JP2008136588A - Jet nozzle and jet bathing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet nozzle and a jet bathing device capable of jetting while changing a jetting direction without providing a rotary slide part. <P>SOLUTION: The jet nozzle jets flowing water introduced into a cylindrical body held to a bathtub wall to the inside of a bathtub while changing the jetting direction. The cylindrical body is provided in its inside with: a flowing water introduction part where the flowing water is introduced; a flow path cross section contraction part communicated with the flowing water introduction part more on the downstream side than the flowing water introduction part, where a flow path cross section is reduced relative to the flowing water introduction part; and a chamber communicated with the flow path cross section contraction part more on the downstream side than the flow path cross section contraction part, provided with a flow path cross section sudden enlargement part where the flow path cross section is suddenly enlarged relative to the flow path cross section contraction part on the end part on the upstream side, and provided with a jetting port facing the inside of the bathtub on the end part on the downstream side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a jet nozzle and a jet bath apparatus that jet a jet into a bathtub, and more particularly to a jet nozzle and a jet bath apparatus that jet a jet swirled around a nozzle central axis.

  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.

  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 obtained.

However, since Patent Document 1 is configured to generate a rotating jet by rotating the nozzle body, the structure for rotatably supporting the nozzle body is complicated and cannot be manufactured at low cost. Furthermore, there is a concern that the rotational performance may be deteriorated due to wear of the rotating sliding portion or clogging of dust.
Japanese Patent Laid-Open No. 2001-8998

  The present invention provides a jet nozzle and a jet bath apparatus that can realize jet jetting while changing the jetting direction without providing a rotating sliding portion.

  According to one aspect of the present invention, there is provided a jet nozzle that includes a cylindrical body that is held against a bathtub wall, and that jets flowing water introduced into the cylindrical body into the bathtub while changing a jetting direction. A flowing water introduction portion into which flowing water is introduced, a flow passage cross-section contraction portion that communicates with the flowing water introduction portion at a downstream side of the flowing water introduction portion, and has a reduced flow passage cross section with respect to the flowing water introduction portion, and A channel cross-section contracted portion is provided downstream of the channel cross-section contracted portion, and the channel cross-section contracted portion has a channel cross-section rapidly enlarged portion at the upstream end. And the chamber which has the jet nozzle which faces the inside of the said bathtub in the downstream edge part was provided in the inside of the said cylinder, The jet nozzle characterized by the above-mentioned is provided.

  Further, according to another aspect of the present invention, a bathtub, a suction port that opens into a bathtub wall of the bathtub and is stored in the bathtub, a circulation path that communicates with the suction port, A pressurizing device that is provided in the middle of the circulation path and pressurizes and discharges the bath water sucked from the suction port; and a cylindrical body that is held with respect to the bathtub wall and communicates with the circulation path, A jet nozzle that jets the bathtub water introduced into the inside of the cylindrical body into the bathtub while changing the jetting direction, from the pressurizing device to the inside of the cylindrical body via the circulation path. A flowing water introduction section into which pressurized bathtub water to be sent is introduced, and a flow path cross-section contraction section which communicates with the flowing water introduction section at a downstream side of the flowing water introduction section and whose flow passage section is reduced with respect to the flowing water introduction section. And on the downstream side of the flow path cross-section contraction part, The flow passage cross section is rapidly enlarged with respect to the flow passage cross section contraction portion at the upstream end, and the outlet facing the inside of the bathtub is provided at the downstream end. And a chamber having a jet bath apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the jet nozzle and jet bath apparatus which can implement | achieve a jet jet, changing a jet direction, without providing a rotation sliding part are provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram showing a schematic configuration of the jet bath apparatus according to the embodiment of the present invention.
Drawing 3 is a mimetic diagram which looked at a bathtub from the side in the jet bath device.

  The jet bath device according to the present embodiment includes a bathtub 1, a suction port 5 opened in the bathtub wall 3 b of the bathtub 1, circulation paths 13 and 14 communicating with the suction port 5, and midway in the circulation paths 13 and 14. A pump 7 which is a pressurizing device provided and a jet nozzle 11 held against the bathtub wall 4a are provided.

