JP2009172367A - Jet bath apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet bath apparatus having a simple constitution and capable of jetting out jet flow reciprocatingly and self-excitedly vibrating into bathtub water. <P>SOLUTION: A jet nozzle has a running water introduction part and a chamber. The running water introduction part has an upstream-side end portion for introducing the pressurized bathtub water, and a downstream-side end portion having a narrowed channel with respect to the upstream-side end portion and communicated with the chamber. The chamber has a channel cross section sudden-expansion part provided at an axial upstream-side end portion and having the channel cross section suddenly expanded with respect to the downstream-side end portion of the running water introduction part, and a jet outlet opened to the axial downstream-side end portion. The downstream end opening whose cross section from the channel cross section sudden-expansion part to the jet outlet is formed into a substantially rectangular shape and which faces the chamber in the downstream-side end portion of the running water introduction part is positioned inside the profile line of the chamber in front view when observing the chamber from the jet outlet. A clearance is formed between the opening edge portion of the downstream end opening of the running water introduction part and the profile line. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a jet bath apparatus including a jet nozzle that jets a jet into a bathtub.

  Conventionally, there are jet nozzles provided on the bathtub wall, and jets are jetted from the nozzles into the bathtub, but most of them jet jets straight, and jets are part of the bather's body. It was difficult to get a variety of massage feelings because the stimulation received locally by the jet was monotonous and easy to get bored.

Further, Patent Documents 1 to 3 disclose a configuration in which a jet flow can be ejected while changing the ejection direction in a structure in which a movable portion is not provided in the nozzle itself.
Japanese Patent Laid-Open No. 4-176461 JP 2006-325992 A German Patent Application No. 4409656

  Patent Document 1 discloses that an oscillation phenomenon of a jet is caused by the action of a fluid itself in a nozzle. However, in Patent Document 1, the nozzle is used when water is discharged into the air. As will be described later, in experiments conducted by the inventors using a nozzle imitating the nozzle disclosed in Patent Document 1, When water was discharged into the water, no jet oscillation phenomenon (switching of the jet direction) was confirmed. Therefore, in the one disclosed in Patent Document 1, it is impossible to apply a variegated jet to the waist, legs, soles, toes, etc. of a bather immersed in bath water.

  According to Patent Document 2, the flow rate ratio is changed by adjusting the opening degree of the three-way valve in the pipe, and two fluids collide with water discharged from the two flow paths under the bathtub water surface, and reciprocating with a gas-liquid two-phase flow. There is a disclosure that an oscillating jet is used to perform a jet massage along the lymph flow. However, the configuration in which reciprocating vibration jets are obtained by colliding while changing the flow rate ratio with two fluids requires a large number of pipes and the opening control of the three-way valve, which makes the system complicated, expensive, and large There is.

  Patent Document 3 discloses a configuration in which a control flow switching flow path for reciprocating vibration of a discharged water flow is provided to realize a slow reciprocating vibration jet by a gas-liquid two-phase flow below the bathtub water surface. However, also in this case, a control flow for causing the jet flow to reciprocate is necessary, and a thin pipe for flowing the control flow is required, complicating the system, and the thin pipe is clogged with dust and the like. There is a concern that the operation cannot be obtained.

  This invention is made in view of the above-mentioned problem, and provides the jet bath apparatus which can jet the jet which carries out a reciprocating self-excited vibration in bathtub water with a simple structure.

  According to one aspect of the present invention, a bathtub, a suction port into which bathtub water opened in the bathtub wall of the bathtub and stored in the bathtub is sucked, and bathtub water is sucked from the suction port, pressurized and discharged. And a single-layered tubular body that is held against the bathtub wall below the overflow edge of the bathtub, and changes the jet direction of the bathtub water introduced into the tubular body. A jet bath device comprising a jet nozzle that spouts into the bathtub while the jet nozzle extends in the axial direction of the running water introduction portion and the cylindrical body and is formed inside the cylindrical body The flowing water introduction section has an upstream end into which pressurized bath water sent from the pressurizing device is introduced, and a flow path is made narrower than the upstream end. And a downstream end communicating with the chamber, the chamber having a front end A channel cross-section abruptly enlarged portion provided at an axial upstream end portion and having a flow channel cross-section enlarged rapidly with respect to the downstream end portion of the flowing water introduction portion, and an opening in the axial downstream end portion. A chamber at the downstream end of the flowing water introduction portion, wherein the chamber is formed in a substantially rectangular shape from the flow channel cross-section suddenly enlarged portion to the jet outlet. The downstream end opening facing inside is located inside the contour line of the chamber in a front view when the inside of the chamber is viewed from the jet port, and the opening edge portion of the downstream end opening and the contour line of the flowing water introduction portion There is provided a jet bath apparatus characterized by being a jet bath apparatus characterized in that a gap exists between the two.

