JP6376515B2 - Circulation adapter with bubble generation function - Google Patents

Description

The present invention relates to a circulation adapter with a bubble generating function which is installed in a bathtub and used for hot water circulation for bathing and the like, and also has a function of ejecting a water flow containing bubbles into the bathtub.
The squirting water flow containing bubbles produces, for example, a body warming effect for a bather (an effect that the thermal effect on the body can be enhanced by continuing to bounce on the surface while fine bubbles rub against the body surface).

The present applicant has previously proposed the one described in Patent Document 1 as an example of a circulation adapter with a bubble generating function.
In the circulation adapter described in the document, a bubble hot water outflow path is formed in the adapter main body in addition to the additional hot water outflow path. The former is a hot water flow channel for allowing hot water heated by the hot water supply device to flow out into the bathtub during normal bathing, and the latter is a hot water flow channel that allows a jet of water containing bubbles to be jetted into the bathtub. is there. The circulation adapter is provided with a hot and cold flow path switching mechanism that allows the hot and cold water supplied from the hot water supply apparatus to selectively flow into either the reheating hot water outflow path or the bubble hot water outflow path. Yes. The hot water flow path switching mechanism includes an operation member that is manually operated by a bather, and a valve shaft and a valve body that are displaced in response to a moving operation of the operation member.

The operation member plays a role as a cam (cam plate) for displacing the valve shaft and the valve body in the front-rear direction of the adapter main body, and the basic mechanism is a structure as shown in FIG. It is.
In the figure, the operation member 8 has an inclined (inclination angle α) guide surface 84 that functions as a cam surface, and a bearing 91 fixed to the valve shaft 90 is provided with respect to the guide surface 84. It can be contacted. The bearing portion 91 is urged in a direction in contact with the guide surface 84 by the elastic force of the spring 92. By moving the operating member 8 in the direction D1 in the figure, the valve shaft 90 and the valve bodies 93 and 94 can be displaced in the direction D2 intersecting the direction D1.

However, the prior art still has room for improvement as described below.
That is, the operation member 8 is moved manually by the user. On the other hand, since the operation member 8 is at a relatively low height of the bathtub and is in a position immersed in hot water, it cannot be said that the operation member 8 is in an easily operable position. For this reason, it is desired to make the operability of the operation member 8 better. Conventionally, if the inclination angle α of the guide surface 84 is increased to reduce the amount of movement of the operation member 8, the operation of the operation member 8 becomes heavy. In order to solve this problem, when the inclination angle α is reduced, the amount of movement of the operating member 8 in the direction D1 must be increased, and the operability is not so good.

JP 2010-96385 A

The present invention has been conceived under the circumstances as described above, and switching for selectively flowing hot water supplied from the outside to one of the hot water outlet and the bubble hot water outlet. An object of the present invention is to provide a circulation adapter with a bubble generation function that can improve operability.

  In order to solve the above problems, the present invention takes the following technical means.

  The circulation adapter with a bubble generating function provided by the present invention includes, as a hot water flow path, an adapter main body part that internally forms an additional hot water outflow path and a bubbling hot water outflow path, and hot water supplied from the outside. An operation member for performing a hot water / water flow switching operation for selectively flowing to one of the hot water / water outflow passage and the bubbling / hot water outflow passage, and displacement in the front-rear direction of the adapter main body corresponding to the movement of the operation member A hot water flow path switching mechanism having a valve shaft and a valve body, and the operation member is disposed on a front surface side of the adapter main body, is movable in a direction crossing the front-rear direction, and A guide surface on which a bearing portion provided on the valve shaft abuts with a spring force toward the rear side of the adapter main body portion is provided on the front surface of the operation member. The second end side is inclined such that the height in the front-rear direction is higher than the first end side in the moving direction of the operating member, and the operating member moves in the crossing direction. The hot water flow path switching operation is performed by the relative movement of the bearing portion to a position corresponding to each of the first and second end portions of the guide surface. In the circulation adapter with a bubble generating function, the guide surface is formed as a concave portion in which the region of the first end portion is recessed toward the rear side of the adapter main body portion, and an edge portion of the concave portion An inclined surface is formed in a region between the second end portion and the second end portion.