  As illustrated in FIG. 2, the bathtub 1 includes a pair of long-side bathtub walls 3 a and 3 b facing each other substantially in parallel and a pair of short-side bathtub walls 4 a and 4 b facing each other substantially in parallel.

  The suction port 5 is formed in the long side bathtub wall 3b. When the pump 7 is driven, the bath water (including hot water) stored in the bathtub 1 is sucked into the circulation path 13 through the suction port 5.

  Generally, the bather leans back on one short side bathtub wall (short side bathtub wall 4a in the specific example shown in FIG. 2), and the other short side bathtub wall (in the specific example shown in FIG. 2). In order to bathe in a posture in which the foot is directed to the short side bathtub wall 4b), when the suction port 5 is formed on the short side bathtub wall, the suction port 5 is blocked by the bather's back or sole, and the pump 7 There is a concern that excessive load will be applied. 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. In addition, in the specific example shown in FIG. 2, although the suction inlet 5 was formed in the long side bathtub wall 3b, you may form in the long side bathtub wall 3a.

  One end of the circulation path 13 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 14 is connected to the discharge port of the pump 7, and the other end is connected to the flowing water inlet of the jet nozzle 11. The pump 7 sucks bathtub water into the circulation path 13 from the suction port 5, pressurizes the sucked bathtub water, and discharges it to the circulation path 14 on the downstream side of the pump 7. The pressurized bathtub water discharged from the pump 7 flows into the flowing water inlet of the jet nozzle 11. In order to drain the residual water inside the pump 7 when not in use, the pump 7 is preferably provided above the jet nozzle 11.

  In this specific example, as shown in FIG. 2, two jet nozzles 11 are attached to one short side bathtub wall 4a. The two jet nozzles 11 are provided at substantially the same height for a predetermined distance. A bathtub-side faucet is provided above the other short-side bathtub wall 4b on the opposite side of the one short-side bathtub wall 4a to which the jet nozzle 11 is attached, and in the vicinity of the other short-side bathtub wall 4b. A drain outlet is provided at the bottom of the bathtub. Therefore, the bather normally takes a bath with a posture in which the back is directed to the short side bathtub wall 4a on the side where the jet nozzle 11 is provided.

  FIG. 1 is a schematic cross-sectional view of a jet nozzle 11 according to an embodiment of the present invention.

  The jet nozzle 11 includes a cylindrical body 20 provided with a running water inlet 21 communicating with the circulation path 14 at one end (upstream end) and a jet outlet 26 at the other end (downstream end).

  The cylindrical body 20 is held by the one short side bathtub wall 4a with the ejection port 26 facing the inside of the bathtub 1. The spout 26 faces the other short side bathtub wall 4b. The running water inlet 21 is connected to the circulation path 14 outside the bathtub 1.

  In the cylindrical body 20 between the flowing water inlet 21 and the jet outlet 26, a flowing water introducing portion 22, a channel cross-section contracting portion 23, and a chamber 25 are provided in this order from the upstream side (flowing water inlet 21 side). The flowing water inlet 21 and the jet outlet 26 are in communication with each other.

  The running water introduction part 22 is provided between the running water introduction port 21 and the flow path cross-sectional contraction part 23, and the cross section of the flow path is gradually narrowed from the flowing water introduction port 21 toward the flow path cross-section contraction part 23. . The channel cross-section contraction portion 23 is located at the axial center of the cylindrical body 20, and the channel cross-section is reduced with respect to the running water inlet 21 and the running water introduction portion 22.

  On the downstream side of the channel cross-section contraction portion 23, a channel cross-section rapid expansion portion 24 in which the channel cross-section is rapidly expanded (for example, three times or more rapidly expanded) with respect to the channel cross-section contraction portion 23 is provided at one end ( A chamber 25 is provided at the upstream end). The chamber 25 continues up to the vicinity of the ejection port 26 with the inner diameter of the flow path cross-section suddenly enlarged portion 24.

  The inner wall surface of the chamber 25 extends substantially parallel to the axial center C of the cylindrical body 20 from the flow path cross-section suddenly enlarged portion 24 to the vicinity of the ejection port 26. In the chamber 25, the inner wall surface following the ejection port 26 is an annular inclined surface 28 that is inclined toward the axial center C of the cylindrical body 20. In addition, as shown in FIG. 21, a lip portion 20a connected to the inner peripheral surface of the chamber 25 is provided at the downstream end of the cylindrical body 20, and an inclined surface 28 is provided at the inner peripheral end of the lip portion 20a. May be. Even in this structure, the same effect as that obtained when the inclined surface 28 having the structure shown in FIG. 1 is obtained can be obtained.

