JP2011015784A - Jet bathing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jet bathing device which achieves both of a straight jet and a reciprocating self-induced vibration jet by switching them and which involves bubbles in the jet and yet is made calm.SOLUTION: In order to reduce the tear-off sound of air pulled in by a negative pressure generated inside a chamber 25 by a jet jetted from a flow path cross section contraction part 23 when a nozzle 11 performs jetting, a chamber air introduction port 37 is formed in the range of the downstream side of the chamber 25.

Description

  The present invention relates to a jet bath apparatus provided with a jet nozzle for jetting a jet into a bathtub, and in particular relates to a jet bath apparatus that ensures the safety of the user.

  There are jet nozzles provided on a conventional bathtub wall, and jets are jetted from the nozzles into the bathtub, most of which jet jets straight (see, for example, Patent Document 1), and jets are bathed. It was difficult to obtain a variety of massage feelings because it hit a part of a person's body locally, and the stimulation received by the jet was monotonous and easy to get bored.

Further, Patent Document 2 discloses a jet ejecting apparatus in which bubbles are involved in order to give a greater stimulus while changing the ejecting direction with a structure in which no movable part is provided in the nozzle itself.
However, in such a structure, there is a problem that a large noise is generated when bubbles are involved.

JP 7-178142 A Japanese Patent Laid-Open No. 4-176461

  The present invention has been made to solve the above problems, and the object of the present invention can be realized by switching both a straight jet jet and a jet jet that oscillates in a reciprocating manner. It is providing the jet bath apparatus which can achieve.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a bathtub, a suction port that is opened in a bathtub wall of the bathtub and is stored in the bathtub, and a bathtub from the suction port. A pressurizing device that sucks in water, pressurizes and discharges the water, and a single-structure housing that is held against the bath wall below the overflow edge of the bath, and is introduced into the housing A jet nozzle device for jetting water into the bathtub while changing the jet direction, wherein the jet nozzle extends in the axial direction of the running water inlet and the casing. A chamber formed in the housing, and the flowing water introduction part is provided at an upstream end part into which pressurized bath water sent from the pressurizing apparatus is introduced, and at the upstream end part. The flow path is made narrower and the downstream end communicating with the chamber; The chamber is provided at the upstream end in the axial direction, and the channel cross-section abruptly expanded portion with respect to the downstream end of the flowing water introduction portion, and the shaft A spout opening at the downstream end in the direction facing the inside of the bathtub, and a cross-sectional shape from the flow passage cross-section sudden expansion portion to the spout is formed in a substantially rectangular shape, The downstream end opening facing the inside of the chamber at the downstream end of the contracted portion flowing water introduction portion is located on the inner side of the contour line that forms the cross-sectional shape of the chamber in a front view when the inside of the chamber is viewed from the ejection port. The flow path cross-sectional contraction part has a gap between the opening edge of the downstream end opening of the flowing water introduction part and the contour line, and connects the atmosphere and the outer space of the chamber in order to take the atmosphere into the chamber. The first inlet and the outside of the chamber A second suction port is formed to connect the open space portion and the inside of the chamber, and the second suction port is a length in the chamber from the flow path cross-sectional contraction portion flowing water introduction portion to the ejection port in the chamber. A jet bath apparatus is provided that is formed in a range of a lower upstream side from a position that is divided into two equal parts.
According to this, it is possible to give a greater stimulus to the bather by entraining the bubbles in the jet, and at the same time, the suction port is made to have the length in the chamber from the flow path cross-sectional contraction part flowing water introduction part to the jet outlet. By forming in the range downstream from the bisected position, the flow rate with respect to the hole is lowered, and the noise level affected by the flow rate can be reduced.

According to a second aspect of the present invention, there is provided a jet bath apparatus, wherein the first suction port and the second suction port have a plurality of holes.
According to this, it is possible to reduce the noise level by enlarging the suction area without disturbing the reciprocating self-excited vibration jet operation without bubbles.

According to a third aspect of the present invention, there is provided a jet bath apparatus having a switching valve for opening and closing the first suction port.
According to this, by operating the switching valve, it is possible to eject two jets including a jet containing bubbles and a jet containing no bubbles.

  ADVANTAGE OF THE INVENTION According to this invention, it can implement | achieve by switching both a straight jet jet and the jet jet which carries out a reciprocating self-excited vibration, and can provide the jet jet apparatus with little noise, including a bubble.

The schematic diagram which shows schematic structure of the jet bath apparatus which concerns on embodiment of this invention. The schematic diagram which shows a specific example of an air supply system in the jet bath apparatus which concerns on embodiment of this invention. The schematic cross section of the jet nozzle in the same jet bath apparatus. The front view which looked at the same jet nozzle from the jet nozzle side. The schematic cross section which shows the other specific example of the jet nozzle in the same jet bath apparatus. The front view which shows the other specific example which looked at the same jet nozzle from the jet nozzle side. The schematic diagram of the chamber in the same jet nozzle. The schematic diagram which shows the other specific example of the cross-sectional shape of the chamber in the same jet nozzle, and a jet nozzle. The schematic diagram which shows the other specific example of the cross-sectional shape of the chamber in the same jet nozzle, and a jet nozzle. The schematic diagram for demonstrating the behavior of the flowing water in the same jet nozzle. The schematic diagram which shows the behavior accompanying the time change of the center position of the jet collision part with respect to the observation body made to collide the jet flow from the jet nozzle with the observation object which spreads in the planar shape provided in the position of 70 mm from the jet nozzle. The schematic diagram which shows the movement locus | trajectory for every 10 frames of the captured images in Fig.8 (a). The graph which shows the appearance rate of the jet jet vibration amplitude in the jet nozzle which concerns on embodiment of this invention. The graph which shows the PQ characteristic of the pressure P and the flow volume Q in the jet nozzle which concerns on embodiment of this invention. The graph which shows the jet jet direction switching frequency characteristic in the jet nozzle which concerns on embodiment of this invention. The image which shows the mode of the switching of the jet ejection direction in the jet nozzle which concerns on embodiment of this invention. The schematic diagram which shows the other specific example of an air supply system | strain in the jet bath apparatus which concerns on embodiment of this invention. The schematic diagram which shows the other specific example of an air supply system in the jet bath apparatus which concerns on embodiment of this invention. The schematic diagram which shows the experimental condition difference of the chamber air inlet in the jet nozzle which concerns on embodiment of this invention. The graph which shows the noise level comparison of the arrangement | positioning difference in a chamber when the chamber air introduction port is (phi) 3x6 piece. The graph which shows the noise level comparison of the arrangement | positioning difference in a chamber when a chamber air inlet port is (phi) 3x9 piece. The graph which shows the noise level comparison at the time of the number difference of several holes of (phi) 3x6 and (phi) 3x9 of a chamber air inlet.

