JP5776801B2 - Fixed swirler, bubble generating device and bath water heater using the fixed swirler - Google Patents

Description

  The present invention relates to a fixed swirler that generates a swirling flow in a fluid, a bubble generator using the fixed swirler, and a bath water heater.

  As described in Patent Document 1, for example, as described in Patent Document 1, by using a fixed swirl blade, an organic waste liquid is swirled to decompose organic matter, or water is swirled to crush air to break up air bubbles. There is known a bubble generating device for generating a gas. Here, a venturi type, a cavitation type, a pressure dissolution type, a swirling type, etc. are known as means for uniformly mixing a gas in a liquid or generating fine bubbles. The Venturi type uses a phenomenon in which a constriction (throttle) is provided in the flow path of the liquid, and a negative pressure is formed by increasing the flow velocity in the constriction. generate. In the cavitation type, for example, a gas-liquid mixture is fed into a pump and ultrasonic vibration is applied to generate bubbles using cavitation.

  In addition, the pressure dissolution type uses a phenomenon in which air pressurized by a compressor or the like is dissolved in a liquid, and bubbles reprecipitate when the liquid is released under reduced pressure. However, it is possible to dissolve a large amount of gas. In the swirling flow type, a swirling flow of liquid is formed, and the swirling flow is united with the gas, whereby the gas is sheared using the swirling flow to generate fine bubbles. As an example of the 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 generated by swirling flow are known.

  In the bubble generating device, the organic matter decomposing device, the water purification device, and the like, it is important to generate fine and large amount of bubbles in order to improve the function as the device. In this case, in an apparatus with a relatively small liquid flow rate, a swirling flow type is often used in order to generate fine and a large amount of bubbles. In the swirling flow method, a water flow is introduced from a tangential direction on the diameter expansion side to the conical channel wall surface and the water flow is swung along the channel wall surface by a fixed blade and a conical surface method. A swirl blade system that swirls to form a swirl flow is known. When these methods are compared, the swirl vane method can generate fine and large amount of bubbles in a state where pressure loss is suppressed.

Japanese Patent No. 4019154

  In the prior art described above, there is a demand to increase the swirl force of swirl flow generated by the swirl vane system as much as possible. As means for improving the turning force, a method of increasing the size and number of blades is known. However, when the size of the wing is increased, the gap (fluid flow path) between the wings becomes relatively narrow, so that there is a problem that foreign matters such as hair are easily clogged in the gap. In addition, if the number of blades is reduced to reduce the clogging of foreign objects and the gap between the blades is enlarged, the water flow that passes through this gap (that is, the water flow that passes through the gap without receiving the turning force from the blade) increases. Therefore, there is a problem that the turning force of the water flow is reduced.

  The present invention has been made to solve the above-described problems, and uses a fixed swirl blade capable of improving the swirl force of a water flow while suppressing clogging of foreign matter, and the fixed swirl blade. An object of the present invention is to provide a bubble generator and a bath water heater.

A fixed swirl according to the present invention includes a cylindrical pipe that forms at least a part of a pipe passage through which fluid flows in an axial direction, and a member that protrudes radially inward on the inner peripheral side of the cylindrical pipe. An inclined surface that extends in the axial direction from the upstream side to the downstream side of the pipe and is inclined in a substantially spiral shape along the circumferential direction, and an uppermost stream end portion that is located on the most upstream side among the inclined surfaces , A plurality of swirl flow generating blades arranged at intervals in the circumferential direction of the cylindrical tube, and a turbulent projecting radially inward from the inner wall surface of the cylindrical tube at an axial position corresponding to the most upstream end of the swirl flow generating blade A turbulent flow generation step is formed by an annular step provided on the inner wall surface of the cylindrical tube, and the turbulence generation step is in the axial direction of the cylindrical tube. At the same position as the uppermost stream end of the swirl flow generator blade or upstream of the uppermost stream end The axial distance between the step portion and the most upstream end is disposed becomes smaller position than the axial dimension of the swirling flow generating vanes, as viewed in the axial direction of the cylindrical tube, the projected area of the whirling flow generating vanes, the cylindrical tube It is set as the structure formed below the projection area of the clearance gap formed between the swirl | vortex flow generation | occurrence | production blades in the inner peripheral side.

