JP5928215B2 - Bathtub adapter and water heater using the same - Google Patents

Description

  The present invention relates to a bathtub adapter that allows hot water mixed with fine bubbles to flow into a bathtub, and a water heater using the same.

  As a prior art, for example, as described in Patent Document 1, a bubble ejection device that ejects fine bubbles into warm water supplied to a bathtub is known. The bubble ejection device of the prior art is provided with an ejection nozzle that faces and opens in the bathtub, and ejects hot water and fine bubbles from the ejection nozzle into the bathtub.

JP 2005-230041 A

  In the above-described prior art, since the ejection nozzle is set in a certain direction in the bathtub, it is difficult to diffuse the fine bubbles throughout the bathtub, and the fine bubbles cannot be attached to the whole body of the bather. . For this reason, in a prior art, there exists a problem that the effect (what is called a warm bath effect) which makes a bather attach a micro bubble and increases a blood flow rate cannot fully be exhibited.

  Moreover, in a prior art, the attachment position of the bubble ejection apparatus with respect to a bathtub may differ according to a condition. If a specific example is given, a bubble ejection apparatus may be attached to the long side of the bathtub which makes a substantially rectangular shape, or may be attached to the short side. For this reason, in the state where the ejection nozzle is set in a certain direction as described above, the diffusibility of the fine bubbles with respect to the entire bathtub greatly depends on the attachment position of the bubble injection device, and the fineness depends on the attachment position. There is also a problem that variation occurs in the diffusibility of the bubbles (degree of warm bath effect).

  The present invention has been made to solve the above-described problems, and can sufficiently ensure the diffusibility of fine bubbles without being affected by the mounting position or the like, so that the fine bubbles can be stabilized throughout the bath. An object of the present invention is to provide a bathtub adapter that can be diffused automatically and a water heater using the same.

The bathtub adapter according to the present invention has a bathtub metal fitting installed outside the bathtub and a partition plate arranged facing the inside of the bathtub, and the bathtub metal fitting and the partition board are installed across the wall surface of the bathtub. The adapter body, the return fitting connected to the outflow side of the hot-bath ejector that mixes air bubbles with hot water, and the partition plate are arranged side by side in the horizontal direction and open in the bathtub respectively. A plurality of outlets for discharging hot water flowing into the return passage into the bathtub and a position before the flow of hot water flowing into the return passage branches toward the plurality of outlets in the vertical direction. A bubble miniaturizing rod to be branched .

  ADVANTAGE OF THE INVENTION According to this invention, the hot water containing a fine bubble can be discharged in a different direction from the some discharge port of a bathtub adapter in a bathtub, respectively. Thereby, the fine bubble which generate | occur | produces from a warm bath ejector can be stably diffused to the whole bathtub, without being influenced by the attachment position of the bathtub adapter in a bathtub, etc. Therefore, the performance of the warm bath ejector can be stably exhibited and a high warm bath effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows the hot water storage type water heater to which the bathtub adapter by Embodiment 1 of this invention is applied. It is a circuit block diagram which shows a hot water filling operation. It is a circuit block diagram which shows bathtub water circulation driving | operation. It is a longitudinal cross-sectional view which fractures | ruptures and shows the hot bath ejector in FIG. 1 in the plane containing a central axis. It is a longitudinal cross-sectional view which fractures | ruptures and shows the bathtub adapter in FIG. 1 by the vertical surface containing a central axis. It is a longitudinal cross-sectional view which fractures | ruptures and shows a bathtub adapter in the horizontal surface containing a central axis. It is the front view seen from the left side in FIG. 5 in the state which removed the bathtub adapter.

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 an overall configuration diagram showing a hot water storage type water heater to which a bathtub adapter according to Embodiment 1 of the present invention is applied. As shown in this figure, the hot water storage type hot water heater 1 of the present embodiment includes a hot water storage tank unit 2, a heat pump unit 60, a hot bath ejector 80 described later, a bathtub adapter 90, and the like.

  The hot water storage tank unit 2 and the heat pump unit 60 are connected via a heat pump inlet pipe 41 and a heat pump outlet pipe 42. The hot water storage tank unit 2 includes a control unit 70. Operations of various valves, pumps, and the like included in the hot water storage tank unit 2 and the heat pump unit 60 are controlled by a control unit 70 that is electrically connected to these devices. Hereinafter, each component of the hot water storage type water heater 1 will be described.

