JP2005204951A - Microbubble generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generator, effectively reducing jetting noise. <P>SOLUTION: In this microbubble generator, a gas-liquid dissolved fluid in which gas is pressurized and dissolved in liquid is pressure-released by a pressure reducing valve, thereby generating microbubbles and simultaneously injection discharging the same in a liquid tank through a discharge opening. The discharge side of the discharge opening 24d of the pressure reducing valve 18 is provided with injection noise damping means 28 (A to C), and the damping means 28 (A to C) are formed of a mesh body 28A or an elastic body 28B surrounding the periphery of the discharge side of the discharge opening 24d or a conical body 28C provided in the center of the discharge side of the discharge opening 24d. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fine bubble generator that can reduce injection noise.

2. Description of the Related Art Conventionally, there is a fine bubble generating device in which a gas-liquid dissolved fluid in which a gas is pressurized and dissolved in a liquid is released by a pressure reducing valve and ejected and discharged from a discharge hole into a liquid tank while generating fine bubbles. (For example, refer to Patent Document 1).
JP-A-11-33071

  However, in the case where the liquid tank is a bathtub, there is a problem that the injection noise generated when the fine bubbles are generated by the pressure reducing valve is directly radiated into the bathroom.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fine bubble generator capable of effectively reducing injection noise.

In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that a gas-liquid dissolved fluid in which a gas is pressurized and dissolved in a liquid is released by a pressure reducing valve to generate fine bubbles from the discharge hole into the liquid tank. In the fine bubble generator for jetting and discharging
An injection noise attenuation means is provided on the discharge side of the discharge hole of the pressure reducing valve.

  A second aspect of the present invention is the fine bubble generating device according to the first aspect, wherein the attenuating means is a mesh body surrounding the discharge side periphery of the discharge hole.

  A third aspect of the present invention is the fine bubble generating device according to the first aspect, wherein the attenuating means is an elastic body surrounding a discharge side periphery of the discharge hole.

  A fourth aspect of the present invention is the fine bubble generating apparatus according to the first aspect, wherein the attenuating means is a conical body provided at the discharge side center of the discharge hole.

  A fifth aspect of the present invention is the fine bubble generating device according to the first aspect, wherein the attenuating means is arranged at the center of the discharge side of the discharge hole and the mesh body or elastic body surrounding the discharge side of the discharge hole. It is a combination with the provided cone.

  A sixth aspect of the present invention is the fine bubble generating device according to any one of the first to fifth aspects, wherein the pressure reducing valve includes a supply-side nozzle portion and a discharge-side nozzle portion, and the damping is performed. The means is installed inside a nozzle cover that forms the periphery of the discharge side of the discharge hole of the discharge side nozzle portion.

  According to the first aspect of the present invention, since the injection noise attenuation means is provided on the discharge side of the discharge hole of the pressure reducing valve, the injection noise at the time of generation of fine bubbles by the pressure reducing valve is effective due to the damping action of the pulsation by the attenuation means. Reduced.

  According to the invention of claim 2, since the mesh body surrounding the discharge side periphery of the discharge hole is provided as the attenuating means, the injection noise at the time of the generation of fine bubbles by the pressure reducing valve is caused by the pulsation diffusion attenuation action by this mesh body. Effectively reduced.

  According to the invention of claim 3, since the elastic body surrounding the discharge side of the discharge hole is provided as the attenuating means, the injection noise at the time of generation of fine bubbles by the pressure reducing valve is caused by the absorption and attenuation action of the pulsation by the elastic body. Effectively reduced.

  According to the invention of claim 4, since the conical body is provided at the discharge side center of the discharge hole as the attenuating means, turbulence hardly occurs near the center of the discharge hole due to the rectifying action by the conical body. The noise due to is effectively reduced.

  According to the invention of claim 5, since the mesh body or the elastic body and the conical body are combined as the damping means, both the injection noise when the fine bubbles are generated by the pressure reducing valve and the noise due to the turbulent flow are effectively obtained. Will be reduced.

