JP5072089B2 - Micro bubble generator - Google Patents

Description

  The present invention relates to a microbubble generator for generating microbubbles (fine bubbles) in a fluid in which a plurality of liquids are mixed.

  A cleaning method or apparatus is used in many fields in which a cleaning agent stock solution is diluted with water or a solvent to a specified concentration and mixed, and the prepared cleaning liquid is sprayed onto an object to be cleaned to remove dirt. Yes. Since the concentration of the cleaning agent stock solution and water is too high with the cleaning agent stock solution alone, the workability is inferior and the cleaning cost is expensive. This is to improve the performance.

For example, in the printing field, ink scum or paper dust adheres to the surface of a cylinder such as a blanket cylinder or the surface of an ink kneading roller group over time, and a cylinder cleaning device or a brush roll cleaning device is used to clean the surface. Alternatively, cleaning is performed using a cleaning liquid in a roller cleaning device.

In the field of nursing care, it is used for body cleaning equipment for washing the body using soap and hot water, which is a cleaning agent for bathing persons with physical disabilities, and massage equipment for rehabilitation. Or, in the field of cleaning, it is used for cleaning shoe marks attached to linoleum floors, residual traces of beverages, etc., by scrubbing the floor with a brush provided in a polisher with a cleaning liquid and water, etc. , Across multiple fields.
However, in these listed examples, if the relatively expensive cleaning solution is diluted too much, the cleaning effect becomes extremely poor, so that the cleaning solution is wasted and used for cleaning. Of course, the cost for cleaning was high.

  Therefore, as shown in Patent Document 1 and Patent Document 2, a mixing chamber that forms a main flow having a venturi-shaped inflow portion and outflow portion that generates microbubbles in water, and a center between the inflow portion and the outflow portion. A microbubble generator having a configuration in which a suction part that sucks and mixes a liquid from a substream facing the small-diameter portion is provided in a substantially T shape has been proposed.

  Also, microbubbles are ejected into the water in the bathtub to remove the dirt on the skin while taking a bath, and give a relaxing effect.The microbubble generator has a bench-yuri-shaped inflow section that gives microbubbles to the water. A mixing chamber for forming a main flow having an outflow portion and a suction portion for sucking and mixing the liquid from the side flow facing the central small diameter portion between the inflow portion and the outflow portion are provided in a substantially T shape. It becomes the composition.

  However, in the microbubble generator having these structures, the liquid flowing into the mixing chamber from the suction section is only sucked by the reduced pressure due to the flow velocity of the mainstream liquid flowing in the mixing chamber, and there is no vortex mixing in the suction section. And the mainstream liquid are not sufficiently mixed, the amount of microbubbles generated is small, the diameter of each bubble, that is, the surface area is not reduced, and the adsorption of dirt components is correspondingly reduced.

In addition, despite the complicated structure, the secondary liquid flowing into the mixing chamber from the suction portion is the same liquid as the mainstream liquid flowing in the mixing chamber, so even if microbubbles are generated, the bubble disappearance time is It is difficult to demonstrate the performance of microbubbles quickly.
Further, the internal pressure of each generated bubble is not high, the air jet flow when the bubble collapses is low, and there is a drawback that the force for stripping off the components of the soil is weak.

JP-A-6-165806 JP 2006-167612 A

  The present invention has been made in view of the above problems, and its purpose is to reduce the individual bubble diameter of the microbubbles to increase the surface area, to enhance the surface activity and to adsorb dirt, Another object of the present invention is to provide a microbubble generator in which a high-pressure air jet is confined in each bubble and the dirt is peeled off by the force of the air jet when the bubble collapses.

According to the present invention, in a microbubble generator that mixes liquid and gas to generate microbubbles in a fluid, the microbubble generator includes a main mixing section (3) provided in a block member (2), and the main mixing section (3) consists of an inflow part (5) connected to the pneumatic feed pump, an inflow part (5) and an outflow part (6) provided in a straight line, and the inflow part (5) and the outflow part (6) The block member (2) is screwed (5a, 6a), and the narrow portion (7) is formed on the block member (2) at the tip of the inflow portion (5) and the outflow portion (6). Further, the sub-mixing part (4) formed in the block member (2) has a mixing chamber (11), and the mixing chamber (11) is connected to the narrow-diameter part (7) via the communication path (8). are communicated to the mixing chamber (11) in the first liquid flow inlet (12) and a second liquid inlet (13 DOO each check valve (10, 14, 15) are found provided on the is open, and the flow join the club (5) and the first liquid flow inlet (12) and a second liquid inlet (13) .

  According to the invention, the first liquid inlet (12) and the second liquid inlet (13) face each other in a straight line.

And according to this invention, the said 1st liquid inflow port (12) and 2nd liquid inflow port (13) are opened to the inner wall of the mixing chamber (11) in the diametrically opposed position .