  In the chamber 25 in the vicinity of the spout 26, a shield 27 is provided to block a part of the flow path in the chamber 25 that leads to the spout 26.

  4A is a cross-sectional view of the cylindrical body 20 and the chamber 25 in a portion where the shield 27 is provided, and FIG. 4B is a cross-sectional view taken along line AA in FIG.

  The shield 27 is formed in a disc shape, and is provided inside the chamber 25 with its center coinciding with the axial center C of the cylinder 20. The shield 27 does not shield all the flow paths in the chamber 25, and the flow that allows the flow of flowing water from the chamber 25 to the jet outlet 26 is allowed between the shield 27 and the inner wall portion 25 b of the chamber 25. A path 25a is secured.

  The shield 27 is supported with respect to the inner wall portion 25b of the chamber 25 via three rod-shaped support portions 31 provided radially between the shield 27 and the inner wall portion 25b of the chamber 25. One end of the support portion 31 is fitted and fixed inside the shield 27, and the other end is fitted and fixed in a hole formed in the inner wall portion 25 b of the chamber 25. The three support portions 31 are provided around the outer peripheral surface of the shield 27 at equal intervals along the circumferential direction.

  Since the shield 27 receives the pressure (dynamic pressure) of pressurized bathtub water introduced from the flowing water inlet 21 and flowing through the chamber 25 to the outlet 26, it can withstand the pressure when only one support portion 31 is provided. There is a possibility that sufficient strength cannot be obtained and the shield 27 may come off. If only two support portions 31 are provided, the pressure acting on the surface of the shield 27 is non-axisymmetric with respect to the axis C. There is a possibility that the shield 27 rotates due to the influence of the moment around the support portion generated by the distribution. Therefore, it is desirable to provide three or more support portions 31.

  For example, as shown in FIG. 5A and FIG. 5B which is a BB cross-sectional view thereof, four support portions 31 are arranged around the outer peripheral surface of the shield 27 every 90 ° along the circumferential direction. May be provided.

  Further, as shown in FIG. 6A and FIG. 6B, which is a sectional view taken along the line C-C, the support portion 32 may be provided integrally with the shield 27 and the inner wall portion 25 b of the chamber 25.

  As shown in FIG. 7A and FIG. 7B which is a DD cross-sectional view thereof, the cylindrical body 20 and the shielding body 27 are formed integrally, and then the support body 33 is left so as to leave the support portion 33. A flow path 25a that allows the flow of flowing water from the chamber 25 to the jet outlet 26 may be formed by hollowing out the periphery.

  Next, the operation of the jet nozzle and the jet bath apparatus according to the embodiment of the present invention will be described.

  When a bather operates a switch of a controller (not shown) provided in the vicinity of the bathtub 1, the pump 7 is activated, and the bathtub water stored in the bathtub 1 is sucked into the circulation path 13 from the suction port 5. The sucked bathtub water is pressurized by the pump 7 and introduced into the flowing water inlet 21 of the jet nozzle 11 through the circulation path 14. The pressurized bathtub water introduced into the jet nozzle 11 is jetted into the bathtub 1 as a swirling jet whose jet direction is irregularly changed, as will be described below.

  FIGS. 8A to 8D are schematic views for explaining how a swirling jet is formed by the jet nozzle 11.

  The pressurized bathtub water introduced from the flowing water inlet 21 flows in the form of a jet into the chamber 25 through the flowing water introducing portion 22, the channel cross-section contracting portion 23, and the channel cross-section suddenly expanding portion 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 11 due to the rapid expansion of the flow path cross section, that is, against the inner wall surface of the flow path. 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 reattaches to a part of the inner wall surface of the chamber 25 in the circumferential direction.