  According to the present invention, the turbulent flow generation step portion can generate turbulent flow upstream of the swirl flow generating blade over the entire circumference of the cylindrical tube. By this turbulent flow, the water flow induced to the position of the swirl flow generating blade can be increased, and the water flow passing through the side of the blade without contacting the swirl flow generating blade can be relatively decreased. That is, since the water flow that does not contribute to the swirl flow can be reduced, the ability of the swirl flow to be generated by the fixed swirl blade can be improved. Thereby, for example, even if a small number of swirl flow generating blades are arranged in the cylindrical tube, the swirl flow can be sufficiently generated, and the opening area of the gap channel formed at a position other than the swirl flow generating blades in the cylindrical tube Can be set large. Therefore, it is possible to secure the swirl force of the water flow while suppressing the clogging of the foreign matter in the gap flow path, and to stably operate the fixed swirl vane.

It is sectional drawing which shows typically the bubble generator by Embodiment 1 of this invention. It is a perspective view which shows the swirl | wing structure of the fixed swirl | wing blade shown in FIG. It is sectional drawing which shows the state which fractured | ruptured the fixed swirl | wing blade along the central axis. It is the front view which looked at the fixed swirl blade from the upstream side. It is explanatory drawing which shows the example of a setting of the positional relationship of a swirl flow generation blade and a turbulent flow generation step part. FIG. 6 is a characteristic diagram showing the intake air amount of the bubble generating device realized by each setting example in FIG. 5. It is sectional drawing which shows the fixed swirl | wing blade by Embodiment 2 of this invention. It is a perspective view which shows the swirl | wing structure of the fixed swirl | wing blade by Embodiment 3 of this invention alone. It is the front view which looked at the swirl | wing structure in FIG. 8 from the upstream. It is a perspective view which shows the swirl | wing structure of the fixed swirl | wing blade by Embodiment 4 of this invention alone. It is a block diagram which shows the hot water storage type water heater by Embodiment 5 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. In each drawing used in this specification, common elements are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a cross-sectional view schematically showing a bubble generator according to Embodiment 1 of the present invention. As shown in this figure, the bubble generating device 1 is installed in a pipe passage P through which water (fluid) flows, and includes a fixed swirl blade 10, a reduced diameter portion 2, an air introducing portion 3, and a bubble generating portion 4. It has. The fixed swirl vane 10 generates a swirl flow in the water flowing in the pipe passage P, and the configuration thereof will be described later.

  The reduced diameter portion 2 reduces the radius of the swirl flow generated by the fixed swirl vane 10 to speed up the swirl flow, and is coaxially connected to the downstream side of the fixed swirl vane 10 (cylindrical tube 11). The diameter of the connection portion is reduced to a substantially conical shape. The air introduction portion 3 is a passage for introducing air from the radially outer side to the downstream side (the most reduced diameter portion) of the reduced diameter portion 2, and is provided on the downstream side of the reduced diameter portion 2. The bubble generating part 4 is formed of, for example, a cylindrical tube whose inflow side has a diameter reduced to a substantially conical shape, and is connected coaxially to the downstream side of the reduced diameter part 2. The bubble generation unit 4 generates fine bubbles in water using the swirl flow generated by the fixed swirl blade 10 and the air introduced from the air introduction unit 3.

  Next, the basic operation of the bubble generator 1 will be described. First, when water flowing in the axial direction in the pipe passage P flows into the cylindrical tube 11 of the fixed swirl vane 10, a swirl flow is generated in the water flow by the action of the fixed swirl vane 10. The swirling flow that has flowed out of the cylindrical tube 11 passes through the reduced diameter portion 2 and the swirling radius is reduced, while the flow velocity in the swirling direction is increased. As a result, a pressure difference (negative pressure) is generated between the reduced diameter portion 2 and the air introduction portion 3, so that air is sucked into the downstream side of the reduced diameter portion 2 from the air introduction portion 3 due to the pressure difference. . The sucked air is sheared by the swirling flow at a position where the swirling flow is united, and fine bubbles are generated in the bubble generating unit 4.

