JP2008045698A - Check valve, nozzle unit, and bathtub device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve exhibiting high cut-off performance over a long period of time and easily removed for inspection/repair/replacement. <P>SOLUTION: The check valve 3 comprises a valve element 31 of coin shape made of EPDM and coming in face contact with a blowing body 2 to cut off a water passage. A recess 32 is formed in the back face center part of the valve element 31. A water leakage can be positively prevented because the check valve 3 comes in face contact with the blowing body 2. The check valve 3 is deformed such that the center part moves to the blowing body 2 side, and sucked to the blowing body 2 by the difference between water pressure in the bathtub 11 and atmospheric pressure in the blowing body 2. Close contact of the check valve 3 with the blowing body 2 is thereby improved, and the check valve 3 can be easily removed since it is only placed on the blowing body 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a check valve provided in a cylindrical blow body attached to a bathtub, a nozzle unit in which the check valve is incorporated, and a bathtub device including the nozzle unit.

  FIG. 12 is a longitudinal sectional view showing an example of a conventional ball float type nozzle unit.

  Conventionally, as this type of nozzle unit 100, a metal (or synthetic resin) blow body 200 having a mortar-shaped valve seat surface 200 a is inserted into the floor wall 11 a of the bathtub 11 and attached to the blow foot 600. The ball valve 300 is dropped and brought into contact with the valve seat surface 200a of the blow body 200, and the blow cap 500 is screwed onto the upper side of the blow body 200 (hereinafter referred to as a ball float type nozzle unit 100). Is widely used (see, for example, Patent Document 1).

When hot water is supplied to the bathtub 11, as shown in FIG. 12A, the check valve 300 abuts against the valve seat surface 200a of the blow body 200 to block the water passage. Can dam the hot water. Further, when the air blow operation is performed in this state, as shown in FIG. 12B, the check valve 300 is pushed up by air, and bubbles are blown out from the air blowing hole 520 of the blow cap 500.
JP-A-10-132111

  However, this ball float type nozzle unit 100 has the following disadvantages.

  First, regardless of whether the blow body 200 and the ball valve 300 are made of metal or synthetic resin, the ball valve 300 is in line contact with the valve seat surface 200a of the blow body 200 on the circumference. Therefore, the adhesion of the ball valve 3 to the blow body 200 is low, and there is a risk of water leakage from the gap between the two.

  Second, the spherical ball valve 300 is dropped into the mortar-shaped valve seat surface 200a regardless of whether the blow body 200 and the ball valve 300 are made of metal or synthetic resin. Therefore, it is difficult to pick up the ball valve 300 at the time of maintenance or the like, and it cannot be easily removed and inspected / repaired / replaced.

  Thirdly, when both the blow body 200 and the ball valve 300 are made of metal, it is difficult to completely stop water because of surface accuracy. Moreover, during normal (non-blowing) time, the blow body 200 and the ball valve 300 are always in contact with water above the contact portion between the blow body 200 and the ball valve 300. Therefore, there is a problem with water-stopping from a long-term viewpoint.

  Fourthly, when the blow body 200 and the ball valve 300 are made of synthetic resin, it is difficult to resin-mold a complete sphere, and since the ball valve 300 is light, it takes some time to fit in the water stop position. Therefore, there is a risk of inducing water leakage.

  The present invention has been made in consideration of such problems, and exhibits high water-stopping performance over a long period of time, and can be easily removed, inspected, repaired, and replaced during maintenance, etc. It aims at providing a nozzle unit and a bathtub apparatus.

  In order to achieve the above object, the check valve according to the present invention employs the following means.

  In other words, the invention according to claim 1 is a check valve provided in a cylindrical blow body attached to a bathtub, and can be in surface contact with the exhaust side end surface of the blow body to block the water passage. A coin-shaped valve body is provided, and a concave portion is formed in the center portion on the back surface of the valve body, and a ring portion is protruded from the outer peripheral portion.