  The heat pump unit 60 heats (boils) the low temperature water taken out from the hot water storage tank unit 2 by a heat pump cycle. The heat pump unit 60 includes a compressor 61, a heating heat exchanger 62, an expansion valve 63, and an air heat exchanger 64, and a refrigeration cycle (heat pump cycle) in which these devices are connected in an annular shape by a refrigerant circulation pipe 65. It is equipped with. The boiling heat exchanger 62 exchanges heat between the refrigerant flowing through the refrigerant circulation pipe 65 and the low-temperature water taken out from the hot water storage tank unit 2. The heat pump outlet temperature sensor 66 is a temperature sensor that detects the temperature of high-temperature water that has flowed out of the boiling heat exchanger 62, and is provided in the heat pump outlet pipe 42.

  The hot water storage tank unit 2 is equipped with the following various parts and piping. The hot water storage tank 10 is constituted by a substantially cylindrical sealed tank for storing hot water. A water supply pipe 3 for supplying water from a water source such as a water supply is connected to the introduction port 5 provided in the lower part of the hot water storage tank 10. A hot water supply pipe 4 for supplying hot water in the hot water storage tank 10 to the outside of the water heater, a tank upper pipe 44, and a bath hot water supply pipe 35 are provided in a first upper port 6 provided in the upper part of the hot water storage tank 10. It is connected. In the hot water storage tank 10, high temperature water heated by the heat pump unit 60 is stored from the upper part of the tank, and low temperature water supplied by the water supply pipe 3 is introduced from the lower part of the tank. Hot water is stored so as to occur.

  The hot water storage tank unit 2 is equipped with a circulation pump 21 and a use side heat exchanger 22. The circulation pump 21 circulates hot water through various pipes in the hot water storage tank unit 2 as will be described later. The use-side heat exchanger 22 heats secondary-side heating target water (tub circulation water, heating circulation water, etc.) using primary high-temperature water supplied from the hot water storage tank 10 or the heat pump unit 60. To do. In the present embodiment, as a circuit connected to the secondary side of the use side heat exchanger 22, a bath water circulation circuit 51 described later will be described as an example.

  Next, valves and piping mounted on the hot water storage tank unit 2 will be described. The hot water storage tank unit 2 includes a first three-way valve 31, a second three-way valve 32, a four-way valve 33, a bath hot water solenoid valve 34, and an air solenoid valve 36. The three-way valves 31 and 32 each have two inlets (a port and b port) into which hot water flows and one outlet (c port) from which hot water flows out, and either one of the a port or the b port. The hot water path can be switched so that hot water flows in from the water. The four-way valve 33 has two inlets (b port and c port) through which hot water flows and two outlets (a port and d port) through which hot water flows out, and has three paths (that is, an ab path). , B-d route, and cd route).

  The bath hot water solenoid valve 34 is provided in the middle of the bath hot water supply pipe 35 connected between the first upper port 6 of the hot water storage tank 10 and the return pipe 53 of the bathtub water circulation circuit 51. The valve is opened when water is supplied to the bathtub 50. The air solenoid valve 36 opens when fine bubbles are mixed in the bath water by a hot bath ejector 80 described later, and supplies air to the hot bath ejector 80 via the air pipe 37.

  The hot water storage tank unit 2 includes a tank lower pipe 40, a heat pump inlet pipe 41, a heat pump outlet pipe 42, a first tank upper pipe 43, a second tank upper pipe 44, a tank return pipe 45, and a use side heat exchanger 1. A secondary side inlet pipe 46, a use side heat exchanger primary side outlet pipe 47, a bypass pipe 48 and an upper return pipe 49 are provided. The individual pipes will be described. First, the tank lower pipe 40 connects the first lower port 7 of the hot water storage tank 10 and the a port of the three-way valve 32, and the heat pump inlet pipe 41 is a c port of the three-way valve 32. And the inlet side of the heat pump unit 60 are connected. A circulation pump 21 is arranged in the middle of the heat pump inlet pipe 41. The heat pump outlet pipe 42 connects the outlet side of the heat pump unit 60 and the c port of the four-way valve 33. The first tank upper pipe 43 connects the second upper port 8 provided at the center or the upper part of the hot water storage tank 10 and the a port of the three-way valve 31. The first upper port 6 of the tank 10 and the b port of the three-way valve 31 are connected. The tank return pipe 45 connects the second lower port 9 provided at the center or lower part of the hot water storage tank 10 and the a port of the four-way valve 33. The use side heat exchanger primary side inlet pipe 46 connects the c port of the three-way valve 31 and the primary side inlet of the use side heat exchanger 22, and the use side heat exchanger primary side outlet pipe. 47 connects the primary side outlet of the use side heat exchanger 22 and the b port of the three-way valve 32. Further, the bypass pipe 48 connects a part of the heat pump inlet pipe 41 downstream of the circulation pump 21 and the b port of the four-way valve 33, and the upper return pipe 49 is connected to the d port of the four-way valve 33. The middle of the tank upper pipe 44 is connected.