  Drawing 1 is a mimetic diagram showing a schematic structure of a jet bath device concerning an embodiment of the present invention.

  The jet bath device according to the present embodiment is a pressurizing device connected between the bathtub 1, the suction port 5 opened in the bathtub wall of the bathtub 1, the circulation paths 6 and 8, and the circulation paths 6 and 8. A certain pump 7 and two jet nozzles 11 provided on the bathtub wall are provided.

  The bathtub 1 has a pair of long side bathtub walls 3a, 3b facing each other substantially in parallel and a pair of short side bathtub walls 4a, 4b facing each other substantially in parallel.

  The suction port 5 is formed in one of the pair of long side bathtub walls 3a and 3b (long side bathtub wall 3a in the example shown in FIG. 1). When the pump 7 is driven, the bath water (including hot water) stored in the bathtub 1 is sucked into the circulation path 6 through the suction port 5.

  In general, a bather takes a bath with a posture in which his / her back is directed to one of a pair of short-side bathtub walls 4a and 4b facing each other and his / her foot is directed to the other short-side bathtub wall. When it is formed on the wall, there is a concern that the suction port 5 is blocked by the bather's back and soles and an excessive load is applied to the pump 7. Therefore, it is desirable to form the suction port 5 in the long side bathtub wall that is not easily blocked by a part of the body of the bather.

  One end of the circulation path 6 is connected to the suction port 5, and the other end is connected to the suction port of the pump 7. One end of the circulation path 8 is connected to the discharge port of the pump 7, and the other end is connected to the jet nozzle 11. The pump 7 sucks bathtub water into the circulation path 6 from the suction port 5, pressurizes the sucked bathtub water, and discharges it to the circulation path 8 on the downstream side of the pump 7. The pressurized bathtub water discharged from the pump 7 flows into the jet nozzle 11. In addition, when not in use, the pump 7 is desirably provided above the suction port 5 in order to drain residual water inside the pump 7.

  In the present embodiment, two jet nozzles 11 are attached to one of the pair of short-side bathtub walls 4a and 4b (short-side bathtub wall 4a in the example shown in FIG. 1). The two jet nozzles 11 are held by the short-side bathtub wall 4a at the same height and separated by a predetermined distance in the horizontal direction. In addition, if a bather takes a bath with the posture which turned the back to the short side bathtub wall 4a in which the jet nozzle 11 was provided, the jet from the jet nozzle 11 can be received in the back and the waist, and the short side bathtub wall If bathing is performed with the feet facing 4a, the jet from the jet nozzle 11 can be received on the soles and calves.

FIG. 3 is a schematic cross-sectional view of the jet nozzle 11.
FIG. 4 is a front view of the jet nozzle 11 in FIG. 3 as viewed from the jet outlet 26 side.
FIG. 5 is a schematic cross-sectional view showing another specific example of the jet nozzle 11.
FIG. 6 is a front view showing another specific example of the jet nozzle 11 in FIG. 3 viewed from the jet outlet 26 side.

  The jet nozzle 11 roughly includes a cylindrical body 20 that is substantially cylindrical and extends substantially straight, and a curved portion 30 that is provided at an upstream end portion in the axial direction of the cylindrical body 20. The cylindrical body 20 is provided inside the cylindrical outer cover 31, and the bending portion 30 is provided inside the elbow cover 32. The cylindrical body 20 and the bending portion 30 may have an integrally formed structure, or separate members may be combined.

  As shown in FIG. 4, an annular flange portion 34 having a circular through hole 34 a formed in the center portion is provided at the downstream end portion of the outer cover 31. The downstream end face including the jet outlet 26 of the cylindrical body 20 is exposed from the through hole 34a.

  A flowing water introduction part 22 is formed inside the curved part 30, and a flowing water introduction port 21 formed at the uppermost stream end of the upstream end of the flowing water introduction part 22 is connected to the circulation path 8 described above. 33.

  In FIG. 1, the jet nozzle 11 is held by the short-side bathtub wall 4 a so that the jet nozzle 26 faces the inside of the bathtub 1 below the overflow edge of the bathtub 1. Here, the “overflow edge” means the edge (or rim) of the bathtub 1 that first overflows from the bathtub 1 when the bathtub water is accumulated in the bathtub 1. With such a configuration, it is possible to reliably jet the jet flow from the jet nozzle 11 into the bath water while the bath water is stored in the bath 1 and a person bathes.

  The downstream end of the flowing water introduction part 22 functions as a flow path cross-sectional contraction part 23 in which the flow path cross section is most reduced in the flowing water introduction part 22. The most downstream end of the flow path cross-sectional contraction portion 23 opens at the upstream end portion in the axial direction of the cylindrical body 20.

  The flow passage cross section of the flowing water introduction portion 22 is circular or elliptical, and the flow passage cross-sectional area gradually decreases from the upstream end portion toward the flow passage cross-section contraction portion 23 that is the downstream end portion. That is, the flow path of the flowing water introduction portion 22 is gradually narrowed from the upstream end portion toward the flow passage cross-sectional contraction portion 23 that is the downstream end portion.

  The center of the flow path cross section of the flow path cross-sectional contraction portion 23 coincides with the central axis C <b> 1 of the cylinder 20 and the chamber 25. The flow path center line C2 passing through the center of the flow path cross section of the flowing water introduction part 22 draws a curved line, and the flowing water introduction part 22 is curved. The downstream end position of the flow path center line C2 coincides with the central axis C1 of the cylinder 20 and the chamber 25.