  Next, the configuration of the fixed swirl blade 10 will be described with reference to FIGS. 2 to 4. FIG. 2 is a perspective view showing the swirler structure of the fixed swirler shown in FIG. 1 alone. FIG. 3 is a cross-sectional view (longitudinal sectional view) showing a state in which the fixed swirl blade is broken along the central axis, and FIG. 4 is a front view of the fixed swirl blade as viewed from the upstream side. As shown in these drawings, the fixed swirl blade 10 is provided on the inner peripheral side of the cylindrical tube 11 and a cylindrical tube 11 that is coaxially connected in the middle of the piping passage P and forms at least a part of the piping passage P. The swirl wing structure 12 is provided. As shown in FIG. 3, the cylindrical tube 11 is formed in a cylindrical shape with both axial sides open, and has an inner wall surface 11 </ b> A. One end side (upstream side) of the cylindrical tube 11 in the axial direction is a fluid inflow end, and the other end side (downstream side) in the axial direction is a fluid outflow end.

  The swirl vane structure 12 includes an inner cylinder 13, a swirl flow generating blade 14, and a turbulent flow generation step 15. The inner cylinder 13 is a member for fixing the swirl flow generating blade 14 on the inner peripheral side of the cylindrical tube 11 and forming the turbulent flow generation step portion 15. The inner cylinder 13 is formed in a cylindrical shape having a smaller diameter than the cylindrical tube 11, and is fitted coaxially to the inner peripheral side of the cylindrical tube 11 in a state where rotation is restricted. The swirl flow generating blade 14 generates a swirl flow by applying a swirl force to the water flowing in the axial direction in the cylindrical tube 11, and the cross section thereof is curved in a substantially arc shape as shown in FIGS. It is formed by the plate | board material which protruded, and protrudes in the radial direction inward from 13 A of inner wall surfaces of the inner side cylinder 13. As shown in FIG.

  Further, the swirl flow generating blade 14 has an inclined surface 14A that extends in the axial direction from the upstream side to the downstream side of the cylindrical tube 11 (inner cylindrical body 13) and is inclined in a substantially spiral shape along the circumferential direction, It has the most upstream end part 14B located in the most upstream side among the inclined surfaces 14A. As shown in FIG. 3, the cross-sectional shape of the swirl flow generating blade 14 is such that the upstream portion close to the most upstream end portion 14B extends along the direction of water flow (the axial direction of the cylindrical tube 11). It curves so that it may stand up in the direction perpendicular to the water flow as it moves away from the upstream end portion 14B.

  On the other hand, as shown in FIG. 4, for example, two swirl flow generating blades 14 are arranged at an interval of 90 ° in the circumferential direction of the cylindrical tube 11. It has a central angle of about 90 ° when viewed from the axial direction. As a result, a substantially fan-shaped gap channel (inter-blade channel) 16 having a central angle of about 90 ° when viewed from the axial direction of the cylindrical tube 11 is formed between the swirl flow generating blades 14. In the present embodiment, the case where two swirl flow generating blades 14 are used has been exemplified. However, the present invention is not limited to this, and one swirl flow generating blade or 3 on the inner peripheral side of the inner cylindrical body 13. It is good also as a structure which protrudes the swirl | vortex flow generating blade more than a sheet. In the present invention, the central angle of the swirl flow generating blade 14 and the inter-blade channel 16 is not limited to 90 °, but may be set to any appropriate angle. Furthermore, the inner cylindrical body 13, the swirl flow generating blade 14 and the turbulent flow generating step portion 15 may be integrally formed of a resin material or the like.

  As shown in FIG. 3, the turbulent flow generation step portion 15 generates turbulent flow upstream of the swirl flow generating blade 14, and protrudes radially inward from the inner wall surface 11 </ b> A of the cylindrical tube 11. In the present embodiment, the case where the turbulent flow generation step 15 is configured by the axial end face of the inner cylinder 13 is illustrated, and the turbulence generation step 15 is annular over the entire circumference of the cylindrical tube 11. It extends to. Further, the turbulent flow generation step portion 15 has an axial position in the cylindrical tube 11 that is equal to the most upstream end portion 14B of the swirling flow generating blade 14 or upstream of the most upstream end portion 14B. Is arranged. 1 and 3 exemplify a case where the turbulent flow generation step portion 15 is arranged on the upstream side of the most upstream end portion 14B.