  Next, a circuit on the bathtub 50 side connected to the hot water storage type hot water heater 1 will be described. The bathtub 50 is provided with a bathtub water circulation circuit 51, a bath circulation pump 54 and a bathtub outlet side temperature sensor 55, and a hot bath ejector 80 and a bathtub adapter 90 described later. The bathtub water circulation circuit 51 circulates the bathtub water stored in the bathtub 50 to the external use side heat exchanger 22. The bathtub water circulation circuit 51 flows the bathtub water flowing from the bathtub 50 into the secondary side inlet of the usage side heat exchanger 22 and the bathtub water flowing out from the secondary side outlet of the usage side heat exchanger 22 in the bathtub 50. And a return pipe 53 for returning to the position. The use side heat exchanger 22 constitutes a heating means for heating the bathtub water flowing through the bathtub water circulation circuit 51.

  The bath circulation pump 54 circulates bathtub water in the bathtub water circulation circuit 51, and is provided in the going pipe 52, for example. The bathtub outlet side temperature sensor 55 is a sensor that detects the temperature of the bathtub water on the outlet side of the bathtub 50. The hot bath ejector 80 mixes bubbles into the bathtub water returned to the bathtub 50 via the bathtub adapter 90, and is provided in the return pipe 53. The bathtub adapter 90 connects the bathtub water circulation circuit 51 (the outgoing pipe 52 and the return pipe 53) to the bathtub 50, and is disposed on the downstream side (outflow side) of the hot bath ejector 80. For example, the bathtub adapter 90 is installed on the wall surface of the bathtub 50. ing. In addition, the structure of the warm bath ejector 80 and the bathtub adapter 90 is later mentioned with reference to FIG.

  Next, with reference to FIG.2 and FIG.3, the basic driving | operation relevant to a bathtub is demonstrated among the driving | operations of a hot water storage type water heater. FIG. 2 is a circuit configuration diagram illustrating a hot water filling operation, and FIG. 3 is a circuit configuration diagram illustrating a bath water circulation operation. First, the hot water filling operation will be described. In this operation, as shown in FIG. 2, the hot water solenoid valve 34 is opened, and the hot water stored in the upper part of the hot water storage tank 10 flows into the bathtub water circulation circuit 51. Thereby, hot water can be stretched in the bathtub 50.

  On the other hand, the bathtub water circulation operation is used, for example, when bathing in a state where bubbles are generated in the bathtub. In the bathtub water circulation operation, as shown in FIG. 3, the bath water is circulated between the bathtub 50 and the bathtub water circulation circuit 51 by operating the bath circulation pump 54. Then, air is introduced into the hot bath ejector 80 via the air pipe 37 by opening the air solenoid valve 36. As a result, fine bubbles are generated from the hot bath ejector 80, and the bathtub water in which the fine bubbles are mixed is supplied into the bathtub 50 through the bathtub adapter 90.

  Next, the configuration of the hot bath ejector 80 will be described with reference to FIG. FIG. 4 is a longitudinal sectional view showing the hot bath ejector in FIG. 1 cut along a plane including the central axis. As shown in this figure, a warm bath ejector 80 is formed of a housing 81 that is formed in a cylindrical shape and that is open on both sides in the axial direction, an annular reduced diameter portion 82 that is formed in the housing 81 as the most reduced diameter portion, and a reduced diameter portion. An air inlet 83 that opens to the inside and outside of the housing 81 at a position corresponding to the diameter portion 82 is provided.

  The housing 81 is connected in the middle of the return pipe 53 of the bathtub water circulation circuit 51 shown in FIG. The inner wall surface of the housing 81 is reduced in diameter in a substantially conical shape from the upstream side toward the reduced diameter portion 82, and is increased in diameter in a substantially conical shape from the reduced diameter portion 82 toward the downstream side. The housing 81 and the reduced diameter portion 82 may be integrally formed, or may be formed by combining separate parts. An air pipe 37 shown in FIG. 1 is connected to the air inlet 83.