  ADVANTAGE OF THE INVENTION According to this invention, the jet bath apparatus which can eject the jet flow which carries out a reciprocating self-excited oscillation in bathtub water with a simple structure is provided.

  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 4, the suction port 5 opened in the bathtub wall of the bathtub 4, 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 4 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 bathtub water (including hot water) stored in the bathtub 4 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. 2 is a schematic cross-sectional view of the jet nozzle 11.
FIG. 3 is a front view of the jet nozzle 11 in FIG. 2 as 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. 3, an annular flange portion 34 having a circular through hole 34 a is formed at the central portion of 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 with the jet nozzle 26 facing the inside of the bathtub 4 below the overflow edge of the bathtub 4. Here, the “overflow edge” means the edge (or rim) of the bathtub 4 that overflows from the inside of the bathtub 4 when the bathtub water is accumulated in the bathtub 4. Due to such a configuration, it is possible to reliably jet the jet flow from the jet nozzle 11 into the bath water in a state where bath water is stored in the bath 4 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. As a result, cavitation is less likely to occur and cavitation noise can be reduced.

  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 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. 6 also includes an oval or race track 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 suddenly enlarged portion 24 as 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. 3, and between the opening edge and the outline. There is a gap in the front view.

  In FIG. 2, the outer cover 31 is held and fixed with respect to the bathtub wall, and the cylindrical body 20 provided inside thereof is rotatable about the central axis C <b> 1 with respect to the outer cover 31. As shown in FIG. 3, the jet outlet 26 is opened 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. While holding these two recesses 38 with a finger, the cylinder 20 in FIG. 2 can be rotated with respect to the outer cover 31, and the rotation of the cylinder 20 allows the longitudinal direction of the spout 26 to be arbitrarily set. The direction can be set. In FIG. 3, 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.

  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, the above-described pump 7 is activated, and the bathtub water stored in the bathtub 4 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 introducing portion 22 of the jet nozzle 11 through the circulation path 8.

  Here, the diagrams shown on the left side in FIGS. 7A to 7D are schematic diagrams for explaining the behavior of running water in the chamber 25. A front view is shown. 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 the flow passage cross-section contraction 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. 7C, 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. 7C. 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 is irregular 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 reciprocally moves back and forth in the longitudinal direction is ejected. In the front view on the right side of FIG. 7 (d), the movement trajectory of the position of the jet stream viewed from the front side is schematically represented by an arrow of a one-dot chain line.

  The flow path diameter (d in FIG. 2) of the flow path cross-sectional contraction portion is 8.3 mm, the axial length of the chamber 25 (L in FIG. 2) is 76.6 mm, and the longitudinal dimension in the cross section of the chamber 25 and the ejection port 26 ( In FIG. 3, D) is 34 mm, the transverse dimension (W in FIG. 3) is 14 mm in the cross section of the chamber 25 and the jet nozzle 26, and the opening edge of the downstream end opening facing the chamber 25 in the flow path cross section shrinking portion 23 When the distance (X in FIG. 3) between the long sides of the cross-sectional outline of the chamber 25 is designed to be 2.85 mm and the supply flow rate into the nozzle is 25 to 45 liters / minute, It was confirmed that a jet flow that reciprocates in the longitudinal direction of the outlet 26 was swung.

  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 channel diameter (d in FIG. 2) of the channel cross-section contraction is 8.3 mm, the axial length of the chamber 25 (L in FIG. 2) is 76.8 mm, and the straight pipe length of the channel cross-section contraction 23 (FIG. 2 is 3 mm, the longitudinal dimension (D in FIG. 3) 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 (W in FIG. 3). 13.8 mm, the distance (X in FIG. 3) 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. 8 (a), (b), and (c).