  A chamber 25 extending in the axial direction of the cylindrical body 20 is formed inside the cylindrical body 20, and the flow path cross-sectional contraction portion 23 communicates with the chamber 25 and the flow path cross-section is reduced with respect to the chamber 25. ing. Further, the flow path cross-section contracting portion 23 is a straight tube having a constant diameter, extending substantially parallel to the axial direction of the chamber 25 with the center of the flow path cross section being coincident with the central axis C1 of the chamber 25. Is formed. That is, the flow path of the flowing water introduction section 22 is gradually narrowed from the upstream side toward the downstream side, and a straight pipe section (flow path cross-sectional contraction section 23) having a substantially constant flow path diameter follows the narrowed end. Yes.

  At the upstream end of the chamber 25 in the axial direction, the flow path cross section is rapidly enlarged with respect to the flow path cross-section contraction portion 23 (for example, the substantially rectangular shape of the chamber 25 in a front view when the chamber 25 is viewed from the ejection port 26). A flow path cross-sectional suddenly enlarged portion 24 having a length in the longitudinal direction of 4 times or more is provided.

  Although the outer shape of the cylindrical body 20 is cylindrical, the chamber 25 formed as a hollow hole in the inside thereof, as shown schematically in FIG. The cross-sectional shape from the nozzle 26 to the jet port 26 is formed in a substantially rectangular shape. That is, the cross-sectional shapes of the chamber 25 and the jet outlet 26 are substantially rectangular in a front view when the inside of the chamber 25 is viewed from the jet outlet 26. Here, the “substantially rectangular shape” is not limited to a rectangular shape in which four corners are formed at right angles, but a shape in which four corners are rounded (with a rounded shape) as shown in FIG. 9 includes an oval or racetrack shape having a pair of straight lines facing substantially parallel to each other as long sides and having a short side portion formed of a curve.

  At the downstream end in the axial direction of the chamber 25, a “substantially rectangular” spout 26 that is the same as the cross section of the chamber opens. The inner wall surface of the chamber 25 extends substantially parallel to the central axis C <b> 1 of the chamber 25 from the flow passage cross-section suddenly enlarged portion 24 to the jet outlet 26. The cross-sectional shape continues to the outlet 26 with a substantially rectangular shape. The upstream end portion in the axial direction in the chamber 25 functions as the flow path cross-sectional sudden expansion portion 24, and the downstream end portion in the axial direction in the chamber 25 functions as the ejection port 26.

  The channel wall surface from the channel cross-section contraction portion 23 to the channel cross-section rapid enlargement portion 24 changes substantially vertically. That is, the flow path wall surface of the flow path cross-section contraction portion 23 is substantially parallel to the axial direction of the chamber 25, whereas the upstream end in the axial direction of the chamber 25 that functions as the flow path cross-section sudden expansion portion 24. The end surface of the part is formed to extend outward in a radial direction following the flow path wall surface of the flow path cross-sectional contraction part 23. Due to this sudden change in the flow path wall surface, separation of the flow from the wall surface occurs at the flow path cross-sectional sudden expansion portion 24 as will be described later.

  The downstream end opening facing the chamber 25 in the flow path cross-section contracting portion 23 is formed in a circular shape, and the center thereof is located at the axial center of the chamber 25. The downstream end opening of the flow path cross-sectional contraction portion 23 is located on the inner side of the contour line that forms the cross-sectional shape of the chamber 25 in a front view when the inside of the chamber 25 is viewed from the ejection port 26, and is represented by a circle in FIG. The opening edge of the downstream end opening of the flow path cross-section contracting portion 23 is separated from the outline of the cross section of the chamber 25 represented in a rectangular shape in FIG. 4, and between the opening edge and the outline. There is a gap in the front view.

  The jet bath device according to the present embodiment also includes an air supply system for mixing bubbles into the jet nozzle 11. A specific example of the air supply system is shown in FIG.

  Below the bathtub rim 2 on the side of the short side bathtub wall 4a to which the nozzle 11 is attached, the air introduction pipe 43, the electromagnetic valve 41, and the check valve 42 are provided along with the pump 7 and the circulation path 8 described above. ing.

  In the air introduction pipe 43, one end on the upstream side of the air flow leads to an air intake port 2 a formed in the bathtub rim 2, and the other end on the downstream side branches into two and is connected to the two nozzles 11. Has been. In the middle of the air introduction pipe 43, an electromagnetic valve 41 that opens and closes the air flow path in the air introduction pipe 43 is provided as a switching device. Further, the switching device may be a manual valve, but if it is a solenoid valve, the control is easy. In this specific example, the solenoid valve 41 functions as a switching device that switches between a state in which the nozzle 11 ejects a jet containing bubbles and a state in which a jet containing no bubbles is ejected.

  The air introduction pipe 43 on the downstream side of the solenoid valve 41 is provided with a check valve 42 having a forward direction from the upstream side communicating with the air intake port 2a to the downstream side communicating with the nozzle 11, so Backflow to the inlet 2a side is prevented.

  As shown in FIG. 3, a chamber air introduction port 37 communicating with the inside of the chamber 25 is formed in a part of the peripheral surface of the cylindrical body 20 constituting the chamber wall so as to be opened on the longitudinal surface of the jet outlet 26 in the chamber 25. Yes. Further, a groove 36 is formed in the circumferential direction in the portion of the cylindrical body 20 where the chamber air introduction port 37 is formed, and the chamber air introduction port 37 is opened at a part of the bottom surface of the groove 36, and both communicate with each other. is doing. An air inlet 35 is attached to a portion of the outer cover 31 that faces the groove 36. The air suction port 35 communicates with the groove 36 and also communicates with the air introduction pipe 43.

  The outer cover 31 is held and fixed to the bathtub wall, and the cylindrical body 20 provided in the outer cover 31 is rotatable about the central axis C <b> 1 with respect to the outer cover 31. As shown in FIG. 4, the jet outlet 26 is open on the downstream end face of the cylindrical body 20, but the downstream end face is located outside the long side portion of the jet outlet 26 with the jet outlet 26 interposed therebetween. Two indentations 38 are formed. The indentation 38 is indented on the back side in FIG. The cylindrical body 20 can be rotated with respect to the outer cover 31 while pinching these two recesses 38 with a finger, and the longitudinal direction of the jet nozzle 26 is set to an arbitrary direction by the rotation of the cylindrical body 20. Can do. In FIG. 4, the short side direction of the ejection port 26 is vertical, but the direction can be freely changed to be horizontal or inclined with respect to the vertical and horizontal directions.

