JP5692258B2 - Fine bubble generator and bath water heater - Google Patents

Description

  The present invention relates to a fine bubble generating device that generates fine bubbles by refining an introduced gas and mixing it with a liquid, and a bath water heater provided with the same.

  Venturi-type, cavitation-type, pressure-dissolution-type, swirl-flow-type apparatuses, and the like are known as apparatuses that uniformly mix gas in a liquid or generate fine bubbles. The venturi type has a constricted part in the flow path, the flow rate increases at the constricted part and negative pressure is formed, so that air is sucked in from the outside, and the pressure rises in the part where the constriction spreads, so the bubbles are refined This is the generation principle. In the cavitation type, bubbles are generated using cavitation by feeding a gas-liquid mixture into a pump and applying ultrasonic vibration, for example. The pressure dissolution method is a method in which the outside air introduced from outside the pipe through which the liquid flows is pressurized with a compressor or the like and dissolved in the liquid, and the bubbles reprecipitate when the pressure is released. In the pressure dissolution type, the apparatus becomes large, but a large amount of gas can be dissolved. In the swirl type, a swirl flow of liquid is formed and united with the gas, so that the gas is sheared and pulverized by the swirl flow. As an example of a swirling flow type, a device that decomposes organic matter by swirling organic waste liquid or the like, and a water purification device that uses air bubbles crushed by swirling water flow are known.

  Even in a device for decomposing organic matter and a water purification device, the generation of fine and large amount of bubbles is an important factor for manifesting the effect. In general, when a large amount of fine bubbles are generated at a low flow rate, a swirling flow method is used. In the swirling flow method, a water flow is introduced from the tangential direction of the bottom surface of the swirling flow generating section having a conical space, and the water flow is swirled along the wall surface of the conical space, or the swirling flow is swirled by a blade. There is a swirl blade system that generates In the swirling flow type, the diameter of the piping path through which the swirling flow circulates is reduced to increase the flow velocity, so that a pressure difference (negative pressure) is generated with respect to the atmospheric pressure. Is generated. As means for improving the amount of fine bubbles in the swirling flow type, there are the following means. (1) Improve the turning force of the swirling flow. (2) Increase the amount of gas introduced by negative pressure. (3) Increase the contact area between the swirl flow and the gas.

  In Patent Literature 1, a container body having a cylindrical space whose one end is closed by a wall and the other end is open, a gas introduction hole formed in the wall on one end, and an inner wall circle of the cylindrical space There is disclosed a fine bubble generating device comprising a pressurized liquid introduction port opened in a tangential direction on a part of a peripheral surface.

Japanese Patent No. 4725707

  In the microbubble generator disclosed in Patent Document 1, the gas introduced from the gas introduction hole is configured to contact only the central portion of the swirling flow formed in the cylindrical space, and the swirling flow and the gas are in contact with each other. The area is small. For this reason, it is difficult to increase the generation amount of fine bubbles. In addition, the fine bubble generator disclosed in Patent Document 1 is configured to form a swirling flow in the cylindrical space by introducing the pressurized liquid from the pressurized liquid introduction port in the tangential direction of the cylindrical space. The pressure loss is large.

  The present invention has been made in order to solve the above-described problems, and a fine bubble generator capable of stably increasing the amount of fine bubbles generated, and a bath water heater provided with the fine bubble generator. The purpose is to provide.

The fine bubble generating apparatus according to the present invention includes a swirling liquid flow generating section that generates a swirling liquid flow in a liquid flow path, a reduced diameter section that reduces the swirling diameter of the swirling liquid flow, and a gas around the outer periphery of the swirling liquid flow. The first gas introduction part that takes in the gas from the outside of the liquid flow path to the position downstream of the liquid flow path from the outside of the liquid flow path, and the liquid so that the gas contacts the inner periphery of the swirl liquid flow A second gas introduction part that takes in gas from outside the flow path to a position downstream of the liquid flow path from the swirl liquid flow generation part , and the swirl liquid flow and the gas taken in from the first gas introduction part The fine bubbles are generated by the gas taken in from the second gas introduction part.

  According to the present invention, since the contact area between the swirling liquid flow and the gas can be increased, it is possible to stably increase the generation amount of fine bubbles.

It is sectional drawing (longitudinal sectional view) which shows the fine bubble generator of Embodiment 1 of this invention. It is a perspective view which shows the turning blade with which the microbubble generator shown in FIG. 1 is provided. It is a typical cross-sectional view which shows the state which cut | disconnected the microbubble generator shown in FIG. 1 in the position of the 1st gas introduction part. It is a typical cross-sectional view which shows the state which cut | disconnected the modification of the microbubble generator shown in FIG. 1 in the position of the 1st gas introduction part. It is a typical cross-sectional view which shows the state which cut | disconnected the microbubble generator shown in FIG. 1 in the position of the 2nd gas introduction part. It is sectional drawing (longitudinal sectional view) which shows the fine bubble generator of Embodiment 2 of this invention. It is sectional drawing (longitudinal sectional view) which shows the fine bubble generator of Embodiment 3 of this invention. It is sectional drawing (longitudinal sectional drawing) of a part of fine bubble generator of Embodiment 4 of this invention. It is sectional drawing (longitudinal sectional drawing) of a part of fine bubble generator of Embodiment 5 of this invention. It is sectional drawing (longitudinal sectional drawing) of a part of fine bubble generator of Embodiment 6 of this invention. It is sectional drawing (longitudinal sectional drawing) of a part of fine bubble generator of Embodiment 7 of this invention. It is a block diagram which shows embodiment of the bath hot-water supply apparatus provided with the microbubble generator of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
1 is a cross-sectional view (longitudinal cross-sectional view) showing a fine bubble generating apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the fine bubble generating device 1A according to the first embodiment includes a swirl blade 2, a reduced diameter portion 3, a first gas introduction portion 4, a second gas introduction portion 5A, and bubbles. A generation unit 6 is provided. The microbubble generator 1A is installed in the middle of a liquid flow path such as a piping path. For example, a liquid such as water flows into the fine bubble generating device 1A from the left side in FIG.

