JP6526518B2 - Fine bubble generating device and fine bubble generating system - Google Patents

Description

  The present invention relates to a microbubble generator and a microbubble generation system that generate microbubbles in water.

  At present, in order to raise the concentration of dissolved oxygen in water in aquaculture farms and live salmon, etc., micro bubbles which are bubbles having a particle diameter of about several tens of μm are generated in water by a micro bubble generator to dissolve bubbles in water. Technology is known. As a micro-bubble generator used for such a technique, a technique using a method such as a so-called reduced pressure deposition method, an ultrasonic method, and a two-layer swirl flow method is known.

  However, in these methods, the configuration of the microbubble generator becomes complicated, and the microbubble generator becomes large in size, and there is a problem that the manufacturing cost increases.

  Therefore, there is known a micro-bubble generator that stabilizes the cell particle size and the cell distribution with a simple configuration (see, for example, Patent Document 1). This micro-bubble generator sucks gas from the intake pipe connected to the main body by making the water pressure of the water pumped by the pump negative in the main body, mixes the water and the gas, and the mixed water Crush the air bubbles to generate fine air bubbles. Further, in order to make the water pressure negative in the main body, the micro-bubble generator is provided with a cylindrical flow path after the flow path which is reduced in a truncated cone shape in the main body, and the diameter is expanded to the secondary side A chamber is provided, and an intake pipe is connected to the chamber, thereby forming an ejector that generates negative pressure in the chamber to which the intake pipe is connected.

JP 2008-86868 A

  The above-described microbubble generator has the following problems. That is, since the micro-bubble generator is used in aquaculture farms, live fish cages and the like, a further increase in the amount of bubble generation is required. The technology disclosed in Patent Document 1 is configured to absorb the gas by applying a negative pressure, and therefore, in order to increase the amount of bubbles generated, it is necessary to increase the amount of absorption of the gas. Here, the amount of gas suction increases in proportion to the flow rate passing through the nozzle.

  For this reason, in order to increase the generation amount of the fine bubbles, it is necessary to increase the discharge flow rate of the pump. However, in order to increase the generation amount of fine bubbles, it is necessary to enlarge the output of the pump and to increase the rotational speed of the motor. As a result, in order to increase the amount of air bubbles generated, the size of the pump may increase and the manufacturing cost may increase, and the running cost of the micro air bubble generating device may increase.

  Then, an object of this invention is to provide the micro-bubble generator and micro-bubble generation system which can make the suction amount of gas increase by simple structure.

  In order to solve the problems and achieve the object, the micro-bubble generating device and the micro-bubble generating system of the present invention are configured as follows.

  As one aspect of the present invention, the micro-bubble generating device includes a tapered portion whose inner diameter gradually decreases, a nozzle portion provided on the secondary side of the tapered portion, and whose inner diameter is formed the same diameter, the tapered portion, and the nozzle A body having an enlarged diameter portion provided on an end face opposite to the flow direction of water provided between the portions and the secondary side of the nozzle portion and having an inner diameter larger than that of the nozzle portion; An intake pipe connected to a diameter portion, a diffuser provided to the enlarged diameter portion, and a crushing member provided at an end portion of the enlarged diameter portion and having crushing means for crushing gas sucked from the intake pipe And.

  As one aspect of the present invention, the microbubble generation system includes a tapered portion whose inner diameter gradually decreases, a nozzle portion provided on the secondary side of the tapered portion, and whose inner diameter is formed with the same diameter, the tapered portion, and the nozzle A body having an enlarged diameter portion provided between an end face facing in the flow direction of water provided between the parts and a secondary side of the nozzle part and having an inner diameter larger than that of the nozzle part, the enlarged diameter An intake pipe connected to the part, a diffuser provided to the enlarged diameter part, and a crushing member provided at an end of the enlarged diameter part and having a crushing means for crushing gas sucked from the intake pipe And a pump device connected to the primary side of the body.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the micro-bubble generator and micro-bubble generation system which can increase the suction amount of gas by easy structure.

Explanatory drawing which shows the structure of the micro bubble generation system which concerns on one Embodiment of this invention. Sectional drawing which shows the structure of the micro bubble generation apparatus used for the micro bubble generation system. Sectional drawing which expands and shows the principal part structure of the micro-bubble generator. Explanatory drawing which shows an example of the measurement result of the inhalation | air-intake amount of the micro-bubble generator. Sectional drawing which shows the structure of the micro-bubble generator which concerns on other embodiment of this invention.

