JP4925265B2 - Suction cover mounting structure for circulation pump - Google Patents

Description

  The present invention relates to a structure for attaching a suction cover of a circulation pump used in a bubble generating bathtub.

  Conventionally, Patent Literature 1 discloses a bubble generating bathtub (jet bath) in which bathtub water is circulated by a circulation pump and ejected from an injection port provided inside the bathtub.

  As shown in FIG. 12, the bubble generating bathtub found in Patent Document 1 is provided with an inlet 53 for bathing water in the bathtub 1 so as to face the back and soles of the bather, and the inlet 53 In addition, a circulating pump 2 is known. In the vicinity of the suction port 53, an injection port 3 for injecting a jet of bubbles is provided. Moreover, the air inlet 50 and the operation switch 51 are provided in the flange part of the bathtub 1 in the bubble generation bathtub. The air suction port 50 is connected to the injection port 3, and the operation switch 51 is electrically connected to the control unit 52 together with the circulation pump 2. When the operation switch 51 is operated at the time of bathing, the circulation pump 2 is activated according to the operation signal, and the hot water in the bathtub 1 is sucked from the suction port 53 and sprayed from the spray port 3. At that time, the air taken in from the air suction port 50 is mixed as bubbles, and a jet of bubbles is ejected into the bathtub 1. A massage effect can be obtained by applying this jet to the waist or feet of the bather.

  In the above conventional bubble generating bathtub, as shown in FIG. 13, the circulation pump 2 is arranged on the bathtub outer side M, and the suction cylinder portion 2a protruding from the circulation pump 2 is passed through the opening 4 provided in the bathtub wall 1a. The circulation pump 2 is attached to the bathtub wall 1a by projecting it to N and screwing the pump tightening nut 6 from the inner side N of the bathtub to a screw part provided on the outer peripheral surface of the suction cylinder part 2a. Further, the front surface of the suction cylinder portion 2 a is covered with a suction cover 7. A substantially slit-like suction hole 60 is opened on the front and side surfaces of the suction cover 7, and bath water is taken into the circulation pump 2 from the suction hole 60 when the bubble generating bath is in operation.

Here, as a conventional method of attaching the suction cover 7, two grooves 54 (FIG. 14) are formed inside the suction cylinder portion 2 a, and on the other hand, the suction cover 7 can be inserted into the groove 54. projecting the two projections 55 (FIG. 15), by rotating the suction cover 7 in the circumferential direction in a state where each protrusion 55 is inserted into the groove 54, locking the suction cover 7 with respect to the suction tube portion 2a I try to let them.

In the conventional method in which the suction cover 7 is directly attached to the suction cylinder portion 2a of the circulation pump 2, as shown by the phantom line in FIG. 13, when the thickness D of the bathtub wall 1a varies, the suction cover 7 is attached. become unable. That is, when the thickness D of the bathtub wall 1a is increased, the suction cover 7 is moved to the bathtub inner side N by a dimension d corresponding to the thickness ΔD of the bathtub wall 1a to be the attachment position P in FIG. In this case, since the projection 55 of the suction cover 7 does not reach the groove 54 of the suction cylinder portion 2a, the suction cover 7 cannot be attached. Therefore, conventionally, it is necessary to prepare a plurality of types of circulation pumps 2 having different formation positions of the grooves 54 of the suction tube portion 2a according to the type of the thickness D of the bathtub 1, and the like, enough for the bathtub 1 having various thicknesses D. There was a problem that it was not possible to cope with.
JP-A-8-215267

  The present invention has been invented in view of the above-described conventional problems, and it is possible to attach the suction cover to the suction cylinder portion of the circulation pump without being influenced by the thickness of the bathtub wall. The purpose is to provide a suction cover mounting structure for circulation pumps that can accommodate bathtubs of various thicknesses, and the durability of the click feeling when attaching the suction cover and the durability of attaching and detaching are extended longer than before. An object of the present invention is to provide a suction pump mounting structure for a circulation pump.