  According to the invention of claim 6, when the pressure reducing valve is constituted by the supply side nozzle portion and the discharge side nozzle portion and the attenuation means is installed inside the nozzle cover, the attenuation means is a mesh body or an elastic body. By installing the nozzle cover so that there is no step between the inner peripheral surface of the nozzle cover, turbulent flow is less likely to occur near the outer periphery of the discharge hole, so that noise due to turbulent flow is effectively reduced. become.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 5, a suction inlet 2 and a discharge outlet 3 are formed in the bathtub wall 1 a of the bathtub 1, and the suction inlet 2 is connected to an inlet of an air suction part (ejector) 5 through a connection pipe 4. The outlet of the air suction unit 5 is connected to a pump 7 via a connection pipe 6.

  On the back surface of the flange portion of the bathtub 1, an air intake portion 11 composed of a check valve 8, a throttle valve 9, and a filter 10 is installed. The air intake portion 11 is connected via a connecting pipe 12. It is connected to the side of the air suction part 5.

  The pump 7 is connected to a spray nozzle 15 provided on the upper portion of the gas-liquid dissolution tank 14 via a connecting pipe 13, and the gas-liquid dissolution tank 14 is provided with an air vent valve 16.

  The lower part of the gas-liquid dissolution tank 14 is connected to the discharge port 3 through a connecting pipe 17, and a pressure reducing valve 18 is installed in the discharge port 3.

  And if the pump 7 is driven by switch operation, the bath water in the bathtub 1 will be absorbed by the pump 7 via the connection pipes 4 and 6 from the suction inlet 2, and the air suction part (ejector) in the middle of that The negative pressure action 5 causes the air taken in from the air intake 11 to be mixed into the bath water.

  The bath water mixed with this air is jetted from the spray nozzle 15 into the gas-liquid dissolution tank 14 through the connecting pipe 13 from the pump 7 and enters a bubbling state. Excess air in the gas-liquid dissolution tank 14 is discharged from the air vent valve 16 to the outside of the tank.

  The bath water in the gas-liquid dissolution tank 14 is discharged into the bathtub 1 from the discharge port 3 while being converted into bath water containing white fine cloudy bubbles by the pressure reducing valve 18.

  By repeating such circulation of the bath water, the inside of the bathtub 1 is filled with bath water with fine bubbles.

  FIG. 1A is a detailed plan sectional view of the pressure reducing valve 18 installed in the discharge port 3. A ring-shaped packing 20 is attached to the inner peripheral edge of the discharge port 3, and a bathtub fixture 21 is fitted into the packing 20 from the inside of the bathtub 1 in a watertight manner, and at the rear end 21 a of the bathtub fixture 21. The front end flange portion 17a of the connection pipe 17 is connected in a watertight manner. A discharge port cover 22 having an opening 22 a is attached to the flange portion 21 b of the bathtub fixture 21.

  The pressure reducing valve 18 is installed across the inside of the bathtub fixture 21 and the inside of the front end flange portion 17 a of the connecting pipe 17. The pressure reducing valve 18 includes a supply side nozzle portion 23 and a discharge side nozzle portion 24.

  The supply-side nozzle portion 23 includes a substantially cylindrical supply-side nozzle body 23a, and a decompression opening 23b is formed at the center of the supply-side nozzle body 23a. The decompression opening 23b is for discharging the pressure-dissolved gas-liquid dissolution bath water and releasing the pressure. A smooth opening peripheral surface 23c is formed at the opening periphery of the decompression opening 23b. An arc concave ring groove 23d (see FIG. 1B) is formed on the peripheral edge surface 23c along the periphery of the decompression opening 23b.

  The discharge-side nozzle portion 24 includes a substantially cylindrical discharge-side nozzle body 24a. At the rear end of the discharge-side nozzle body 24a, the discharge-side nozzle body 24a faces the decompression opening 23b and has a predetermined clearance S from the opening peripheral surface 23c. A pressure release surface 24b is formed separating the two. A concave ring groove 24c (see FIG. 1C) is formed around the pressure release surface 24b, and the bottom of the ring groove 24c is equiangular on the circumference (45 degrees in this example). A plurality of discharge holes 24d are formed. The discharge holes 24d are for injecting and discharging fine bubbles generated at the interval S between the opening peripheral surface 23c and the pressure release surface 24b into the liquid tank 1.

