JP2009153908A - Jet bath device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet bath device capable of easily ejecting a reciprocating and vibrating jet stream into bathtub water in a simple structure. <P>SOLUTION: The jet bath device includes a bathtub, an inlet opened on the bathtub wall of the bathtub for sucking bathtub water stored inside the bathtub, a pressurizing device for sucking the bathtub water from the inlet and pressurizing and discharging it, and a jet nozzle held to the bathtub wall facing a jet port 26 inside the bathtub below the overflowing edge of the bathtub, for ejecting pressurized bathtub water introduced from the pressurizing device to the inside from the jet port 26 into the bathtub. The jet nozzle has a conversion part 25 for converting a turning flow to a reciprocating and vibrating jet stream. <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.

  Patent Document 1 discloses a nozzle body in which an outer shape is substantially circular and a jet port provided inside is eccentric from the axial center position and is rotatably accommodated in a unit jet port cover, and water in a bathtub. A nozzle device is disclosed that includes an orifice that injects the nozzle at a predetermined pressure into a jet hole of the nozzle body. Water in the bathtub is injected at a predetermined pressure into the jet hole of the nozzle body through the orifice, mixed with air to become a bubble mixed jet, and jetted into the bathtub from the jet port of the jet hole as a jet jet. At this time, since the jet port of the nozzle body is provided at a position eccentric with respect to the axial center position, the nozzle body is rotated by the jet flow from the orifice, and thereby the rotating jet flow in which the jet direction of the jet jet is changed. Is disclosed.

  According to Patent Document 2, a structure (corresponding to an inner cylinder) having a guide wall on its inner surface that gradually increases the flow path width toward the downstream side, and a structure (corresponding to an outer cylinder) attached to the bathtub wall. There is a disclosure that a swirling flow can be generated with a structure in which a flow path for returning a part of the flowing water flowing downstream to the upstream side is formed as a narrow gap between the inner wall surface and the inner wall surface.

Further, Patent Documents 3 to 5 disclose that a jet that changes a jetting direction so as to vibrate can be obtained with a structure in which a movable part is not provided in the nozzle itself.
JP 2001-008998 A JP-A-2-128765 Japanese Patent Laid-Open No. 4-176461 JP 2006-325992 A German Patent Application No. 4409656

  In swirling jets such as Patent Documents 1 and 2, for example, when performing a jet massage that reciprocates along the vertical direction between the heel and toes on the sole, near the base of the toes, spine, and muscles of the waist Is unsuitable.

  In general, the swirl flow can be obtained relatively easily. However, the reciprocating vibration jet, particularly the nozzle disclosed in Patent Document 3, is a reciprocating vibration jet into the air, and the overflow surface of the bathtub. Since it is disposed above, it is not shown as an oscillation phenomenon in water.

  Further, according to Patent Document 4, the opening ratio of the three-way valve in the pipe is adjusted to change the flow rate ratio, and two fluid collisions are performed by water discharged from the two flow paths below the bathtub water surface. There is a disclosure that a reciprocating vibration jet is used to perform a jet massage along the lymph flow. However, the configuration in which the two fluids collide while changing the flow rate ratio to obtain a reciprocating vibration jet requires a large number of pipes and the opening control of the three-way valve, which is a complicated, expensive and large-scale problem for the system. There is.

  Further, Patent Document 5 discloses a configuration in which a control flow switching channel for reciprocating vibration of the discharged water flow is provided to realize a slow reciprocating vibration jet by a gas-liquid two-phase flow under the bathtub water surface. Yes. 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 eject a reciprocating vibration jet into bathtub water easily with a simple structure.

  According to one aspect of the present invention, a bathtub, an intake port that is opened in the bathtub wall of the bathtub and is stored in the bathtub, and the bathtub water is sucked from the intake port, pressurized, and discharged. And a pressurizing device that is held against the bath wall with the spout facing the inside of the bathtub below the overflow edge of the bathtub, and the pressurized bath water introduced into the interior from the pressurizing device There is provided a jet bath device comprising: a jet nozzle that jets into the bathtub from an outlet, wherein the jet nozzle has a conversion unit that converts a swirling flow into a reciprocating vibration jet.

  ADVANTAGE OF THE INVENTION According to this invention, the jet bath apparatus which can eject a reciprocating vibration jet into bathtub water easily 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 a back, a waist, etc., and the short side bathtub If bathing is performed with the feet facing the wall 4a, the jets from the jet nozzle 11 can be received on the soles of the feet and the calves.