  Next, the operation of the fixed swirl blade 10 according to the present embodiment will be described. First, the water flowing into the cylindrical tube 11 is basically guided in the circumferential direction by the inner wall surface 13A of the inner cylinder 13 and the inclined surface 14A of the swirling flow generating blade 14 to become a swirling flow. This swirling flow flows out downstream of the swirling flow generating blade 14 through the inter-blade channel 16. At this time, the water flow flowing in the vicinity of the inner wall surface 11 </ b> A of the cylindrical tube 11 collides with the turbulent flow generation step portion 15 and generates a turbulent flow upstream of the swirl flow generating blade 14 as shown in FIG. 3. This turbulent flow causes turbulence in the flow of water flowing near the uppermost stream end 14B of the swirl flow generating blade 14 or the flow of water flowing from the upstream side of the swirl flow generating blade 14 toward the inter-blade channel 16.

  As a result, of the water flow flowing inside the cylindrical tube 11, the water flow that is brought into contact with the uppermost stream end 14 </ b> B of the swirl flow generating blade 14 and guided to the inclined surface 14 </ b> A increases and does not contact the swirl flow generating blade 14. The water flow passing through the inter-blade channel 16 tends to decrease relatively. That is, according to the turbulent flow generation step portion 15, the water flow that does not contribute to the swirl flow through the inter-blade channel 16 in the axial direction can be reduced, so that the swirl flow generation blade 14 can improve the swirl flow generation capability. And the swirl force of the water flow can be increased. Thereby, for example, even if only two swirling flow generating blades 14 having a central angle of about 90 ° are arranged, a swirling flow can be sufficiently generated, and the opening area (center angle) of the inter-blade channel 16 is increased. Can be set.

  Therefore, according to the present embodiment, even in an environment where foreign matter exists in the water, the turning force of the water flow can be secured while suppressing the foreign matter from clogging the inter-blade channel 16, and the fixed swirl blade 10. Can be operated stably. As a result, fine bubbles can be stably generated using the swirling flow, and the performance and reliability of the bubble generator 1 can be improved.

  Next, the positional relationship between the swirl flow generating blade 14 and the turbulent flow generation step 15 will be described with reference to FIGS. 5 and 6. FIG. 5 is an explanatory diagram showing a setting example of the positional relationship between the swirl flow generating blade and the turbulent flow generation step. FIG. 6 is a characteristic diagram showing the intake air amount of the bubble generating device realized by each setting example in FIG. 5 and 6 exemplify a case where the blade length of the swirl flow generating blade 14 (the dimension of the swirl flow generating blade 14 in the axial direction of the cylindrical tube 11) is set to 6 mm. The axial distance L illustrated in FIG. 5 is defined as the distance between the downstream end of the swirl flow generating blade 14 and the turbulent flow generation step 15 in the axial direction of the cylindrical tube 11. Further, in FIG. 6, the intake amount (mL / min) of the bubble generating device 1 indicates the flow rate of air sucked from the air introduction unit 3 when the bubble generating device 1 is operated.

  As shown in FIG. 6, the intake amount of the bubble generating device 1 becomes maximum when the axial distance L is equal to the blade length, and tends to decrease as the axial distance L increases. This tendency means that when the axial distance L is increased, the turbulent flow generated in the turbulent flow generation step portion 15 is rectified before reaching the swirl flow generating blade 14 and the effect of the turbulent flow is reduced. . Further, when the axial distance L is smaller than the blade length, that is, when the turbulent flow generation step portion 15 is arranged downstream of the most upstream end portion 14B of the swirl flow generation blade 14, turbulent flow is generated. The turbulent flow generated in the step portion 15 does not sufficiently act on the most upstream end portion 14B (inclined surface 14A).

  Therefore, the turbulent flow generation stage 15 is optimally disposed at the same axial position as the most upstream end 14B, as indicated by the solid line in FIG. Further, when optimal arrangement is difficult due to structural constraints, at least the turbulent flow generation step portion 15 is arranged upstream of the most upstream end portion 14B, and the axial distance L is made as small as possible. It is preferable to set. According to the above arrangement, the turbulent flow generated in the turbulent flow generation step portion 15 can be effectively applied to the water flow near the uppermost stream end portion 14B, and the function of the turbulent flow generation step portion 15 is maximized. Can be made.