  The discharge-side nozzle portion 24 is provided with a nozzle cover 25 that forms the periphery of the discharge side of the discharge hole 24d, and an opening 25a that opposes the opening 22a of the discharge port cover 22 is formed on the upper portion thereof, A stepped portion 25b is formed on the inner peripheral surface so as to be wider than the outer periphery of the discharge hole 24d. The step portion 25b is formed by screwing a female screw formed on the inner periphery of the rear end of the nozzle cover 25 onto a male screw formed on the outer periphery of the front end of the discharge side nozzle main body 24a. This occurs when combined.

  The pressure reducing valve 18 is a seal ring of the supply-side nozzle body 23a in a state where the position in the front-rear direction is regulated between the recess 22b of the opening 22a of the discharge port cover 22 and the hook portion 21b of the bathtub fixture 21. 26 is fitted into the front end flange portion 17a of the connecting pipe 17 in a watertight manner.

  In the configuration of the pressure reducing valve 18, when the gas-liquid dissolving bath water pressurized and dissolved from the connecting pipe 17 is supplied (see arrow P), the opening peripheral surface 23c and the pressure release from the pressure reducing opening 23b of the supply side nozzle body 23a. Since the pressure is rapidly reduced in the process of flowing in the gap S between the surface 24b, the air (gas) in the bath water boiles under reduced pressure to generate fine bubbles, which are converted into bath water containing white fine cloudy bubbles. Then, the liquid is discharged from the discharge port 3 into the bathtub 1. At this time, since the turbulent flow of the bath water can be suppressed by the arc-shaped concave ring groove 23d of the supply side nozzle body 23a, the noise due to the turbulent flow in this portion can be effectively reduced.

  In the configuration of the pressure reducing valve 18, as shown in FIGS. 2 to 4, an injection noise attenuating means 28 (in the inside of the nozzle cover 25 that forms the discharge side periphery of the discharge hole 24 d of the discharge side nozzle portion 24 ( A to C) are installed.

  As shown in FIG. 2, the attenuating means 28 of the first embodiment is composed of a mesh body 28A that is rounded into a cylindrical shape so as to surround the discharge side periphery of the discharge hole 24d.

  The mesh body 28A has, for example, a mesh of about # 30 to 120, and the discharge side nozzle is formed so that the stepped portion 25b in the nozzle cover 25 is eliminated and the discharge side periphery of the discharge hole 24d becomes flat. It is provided between the front surface 24 e of the main body 24 a and the opening 25 a of the nozzle cover 25.

  If the mesh body 28A of the first embodiment is provided, the injection noise when the fine bubbles are generated by the pressure reducing valve 18 is effectively reduced by the pulsation diffusion attenuation action of the mesh body 28A. Further, the stepped portion 25b is not generated between the mesh body 28A and the inner peripheral surface of the nozzle cover 25, and turbulent flow is hardly generated near the outer periphery of the discharge hole 24d. Therefore, noise due to turbulent flow is also effectively reduced. Will come to be.

  As shown in FIG. 3, the attenuating means 28 of the second embodiment is constituted by a cylindrical elastic body 28B so as to surround the discharge side periphery of the discharge hole 24d.

  For example, if the elastic body 28B is made of rubber, the elastic body 28B has a hardness of about 40 to 80, and the stepped portion 25b in the nozzle cover 25 is eliminated, so that the discharge side periphery of the discharge hole 24d becomes flat. The discharge side nozzle body 24a is provided between the front surface 24e and the opening 25a of the nozzle cover 25.

  If the elastic body 28B of the second embodiment is provided, the injection noise when the fine bubbles are generated by the pressure reducing valve 18 is effectively reduced by the pulsation absorption and attenuation action of the elastic body 28B. Further, the elastic body 28B prevents the stepped portion 25b from being formed between the inner peripheral surface of the nozzle cover 25 and makes it difficult for turbulent flow to occur near the outer periphery of the discharge hole 24d, thereby effectively reducing noise due to turbulent flow. Will come to be.