According to such a configuration, the following effects can be obtained.
That is, since the concave portion is provided in the region of the first end portion of the guide surface, the difference in height between the first end portion and the second end portion of the guide surface can be increased. For this reason, it is possible to reduce the gradient of the inclined surface formed in the region between the edge of the concave portion and the second end. Therefore, the operation when moving the bearing portion of the valve shaft in contact with the inclined surface becomes lighter and smoother. For this reason, according to the present invention, while adopting a simple structure in which a concave portion is formed on a part of the guide surface, the hot water supplied from the outside is reclaimed and the hot water flow path and the bubbling hot water flow are provided. There is an advantage that the operability at the time of switching to selectively flow to one of the exit paths can be made better than before.

  In the present invention, it is preferable that the inclined surface of the guide surface has a smaller inclination gradient in the region closer to the second end than in the region closer to the first end.

According to such a configuration, the following effects can be obtained.
That is, when the bearing portion of the valve shaft is relatively moved from the first end portion side to the second end portion side of the guide surface, this operation is performed by the spring force acting on the bearing portion (the rear side of the adapter main body portion). This is done against the spring force). For this reason, the spring force becomes stronger as the bearing portion moves closer to the second end portion region of the guide surface, and there is a possibility that the resistance becomes large when the operation member is operated. On the other hand, if the inclined surface of the guide surface has a gradient as described above, the sliding resistance when the bearing portion moves closer to the second end portion of the guide surface can be reduced, and the bearing portion is the second one. It is possible to alleviate the phenomenon that the operation member becomes heavier when it moves closer to the end.

In the present invention, preferably, the operating member is formed with a long hole having a shape along the moving direction of the operating member, and both side edges in the short direction of the long hole are used as the guide surface. The bearing portion has a member that is separate from the valve shaft and is rotatably fitted to the valve shaft, and the valve shaft is moved in the axial length direction. The tip end surface that contacts the guide surface is formed in a partially spherical shape or a partially conical surface, and the first and second guide surfaces are the first and second guide surfaces, respectively. The starting points of the inclined surfaces in the region near the end of 1 are displaced from each other.

  According to such a configuration, when the bearing portion of the valve shaft passes through the first end portion region of the first and second guide surfaces, the bearing is sequentially brought into contact with the starting point of the inclined surface. The part can be rotated around the valve shaft. For example, when the operating member is repeatedly operated many times without such rotation of the bearing portion, uneven wear occurs at the tip of the bearing portion, and the valve shaft and the valve are caused by the uneven wear. Although the operation accuracy of the body may be deteriorated, according to the configuration, such a concern can be appropriately prevented.

  In the present invention, preferably, the adapter main body portion is provided with a guide recess for slidingly guiding the operation member in the intersecting direction by inserting at least a part of the operation member. Is provided with an elastically deformable portion that comes into contact with or approaches the inner wall surface of the guide recess, and the bearing portion is provided on the inner wall surface of the guide recess and the elastic deformable portion. An engaging convex portion and an engaging concave portion that engage with each other so that the operation member is positioned and held when the guide surface is relatively moved to a position corresponding to each of the first and second end portions of the guide surface. Is provided.

  According to such a configuration, when the bearing portion relatively moves to a location corresponding to each of the first and second end portions of the guide surface, the operation member can be appropriately positioned and held, This is preferable in order to eliminate the possibility of the operating member moving carelessly. The elastically deformable portion provided with one of the engaging convex portion and the engaging concave portion is provided in the operating member. According to the structure in which the elastic deformable portion is provided in the operating member as described above, the elastically deformable portion is Compared with the case where it is provided on the component of the adapter main body, it is easy to manufacture and is preferable in reducing the manufacturing cost.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a perspective view which shows an example of the circulation adapter with a bubble generation function which concerns on this invention. It is a schematic explanatory drawing which shows one usage example of the circulation adapter shown in FIG. (A), (b) is a schematic sectional drawing which shows the operation state of the circulation adapter shown in FIG. (A) is IVa-IVa principal part sectional drawing of Fig.3 (a), (b) is IVb-IVb principal part sectional drawing of FIG.3 (b). It is principal part sectional drawing which shows the detail of the operation member of the circulation adapter shown in FIG. (A) is a general | schematic front sectional view of the state which removed the cover body of the circulation adapter in FIG. 1, (b) is a principal part expanded front sectional view of (a). FIG. 7 is an exploded front sectional view of FIG. (A), (b) is principal part plane sectional drawing which shows the other example of this invention. (A), (b) is a principal part schematic plane sectional drawing which shows an example of a prior art.