  FIG. 2 is a schematic cross-sectional view of the jet nozzle 11, and FIG. 3 is a front view of the jet nozzle 11 in FIG. FIG. 2 corresponds to the AA cross section in FIG.

  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.

  An upstream end portion in the axial direction of the chamber 25 is provided with a channel cross-section rapid expansion portion 24 whose channel cross-section is rapidly expanded with respect to the channel cross-section contraction portion 23 (for example, the diameter is rapidly expanded three times or more). ing. A substantially rectangular spout 26 opens at the downstream end of the chamber 25 in the axial direction. That is, the upstream end portion in the axial direction in the chamber 25 functions as the flow path cross-sectionally enlarged portion 24, and the downstream end portion in the axial direction in the chamber 25 functions as the ejection port 26.

FIG. 4 is a schematic perspective view showing only the cylindrical body 20 extracted, and shows a state cut in a direction parallel to the longitudinal direction of the substantially rectangular jet port 26.
FIG. 5 is a cross-sectional view of the cylindrical body 20 corresponding to the BB cross section in FIG. 3, and is a cross-sectional view of the cylindrical body 20 cut in a direction parallel to the short direction of the substantially rectangular jet port 26. It is.

  The outer shape of the cylindrical body 20 is cylindrical, but the cross-sectional shape of the chamber 25 formed as a hollow hole therein is substantially circular at the upstream end where the flow path cross-sectional contraction portion 23 is opened, At the downstream end where the spout 26 is opened, it has a substantially rectangular shape similar to the spout 26. The “substantially rectangular shape” here 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. 8 also includes an oval or racetrack shape having a pair of straight lines facing substantially parallel to each other as long sides as shown in FIG.

  The cross-sectional shape of the chamber 25 does not suddenly change from a substantially circular shape to a substantially rectangular shape from the upstream side to the downstream side, but the longitudinal direction of the jet port 26 as the substantially circular shape at the upstream end portion goes downstream. Then, it continues to the substantially rectangular jet port 26 while gradually changing so as to be crushed into a vertically long shape. The chamber inner wall surface 25a that continues to the long side of the spout 26 is a curved surface on the upstream end side, but the outward bulge becomes smaller toward the downstream side, and is flat in the vicinity of the spout 26. ing.

  As shown in FIG. 2, the flow path wall surface from the flow path cross-section contraction portion 23 to the flow path 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.

  A downstream end opening (inlet to the chamber 25) facing the inside of the chamber 25 in the flow path cross-sectional contraction portion 23 is formed in a circular shape, and its center 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 ejection port 26 in a front view when the inside of the chamber 25 is viewed from the ejection port 26.

  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. 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. 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. 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. 6A to 6D 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 a is not ejected from the ejection port 26 and is returned to the upstream side of the chamber 25 as indicated by an arrow b in FIG.

  As shown in FIG. 6C, 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. 6C. 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.

  As described above, the cross-sectional shape of the chamber 25 is substantially rectangular while gradually changing so that the substantially circular shape of the upstream side end portion is crushed into a shape that becomes vertically long in the longitudinal direction of the ejection port 26 toward the downstream side. , The expansion (swelling) of the swirling flow in the short direction of the spout 26 is restricted, and a spout that irregularly reciprocates in the longitudinal direction is ejected from the spout 26. Is done. In the front view on the right side of FIG. 6 (d), the movement trajectory of the position of the jet stream viewed from the front side is schematically represented by a one-dot chain line arrow. That is, the chamber 25 functions as a conversion unit that converts a swirling flow into a reciprocating vibration jet.

  The flow path diameter (d in FIG. 2) of the flow path cross-section contraction is 8.3 mm, the axial length of the chamber 25 (L in FIG. 2) is 76.6 mm, and the longitudinal dimension of the ejection port 26 (D in FIG. 3). 34 mm, the lateral dimension (W in FIG. 3) of the jet outlet 26 is 14 mm, 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 of the jet outlet 26 When the distance between them (X in FIG. 3) is designed to be 2.85 mm, and the supply flow rate into the nozzle is 25 to 45 liters / minute, the jet flow that reciprocates in the longitudinal direction of the nozzle 26 Was confirmed.