  And in invention of Claim 1, the back surface outer periphery of the coin-shaped valve body of a non-return valve makes surface contact in a ring shape with respect to the exhaust-side end surface of the blow body. At that time, the valve body is deformed from the concave portion at the central portion and is adsorbed by the blow body, and the adhesion to the exhaust side end surface by the ring portion at the outer peripheral portion is improved.

  The invention according to claim 2 is characterized in that, in the check valve according to claim 1, a protrusion is formed on the surface of the valve body.

  In the invention according to claim 2, the check valve does not stick to the blow cap when the air blow operation is stopped.

  According to a third aspect of the present invention, in the check valve according to the first or second aspect, a contact stop rod that is loosely inserted into the hole of the blow body is protruded into the concave portion on the back surface of the valve body. .

  In the invention described in claim 3, when the hot water supply is started or the air blow operation is started, the stopper rod touches the hole of the blow body to move up and down, and the valve body of the check valve does not shift or float.

  The nozzle unit according to the present invention employs the following means.

That is, the invention according to claim 4 is a nozzle unit in which a blow body is inserted into a bathtub and attached to a blow foot, a check valve is provided on the blow body, and a blow cap is attached to the blow body, The check valve includes a coin-shaped valve body that can come into surface contact with the exhaust-side end surface of the blow body to block the water passage, and a concave portion is formed in the center of the back surface of the valve body, and a ring is formed on the outer peripheral portion. The portion is projected.

  In the invention according to claim 4, since the coin-shaped valve body of the check valve makes surface contact with the exhaust side end face of the blow body, water leakage is prevented. At that time, due to the pressure difference between the water pressure in the bathtub and the air pressure in the blow body, the valve body is deformed from the recess so that the recess in the center moves toward the blow body, and is adsorbed by the blow body, Close contact with the exhaust side end face to ensure reliable water stop.

  According to a fifth aspect of the present invention, in the nozzle unit according to the fourth aspect, a stopper for restricting the horizontal movement of the check valve is provided on the exhaust side end face of the blow body.

  And in invention of Claim 5, a non-return valve does not shift | deviate largely in a horizontal direction, but water stop operation | movement is performed reliably.

  According to a sixth aspect of the present invention, in the nozzle unit according to the fourth or fifth aspect, a protrusion is formed on the surface of the valve body, and a regulating piece protrudes inside the blow cap.

  In the fifth aspect of the invention, the valve body of the check valve floats when the air blow operation is stopped, and the protrusion of the valve body comes into contact with the restriction piece of the blow cap, so that it does not stick to the blow cap.

  According to a seventh aspect of the present invention, in the nozzle unit according to any one of the fourth to sixth aspects, the touch stop bar protrudes into the recess on the back surface of the valve body, and the touch stop bar is loosely inserted into the hole of the blow body. The ring portion of the valve body is in contact with the exhaust side end surface of the blow body.

  In the invention according to claim 7, since the stop rod is positioned in the hole of the blow body at the start of hot water supply, the ring portion of the valve body comes into surface contact with the exhaust side end face. Further, during the air blow operation, air rises from the loose insertion gap between the hole and the stopper rod, and at the same time, the stopper rod rises while being positioned in the hole, so that the valve body of the check valve does not shift or float.

  The invention according to claim 8 is the nozzle unit according to any one of claims 4 to 7, wherein the screwed state of the blow foot and the blow body and the screwed state of the blow body and the blow cap are mutually It is characterized by a reverse screw relationship.

  In the invention according to claim 8, the blow body is prevented from rotating together with the rotation operation of the blow cap and loosening from the blow foot.

    Furthermore, the bathtub apparatus according to the present invention employs the following means.

  That is, the invention according to claim 9 is characterized by including the nozzle unit according to any one of claims 4 to 8.