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

As shown in FIG. 2, the circulation adapter A with a bubble generating function shown in FIG. 1 is used by being attached to the side wall 10 of the bathtub 1, and includes a water heater 2 such as a gas water heater, an outward pipe 20 and a return pipe 21. Connected through. Thereby, the hot water filling to the bathtub 1 and the reheating operation of the hot water of the bathtub 1 are possible via the circulation adapter A. In addition, when hot water is circulated in the same manner as in the chasing operation, it is possible to eject a jet water flow containing bubbles in the bathtub 1.

  As clearly shown in FIG. 3, the circulation adapter A is assembled to the adapter main body portion 5 in which the reheating water outflow passage 71 and the bubbling hot water outflow passage 72 are formed, and the adapter main body portion 5. And a hot water flow path switching mechanism B.

  The adapter main body 5 is shown as a single member in FIG. 3, but is configured by combining a plurality of housing members. In the adapter main body 5, as a hot water flow path, a return flow path 7 </ b> B for guiding the hot water sucked into the hot water inlet 70 on the front surface of the adapter main body 5 to the return pipe 21, and the forward pipe 20 are provided. An outward flow path 7A for receiving hot water supply is provided. This forward flow path 7 </ b> A is branched into a follow-up hot water outflow path 71 and a bubbling hot water outflow path 72. The refilling hot water outflow passage 71 is a portion for allowing normal hot water circulation without bubbles when retreating the bath, and the terminal portion thereof is a discharge port for hot water opened in the front peripheral wall portion of the adapter main body 5. 71a.

  The bubbling hot water outflow path 72 includes a swirling chamber 73 for generating a swirling flow of hot water, and the terminal end thereof is a nozzle port 72 a for bubbling hot water jetting opened at the front surface of the adapter main body 5. When hot water flows into the swirl chamber 73 from the opening 74 provided on the peripheral wall thereof, the hot water becomes a swirling flow. On the other hand, an air inlet 55 is provided on the rear side of the swirl chamber 73. The inflow port 55 communicates with an air introduction port 55a provided on the rear side of the housing 5, and due to the generation of negative pressure due to the swirl flow in the swirl chamber 73, the inflow port 55 and the inflow port 55a Air is introduced into the swirl chamber 73. As a result, a swirling flow of gas-liquid mixing is generated, and a swirling water flow in a swirling flow state containing many fine bubbles is ejected from the nozzle port 72a. In FIG. 3, a member denoted by reference numeral 56 is for blocking the jet water flow in a portion that is greatly expanded out of the jet water flow jetted from the nozzle port 72 a.

  The hot water flow path switching mechanism B includes valve bodies 61 and 62 supported by the valve shaft 63, a spring 66, the operation member 3, and a bearing portion 64 fixedly attached to the valve shaft 63. The valve shaft 63 and the valve bodies 61 and 62 can reciprocate in the front-rear direction (hereinafter simply referred to as “front-rear direction”) of the adapter body 5 in response to an operation of the operation member 3 described later. Due to this reciprocation, the valve bodies 61 and 62 are brought into contact with and separated from the valve seats 57 and 58, respectively, and as shown in FIG. The state where the hot water flow in the outlet 72 is made possible and the bubbling hot water is ejected from the nozzle port 72a, and as shown in FIG. It is possible to switch between a state in which normal hot water discharge from the discharge port 71a is possible by allowing hot water flow.

  As shown in FIGS. 6 and 7, the operation member 3 is formed by integrally molding a main body portion 30, a pair of left and right elastically deformable portions 31, and an operation lever portion 32 (see FIG. 6). And FIG. 7 is a front view with the cover body 59 shown in FIG. 1 removed. A front-side portion of the adapter main body 5 is provided with a guide concave portion 53 having a circular arc shape when viewed from the front. The main body portion 30 and the elastically deformable portion 31 of the operation member 3 are fitted into the guide recess 53, and the operation member 3 is pulled into the guide recess by grasping the operation lever portion 32 and applying a force in the left-right direction. It is possible to slide along an arc locus along 53.