  FIGS. 8A, 8B, and 8C show the collision in-plane distribution (movement trajectory) with time change of the center position of the jet collision portion with respect to the 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. 8, in any of the three shootings, the jet flow is slightly displaced in the y direction, that is, the rectangular jet port 26 in the short direction, and large in the x direction, ie, the longitudinal direction of the jet port 26. It was confirmed that it was swinging.

  FIGS. 8A, 8B, and 8C are diagrams in which all the 600 frames of image analysis frames are overlapped. FIG. 9 shows, for example, 10 frames in FIG. 8A. The movement locus for each is shown. In FIG. 9, 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. 9 shows the movement trajectory divided into 28 steps 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. 9, 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. 9, it can be seen that the behavior of the jet flow changes irregularly while having a swirling component. The scale ranges in the x and y directions in FIGS. 8 (a), 8 (b), and 8 (c) 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. Therefore, in FIG. 9, 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. 8 (a), 8 (b), and 8 (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. 14, the dotted line is the result for the data of FIG. 8A, the one-dot chain line is the result for FIG. 8B, and the two-dot chain line is the result for FIG. 8C. A solid line is a result about the whole of Drawing 8 (a)-(c).

  From the result of FIG. 14, 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 width 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 is performed by putting tracer particles that can confirm the movement of the water flow into the water, observing an image by an imaging device as shown in FIG. 17, and counting the number of jet direction changes visually. The behavior characteristics were investigated.

  The channel diameter (d in FIG. 2) of the channel cross-section contraction portion 23 is 8.3 mm, the axial length of the chamber 25 (L in FIG. 2) is 76.8 mm, and the length of the straight pipe portion of the channel cross-section contraction portion 23 ( 2 (L1) in FIG. 2 is 3 mm, the longitudinal dimension (D in FIG. 3) 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. 3) 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.

FIG. 15 shows a PQ characteristic graph showing the relationship between the pressure P of the water supplied into the nozzle 11 and the flow rate Q.
FIG. 16 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. 17, the picked-up image which showed the mode of switching of a jet jet direction is shown. In FIG. 17, 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.

  Further, the present inventors variously changed the shape and size of the downstream end opening facing the chamber 25 in the flow path cross-section contracting portion 23, and further changed the cross-sectional shape and size of the chamber 25 and the ejection port 26, and FIG. Imaging and analysis similar to the results obtained in a), (b), and (c) were performed. The results are shown in FIGS.

  The axial length (L in FIG. 2) of the chamber 25 is designed to be 76.8 mm, and the length of the straight pipe portion (L1 in FIG. 2) of the flow path cross-sectional contraction portion 23 is 3 mm. L / min.

  In the sample shown in FIG. 10a-1, the cross-sectional shape of the flow path cross-section contraction portion is circular, the flow path diameter d is 8.3 mm, the cross-sectional shape of the chamber and the jet port is rectangular, and the longitudinal dimension A is 33. .8 mm, and the lateral dimension B was set to 13.8 mm. That is, the sample shown in FIG. 10a-1 is the same sample as the case where the results of FIGS. 8A, 8B, and 8C were obtained, and the analysis by three times of the imaging of FIG. 10A-1 is performed. Results FIGS. 10a-2, a-3, and a-4 are the same as FIGS. 8A, 8B, and 8C, respectively. In addition, about all the samples including this FIG. 10a-1, the flow path center of the flow path cross-sectional contraction part, the central axis of the chamber, and the center position of the jet outlet are made to coincide.

  The sample shown in FIG. 10 b-1 is the same as FIG. 10 a-1 except that the four corners in the rectangular cross-sectional shape of the chamber and the spout are rounded. 10b-2, b-3, and b-4 show the analysis results of the three imaging operations for FIG. 10b-1.

  In the sample shown in FIG. 10 c-1, the cross-sectional shape and flow path diameter d of the flow path cross-sectional contraction portion are the same as those in FIG. 10 a-1, but the longitudinal dimension A in the rectangular cross-sectional shape of the chamber and the spout is 23. 8 mm and the lateral dimension B were 9.8 mm. 10c-2, c-3, and c-4 show the analysis results of the three times of imaging for FIG. 10c-1.

  In the sample shown in FIG. 11 a-1, the rectangular cross-sectional shape of the chamber and the spout and the dimensions A and B thereof are the same as those in FIG. 13.8 mm, which is the same as the dimension B in the short direction in the rectangular cross-sectional shape of the chamber and the jet nozzle. FIG. 11a-2, a-3, and a-4 show the analysis results of the three imaging operations for FIG. 11a-1.