  In order to solve the above-mentioned problems, the present invention provides a circulation pump used in a bubble generation bathtub in which bathtub water is circulated by a circulation pump 2 and ejected from an injection port 3 provided in the bathtub inner side N. The suction cylinder part 2a protrudes from 2, the suction cylinder part 2a protrudes into the bathtub inner side N through the opening 4 provided in the bathtub wall 1a, and the screw part 5 provided on the outer peripheral surface of the suction cylinder part 2a The circulation pump 2 is fixed to the bathtub wall 1a by fastening the pump clamping nut 6 from N, and the front surface of the suction cylinder portion 2a is covered with the suction cover 7 from the bathtub inner side N, and the outer peripheral surface of the pump clamping nut 6 An attachment means 8 for detachably attaching the suction cover 7 to the pump clamping nut 6 is provided on a surface opposite to the inner peripheral surface 7a of the suction cover 7a.

  With this configuration, the suction cover 7 is not directly attached to the suction cylinder portion 2a of the circulation pump 2, but is attached to the pump tightening nut 6 that is screwed into the suction cylinder portion 2a. Even if the thickness D of the bathtub wall 1a increases, the position of the pump clamping nut 6 only moves to the bathtub inner side N by the thickness ΔD of the bathtub wall 1a, and depends on the thickness D of the bathtub wall 1a. The suction cover 7 can be attached at a position away from the bathtub inner wall 1b.

The attachment means 8 includes a fitting protrusion 8a that protrudes inward from a part of the inner peripheral surface 7a of the suction cover 7, and the outer peripheral face 6a of the pump tightening nut 6 while the fitting protrusion 8a is fitted. A substantially L-shaped fitting in which an axial groove 8b1 extending in the axial direction A and a circumferential groove 8b2 extending from the back of the axial groove 8b1 toward the circumferential direction B of the pump tightening nut 6 are integrally formed. It is characterized in Rukoto such from the groove 8b. With such a configuration, by performing a rotation of the pushing and the circumferential direction B in the axial direction A of the suction cover 7 with respect to the pump fastening nut 6 in this order, the fitting projection 8a of the suction cover 7 The suction cover 7 can be attached at a position away from the bathtub inner wall 1b without being influenced by the thickness D of the bathtub wall 1a, and can be locked in the substantially L-shaped fitting groove 8b of the pump clamping nut 6. It becomes.

  Further, the fitting projection 8a of the suction cover 7 and the fitting groove 8b of the pump tightening nut 6 are equally arranged at 90 ° in the circumferential direction B, and the four fitting parts of the pump tightening nut 6 are fitted. In the groove 8b, it is preferable to project the nut-side projections 23 over which the fitting projections 8a get over when the suction cover 7 is finally fitted to the groove bottom portion 42 of the circumferential groove 8b2, and in this case, the fitting projections of the suction cover 7 are provided. 8a and the fitting groove 8b of the pump tightening nut 6 are equally arranged at 90 ° in the circumferential direction B, respectively, so that when the fitting protrusion 8a gets over the nut side protrusion 23, it is fitted from the nut side protrusion 23. The contact pressure applied to the protrusion 8a is distributed to the other fitting protrusions 8a, so that the fitting protrusion 8a can be prevented from being scraped or cracked as much as possible. As a result, when the fitting protrusion 8a gets over the nut-side protrusion 23, Long click feeling Can be maintained over time.

  Further, of the nut-side protrusions 23 provided in the four fitted grooves 8b equally divided at 90 ° in the circumferential direction, any one of the nut-side protrusions 23a protrudes from the groove bottom 42. The height T is formed to be higher than the protruding height t of the other three nut-side protrusions 23b, or one protrusion of the two nut-side protrusions 23, 23 facing the diameter direction of the pump tightening nut 6. It is preferable to form the height T higher than the other protruding height t. In this case, the protruding height T of one or two adjacent nut-side protrusions 23a among the four nut-side protrusions 23 is set as the height T. By making it higher than the protruding height t of the other nut-side protrusion 23b, the four nut-side protrusions 23 have an asymmetric shape. Therefore, when the suction cover 7 is opened / closed / removed, main contact is made between the fitting protrusion 8a and the nut-side protrusion 23a having a high protrusion height t so that a click feeling can be obtained at the time of final fitting. At this time, a gap w is generated between the nut-side protrusion 23b having a low protrusion height t and the fitting protrusion 8a, and the suction cover 7 is rattled by the gap w. The shaving of the fitting protrusion 8a that makes contact is distributed to the other fitting protrusions 8a. Therefore, the fitting protrusion 8a can be prevented from being scraped or cracked, and the durability of the suction cover 7 can be extended significantly (for example, up to four times) than before.