  According to the check valve according to claim 1 of the present invention, the outer periphery of the back surface of the coin-shaped valve body of the check valve can be brought into surface contact in a ring shape with respect to the exhaust-side end surface of the blow body. High water stopping performance can be realized. In addition, since the check valve is merely placed on the exhaust-side end face of the blow body, it can be easily removed for inspection, repair, or replacement during maintenance.

  According to the nozzle unit of the fourth aspect of the present invention, the valve body is deformed from the recessed portion so that the recessed portion at the center moves to the blow body side due to the pressure difference between the water pressure in the bathtub and the atmospheric pressure in the blow body. Thus, the adhesion to the exhaust side end face of the ring portion is improved, and the water stoppage of the check valve can be further increased.

  According to the bathtub device of the ninth aspect of the present invention, the nozzle unit with further improved water-stopping capability can be used for the bathtub, and can be used without malfunction during hot water supply start or air blow operation.

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

<First Embodiment>
FIG. 1 is a plan view showing a first embodiment of a bathtub apparatus according to the present invention, FIG. 2 is a piping diagram of the bathtub apparatus shown in FIG. 1, and FIG. 3 shows a first embodiment of a nozzle unit according to the present invention. 4 is a view showing a blow body of the nozzle unit shown in FIG. 3, wherein (a) is a perspective view thereof, (b) is a sectional view thereof, and FIG. 5 is a view of a check valve according to the present invention. It is a figure which shows 1st Embodiment, (a) is the top view, (b) is the front view (half sectional view), (c) is the bottom view, FIG. 6 is the nozzle unit shown in FIG. FIG. 7A is a plan view thereof, FIG. 7B is a sectional view taken along line BB, and FIG. 7A is a longitudinal sectional view showing a flow at the start of the air blowing operation. FIG. 7B is a longitudinal sectional view showing a flow when the air blow operation is stopped.

  As shown in FIGS. 1 and 2, the bathtub device 10 includes a bathtub 11 made of a synthetic resin such as acrylic resin, a hot water supply device 13 for supplying hot water to the bathtub 11 through a hot water supply pipe 18, and a floor wall of the bathtub 11. A plurality of nozzle units 1 attached to 11 a, an air supply pump 14 for supplying air to each nozzle unit 1, and a Tetron (registered trademark) supply for connecting each nozzle unit 1 and the air supply pump 14 An air hose 16, an electromagnetic open / close valve 17 attached in the middle of the air supply hose 16, an air supply device 19 for controlling the drive of the air supply pump 14 and the opening / closing of the open / close valve 17, an operation panel 12, and an operation And a controller 15 that controls various operations based on instructions from the panel 12.

  As shown in FIG. 2, the operation panel 12 is provided with a hot water supply switch 12a, a blow operation switch 12b, an operation stop switch 12c, and the like.

  Further, as shown in FIG. 3, each nozzle unit 1 sandwiches a blow foot 6 for taking in air supplied from an air supply pump 14 via an air supply hose 16, and a floor wall 11 a of a bathtub 11 together with the blow foot 6. The blow body 2 includes a check valve 3 mounted on the blow body 2 so as to be movable up and down, and a blow cap 5 that restricts the movement of the check valve 3.

  Here, as shown in FIG. 3, the blow foot 6 has a cylindrical foot main body 61, and a female screw portion 62 of a right-hand thread is formed at the upper center of the foot main body 61. The blow foot 6 is in a state where the air supply hose 16 is connected to both the left and right sides of the foot main body 61.

  Further, as shown in FIG. 4, the blow body 2 has a cylindrical body main body 21, and a male screw portion 22 of a right-hand thread is formed in the lower portion of the body main body 21. A ring-shaped flange portion 23 is formed on the upper portion of the body main body 21, and a male screw portion 26 of a left-hand thread is formed on the outer periphery of the flange portion 23. Further, an annular stopper 24 having a plurality of holes 24a is provided in a ring shape on the exhaust side end face 27 of the flange portion 23. Further, a hexagonal hole 25 with which a hexagonal wrench (not shown) is engaged is formed at the upper center of the body main body 21, and a round hole 25a is continuously formed following this. As shown in FIG. 3, the blow body 2 is in a state of sandwiching the floor wall 11 a of the bathtub 11 together with the blow foot 6 when the male screw portion 22 is screwed into the female screw portion 62 of the blow foot 6. Yes.