  In FIG. 5, a chamber air introduction port 37 communicating with the inside of the chamber 25 is formed in a part of the peripheral surface of the cylindrical body 20 constituting the chamber wall so as to be opened on the surface in the short direction of the ejection port 26 in the chamber 25. Another specific example is shown.

  In FIG. 6, the longitudinal direction of the ejection port 26 is vertical, but it can be freely changed to be horizontal or inclined with respect to the vertical and horizontal directions.

  The circumferential position of the chamber air inlet 37 formed in the cylinder 20 and the air inlet 35 fixed to the outer cover 31 shifts with the rotation of the cylinder 20, but there is a gap between them. Since the groove 36 that is present is formed over the entire circumference in the circumferential direction, even if the positions of the air suction port 35 and the chamber air introduction port 37 do not match, the air suction port 35 and the chamber air are disposed via the groove 36. It communicates with the introduction port 37. Therefore, air can be introduced from the atmosphere into the chamber 25 through the air intake port 2a, the air introduction pipe 43, the air suction port 35, the groove 36, and the chamber air introduction port 37. However, in this structure, since only one chamber air inlet 37 may be used, the wall surface of the chamber 25 is not uneven, and the jet performance of the nozzle is not affected. In addition, it is possible to obtain an effect that the processing and manufacturing are simplified while the structure is strong.

  Next, the operation of the jet bath device according to this embodiment will be described.

  When a bather operates a switch of a controller (not shown) provided in the vicinity of the bathtub 1, the pump 7 described above is activated, and the bathtub water stored in the bathtub 1 is sucked into the circulation path 6 from the suction port 5. . The sucked bathtub water is pressurized by the pump 7 and introduced into the flowing water introduction part 22 of the jet nozzle 11 through the circulation path 8.

  Here, the diagrams shown on the left side in FIGS. 10A to 10D are schematic diagrams for explaining the behavior of flowing water in the chamber 25 in a state where the electromagnetic valve 41 is closed and bubbles are not mixed. The right side of the figure shows a front view as seen from the outlet 26 side. In this front view, the position of the ejected jet viewed from the front side is schematically represented by a one-dot chain line circle. The left figure in (a) corresponds to the AA cross section in the right figure, and the same applies to each figure in (b) to (d).

  The pressurized bathtub water introduced into the flowing water introduction part 22 flows into the chamber 25 as a jet through the flow path cross-sectional contraction part 23 and the flow path cross-section rapid enlargement part 24 in order. When the pressurized bathtub water flows into the chamber 25 from the flow path cross-section contracting portion 23, it becomes impossible to flow along the inner wall surface of the cylinder 20 due to a sudden expansion of the flow path cross section, that is, on the inner wall surface of the flow path. In contrast, flow separation occurs.

  In general, the jet accelerates the external fluid by exchanging momentum with the external fluid, and is entrained inside the jet. At this time, if a wall surface exists in the vicinity of the jet, the jet itself is bent toward the wall surface by the reaction of the attractive force that acts to draw the external fluid into the interior, and the flow again follows the wall surface. That is, the flow is reattached to a part of the inner wall surface of the chamber 25.

  The main flow attached to the inner wall surface of the chamber 25 flows directly toward the jet outlet 26 along the inner wall surface of the chamber 25, and is jetted into the bathtub 4 while being biased to a part of the outlet cross section of the jet outlet 26.

  The flow passage cross section of the jet outlet 26 is larger than that of the flow passage cross-section shrinking portion 23, and the flow is decelerated downstream, that is, a reverse pressure gradient is formed in the chamber 25 where the static pressure increases downstream. Thus, a part of the main flow described above is not ejected from the ejection port 26 and is returned to the upstream side of the chamber 25 as shown by an arrow b in FIG.

As shown in FIG. 10C, the flow returned to the upstream side flows into the stagnation region where the main flow is separated in the vicinity of the channel cross-section suddenly enlarged portion 24, as shown in FIG. 10C. Then, a swirling flow is formed around the central axis C1 in the vicinity of the flow path cross-section suddenly enlarged portion 24, whereby the reattachment position of the main flow with respect to the inner wall surface changes irregularly, and the chamber 25 has an irregularity around the central axis C1. A regular swirling flow is formed. Here, an opening edge portion (circular shape in the illustrated example) of the downstream end opening facing the chamber 25 of the flow path cross-section contracting portion 23 and a substantially rectangular outline of the chamber 25 (that is, four surrounding the periphery of the chamber 25) Since the gap described above exists between the inner wall and the inner wall surface, a space that is wider than the opening diameter of the downstream end of the flow path cross-sectional contraction portion 23 is formed in the stagnation region in the chamber 25. It exists in the whole circumference direction of the downstream end opening, and it is possible to form a swirl flow there.
And since the cross-sectional shape of the chamber 25 including the spout 26 is substantially rectangular as described above, the spread (swelling) of the swirling flow in the short direction is restricted, and as a result, from the spout 26 A jet that reciprocates irregularly in the longitudinal direction is ejected. In the front view on the right side of FIG. 10 (d), the movement trajectory of the position of the jet stream viewed from the front side is schematically represented by a dashed-dotted arrow.

  The channel diameter (d in FIG. 3) of the channel cross-section contraction portion is 8.3 mm, the axial length of the chamber 25 (L in FIG. 3) is 76.6 mm, and the straight pipe portion length of the channel cross-section contraction portion 23 (FIG. 3 (L1) is 3 mm, the longitudinal dimension (D in FIG. 4) in the cross section of the chamber 25 and the spout 26 is 34 mm, the short dimension in the cross section of the chamber 25 and the spout 26 (W in FIG. 4) is 14 mm, The distance (X in FIG. 4) between the opening edge of the downstream end opening facing the chamber 25 in the channel cross-section contraction portion 23 and the long side portion in the cross-sectional outline of the chamber 25 is designed to be 2.85 mm. When the supply flow rate into the nozzle was set to 25 to 45 liters / minute, jetting of a jet that reciprocated in the longitudinal direction of the jet outlet 26 could be confirmed.