  In the sample shown in FIG. 11b-1, the rectangular cross-sectional shape of the chamber and the spout and the dimensions A and B thereof are the same as those in FIG. Was a 13.8 mm square. FIG. 11 b-2, b-3, and b-4 show the analysis results of the three imaging operations for FIG. 11 b-1.

  In the sample shown in FIG. 11 c-1, the rectangular cross-sectional shape of the chamber and the spout and the dimensions A and B thereof are the same as those in FIG. 10 a-1, but the cross-sectional shape of the flow path cross-sectional contraction portion is rectangular. The long side portion in the rectangular shape extends in the longitudinal direction of the rectangular cross-sectional shape of the chamber and the spout, the length a is 13.8 mm, and the short side portion is a rectangular cross-section of the chamber and the spout. It extends in the short direction of the shape, and its length b is 8.3 mm. The analysis results of the three shootings for FIG. 11c-1 are shown in FIGS. 11c-2, c-3, and c-4.

  In the sample shown in FIG. 12 a-1, the rectangular cross-sectional shape of the chamber and the spout and the dimensions A and B thereof are the same as those in FIG. 10 a-1, and the cross-sectional shape of the flow path cross-sectional contraction portion is rectangular. The long side in the rectangular shape extends in the short direction of the rectangular cross-sectional shape of the chamber and the spout, the length a is 13.8 mm, and the short side is the rectangular shape of the chamber and the spout It extends in the longitudinal direction of the cross-sectional shape, and its length b is 8.3 mm. FIGS. 12a-2, a-3, and a-4 show the analysis results of the three shootings for FIG. 12a-1.

  In the sample shown in FIG. 12 b-1, the rectangular cross-sectional shape of the chamber and the spout and the dimensions A and B thereof are the same as those in FIG. 10 a-1, and the cross-sectional shape of the flow path cross-sectional contraction portion is rectangular. The long side portion in the rectangular shape extends in the longitudinal direction of the rectangular cross-sectional shape of the chamber and the spout, the length a is 13.8 mm, and the short side portion is a rectangular cross-section of the chamber and the spout. It extends in the short direction of the shape, and its length b is 3.75 mm. 12b-2, b-3, and b-4 show the analysis results of the three imaging operations for FIG. 12b-1.

  In the sample shown in FIG. 12 c-1, the rectangular cross-sectional shape of the chamber and the spout and the dimensions A and B thereof are the same as those in FIG. 10 a-1, and the cross-sectional shape of the flow path cross-sectional contraction portion is rectangular. The long side in the rectangular shape extends in the short direction of the rectangular cross-sectional shape of the chamber and the spout, the length a is 13.8 mm, and the short side is the rectangular shape of the chamber and the spout It extends in the longitudinal direction of the cross-sectional shape, and its length b is 3.75 mm. 12C-2, c-3, and c-4 show the analysis results of the three shootings for FIG. 12c-1.

  10 to 12, the downstream end opening of the flow path cross-sectional contraction portion extends to the same size as the short-side dimension of the cross section of the chamber and the jet outlet, the opening edge of the downstream end opening, the chamber, In the case where there is no gap between the outline forming the cross-sectional shape of the jet outlet (FIGS. 11a-1, 11b-1, 12a-1, and 12c-1), the jet movement range in the x direction and the y direction The jet movement range is almost the same, and it is impossible to feel a jet that fluctuates greatly in the x direction, that is, the longitudinal direction of the jet outlet, resulting in a local jet jet.

  On the other hand, the downstream end opening of the channel cross-section contraction is located inside the contour that forms the cross-sectional shape of the chamber and the jet outlet, and the contour and the opening of the downstream end opening of the channel cross-section contraction In the configuration in which a gap exists between the edges, a moving range in the x direction is larger than a moving range in the y direction, and thus a jet flow that swings greatly in the longitudinal direction of the jet port is obtained.

  In addition, Patent Document 1 discloses a nozzle that can realize an intermittent jet flow by oscillation, but the present inventors have shown a nozzle imitating this in FIGS. 13 (a) and 13 (b). It was created as shown in the photograph of Fig. 1, and the jet behavior in air and water was visually confirmed. The results are shown in Table 1. The state of the jet behavior into the air at a supply flow rate of 20 liters / minute is shown in the photograph of FIG. 13 (c), and the state of the jet flow into the air at a supply flow rate of 50 liters / minute is shown in FIG. 13 (d). It is shown in the photograph figure.