  The main stream adhering to the inner wall surface of the chamber 25 flows along the inner wall surface of the chamber 25 as it is, flows between the outer peripheral surface of the shield 27 and the inner wall surface of the chamber 25 toward the ejection port 26, and before the ejection port 26 (upstream side). ) And jets into the bathtub 1 from the jet outlet 26 as a jet inclined with respect to the axial center C along the inclined surface 28 formed so as to be inclined toward the axial center of the cylindrical body 11.

  As described above, a main flow (represented by a thick arrow a in FIG. 8A) is formed in the jet nozzle 11.

  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. Furthermore, since the shield 27 is provided in the chamber 25 so as to block a part of the flow path, a part of the main flow described above is not ejected from the ejection port 26, and the arrow b in FIG. As shown by the above, it is returned to the upstream side of the chamber 25.

  As shown in FIG. 8D, 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 sudden expansion portion 24, as shown in FIG. 8C. Then, a swirling flow is formed around the central axis C in the vicinity of the channel cross-section suddenly enlarged portion 24, whereby the reattachment position with respect to the inner wall surface of the main flow changes irregularly in the circumferential direction, and the central axis C A jet swirling around is ejected.

  The state in which the swirling jet is ejected from the ejection nozzle 11 according to the present embodiment in a state where the jet flow is visualized by mixing bubbles into the jet flow is shown in the photographic diagrams of FIGS. As described above, if the pressure in the chamber 25 is lower than the surface of the jet nozzle 26 and the nozzle 11 is attached to a depth that allows the nozzle 11 to be attached to the bathtub 1, a negative pressure is generally generated in the chamber 25. The air can be supplied by providing an air inlet at the position of the chamber wall.

  The bather can obtain a massage effect by receiving a swirling jet ejected from the jet nozzle 11 on a part of the body such as the waist, back, shoulders, hands, and feet. The jet ejected from the jet nozzle 11 is not a thin and strong linear jet, but a thick and soft swirling jet. You can get a massage that feels almost like a hand massage, and you can relax and relax even if you take a bath for a long time. In addition, when a strong straight jet is locally received, it tends to be in a tension state in order to maintain a posture to receive the jet at a desired site, but the swirling jet of this embodiment is soft over a wide range. In order to give a stimulus, it is easy to make the bather relaxed without putting tension on the bather.

  Since the jet ejected from the jet nozzle 11 according to the present embodiment is swirling, even if no bubbles are mixed in, a sense of stimulation sufficient to receive a massage feeling can be obtained. Since there is no mixing of bubbles, the sound generated by jets and the sound generated when bubbles are mixed can be reduced, making it more relaxing in a quiet environment. Of course, as described above, since bubbles can be easily mixed, bubbles may be mixed into the swirling jet according to the present embodiment, and in this case, the swirling force of the jet is higher than the case where bubbles are not mixed. Can weaken and receive a softer feeling of stimulation. Furthermore, it is possible to realize various stimulation feelings by switching whether or not bubbles are mixed or adjusting the amount of bubble mixing.

  Further, in the jet nozzle 11 according to the present embodiment, the fluid itself introduced into the jet nozzle 11 excites the swirling of the jet ejected from the jet outlet 26 by the reflux action in the chamber 25 as described above. Since it is configured, the rotating sliding part as in Patent Document 1 is unnecessary, the nozzle structure is simplified, it can be manufactured at low cost, and maintenance is facilitated. Furthermore, there is no fear of deterioration in turning performance due to wear or dirt clogging at the rotating sliding portion.

  As described above, the static pressure in the chamber 25 is lower than the static pressure of the bathtub water stored in the bathtub 1, and a reverse pressure gradient in which the static pressure increases toward the downstream side is formed inside the chamber 25. Even if the shield 27 is not provided, it is possible to form a reflux that returns a part of the main flow to the upstream side of the chamber 25. However, providing the shield 27 forms a more stable (increased reliability) reflux compared to the reflux formation due to the reverse static pressure gradient (the static pressure increases in the flow direction). The jet swirl is stable.

  Even if the inclined surface 28 is not provided in front (upstream side) of the ejection port 26, a deflected jet flow is realized because the main flow is biased to a part of the circumferential direction of the inner wall of the chamber 25 as described above. By providing the main flow along the inclined surface 28, deflection of the main flow can be promoted, and a wider swirling jet can be easily formed.