  The bather can obtain a massage effect by receiving a reciprocating jet from the jet nozzle 11 on a part of the body such as the waist, back, shoulders, hands, and feet. As described above, by rotating the cylindrical body 20, the longitudinal direction of the jet outlet 26 can be set to be vertical, horizontal, or oblique, and the direction can be set arbitrarily. In this case, if the bather takes a bath in a posture with his back facing the short side bathtub wall 4a to which the nozzle 11 is attached, a jet massage reciprocating along the spine can be received.

  Similarly, in the case where the spout 26 is in the vertical direction, if the bather takes a bath with the sole facing the nozzle 11, the reciprocating movement is performed along the vertical direction of the sole between the tip of the foot and the heel. You can receive a jet massage. Further, in the case where the spout 26 is turned sideways, if the bather takes a bath with the sole facing the nozzle 11 side, it is possible to receive a jet massage reciprocating along the base of the toe.

  Such a massage by a reciprocating jet is thin and strong by a generally well-known bubble bath apparatus, and cannot be obtained by a straight jet jetting straight. Moreover, since the jet realized by this embodiment is thicker and softer than such a linear jet, it is possible to obtain a massage feeling that is close to a hand-fumigation that is not locally strong irritation, Even if you take a bath for a long time, you can relax and relax. Moreover, since the frequency of reciprocating movement is not constant but varies irregularly, a natural massage feeling can be obtained.

  In addition, the jet nozzle 11 according to the present embodiment continues from the flow path cross-section suddenly enlarged portion 24 of the chamber 25 to the jet outlet 26 while the cross-sectional shape remains substantially rectangular, and the fluid itself introduced into the inside is described above. In this way, the recirculation action in the chamber 25 excites the reciprocating movement of the jet flow ejected from the ejection port 26, so that the chamber 25 has a shape with less unevenness, so that it is difficult to be contaminated and maintained. And production is also easy. In addition, a three-way valve for switching the ejection direction is unnecessary, the nozzle structure is simplified, it can be manufactured at low cost, and maintenance is facilitated. Furthermore, since there is no narrow control flow path, there is no worry about clogging.

  In the present embodiment, the cylindrical body 20 surrounding the chamber 25 has a single structure. That is, in a single space (flow path) surrounded by a single cylinder 20, a main flow toward the jet outlet 26 and a reflux flowing in a direction opposite to the main flow are formed, and the jet flows as a reciprocating jet into the bathtub water. Is done. Therefore, the structure is simplified, it can be manufactured at low cost, and maintenance is facilitated. Furthermore, there is no worry about clogging up garbage.

  Further, in this embodiment, the flow path cross-sectional contraction portion 23 that functions as an inlet to the chamber 25 is not formed on the peripheral wall portion of the cylindrical body 20 surrounding the chamber 25, and the upstream side in the axial direction of the chamber 25. Opened at the end. Therefore, the main flow that has flowed into the chamber 25 from the flow path cross-section contraction portion 23 is peeled off from the flow path wall surface by the flow path cross-section rapid enlargement portion 24, and then reattaches to the inner peripheral surface of the chamber 25. And the position of reattachment to the flow channel wall surface (inner peripheral surface of the chamber 25) of the main flow is changed by the circulating flow (return flow) formed in the chamber 25. Thus, since the ejection direction changes, it is possible to obtain a variety of jet stimulation that changes the stimulation location with time.

  A portion of the flowing water introduction portion that extends from the flowing water introduction port to the flow path cross-sectional contraction portion may have a structure in which the flow path diameter is substantially constant and curved. However, as in the above-described embodiment shown in FIG. 2, the flow passage diameter of the flowing water introduction portion 22 is gradually reduced from the upstream end portion toward the flow passage sectional contraction portion 23 which is the downstream end portion, and By matching the downstream end position of the flow path cross-sectional center line C2 of the flowing water introduction part 22 with the central axis C1 of the chamber 25, the protruding length of the curved part can be suppressed compared to the case where the flow path diameter is kept constant, Miniaturization that is advantageous for installation in a limited bathroom space can be achieved.

  Here, the present inventors collide the jet jet from the nozzle 11 according to the present embodiment with an observation body spreading in a planar shape provided at a position 70 mm from the jet outlet 26, and the jet collision portion with respect to the observation body The behavior of the jet flow was examined by photographing with an imaging device from the direction facing the jet port 26 in a visualized state.

  The flow path diameter (d in FIG. 3) of the flow path cross section contraction portion is 8.3 mm, the axial length of the chamber 25 (L in FIG. 3) is 76.8 mm, and the straight pipe length of the flow path cross section contraction portion 23 (FIG. 2 is 3 mm, the longitudinal dimension in the cross section of the chamber 25 and the spout 26 (D in FIG. 4) is 33.8 mm, and the short dimension in the cross section of the chamber 25 and the spout 26 (W in FIG. 4). 13.8 mm, the distance (X in FIG. 4) between the opening edge of the downstream end opening facing the chamber 25 in the flow path cross-sectional contraction portion 23 and the long side portion in the cross-sectional outline of the chamber 25 is 2.75 mm. The supply flow rate into the nozzle was 40 liters / minute.

  The analysis result of the captured image is shown in FIG. Photographing was performed three times, and the results for each are shown in FIGS. 11 (a), (b), and (c).

  FIGS. 11A, 11B, and 11C show the collision in-plane distribution (movement trajectory) with time change of the center position of the jet collision portion with respect to the above-mentioned observation object, and a small circle mark indicates the jet collision with the observation object. Indicates the center position of the part. In these distribution maps, 0 in the x direction on the horizontal axis and the y direction on the vertical axis represents the center of the rectangular outlet 26, the x direction is the longitudinal direction of the rectangular outlet 26, and the y direction is short. Each corresponds to a direction.

  The number of image analysis frames is 600, the time step is 0.01 seconds, and the total analysis time is 6 seconds.

  From the results shown in FIG. 11, in any of the three photographings, the jet flow is slightly displaced in the y direction, that is, the rectangular jet port 26 in the short direction, and greatly in the x direction, that is, the longitudinal direction of the jet port 26. It was confirmed that it was swinging.