According to the invention which concerns on Claim 1, from the main mixing part which has the inflow part and the outflow part which the pressurized gas passes, and the submixing part which makes the pressurized liquid vortex and pumps to the said main mixing part Since the liquid vortex generated in the sub-mixing part is mixed with the gas vortex in the small diameter part of the main mixing part to produce a mixed fluid containing microbubbles, the bubble diameter becomes small. The surface area of the detergent stock solution is different from the surface area of the detergent stock solution mixed by stirring with conventional distilled water. Can be increased.
In addition, due to the generation of a local high-pressure field in the microbubbles generated by the eddy current, a high-pressure air jet confined in the microbubbles is ejected when the bubble collapses, and the high-pressure jet strips off the dirt components adhering to the cleaning surface. Can be taken.

  According to the second aspect of the present invention, since the plurality of liquid inlets open opposite to the inner wall of the mixing chamber of the sub-mixing unit, the liquid flowing in along the polygonal inner wall forms a vortex in the mixing chamber. Thus, a plurality of liquids can be sufficiently mixed in the mixing chamber, and the liquid is pumped from the communication path to the small diameter portion of the main mixing portion while being swirled.

  According to the third aspect of the present invention, the microbubbles can be generated regardless of the simple structure in which the check valve is installed in each of the gas inflow portion and the liquid inflow port. There is no need for maintenance.

  According to the fourth aspect of the present invention, the cleaning liquid that exits the outflow portion downstream of the small-diameter portion of the main mixing portion increases the number of microbubbles by sufficiently mixing with air in a chamber having a large diameter. be able to.

  According to the fifth aspect of the present invention, a cleaning liquid is prepared with a mixing ratio of the cleaning agent stock solution, which is a plurality of liquids, and water in the range of 1: 5 to 1:20, and suitable cleaning is achieved by using the cleaning liquid. It can be performed.

  Hereinafter, an embodiment in which a microbubble generating device according to the present invention is applied to a cylinder cleaning device of a printing press will be described with reference to the drawings. It can also be applied in the field of dropping.

1 is a cross-sectional view of one embodiment of a microbubble generator according to the present invention, FIG. 2 is a cross-sectional view of a sub-mixing section taken along line AA in FIG. 1, and FIG. FIG. 4 is a block diagram of an example in which the microbubble generator according to the present invention is used in a printing press.

  The microbubble generator 1 shown in FIG. 1 preferably has a rectangular parallelepiped block member 2, and the block member 2 is fixed to a frame of a printing machine (not shown) by appropriate fixing means.

The main mixing section 3 has a linear shape, and has an inflow section 5 connected to a pneumatic pump (not shown) and an outflow section 6 to which a mixed fluid of air and cleaning liquid is pumped. The inflow section 5 and the outflow section 6 are blocked. The member 2 is screwed and fixed from both sides. Reference numerals 5a, 6a, 12a and 13a denote screwing portions, respectively, and 17 denotes a closing plug at the bottom of the mixing chamber 11.

  A small-diameter portion 7 is formed in the block member 2 at the center of the front end of the inflow portion 5 and the outflow portion 6, and the inner diameter of each of the nipple-shaped inflow portion 5 and outflow portion 6 is large. The taper is tapered (not shown) as it goes to the small diameter portion 7.

  The diameter of the small diameter portion 7 at the center is, for example, a small diameter that is about a quarter of the inner diameter of the inflow portion 5 and the outflow portion 6. A hole is formed so as to face the narrow-diameter portion 7, and a communication path 8 that connects the main mixing portion 3 and the sub-mixing portion 4 is formed.

  A known check valve 10 that allows a gas flow in only one direction is disposed in the inflow portion 5 of the main mixing portion 3.

  The sub-mixing portion 4 has a mixing chamber 11 having a polygonal cross section, that is, an inner wall, and preferably a circular shape. The mixing chamber 11 is formed below the narrow-diameter portion 7 of the block member 2. The first liquid inlet 12 and the second liquid inlet 13 are opened to face each other so as to contact the inner wall of the mixing chamber 11.

  Known check valves 14 and 15 that allow flow to only one of the first liquid inlet 12 and the second liquid inlet 13 that are opened tangentially to the inner wall of the mixing chamber 11 are arranged.

  As shown in FIG. 4, the inflow part 5 of the main mixing part 3 is connected to the solenoid valve 22 from the air source 20 via the regulator 21 by piping, and the outlet 6 of the main mixing part 3 is a cylinder of a printing machine (not shown). It is connected to a cleaning nozzle 23 provided facing the cleaning device by piping. The first liquid inlet 12 of the sub-mixing unit 4 is connected to a tank 25 that stores an organic solvent liquid (cleaning agent stock solution) via a cylinder switch 26 that adjusts the flow rate, so that the second liquid The inlet 13 is connected to a tank 27 that stores distilled water via a cylinder switch 28 that adjusts the flow rate. The operations of the solenoid valve 22 and the cylinder switches 26 and 28 are controlled by a control device in the control box 29.

  The operation of the microbubble generator configured as described above will be described.

  When it is necessary to wipe off dirt such as ink residue on the cylinder surface after the printing operation is completed, the cylinder switch 26 is operated while measuring the storage amount of the cleaning stock solution according to the command of the controller 29, The cylinder switch 28 is actuated while measuring the storage amount, and each prescribed amount is fed into the sub-mixing unit 4.