Hereinafter, a micro-bubble generating system 1 using the micro-bubble generating device 11 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the micro-bubble generation system 1 includes a pump device 10, a micro-bubble generator 11 connected to the secondary side of the pump device 10, and a discharge connecting the pump device 10 and the micro-bubble generator 11. The piping 12 is provided. The micro-bubble generation system 1 is a device for supplying micro-bubbles to the water tank such as the water of the aquaculture farm or the live-fish bowl. In the present embodiment, the micro-bubble generation system 1 will be described using a micro-bubble generator 11 in the water tank 100 storing the seawater 101.

  The pump device 10 is, for example, a pump in which a motor and a pump are integrally connected and disposed adjacent to the water tank 100. A discharge pipe 12 is connected to the discharge port of the pump device 10. The pump device 10 is connected to the micro bubble generator 11 via the discharge pipe 12.

  As shown in FIGS. 1 and 2, the micro-bubble generator 11 includes a body 21, a diffuser 22 attached to the body 21, a crushing member 23 attached to the body 21, and an intake pipe connected to the body 21. And 24.

  As shown in FIG. 2, the body 21 is formed in a tubular shape formed with different inner diameters. The body 21 is called a so-called jet body and constitutes an ejector. The body 21 is formed of a metal material such as stainless steel.

  The body 21 includes an inflow port 31, a tapered portion 32, a nozzle portion 33, and an enlarged diameter portion 34 from one end side to the other end side. As shown in FIGS. 2 and 3, the body 21 has a cylindrical stepped portion 35 between the tapered portion 32 and the nozzle portion 33.

  The body 21 is formed such that the crushing member 23 can be attached to the end face on the enlarged diameter portion 34 side. For example, the body 21 is formed with a plurality of female screw portions that are screwed with the fastening member 99 such as a screw to which the crushing member 23 is attached. Further, the body 21 has a mounting portion 36 for mounting the intake pipe 24 at a position facing the enlarged diameter portion 34, which is a part of the outer surface thereof.

  The inlet 31 is connected to the discharge pipe 12. The inflow port 31 has, for example, a female screw portion 31 a screwed with the discharge pipe 12 on the inner peripheral surface thereof.

  The tapered portion 32 forms a channel having a circular cross section whose diameter gradually decreases from the inlet 31 toward the secondary side. In other words, the tapered portion 32 is a truncated cone-shaped opening whose diameter gradually decreases from the inlet 31 toward the nozzle portion 33.

  The nozzle portion 33 is a cylindrical opening having a constant inner diameter. The nozzle portion 33 is connected to an end portion of the tapered portion 32 and forms a channel having a circular cross section formed with a constant inner diameter over the entire length.

  The enlarged diameter portion 34 is formed on the secondary side of the nozzle portion 33, and a cross section formed larger in diameter than the nozzle portion 33 constitutes a circular chamber (space). In other words, the enlarged diameter portion 34 is a cylindrical opening having a diameter different from that of the nozzle portion 33 and having two different inner diameters.

  Specifically, the enlarged diameter portion 34 includes a first enlarged diameter portion 34a disposed adjacent to the nozzle portion 33, and a second enlarged diameter portion 34b provided on the secondary side of the first enlarged diameter portion 34a. And.

  The first enlarged diameter portion 34 a has an inner diameter that is larger than the inner diameter of the nozzle portion 33. A communication hole 34c communicating with the mounting portion 36 is formed in a part of the inner circumferential surface of the first enlarged diameter portion 34a.

  The second enlarged diameter portion 34 b has an inner diameter that is larger than the inner diameter of the first enlarged diameter portion 34 a. The open end of the second enlarged diameter portion 34 b constitutes an open end of the body 21.

  The stepped portion 35 constitutes an end surface 35 a facing the inflow port 31 between the tapered portion 32 and the nozzle portion 33, in other words, an end surface 35 a disposed in a direction opposite to the water flow direction. The stepped portion 35 is, for example, a cylindrical groove provided between the tapered portion 32 and the nozzle portion 33 by countersinking the end of the tapered portion 32 on the nozzle portion 33 side. The outer diameter of the end face of the stepped portion 35 is formed, in other words, the inner diameter thereof is larger than the inner diameter of the nozzle portion 33.