  Further, according to the present embodiment, the swirl flow generating blades 14 are provided on the inner peripheral side of the inner cylinder 13, and the turbulent flow generation step portion 15 is configured by the end surface of the inner cylinder 13. Thereby, for example, the inner cylinder 13, the swirling flow generating blade 14 and the turbulent flow generating step portion 15 can be formed as a swirling blade structure 12 by a single component, and the structure of the fixed swirling blade 10 is simplified. Assembling can be improved. Moreover, by using the inner cylinder 13, the annular turbulent flow generation step 15 can be easily formed inside the cylindrical tube 11, and the workability of the step can be improved. In addition, by forming the turbulent flow generation step portion 15 in an annular shape, it is possible to stably generate turbulent flow over the entire circumference of the cylindrical tube 11 and maximize the effect of turbulent flow.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is characterized in that a turbulent flow generation step is provided on the inner wall surface of the cylindrical tube. FIG. 7 is a sectional view showing a fixed swirl vane according to Embodiment 2 of the present invention. As shown in this figure, in the fixed swirl vane 20 according to the present embodiment, the inner cylinder 13 is not used, and the swirl flow generating vane 14 ′ and the annular turbulent flow generating step portion are formed on the inner wall surface 11 A of the cylindrical tube 11. 21 is projected.

  Here, the swirl flow generating blade 14 'is configured in substantially the same manner as the swirl flow generating blade 14 of the first embodiment, and has an inclined surface 14A' and a most upstream end portion 14B '. However, the outer diameter dimension of the swirl flow generating blade 14 ′ is larger than that of the swirl flow generating blade 14 by an amount corresponding to the absence of the inner cylinder 13. Further, the turbulent flow generation step portion 21 protrudes radially inward from the inner wall surface 11 </ b> A over the entire circumference of the cylindrical tube 11.

  In the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as in the first embodiment. Further, the outer diameter dimension of the swirl flow generating blade 14 can be increased by the amount not using the inner cylindrical body 13, and the swirl flow generation capability can be improved.

Embodiment 3 FIG.
Next, Embodiment 3 of the present invention will be described with reference to FIGS. This embodiment is characterized in that the turbulent flow generation step portion is formed in an arc shape. FIG. 8 is a perspective view showing a single swirl structure of a fixed swirl according to the third embodiment of the present invention. FIG. 9 is a front view of the swirler structure in FIG. 8 as viewed from the upstream side. As shown in these drawings, the fixed swirl vane 30 according to the present embodiment is an inner cylindrical body that is fitted to the inner peripheral side of the cylindrical tube 11 (see FIG. 3), as in the first embodiment. 31 is provided. The upstream part of the total length of the inner cylinder 31 is bent radially inward at two places in the circumferential direction, for example, and this part has two swirl flows protruding toward the inner circumference of the inner cylinder 31. A generating blade 32 is formed.

  The swirling flow generating blade 32 is configured in substantially the same manner as the swirling flow generating blade 14 of the first embodiment, and has an inclined surface 32A and a most upstream end portion 32B. Further, two portions located between the swirl flow generating blades 32 in the entire circumference of the inner cylindrical body 31 extend in the axial direction without being bent in the radial direction, and end faces of these portions are For example, two turbulent flow generation stages 33 are formed. The turbulent flow generation step portion 33 is formed as an arc-shaped projection extending along the inner wall surface 11A of the cylindrical tube 11, and is configured to protrude radially inward from the inner wall surface 11A. Further, each turbulent flow generation step portion 33 is disposed on the upstream side of the swirl flow generating blade 32 and at a position corresponding to each inter-blade channel 16 in the circumferential direction of the cylindrical tube 11.