  As shown in FIG. 4, the attenuating means 28 of the third embodiment is composed of a cone 28C provided at the discharge side center of the discharge hole 24d.

  The conical body 28C may be made of metal or synthetic resin, and extends from the center of the front surface 24e of the discharge side nozzle body 24a while reducing its diameter to the front, and between the front surface 24e and the opening 25a of the nozzle cover 25. It is provided over. The cone 28C may be integrated with or separate from the discharge side nozzle portion 24.

  If the cone 28C of the third embodiment is provided, the rectifying action by the cone 28C makes it difficult for turbulent flow to occur near the center of the discharge hole 24d, so that noise due to turbulent flow is effectively reduced. Become.

  When the damping means 28 (A to C) of the first to third embodiments as shown in FIGS. 2 to 4 is installed in the pressure reducing valve 18 of FIG. 1, the pressure reducing valve 18 is compared with the pressure reducing valve 18 of FIG. 1. In the mesh body 28A of the first embodiment, the noise is -5 dB (A characteristic), and in the elastic body 28B of the second embodiment, the noise is -6.2 dB (A characteristic), and the cone 28C of the third embodiment. Then, noise could be reduced by -3 dB (A characteristic), respectively.

  Note that the mesh body 28A or elastic body 28B of the first and second embodiments can be combined with the cone body 28C of the third embodiment. In this case, the injection noise when fine bubbles are generated by the pressure reducing valve 18 And noise due to turbulent flow are effectively reduced.

  Although the pressure reducing valve 18 of the above embodiment is configured by the supply-side nozzle portion 23 and the discharge-side nozzle portion 24, the present invention is not limited to this configuration.

It is a pressure-reduction valve of a bubble generator, (a) is a plan sectional view, (b) is a sectional view taken along line AA in (a), and (c) is a sectional view taken along line BB in (a). It is a mesh body of a 1st embodiment, (a) is a plane sectional view, (b) is a CC line sectional view of (a), and (c) is a perspective view. It is an elastic body of a 2nd embodiment, (a) is a plane sectional view, (b) is a DD line sectional view of (a), and (c) is a perspective view. It is a cone of 3rd Embodiment, (a) is a plane sectional view, (b) is a perspective view. It is a system diagram of the bubble generator of a bathtub.

Explanation of symbols

18 Pressure reducing valve 23 Supply side nozzle portion 23a Supply side nozzle body 23b Pressure reducing port 23c Opening peripheral surface 24 Discharge side nozzle portion 24a Discharge side nozzle body 24b Pressure release surface 24c Ring groove 24d Discharge hole 25 Nozzle cover 25b Stepped portion 28 Attenuating means 28A Mesh body 28B Elastic body 28C Cone S Spacing

Claims (6)

In the fine bubble generating device that releases the pressure of the gas-liquid dissolved fluid in which the gas is pressurized and dissolved in the liquid with a pressure reducing valve, and ejects and discharges the fine bubble from the discharge hole into the liquid tank,
An apparatus for generating fine bubbles, characterized in that an injection noise attenuation means is provided on the discharge side of the discharge hole of the pressure reducing valve.   2. The fine bubble generating apparatus according to claim 1, wherein the attenuating means is a mesh body that surrounds the discharge side periphery of the discharge hole.   2. The fine bubble generating device according to claim 1, wherein the attenuating means is an elastic body surrounding a periphery of the discharge side of the discharge hole.   2. The fine bubble generating apparatus according to claim 1, wherein the attenuating means is a conical body provided at the discharge side center of the discharge hole.   The said attenuating means is a combination of a mesh body or an elastic body surrounding the discharge side periphery of the discharge hole and a conical body provided at the discharge side center of the discharge hole. Fine bubble generator.   The pressure reducing valve includes a supply-side nozzle portion and a discharge-side nozzle portion, and the damping means is installed inside a nozzle cover that forms the discharge-side periphery of the discharge hole of the discharge-side nozzle portion. The micro-bubble generator according to any one of claims 1 to 5.

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