  Each of FIGS. 11A, 11B, and 11C is a diagram in which all the 600 frames of image analysis frames are overlapped. FIG. 12 shows, for example, 10 frames in FIG. The movement locus for each is shown. In FIG. 12, the distribution map with “# 10-19” attached to the upper left represents the movement trajectory from the 10th frame to the 19th frame, and the distribution map with “# 15-24” attached to the upper left represents the 15th frame. Represents the movement trajectory from the first frame to the 24th frame, and the meanings of “# number-number” attached to the upper left of the other distribution maps are the same. FIG. 12 shows the movement trajectory divided into 28 steps for every 10 frames from the 10th frame to the 154th frame.

  One frame is sampled every 0.01 seconds, and thus a movement trajectory over 10 frames represents a movement trajectory of 0.1 seconds. In each distribution diagram of FIG. 12, the frame sampling order is indicated by an arrow. For example, in the movement trajectory from the 10th frame to the 19th frame, the 10th frame to the 6th frame move upward in the y direction while moving in the x direction. It moves to the right and then moves to the left in the x direction while moving downward in the y direction until the 19th frame.

  From the result of FIG. 12, it can be seen that the behavior of the jet flow changes irregularly while having a swirling component. Note that the scale ranges in the x direction and y direction in FIGS. 11A, 11B, and 11C are the same, whereas in each distribution chart in FIG. 9, the scale range in the x direction is 80 mm. On the other hand, the scale range in the y direction is 20 mm. Accordingly, in FIG. 12, the movement range in the y direction is shown exaggerated from the actual movement range in the x direction, and actually, as shown in FIGS. 8 (a), (b), and (c). The movement in the y direction is small with respect to the movement in the x direction, and the jet flow is greatly swung in the x direction, that is, the longitudinal direction of the rectangular nozzle 26.

  In addition, the present inventors confirmed the appearance of the vibration amplitude of the jet flow from the x-direction components of the three data in FIGS. 11 (a), 11 (b), and 11 (c). This is because, first, moving average is performed 7 times to reduce noise of each data, then the time-series upper and lower limit peaks are extracted in order and the difference between them is taken, and the value is calculated for the jet flow. The probability density distribution was calculated to obtain the vibration amplitude, and the appearance rate of the vibration amplitude was observed, and the entire probability density distribution was calculated.

  The result is shown in FIG. In the graph of FIG. 13, the dotted line is the result for the data in FIG. 11 (a), the one-dot chain line is the result for FIG. 11 (b), and the two-dot chain line is the result for FIG. 11 (c). The solid line represents the results for the whole of FIGS.

  From the result of FIG. 13, it can be seen that the appearance rate of the jet jet vibration amplitude is substantially broad between 5 and 70 mm, and that the fluctuation range of the jet jet vibration amplitude is not constant but varies irregularly. As a result, coupled with the fact that the frequency of the reciprocating movement is not constant but varies irregularly, a more random and natural massage feeling is obtained, and the bather is not nervous.

  Moreover, the present inventors measured the ejection direction switching period at the ejection port 26 in the ejection jet from the nozzle 11 according to the present embodiment. Specifically, the nozzle 11 made of a transparent resin is used to irradiate laser sheet light from the direction facing the ejection port 26 so as to be parallel to the longitudinal direction of the rectangular sectional structure of the ejection port 26. The image was taken from the side surface in the longitudinal direction by the imaging device. Two-dimensional jet direction switching behavior characteristics were examined by putting tracer particles that can confirm the movement of the water flow into the water, observing images from the imaging device, and counting the number of jet direction switching.

  The flow path diameter (d in FIG. 3) of the flow path cross-section contraction portion 23 is 8.3 mm, the axial length of the chamber 25 (L in FIG. 3) is 76.8 mm, and the straight pipe length of the flow path cross-section contraction portion 23 ( 3 (L1) in FIG. 3 is 3 mm, the longitudinal dimension (D in FIG. 4) in the cross section of the chamber 25 and the spout 26 is 29 mm, and the short dimension in the cross section of the chamber 25 and the spout 26 (W in FIG. 4) is 13. .8 mm, and the distance (X in FIG. 3) between the opening edge of the downstream end opening facing the chamber 25 in the flow path cross-section contracting portion 23 and the long side portion in the cross-sectional outline of the chamber 25 is 2.75 mm Designed respectively, the supply flow rate into the nozzle was 25, 30, 40 and 45 liters / minute.

In FIG. 14, the PQ characteristic graph which shows the relationship between the pressure P of the water supplied in the nozzle 11 and the flow volume Q is shown.
FIG. 15 shows a jet flow direction switching frequency characteristic graph of the nozzle 11.

  From these results, it can be seen that when the supply flow rate is 25 to 45 liters / minute, the jet flow tends to switch in the longitudinal direction of the jet port 26 at a frequency of about 13 to 23 Hz. Note that at a position 70 mm from the jet outlet 26, the jet spreads, slightly meanders and is performed in a relatively narrow range, and the observation object on the surface is an elastic body, so a high frequency component is absorbed. As a result, a frequency in the relatively low frequency region, which is a rhythm close to a massage by human hands, has appeared.

  In FIG. 16, the picked-up image which showed the mode of switching of a jet jet direction is shown. In FIG. 16, the schematic movements of the main flow and the vortex are indicated by virtual fluid lines. From this result, it can be seen that the switching of the position in the vertical direction (longitudinal direction of the rectangular outlet) of the vortex generation point is linked to the switching of the mainstream ejection direction, and further, the ejected jet spreads slightly, You can see how they meander.

  From these results, as a sense of irritation actually given to the bather, the jet vibration is strongly felt in the low frequency region, and it is felt at 13 to 23 Hz in the vibration region where the direction is finely switched. It can be confirmed that a squirting jet that gives the bather a complex and fine stimulus is obtained.

  According to the present embodiment, there is no straight bubble that can provide a feeling of stimulation similar to a jet hand massage while oscillating in the longitudinal direction of the substantially rectangular jet port 26 while having a relatively strong stimulation feeling including bubbles. Jets with different modes, such as reciprocating vibration jets, can be realized by selecting and switching between both modes simply by opening / closing control of the electromagnetic valve 41 using the same nozzle 11 having no moving parts and a simple structure.

  That is, without preparing a dedicated nozzle for each mode, the same common nozzle is used for each mode, and various massages are realized while suppressing an increase in cost and installation space. Furthermore, when bubbles are mixed into the nozzle water, air is self-primed using negative pressure generated in the chamber, and switching between the presence and absence of air is simply performed by the electromagnetic valve 41 provided in the air introduction pipe 43. The air supply system can be easily configured by opening / closing control, and is excellent in terms of cost and installation space.