  Also in the present embodiment configured as described above, the turbulent flow generated in the turbulent flow generation step 33 acts on the water flow that is about to pass through the inter-blade channel 16 without being in contact with the swirl flow generating blade 32. Therefore, substantially the same effect as in the first embodiment can be obtained.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that a recess is provided in the turbulent flow generation step. FIG. 10 is a perspective view showing a swirl structure for a fixed swirl according to a fourth embodiment of the present invention. As shown in this figure, in the fixed swirl blade 40 according to the present embodiment, for example, two dent portions 41 are provided in the turbulent flow generation step portion 15. The recess 41 is formed as, for example, a rectangular recess, and is recessed in the axial direction from the surface of the turbulent flow generation step 15 facing the upstream side of the cylindrical tube 11 toward the downstream side. Further, the recess 41 is located upstream of the inclined surface 14A of each swirl flow generating blade 14 (preferably, the position where the most upstream end portion 14B of each swirl flow generating blade 14 is connected to the inner wall surface 13A of the inner cylindrical body 13. ). In addition, in FIG. 10, the case where the hollow part 41 is formed in the position a little shifted from the most upstream end part 14B is illustrated.

  According to the hollow part 41, the following effects can be obtained. First, the water flow flowing through the peripheral edge of the cylindrical tube 11 is likely to flow into the recess 41 where the pressure loss is small compared to the position of the turbulent flow generation step portion 15. This water flow is guided from the hollow portion 41 to the inclined surface 14A (uppermost flow end portion 14B) of the swirl flow generating blade 14, and forms a swirl flow while flowing along the inclined surface 14A. Thus, since the hollow part 41 guides the surrounding water flow to the inclined surface 14A of the swirl flow generating blade 14, the water flow flowing along the inclined surface 14A can be increased. Therefore, in addition to the effects of the first embodiment, the ability to generate a swirling flow can be further improved.

  Further, the water flow guided from the depression 41 to the inclined surface 14A is given a larger turning force as the distance flowing along the inclined surface 14A is longer. For this reason, the formation position of the hollow portion 41 is a position where the uppermost flow end portion 14B of the swirling flow generating blade 14 overlaps with the uppermost flow end portion 14B as viewed from the axial direction (upstream side) of the cylindrical tube 11 It is optimal to set it at a position connected to the inner wall surface 13A. In addition, when optimal arrangement is difficult due to structural restrictions or the like, the depression 41 is formed at a position where the central angle formed by at least the most upstream end portion 14B and the depression 41 is within 45 °. Is preferred. Thereby, the induction | guidance | derivation effect of the water flow by the hollow part 41 can be exhibited to the maximum.

Embodiment 5 FIG.
Next, a fifth embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that the bubble generating device provided with the fixed swirl blade according to any one of the first to fourth embodiments is applied to a hot water storage type water heater as a bath water heater. FIG. 11 is a configuration diagram showing a hot water storage type hot water heater according to Embodiment 5 of the present invention. The hot water storage type hot water heater 50 according to the present embodiment includes a heat pump unit 51, a hot water storage tank 52, a boiling circuit 53, a circulation heat exchanger 55, a reheating circuit 56, a bathtub 58, a bath side circulation circuit 59, a bubble generation device 70, and the like. It has.

  The heat pump unit 51 includes, for example, a compressor, an air refrigerant heat exchanger, an expansion valve, a water refrigerant heat exchanger, a refrigerant circulation pipe, and the like, and constitutes a refrigerant cycle (heat pump cycle). The heat pump unit 51 and the hot water storage tank 52 are connected to each other via a boiling circuit 53 that circulates hot water between them, and the boiling circuit 53 includes a boiling circulation pump 54. The heat pump unit 51 heats the low-temperature water taken out from the lower part of the hot water storage tank 52 via the boiling circuit 53 to generate high-temperature water, and flows the high-temperature water into the upper part of the hot water storage tank 52 from the boiling circuit 53.

  The hot water storage tank 52 and the primary side of the circulation heat exchanger 55 are connected to each other via a reheating circuit 56 that circulates hot water between them, and the reheating circuit 56 includes a recirculation circulation pump 57. Yes. The secondary side of the circulation heat exchanger 55 and the bathtub 58 are connected to each other via a bath-side circulation circuit 59 that circulates hot water between them. The bath-side circulation circuit 59 is provided in the outgoing pipe 60 that causes the cooled bathtub water to flow out of the bathtub 58, the return pipe 61 that returns the bathtub water heated by the circulating heat exchanger 55 to the bathtub 58, and the outgoing pipe 60, for example. And a bath-side circulation pump 62.