  Further, as shown in FIG. 5, the check valve 3 has a valve body 31 having a coin shape at the top, and the valve body 31 has a recess 32 formed at the center of the back surface thereof. A ring portion 33 that protrudes thicker than the recess 32 protrudes in an annular shape from the outer periphery of the recess 32 of the valve body 31. The ring portion 33 has a width W that can be in surface contact with the exhaust-side end surface 27 to effectively prevent water leakage, and the ring end surface is formed as a smooth surface. Here, the back surface of the valve body 31 means a surface on the blow body 2 side. A plurality of protrusions 35 are formed on the surface of the valve body 31. The protrusion 35 is annularly arranged from the outer peripheral side so as to prevent sticking to the blow cap 5. Here, the surface of the valve body 31 means a surface on the blow cap 5 side. Furthermore, a detent rod 36 is integrally projected downward from the center of the back surface of the valve body 31. As the check valve 3, a material having a hardness that is excellent in water-stopping property at the time of hot water supply or blow operation is preferable, for example, EPDM (ethylene propylene rubber) having a hardness of 50 is selected.

  As shown in FIG. 3, the check valve 3 is positioned by loosely inserting the contact-preventing rod 36 into the hexagonal hole 25 and the round hole 25 a as holes, with a slight space inside the stopper 24. Then, the ring portion 33 comes into surface contact with the exhaust side end surface 27 in an annular manner to block the water passage. An annular gap 37 is formed between the stop rod 36 and the hexagonal hole 25 and the round hole 25 a, so that bubbles can pass through the annular gap 37.

  Further, as shown in FIG. 6, the blow cap 5 has a spherical cap-shaped cap body 51, and a plurality of air blowing holes 52 are formed in the cap body 51 at equal angular intervals (that is, on the circumference). , At intervals of 60 °, and penetrated in the vertical direction. Further, a check valve restricting piece 54 protrudes downward from the inner zenith portion of the cap body 51, and a left-handed female thread portion 53 is formed on the inner periphery of the cap body 51. As shown in FIG. 3, the blow cap 5 is in a state of covering the blow body 2 and the check valve 3 when the female screw portion 53 is screwed into the male screw portion 26 of the blow body 2.

  Since the bathtub device 10 has the above-described configuration, when hot water is supplied to the bathtub 11, the hot water switch 12a of the operation panel 12 is pressed while the bathtub 11 is empty.

  Then, the controller 15 instructs the hot water supply device 13 to perform a hot water supply operation. In response to this instruction, the hot water supply device 13 starts hot water supply from the hot water supply pipe 18 to the bathtub 11. As a result, hot water is supplied to the bathtub 11.

  At this time, since a plurality of air blowing holes 52 are formed through the blow cap 5, the hot water passes through these air blowing holes 52 and flows into the back side of the blow cap 5, that is, the blow body 2 side. However, since the exhaust side end face 27 of the blow body 2 is covered with the ring portion 33 of the check valve 3 and the water passage is blocked, hot water does not flow into the blow body 2. Moreover, since the check valve 3 is in close contact with the blow body 2 as shown in FIG. 3 due to the water pressure in the bathtub 11, water leakage can be reliably prevented.

  When hot water is supplied to the bathtub 11 in this way, the blow operation switch 12b of the operation panel 12 is pressed to perform the air blow operation.