Further, the projecting height T is higher nut side projection 23a of the circumferential groove 8b inlet side corners R1 facing the inlet side b of 2, the circumferential groove 8b 2 of the back side facing the b back side corner portion R2 Are preferably chamfered, and the curvature of the entrance side corner R1 is preferably set to be larger than the curvature of the back side corner R2. In this case, when the suction cover 7 is finally fitted, the suction cover is fitted. The protrusion 8a can easily get over the large-curvature entrance-side corner R1 of the nut-side protrusion 23a, and after getting over, the back-side corner R2 with a small curvature is difficult to return. As a result, the suction cover 7 can be easily fitted into the pump clamping nut 6 and is difficult to come off, so that the suction cover 7 can be prevented from rotating and easily coming off due to a bather's foot hitting. it can.

  In addition, it is preferable to form the inlet 9 of the axial groove 8b1 in the fitting groove 8b of the suction cover 7 so as to be wider than the back part 10. In this case, the attachment of the suction cover 7 to the pump tightening nut 6 is started. Sometimes, the fitting protrusion 8a of the suction cover 7 can be smoothly inserted from the wide entrance 9 of the axial groove 8b1, and the attachment work of the suction cover 7 becomes easy.

Moreover, in order to solve the said subject, this invention has arrange | positioned in the bathtub outer side M in the circulation pump used for the bubble generation bathtub which circulates bathtub water with the circulation pump 2, and ejects it from the injection nozzle 3 provided in the bathtub inner side N. A suction cylinder portion 2a is projected from the circulation pump 2, and the suction cylinder portion 2a is protruded into the bathtub inner side N through the opening 4 provided in the bathtub wall 1a, and the screw portion 5 provided on the outer peripheral surface of the suction cylinder portion 2a. By fastening the pump tightening nut 6 from the bathtub inner side N, the circulation pump 2 is fixed to the bathtub wall 1a, and the front surface of the suction cylinder part 2a is covered with the suction cover 7 from the bathtub inner side N, and the pump tightening nut 6 An attachment means 8 for detachably attaching the suction cover 7 to the pump tightening nut 6 is provided on a surface facing the outer peripheral surface 6a and the inner peripheral surface 7a of the suction cover 7, and the attachment means 8 includes the suction cover. 7 inner peripheral surface 7a An annular sealing surface 11 formed is fitted on the outer peripheral surface 6a of the pump fastening nut 6 is characterized in that it consists of O-shaped sealing ring 12 which the annular sealing surface 11 is fit press fit. With this configuration, the suction cover 7 is not directly attached to the suction cylinder portion 2a of the circulation pump 2, but is attached to the pump tightening nut 6 that is screwed into the suction cylinder portion 2a. Even if the thickness D of the bathtub wall 1a increases, the position of the pump clamping nut 6 only moves to the bathtub inner side N by the thickness ΔD of the bathtub wall 1a, and depends on the thickness D of the bathtub wall 1a. The suction cover 7 can be attached at a position away from the bathtub inner wall 1b. Moreover, since the annular seal surface 11 is press-fitted into the O-shaped seal ring 12 by press-fitting the suction cover 7 into the pump tightening nut 6, the bathtub is not affected by the thickness D of the bathtub wall 1a. The suction cover 7 can be attached in a sealed state at a position away from the inner wall 1b.

  The present invention covers the front surface of the suction cylinder from the inside of the bathtub with a suction cover, and attaches and removes the suction cover to the pump clamping nut on the opposite surface between the outer peripheral surface of the pump clamping nut and the inner circumferential surface of the suction cover. By providing attachment means for freely attaching, the suction cover can be attached at a position away from the inner wall of the bathtub without being influenced by the thickness of the bathtub wall. Therefore, it is not necessary to prepare a plurality of types of circulation pumps having different protrusion widths of the suction cylinder portion according to the thickness type of the bathtub as in the conventional case, and one type of circulation pump can be used for various thickness bathtubs. is there.

  In addition, the present invention has the fitting projection of the suction cover and the fitting groove of the pump tightening nut equally arranged at 90 ° in the circumferential direction, respectively, so that the durability of the fitting click feeling when the suction cover is attached and The durability of attachment / detachment can be extended longer than before.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The attachment structure of the suction cover for the circulation pump according to the present invention is applied to a bubble generating bathtub in which bathtub water is circulated by the circulation pump 2 and ejected from an injection port 3 (FIG. 12) provided in the bathtub inner side N.