  As shown in FIG. 10, the inner diameter of the flowing water introduction portion 42 may be substantially the same from the flowing water introduction port 21 to the flow path cross-sectional contraction portion 43 a. In this case, a partition wall 43 that is substantially perpendicular to the axial center C is provided at the boundary between the flowing water introduction section 42 and the chamber 25, and an orifice is formed in the center of the partition wall 43 to form a flow path cross-section contraction section 43 a. .

  However, as in the above-described embodiment shown in FIG. 1, the flow passage cross section of the flowing water introduction portion 22 is gradually narrowed from the flowing water introduction port 21 toward the flow passage cross section contraction portion 23, so Pressure loss is reduced, and it is not necessary to apply a large pressure during ejection. That is, it is not necessary to make the pump 7 large, and the installation space and cost can be reduced.

  Next, as shown in FIG. 11, the present inventors provided a pressure gauge 45 in the vicinity of the ejection port 26, and measured the pressure of the swirling jet ejected from the ejection port 26. The pressure gauge 45 was provided at a position 30 (mm) away from the ejection port 26 and 10 (mm) above the axial center C.

The dimensions d, D, D _CB , h, D _out , L, and X shown in FIG. 1 in the jet nozzle 11 are designed as follows. The inner diameter d of the flow path cross-section contraction portion 23 is 8.3 (mm), the inner diameter D of the flow path cross-section enlarged portion 24 and the chamber 25 is 27.8 (mm), and the outer diameter D _CB of the shield 27 is 20.9 ( mm), the axial thickness h of the shield 27 = 5.8 (mm), the diameter _Dout = 22.3 (mm) of the spout 26, the length L of the chamber 25 = 76.6 (mm), and the shield Distance X = 10.4 (mm) from the center of the body 27 in the axial direction to the ejection port 26.

  When the jet passes through the measurement point, the measured pressure takes a large value because the dynamic pressure of the jet is taken into account. That is, in the graph in which the horizontal axis represents time and the vertical axis represents the measured value of the pressure gauge 45, a waveform synchronized with the passage of the jet as shown in FIG. 11 is obtained. Since the time fluctuation frequency of this waveform coincides with the frequency that the jet passes, the time change data of the swirling jet pressure measured by the pressure gauge 45 is subjected to a fast Fourier transform (FFT) to obtain the swirling jet. The swirl frequency spectrum of pressure was calculated. The graph is shown in FIG. In FIG. 12, a, b, c, and d represent graphs when the flow rate of the jet flow is set to 30.0, 24.5, 19.8, and 15.1 (liters / minute), respectively.

  From the result of FIG. 12, the swirl frequency of the jet flow is about 1 to 5 Hz, which gives the bather a stimulus similar to human fir massage. In general, in a portion sensitive to a stimulus other than the hand or foot, a swirling jet of approximately up to about 3 Hz can be recognized as a turning stimulus, and if it exceeds 3 Hz, an illusion as a continuous stimulus is likely to occur. Further, since the turning frequency is not constant but varies irregularly, a natural massage feeling is obtained, and it is difficult to give a tense feeling to the bather.

  If the force and area at the moment when the jet flow of the bath water hits a massage part such as a human body are F and ΔS, respectively, the strength of the jet flow felt at the moment when the human body is present can be defined as F / ΔS. When the swirling frequency of the swirling jet is f1, and the ejection is continued at this frequency, the total area S that hits a massage part such as a human body at a time interval of a period (Δt = 1 / f1) that is the reciprocal of the frequency f1 The value S is obtained by integrating ΔS during Δt.

  On the other hand, when a person feels a stimulus through the skin, etc., the receptor that feels the stimulus varies depending on the person and the place where the stimulus is received, but the stimulus is continuously in the range of several Hz to several hundred Hz, or the same as continuous The illusion of receiving a strong stimulus. Therefore, when a stimulus of intensity F / ΔS is moved at a certain moment in a trajectory having a period of Δt (this is referred to as a movement total trajectory S), the person receives the stimulus of strength F / ΔS by the total area S. It creates an illusion. This tendency becomes more prominent as Δt is smaller and starts to be felt from f = 3 Hz, that is, Δt = 0.3 seconds. Therefore, in order to feel a turning stimulus, the turning frequency is desirably 3 Hz or less.