  The attachment portion 36 is an opening provided with a female screw portion 36 a on the inner peripheral surface. The mounting portion 36 communicates with the first enlarged diameter portion 34 a by arranging the communication hole 34 c on the end surface thereof.

  Such a body 21 forms a water flow path by the inflow port 31, the tapered portion 32, the nozzle portion 33 and the enlarged diameter portion 34. Further, the body 21 has an ejector function of making the water pressure in the enlarged diameter portion 34 a negative pressure lower than the atmospheric pressure by increasing the flow velocity by the tapered portion 32 and the nozzle portion 33.

  The diffuser 22 has a first cylindrical portion 41 formed in a cylindrical shape, and an annular plate-shaped first flange portion 42 formed on the outer peripheral surface of one end of the first cylindrical portion 41. There is. The inner diameter of the first cylindrical portion 41 is larger than the inner diameter of the nozzle portion 33.

  The outer diameter of the first cylindrical portion 41 is smaller than the inner diameter of the first enlarged diameter portion 34a. The outer diameter of the first cylindrical portion 41 is formed to be a diameter that can form a predetermined gap forming the gas flow path with the inner diameter of the first enlarged diameter portion 34a. Further, the first cylindrical portion 41 has a chamfered portion 41a in which the ridge portion between the inner peripheral surface on the side of the first flange portion 42 and the end surface is inclined at 45 ° with respect to the axial direction, for example.

  The outer diameter of the first flange portion 42 is formed to be substantially the same as or slightly smaller than the inner diameter of the second enlarged diameter portion 34 b. The first flange portion 42 can be separated from the end surface of the first enlarged diameter portion 34a when the first cylindrical portion 41 is disposed in the first enlarged diameter portion 34a, with a predetermined gap The thickness of the second enlarged diameter portion 34 b can be abutted with the end surface of the second enlarged diameter portion 34 b.

  In other words, the diffuser 22 is formed in such a shape that the first cylindrical portion 41 is separated from the first enlarged diameter portion 34a when the first flange portion 42 abuts on the end face of the second enlarged diameter portion 34b.

  The crushing member 23 includes a second cylindrical portion 51 formed in a cylindrical shape, and a second flange portion 52 covering one end of the second cylindrical portion 51.

  The outer diameter of the second cylindrical portion 51 is larger than the inner diameter of the second enlarged diameter portion 34b, and the inner diameter is larger than the inner diameter of the first enlarged diameter portion 34a. The length from the second flange 52 to the end of the second cylindrical portion 51 is substantially the same as the length from the end face of the second enlarged diameter portion 34b to the end face of the diffuser 22 provided in the enlarged diameter portion 34 Is formed. In other words, when the crushing member 23 is fixed to the body 21, the end of the second tubular portion 51 abuts the diffuser 22, for example, to restrict the axial movement of the diffuser 22.

  The second flange 52 is fixed to the body 21 by the fastening member 99. The second flange portion 52 includes a plurality of screws 61 whose tips are disposed in the internal space of the second cylindrical portion 51, and a plurality of openings 62 communicating with the internal space of the second cylindrical portion 51. . Only one opening 62 is shown in FIG. The screw 61 has a tip formed at an acute angle. The screw 61 is a crushing means for crushing air bubbles with its tip to form fine air bubbles. The opening 62 constitutes a discharge port of the micro-bubble generator 11.

  The intake pipe 24 includes a connection portion 71 formed at one end and an intake valve 72 formed at the other end. The intake pipe 24 is, for example, a flexible tube.

  The connection portion 71 has a male screw portion formed on the outer peripheral surface thereof and is fixed to the body 21 by screwing with the female screw portion 36 a of the attachment portion 36. The connection portion 71 causes the flow passage in the intake pipe 24 to communicate with the first enlarged diameter portion 34 a via the communication hole 34 c.

  The intake valve 72 is formed to be capable of adjusting the amount of intake of air. The intake valve 72 is disposed at least above the water surface.

  According to the micro bubble generation system 1 configured as described above, when water is supplied to the micro bubble generation device 11 by driving the pump device 10, the water passes through the taper portion 32 and the nozzle portion 33. , Move to the enlarged diameter portion 34.

  At this time, the water moves from the tapered portion 32 to the nozzle portion 33 to increase the flow velocity. Due to the change in the flow passage diameter and the change in the flow velocity, the water pressure becomes negative pressure lower than the atmospheric pressure in the first enlarged diameter portion 34a. Therefore, air is sucked into the first enlarged diameter portion 34 a through the intake pipe 24.