  As shown in FIG. 1, the suction cylinder part 2a protrudes from the circulation pump 2 arranged on the bathtub outer side M, and the suction cylinder part 2a protrudes into the bathtub inner side N through the opening 4 provided in the bathtub wall 1a. The circulation pump 2 is directly fixed to the bathtub wall 1a by fastening the pump tightening nut 6 from the bathtub inner side N to the screw part 5 provided on the outer peripheral surface of the cylinder part 2a. Reference numeral 17 in FIG. 1 denotes a water supply pipe. As the internal structure of the circulation pump 2, for example, a technique known from Japanese Patent Application Laid-Open No. 8-215267 can be adopted, and detailed description thereof is omitted.

  The front surface of the suction tube portion 2a is covered with a suction cover 7 (suction cover) from the bathtub inner side N. As shown in FIG. 4, suction holes 18 made up of a large number of small holes for sucking bath water are formed in the front cover and the outer peripheral surface of the suction cover 7 of this example. By forming the suction hole 18 small, it is possible to prevent air bubbles from being sucked in, thereby preventing the occurrence of air biting in the circulation pump 2 and ensuring the operational stability of the circulation pump 2.

  The suction cover 7 is detachably attached to the pump clamping nut 6 by attachment means 8.

As shown in FIG. 4, the attachment means 8 of the present embodiment includes a fitting protrusion 8 a that protrudes inward from a part of the inner peripheral surface 7 a of the suction cover 7, and a fitting protrusion 8 a as shown in FIGS. Further, an axial groove 8b1 extending in the axial direction A of the outer peripheral surface 6a of the pump tightening nut 6 and a circumferential groove 8b2 extending from the inner portion 10 of the axial groove 8b1 toward the circumferential direction B of the pump tightening nut 6 Is formed with a substantially L-shaped fitting groove 8b integrally formed. In this example, fitting projections 8 a are projected from four locations on the inner peripheral surface 7 a of the suction cover 7, and fitted grooves 8 b are recessed at four locations on the outer circumferential surface 6 a of the pump tightening nut 6. Each fitting projection 8 a is formed in a square shape that is large enough to fit in the substantially L-shaped fitting groove 8 b of the pump tightening nut 6, and the front surface of each fitting projection 8 a is the suction cover 7. It is flush with the front end surface of the inner peripheral surface 7a. Further, a triangular convex portion 19 (FIG. 4) is projected from the outer peripheral surface of the suction cover 7 at a position facing each fitting projection 8a, while the axial groove on the front surface of the pump tightening nut 6 is provided. A triangular convex portion 20 (FIGS. 2 (a) and (b)) protrudes at a position facing the inlet 9 of 8b1, and each of the triangular convex portions 19 and 20 tightens the suction cover 7 with a pump. When fitted to the attaching nut 6, it functions to align the fitting protrusion 8a and the inlet 9 of the axial groove 8b1. Furthermore, the recessed part 22 (FIG. 2 (a), FIG.3 (a) (b)) is each in the position facing the back end part 21 of the circumferential groove | channel 8b2 in the outer peripheral surface 6a of the pump clamping nut 6. FIG. When the suction cover 7 is rotated, when the triangular convex portion 19 of the suction cover 7 is rotated to a position facing the concave portion 22 of the pump tightening nut 6, the fitting protrusion 8 a of the suction cover 7 is rotated. It is possible to easily visually check the state where the end reaches the inner end 21 of the circumferential groove 8b2. Further, a nut-side protrusion 23 shown in FIG. 3A protrudes from the front end 21 of the circumferential groove 8b2, and a click feeling is obtained when the fitting protrusion 8a gets over the nut-side protrusion 23. it is, and be able to see the state of the fitting projection 8a has reached the inner end 21 of the circumferential groove 8b2 even hand feeling.

  The back surface of the flange portion 6b of the pump tightening nut 6 is locked to the bathtub wall 1a via a U-shaped rubber packing 16. In this example, an annular convex portion 24 (FIG. 2C) concentric with the flange portion 6b protrudes from the back surface of the flange portion 6b, and the annular convex portion 24 bites into the packing 16 so that the pump tightening nut 6 and the packing are sealed. Further, the water tightness between 16 is further improved, and water leakage from the gap between the pump tightening nut 6 and the packing 16 to the bathtub outside M is surely prevented.