  Then, the controller 15 commands the air supply device 19 to perform an air supply operation. In response to this command, the air supply device 19 drives the air supply pump 14 and opens the open / close valve 17. As a result, air is sequentially supplied from the air supply hose 16 to the plurality of nozzle units 1. That is, the air pushes up the concave portion 32 of the valve body 31 through the annular gap 37 while abutting and pushing up the lower end surface of the detent rod 36. As a result, the ring portion 33 and the exhaust side end surface 27 are separated from each other, so that air passes through the air blowing hole 52 from the hole 24a or the front gap of the stopper 24 from the separated portion and is blown into the hot water.

  At this time, the check valve 3 is restricted from being lifted at a predetermined height by the check valve restricting piece 54 of the blow cap 5 and is prevented from sticking by the projection 35, so that a large atmospheric pressure acts on the blow cap 5. There is no risk of loosening.

  Further, to stop the air blow operation, the operation stop switch 12c of the operation panel 12 is pressed. Then, the controller 15 instructs the air supply device 19 to stop the air supply operation. In response to this command, the air supply device 19 stops the air supply pump 14 that has been driven. As a result, the check valve 3 is deformed so that the central portion moves to the blow body side as shown in FIG. 7B due to the pressure difference between the water pressure in the bathtub 11 and the atmospheric pressure in the blow body 2. Is adsorbed by the blow body 2. Therefore, the adhesion of the check valve 3 to the blow body 2 is further improved.

  At this time, since the stopper 24 is provided around the check valve 3, the check valve 3 does not move greatly in the horizontal direction and can reliably perform the water stop operation.

  Further, since the outer periphery of the check valve 3 is thick due to the presence of the ring portion 33, there is no problem that the surface contact state of the check valve with respect to the blow body 2 is deteriorated by the stop of the air supply pump 14.

  Even if the air blow operation is stopped, the check valve 3 is stuck to the back surface of the blow cap 5 in the past, and there is a risk of water leakage. However, as shown in FIG. 5, since a plurality of protrusions 35 are formed on the surface of the valve body 31, it is possible to prevent the check valve 3 from sticking and hence the occurrence of water leakage. However, even in this case, since the check valve 3 made of EPDM is light, when the hot water supply is started, the check valve 3 is displaced due to the injection of hot water. As a result, hot water enters the blow body 2 from the gap that has been lifted. There remains a risk of inflow. However, as shown in FIG. 5, a contact rod 36 is formed at the center of the back surface of the valve body 31. As shown in FIG. 3, the contact rod 36 is loosely inserted into the blow body 2. It is possible to prevent the valve 3 from being displaced and floated, and hence water leakage. The touch bar 36 may have any shape as long as it is engaged with the blow body 2 and can secure a ventilation path during the air blow operation. For example, as shown in FIG. 10, a short detent rod 36 can be employed. Further, when the check valve 3 can be prevented from being displaced or lifted by other means, it is possible to omit the touch stop rod 36 as shown in FIGS.

  Further, when repairing the nozzle unit 1 during maintenance or the like, the following procedure is used.

  First, the blow cap 5 is removed. For this purpose, a dedicated jig (not shown) is engaged with the air blowing hole 52 of the blow cap 5 and the blow cap 5 is rotated clockwise (clockwise). Then, the blow cap 5 is unlocked from the blow body 2 and removed from the blow body 2. At this time, the blow foot 6 and the blow body 2 are screwed together with a right-hand screw, whereas the blow body 2 and the blow cap 5 are screwed together with a left-hand screw. Therefore, it is possible to prevent the blow body 2 from rotating together with the rotation operation of the blow cap 5 and loosening from the blow foot 6. Therefore, handling of the nozzle unit 1 becomes easy.

  When the blow cap 5 is removed in this way, the check valve 3 appears, so the check valve 3 is removed. At this time, since the check valve 3 is merely placed on the blow body 2, unlike the conventional ball float type nozzle unit 1, the check valve 3 can be easily removed for inspection / repair / replacement. it can.