  FIG. 2 is a perspective view showing the swirl vane 2. The swirl vane 2 functions as a swirl liquid flow generator that generates a swirl liquid flow in the liquid flow path. As shown in FIG. 2, the swirl vane 2 includes a vane 7 that applies a swirl force to a liquid flow such as a water flow, and a cylindrical tube portion 8 that fixes the vane 7. The blade 7 has a curved structure having an arc shape. The upstream portion of the blade 7 is arranged in a direction substantially parallel to the liquid flow, and the downstream portion of the blade 7 rises in a direction substantially perpendicular to the liquid flow. Are arranged as follows. As shown in FIG. 1, the liquid flow forms a swirl liquid flow SF by applying a swirl force when passing through the blades 7 of the swirl blade 2. In the illustrated configuration, the swirl vane 2 is provided with two vanes 7, but the number of vanes 7 may be one or three or more.

  The reduced diameter portion 3 speeds up the swirl liquid flow SF by reducing the radius of the swirl liquid flow SF generated by the swirl vanes 2. As shown in FIG. 1, the reduced diameter portion 3 is provided coaxially on the downstream side of the cylindrical tube portion 8 of the swirl vane 2. The inside of the reduced diameter portion 3 is reduced in a substantially conical shape toward the downstream side.

  The first gas introduction unit 4 takes in a gas AR1 such as air from the outside in the radial direction outside the liquid flow path, and supplies the gas AR1 to a position downstream of the reduced diameter unit 3. In the present embodiment, the first gas introduction unit 4 supplies the gas AR <b> 1 to the most reduced diameter part near the outflow end of the reduced diameter part 3.

  FIG. 3 is a schematic cross-sectional view showing a state in which the fine bubble generating device 1A shown in FIG. 1 is cut at the position of the first gas introduction part 4. As shown in FIG. As shown in FIG. 3, a gas discharge port 41 that is an outlet of the first gas introduction unit 4 opens on the inner peripheral surface of the liquid flow path. The gas AR1 taken in through the first gas introduction part 4 is discharged from the gas discharge port 41 of the first gas introduction part 4 and thereby contacts the outer periphery of the swirling liquid flow SF. In the configuration example shown in FIG. 3, the first gas introduction part 4 is formed so that the gas AR1 is united with the swirl liquid flow SF from a direction substantially orthogonal to the swirl direction of the swirl liquid flow SF.

  FIG. 4 is a schematic cross-sectional view showing a state in which the modified example of the fine bubble generating device 1A shown in FIG. 1 is cut at the position of the first gas introduction unit 4. The first gas introduction unit 4 may be the same as the configuration example shown in FIG. 4 instead of the configuration example shown in FIG. 3. In the configuration example shown in FIG. 4, the first gas AR1 is joined to the swirl liquid flow SF from the tangential direction (the tangential direction that is the forward direction with respect to the swirl direction) with respect to the swirl direction of the swirl liquid flow SF. A gas introduction part 4 is formed. With such a configuration, it is possible to reliably suppress the swirl liquid flow SF from being disturbed by the gas AR1 introduced from the first gas introduction unit 4, and thus it is possible to reliably reduce the shear force due to the swirl liquid flow SF. Can be suppressed. As a result, fine bubbles can be generated with higher efficiency.

  As shown in FIG. 1, the second gas introduction part 5 </ b> A is provided on the downstream side of the liquid flow channel with respect to the first gas introduction part 4. The second gas introduction part 5A takes in the gas AR2 such as air from the outside in the radial direction outside the liquid flow path, and brings the gas AR2 into contact with the inner periphery of the swirling liquid flow SF. The second gas introduction portion 5A has a cylindrical shape (or a tubular shape), and the cross-sectional shape thereof is preferably, for example, a circle. One end (front end) of the second gas introduction part 5A is located at the central part (near the center) of the liquid flow path through which the swirl liquid flow SF flows, and the other end of the second gas introduction part 5A. The part (base end part) is located outside the liquid flow path. The gas AR2 is sucked from the other end portion of the second gas introduction portion 5A, passes through the second gas introduction portion 5A, and is formed at the one end portion of the second gas introduction portion 5A. It is discharged from the discharge port 51 and comes into contact with the inner periphery (center portion) of the swirling liquid flow SF. The axial direction of the second gas introduction part 5A in the present embodiment is substantially perpendicular to the axial direction of the liquid channel.

  The bubble generating unit 6 is provided coaxially on the downstream side of the reduced diameter portion 3. In the present embodiment, the bubble generating unit 6 has a portion whose inner diameter decreases in a substantially conical shape toward the upstream side (the reduced diameter portion 3).