The main body portion 30 of the operation member 3 is formed with a long hole 33 having a circular arc shape in front view through which the valve shaft 63 is inserted. The front surface portion (cross hatched portion in FIG. 6B) of the peripheral edge portion of the long hole 33 is a guide surface 34 for moving the bearing portion 64 back and forth. Although details of the guide surface 34 will be described later, as shown in FIG. 4, basically, the second end portion 34 b is more than the first end portion 34 a in the longitudinal direction of the guide surface 34. The height H (height in the front-rear direction) is high. The guide surface 34 serves as a cam surface that moves the bearing portion 64 in the front-rear direction.

  More specifically, as clearly shown in FIG. 5, the bearing portion 64 is configured by a member separate from the valve shaft 63, and the front end of the valve shaft 63 is opposed to the guide surface 34. Positioning with respect to the valve shaft 63 is achieved by using a retaining ring 65 that is rotatably fitted to the side portion. The bearing portion 64 has a configuration in which a tip surface facing the guide surface 34 is partially spherical or partially conical. The bearing portion 64 is biased in a direction approaching or contacting the guide surface 34 by the force F of the spring 66 shown in FIG. Although the valve shaft 63 can move in the front-rear direction, movement in other directions is restricted.

  As shown in FIG. 4A, when the bearing portion 64 is at a position facing the first end portion 34a of the guide surface 34, the bearing portion 64 and the valve shaft 63 are most retracted in the right direction in the figure. In this position, the bubble jettable state shown in FIG. 3A is set. In this case, as clearly shown in FIG. 5, a gap c1 having a dimension L1 is formed between the bearing portion 64 and the first end portion 34a, as shown in FIG. 3 (a). In addition, the valve body 61 is appropriately brought into contact with the valve seat portion 57. When the valve body 61 is brought into contact with the valve seat portion 57, if the bearing portion 64 is brought into contact with the guide surface 34, it may be difficult to press the valve body 61 strongly against the valve seat portion 57. The gap c1 helps to eliminate such a fear.

  As shown in FIG. 4B, when the operation member 3 is slid along the front surface portion of the adapter main body 5 and the bearing portion 64 is at a position facing the second end portion 34 b of the guide surface 34. The bearing portion 64 and the bearing portion 64 are at the most advanced position in the left direction of FIG. As a result, the normal refillable hot water dischargeable state shown in FIG. 3B is set.

  As clearly shown in FIG. 5, the region of the first end 34 a of the guide surface 34 is a concave portion 35 that is recessed toward the rear side of the adapter main body 5. Of the region from the edge 35a to the second end 34b of the concave portion 35, the vicinity region AR1 of the edge 35a and the predetermined width region AR2 of the second end 34b are non-inclined surfaces. However, the area AR3 between them is an inclined surface 37.

  In FIG. 6B, the guide surface 34 is strictly divided into first and second guide surfaces 34A and 34B that are located with the elongated hole 33 interposed therebetween. Preferably, the starting points Sa and Sb (portions indicated by S in FIG. 5) of the inclined surfaces 37 of the first and second guide surfaces 34A and 34B are displaced from each other in the direction in which the guide surface 34 extends. Yes. Such a configuration can bring about an effect that the bearing 64 can be positively rotated to prevent uneven wear of the bearing 64 as will be described later.

  The pair of elastically deformable portions 31 of the operation member 3 can be elastically deformed in a direction facing the inner wall surface 53a of the guide recess 53, and come into contact with the inner wall surface 53a with an appropriate elasticity. The inner wall surface 53 a is provided with a pair of left and right engaging convex portions 54, and each elastically deformable portion 31 has a pair of left and right engaging concave portions 36 that can be engaged and disengaged with the pair of engaging convex portions 54. Is provided. As shown in FIGS. 4 (a) and 4 (b), the engaging convex portion 54 and the engaging concave portion 36 have a bearing portion 64 on each of the first and second end portions 34a and 34b of the guide surface 34. This is a part for engaging with each other and positioning and holding the operation member 3 when they move relative to the corresponding parts.