  Thereafter, the air bubbles of the sucked air are mixed with the water while being diffused, pass through the diffuser 22 and move to the crushing member 23. When the air bubbles collide with the tip of the screw 61, the air bubbles are crushed and the water containing the air bubbles moved to the crushing member 23 is miniaturized. Thereafter, the finely divided air bubbles and water are discharged from the opening 62, and the air bubbles are supplied to the seawater 101 in the water tank 100.

  According to the micro-bubble generator 11 configured in this way, the intake amount is increased by providing the end face 35a that inhibits the flow of water by forming the step 35 between the taper 32 and the nozzle 33. It is possible to

  Next, as shown by a two-dot chain line in FIG. 3, the fine air bubble generating device 11 having the end face 35a which is the embodiment and the fine air bubble generating device which does not have the step portion 35 which is the comparative example The measurement result of the inspiratory flow when the amount is measured will be described with reference to FIG.

  The micro-bubble generator of the comparative example has the same size and shape as the micro-bubble generator 11 except for the configuration without the stepped portion 35. Further, as a method of measuring the intake amount, as shown in FIG. 1, the water flow rate detection device 200 is disposed in the discharge pipe 12 between the pump device 10 and the micro bubble generation device 11 to measure a predetermined intake amount. The flow rate was detected. Further, the intake valve 72 shown in FIG. 1 was removed to arrange the flow rate detection device, and the intake amount was detected.

  The relationship between the amount of intake air and the flow rate of water of the micro-bubble generator 11 of the example and the micro-bubble generator of the comparative example measured under such conditions is as follows.

  The flow rate when the intake amount is 0.5 L / min is 25.3 L / min in the micro-bubble generator 11 of the embodiment, and 30.4 L / min in the micro-bubble generator of the comparative example. there were.

  The flow rate when the intake amount is 0.8 L / min is 26.1 L / min in the micro-bubble generator 11 of the embodiment, and 31.8 L / min in the micro-bubble generator of the comparative example. there were.

  The flow rate at an intake amount of 1.0 L / min is 26.7 L / min in the micro-bubble generator 11 of the embodiment, and 32.7 L / min in the micro-bubble generator of the comparative example. there were.

  The flow rate when the intake amount is 3.0 L / min is 32.4 L / min in the micro-bubble generator 11 of the embodiment, and 43.0 L / min in the micro-bubble generator of the comparative example. there were.

  The flow rate when the intake amount is 5.0 L / min is 36.2 L / min in the micro-bubble generator 11 of the embodiment, and 51.2 L / min in the micro-bubble generator of the comparative example. there were.

  The flow rate when the intake amount is 7.0 L / min is 39.8 L / min in the micro-bubble generator 11 of the embodiment, and 56.3 L / min in the micro-bubble generator of the comparative example. there were.

  The flow rate when the intake amount is 9.0 L / min is 43.2 L / min in the micro-bubble generator 11 of the embodiment, and 65.2 L / min in the micro-bubble generator of the comparative example. there were.

  In the micro-bubble generator 11 of the embodiment, the flow rate at an intake amount of 11 L / min is 45.6 L / min, the flow rate at an intake amount of 13 L / min is 47.5 L / min, and the intake amount is 14.4. The flow rate at 9 L / min was 58.3 L / min.

  On the other hand, in the micro-bubble generating device of the comparative example, the intake amount 11.2 L / min was the maximum intake amount, and the flow rate at that time was 72.3 L / min.

  As is clear from these measurement results, the micro-bubble generator 11 provided with the end face 35a by the step 35 has an increase in intake amount compared to the micro-bubble generator without the step 35, and the maximum intake amount increased.

  According to the micro-bubble generation system 1 using the micro-bubble generator 11 configured as above, the step 35 is provided between the taper 32 and the nozzle 33 so that the space between the taper 32 and the nozzle 33 can be obtained. The end surface 35a which opposes in the flow direction of water is formed. By inhibiting the flow of water by the end face 35a, it is possible to increase the intake amount and the maximum intake amount.

  As a result, since it becomes possible to reduce the flow rate for obtaining a predetermined intake amount, the number of rotations of the motor of the pump device 10 for obtaining a predetermined intake amount decreases, thereby reducing the running cost. Is possible.

  Further, the annular end face 35a having a diameter larger than the inner diameter of the nozzle portion 33 may be simply provided between the tapered portion 32 and the nozzle portion 33 so that the manufacturing cost of the micro bubble generating device 11 is not increased.