  In addition, a plurality (four in this example) of recessed portions 26 are provided on the outer peripheral portion of the front side of the pump tightening nut 6 at intervals in the circumferential direction B. The pump clamping nut 6 can be fastened to the threaded portion 5 of the suction cylinder portion 2a by inserting the chuck portion of the tool into each recess portion 26 and rotating the tool.

  Thus, when the triangular protrusion 19 of the suction cover 7 is aligned with the triangular protrusion 20 of the pump tightening nut 6 and the suction cover 7 is pushed in the axial direction of the pump tightening nut 6, the suction cover 7 is fitted. When the mating protrusion 8a is inserted into the axial groove 8b1 of the fitting groove 8b of the pump tightening nut 6, and then the suction cover 7 is rotated at a predetermined angle in the circumferential direction B, the fitting protrusion 8a is covered. It will be in the attachment state latched by the circumferential groove | channel 8b2 of the fitting groove | channel 8b. Thus, by fitting the suction cover 7 in the axial direction A to the pump tightening nut 6 in the axial direction and the rotating operation in the circumferential direction B in this order, the fitting protrusion 8a of the suction cover 7 is made into the pump tightening nut. 6 can be fitted in the substantially L-shaped fitting groove 8b.

  Thus, the suction cover 7 is not directly attached to the suction cylinder portion 2a of the circulation pump 2, but is attached to the pump tightening nut 6 fastened to the suction cylinder portion 2a. Even if the thickness D of the bathtub increases, the position of the pump tightening nut 6 only moves to the bathtub inner side N by the thickness ΔD of the bathtub wall 1a, and the inner wall of the bathtub is not affected by the thickness D of the bathtub wall 1a. The suction cover 7 can be attached at a position at a distance d (FIG. 1B) away from 1b. Therefore, it is not necessary to prepare a plurality of types of circulation pumps 2 having different protrusion widths of the suction cylinder portion 2a according to the thickness D of the bathtub 1 as in the prior art. 1 can be handled.

  Further, since the distance between the suction cover 7 and the bathtub wall 1a is constant, the hair is not bitten and fluctuations in the suction prevention performance can be prevented.

  Further, in this example, as shown in FIG. 2 (a), the inlet 9 of the axial groove 8b1 is opened in a bowl shape, so that when the suction cover 7 is started to be attached to the pump tightening nut 6, the suction cover 7 The fitting protrusion 8a can be smoothly inserted from the wide entrance 9 of the axial groove 8b1, and the attachment work of the suction cover 7 is further increased. Further, by rotating the suction cover 7 until the triangular convex portion 19 of the suction cover 7 faces the concave portion 22 of the pump tightening nut 6, the fitting protrusion 8a of the suction cover 7 becomes the inner end of the circumferential groove 8b2. The state of reaching 21 can be easily confirmed. In addition, there is an advantage that the fitting state can be judged by touch even when the fitting protrusion 8a gets over the nut-side protrusion 23 (FIG. 3A) provided in front of the inner end 21 of the circumferential groove 8b2. .

  In addition, as shown in FIG. 3C, the groove widths h and i (<h) of the circumferential groove 8b2 of the fitted groove 8b may be narrowed toward the back. In this case, since the fitting protrusion 8a bites into the circumferential groove 8b2 and is prevented from coming off, the fitting protrusion 8a is unlikely to come off from the fitting groove 8b, and the attachment strength of the suction cover 7 can be sufficiently secured. Benefits are gained.

  By the way, in a jet bath of a type in which a conventional circulation pump is directly attached to a bathtub, PPE resin mixed with 30% glass is used as a nut material in order to give the pump clamping nut 6 strength. On the other hand, the suction cover 7 is made of PP resin in consideration of the wearing and drying performance. In this case, when the attachment / detachment operation of the suction cover 7 without mixing glass increases, the fitting protrusion 8a of the suction cover 7 is scraped by the nut-side protrusion 23 of the pump tightening nut 6 at the time of final fitting. There arises a problem that the click feeling at the time of fitting becomes weak.