  Next, the basic operation of the fine bubble generating device 1A will be described with reference to FIG. 1 and FIG. First, as shown in FIG. 1, when the liquid flowing in the liquid channel in the axial direction passes through the swirl vane 2, a swirl liquid flow SF is generated by the action of the swirl vane 2. The swirl liquid flow SF that has flowed out of the cylindrical tube portion 8 of the swirl vane 2 passes through the diameter-reduced portion 3, and the swirl radius is reduced while the flow velocity in the swirl direction is increased. As a result, a pressure difference (negative pressure) is generated between the reduced diameter portion 3 and the first gas introduction portion 4, so that the first gas introduction is caused on the outflow end side of the reduced diameter portion 3 by this pressure difference. The gas AR1 is sucked from the part 4. The sucked-in gas AR1 is brought into contact with the outer periphery of the swirling liquid flow SF at a position where it is united with the swirling liquid flow SF, and is sheared to generate fine bubbles in the bubble generating unit 6.

  FIG. 5 is a schematic cross-sectional view showing a state in which the microbubble generator 1A shown in FIG. 1 is cut at the position of the second gas introduction part 5A. A negative pressure is formed in the vicinity of the center of the liquid flow path through which the swirl liquid flow SF generated by the swirl vane 2 flows, due to the centrifugal force of the swirl liquid flow SF. Since the gas discharge port 51 formed at the tip of the second gas introduction part 5A is located in the vicinity of the center of the liquid flow path through which the swirling liquid flow SF flows, the pressure between the pressure near the center and the atmospheric pressure. Due to the difference (negative pressure), the gas AR2 is sucked from the second gas introduction part 5A. For this reason, as shown in FIG. 5, the gas AR2 introduced through the second gas introduction part 5A is discharged from the gas discharge port 51 and introduced into the liquid flow path, and the swirling liquid flow SF It is possible to make contact with the inner periphery. The gas AR <b> 2 introduced in this way is brought into contact with the inner periphery of the swirling liquid flow SF and sheared to generate fine bubbles in the bubble generating unit 6.

  According to the fine bubble generating device 1A as described above, the gas AR1 and the gas AR2 can be brought into contact with the outer periphery and the inner periphery of the swirl liquid flow SF, respectively, and therefore the contact between the liquid (swirl liquid flow SF) and the gas. Area and contact efficiency can be improved. As a result, the generation amount of fine bubbles can be stably increased.

  Here, in the case of a configuration provided with a plurality of intake ports (gas introduction portions) that unite the swirling liquid flow and the gas at the same position, the amount of gas introduced from one of the plurality of intake ports increases. As a result, a phenomenon occurs in which the amount of gas introduced from another intake port decreases, and the generation of fine bubbles becomes unstable. On the other hand, in the fine bubble generating device 1A of the present embodiment, the position at which the gas AR1 taken in from the first gas introduction part 4 is discharged into the liquid flow path (gas discharge port 41), and the second gas The position where the gas AR2 taken in from the introduction part 5A is discharged into the liquid flow path (gas discharge port 51) is different from the position in the axial direction of the liquid flow path (that is, the traveling direction of the swirl liquid flow SF). Yes. For this reason, it is possible to suppress a phenomenon in which the amount of the gas AR2 introduced from the second gas introduction unit 5A decreases when the amount of the gas AR1 introduced from the first gas introduction unit 4 increases. On the contrary, when the amount of the gas AR2 introduced from the second gas introduction part 5A increases, a phenomenon occurs in which the amount of the gas AR1 introduced from the first gas introduction part 4 decreases. Can be suppressed. Therefore, the gas introduction amount as a whole can be increased efficiently, and the generation amount of fine bubbles can be stably increased.

  Further, in the fine bubble generating apparatus 1A of the present embodiment, the swirl blade 2 generates the swirling liquid flow SF, so that a large amount of fine bubbles can be generated while reducing the pressure loss of the liquid. However, in the present invention, the configuration of the swirling liquid flow generating unit that generates the swirling liquid flow is not limited to this. For example, the liquid is caused to flow into the liquid channel from the tangential direction, and the liquid is allowed to flow. You may make it the structure which generate | occur | produces a turning liquid flow by making it turn along the internal peripheral surface of a path | route.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 6. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 6 is a cross-sectional view (longitudinal cross-sectional view) showing the fine bubble generating apparatus according to Embodiment 2 of the present invention. As shown in FIG. 6, the fine bubble generating device 1B according to the second embodiment includes a second gas introduction unit 5B instead of the second gas introduction unit 5A according to the first embodiment. The second gas introduction part 5 </ b> B is installed in the vicinity of the upstream side of the swirl vane 2. The second gas introduction part 5B has a cylindrical shape (or a tubular shape) and has a gas discharge port 51 at the tip. The cross-sectional shape of the second gas introduction part 5B is preferably, for example, circular. Further, the second gas introduction part 5B has a bent shape so that the tip side portion thereof is substantially parallel to the axial direction of the liquid channel and the gas discharge port 51 faces the downstream side of the liquid channel. It has become. An air supply means (not shown) such as a pump or a pressure tank is provided on the base end side of the second gas introduction part 5B, and the gas AR2 supplied by this air supply means is the second gas introduction part. The gas is discharged from the gas discharge port 51 through 5B. The gas AR2 discharged from the gas discharge port 51 is in a state located at the center of the liquid flow. In this way, the liquid flow containing the gas AR2 in the central portion passes through the swirl vane 2 to form the swirl liquid flow SF, so that the gas AR2 contacts the inner periphery of the swirl liquid flow SF.

  According to the fine bubble generating device 1B of the second embodiment, the gas AR1 and the gas AR2 can be brought into contact with the outer periphery and the inner periphery of the swirling liquid flow SF, respectively, so that the liquid and the gas are the same as in the first embodiment. It is possible to improve the contact area and the contact efficiency. As a result, the generation amount of fine bubbles can be stably increased. Further, in the fine bubble generating device 1B of the second embodiment, the second gas introduction unit 5B is arranged such that the tip side portion of the second gas introduction unit 5B is substantially parallel to the axial direction of the liquid flow path. Is bent, it is possible to reliably prevent the liquid flow from being disturbed by the gas AR2 discharged from the gas discharge port 51. For this reason, fine bubbles can be generated with higher efficiency. In particular, in the fine bubble generating device 1B of the second embodiment, since the gas discharge port 51 faces the downstream side of the liquid flow path, the gas AR2 is forwarded from the gas discharge port 51 to the forward direction of the liquid flow. Can be released. For this reason, it can suppress more reliably that a liquid flow is disturbed by gas AR2 discharge | released from the gas discharge port 51. FIG.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 7. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 7 is a cross-sectional view (longitudinal cross-sectional view) showing the microbubble generator of Embodiment 3 of the present invention. As shown in FIG. 7, the fine bubble generating device 1C of the third embodiment includes a second gas introduction unit 5C instead of the second gas introduction unit 5A in the first embodiment. The second gas introduction part 5 </ b> C is provided on the downstream side of the liquid flow channel with respect to the first gas introduction part 4. The second gas introduction portion 5C has a cylindrical shape (or a tubular shape), and the cross-sectional shape thereof is preferably, for example, a circle. The second gas introduction part 5C is disposed so as to extend in the liquid channel in a direction substantially perpendicular to the axial direction of the liquid channel. One end of the second gas introduction part 5C is in contact with or fixed to the inner wall of the liquid flow path. A gas discharge port 51 is formed on the side wall of the second gas introduction part 5C. The gas discharge port 51 is located in the central portion (near the center) of the liquid flow path. The shape of the gas discharge port 51 is not particularly limited, but is preferably circular. In the illustrated configuration, the gas discharge port 51 faces the upstream side of the liquid channel, but may face the downstream side. Since the gas discharge port 51 is located in the vicinity of the center of the swirling liquid flow SF, the gas AR2 is sucked from the outside into the second gas introduction part 5C by the negative pressure generated at this position. The gas AR2 introduced through the second gas introduction part 5C is discharged from the gas discharge port 51 into the liquid flow path, and contacts the inner periphery of the swirling liquid flow SF. The gas AR2 thus introduced comes into contact with the inner periphery of the swirling liquid flow SF and is sheared to generate fine bubbles.

  According to the fine bubble generating device 1C of the third embodiment, the gas AR1 and the gas AR2 can be brought into contact with the outer periphery and the inner periphery of the swirling liquid flow SF, respectively. It is possible to improve the contact area and the contact efficiency. As a result, the generation amount of fine bubbles can be stably increased. Further, since the gas discharge port 51 is directed in the axial direction of the liquid flow path, the swirling liquid flow SF can be reliably prevented from being disturbed by the gas AR2 discharged from the gas discharge port 51. For this reason, the fall of the shear force by the swirl liquid flow SF can be suppressed reliably, and fine bubbles can be generated with higher efficiency. In particular, in the fine bubble generating device 1C of the third embodiment, the gas discharge port 51 is formed on the side wall of the second gas introduction part 5C, so that the second gas introduction part 5C is not bent. The gas discharge port 51 can be directed in the axial direction of the liquid flow path.

  The swirl liquid flow SF generated by the swirl vanes 2 generates fine bubbles by shearing the gas AR1 introduced from the first gas introduction part 4 and the gas AR2 introduced from the second gas introduction part 5C. . According to the fine bubble generating device 1C of the third embodiment, the fine bubbles generated in the bubble generation unit 6 circulate downstream together with the swirl liquid flow SF and contact the outer wall of the second gas introduction unit 5C. When the fine bubbles come into contact with the second gas introduction part 5C, among the fine bubbles generated during the shearing of the swirling liquid flow SF, the relatively large-sized bubbles are crushed again and subdivided into smaller-sized fine bubbles. Is done. In the third embodiment, when the gas AR1 introduced from the first gas introduction part 4 or the gas AR2 introduced from the second gas introduction part 5C is sheared by the swirling liquid flow SF by such a structure. It is possible to increase the amount of fine bubbles by re-crushing the bubbles that were insufficiently sheared. In particular, in the present embodiment, since the gas discharge port 51 faces the upstream side of the liquid flow path, the shearing is insufficient when the gas AR2 discharged from the gas discharge port 51 is sheared by the swirling liquid flow SF. The bubbles that have been in contact with the outer wall of the second gas introduction part 5C can be crushed again.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. 8. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 8 is a partial cross-sectional view (longitudinal cross-sectional view) of the fine bubble generating apparatus according to Embodiment 4 of the present invention. The fine bubble generating device of the fourth embodiment is different from the second gas introducing portion 5A of the first embodiment except that it includes a second gas introducing portion 5D shown in FIG. Same as 1.

  The second gas introduction unit 5D is disposed on the downstream side of the liquid flow path from the swirl liquid flow generation unit (swirl blade 2). The second gas introduction part 5D has a cylindrical shape (or a tubular shape), and the cross-sectional shape thereof is preferably, for example, a circle. The second gas introduction part 5D has a shape bent in the upstream direction of the liquid flow path so that the portion 53 on the tip side is substantially parallel to the axial direction of the liquid flow path. The distal end portion of the second gas introduction portion 5D is branched into a plurality (two in the illustrated configuration), and a gas discharge port 51 is formed for each branched branch 54. The gas AR <b> 2 introduced from the second gas introduction part 5 </ b> D branches into each branch 54 and is discharged from the gas discharge port 51 at the tip of each branch 54.

  According to the fine bubble generating device of the fourth embodiment, the gas AR1 and the gas AR2 can be brought into contact with the outer periphery and the inner periphery of the swirling liquid flow SF, respectively. The contact area and the contact efficiency can be improved. As a result, the generation amount of fine bubbles can be stably increased. Further, in the fine bubble generating device of the fourth embodiment, the second gas introduction part 5D is arranged such that the tip side portion 53 of the second gas introduction part 5D is substantially parallel to the axial direction of the liquid flow path. Since the curved shape is bent, the swirling liquid flow SF can be reliably prevented from being disturbed by the gas AR2 discharged from the gas discharge port 51. For this reason, the fall of the shear force by the swirl liquid flow SF can be suppressed reliably, and fine bubbles can be generated with higher efficiency. Further, according to the fine bubble generating device of the fourth embodiment, the tip portion of the second gas introduction part 5D is branched into the plurality of branches 54, and the gas AR2 is discharged from the gas discharge ports 51 of the branches 54, respectively. Thus, the gas AR2 can be brought into contact with the entire inner periphery of the swirling liquid flow SF. For this reason, since the contact surface of the inner periphery of the swirling liquid flow SF and the gas AR2 can be further increased, the generation amount of fine bubbles can be further increased.

Embodiment 5 FIG.
Next, a fifth embodiment of the present invention will be described with reference to FIG. 9. The description will focus on the differences from the fourth embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 9 is a partial cross-sectional view (longitudinal cross-sectional view) of the microbubble generator of Embodiment 5 of the present invention. The fine bubble generator of the fifth embodiment is the same as that of the fourth embodiment except that the bubble crushing unit 11 is provided.

  As shown in FIG. 9, the bubble crushing part 11 is comprised by the protrusion part which protrudes toward the inside of a liquid flow path from the inner wall of a liquid flow path. Although the shape of the bubble crushing part 11 is not specifically limited, For example, a cylindrical shape etc. are preferable. The bubble crushing unit 11 is disposed on the downstream side of the liquid flow path from the gas discharge port 41 of the first gas introduction unit 4 and the gas discharge port 51 of the second gas introduction unit 5D. In the configuration shown in FIG. 9, the bubble crushing part 11 is arranged so that the axial position of the liquid flow path is substantially the same as the bent part of the second gas introduction part 5D.

  According to the fifth embodiment, in addition to the same effects as in the fourth embodiment, the following effects can be obtained. In other words, the fine bubbles generated by shearing the gas AR1 introduced from the first gas introduction part 4 and the gas AR2 introduced from the second gas introduction part 5D by the swirl liquid flow SF together with the swirl liquid flow SF are downstream. To the bubble crushing portion 11. Thereby, among the fine bubbles generated at the time of shearing by the swirl liquid flow SF, the bubbles having a relatively large diameter are re-crushed and subdivided into fine bubbles having a smaller diameter. Thus, according to the fifth embodiment, the gas AR1 introduced from the first gas introduction part 4 and the gas AR2 introduced from the second gas introduction part 5D are sheared by the swirling liquid flow SF. Since the bubbles that have been insufficiently sheared can be crushed again by the bubble crushing portion 11, the amount of fine bubbles can be further increased.

Embodiment 6 FIG.
Next, the sixth embodiment of the present invention will be described with reference to FIG. 10. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 10 is a partial cross-sectional view (longitudinal cross-sectional view) of the microbubble generator according to Embodiment 6 of the present invention. The fine bubble generating apparatus of the sixth embodiment is the same as that of the first embodiment except that the second gas introducing section 5E shown in FIG. 10 is provided instead of the second gas introducing section 5A of the first embodiment. Same as 1.

  The second gas introduction part 5E is arranged on the downstream side of the liquid flow path from the swirl liquid flow generation part (swirl blade 2). The second gas introduction part 5E has a cylindrical shape (or a tubular shape), and the cross-sectional shape thereof is preferably, for example, a circle. The second gas introduction part 5E has a shape bent in the downstream direction of the liquid flow path so that the portion 55 on the tip side is substantially parallel to the axial direction of the liquid flow path. The distal end portion of the second gas introduction portion 5E is branched into a plurality (two in the illustrated configuration), and a gas discharge port 51 is formed for each branched branch 56. The gas AR <b> 2 introduced from the second gas introduction part 5 </ b> E branches into each branch 56 and is discharged from the gas discharge port 51 at the tip of each branch 56.

  According to the fine bubble generating device of the sixth embodiment, the gas AR1 and the gas AR2 can be brought into contact with the outer periphery and the inner periphery of the swirling liquid flow SF, respectively. The contact area and the contact efficiency can be improved. As a result, the generation amount of fine bubbles can be stably increased. In the fine bubble generating device of the sixth embodiment, the second gas introduction part 5E is arranged so that the tip 55 of the second gas introduction part 5E is substantially parallel to the axial direction of the liquid flow path. Since the curved shape is bent, the swirling liquid flow SF can be reliably prevented from being disturbed by the gas AR2 discharged from the gas discharge port 51. For this reason, the fall of the shear force by the swirl liquid flow SF can be suppressed reliably, and fine bubbles can be generated with higher efficiency. Further, according to the fine bubble generating device of the sixth embodiment, the distal end portion of the second gas introduction part 5E is branched into the plurality of branches 56, and the gas AR2 is discharged from the gas discharge ports 51 of each branch 56, respectively. Thus, the gas AR2 can be brought into contact with the entire inner periphery of the swirling liquid flow SF. For this reason, since the contact surface of the inner periphery of the swirling liquid flow SF and the gas AR2 can be further increased, the generation amount of fine bubbles can be further increased. Furthermore, in the sixth embodiment, the tip 55 of the second gas introduction part 5E is bent in the downstream direction of the liquid flow path, and the gas discharge port 51 faces the downstream side of the liquid flow path. Therefore, the gas AR2 can be discharged from the gas discharge port 51 in the forward direction with respect to the traveling direction of the swirl liquid flow SF. For this reason, since the gas AR2 can be brought into contact with the inner periphery of the swirl liquid flow SF without disturbing the swirl liquid flow SF, a decrease in shearing force due to the swirl liquid flow SF can be more reliably suppressed. As a result, it is possible to further increase the generation amount of fine bubbles.

Embodiment 7 FIG.
Next, a seventh embodiment of the present invention will be described with reference to FIG. 11. The description will focus on the differences from the sixth embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 11 is a partial cross-sectional view (longitudinal cross-sectional view) of the fine bubble generating apparatus according to Embodiment 7 of the present invention. The fine bubble generator of the seventh embodiment is the same as that of the sixth embodiment except that the bubble crushing unit 11 is provided.

  As shown in FIG. 11, the bubble crushing part 11 is configured by a protruding part that protrudes from the inner wall of the liquid channel toward the inside of the liquid channel. Although the shape of the bubble crushing part 11 is not specifically limited, For example, a cylindrical shape etc. are preferable. The bubble crushing unit 11 is disposed on the downstream side of the liquid flow path from the gas discharge port 41 of the first gas introduction unit 4 and the gas discharge port 51 of the second gas introduction unit 5E.

  According to the seventh embodiment, in addition to the same effects as in the sixth embodiment, the following effects can be obtained. That is, the fine bubbles generated by shearing the gas AR1 introduced from the first gas introduction part 4 and the gas AR2 introduced from the second gas introduction part 5E by the swirl liquid flow SF are downstream together with the swirl liquid flow SF. To the bubble crushing portion 11. Thereby, among the fine bubbles generated at the time of shearing by the swirl liquid flow SF, the bubbles having a relatively large diameter are re-crushed and subdivided into fine bubbles having a smaller diameter. Thus, according to the seventh embodiment, the gas AR1 introduced from the first gas introduction part 4 and the gas AR2 introduced from the second gas introduction part 5E are sheared by the swirling liquid flow SF. Since the bubbles that have been insufficiently sheared can be crushed again by the bubble crushing portion 11, the amount of fine bubbles can be further increased.

  As mentioned above, although embodiment of the microbubble generator of this invention was described, in the microbubble generator of this invention, you may implement combining the characteristic of several embodiment mentioned above by arbitrary combinations.

Embodiment 8 FIG.
Next, with reference to FIG. 12, an embodiment of a bath water heater provided with the fine bubble generator of the present invention will be described. As shown in FIG. 12, the bath water heater 150 of the present embodiment includes a heat pump unit 110 as a heat source unit and a tank unit 120. The heat pump unit 110 has a refrigeration cycle unit 117 configured by a compressor 111, a boiling heat exchanger 112, an expansion valve 113, an evaporator 114, and a circulation pipe 115 that connects these in an annular shape. ing. In the refrigeration cycle unit 117, a refrigerant such as carbon dioxide is compressed by the compressor 111 to become high temperature and high pressure, and then radiated by the heating heat exchanger 112, depressurized by the expansion valve 113, and absorbed by the evaporator 114. Then, the gas becomes a gas state and is sucked into the compressor 111.

  On the other hand, the tank unit 120 includes a hot water storage tank 20, a water supply line 30, a hot water circulation line 40, a tank side circulation line 50, a bath side circulation line 60, a reheating heat exchanger 70, and a first hot water supply line. 75, a bath-side hot / cold water mixing valve 80a, a general hot-water / water mixing valve 80b, a second hot-water supply line 90, a third hot-water supply line 95, and the like.

  The hot water storage tank 20 is a stacked tank that stores water supplied from the water supply pipe 30 and stores hot water boiled by the heat pump unit 110. In the lower part of the hot water storage tank 20, a water inlet 20 a to which the water supply pipe 30 is connected and a water outlet 20 b to which the forward pipe 40 a of the hot water circulation pipe 40 is connected are provided. At the upper part of the hot water storage tank 20, a hot water inlet 20 c to which the return pipe 40 b of the hot water circulation pipe 40 is connected and a hot water outlet 20 d to which the first hot water supply pipe 75 is connected are provided. The hot water storage tank 20 is always kept in a full state by supplying water from the water supply pipe 30.

  The water supply line 30 is a line for supplying water such as city water to the hot water storage tank 20, the bath-side hot / cold water mixing valve 80 a, the general hot water / water mixing valve 80 b, and the general hot water supply destination 180. It has 3rd water supply pipe parts 30a-30c. The pressure reducing valve 25 is provided in the middle of the first water supply pipe section 30a, and reduces the water pressure from a water source such as a water supply to a predetermined value. The 1st water supply pipe part 30a connects the water source and the water inlet 20a of the hot water storage tank 20, and the 2nd water supply pipe part 30b branches from the 1st water supply pipe part 30a with the pressure-reduction valve 25, and this 1st water supply pipe part 30a is connected to the bath-side hot / cold water mixing valve 80a and the general-side hot / cold water mixing valve 80b, and the third water supply pipe 30c is branched from the first water supply pipe 30a upstream of the pressure reducing valve 25. 30a and general hot water supply destination 180 are connected. The general hot water supply 180 is a hot water supply that a user operates directly by hand (including the case where the sensor is opened in response to a sensor), for example, a sink, a sink faucet, a bathroom shower, etc. It is.

  The hot water storage circulation line 40 is a pipe that reaches from the water outlet 20b at the lower part of the hot water tank 20 to the hot water inlet 20c at the upper part of the hot water tank 20 via the heating heat exchanger 112 of the heat pump unit 110. It has a forward pipe 40a provided with a water supply pump 33 and an electric three-way valve 35, a return pipe 40b, and a bypass pipe 40c branched from the forward pipe 40a by the three-way valve 35. The forward pipe 40a connects the water outlet 20b and the boiling heat exchanger 112, the return pipe 40b connects the boiling heat exchanger 112 and the hot water inlet 20c, and the bypass pipe 40c is connected to the three-way valve 35. The return pipe 40b is connected.

  The tank-side circulation pipe 50 is a pipe that reaches the lower part of the hot water storage tank 20 from the hot water outlet 20d at the upper part of the hot water storage tank 20 via the reheating heat exchanger 70. The forward pipe 50a and the tank side water supply pump 45 And a return pipe 50b. The forward pipe 50a connects the hot water outlet 20d and the hot water inlet 70a above the reheating heat exchanger 70, and the return pipe 50b connects the hot water outlet 70b below the reheating heat exchanger 70 and the lower part of the hot water storage tank 20. Connect.

  The bath-side circulation pipe 60 is a pipe that returns from the bathtub 170 to the bathtub 170 via the reheating heat exchanger 70, and has an outward pipe 60a and a return pipe 60b. The forward pipe 60 a connects the bathtub 170 and the bath water introduction port 70 c below the reheating heat exchanger 70, and the return pipe 60 b connects the bath water outlet 70 d above the reheating heat exchanger 70 and the bathtub 170. The forward pipe 60a is provided with a flow switch 58, a water level sensor 59, and a bath-side water supply pump 57 (circulation pump) in this order from the reheating heat exchanger 70 side to the upstream side (tub 170 side). ing. The bath-side water supply pump 57 draws bath water from the bathtub 170, circulates it in the bath-side circulation pipe 60, and returns it to the bathtub 170. A bathtub adapter 165 is provided at a connecting portion between the forward pipe 60 a and the return pipe 60 b and the bathtub 170.

  In the bathtub adapter 165, two pipe connection portions are provided so that the forward pipe 60a and the return pipe 60b can be connected. In the middle of the return pipe 60b in the vicinity of the connection portion between the bathtub adapter 165 and the return pipe 60b, the fine bubble generator 1 of the present invention is arranged. As the configuration of the microbubble generator 1, any of the first to seventh embodiments described above can be used. The fine bubble generating apparatus 1 is provided with an electromagnetic valve 61 that can open and close the inlets of the first gas introduction unit 4 and the second gas introduction unit 5.

  The bath water heater 150 further includes a control unit 100 and a remote control device 101 installed on the wall of a bathroom or kitchen. The user can set the hot water supply temperature and various operation modes using the remote control device 101. Based on the information detected by each of the sensors described above and the information transmitted from the remote control device 101, the control unit 100 performs heat pump unit 110, hot water storage water pump 33, three-way valve 35, tank-side water pump 45, bath By controlling the side water pump 57, the bath-side hot / cold water mixing valve 80a, the general-side hot / cold water mixing valve 80b, and the electromagnetic valves 61, 56, and 59, various operations of the bath hot water supply device 150 are controlled.

  When hot water is supplied to the bathtub 170, the hot water supplied from the hot water storage tank 20 and the water supplied from the water supply pipe 30 are mixed at the bath side hot water mixing valve 80a so as to reach a set temperature, and the mixing is performed. The hot water is sent through the second hot water supply pipe 90 and the bath-side circulation pipe 60 and supplied into the bathtub 170 through the bathtub adapter 165.

  When hot water is supplied to the general hot water supply 180, the hot water supplied from the hot water storage tank 20 and the water supplied from the water supply pipe 30 are mixed at the general hot water mixing valve 80b so as to reach a set temperature, The mixed hot water is sent through the third hot water supply pipe 95 and supplied to the general hot water supply destination 180.

  During the reheating operation in which the bath water in the bathtub 170 is kept warm or heated, the tank-side water pump 45 and the bath-side water pump 57 are driven. As a result, the bath water drawn from the bathtub 170 through the bathtub adapter 165 to the outgoing pipe 60 a is sent to the reheating heat exchanger 70, and hot water is added from the hot water storage tank 20 through the tank-side circulation line 50. The water is supplied to the soaking heat exchanger 70, and the bath water is heated in the soaking heat exchanger 70. The heated bath water returns to the bathtub 170 through the return pipe 60 b and flows into the bathtub 170 from the bathtub adapter 165. At this time, by opening the electromagnetic valve 61 provided in the fine bubble generating device 1, air is sucked from the first gas introducing portion 4 and the second gas introducing portion 5 and introduced into the fine bubble generating device 1, The introduced air is mixed in the bath water to generate a large amount of fine bubbles, which can be supplied into the bathtub 170. Moreover, since the fine bubble generator 1 can continuously generate fine bubbles by continuously driving the bath-side water supply pump 57, the fine bubble concentration in the bathtub 170 can be increased. . At this time, only the bath-side water pump 57 is driven without driving the tank-side water pump 45, and only the operation of supplying the micro-bubbles from the micro-bubble generating device 1 into the bathtub 170 without the reheating operation is performed. Also good.

  In the third embodiment described above, the embodiment in which the fine bubble generating device of the present invention is provided in the bath hot water supply device has been described. However, the fine bubble generating device of the present invention is not limited to such an application. It can also be preferably used as a parts washing apparatus in the manufacturing process of the above, or a dissolved oxygen enrichment apparatus for the purpose of bioactivation.

1, 1A, 1B, 1C Fine bubble generator, 2 swirl vanes, 3 reduced diameter part, 4 first gas introduction part, 5, 5A, 5B, 5C, 5D, 5E second gas introduction part, 6 bubble generation Part, 7 blades, 8 cylindrical pipe part, 11 bubble crushing part, 20 hot water storage tank, 20a water inlet, 20b water outlet, 20c hot water inlet, 20d hot water outlet, 25 pressure reducing valve, 30 water supply line, 30a first 1 water supply pipe section, 30b second water supply pipe section, 30c third water supply pipe section, 33 hot water storage water pump, 35 three-way valve, 40 hot water storage circulation pipe, 40a forward pipe, 40b return pipe, 40c bypass pipe, 41, 51 Gas discharge port, 45 Tank side water supply pump, 50 Tank side circulation pipe, 50a Outward pipe, 50b Return pipe, 53, 55 Tip side part, 54, 56 branches, 57 Bath side water supply pump, 58 Flow switch 59 Water level sensor, 60 Bath side circulation line, 60a Outward pipe, 60b Return pipe, 61 Solenoid valve, 70 Heat exchanger for reheating, 70a Hot water inlet, 70b Hot water outlet, 70c Bath water inlet, 70d Bath water Outlet port, 75 first hot water supply line, 80a bath side hot water mixing valve, 80b general side hot water mixing valve, 90 second hot water supply line, 95 third hot water supply line, 100 control unit, 101 remote control device, 110 heat pump unit, 111 compressors, 112 heat exchangers for boiling, 113 expansion valves, 114 evaporators, 115 circulation piping, 117 refrigeration cycle units, 120 tank units, 150 bath water heaters, 165 bathtub adapters, 170 bathtubs, 180 general hot water destinations

Claims (12)

A swirling liquid flow generating section for generating a swirling liquid flow in the liquid flow path;
A reduced diameter portion for reducing the swirl diameter of the swirl liquid flow;
A first gas introduction part that takes in gas from outside the liquid flow path to the downstream side of the liquid flow path from the swirl liquid flow generation part so that the gas contacts the outer periphery of the swirl liquid flow ;
A second gas introduction part that takes in the gas from outside the liquid flow path to the downstream side of the liquid flow path from the swirl liquid flow generation part so that the gas contacts the inner periphery of the swirl liquid flow ;
With
A fine bubble generating device that generates fine bubbles by the swirling liquid flow, the gas taken in from the first gas introduction unit, and the gas taken in from the second gas introduction unit.   The position where the gas taken in from the first gas introduction part is released into the liquid flow path and the position where the gas taken in from the second gas introduction part is released into the liquid flow path The fine bubble generating device according to claim 1, wherein positions of the liquid flow paths in the axial direction are different.   3. The fine bubble generating device according to claim 1, wherein the second gas introduction unit has a gas discharge port located at a central portion of the liquid flow path, and discharges the taken-in gas from the gas discharge port.   The fine bubble generating apparatus according to claim 3, wherein the gas discharge port is formed at a tip of the second gas introduction part.   The fine bubble generating device according to claim 4, wherein the second gas introduction portion is bent so that a portion on a tip side thereof is substantially parallel to an axial direction of the liquid flow path.   The microbubble generator according to any one of claims 3 to 5, wherein the gas discharge port faces the downstream side of the liquid channel.   The microbubble generator according to any one of claims 3 to 5, wherein the gas discharge port faces an upstream side of the liquid channel.   6. The fine bubble generating device according to claim 5, wherein a tip portion of the second gas introduction part is branched into a plurality of branches, and each of the branched branches has the gas discharge port. The second gas introduction part has a cylindrical shape,
The fine bubble generating device according to claim 3, wherein the gas discharge port is formed in a side wall of the second gas introduction part.   The fine bubble generating device according to any one of claims 1 to 9, wherein the swirling liquid flow generating section includes blades disposed in the liquid flow path, and the liquid flow is swirled by the blades.   The microbubble generator according to any one of claims 1 to 10, further comprising a bubble crushing section that re-crushes the generated fine bubbles.   A bath hot water supply device comprising the fine bubble generating device according to any one of claims 1 to 11.

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