  FIG. 17 shows another specific example of the air supply system. In this specific example, air is supplied into the nozzle 11 not by self-priming but by using an air compressor 52 connected to an air introduction pipe 51. The air introduction pipe 51 is connected between the air intake 2 a provided in the bathtub rim 2 and the pipe line 8 on the discharge side of the pump 7. The air compressor 52 pressure-feeds air taken from the atmosphere through the air intake port 2a to the pipe line 8, whereby air bubbles are mixed into the pressurized bath water flowing through the pipe line 8 into the nozzle 11, This bubble-mixed flowing water is introduced into the nozzle 11 and a straight jet including bubbles is ejected from the ejection port 26.

  The air introduction pipe 51 on the downstream side of the air compressor 52 is provided with a check valve 53 having a forward direction from the air compressor 52 toward the nozzle 11 so as to prevent backflow of bath water to the air compressor 52 side. ing.

  In this specific example, the air compressor 52 functions as a switching device for the presence or absence of air mixing. When the air compressor 52 is driven, air is sent into the nozzle 11 and a straight jet including bubbles is ejected, and the air compressor 52 is stopped. If it does, air will not be sent in the nozzle 11, but the above-mentioned reciprocating vibration jet which does not contain a bubble will be ejected. By using the air compressor 52, a large amount of air can be forcibly introduced, and a high-flow bubble jet can be achieved. In such a case, the feeling of the reciprocating oscillating jet that does not include bubbles and the degree of change greatly change, and the degree of change can be enjoyed. Further, since the nozzle 11 does not need to be provided with an air introduction mechanism such as an air introduction opening, the configuration is simplified. Also, the number of pipes to be attached can be reduced for the attachment of the nozzle 11, and the attachment becomes easy.

  FIG. 18 shows still another specific example of the air supply system. In this specific example, one end on the upstream side of the air introduction pipe 63 communicates with an air intake port 2 a provided in the bathtub rim 2, and the other end on the downstream side communicates with a pipe line 6 on the suction side of the pump 7.

  On the upstream side of the air introduction pipe 63, an electromagnetic valve 61 that functions as a switching device for the presence or absence of air mixing into the nozzle 11 is provided. The air introduction pipe 63 downstream of the electromagnetic valve 61 is provided with a check valve 62 having a forward direction from the air inlet 2a side toward the pipe line 6 side to the air intake 2a side of the bath water. Backflow is blocked.

  A portion where the air introduction pipe 63 is connected to the pipe line 6 is provided on the downstream side of the pipe line 6 near the suction port of the pump 7, and a negative pressure is generated by the drawing force of the pump 7.

  If the solenoid valve 61 is set to “open”, air is sucked into the pipe line 6 from the atmosphere through the air intake port 2a and the air introduction pipe 63 due to the negative pressure, and mixed into the running water as bubbles. The bubbling mixed water is sucked into the pump 7 and is pumped toward the nozzle 11 via the pipe line 8. As a result, bubble-mixed running water is introduced into the nozzle 11, and a straight jet including bubbles is ejected from the ejection port 26.

  If the solenoid valve 61 is set to “closed”, the air is not self-primed, and thus the above-described reciprocating vibration jet that does not include bubbles is ejected from the ejection port 26 of the nozzle 11.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to them, and various modifications can be made based on the technical idea of the present invention.

  The portion of the jet nozzle that continues from the flowing water inlet to the channel cross-section contraction portion may be curved with the channel diameter remaining substantially constant. However, as in the above-described embodiment shown in FIG. 3, the flow path diameter of the flowing water introduction section 22 is gradually decreased from the upstream end section toward the flow path cross-sectional contraction section 23 which is the downstream end section, and By matching the downstream end position of the flow path cross-sectional center line C2 of the flowing water introduction part 22 with the central axis C1 of the chamber 25, the protruding length of the curved part can be suppressed compared to the case where the flow path diameter is kept constant, Miniaturization that is advantageous for installation in a limited bathroom space can be achieved.

  An air intake 2 a for taking air from the atmosphere into the air introduction pipe 43 is provided on the bathtub rim 2. Thereby, even if bathtub water is stored to the full in a bathtub, the air intake 2a is not immersed in bathtub water, and the uptake | capture of air is not prevented. On the other hand, it is not good to take in the air in the closed space under the bathtub rim. This is because the air in the closed space under the bathtub rim is stagnant. In addition, if comprised like this embodiment, in order to take in the air ventilated in the bathroom, the air is fresh and clean.

  Here, the present inventors ejected a jet jet in a state of taking in air from the nozzle 11 according to the present embodiment into water having a depth of 100 mm from the jet outlet 26, and a noise meter NA-27 (manufactured by RION). ) Was separated from the nozzle 11 by a horizontal distance of 500 mm, and the sound level was set to LAeq, 1/3 octave, FAST, measurement time 20 seconds, and the noise level of the jet was checked.

  19A, 19B, 19C, and 19D are cross-sectional views of the cylindrical body 20 taken along the line BB in FIG. 3, the flow path diameter (d in FIG. 4) of the flow path cross-section contraction portion 23 is 8.3 mm, the axial length of the chamber 25 (L in FIG. 3) is 76.8 mm, and the straight pipe length of the flow path cross-section contraction portion 23. (L1 in FIG. 4) is 3 mm, the longitudinal dimension (D in FIG. 4) in the cross section of the chamber 25 and the spout 26 is 33.8 mm, and the short dimension in the cross section of the chamber 25 and the spout 26 (in FIG. 4). W) is 13.8 mm, and the distance (X in FIG. 4) between the opening edge of the downstream end opening facing the chamber 25 in the flow path cross-section contracting portion 23 and the long side portion in the cross-sectional outline of the chamber 25 2.75 mm, inner diameter of air inlet 35 φ6 mm, and chamber air inlet 37 with a diameter of 3 mm as a comparison of the difference in area, the difference between upstream and downstream can be confirmed when there are 6 and 9 holes. Four chambers 25 arranged as described above were designed and manufactured. Here, FIG. 19A shows six chamber air inlets 37 each having a diameter of 3 mm, which are arranged on the upstream side of the central axis C3 in the longitudinal direction of the chamber 25 in FIG. 19B, six φ3 mm diameters of the chamber air inlet 37 are arranged downstream of the longitudinal axis C3 of the chamber 25 in FIG. 19B with the center axis C1 of the chamber 25 as the center. In FIG. 19C, nine φ3 mm diameters of the chamber air inlet 37 are arranged upstream of the central axis C3 in the longitudinal direction of the chamber 25 in FIG. 19C with the center axis C1 of the chamber 25 as the center. 19D shows that the chamber air inlet 37 has nine diameters of 3 mm in diameter with the center axis C1 of the chamber 25 as the center, and the chamber in FIG. Than the longitudinal middle axis C3 of the 5 shows the case of arranging the downstream side. These cylinders 20 in FIGS. 19A, 19B, 19C, and 19D were replaced in the nozzle 11 to perform noise measurement. The supply flow rate into the nozzle 11 during noise measurement was set to 35, 40, and 45 liters / minute.