However, in this embodiment, as shown in FIGS. 2 and 4, the fitting protrusion 8a of the suction cover 7 and the fitting groove 8b of the pump tightening nut 6 are equally arranged at 90 ° in the circumferential direction B, respectively. , the groove bottom of the circumferential groove 8b 2 of the fitting groove 8b of the four positions of the pump fastening nut 6, by a nut-side projection 23 to get over the fitting projection 8a during the final fitting of the suction cover 7 projecting respectively Yes. As shown in FIG. 2, the fitting protrusion 8a of the suction cover 7 and the fitting groove 8b of the pump tightening nut 6 are equally arranged at 90 ° in the circumferential direction B, so that the fitting protrusion 8a. When the nut rides over the nut-side protrusion 23, the contact pressure applied from the nut-side protrusion 23 to the fitting protrusion 8a is distributed to the four fitting protrusions 8a equally divided at 90 ° in the circumferential direction. . As a result, the fitting protrusion 8a can be prevented from being scraped or cracked. As a result, the click feeling when the fitting protrusion 8a gets over the nut-side protrusion 23 can be maintained for a long time.

  5 to 8 show other embodiments. In this example, the projection height T from the groove bottom 42 of any one of the nut-side protrusions 23 among the four nut-side protrusions 23 equally divided by 90 ° in the circumferential direction of the pump tightening nut 6 is different. Are formed higher than the protruding height t of the three nut-side protrusions 23, or one protruding height of the two nut-side protrusions 23, 23 opposed to each other in the diameter direction is higher than the other protruding height. Try to form. Other configurations are the same as those of the embodiment of FIGS. 1 to 4, and corresponding portions are denoted by the same reference numerals and detailed description thereof is omitted. Here, r1 in FIG. 5 is an outer diameter dimension between the upper surfaces of the nut-side protrusions 23 and 23 when the protrusion height of one of the two nut-side protrusions 23 and 23 opposed in the diameter direction is high and the other is low. R1 ′ is an outer diameter between the upper surfaces of the nut-side protrusions 23 and 23 when the protrusion heights T of the two nut-side protrusions 23 and 23 opposed in the diameter direction are both low, and r1 ′> r1 is there. In addition, r2 in Fig.4 (a) is an internal-diameter dimension between each upper surface of the two fitting protrusions 8a and 8a facing the diameter direction of the suction cover 7. FIG.

  In this embodiment, the difference between the outer diameter r1 (FIG. 5) of the pump tightening nut 6 and the inner diameter r2 (FIG. 4) of the suction cover 7 is about 0.5 mm. Utilizing this structure, a click feeling can be obtained. For example, the projection height T of one nut-side projection 23 or two adjacent nut-side projections 23, 23 among the four nut-side projections 23 is set higher than the other nut-side projections 23. That is, a total of four nut-side protrusions 23 are provided in the portions S1, S2, S3, and S4 in FIG. 5, but only one of the nut-side protrusions 23 is raised, and the other three nut-side protrusions 23 are provided. , Or one of the nut-side protrusions 23 of S1 and S3 that are opposite to each other in the diametrical direction is high and one nut-side protrusion 23 of each of S2 and S4 that is opposite to the diametrical direction is high. The other may be lowered. As a result, the four nut-side protrusions 23 become asymmetrical, and when the suction cover 7 is opened and closed, as shown in FIG. 7, the nut-side protrusions 23a (FIGS. 7 and 9) having a high protrusion height T and this are shown. Since the main contact is made with the fitting protrusion 8a corresponding to the above, a sufficient fitting click feeling can be obtained, and at this time, as shown in FIG. A gap w (for example, about 0.5 mm) is formed between the protrusion 23b and the fitting protrusion 8a, and the suction cover 7 is rattled by the gap w. The shaving of the protrusion 8a is distributed to the other fitting protrusions 8a. As a result, the four fitting protrusions 8a can be prevented from being scraped or cracked, and as a result, the durability of the suction cover 7 not mixed with glass can be extended significantly (for example, up to four times). . According to the experiment, it was recognized that the durability of the click feeling at the time of mounting the cover and the attachment / detachment durability (scraping durability) of the suction cover can be extended to 2 to 4 times the conventional one, respectively.