  In the present embodiment, a reciprocating vibration jet can be easily realized by first generating a swirl flow that can be easily formed as a water flow and then converting the swirl flow into a reciprocating vibration jet. Further, the cross-sectional shape of the chamber 25 is not abruptly changed from a substantially circular shape advantageous for the formation of a swirling flow to a substantially rectangular shape of the ejection port 26, but is gradually changed. Conversion to a jet can be performed smoothly, and fluid energy loss such as pressure loss can be suppressed.

  The bather can obtain a massage effect by receiving a reciprocating vibration jet ejected 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. In addition, compared to such a straight jet, the jet realized by the present embodiment is relatively thick and soft without bubbles in accordance with the substantially rectangular shape of the jet outlet 26, so that a locally strong stimulation is not caused. You can get a massage that is almost like a firty hand massage, so you can relax and relax even if you take a bath for a long time.

  Further, the jet nozzle 11 according to the present embodiment has a configuration in which the fluid itself introduced therein excites the reciprocating movement of the jet jetted from the jet outlet 26 by the recirculation action in the chamber 25 as described above. Therefore, a rotating sliding part is unnecessary, the nozzle structure is simplified, it can be manufactured at a low cost, and maintenance is facilitated. Furthermore, there is no worry about wear or dust clogging at the rotating sliding part.

  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.

  Note that 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 be curved with the flow path diameter being substantially constant. 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.

  Moreover, in this embodiment, the input system of the flowing water with respect to one nozzle is one system, and the patent document 4, 5 does not require two input flow paths, a three-way valve, a control means of a control flow, etc. , The system is simple, there is no clogging, and the cost and maintenance are excellent. 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 shape of the chamber is not limited to the above-described one, and a flow path cross-sectional contraction portion 123 is opened like the chamber 125 shown in FIG. The cross section from the upstream side end portion where the cross-section suddenly enlarged portion 124 is provided to the downstream side end portion where the jet port 126 is opened may be formed in the same substantially rectangular shape as the jet port 126.

  The chamber 125 also functions as a conversion unit that converts the swirl flow into a reciprocating vibration jet. That is, when the pressurized bath water flows into the chamber 125 from the flow path cross-section contracting portion 123, the flow cross-section is suddenly expanded, so that the flow separation occurs on the flow path wall surface and the external fluid is drawn into the interior. The reaction of the attracting force acting in this manner causes the jet itself to bend toward the wall surface, so that the flow again follows the channel wall surface, and the flow reattaches to a part of the channel wall surface.

  The flow passage cross section of the jet outlet 126 is larger than that of the flow passage cross-sectional contraction portion 123, and the flow is decelerated toward the downstream, that is, a reverse pressure gradient is formed in the chamber 125 where the static pressure increases toward the downstream. Thus, a part of the mainstream is returned to the upstream side. The return flow flows into the stagnation region where the main flow is separated in the vicinity of the channel cross-section sudden expansion portion 124, so that a swirl flow is formed in the vicinity of the channel cross-section rapid expansion portion 124, thereby reattaching the main flow to the inner wall surface. The position changes irregularly, and an irregular swirling flow is formed in the chamber 125.

  And since the cross-sectional shape of the chamber 125 is formed in the substantially rectangular shape same as the jet nozzle 126, the expansion (swelling) of the swirling flow in the short direction of the jet nozzle 126 is regulated, and the longitudinal direction from the jet nozzle 126 is its longitudinal direction. A jet that reciprocates irregularly in the direction is ejected.

  Moreover, as shown in FIG. 10, it is good also as a structure which formed the chamber 225 as a cylindrical space inside the circular cylinder 220. FIG. A flow path cross-sectional contraction portion 223 opens at the center of the upstream end surface in the axial direction of the cylindrical body 220, and a substantially rectangular jet port 226 opens at the downstream end face of the cylindrical body 220 in the axial direction.

  The cross-sectional shape of the chamber 225 is such that the downstream end where the jet port 226 is formed from the upstream end that functions as the flow path cross-section suddenly enlarged portion with respect to the flow path cross-section shrinking portion 223. A circular shape with a substantially constant diameter is formed.

  The chamber 225 also functions as a conversion unit that converts a swirl flow into a reciprocating vibration jet. That is, when the pressurized bath water flows into the chamber 225 from the flow path cross-section contraction part 223, the flow cross-section is separated from the flow path wall due to a sudden expansion of the flow path cross-section, and an external fluid is drawn into the interior. The reaction of the attracting force acting in this manner causes the jet itself to bend toward the wall surface, so that the flow again follows the channel wall surface, and the flow reattaches to a part of the channel wall surface.

