gas supply pump 250. For the filter cartridge 160, the same configuration as that of the second embodiment can be applied.

[0060] The embodiments disclosed this time should be considered illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included. Also, configurations obtained by combining the configurations of different embodiments described in this specification with each other are included in the scope of the present invention.

Explanation of Reference Numerals

[0061] 1: Microbubble generator 10: Outer shell part 11: Water inlet 12: Water outlet 20: First cylindrical part 21: Filter component 22: Bottom plate 23: First water flow hole 23a: Inlet of the first water flow hole 23b: Outlet of the first water flow hole 24: First convex part 30: Plate-like part 31: Second water flow hole 31a: Inlet of the second water flow hole 31b: Outlet of the second water flow hole 32: Depression 40: Second cylindrical part 41: Large-diameter part 42: Small-diameter part 43: Second convex part 44: Mesh part 45: Check valve 50: Gas introduction part 51: Air inlet 53: Air intake passage forming part 54: Check valve 101: Microbubble generator 160: Filter cartridge 201: Microbubble generator 250: Gas supply pump Q: Gas mixing chamber (space)

Claims

1. An outer shell part having a tubular shape extending in an arbitrary axial direction, one end of the axial direction being an inlet of water and the other end being an outlet of water, and a first cylindrical part, a plate-like part, and a second cylindrical part that are sequentially arranged along the flowing water direction inside the outer shell part A fine bubble generator comprising: A bottom plate having a plurality of first water flow holes is provided at the end on the water outlet side in the axial direction in the first cylindrical part, The plate-like part is disposed at the end on the water inlet side in the axial direction in the second cylindrical part, The plate-like part is provided with a plurality of second water flow holes that correspond one-to-one with the first water flow holes and are arranged coaxially with the first water flow holes, The first water flow holes and the second water flow holes each have a shape that tapers in the flowing water direction, A space communicating with a gas introduction part into which gas from the outside flows is provided between the bottom plate of the first cylindrical part and the plate-like part, Fine bubble generator.

2. The diameter of the water inlet of the second water flow hole is larger than the diameter of the water outlet of the first water flow hole, The fine bubble generator according to Claim 1.

3. A plurality of second convex portions extending toward the bottom plate are provided at the end on the water inlet side in the axial direction of the second cylindrical part, and The plate-like part is provided with a recess into which the second convex portion fits at a position corresponding to the second convex portion, A plurality of first convex portions extending toward the plate-like part are provided at the outer edge of the bottom plate of the first cylindrical part, The length of the space in the axial direction is defined by the tip of the first convex portion abutting against the surface of the plate-like part, The fine bubble generator according to Claim 1 or 2.

4. The gas introduction part is provided with a check valve. The fine bubble generator according to Claim 1 or 2.

5. A filter component is provided on the water inlet side in the axial direction in the first cylindrical part, A net-like part is provided inside the second cylindrical part, The fine bubble generator according to Claim 1 or 2.

6. The gas introduction part has an air supply pump, The fine bubble generator according to Claim 1 or 2.

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