Furthermore, in this embodiment, as shown in FIG. 9, the protrusion shape of the nut side protrusion 23a with a high protrusion height T has an asymmetric structure between the input side A and the back side B. In the example of FIG. 9, the entrance-side corner R1 facing the entrance-side A of the nut-side protrusion 23a and the back-side corner R2 facing the back side B of the circumferential groove 8b2 are chamfered, respectively. The curvature of the side corner portion R1 is set to be approximately twice as large as the curvature of the back side corner portion R2. That is, when the entrance side corner portion R1 is a curved surface of 1R, the back side corner portion R2 is a curved surface 0.5R that is half of 1R. Note that the magnitude of the curvature is not limited to twice, and the setting can be changed as appropriate. Thus, when the suction cover 7 is finally fitted, the fitting protrusion 8a can easily get over and get over the large curvature entrance side corner R1 of the nut-side protrusion 23a having a high protrusion height T which is the main contact. After that, it becomes difficult to return by the rear corner R2 having a small curvature. Thus, the suction write cover 7 Te termination smell tightening becomes and out structure difficult easily fitted to the pump fastening nut 6, easily disengaged by rotating the suction cover 7 with bathing's foot hits There is an advantage that can be prevented.

  FIG. 10 shows another embodiment of the attachment means 8. The attachment means 8 of this example is an O in which the annular seal surface 11 is fitted into the annular seal surface 11 formed on the inner peripheral surface 7 a of the suction cover 7 and the outer peripheral surface 6 a of the pump tightening nut 6. And a shaped seal ring 12. Other configurations are the same as those of the embodiment of FIG. 1, and the same reference numerals are given to the same portions. In this example, the suction cover 7 is press-fitted into the pump tightening nut 6 so that the annular seal surface 11 is press-fitted to the O-shaped seal ring 12 and sealed. Therefore, the suction cover 7 can be attached in a sealed state at a position away from the bathtub inner wall 1b without being influenced by the thickness D of the bathtub wall 1a.

FIG. 11 shows a reference form of the attachment means 8. The attachment means 8 of this example comprises a female screw 13 formed on the inner peripheral surface 7a of the suction cover 7 and a male screw 14 formed on the outer peripheral surface 6a of the pump tightening nut 6 and screwed into the female screw 13. A contact surface 15 that seals between the pump tightening nut 6 and the suction cover 7 in a screwed state is provided. Other configurations are the same as those of the embodiment of FIG. 1, and the same reference numerals are given to the same portions. In this example, one surface of the flange portion 6b protruding from the outer peripheral surface 6a of the pump tightening nut 6 serves as the contact surface 15, and the outer peripheral front end surface 7b of the suction cover 7 abuts against this contact surface 15, thereby Sealing between the attached nut 6 and the suction cover 7 becomes possible. Furthermore, in this example, the rib 30 protruding from the inner surface of the suction cover 7 is brought into contact with the front surface of the pump tightening nut 6 when screw tightening is completed, and there is an advantage that variation in the screwing depth can be surely eliminated.

  The attachment structure of the suction cover for the circulation pump of the present invention is widely applicable to a jet bath in which the circulation pump is directly attached to the bathtub.

It is side surface sectional drawing explaining the attachment structure of the suction cover for circulation pumps used for the bubble generation bathtub of one Embodiment of this invention, (a) shows the state before attaching a suction cover to a pump clamping nut, (b ) Shows a case where the bathtub wall is thin, and (c) shows a case where the bathtub wall is thick. The pump clamping nut same as the above is shown, (a) is a front view seen from the inside of the bathtub, (b) is a side view, and (c) is an enlarged view of the main part of (b). (A) is the figure seen from the arrow G of (b), (b) is the figure seen from the arrow F of FIG. 2 (a), (c) is the groove width of the circumferential groove same as the above. It is explanatory drawing of embodiment at the time of narrowing so that it goes to. The suction cover same as the above is shown, (a) is a front view seen from the inside of the bathtub, (b) is a plan view, (c) is a bottom view, (d) is a side view, and (e) is an E part of (a). FIG. It is a front view of other embodiment of a pump clamping nut same as the above. (A) is a figure which shows the nut side protrusion with the low protrusion height of FIG. 5, (b) is the figure seen from the arrow G of (a). (A) is a figure which shows the nut side protrusion with the high protrusion height of FIG. 5, (b) is the figure seen from the arrow G of (a). It is a figure explaining the positional relationship of the nut side protrusion and fitting protrusion with low protrusion height same as the above. It is a figure explaining the positional relationship of a nut side protrusion with high protrusion height same as the above, and a fitting protrusion. (A) is side surface sectional drawing which shows other embodiment of this invention, (b) is a principal part enlarged view explaining the attachment means of (a). (A) is side surface sectional drawing which shows the reference form regarding this invention, (b) is a principal part enlarged view explaining the attachment means of (a). It is the side view which showed the conventional bubble generation bathtub. It is a partially cutaway sectional view showing a case where a suction cover is attached to a suction cylinder part of a conventional circulation pump. It is a front view of the circulation pump which has a suction cylinder part with which the conventional suction cover is mounted | worn. (A) is a front view of the conventional suction cover, (b) is side sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 1a Bathtub wall 2 Circulation pump 2a Suction cylinder part 3 Injection port 4 Opening part 5 Screw part 6 Pump tightening nut 6a Outer peripheral surface 7 Suction cover 7a Inner peripheral surface 8 Mounting means 8a Fitting protrusion 8b Fitted groove 8b1 Axis Directional groove 8b2 Circumferential groove 9 Entrance 10 Back 11 Annular seal surface 12 O-shaped seal ring 13 Male screw 14 Female screw 15 Contact surface 23 Nut side protrusion 23a Nut side protrusion with high protrusion height 23b Nut side protrusion with low protrusion height A Axial direction B Circumferential direction