  The flow passage cross section of the jet outlet 226 is larger than the flow passage cross-section contraction part 223, and the flow is decelerated downstream, that is, a reverse pressure gradient is formed in the chamber 225 in which the static pressure increases downstream. Thus, a part of the mainstream is returned to the upstream side. The return flow flows into the stagnation area where the main flow is separated in the vicinity of the upstream-side channel cross-section sudden expansion portion, so that a swirl flow is formed in that portion, and the reattachment position of the main flow to the inner wall surface is irregular. And a flow swirling irregularly is formed in the chamber 225.

  And since the jet nozzle 226 is formed in a substantially rectangular shape, the swirlability is lost when the jet nozzle 226 passes (the spread of the swirling flow is restricted), and a jet stream that reciprocates irregularly from the jet nozzle 226. Erupted.

  FIG. 11 is a photograph showing a state in which a nozzle using the cylindrical body 220 shown in FIG. 10 was produced and a jet ejection experiment was performed. In FIG. 11, the direction penetrating the paper surface is the direction along the longitudinal direction of the jet port, and the horizontal direction is the direction along the short direction of the jet port. The arrow in the figure indicates the jetting direction. FIG. 11A shows a state in which a jet is ejected in a direction inclined rightward with respect to the cylinder axis direction, and FIG. 11B shows the case of FIG. 11A with respect to the cylinder axis direction. On the contrary, it shows a state in which a jet is ejected in a direction inclined to the left. That is, in the configuration using the cylindrical body 220 and the chamber 225 of FIG. 10, a reciprocating vibration jet that sways in the short direction of the substantially rectangular jet outlet 226 was obtained.

  Further, the jet flow ejected from the ejection port 226 is scattered in a short direction of the ejection port 226 over a relatively wide range, and this is because the flow path wall surface from the inside of the chamber 225 to the ejection port 226 suddenly changes substantially at a right angle. This is considered to be a factor.

  In the above-described embodiment, a structure in which a chamber formed in a single-layered cylinder without a movable part functions as a swirl flow forming unit that generates a swirl flow or as a conversion unit that converts swirl flow into a reciprocating vibration jet flow. Although demonstrated, you may implement | achieve a swirl | flow flow formation part and the conversion part to a reciprocating vibration jet by another structure.

  FIG. 12 shows a nozzle body 60 that functions as a swirl flow forming portion. 12A is a schematic cross-sectional view of the nozzle body 60, and FIG. 12B is a view of the downstream end portion of the nozzle body 60 as viewed from the front side. In addition, the cross section of Fig.12 (a) is CC cross section in FIG.12 (b).

  The nozzle body 60 has a mechanically movable portion for forming a swirl flow. A cylindrical rotating body 62 is accommodated inside the cylindrical body 61 as the mechanically movable portion. The downstream end of the cylindrical body 61 is opened, and a bearing holding member 64 extending in the diametrical direction is provided at the open end. A bearing 68 is provided at the center of the bearing holding member 64, and one end of the rotating shaft 63 is supported by the bearing 68. The other end of the rotating shaft 63 is supported by a bearing 67 provided at the center of the upstream end of the cylindrical body 61. The rotating shaft 63 extends parallel to the axial direction of the cylindrical body 61 and the rotating body 62 and is provided at the axial center position thereof. The rotating body 62 is rotatable around the rotating shaft 63 inside the cylindrical body 61. It has become.

  The rotating body 62 is formed with a jet hole 65 penetrating from the upstream end face to the downstream end face. The jet hole 65 is provided at a position deviated from the rotation shaft 63, and the center of the inlet 65b and the center of the outlet 65a of the jet hole 65 are in the circumferential direction of the rotating surface of the rotator 62 as shown in FIG. The axial direction of the jet hole 65 is inclined with respect to the rotation shaft 63 so as to be displaced. Further, the axial direction of the jet hole 65 is inclined so as to be separated from the rotary shaft 63 radially outward as it goes from the upstream side to the downstream side.