  Next, the flow path (liter / min) and the pressure (MPa) were measured by changing the inner diameter (inlet diameter to the chamber 25) d of the flow path cross-section contraction portion in various ways. The measurement results are shown in FIG. The flow rate is measured with a flow meter provided in the circulation path 14 connected to the downstream side of the pump 7, and the pressure is downstream of the flow meter in the circulation path 14 and before the jet nozzle 11 (upstream side). Measured with a pressure gauge provided in

In FIG. 13, a, b, c, d, e, and f are the inner diameters d of the flow path cross-section contraction parts 4.2, 5.5, 5.5 (orifice) 8.3, 10.0, The graph at the time of setting to 12.0 (mm) is represented. “Orifice” represents the case where the flow path cross-sectional contraction portion 43a shown in FIG. 10 is used, and the other is the flow path cross-section contraction portion 23 shown in FIG. The dimensions D, D _CB , h, D _out , L, and X of other parts are the same as described above.

  From the results of FIG. 13, the pressure in the circulation path 14 before the jet nozzle 11 is smaller, that is, the pressure loss is smaller, when the inner diameter d of the flow path cross-section contraction portion is larger. However, if the inner diameter d of the flow path cross-section contraction is too large, the swirling performance of the jet flow will be reduced. To obtain the desired swirling performance while reducing the pressure loss, the inner diameter d of the flow path cross-section contraction is About 5-12 (mm) is desirable.

  If the flow rate is less than 20 (liters / minute), sufficient irritation is not obtained, and if it is greater than 50 (liters / minute), a large pump is required. Therefore, the flow rate is preferably 20 to 50 (liters / minute).

  The gap between the shield 27 and the inner wall surface of the chamber 25 is preferably within 5 mm so that a child's finger does not enter. Moreover, it is desirable to form the inner peripheral edge of the spout 26 in a curved shape rather than an edge so that it is safe even if a finger is applied.

  The short-sided bathtub is connected to the short-side bathtub so that the spout 26 is located about 3 to 10 mm away from the back and waist of the bather seated on the short-side bathtub wall 4a provided with the jet-nozzle 11 It is desirable to hold it on the wall 4a. If the spout 26 is too close to 3-10 mm with respect to the bather, the whirling feeling of the jet will not be felt, and if it is too far, the jet will diffuse and it will be difficult to obtain sufficient stimulation. Further, the height of the jet nozzle 11 from the bottom surface of the bathtub can be appropriately set within a range in which the jet flow ejected from the jet nozzle 11 does not jump out from the surface of the bathtub water stored in the bathtub 1.

  FIG. 20 shows another specific example of the jet nozzle. The shield 47 in this jet nozzle has a curved surface on the opposite side (upstream side) of the surface facing the jet port 26. By making the surface to which the bathtub water flowing in the chamber 25 hits a curved surface, the collision of foreign substances such as sand contained in the bathtub water against the shield 47 can be mitigated, and the shield 47 can be removed or damaged. Can be prevented.

  The number of suction ports 5 is not limited to one, and a plurality of suction ports may be provided. In addition, if the suction flow rate is large and the diameter of the suction port 5 is not sufficiently large, the water absorption flow rate increases, that is, the pulling force to the suction port 5 increases, and part of the body such as limbs, hair, etc. Since it is easy to be sucked, the diameter and the number of the suction ports 5 are appropriately designed according to the performance of the pump 7 and the flow rate of ejection from the ejection nozzle 11.

  Also, sand or the like may be mixed in the bathtub, and if the flow velocity in the circulation paths 13 and 14 is too high, the sand or the like may collide with the inner wall surface of the pipe and cause damage. It is desirable to design the inner diameter of the circulation path so that the flow velocity is approximately 2 (m / s) or less.

  The pump 7 may be integrally provided on the side of the flowing water inlet 21 of the jet nozzle 11.

  The number of the jet nozzles 11 is not limited to two, and as shown in FIG. 14, one jet nozzle 11 may be provided on the short side bathtub wall 4a. Of course, three or more jet nozzles 11 may be provided.