Preferably, as shown in the enlarged view of the VII portion in FIG. 7, the inclination angles (inclination angles with respect to the normal lines) θ1 and θ2 of the two inclined surfaces 54a and 54b of the engaging convex portion 54 have a relationship of θ1> θ2. ing. The engaging recess 36 has a shape corresponding to the configuration described above. According to such a configuration, when the operating member 3 is moved from the central portion of the guide concave portion 53 toward the end portion, the elastically deformable portion 31 can smoothly get over the inclined surface 54 a, while the engaging convex portion 54. When the engaging recess 36 and the engaging recess 36 are engaged with each other, the engaging state can be prevented from being inadvertently released with a weak force based on the fact that the inclined surface 54b is inclined strongly.

  Next, the operation of the circulation adapter A will be described.

  First, as shown in FIG. 5, since the concave portion 35 is provided in the region of the first end 34a of the guide surface 34, the first end 34a and the second end of the guide surface 34 are provided. It is possible to increase the total height difference L3 from the portion 34b. As the height difference L3, in addition to the dimension L1 of the gap c1 described above, a dimension L2 corresponding to a stroke for causing the valve bodies 61 and 62 to perform the valve opening / closing operation is also required. Here, the dimension L2 corresponding to the stroke is earned by the inclined surface 37, but the inclination angle α1 of the inclined surface 37 can be made smaller than when the concave portion 35 is not provided. That is, the imaginary line La in FIG. 5 shows the case where the entire guide surface 34 is an inclined surface without providing the concave portion 35, but the inclined surface 37 of the present embodiment is inclined as compared with this. It is possible to reduce the angle α1. Therefore, the operation when moving the operation member 3 so that the bearing portion 64 relatively moves from the first end portion 34a side to the second end portion 34b side becomes light and smooth.

  As described with reference to FIG. 6B, the starting points Sa and Sb of the inclined surfaces 37 of the first and second guide surfaces 34A and 34B are displaced from each other. By passing through this region and sequentially hitting the start points Sa and Sb, the bearing 64 can be rotated (rotated) around the valve shaft 63. When the bearing portion 64 is non-rotating, when the operating member 3 is repeatedly operated many times, uneven wear occurs at the tip of the bearing portion 64, and the valve shaft 63 and the valve body 61 are caused by this uneven wear. , 62 may deteriorate. On the other hand, according to this embodiment, such a possibility can be prevented appropriately.

  In addition, according to the present embodiment, when the bearing portion 64 is relatively moved to positions corresponding to the first and second end portions 34a and 34b of the guide surface 34, the engaging convex portion 54 and the engaging concave portion 36 are provided. And the operation member 3 can be properly positioned and held. Therefore, it is preferable to eliminate the possibility that the operation member 3 moves carelessly. The elastically deformable portion 31 provided with the engaging recess 36 is provided in the operating member 3. According to the structure in which the elastically deformable portion 31 is provided in the operating member 3 as described above, for example, the elastically deformable portion 31 and Compared with the case where a similar part is provided on the adapter main body 5 side, the manufacture is easy and the manufacturing cost can be reduced.

  FIG. 8 shows another embodiment of the present invention. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

In FIG. 8A, the inclined surface 37 of the guide surface 34 is curved, and the inclination angle α2 near the second end 34b is the inclination angle α3 near the first end 34a. Has been smaller than.
In FIG. 8B, of the inclined surface 37, the first end portion region 37a and the second end portion region 37b are planar, and the intermediate region 37c is two regions 37a. , 37b are smoothly curved. The inclination angle α4 of the second end portion region 37b is also made smaller than the inclination angle α5 of the first end portion region 37a.

When the bearing portion 64 is relatively moved from the first end portion 34a side to the second end portion 34b side of the guide surface 34, the spring 66 shown in FIG. Will gradually become stronger. For this reason, the operation of the operation member 3 becomes heavier as the bearing portion 64 approaches the second end portion 34b. On the other hand, according to the configuration shown in FIGS. 8A and 8B, the phenomenon that the operation of the operation member 3 becomes heavy when the bearing portion 64 moves closer to the second end portion 34b is eased. More preferable operability can be obtained.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the circulation adapter with a bubble generating function according to the present invention can be variously modified within the intended scope of the present invention.