  Furthermore, when removing the blow body 2, a hexagon wrench (not shown) is engaged with the hexagon hole 25 of the blow body 2, and the blow body 2 is rotated leftward (counterclockwise). Then, the blow body 2 is released from the blow foot 6 by being screwed with the blow foot 6.

  Further, since the check valve 3 is made of EPDM, there is no fear that it will rust like metal and deteriorate over time.

<Another embodiment of the nozzle unit>
FIG. 8 is a perspective view showing a blow body of a second embodiment of the nozzle unit according to the present invention, and FIG. 9 is a perspective view showing a blow body of the third embodiment of the nozzle unit according to the present invention.

  In the above-described embodiment, the case where the annular stopper 24 having the hole 24a is erected on the flange portion 23 of the blow body 2 has been described. However, as shown in FIG. 8, a plurality of arc-shaped stoppers 24 'may be arranged on the circumference. Alternatively, as shown in FIG. 9, the stopper 24 may be omitted and only the exhaust side end face 27 may be used.

<Another embodiment of check valve>
FIG. 10 is a cross-sectional view showing a second embodiment of the check valve according to the present invention, and FIG. 11 is a cross-sectional view showing a third embodiment of the check valve according to the present invention.

As shown in FIG. 10, the touch bar 36 'is configured to be short so that an extraction operation or the like during maintenance can be easily performed. The touch stop rod 36 ′ may have a length reaching the hexagonal hole 25.
As shown in FIG. 11, the check piece 3 including the valve element 31 having no contact stop bar is regulated by the stopper 24 and installed on the exhaust side end surface 27, and the ring portion 33 is in close contact with the ring. At the time of blowing up, the sticking is prevented by the protrusion 35 and the blowing up is restricted by the regulating piece 54.

<Other embodiments>
In the above-described embodiment, the check valve 3 including the valve body 31 made of EPDM has been described. However, the material of the valve body 31 is not limited to EPDM, and materials other than EPDM (for example, nitrile rubber (NBR), fluorinated nitrile rubber (HNBR), fluorine rubber (FKM), butyl rubber (IIR), chloroprene rubber (CR), butadiene rubber (BR), styrene rubber (SBR), natural rubber (NR), etc.) may be used instead.

  Examples of the present invention will be described below.

  Eight prototypes of two EPDM valve bodies having hardnesses of 50 and 70 were manufactured, and the water stoppage during hot water supply and blow operation was compared. As a result, the EPDM valve body having a hardness of 50 showed high water-stopping properties both during hot water supply and during blow operation. On the other hand, the EPDM valve body having a hardness of 70 slightly decreased the water stoppage during hot water supply and blow operation.

  Then, two types of EPDM valve bodies having hardnesses of 45 and 55 were added to make 8 prototypes each, and the water stoppage during hot water supply and blow operation was compared with EPDM valve bodies having a hardness of 50. As a result, the two types of EPDM valve bodies of hardness 45 and 55 were not significantly different from EPDM valve bodies of hardness 50 in water stoppage during hot water supply and blow operation.

  From the above results, it was demonstrated that the EPDM valve body having a hardness in the range of 45 to 55 exhibits high water-stopping properties during hot water supply and blow operation.

  In addition to general households, the present invention includes hotels, inns, sports clubs, fitness clubs, health clubs, esthetic salons, public baths, super public baths, saunas, golf courses, welfare facilities, welfare facilities, hospitals / clinics, pet facilities, schools, It can be applied widely in bathtubs of various facilities such as companies and dormitories.