  “Switching number” in Table 1 indicates that the jet ejection direction is tilted to the left and right with respect to the direction from, for example, a state in which the jet is ejected straight upward (nozzle axis direction) in FIGS. It was counted once each time it changed direction or changed from the direction tilted to the left and right in the nozzle axis direction.

  From this experimental result, it was confirmed that the ejection direction was switched except for the flow rate of 10 liters / minute. However, the switching was unstable several times, and if it was switched in a short cycle, it would not switch for a while. And the squirting direction did not change during the eruption into the water.

  Therefore, the structure disclosed in Patent Document 1 realizes a jet that sways in a certain direction when sprayed into the air and bathed in a neck that is not immersed in the bath water as shown in FIG. Although it may be possible, it becomes a jet stimulus that is poor in local and straight change for the part immersed in the bath water.

  Moreover, in this embodiment, the input system of the flowing water with respect to one nozzle is one system, and it does not require two input flow paths, a three-way valve, the control means of a control flow, etc. like patent documents 2 and 3. , Simplify the system, and excel in cost and maintainability. That is, according to the present embodiment, the jet flow that is oscillated in a reciprocating manner can be ejected into the bath water with a simple structure, thereby realizing a rich massage feeling.

The schematic diagram which shows schematic structure of 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 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). In the jet nozzle according to the present embodiment, the shape and dimensions of the downstream end opening of the flow path cross-section contracting portion and the cross-sectional shapes and dimensions of the chamber and the jet outlet are variously changed, and (a), (b), and (c) of FIG. The schematic diagram which shows the result of having image | photographed and analyzed similarly to having obtained the result of. In the jet nozzle according to the present embodiment, the shape and dimensions of the downstream end opening of the flow path cross-section contracting portion and the cross-sectional shapes and dimensions of the chamber and the jet outlet are variously changed, and (a), (b), and (c) of FIG. The schematic diagram which shows the result of having image | photographed and analyzed similarly to having obtained the result of. In the jet nozzle according to the present embodiment, the shape and dimensions of the downstream end opening of the flow path cross-section contracting portion and the cross-sectional shapes and dimensions of the chamber and the jet outlet are variously changed, and (a), (b), and (c) of FIG. The schematic diagram which shows the result of having image | photographed and analyzed similarly to having obtained the result of. The photograph which shows the mode of the jet flow behavior from the nozzle which imitated the nozzle disclosed by patent document 1, and the nozzle in the air or water. The graph which shows the appearance rate of the ejection jet vibration amplitude in the jet nozzle which concerns on this embodiment. The graph which shows the PQ characteristic of the pressure P and the flow volume Q in the jet nozzle which concerns on this embodiment. The graph which shows the jet jet direction switching frequency characteristic in the jet nozzle which concerns on this embodiment. The image which shows the mode of the switching of the jet ejection direction in the jet nozzle which concerns on this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 4 ... Bathtub, 5 ... Suction port, 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 ... Spout 30 ... curved portion, 31 ... outer cover

Claims (2)

A bathtub,
A suction port into which 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;
It has a single-layered tubular body held against the bathtub wall below the overflow edge of the bathtub, and the bathtub water introduced into the tubular body is placed inside the bathtub while changing the ejection direction. A jet bath device comprising a jet nozzle for jetting,
The jet nozzle has a running water introduction part, and a chamber that extends in the axial direction of the cylinder and is formed inside the cylinder,
The flowing water introduction section includes an upstream end to which pressurized bath water sent from the pressurizing device is introduced, and a downstream end having a narrow channel with respect to the upstream end and communicating with the chamber. And
The chamber is provided at an upstream end portion in the axial direction and has a flow path cross-sectional suddenly enlarged portion with respect to the downstream end portion of the flowing water introduction portion, and a downstream side in the axial direction. A spout opening at the end and facing the inside of the bathtub, and a cross-sectional shape from the flow path 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 flowing water introduction part is located inside the contour line of the chamber in a front view when the inside of the chamber is viewed from the jet port, and the flowing water introduction part There is a gap between the opening edge of the downstream end opening and the contour line.   The jet bath apparatus according to claim 1, wherein the chamber is rotatable about an axial direction of the cylindrical body.