The bubbling hot water outflow path is a hot water flow path that can eject the jet water flow containing bubbles into the bathtub, and the specific configuration for generating the jet water flow containing bubbles is not limited. The reheating hot water outflow passage is a hot water flow passage through which heated hot water for bath replenishment can flow out into the bathtub. The specific arrangement of these bubbling hot water outflow passages and additional hot water outflow passages is not limited. In accordance with this, the design of the arrangement of the valve body and the valve shaft of the hot and cold flow path switching mechanism can be changed as appropriate.
The bearing portion is preferably formed separately from the valve shaft and provided in the valve shaft in a rotatable state, but is not limited to this. Since the bearing portion only needs to play a cam follower role for displacing the valve shaft and the valve body along the guide surface of the operation member, the bearing portion is configured to be integrated with the valve shaft. Is also possible.

The operation member is not limited to the one that can be slid along the arcuate locus along the arcuate recess for guide, but can be configured to be slidable along the linear locus. The specific inclination angle of the guide surface provided on the operation member is not limited. It is also possible to adopt a configuration in which the operation member is not provided with an elastically deformable portion.
The circulation adapter with a bubble generating function according to the present invention can be used by being attached to the bottom wall portion of the bathtub instead of the side wall portion of the bathtub.

A A circulation adapter with a bubble generating function B Hot water flow path switching mechanism 1 Bath 10 Side wall 3 Operation member 31 Elastically deformable portion 33 Long hole 34 Guide surfaces 34A, 34B First and second guide surfaces 34a, 34b First and second Second end (of the guide surface)
35 Concave part 36 Engaging concave part 37 Inclined surface 5 Adapter body part 53 Guide concave part 54 Engaging convex part 61, 62 Valve body 63 Valve shaft 64 Bearing part 66 Spring 71 Hot water outflow path 72 Bubbling hot water outflow path

Claims (4)

As a hot water flow path, an adapter main body part that forms a memorial hot water outflow path and a bubble hot water outflow path inside,
An operation member for performing a hot water flow switching operation for selectively flowing hot water supplied from the outside to one of the chasing hot water outflow passage and the bubble hot water outflow passage, and corresponding to the movement of the operation member A hot water flow path switching mechanism having a valve shaft and a valve body that are displaced in the front-rear direction of the adapter main body;
With
The operation member is disposed on the front surface side of the adapter main body, and is movable in a direction crossing the front-rear direction, and a bearing portion provided on the valve shaft is provided on the front surface of the operation member. A guide surface that comes into contact with the spring force toward the rear side of the adapter body is provided.
The guide surface is inclined such that the height in the front-rear direction is higher on the second end side than on the first end side in the moving direction of the operation member,
The operation member is moved in the intersecting direction, and the bearing portion is relatively moved to a position corresponding to each of the first and second end portions of the guide surface, whereby the hot water flow channel switching operation is performed. A circulation adapter with a bubble generating function configured to be performed,
The guide surface is formed as a concave portion in which the region of the first end portion is recessed toward the rear side of the adapter main body portion, and between the edge portion of the concave portion and the second end portion. A circulation adapter with a bubble generating function, characterized in that an inclined surface is formed in a region. It is a circulation adapter with a bubble generation function according to claim 1,
The circulation adapter with a bubble generating function is configured such that the inclined surface of the guide surface has a smaller inclination gradient in the region closer to the second end than in the region closer to the first end. It is a circulation adapter with a bubble generation function according to claim 1 or 2,
The operation member is formed with a long hole having a shape along the moving direction of the operation member, and both side edges in the short direction of the long hole are first and second guide surfaces. It is a guide surface,
The bearing portion is configured such that a member separate from the valve shaft is rotatably fitted to the valve shaft, and movement of the valve shaft in the axial length direction is restricted, and the guide surface The tip surface that abuts is formed in a part of a spherical shape or a part of a conical surface,
The circulation adapter with a bubble generating function, wherein the first and second guide surfaces are configured such that start points of the inclined surfaces in the first end portion region are displaced from each other. A circulation adapter with a bubble generating function according to any one of claims 1 to 3,
The adapter main body is provided with a guide recess for inserting at least a part of the operation member and slidingly guiding the operation member in the intersecting direction.
The operation member is provided with an elastically deformable portion that contacts or approaches the inner wall surface of the guide recess with elasticity.
The inner wall surface of the guide recess and the elastically deformable portion are arranged such that when the bearing portion relatively moves to locations corresponding to the first and second end portions of the guide surface, A circulation adapter with a bubble generating function, wherein an engaging convex portion and an engaging concave portion that are engaged with each other so as to be positioned and held are provided.

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