Claims (6)

In the circulation pump used for the bubble generation bathtub in which the bathtub water is circulated by the circulation pump and ejected from the injection port provided inside the bathtub, the suction cylinder part is projected from the circulation pump arranged outside the bathtub, and the suction cylinder part is connected to the bathtub wall The circulation pump is fixed to the bathtub wall by fastening the pump tightening nut from the inside of the bathtub to the screw part provided on the outer peripheral surface of the suction cylinder part through the opening provided in the suction cylinder part, and the suction cylinder part Mounting means for covering the front of the tub with a suction cover from the inside of the bathtub and detachably attaching the suction cover to the pump tightening nut on the opposite surface of the outer peripheral surface of the pump tightening nut and the inner peripheral surface of the suction cover The attachment means includes a fitting protrusion protruding inward from a part of the inner peripheral surface of the suction cover, and a shaft extending in the axial direction of the outer peripheral surface of the pump tightening nut while the fitting protrusion is fitted. Direction groove and the Mounting structure of the suction cover circulation pump, characterized in that the circumferential groove that extends from the back portion of the groove in the circumferential direction of the pump tightening nut is made of an object to be fitted grooves of substantially L-shaped integrally formed . The fitting projection of the suction cover and the fitting groove of the pump tightening nut are equally arranged at 90 ° in the circumferential direction, and the groove bottom portion of the circumferential groove in the four fitting grooves of the pump tightening nut 2. The suction cover mounting structure for a circulation pump according to claim 1, wherein a nut-side protrusion over which the fitting protrusion gets over when the suction cover is finally fitted is provided. Of the nut-side protrusions provided in the four mating grooves equally arranged at 90 ° in the circumferential direction, the projection height from the groove bottom of any one of the nut-side protrusions is set to the other three places. Or the height of one of the two nut-side projections facing the diameter direction of the pump tightening nut is made higher than the height of the other projection. The structure for mounting a suction cover for a circulation pump according to claim 2, The entrance-side corner facing the entrance side of the circumferential groove of the nut-side protrusion having a high protrusion height and the back-side corner facing the back side of the circumferential groove are chamfered, respectively. 4. The structure for mounting a suction cover for a circulation pump according to claim 3, wherein the curvature is set to be larger than the curvature of the back corner . The suction cover circulation pump according to any one of claims 1 to 4, characterized in that to form an inlet of the axial groove in the fitting groove of the suction cover wider shape than the inner part Mounting structure. In the circulation pump used for the bubble generation bathtub in which the bathtub water is circulated by the circulation pump and ejected from the injection port provided inside the bathtub, the suction cylinder part is projected from the circulation pump arranged outside the bathtub, and the suction cylinder part is connected to the bathtub wall The circulation pump is fixed to the bathtub wall by fastening the pump tightening nut from the inside of the bathtub to the screw part provided on the outer peripheral surface of the suction cylinder part through the opening provided in the suction cylinder part, and the suction cylinder part Mounting means for covering the front of the tub with a suction cover from the inside of the bathtub and detachably attaching the suction cover to the pump tightening nut on the opposite surface of the outer peripheral surface of the pump tightening nut and the inner peripheral surface of the suction cover The mounting means includes an annular seal surface formed on the inner peripheral surface of the suction cover, and an O-shaped seal ring that is fitted into the outer peripheral surface of the pump tightening nut and the annular seal surface is press-fitted. Mounting structure of the suction cover circulation pump you characterized by comprising.

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