  In addition, as shown in FIGS. 15 and 16, the pair of long-side bathtub walls 3 a and 3 b are close to the short-side bathtub wall 4 a (the bather who takes a bath with the back facing the short-side bathtub wall 4 a. Each of the jet nozzles 11 may be provided at a position located on the side of the body portion). In the case of FIG. 15, a swirling jet is jetted from the jet nozzle 26 of each jet nozzle 11 toward the leg from the side of the body of the bather. In the case of FIG. 16, each outlet 26 is directed to the longer side bathtub walls 3 a, 3 b facing the longer side bathtub walls 3 a, 3 b on which it is provided, and the length of the bathtub 1 is extended from each outlet 26. A swirling jet is ejected toward the side of the bather substantially perpendicular to the side direction.

  Moreover, as shown in FIG. 17, you may provide the two jet nozzles 51 spaced apart in the bathtub short side direction, for example in the short side bathtub wall 4b to which a bather's leg | foot is directed. The jet nozzle 51 may be a nozzle that ejects a swirling jet similar to the jet nozzle 11 described above, or may be a nozzle that jets a jet straight. The jet nozzle 51a of each jet nozzle 51 opposes the opposite short side bathtub wall 4a, and jets are jetted from the jet outlet 51a toward the soles of the bathers, the lower limbs, the front of the body, and the like.

  The suction port of the pump 7 is connected via the circulation path 13 to, for example, the suction port 5 opened in the long side bathtub wall 3b. The discharge port of the pump 7 is connected to the circulation path 14 and the circulation path 52 via switching means (for example, a three-way valve) 53. The circulation path 14 is connected to the jet nozzle 11 provided in one short side bathtub wall 4a, and the circulation path 52 is connected to the jet nozzle 51 provided in the other short side bathtub wall 4b.

  The switching means 53 selectively switches the supply destination of the pressurized bathtub water discharged from the pump 7 to the circulation path 14 or the circulation path 52. This switching control may be an open / close control in which only one of the circulation paths 14 and 52 is connected to the pump 7, or both the circulation paths 14 and 52 are connected to the pump 7, and the flow rate to both the circulation paths 14 and 52. The ratio variable control may be used.

  When a plurality of jet nozzles 11 and 51 are provided, as shown in FIG. 18, a plurality of systems for supplying bathtub water to each of the jet nozzles 11 and 51 (circulation paths) may be provided.

  For example, two suction ports 5 and 55 are formed in the long side bathtub wall 3b, and one suction port 5 is provided in one short side bathtub wall 4a via the circulation path 13, the pump 7, and the circulation path 14. The other suction port 55 is connected to a jet nozzle 51 provided on the other short side bathtub wall 4b via a circulation path 56, a pump 57, and a circulation path 54.

  Further, even if two circulation systems and two pumps are provided, one suction port 5 may be shared by each system as shown in FIG.

It is a schematic cross section of a jet nozzle concerning an embodiment of the present invention. It is a schematic diagram showing the schematic structure of the jet bath apparatus which concerns on embodiment of this invention. It is the schematic diagram which looked at the bathtub from the side surface direction in the same jet bath apparatus. (A) is sectional drawing of the jet nozzle principal part which concerns on this embodiment, (b) is AA sectional drawing in Fig.4 (a). (A) is sectional drawing of the principal part of the jet nozzle of another specific example, (b) is BB sectional drawing in Fig.5 (a). (A) is sectional drawing of the jet nozzle principal part of another specific example, (b) is CC sectional drawing in Fig.6 (a). (A) is sectional drawing of the jet nozzle principal part of another specific example, (b) is DD sectional drawing in Fig.7 (a). It is a mimetic diagram for explaining signs that a swirling jet is formed with a jet nozzle concerning this embodiment. It is a photograph figure showing a mode that the swirling jet was jetted from the jet nozzle which concerns on this embodiment in the state which mixed the bubble to the jet flow and visualized the jet flow. It is principal part sectional drawing of the jet nozzle which concerns on another specific example. It is a mimetic diagram for explaining the measurement experiment of the pressure of the swirling jet ejected from the jet nozzle by providing a pressure gauge near the jet nozzle of the jet nozzle according to the present embodiment. FIG. 12 is a graph in which a swirl frequency spectrum of swirl jet pressure is calculated by performing fast Fourier transform (FFT) on swirl jet pressure time change data measured by the pressure gauge shown in FIG. 11. The graph figure showing the result of having measured the flow volume (liter / min) and the pressure (MPa) by changing the internal diameter (inlet diameter to the chamber) d of the flow path cross-section contraction part in the jet nozzle concerning this embodiment variously. It is. It is a schematic diagram showing schematic structure of the jet bath apparatus which concerns on another specific example. It is a schematic diagram showing schematic structure of the jet bath apparatus which concerns on another specific example. It is a schematic diagram showing schematic structure of the jet bath apparatus which concerns on another specific example. It is a schematic diagram showing schematic structure of the jet bath apparatus which concerns on another specific example. It is a schematic diagram showing schematic structure of the jet bath apparatus which concerns on another specific example. It is a schematic diagram showing schematic structure of the jet bath apparatus which concerns on another specific example. It is a schematic cross section of the jet nozzle concerning other examples. It is a schematic diagram showing the other specific example of the structure of a chamber downstream end in the jet nozzle which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bathtub, 5 ... Inlet, 11 ... Jet nozzle, 20 ... Cylindrical body, 22 ... Flowing water introduction part, 23 ... Channel cross-section contraction part, 24 ... Channel cross-section rapid expansion part, 25 ... Chamber, 26 ... Jet , 27 ... shielding body, 31 to 33 ... support part