It is a top view which shows 1st Embodiment of the bathtub apparatus which concerns on this invention. It is a piping diagram of the bathtub apparatus shown in FIG. It is a longitudinal section showing a 1st embodiment of a nozzle unit concerning the present invention. It is a figure which shows the blow body of the nozzle unit shown in FIG. 3, Comprising: (a) is the perspective view, (b) is the sectional drawing. It is a figure which shows 1st Embodiment of the non-return valve which concerns on this invention, Comprising: (a) is the top view, (b) is the front view (half sectional view), (c) is the bottom view. . It is a figure which shows the blow cap of the nozzle unit shown in FIG. 3, Comprising: (a) is the top view, (b) is sectional drawing by the BB line. It is a longitudinal cross-sectional view which shows the flow at the time of an air blow start. It is a longitudinal cross-sectional view which shows the flow at the time of an air blow stop. It is a perspective view which shows the blow body of 2nd Embodiment of the nozzle unit which concerns on this invention. It is a perspective view which shows the blow body of 3rd Embodiment of the nozzle unit which concerns on this invention. It is sectional drawing which shows 2nd Embodiment of the non-return valve which concerns on this invention. It is sectional drawing which shows 3rd Embodiment of the non-return valve which concerns on this invention. It is a longitudinal cross-sectional view which shows an example of the conventional ball float type nozzle unit, (a) is a figure at the time of hot water supply, (b) is a figure at the time of an air blow operation.

Explanation of symbols

1 …… Nozzle unit 2 …… Blow body 21 …… Body body 22 …… Male thread part 23 …… Flange part 24 …… Stopper 25 …… Hexagon hole 26 …… Male thread part 27 …… Exhaust side end face 3 …… Check Valve 31 …… Valve 32 …… Recess 33 …… Ring 34 …… Groove 35 …… Protrusions 36, 36 ′ …… Tacking rod 37 …… Annular gap 5 …… Blow cap 51 …… Cap body 52 …… Air blowout hole 53 …… Female thread part 54 …… Check valve regulating piece 6 …… Blow foot 61 …… Foot body 62 …… Female thread part 10 …… Bath apparatus 11 …… Bathtub 11a …… Floor wall 12 …… Operation panel 13 …… Hot water supply device 14 …… Air supply pump 15 …… Controller 16 …… Air supply hose 17 …… Open / close valve 18 …… Hot water supply pipe 19 …… Air supply device

Claims (9)

A check valve provided in a cylindrical blow body attached to a bathtub,
A coin-shaped valve body that can come into surface contact with the exhaust-side end surface of the blow body to block the water passage, a concave portion is formed in the center of the back surface of the valve body, and a ring portion projects from the outer peripheral portion. A check valve characterized by The check valve according to claim 1,
A check valve characterized in that a protrusion is formed on the surface of the valve body. The check valve according to claim 1 or 2,
A non-return valve, characterized in that a detent rod that loosely inserts into a hole in the blow body protrudes into a recess on the back surface of the valve body. A nozzle unit in which a blow body is inserted into a bathtub and attached to a blow foot, a check valve is provided in the blow body, and a blow cap is attached to the blow body,
The check valve includes a coin-shaped valve body that can come into surface contact with the exhaust-side end surface of the blow body to block the water passage, and a concave portion is formed in the center portion on the back surface of the valve body. A nozzle unit in which a ring portion is projected. The nozzle unit according to claim 4, wherein
A nozzle unit characterized in that a stopper for restricting horizontal movement of the check valve is provided on an exhaust side end face of the blow body. The nozzle unit according to claim 4 or 5,
A nozzle unit characterized in that a protrusion is formed on the surface of the valve body and a regulating piece protrudes inside the blow cap. In the nozzle unit in any one of Claims 4-6,
A nozzle that protrudes into the recess on the back surface of the valve body, the contact bar is loosely inserted into the hole of the blow body, and the ring portion of the valve body is in contact with the exhaust side end surface of the blow body unit. In the nozzle unit in any one of Claims 4-7,
A nozzle unit characterized in that the screwed state of the blow foot and the blow body and the screwed state of the blow body and the blow cap are in a reverse screw relationship with each other.   A bathtub apparatus comprising the nozzle unit according to any one of claims 4 to 8.

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