  When the bath water circulation operation is executed, the bath circulation pump 54 is operated, whereby the bath water circulates in the bathtub water circulation circuit 51, and a water flow is formed inside the housing 81. At this time, since the negative pressure is generated by increasing the flow velocity of the water flow at the position of the reduced diameter portion 82, when the air electromagnetic valve 36 is opened, air is sucked into the housing 81 through the air pipe 37. The The sucked air becomes fine bubbles having a diameter of about 100 μm, passes through the bathtub adapter 90 from the warm bath ejector 80, and is discharged into the bathtub 50.

  Next, the configuration of the bathtub adapter 90 will be described with reference to FIGS. FIG. 5 is a longitudinal sectional view showing the bathtub adapter in FIG. 1 cut along a vertical plane including the central axis, and FIG. 6 is a longitudinal sectional view showing the bathtub adapter broken along a horizontal plane including the central axis. . FIG. 7 is a front view of the bathtub adapter as viewed from the left side in FIG. 5 with the cover removed. As shown in FIGS. 5 and 6, the bathtub adapter 90 is installed on, for example, a wall surface 50 </ b> A of the bathtub 50, and connects the bathtub 50 and the bathtub water circulation circuit 51. The bathtub adapter 90 includes an adapter main body 91, an outgoing passage 94, a return passage 95, a suction port 96, a discharge nozzle 97, a discharge port 98, a bubble miniaturizing rod 99, a cover 100, and the like.

  The adapter main body 91 includes a bathtub metal fitting 92 installed outside the bathtub 50 (on the back side of the wall surface portion 50 </ b> A), and a substantially disc-shaped partition plate 93 disposed facing the bathtub 50. As shown in FIG. 6, the bathtub fitting 92 is provided with a going path 94 connected to the going pipe 52 of the bathtub water circulation circuit 51 and a return path 95 connected to the return pipe 53. As shown in FIGS. 6 and 7, the partition plate 93 includes, for example, two suction ports 96 that draw hot water in the bathtub 50 into the passage 94 and fine bubbles that flow into the return passage 95 from the warm bath ejector 80. For example, two discharge nozzles 97 that discharge hot water into the bathtub 50 and discharge ports 98 that are opened at the distal ends of the discharge nozzles 97 are provided.

  The suction ports 96 are arranged on both sides of the partition plate 93 in the left-right direction (horizontal direction) so as to communicate with the going passage 94 through the space in the bathtub fitting 92. For example, the discharge nozzle 97 is formed in an elongated cylindrical shape on the tip side, and protrudes obliquely downward in the forward direction from the surface side of the partition plate 93 facing the bathtub 50 as shown in FIG. That is, the two discharge ports 98 are configured to discharge hot water in an obliquely downward direction in the front direction. The “front direction” is defined as a direction away from the wall surface portion 50A of the bathtub 50, for example. Further, as shown in FIGS. 6 and 7, the two discharge nozzles 97 are arranged side by side in the horizontal direction when viewed from the upper side, and project substantially in a V shape so that the distal end side is expanded. That is, the two discharge ports 98 are configured to discharge hot water in different directions so that the discharge directions of the hot water expand in a substantially V shape with each other in a state of being aligned in the horizontal direction. .

  According to the above configuration, the following operational effects can be obtained. First, since a plurality of (for example, two) discharge nozzles 97 are installed and a discharge port 98 is formed at the tip of each discharge nozzle 97, fine bubbles are introduced from the plurality of discharge ports 98 in different directions. Hot water can be discharged. Thereby, the fine bubbles generated from the hot bath ejector 80 can be stably diffused throughout the bathtub without being affected by the mounting position of the bathtub adapter 90 in the bathtub 50. That is, for example, even when the bathtub adapter 90 is attached to either the long side or the short side of the bathtub 50 having a rectangular shape, the diffusibility of the fine bubbles can be ensured almost equally, and the performance of the hot bath ejector 80 can be improved. It can be exhibited stably. Therefore, it is possible to realize a water heater that provides a high warm bath effect during bathing.