  When pressurized bathtub water from the pump is introduced into the cylindrical body 61 on the upstream side of the rotating body 62, the bathtub water passes through the jet holes 65 and is ejected from the outlet 65a. Here, the axial direction of the jet hole 65 is inclined with respect to the rotary shaft 63 so that the inlet 65 b and the outlet 65 a which are both ends of the jet hole 65 in the axial direction are displaced in the circumferential direction of the rotating surface of the rotating body 62. Therefore, the water flow flowing through the jet hole 65 has a tangential component of the rotating surface of the rotating body 62, and the rotating body 62 is rotated by the reaction force of the water flow. By the rotation of the rotating body 62, the outlet 65a is also moved in the circumferential direction around the rotating shaft 63, whereby a jet swirled from the outlet 65a is ejected.

  As shown in FIG. 13, a conversion unit 70 is provided on the downstream side of the nozzle body 60 that ejects the swirl flow.

  The conversion unit 70 has a shape obtained by cutting off the top of the quadrangular pyramid, and surrounds the space on the downstream side of the nozzle body 60 with the four side surfaces of the trapezoidal shape with the bottom part facing the downstream end surface of the nozzle body 60. It is out. The outlet 65a of the jet hole 65 faces the space surrounded by the conversion unit 70, and a swirling flow is jetted from the outlet 65a of the jet hole 65 into the space.

  A substantially rectangular jet 71 is formed at the downstream end of the conversion unit 70, and the swirling flow jetted into the conversion unit 70 loses swirlability when passing through the jet 71 (spreading swirl spread). And a reciprocating oscillating jet that swings in the longitudinal direction is ejected from the spout 71 toward the inside of the bathtub.

  FIG. 14 shows another specific example of the conversion unit combined with the nozzle body 60. The conversion unit 80 has an upstream end formed in a substantially circular shape in accordance with the turning, and a substantially rectangular jet port 81 is formed in the downstream end, and the cross-sectional area gradually becomes larger than that of the conversion unit 70 in FIG. Since it is narrowed, the conversion from the swirl flow to the reciprocating vibration flow tends to smoothly transition.

  Also in this conversion unit 80, a substantially rectangular jet port 81 is formed at the downstream end, and the swirling flow jetted into the conversion unit 80 passes through the channel and the jet port 81 having a substantially rectangular cross section. Sometimes, the swirlability is lost (the spread of the swirl flow is restricted), and a reciprocating vibration jet that swings in the longitudinal direction is ejected from the jet port 81 toward the inside of the bathtub.

  Also in these specific examples, a reciprocating vibration jet can be easily realized by first generating a swirl flow that can be easily formed as a water flow and then converting the swirl flow into a reciprocating vibration jet.

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 model perspective view which shows the longitudinal cross-section of the cylinder of the jet nozzle. The cross-sectional view corresponding to the BB cross section in FIG. 3 of the cylinder of the jet nozzle. The schematic diagram for demonstrating the behavior of the flowing water 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 which shows the other specific example of the chamber shape in the jet nozzle which concerns on embodiment of this invention. The schematic diagram which shows the other specific example of the chamber shape in the jet nozzle which concerns on embodiment of this invention. The photograph figure which shows a mode that a jet is ejected from the nozzle which has the chamber structure of FIG. The schematic diagram which shows the nozzle main body which functions as a swirl flow formation part in the jet nozzle which concerns on other embodiment of this invention by making a swirl flow formation part and the conversion part which converts a swirl flow into a reciprocating vibration jet flow into another structure. The schematic diagram which shows the state which combined the conversion part with respect to the nozzle main body of FIG. The schematic diagram which shows the state which combined the conversion part of a form different from FIG. 13 with respect to the nozzle main body of FIG.

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

Claims (3)

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;
Below the overflow edge of the bathtub, the outlet is faced into the bathtub and held against the bathtub wall, and the pressurized bathtub water introduced from the pressurizing device into the bathtub is introduced into the bathtub A jet nozzle for jetting,
The jet nozzle includes a conversion unit that converts a swirl flow into a reciprocating vibration jet. The jet nozzle has a single-layered cylinder,
The conversion part is a chamber formed in the cylinder extending in the axial direction of the cylinder,
In the chamber, an inlet of flowing water is opened at an upstream end in the axial direction, and a rapidly expanding section of the flow path section is provided in which the flow path cross section is rapidly expanded with respect to the inlet, and the downstream end in the axial direction is provided. The jet bath apparatus according to claim 1, wherein the substantially rectangular jet port is opened.   The jet bath apparatus according to claim 2, wherein a cross-sectional area of the chamber gradually decreases from the inlet toward the jet outlet.