  The pressurized cleaning agent stock solution and water collide from the first liquid inlet 12 and the second liquid inlet 13 in the mixing chamber 11 of the submixing unit 4 and mix while forming a vortex. Then, the mixed cleaning liquid passes through the communication path 8 and is pumped to the small diameter portion 7 of the main mixing portion 3 while being swirled.

  On the other hand, the solenoid valve 22 that has received a command from the controller 29 opens the air flow path and allows the pressurized air to flow toward the inflow portion 5 of the main mixing portion 3. The air that has entered the inflow section 5 is squeezed by a tapered flow path to form a vortex as it goes to the small diameter section, and when passing through the small diameter section 7, the flow velocity is increased and the pressure is reduced. Air is blown into the cleaning liquid while sucking the diluted cleaning liquid that is a vortex flow in the chamber 11 from the communication path 8 to generate microbubbles. Then, the cleaning liquid is sprayed from the hole formed in the cleaning nozzle 23 toward the object to be cleaned.

  The cleaning agent in the cleaning liquid becomes the bubble size of the microbubbles, and the surface area increases. Unlike the surface area of the bubble size generated when mixing by conventional stirring, the surface activity increases and the cleaning surface increases. It is possible to increase the adsorptivity of the dirt component adhering to the interface to the interface.

  In addition, due to the generation of a local high-pressure field in the microbubble generated while vortexing, a high-pressure air jet confined in the microbubble when the bubble collapses is ejected and the high-pressure jet adheres to the cleaning surface Can be peeled off.

  The cleaning liquid prepared by the mixing ratio of the cleaning agent stock solution and water is sprayed onto the cylinder, which is the object to be cleaned, and the degree of visual observation of paper dust and dirt on the cylinder surface is summarized in Table 1. For each mixing ratio, ◯ indicates that cleaning is sufficient and a state that does not hinder the next operation is obtained, and Δ indicates that stain unevenness remains and cleaning is necessary again.

  FIG. 3 shows another embodiment of the sub-mixing unit 4. In FIG. 3, two types of liquids (here, a detergent stock solution and water) pumped from the first liquid inlet 12 and the second liquid inlet 13 are used. The shape of the mixing chamber 16 to be mixed is different. The first liquid inlet 12 and the second liquid inlet 13 are opened in the inner wall of the mixing chamber 16 at equal intervals in the circumferential direction, that is, at diametrically opposed positions.

  In this case, the cleaning liquid stock solution from the first liquid inlet 12 and the water from the second liquid inlet 13 generate a vortex while rotating along the wall of the circular chamber after flowing into the mixing chamber 16. The pressure is fed from the communication path 8 to the main mixing unit 3.

It should be noted that the illustrated embodiment is merely an example, and is not a description of the purpose of limiting the technical scope of the present invention.
That is, although the cylinder cleaning in the printing field has been described, it can be applied to the cleaning by the two-liquid mixing in the nursing field, the cleaning field or the civil engineering field described in the background art. In addition, two or more kinds of cleaning agent stock solutions can be used as the cleaning liquid, a gas other than air can be used as the gas, and a liquid other than water can be used as the dilution liquid. Moreover, you may integrally mold, without forming an inflow part and an outflow part, and a block member separately.

The figure which shows one Embodiment of the microbubble generator which concerns on this invention in a partial cross section. Sectional drawing of the submixing part shown by the AA cross section in FIG. The figure which shows other embodiment of a submixing part. The block diagram of the example which used the microbubble generator concerning this invention for the printing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Microbubble generator 3 ... Main mixing part 4 ... Submixing part 5 ... Inflow part 6 ... Outflow part 7 ... Small diameter part 8 ... Communication path 12 ... -1st liquid inlet 13 ... 2nd liquid inlet

Claims (3)

A microbubble generator for generating a microbubble in a fluid by mixing a liquid and a gas includes a main mixing section (3) provided in a block member (2), and the main mixing section (3) is pneumatically fed. An inflow portion (5) connected to the pump and an outflow portion (6) provided in a straight line with the inflow portion (5) are provided. The inflow portion (5) and the outflow portion (6) are each a block member (2). And a small diameter portion (7) is formed in the block member (2) at the tip of the inflow portion (5) and the outflow portion (6). The sub-mixing part (4) formed in 2) has a mixing chamber (11), and the mixing chamber (11) communicates with the narrow-diameter part (7) via the communication path (8), Contact performing the mixing chamber (11) has a first liquid inlet (12) and a second liquid inlet (13) is opened And micro characterized in that the flow join the club (5) and the first liquid flow inlet (12) and a second respective check valves in the liquid inlet (13) (10, 14, 15) is provided Bubble generator. The microbubble generator according to claim 1, wherein the first liquid inlet (12) and the second liquid inlet (13) face each other in a straight line. 2. The microbubble generator according to claim 1, wherein the first liquid inlet (12) and the second liquid inlet (13) are opened in a diametrically opposed position on the inner wall of the mixing chamber (11).

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