  Moreover, since each discharge port 98 discharges hot water toward the front direction, the diffusibility of the fine bubble especially in the center vicinity of the bathtub 50 can be improved. Thereby, regardless of the bathing posture or bathing position in the bath 50, fine bubbles can be attached to the whole body of the bather, and the blood flow in the whole body is increased by the fine vibration when the fine bubbles burst. A high warm bath effect can be obtained. In particular, air (bubbles) has a thermal conductivity as small as about 1/30 compared to bath water, so by adhering fine bubbles to the whole body, it was absorbed by the bather compared to normal bathing. Heat can be efficiently held in the body, and a warm bath effect can be remarkably exhibited.

  Further, since the discharge nozzles 97 protrude in a substantially V shape so that the tip sides of the discharge nozzles expand, the discharge ports 98 expand in such a manner that the discharge directions of the hot water form a substantially V shape. Thus, hot water can be discharged in different directions. Thereby, a fine bubble can be efficiently discharged to the wide range in the bathtub 50, and the diffusibility of a fine bubble can be improved further.

  For example, when the opening position of each discharge port is shifted in the vertical direction (vertical direction), the fine bubbles are discharged from the upper discharge port by buoyancy, so the fine bubbles are evenly distributed from the plurality of discharge ports. Cannot be discharged. On the other hand, in the present embodiment, since the discharge ports 98 are arranged in the horizontal direction, fine bubbles can be discharged uniformly from these discharge ports 98, and a part of the inside of the bathtub 50 is fine. It is possible to prevent the bubbles from being discharged in an uneven manner.

  Further, since each discharge port 98 is configured to discharge hot water obliquely downward with respect to the horizontal direction, the following operational effects can be obtained when a chasing operation is performed. The reheating operation is a use-side heat exchanger that circulates bathtub water in the bathtub 50 through the bathtub water circulation circuit 51 and uses hot water stored in the upper part of the hot water storage tank 10 or hot water heated by the heat pump unit 60. 22 circulates to the primary side and heats the bath water. At the time of chasing operation, if hot water is discharged from the bathtub adapter in the horizontal direction, this hot water does not reach the bottom of the bathtub 50, and a temperature boundary layer may be generated in the bathtub water. On the other hand, in the present embodiment, hot water is discharged obliquely downward from each discharge port 98 during a chasing operation or the like, so that the hot water reaches the bottom surface of the bathtub 50 to stir the bathtub water. The hot water in the entire bathtub can be heated evenly.

  Next, the configuration of the bubble refining rod 99 will be described. The bubble refining rod 99 collides with the flow of hot water before the flow of hot water flowing into the return passage 95 branches to each discharge nozzle 97, and makes the bubbles in the hot water fine. As shown in FIGS. 5 and 6, the bubble refining rod 99 is formed of, for example, a rod having a triangular cross-sectional shape, and is disposed in the branch upstream portion 95A of the return passage 95, and on both sides in the length direction. Is fixed to the partition plate 93. Here, the branch upstream portion 95A is located upstream of the branch portion where each discharge nozzle 97 branches from the downstream end of the return passage 95, that is, the flow of hot water flowing into the return passage 95 is the discharge nozzle 97. It corresponds to the part that reaches before branching to.

  Further, the bubble refining rod 99 extends in a direction perpendicular to the flow direction so as to cross the flow of hot water in the branch upstream portion 95A. More specifically, the bubble refining rod 99 extends in the horizontal direction through the central position of the hot water flow path having a substantially circular shape in the branch upstream portion 95A. It is divided into two flow paths positioned on the upper side and the lower side with the chemical rod 99 interposed therebetween. Further, the bubble refining rod 99 is arranged such that one side of a triangle having a cross-sectional shape is perpendicular to the flow of hot water, and the apex facing this side faces the downstream side.

  According to the above configuration, since the hot water flowing into the return passage 95 can collide with the bubble refining rod 99, the fine bubbles in the hot water can be further refined by this collision, and the hot bath effect is improved. Can be made. In addition, the bubble miniaturizing rod 99 can vertically branch the hot water flow from the central position while colliding perpendicularly to the hot water flow before the hot water flow branches to the discharge nozzles 97. Thereby, the refinement of the bubbles can be efficiently performed, the flow of the hot water in the branch upstream portion 95A can be agitated, and the flow rate of the hot water (fine bubbles) flowing into each discharge nozzle 97 can be equalized. As a specific example, when the bubble refining rod 99 is used, the flow rate deviation between the discharge nozzles 97 can be suppressed to about 1/10 as compared with the case where the bubble miniaturizing rod 99 is not used. Therefore, by using the bubble miniaturizing rod 99, the fine bubbles can be discharged uniformly from the plurality of discharge ports 98.