  The bubble generator 70 has, for example, the same configuration as the bubble generator 1 shown in FIG. 1 and includes any of the fixed swirl blades 10, 20, 30, and 40 exemplified in the first to fourth embodiments. . And the bubble generator 70 is installed in the return pipe 61, as shown in FIG. The return pipe 61 is connected to the bubble generating device 70 by the same configuration as the piping passage P in FIG. The return pipe 61 is connected to a bathtub adapter 80 attached to the wall surface of the bathtub 58 on the downstream side of the bubble generating device 70.

  Next, the operation of the bubble generator 70 will be described. First, during the reheating operation of the water heater, the recirculation circulation pump 57 and the bath side circulation pump 62 are operated. Thereby, the high-temperature water stored in the hot water storage tank 52 circulates in the reheating circuit 56 while flowing through the primary side of the circulating heat exchanger 55. The bathtub water cooled in the bathtub 58 is introduced into the secondary side of the circulating heat exchanger 55 through the outgoing pipe 60 and heated by exchanging heat with the high-temperature water on the primary side, and then returned to the return pipe. 61 and the bubble generating device 70 are returned to the bathtub 58. When the bathtub water passes through the bubble generating device 70, fine bubbles are generated in the bathtub water by the bubble generating device 70, and the fine bubbles are released into the bathtub 58 together with the warmed bath water.

  According to the present embodiment configured as described above, the fine bubble can be stably discharged into the bathtub 58 by the bubble generating device 70. And the effect (warm bath effect) which suppresses that the heat | fever at the time of bathing dissipates from a body can be acquired because a micro bubble adheres to a human body. The bubble generating device 70 is mounted with any of the fixed swirl blades 10, 20, 30, and 40 described in the first to fourth embodiments. For this reason, the swirl flow can be sufficiently generated by the small number of swirl flow generating blades 14, and a large amount of fine bubbles can be efficiently discharged into the bathtub 58. Further, even when hair or the like that is likely to be mixed as foreign matter in the bath water reaches the fixed swirl blade, foreign matter such as hair can be smoothly discharged from the inter-blade channel 16 having a large opening area as described above. The hair can be prevented from clogging inside the fixed swirl wing.

  In the first to fourth embodiments, the case where the turbulent flow generation step portions 15, 21, 33 are formed in an annular shape, or formed in an arc shape with a central angle substantially equal to the inter-blade channel 16 is illustrated. . However, the present invention is not limited to this, and the turbulent flow generation step portion may be formed at least at a position overlapping the inter-blade channel 16 when viewed from the axial direction (upstream side) of the cylindrical tube 11. , 14 ′, 32, the presence / absence and size of the turbulent flow generation step portion may be freely set.

  Moreover, in the said Embodiment 1 thru | or 5, the case where the fixed swirl | wing blade 10,20,30,40 was applied to the bubble generator 1,70 and the hot water storage type hot water supply machine 50 was illustrated. However, the present invention is not limited to this. For example, the present invention can be applied to various devices that generate a swirling flow in a fluid without providing a bubble generating function. In the first to fifth embodiments, each configuration has been described individually. However, the present invention is not limited to the configuration of each embodiment, and a system realized by combining a plurality of possible configurations among the configurations illustrated in Embodiments 1 to 5 is also possible. Is included.

DESCRIPTION OF SYMBOLS 1,70 Bubble generator, 2 Reduced diameter part, 3 Air introduction part, 4 Bubble generation part, 10, 20, 30, 40 Fixed swirl blade, 11 Cylindrical tube, 11A, 13A Inner wall surface, 12 Swirler structure 13, 31 Inner cylinder, 14, 14 ', 32 Swirl flow generating blade, 14A, 14A', 32A Inclined surface, 14B, 14B ', 32B Most upstream end, 15, 21, 33 Turbulent flow generation step, 16 Flow path between blades, 41 recess, 50 hot water storage type water heater (bath hot water supply device), 51 heat pump unit, 52 hot water storage tank, 56 additional circuit, 58 bathtub, 59 bath side circulation circuit, 60 outgoing pipe, 61 return pipe, 62 Bath-side circulation pump, 80 Bathtub adapter,
P Piping passage

Claims (8)

A cylindrical pipe constituting at least a part of a pipe passage through which the fluid flows in the axial direction;
A member that protrudes radially inward on the inner peripheral side of the cylindrical tube, and extends in the axial direction from the upstream side to the downstream side of the cylindrical tube, and is inclined in a substantially spiral shape along the circumferential direction. A plurality of swirl flow generating blades having an inclined surface and a most upstream end located on the most upstream side of the inclined surface, and arranged at intervals in the circumferential direction of the cylindrical tube;
A turbulent flow generation step projecting radially inward from the inner wall surface of the cylindrical tube at an axial position corresponding to the most upstream end of the swirl flow generating blade,
The turbulent flow generation step portion is constituted by an annular step portion provided on the inner wall surface of the cylindrical tube over the entire circumference, and the turbulent flow generation step portion generates the swirl flow in the axial direction of the cylindrical tube. An axial distance between the turbulent flow generation step portion and the most upstream end that is equal to the most upstream end of the blade or upstream of the most upstream end is the axial direction of the swirl flow generating blade Placed at a position smaller than the dimensions of
The fixed area is configured such that the projected area of the swirl flow generating blades is smaller than the projected area of the gap formed between the swirl flow generating blades on the inner peripheral side of the cylindrical tube when viewed from the axial direction of the cylindrical tube. Type swirl. A cylindrical pipe constituting at least a part of a pipe passage through which the fluid flows in the axial direction;
A member that protrudes radially inward on the inner peripheral side of the cylindrical tube, and extends in the axial direction from the upstream side to the downstream side of the cylindrical tube, and is inclined in a substantially spiral shape along the circumferential direction. A plurality of swirl flow generating blades having an inclined surface and a most upstream end located on the most upstream side of the inclined surface, and arranged at intervals in the circumferential direction of the cylindrical tube;
A turbulent flow generation step projecting radially inward from the inner wall surface of the cylindrical tube at an axial position corresponding to the most upstream end of the swirl flow generating blade,
The turbulent flow generation step portions are arranged at positions corresponding to a plurality of gaps formed between the swirl flow generation blades and extend in the circumferential direction while having a circumferential interval therebetween, and the cylinder A plurality of arc-shaped stepped portions projecting radially inward from the inner wall surface of the tube, and the turbulent flow generating stepped portion is connected to the most upstream end of the swirl flow generating blade in the axial direction of the cylindrical tube. The same position or a position upstream of the most upstream end and the axial distance between the turbulent flow generation stage and the most upstream end is smaller than the axial dimension of the swirl flow generating blade Placed in
The fixed area is configured such that the projected area of the swirl flow generating blades is smaller than the projected area of the gap formed between the swirl flow generating blades on the inner peripheral side of the cylindrical tube when viewed from the axial direction of the cylindrical tube. Type swirl.   The turbulent flow generation step portion is provided on the upstream side of the inclined surface of the swirl flow generation blade, and is provided with a hollow portion that is recessed in the axial direction from the upstream side to the downstream side. Fixed swirl wing. 2. An inner cylindrical body in which an axial end surface constitutes the turbulent flow generation step portion and an inner cylindrical body in which the swirl flow generating blades protrude from the inner peripheral side is provided on the inner peripheral side of the cylindrical tube. The fixed swirl blade according to any one of 3 . Two swirl flow generating blades are arranged at intervals of 90 ° in the circumferential direction of the cylindrical tube, and each of the two swirl flow generating blades has a central angle of 90 ° when viewed from the axial direction of the cylindrical tube. The fixed swirl blade according to any one of claims 1 to 4 , wherein the fixed swirl blade is configured. The recess portion, as viewed in the axial direction of the cylindrical tube, in claim 3 in which the center angle of said recess and the uppermost upstream end portion is formed is arranged so as to be within 45 ° of the swirling flow generating vanes The fixed swirl described. The fixed swirl blade according to any one of claims 1 to 6 ,
A bubble generator configured to generate air bubbles by introducing air into a swirl flow generated by the fixed swirl vane. The fixed swirl blade according to any one of claims 1 to 6 ,
A bubble generating device that introduces air into the swirling flow generated by the fixed swirl blade to generate bubbles, and
A bath hot water supply device configured to supply air bubbles into a bathtub by the air bubble generating device.

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