Here, the chamber air inlet 35 is made constant with a cross-sectional area (3 ² × π≈28 mm ² ) having an inner diameter of φ6 mm, and the chamber air inlet 37 has an opening area (1.5 mm × 6 mm). ² × π × 6≈42 mm ² ) and the chamber air inlet φ3 mm × 9 opening areas (1.5 ² × π × 9≈64 mm ² ).

FIG. 20 shows the noise measurement results of different flow rates in which the cylindrical body 20 of the nozzle 11 is replaced in FIGS. 19 (a) and 19 (b).

From the result of FIG. 20, the noise reduction effect by arranging the chamber air inlets 37 (φ3 × 6) on the downstream side at each flow rate was confirmed.

FIG. 21 shows the noise measurement results of different flow rates in which the cylindrical body 20 of the nozzle 11 is replaced in FIGS. 19 (c) and 19 (d).

From the result of FIG. 21, the noise reduction effect by arranging the chamber air inlet 37 (φ3 × 9) on the downstream side at each flow rate was confirmed.

  20 and 21, when the opening area of the chamber air introduction port 37 is constant in the plurality of casings 20, noise can be reduced by arranging the chambers on the downstream side. It was confirmed that it was possible regardless of the opening area of the mouth 37 and the flow rate. This result indicates that the flow path is in the vicinity of the flow path cross-sectional contraction portion 23 (upstream side from the central axis C3 in FIG. 19) and in the vicinity of the ejection port 26 (downstream side from the central axis C3 in FIG. 19). Due to the difference in the negative pressure level generated due to the difference between the relatively deviated and fast jet flow velocity distribution in the vicinity of the contraction section 23 and the flow velocity distribution relatively averaged in the chamber 25 in the vicinity of the jet outlet 26, However, it is considered that the noise generated during the bubble jetting of the nozzle 11 can be reduced because the change in the tearing state of the air that occurs when the air is drawn into the water to become bubbles is moderated.

FIG. 22 shows the noise measurement results of different flow rates in which the cylindrical body 20 of the nozzle 11 is replaced in FIGS. 19 (a) and 19 (d).

From the results shown in FIG. 22, when the chamber air inlet 37 has the same arrangement position at each flow rate and there is a difference in the opening area, the larger the opening area of the chamber air inlet 37, the higher the noise reduction effect. I was able to confirm that. As a result, the larger the opening area of the chamber air introduction port 37, the lower the flow rate at each chamber air introduction port 37, and the bubble tearing state change can be moderated. It is thought that the noise that was generated was reduced. That is, if it is assumed that the amount of air entering from the air introduction pipe 43 is constant, the plurality of air suction ports 35 and chamber air introduction ports 37 increase the opening area, and the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Bathtub, 5 ... Inlet, 11 ... Jet nozzle, 20 ... Cylindrical body, 22 ... Flowing water introduction part, 23 ... Channel cross-section contraction part, 24 ... Channel cross-section rapid expansion part, 25 ... Chamber, 26 ... Jet , 30 ... curved portion, 31 ... outer cover, 35 ... air inlet, 36 ... groove, 37 ... chamber air inlet, 41, 61 ... solenoid valve, 43, 51, 63 ... air inlet pipe, 52 ... air compressor

Claims (3)

A bathtub,
A suction port into which the bathtub water that is opened in the bathtub wall of the bathtub and stored in the bathtub is sucked;
A pressurizing device that sucks in, pressurizes, and discharges bath water from the suction port;
A single-layer housing held against the bathtub wall below the overflow edge of the bathtub;
A jet nozzle apparatus comprising: a jet nozzle that jets bathtub water introduced into the casing while changing the jet direction;
The jet nozzle includes a running water introduction part,
A chamber that extends in the axial direction of the housing and is formed inside the housing;
The flowing water introduction part is an upstream end part into which pressurized bath water sent from the pressurizing device is introduced, and
A flow path that is narrower than the upstream end, and a downstream end that communicates with the chamber, and the chamber is provided at the upstream end in the axial direction of the flowing water introduction portion. A flow path cross-section suddenly enlarged portion whose flow cross-section is suddenly enlarged with respect to the downstream end, and
A spout opening at the downstream end in the axial direction and facing the interior of the bathtub;
The cross-sectional shape from the flow path cross-sectional sudden expansion portion to the jet outlet is formed in a substantially rectangular shape,
The downstream end opening facing the chamber at the downstream end of the flow path contraction portion flowing water introduction portion is more than the contour line that forms the cross-sectional shape of the chamber in a front view when the inside of the chamber is viewed from the jet port. Located on the inside, and having a gap between the opening edge of the downstream end opening of the flow path cross-section contracting part flowing water introduction part and the contour line,
In order to take in the atmosphere into the chamber, a first suction port that connects the atmosphere and the chamber outer space portion, and a second suction port that connects the chamber outer space portion and the chamber are formed,
The second suction port is formed in a downstream range from a position obtained by dividing the length in the chamber from the flow path cross-sectional contraction portion flowing water introduction portion to the jet outlet in the chamber into two equal parts. A spouted bath device. The jet bath apparatus according to claim 1, wherein the first suction port and the second suction port include a plurality of holes. The jet bath apparatus according to claim 1, further comprising a switching valve that opens and closes the first suction port.

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