  On the other hand, the cover 100 shown in FIGS. 5 and 6 is attached to the partition plate 93 at a position covering the suction port 96 and each discharge nozzle 97, and is formed in a flat, covered cylindrical shape. The cover 100 is provided with a plurality of holes, slits and the like that allow passage of bathtub water. Each discharge nozzle 97 is accommodated in the cover 100 with only the periphery of the discharge port 98 exposed.

In the first embodiment, the case where a plurality of discharge nozzles 97 each having one discharge port 98 is used is illustrated. However, in the present invention, it is not always necessary to use a discharge nozzle. For example, a configuration in which a plurality of discharge ports 98 are opened in the partition plate 93 may be adopted. Also,
One discharge nozzle may protrude from the partition plate 93, and a plurality of discharge ports 98 may be opened in the discharge nozzle.

  Further, in the first embodiment, the case where the bubble miniaturizing rod 99 is used is illustrated, but the present invention is not limited to this, and for example, a mesh-like or porous member is arranged in the flow of hot water, The bubble miniaturization part may be configured by providing a large number of protrusions on the wall surface of the channel. In the first embodiment, the case where the two discharge ports 98 are provided is illustrated, but the number of discharge ports in the present invention may be set to a plurality of three or more.

DESCRIPTION OF SYMBOLS 1 Hot water storage type water heater 2 Hot water storage tank unit 10 Hot water storage tank 21 Circulation pump 22 Use side heat exchanger (heating means)
34 Bath Hot Water Solenoid Valve 35 Bath Hot Water Supply Pipe 36 Air Solenoid Valve 37 Air Pipe 50 Bathtub 51 Bathtub Circulation Circuit 52 Outgoing Pipe 53 Return Pipe 54 Bath Circulation Pump 60 Heat Pump Unit 70 Controller 80 Hot Bath Ejector 81 Housing 82 Reduced Diameter 83 Air Introduction Port 90 Bathtub adapter 91 Adapter main body 92 Bathtub fitting 93 Partition plate 94 Passage 95 Return side path 95A Branch upstream part 96 Suction port 97 Discharge nozzle 98 Discharge port 99 Bubble refinement rod (bubble refinement part)
100 cover

Claims (7)

An adapter main body having a bathtub fitting installed outside the bathtub and a partition plate arranged facing the bathtub, and the bathtub fitting and the partition plate sandwiching a wall surface portion of the bathtub; ,
A return passage connected to the outflow side of the hot bath ejector, which is provided in the bathtub fitting and mixes bubbles into hot water;
A plurality of outlets that are provided side by side in the partition plate and opened in the bathtub, and discharge hot water flowing into the return passage from the warm bath ejector into the bathtub;
A bubble refinement rod that branches the flow of hot water in the vertical direction at a position before the flow of hot water that has flowed into the return passage is branched toward the plurality of discharge ports,
Bathtub adapter with. The bathtub adapter according to claim 1, wherein the bubble miniaturizing rod is provided on the partition plate and extends in a horizontal direction so as to cross the flow of the hot water. The bubble refining rod has a triangular cross-sectional shape, and is arranged so that one side of the triangle forming the cross-sectional shape is perpendicular to the flow of hot water, and collides with the flow of hot water. The bathtub adapter according to claim 1, wherein the bathtub adapter is configured to refine bubbles in the hot water. The plurality of discharge ports, according to claim 1 to 3 tub adapter according to any one of the becomes a configuration for discharging the hot water in the direction of obliquely downward before a direction away from the wall portion of the tub.   The bathtub adapter according to any one of claims 1 to 4, wherein the plurality of discharge ports are configured to discharge hot water in different directions such that the discharge directions of the hot water expand from each other. The microbubble rods, one of the return through the center position of the hot water flow paths flowing into passage becomes constituted by bars extending in a direction perpendicular and the hot water flow according to claim 1 to 5 The bathtub adapter according to claim 1 . The bathtub adapter according to any one of claims 1 to 6 ,
A bathtub water circulation circuit connected to the bathtub via the bathtub adapter and circulating the bathtub water stored in the bathtub to the outside;
Heating means for heating the bathtub water flowing through the bathtub water circulation circuit;
A warm bath ejector that is provided in the bathtub water circulation circuit on the upstream side of the bathtub adapter and mixes bubbles into the bathtub water returned to the bathtub via the bathtub adapter;
Hot water heater equipped with.

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