  In addition, since the amount of intake air increases, the flow rate can be small, the output of the pump can be reduced, and the manufacturing cost and the size of the pump device 10 and the micro bubble generation system 1 can be reduced.

  As described above, according to the micro-bubble generating system 1 according to the embodiment of the present invention, the stepped portion 35 is formed between the tapered portion 32 and the nozzle portion 33 of the body 21 to thereby form the end surface 35a opposed to the flow of water. It is possible to increase the intake amount with a simple configuration in which

  The present invention is not limited to the above embodiment. For example, in the above-mentioned example, although the composition which uses screw 61 for fracturing means for fracturing air bubbles was explained, it is not limited to this. That is, as long as the tip is a needle-like member having an acute angle and it is possible to crush the air bubbles, another crusher may be used.

  Further, the micro-bubble generation system 1 may be configured not only for seawater but also for fresh water, or may be configured for use other than in a cage or aquarium 100.

  Further, the micro-bubble generating device 11 is not limited to the configuration in which the end face 35a is provided, and can be appropriately set as long as it can form a surface facing the flow of water. That is, in order to provide the end surface 35a, it is not limited to the structure which forms the level | step-difference part 35 by countersinking. For example, as shown in the micro-bubble generating device 11 of another embodiment shown in FIG. 5, the hollow frusto-conical member 35A having a cylindrical opening with the same inner diameter as the tapered portion 32 is tapered. It may be inserted into the In this configuration, it is not necessary to perform the counterboring process for providing the stepped portion 35 in the tapered portion 32, and the same effect as the micro air bubble generating device 11 according to the above-described embodiment can be obtained.

  Although the end face 35a has been described as being an annular face, the present invention is not limited to this, and it may be an end face of another shape as long as the intake amount is increased. The surface facing the flow may be partially formed. Besides the above, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... micro bubble generation system, 10 ... pump apparatus, 11 ... micro bubble generator, 12 ... discharge piping, 21 ... body, 22 ... diffuser, 23 ... crushing member, 24 ... intake pipe, 31 ... inlet, 31a ... female Screw portion 32, Taper portion 33, Nozzle portion 34, Expanded diameter portion 34a: First enlarged diameter portion 34b: Second expanded diameter portion 34c: Communication hole, 35: Stepped portion, 35a: End surface, 35A ... member, 36 ... mounting portion, 36a ... female screw portion, 41 ... first cylindrical portion, 41a ... chamfered portion 42 ... first flange portion, 51 ... second cylindrical portion, 52 ... second flange portion, 61 ... Screw (crushing means), 62 ... opening, 71 ... connection, 72 ... intake valve, 99 ... fastening member, 100 ... water tank, 101 ... sea water, 200 ... flow rate detection device.

Claims (4)

A tapered portion whose internal diameter is gradually reduced, a nozzle portion provided on the secondary side of the tapered portion and having the same internal diameter, and a flow direction of water provided between the tapered portion and the nozzle portion A body having an enlarged end portion provided on the secondary side of the end surface and the nozzle portion and having an inner diameter larger than that of the nozzle portion;
An intake pipe connected to the enlarged diameter portion;
A diffuser provided at the enlarged diameter portion;
A crushing member provided at an end of the enlarged diameter portion and having crushing means for crushing gas sucked from the intake pipe;
A micro-bubble generator comprising:   The fine structure according to claim 1, wherein the end face is formed by countering a portion of the tapered portion continuing to the nozzle portion into an annular shape having a diameter larger than the inner diameter of the nozzle portion. Air bubble generator.   The micro-bubble generating device according to claim 1, wherein the end face is formed of a member having a truncated cone shape and an opening having the same diameter as the inner diameter of the nozzle portion. A tapered portion whose internal diameter is gradually reduced, a nozzle portion provided on the secondary side of the tapered portion and having the same internal diameter, and a flow direction of water provided between the tapered portion and the nozzle portion A body having an enlarged diameter portion provided on the secondary side of the end surface and the nozzle portion and having an inner diameter larger than that of the nozzle portion, an intake pipe connected to the enlarged diameter portion, the enlarged diameter portion A micro bubble generation device comprising: a diffuser provided; and a crushing member provided at an end of the enlarged diameter portion and having crushing means for crushing gas sucked from the intake pipe.
A pump device connected to the primary side of the body;
A micro bubble generation system comprising: