JP2014168761A - Gas and liquid mixing device and bath hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas and liquid mixing device capable of suppressing generated fine bubbles from increasing in diameter even when a gas introduction amount increases, and a bath hot water supply device with the same.SOLUTION: A gas and liquid mixing device 1A includes: a revolving liquid flow generation part 3 which generates a revolving liquid flow in a flow passage of a liquid; a revolving liquid flow acceleration part 4 which reduces the revolving diameter of the revolving liquid flow; a gas introduction part 6A which introduces a gas from outside; a gas and liquid mixing part 5A which generate fine bubbles by making the revolving liquid flow and the gas introduced by the gas introduction part 6A flow together; and introduced gas dispersing means 7A of dispersing the gas flowing together with the revolving liquid flow.

Description

  The present invention relates to a gas-liquid mixing apparatus capable of refining an introduced gas and mixing it with a liquid, and a bath water heater provided with the same.

  As means for uniformly mixing a gas in a liquid or generating fine bubbles, for example, a Venturi type, a cavitation type, a pressure dissolution type, a swirl type or the like is used. 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 gas is sucked in from the outside, and the pressure rises in the part where the constriction spreads, so the bubbles are fine (For example, refer to Patent Document 1). In the cavitation type, a gas-liquid mixture is sent into a pump, and bubbles are generated using cavitation by applying ultrasonic vibration, for example. The pressure-dissolving type 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 bubbles reprecipitate when the pressure is released. It is possible to dissolve a large amount of gas. Further, in the swirl type, a swirl flow of liquid is formed and combined with the gas, so that the gas is sheared and pulverized by the swirl flow (see, for example, Patent Document 2).

JP 2007-144394 A Japanese Patent No. 4525890

  In order to increase the generation amount of fine bubbles, it is necessary to increase the gas introduction amount. On the other hand, in the case where the specifications of the pump that forms the liquid flow are limited, the flow rate in the path, the head, the hydraulic pressure, and the like are limited. Since the turning force largely depends on the flow rate, the head, and the hydraulic pressure, the obtained turning force is limited. When the gas introduction amount is increased, the entire amount of the introduced gas cannot be sheared, so that there is a problem that large bubbles are also generated.

  The present invention has been made in order to solve the above-described problems, and a gas-liquid mixing device capable of suppressing the expansion of the diameter of the generated fine bubbles even when the amount of gas introduction increases, and the It aims at providing the provided hot-water supply apparatus.

  A gas-liquid mixing apparatus according to the present invention includes a swirling liquid flow generating unit that generates a swirling liquid flow in a liquid flow path, a swirling liquid flow accelerating unit that reduces the swirling diameter of the swirling liquid flow, and gas from the outside. The gas introduction part to be introduced, the swirling liquid flow, and the gas taken in from the gas introduction part are joined to form a gas-liquid mixing part for generating fine bubbles, and the introduction gas dispersion to disperse the gas to be joined to the swirling liquid flow Means.

  According to the present invention, it is possible to suppress the expansion of the diameter of the generated fine bubbles even if the gas introduction amount is increased.

It is a longitudinal cross-sectional view which shows the gas-liquid mixing apparatus of Embodiment 1 of this invention. It is the figure which expanded a part of gas-liquid mixing apparatus shown in FIG. It is a perspective view of the fixed wing | blade with which the gas-liquid mixing apparatus shown in FIG. 1 is provided. It is a longitudinal cross-sectional view which shows the gas-liquid mixing apparatus of Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the gas-liquid mixing apparatus of Embodiment 2 of this invention. FIG. 6 is a cross-sectional view (transverse cross-sectional view) taken along line XX in FIG. 4. It is a longitudinal cross-sectional view which shows the gas-liquid mixing apparatus of Embodiment 3 of this invention. It is the YY sectional view taken on the line in FIG. It is a block diagram which shows embodiment of the bath hot-water supply apparatus 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 longitudinal sectional view showing a gas-liquid mixing apparatus according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a part of the gas-liquid mixing apparatus shown in FIG. FIG. 3 is a perspective view of a fixed wing provided in the gas-liquid mixing apparatus shown in FIG. A gas-liquid mixing apparatus 1A of the present embodiment shown in these drawings is provided in a liquid flow path, and introduces and mixes gas into the liquid.

  As shown in FIG. 1, the gas-liquid mixing apparatus 1 </ b> A includes a swirl liquid flow generation unit 3 that swirls the liquid flow, and a swirl liquid flow acceleration unit 4 that reduces the diameter of the swirl liquid flow generated by the swirl liquid flow generation unit 3. And a gas-liquid mixing part 5A provided on the downstream side of the swirling liquid flow acceleration part 4, a gas introduction part 6A for taking in gas from the outside, an introduction gas dispersion means 7A, and a diameter expansion part 9. In FIG. 1, the liquid proceeds from the left to the right in the gas-liquid mixing apparatus 1A. Hereinafter, the traveling direction of the liquid is referred to as “traveling direction TD”.

  The swirling liquid flow generation unit 3 has a substantially cylindrical internal space centered on a straight line parallel to the traveling direction TD. The inner diameter of the swirling liquid flow generating unit 3 is substantially constant along the traveling direction TD. As shown in FIG. 3, fixed wings 8 are installed in the swirling liquid flow generation unit 3. In the present embodiment, a plurality (two in the illustrated configuration) of fixed wings 8 are provided. Each fixed blade 8 is fixed to the inner wall of the flow path of the swirling liquid flow generating unit 3. The liquid flow that has flowed into the gas-liquid mixing apparatus 1 </ b> A passes through the fixed blade 8, and is swirled around the axis of the swirling liquid flow generating unit 3 to generate a swirling liquid flow. The fixed wing 8 is formed so that the upstream portion is formed in a direction substantially parallel to the traveling direction TD, and the downstream portion is formed in an arc shape that rises in a direction substantially perpendicular to the traveling direction TD. The smaller the chord angle of the arc shape, the faster the rising shape, which is preferable in that a high-speed swirling fluid flow rate can be formed. On the other hand, in a wing shape with a small chord angle, pressure loss is high, and since the opening area of the flow path is small, foreign matters such as hair are easily clogged between the wings. In the illustrated configuration, the clogging of foreign matter can be suppressed by providing a gap 10 through which the foreign matter can pass between the two fixed blades 8.

  The swirl liquid flow acceleration unit 4 is provided concentrically with the swirl liquid flow generation unit 3 on the downstream side of the swirl liquid flow generation unit 3. The inner diameter of the swirling liquid flow acceleration unit 4 is continuously or multistagely reduced in the traveling direction TD. The swirling fluid flow acceleration unit 4 of the present embodiment has a substantially conical (substantially truncated cone) internal space. The inner diameter of the upstream end of the swirl fluid flow acceleration unit 4 is equal to the inner diameter of the swirl fluid flow generation unit 3. The minimum inner diameter portion where the inner diameter of the swirling liquid flow acceleration unit 4 is the smallest is located at the downstream end of the swirling liquid flow acceleration unit 4.

  The swirling liquid flow generated by the swirling liquid flow generating unit 3 is accelerated by passing through the swirling liquid flow accelerating unit 4 and reducing the swirling diameter. In the swirling fluid flow acceleration unit 4, it is desirable to increase the speed of the swirling fluid flow by reducing the diameter while reducing the pressure loss as much as possible. For this purpose, it is desirable that the inner wall surface of the swirling liquid flow acceleration unit 4 is formed of a material having high density and low roughness.

  The gas-liquid mixing unit 5 </ b> A is provided concentrically with the swirl liquid flow acceleration unit 4 on the downstream side of the swirl liquid flow acceleration unit 4. The inner diameter of the gas-liquid mixing section 5A is substantially the same diameter (length indicated by α in FIG. 1) as the minimum inner diameter of the swirling liquid flow acceleration section 4. In the present embodiment, an enlarged diameter portion 9 whose inner diameter continuously increases toward the traveling direction TD is provided on the downstream side of the gas-liquid mixing portion 5A.

  6 A of gas introduction parts are formed so that it may protrude outward from the outer peripheral part of 5 A of gas-liquid mixing parts. A gas passage 6a serving as a flow path through which the gas introduced into the gas-liquid mixing unit 5A passes is formed in the gas introduction unit 6A. The gas passage 6a is formed so as to penetrate from the outer peripheral side of the gas-liquid mixing unit 5A into the gas-liquid mixing unit 5A. In the illustrated configuration, the gas passage 6a is in a direction substantially orthogonal to the traveling direction TD, but the gas passage 6a may be inclined with respect to the traveling direction TD. Although not shown, it is preferable that the gas introduction unit 6A is provided with a check valve for preventing the liquid from flowing back to the gas introduction unit 6A when the operation is stopped.

  When the swirling liquid flow accelerated by the swirling liquid flow accelerating unit 4 flows into the gas-liquid mixing unit 5A, a negative pressure is generated in the gas-liquid mixing unit 5A, and the gas is introduced from the gas introduction unit 6A by this negative pressure. Naturally sucked into the gas-liquid mixing unit 5A. In the gas-liquid mixing unit 5A, the accelerated swirling liquid flow and the gas introduced from the gas introduction unit 6A join (unify) to generate fine bubbles. In the present embodiment, the gas is sheared and crushed by the swirling liquid flow, and is refined and mixed efficiently in the liquid, so that a large amount of fine bubbles can be efficiently generated.

  As shown in FIG. 2, the introduction gas dispersion means 7A in the present embodiment is configured by a mesh-like or porous plate-like member having a plurality of holes 7a through which gas can pass. The introduction gas dispersion means 7A is provided near the boundary between the gas introduction part 6A and the gas-liquid mixing part 5A, that is, near the outlet of the gas introduction part 6A. In the present embodiment, the introduction gas dispersion means 7A is disposed so as to cover the outlet of the gas passage 6a. The gas introduced from the gas introduction part 6A flows into the gas-liquid mixing part 5A through the hole 7a of the introduction gas dispersion means 7A, and joins the swirl liquid flow.

  When the flow rate of the liquid flow flowing into the gas-liquid mixing apparatus 1A is large, or when the pressure downstream of the gas-liquid mixing apparatus 1A is low, the amount of gas flowing in from the gas introduction unit 6A increases. Even when the amount of introduced gas increases as described above, the introduced gas is dispersed through the plurality of holes 7a of the introduction gas dispersion means 7A when joining the swirling liquid flow. And the bubbles are further sheared by the swirling liquid flow. For this reason, the diameter of the fine bubbles generated by being sheared by the swirling liquid flow can be maintained substantially constant, and the generation of a mixture of fine bubbles having a large diameter (for example, a bubble diameter of 100 μm or more) is reliably suppressed. be able to. In particular, in the present embodiment, the introduced gas dispersion means 7A is constituted by a mesh-like or porous member, so that the introduced gas can be finely dispersed through the numerous holes 7a. Thereby, the production | generation of a microbubble with a large diameter can be suppressed more reliably.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 4 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. The description is omitted. 4 and 5 are longitudinal sectional views showing a gas-liquid mixing apparatus according to Embodiment 2 of the present invention. The cut surface of FIG. 4 and the cut surface of FIG. 5 are orthogonal to each other. 6 is a cross-sectional view (transverse cross-sectional view) taken along line XX in FIG.

  As shown in FIGS. 4 and 5, the gas-liquid mixing device 1B of the second embodiment includes a swirling liquid flow generating unit 3, a swirling liquid flow accelerating unit 4, a gas-liquid mixing unit 5B, and a gas introducing unit 6B. And an introduction gas dispersion means 7B and an enlarged diameter portion 9.

  The gas-liquid mixing unit 5 </ b> B is provided concentrically with the swirl liquid flow acceleration unit 4 on the downstream side of the swirl liquid flow acceleration unit 4. The inner diameter of the gas-liquid mixing section 5B is larger than the minimum inner diameter of the swirling liquid flow acceleration section 4. In the present embodiment, the inner diameter of the gas-liquid mixing unit 5B is substantially constant along the traveling direction TD. That is, the gas-liquid mixing part 5B has a substantially cylindrical internal space.

  Further, the gas-liquid mixing device 1B has a gas-liquid mixing unit that extends from the downstream end 4a of the inner peripheral surface of the swirling liquid flow acceleration unit 4 (that is, the inner periphery of the minimum inner diameter portion of the swirling liquid flow acceleration unit 4) to the outer peripheral side. A ring-shaped wall surface 2 is formed as an inner wall surface connected to the upstream end 5a of the inner peripheral surface of 5B. In the illustrated configuration, the ring-shaped wall surface 2 forms an annular plane perpendicular to the traveling direction TD. The ring-shaped wall surface 2 is not limited to the illustrated configuration, and a part or all of the ring-shaped wall surface 2 may be configured by a curved surface. In addition, an R (R) shape is formed at the corner between the inner peripheral surface of the gas-liquid mixing unit 5B and the ring-shaped wall surface 2 or at the corner between the inner peripheral surface of the swirling liquid flow acceleration unit 4 and the ring-shaped wall surface 2. You may provide roundness like.

  As shown in FIG. 6, the gas introduction part 6B is configured to allow gas to flow into the gas-liquid mixing part 5B along the tangential direction of the inner peripheral surface of the gas-liquid mixing part 5B. That is, the gas introduction part 6B is configured as follows. A straight line obtained by extending the center line of the gas introduction part 6B into the gas-liquid mixing part 5B does not pass through the center of the gas-liquid mixing part 5B but passes through a position shifted from the center. Further, in the cross section as shown in FIG. 6 in which the gas-liquid mixing unit 5B and the gas introduction unit 6B are cut along a plane orthogonal to the traveling direction TD, the distance from the center of the gas-liquid mixing unit 5B is the inner wall of the gas introduction unit 6B. The far inner wall 6b is tangent to the inner peripheral surface of the gas-liquid mixing part 5B. Or in the said cross section, the inner wall 6b does not necessarily correspond to the tangent of the internal peripheral surface of the gas-liquid mixing part 5B, and the streamline parallel to the inner wall 6b in the vicinity of the inner wall 6b is shown in the gas-liquid mixing part 5B. The straight line extending inward may be a tangent to a circle having a diameter that is equal to or smaller than the inner diameter of the gas-liquid mixing unit 5B and larger than the minimum inner diameter of the swirling liquid flow acceleration unit 4.

  As shown in FIG. 6, the gas introduction part 6B is configured to flow the gas into the gas-liquid mixing part 5B along the tangential direction of the inner peripheral surface of the gas-liquid mixing part 5B. In addition, the gas that has flowed into the gas-liquid mixing unit 5B through the gas introduction unit 6B is moved in a predetermined direction along the inner peripheral surface of the gas-liquid mixing unit 5B (in this embodiment, counterclockwise in FIG. 6). It can be turned efficiently.

  The introduction gas dispersion means 7B is provided concentrically in the gas-liquid mixing unit 5B. The introduction gas dispersion means 7B is composed of a cylindrical member (cylindrical member) having a plurality of holes through which gas can pass on the side surface. In particular, the introduction gas dispersion means 7B is preferably composed of a mesh-like or porous member having a large number of holes through which gas can pass. The inner diameter of the introduction gas dispersion means 7B is preferably substantially the same as the minimum inner diameter of the swirling liquid flow acceleration unit 4. The gas that has flowed into the gas-liquid mixing unit 5B from the gas introduction unit 6B can swivel between the inner peripheral surface of the gas-liquid mixing unit 5B and the outer peripheral surface of the introduction gas dispersion means 7B.

  Next, operation | movement of the gas-liquid mixing apparatus 1B of this Embodiment 2 is demonstrated. When the swirl liquid flow accelerated by the swirl liquid flow acceleration unit 4 flows into the gas-liquid mixing unit 5B, a negative pressure is generated in the gas-liquid mixing unit 5B, and the gas is introduced from the gas introduction unit 6B by this negative pressure. Naturally sucked into the gas-liquid mixing unit 5B. In the gas-liquid mixing unit 5B, the accelerated swirling liquid flow and the gas introduced from the gas introduction unit 6B merge (unify) to generate fine bubbles. As shown in FIG. 6, the gas that has flowed into the gas-liquid mixing unit 5B swirls in the same direction as the swirling liquid flow along the inner peripheral surface of the gas-liquid mixing unit 5B. Thus, the gas swirling along the inner peripheral surface of the gas-liquid mixing unit 5B and the swirling liquid flow flowing into the gas-liquid mixing unit 5B come into contact with each other, whereby the gas is sheared and pulverized. The

  The diameter of the swirl liquid flow immediately after flowing into the gas-liquid mixing unit 5B from the swirl liquid flow acceleration unit 4 is substantially equal to the minimum inner diameter of the swirl liquid flow acceleration unit 4. On the other hand, the inner diameter of the gas-liquid mixing unit 5B is larger than the minimum inner diameter of the swirling liquid flow acceleration unit 4. Thereby, in the gas-liquid mixing part 5B, the ring-shaped (annular) space which functions as a flow path of the gas introduced from the gas introduction part 6B can be secured outside the swirling liquid flow. With such a configuration, the intake air can be increased without disturbing the flow of the swirling liquid flow, so that the intake air amount can be increased. Further, since the gas introduced from the gas introduction part 6B is sucked so as to swirl around the outer periphery of the swirling liquid flow, the contact area between the swirling liquid flow and the introduced gas can be increased. As a result, the amount of gas that is sheared by the swirling liquid flow increases, and the amount of fine bubbles generated also increases.

  Further, the stepped portion at the boundary between the downstream end 4a of the swirling liquid flow accelerating unit 4 and the upstream end 5a of the gas-liquid mixing unit 5B is closed by the ring-shaped wall surface 2, and the gas from the gas introducing unit 6B By adopting a structure in which only the inflow part is opened, turbulent flow formation in the gas-liquid mixing part 5B and the gas introduction part 6B can be suppressed. As a result, the negative pressure formed in the vicinity of the minimum inner diameter portion of the swirling fluid flow acceleration unit 4 can be formed even in the gas introduction unit 6B without loss.

  The negative pressure formed in the gas-liquid mixing unit 5B is the largest at the upstream end of the gas-liquid mixing unit 5B, and the negative pressure decreases as it goes downstream. In the present embodiment, the gas introduction part 6B of the gas introduction part 6B is configured to communicate with the vicinity of the upstream end of the gas-liquid mixing part 5B. Thereby, since intake can be performed at a position where the negative pressure is large, the intake amount can be increased, and the gas dissolution amount and the fine bubble generation amount can also be increased. Further, in the present embodiment, as shown in FIG. 5, the opening formed by the gas introduction part 6B on the inner wall of the gas-liquid mixing part 5B is formed in contact with the ring-shaped wall surface 2, and the ring-shaped wall surface 2 and The inner wall of the gas introduction part 6B is continuous without a step. Thereby, the amount of intake air can be further increased, and the amount of dissolved gas and the amount of generated fine bubbles can be further increased.

  The gas introduced from the gas introduction part 6B into the gas-liquid mixing part 5B joins (joins) the swirl liquid flow through a plurality of holes on the side surface of the introduction gas dispersion means 7B. When the flow rate of the liquid flow flowing into the gas-liquid mixing device 1B is large or when the pressure downstream of the gas-liquid mixing device 1B is low, the amount of gas flowing in from the gas introduction unit 6B increases. Even when the amount of introduced gas is increased, the introduced gas is dispersed through the plurality of holes on the side surface of the introduction gas dispersion means 7B when it joins the swirling liquid flow. ) Becomes substantially constant, and the bubbles are further sheared by the swirling liquid flow. For this reason, the diameter of the fine bubbles generated by being sheared by the swirling liquid flow can be maintained substantially constant, and the generation of a mixture of fine bubbles having a large diameter (for example, a bubble diameter of 100 μm or more) is reliably suppressed. be able to. Further, in the second embodiment, since the introduction gas dispersion means 7B is configured by a mesh-like or porous member, the introduced gas is finely passed through many holes on the side surface of the introduction gas dispersion means 7B. Can be dispersed. Thereby, the production | generation of a microbubble with a large diameter can be suppressed more reliably.

  In general, the larger the opening formed in the inner wall of the gas-liquid mixing unit 5B by the gas introduction unit 6B, the larger the intake amount. However, since the negative pressure decreases toward the downstream side in the gas-liquid mixing unit 5B, the length of the opening formed in the inner wall of the gas-liquid mixing unit 5B by the gas introduction unit 6B measured along the traveling direction TD ( It is not preferable to increase the length (indicated by β in FIG. 5) and widen the opening toward the downstream side because the negative pressure acting on the gas introducing portion 6B is reduced. In particular, when the pressure loss in the flow path on the downstream side of the gas-liquid mixing device 1B is large, the rate at which the negative pressure decreases toward the downstream side in the gas-liquid mixing unit 5B increases. It is not preferable to widen the opening formed in the inner wall of the gas-liquid mixing part 5B to the downstream side. In view of such matters, in the second embodiment, the length β of the size of the opening formed in the inner wall of the gas-liquid mixing unit 5B by the gas introduction unit 6B measured along the traveling direction TD is the opening β. Is preferably shorter than the length of the arc measured along a circle having a diameter equal to the inner diameter of the gas-liquid mixing part 5B. With such a configuration, the opening area can be increased without widening the opening formed in the inner wall of the gas-liquid mixing section 5B by the gas introduction part 6B, so that the intake air amount can be increased and the gas dissolution can be increased. The amount and the amount of fine bubbles generated can also be increased.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIGS. 7 and 8. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be denoted by the same reference numerals. The description is omitted. FIG. 7 is a longitudinal sectional view showing a gas-liquid mixing apparatus according to Embodiment 3 of the present invention. 8 is a cross-sectional view (transverse cross-sectional view) taken along the line YY in FIG.

  As shown in FIG. 7, the gas-liquid mixing device 1C of the third embodiment includes a swirling liquid flow generating unit 3, a swirling liquid flow accelerating unit 4, a gas-liquid mixing unit 5C, a gas introducing unit 6C, and an introduction. A gas dispersing means 7C and an enlarged diameter portion 9 are provided.

  The gas-liquid mixing unit 5 </ b> C is provided concentrically with the swirl liquid flow acceleration unit 4 on the downstream side of the swirl liquid flow acceleration unit 4. The inner diameter of the gas-liquid mixing unit 5C is larger than the minimum inner diameter of the swirling liquid flow acceleration unit 4. In the present embodiment, the inner diameter of the gas-liquid mixing unit 5C is substantially constant along the traveling direction TD. That is, the gas-liquid mixing unit 5C has a substantially cylindrical internal space.

  Further, the gas-liquid mixing device 1C has a gas-liquid mixing unit that extends from the downstream end 4a of the inner peripheral surface of the swirling liquid flow acceleration unit 4 (that is, the inner periphery of the minimum inner diameter portion of the swirling liquid flow acceleration unit 4) to the outer peripheral side. A ring-shaped wall surface 2 is formed as an inner wall surface connected to the upstream end 5a of the inner peripheral surface of 5C. In the illustrated configuration, the ring-shaped wall surface 2 forms an annular plane perpendicular to the traveling direction TD.

  As shown in FIG. 8, the gas introduction part 6C is configured to cause gas to flow into the gas-liquid mixing part 5C along the tangential direction of the inner peripheral surface of the gas-liquid mixing part 5C, as in the second embodiment. Has been. The gas introduction part 6C is configured to flow gas into the gas-liquid mixing part 5C along the tangential direction of the inner peripheral surface of the gas-liquid mixing part 5C, so that the gas-liquid mixing is performed through the gas introduction part 6C. The gas flowing into the part 5C can be efficiently swirled in a predetermined direction (in the present embodiment, counterclockwise in FIG. 6) along the inner peripheral surface of the gas-liquid mixing part 5C.

  As shown in FIG. 7, the introduction gas dispersion means 7C has a gas passage 7d and a plurality of holes 7b. The gas passage 7d is a cylindrical or annular passage that swirls the gas flowing into the gas-liquid mixing unit 5C along the ring-shaped wall surface 2. The plurality of holes 7b are holes that penetrate the wall surface of the gas passage 7d that faces the ring-shaped wall surface 2. As shown in FIG. 8, in the present embodiment, the four holes 7b are arranged so that the angles with respect to the center of the gas-liquid mixing unit 5C are equally spaced (90 ° intervals).

  Next, operation | movement of 1 C of gas-liquid mixing apparatuses of this Embodiment 3 is demonstrated. When the swirling liquid flow accelerated by the swirling liquid flow accelerating unit 4 flows into the gas-liquid mixing unit 5C, a negative pressure is generated in the gas-liquid mixing unit 5C, and the gas is introduced from the gas introduction unit 6C by this negative pressure. Naturally sucked into the gas-liquid mixing unit 5C. In the gas-liquid mixing unit 5C, the accelerated swirling liquid flow and the gas introduced from the gas introduction unit 6C join (unify) to generate fine bubbles. As shown in FIG. 8, the gas flowing into the gas-liquid mixing section 5C swirls in the gas passage 7d of the introduction gas dispersion means 7C in the same direction as the swirling liquid flow, and continues to swirl while leaving the hole 7b. It joins the flow and is sheared and crushed into fine bubbles.

  When the flow rate of the liquid flow flowing into the gas-liquid mixing device 1C is large or when the pressure downstream of the gas-liquid mixing device 1C is low, the amount of gas flowing in from the gas introduction unit 6C increases. Even when the amount of introduced gas increases as described above, the introduced gas is dispersed through the plurality of holes 7b of the introduction gas dispersion means 7C when joining the swirling liquid flow. And the bubbles are further sheared by the swirling liquid flow. For this reason, the diameter of the fine bubbles generated by being sheared by the swirling liquid flow can be maintained substantially constant, and the generation of a mixture of fine bubbles having a large diameter (for example, a bubble diameter of 100 μm or more) is reliably suppressed. be able to. Further, according to the third embodiment, since the gas can flow from the hole 7b in the same direction as the liquid flow traveling direction TD, the amount of sucked gas can be increased and the number of fine bubbles to be generated can be increased. .

  Any of the gas-liquid mixing apparatuses according to the first to third embodiments described above can be suitably used as a microbubble generator by using gas as air and liquid as water. Moreover, the gas-liquid mixing apparatus of the present invention can be preferably used as, for example, a parts washing apparatus in a factory manufacturing process, a dissolved oxygen enrichment apparatus for the purpose of bioactivation, and the like.

Embodiment 4 FIG.
Next, the fourth embodiment of the present invention will be described with reference to FIG. 9. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted. FIG. 9 is a block diagram showing an embodiment of the bath water heater of the present invention.

  As shown in FIG. 9, 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 includes a compressor 11 that compresses a refrigerant, a heating heat exchanger 12 that corresponds to a radiator, an expansion valve 13, an evaporator 14, and a circulation pipe 15 that connects these in an annular shape. The refrigeration cycle unit 17 is provided. In the refrigeration cycle unit 17, a refrigerant such as carbon dioxide is compressed by the compressor 11 to become a high temperature and a high pressure and then radiated by the boiling heat exchanger 12, depressurized by the expansion valve 13, and absorbed by the evaporator 14. The gas is then drawn into the compressor 11. When carbon dioxide is used as the refrigerant, it is preferable to operate on the high pressure side under conditions that exceed the critical pressure of carbon dioxide.

  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.

  Although not shown, a temperature sensor for detecting the temperature of hot water flowing from the hot water storage tank 20 into the tank side circulation pipe 50 and the first hot water supply pipe 75 is attached to the upper part of the hot water storage tank 20. Yes. A plurality of temperature sensors for detecting the temperature of the hot water in the hot water storage tank 20 are attached to the peripheral surface portion of the hot water storage tank 20 with different mounting heights.

  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. Although not shown, the second water supply pipe portion 30b is provided with a temperature sensor for detecting the temperature of the water in the second water supply pipe portion 30b.

  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 line that reaches the hot water inlet 20c at the upper part of the hot water storage tank 20 from the water outlet 20b at the lower part of the hot water storage tank 20 via the heat exchanger 12 for heating 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 12, the return pipe 40b connects the boiling heat exchanger 12 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 line 60 (bath circulation line) is a line that returns from the bathtub 170 to the bathtub 170 via the reheating heat exchanger 70, and includes a forward 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 53, a water level sensor 55, 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. Although not shown, the forward pipe 60a is also provided with a temperature sensor for detecting the temperature of hot water in the forward pipe 60a.

  The flow switch 53 detects the presence or absence of water flow in the forward pipe 60a. The water level sensor 55 detects the water level of the bath water in the bathtub 170 from the water pressure in the forward pipe 60a based on the mounting position of the water level sensor 55. 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. The temperature sensor (not shown) detects the temperature of the bath water in the forward pipe 60a. 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, a first microbubble generator 1D to which the gas-liquid mixing device of the present invention is applied is arranged. As the configuration of the first fine bubble generating device 1D, for example, the gas-liquid mixing device according to any one of the first to third embodiments described above can be applied. A solenoid valve 61 that can be opened and closed is provided in an intake section that communicates with a gas introduction section provided in the first microbubble generator 1D.

  Near the downstream end of the forward pipe 60a (between the bath water inlet 70c of the reheating heat exchanger 70 and the flow switch 53), a second fine bubble generating device 54 is disposed. An electromagnetic valve 56 that can be opened and closed is provided in the intake portion of the second microbubble generator 54. In the middle of the second hot water supply pipe line 90 connecting the bath-side hot / cold water mixing valve 80a and the forward pipe 60a, a third fine bubble generating device 58 is arranged. An electromagnetic valve 59 that can be opened and closed is provided in the intake portion of the third microbubble generator 58. The second microbubble generator 54 and the third microbubble generator 58 may not be configured by the gas-liquid mixing device of the present invention, but are configured by a naturally aspirated microbubble generator.

  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 of the first microbubble generator 1D, air is mixed in the bath water in the first microbubble generator 1D to generate a large amount of microbubbles in the bathtub 170. Can be supplied. By continuously driving the bath-side water supply pump 57, it is possible to continuously generate fine bubbles in the first fine bubble generating apparatus 1D, and thus the concentration of fine bubbles in the bathtub 170 can be increased. it can. At this time, only the bath-side water pump 57 is driven without driving the tank-side water pump 45, and only the operation for supplying the fine bubbles from the first micro-bubble generating device 1D into the bathtub 170 without the follow-up operation. May be performed.

  Moreover, when draining the bath water in the bathtub 170 after bathing, the bath water heater 150 opens the electromagnetic valve 56 of the second microbubble generator 54 and drives the bath-side water supply pump 57 to thereby The microbubbles generated by the microbubble generator 54 are supplied into the tracking heat exchanger 70 and the return pipe 60b, and have a function of cleaning and removing sebum dirt inside these.

  Moreover, when draining the bath water in the bathtub 170 after bathing, the bath water heater 150 opens the electromagnetic valve 59 of the third microbubble generator 58 while pouring water from the second hot water supply pipe 90, thereby providing the third The fine bubbles generated by the fine bubble generator 58 are supplied into the forward pipe 60a and have a function of cleaning and removing sebum dirt inside.

1A, 1B, 1C gas-liquid mixing device, 1D fine bubble generator, 2 ring-shaped wall surface, 3 swirling liquid flow generating unit, 4 swirling liquid flow accelerating unit, 4a downstream end, 5A, 5B, 5C gas-liquid mixing unit, 5a upstream end, 6A, 6B, 6C gas introduction part, 6a gas passage, 6b inner wall, 7A, 7B, 7C introduction gas dispersion means, 7a, 7b hole, 7d gas passage, 8 fixed wing, 9 enlarged diameter part, 10 gap , 11 Compressor, 12 Heat exchanger for boiling, 13 Expansion valve, 14 Evaporator, 15 Circulation piping, 17 Refrigeration cycle section, 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 pipe, 30a first water supply pipe, 30b second water supply pipe, 30c third water supply pipe, 33 hot water storage water pump, 35 three-way valve, 40 hot water circulation pipe 40a forward pipe, 40b return pipe, 40c bypass pipe, 45 tank side water supply pump, 50 tank side circulation pipe, 50a forward pipe, 50b return pipe, 53 flow switch, 54 second fine bubble generator, 55 water level sensor, 56 Solenoid valve, 57 Bath side water pump, 58 Third fine bubble generator, 59 Solenoid valve, 60 Bath side circulation pipe, 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, 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 3rd hot water supply pipe, 100 control unit, 101 remote control device, 110 heat pump unit, 120 tank unit, 150 bath hot water supply device, 1 5 tub adapter, 170 bathtubs, 180 generally hot water destination

Claims (7)

A swirl liquid flow generating unit that generates a swirl liquid flow in the liquid flow path;
A swirl liquid flow acceleration unit for reducing the swirl diameter of the swirl liquid flow;
A gas introduction part for taking in gas from the outside;
A gas-liquid mixing unit that generates fine bubbles by joining the swirling liquid flow and the gas taken in from the gas introduction unit;
Introduction gas dispersion means for dispersing the gas that joins the swirling liquid flow;
A gas-liquid mixing device.   The gas-liquid mixing device according to claim 1, wherein the introduction gas dispersion means is configured by a mesh-like or porous member through which gas can pass.   The gas-liquid mixing device according to claim 1 or 2, wherein the introduction gas dispersion means is provided in the vicinity of an outlet of the gas introduction portion. The gas-liquid mixing part has an inner diameter larger than the minimum inner diameter of the swirling liquid flow acceleration part,
A ring-shaped wall surface extending from the downstream end of the inner peripheral surface of the swirling liquid flow accelerating portion to the outer peripheral side and connected to the upstream end of the inner peripheral surface of the gas-liquid mixing portion is formed,
The gas-liquid mixing device according to claim 1, wherein the gas introduction unit causes a gas to flow into the gas-liquid mixing unit along a tangential direction of an inner peripheral surface of the gas-liquid mixing unit. The introduction gas dispersion means is arranged in the gas-liquid mixing part, and is composed of a cylindrical member having a plurality of holes on the side surface through which gas can pass.
The gas-liquid mixing device according to claim 4, wherein the gas flowing into the gas-liquid mixing unit from the gas introduction unit can swivel between an inner peripheral surface of the gas-liquid mixing unit and an outer peripheral surface of the cylindrical member. . The gas dispersion means includes
A gas passage that swirls the gas flowing into the gas-liquid mixing section along the ring-shaped wall;
A plurality of holes formed in a partition wall facing the ring-shaped wall surface of the gas passage, through which gas can pass;
The gas-liquid mixing apparatus of Claim 4 which has these. A bath circuit that circulates hot water derived from the bath and returns it to the bath,
A circulation pump for circulating hot water in the bath circulation path;
The gas-liquid mixing device according to any one of claims 1 to 6, provided in the middle of the bath circulation path,
A bath water heater equipped with.

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