Claims (8)

A jet nozzle that includes a cylindrical body that is held against a bathtub wall, and that jets flowing water introduced into the cylindrical body into the bathtub while changing the jetting direction.
A running water introduction section into which running water is introduced;
A flow path cross-section contracting portion that communicates with the flowing water introduction portion on the downstream side of the flowing water introduction portion, and a flow passage cross-section is reduced with respect to the flowing water introduction portion;
The channel cross-section contracted portion communicates with the channel cross-section contracted portion at the downstream side of the channel cross-section contracted portion, and the channel cross-section suddenly expanded portion with the channel cross-section contracted portion expanded to the upstream end. And a chamber having a jet outlet facing the inside of the bathtub at the downstream end,
Is provided inside the cylindrical body.   2. The jet nozzle according to claim 1, wherein the cylindrical body is held by one short-side bathtub wall of the bathtub, and the jet outlet faces the other short-side bathtub wall.   3. The jet nozzle according to claim 1, wherein a flow passage cross section of the flowing water introduction portion is gradually narrowed toward the flow passage cross-section contraction portion.   4. The apparatus according to claim 1, further comprising a shielding member provided facing the chamber in the vicinity of the ejection port and blocking a part of a flow path leading to the ejection port. Jet nozzle.   The said shielding body is supported with respect to the inner wall part of the said chamber through three or more support parts provided radially between the said shielding body and the inner wall part of the said chamber. Item 5. A jet nozzle according to item 4.   The jet nozzle according to claim 5, wherein the shielding body, the support portion, and the inner wall portion of the chamber are integrally formed.   The jet nozzle according to any one of claims 1 to 6, wherein an inner wall portion following the jet port in the chamber is inclined toward an axial center of the cylindrical body. A bathtub,
A suction port that sucks in the bathtub water that is opened in the bathtub wall of the bathtub and stored in the bathtub;
A circulation path communicating with the suction port;
A pressurizing device that is provided in the middle of the circulation path and pressurizes and discharges the bath water sucked from the suction port;
A jet nozzle that has a cylindrical body that is held with respect to the bathtub wall and communicates with the circulation path, and that jets the bathtub water introduced into the cylindrical body into the bathtub while changing the ejection direction; ,
With
Inside the cylinder,
A flowing water introduction section into which pressurized bathtub water sent from the pressurizing device via the circulation path is introduced;
A flow path cross-section contracting portion that communicates with the flowing water introduction portion on the downstream side of the flowing water introduction portion, and a flow passage cross-section is reduced with respect to the flowing water introduction portion;
The channel cross-section contracted portion communicates with the channel cross-section contracted portion at the downstream side of the channel cross-section contracted portion, and the channel cross-section suddenly expanded portion with the channel cross-section contracted portion expanded to the upstream end. And a chamber having a jet outlet facing the inside of the bathtub at the downstream end,
A jet bath apparatus characterized by the above.