JP2019181075A - Air mixing structure - Google Patents

Abstract

To provide an air mixing structure having a simple structure and suitable for downsizing.SOLUTION: An air mixing structure comprises: a water passage 27 for circulating water toward a water discharge port and causing venturi effect by water flow; and an air passage for supplying outside air flowing into an air inflow port 43 by negative pressure due to the venturi effect, to the water passage 27 via an air outflow port 44. In the air passage, a lip packing 51 is arranged so that the lip part is located on an air outflow port 44 side. When water in the water passage 27 flows into the air passage, the lip part of the lip packing 51 is pushed against the passage wall of the air passage so as to close the air passage. On the other hand, when water flows through the water passage, the lip part is separated from the passage wall by negative pressure so as to allow air flow from the air inflow port 43 to the air outflow port 44.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an aeration structure that mixes air into water.

  There is a shower device in which a shower head is provided with an air mixing structure that mixes air with hot water or cold water (not specifically distinguished in this specification, and simply referred to as “water”), and the air mixed water is discharged from a water outlet of the shower head. The air mixing structure in the shower device includes an air passage that merges with a flowing water passage in the shower head, and is configured to draw air from the outside into the passage and mix it with water in the flowing water passage (for example, a patent Reference 1).

  According to the above-mentioned aeration structure, there are advantages such that the comfort when the shower water touches the skin can be enhanced and a water-saving effect can be expected. However, when the water stop mechanism for temporarily stopping water is mounted on the shower head, there is a possibility that the water in the water channel leaks outside through the air passage. That is, when water is supplied to the shower head continuously, when the water is stopped temporarily on the shower head side by the water stop mechanism, the pressure in the water flow channel increases, so that water flows into the air passage. There was a risk of backflowing inside and outflowing outside.

  Therefore, in Patent Document 2, a taper hole that is reduced in diameter toward the upstream side of the air flow is formed in the air passage, and a ball valve that opens and closes the taper hole is incorporated in the air passage so that the air passage is reversed. An aeration structure provided with a stop mechanism has been proposed. This air mixing structure allows the air flow by separating the ball valve from the taper hole in the shower use state, while the ball valve is pushed by the backflow water in the air passage in the temporary water stop state. The tapered hole is closed so that the backflow water does not flow out.

Japanese Patent No. 4438209 Japanese Patent No. 5007769

  However, in the air mixing structure of the above-mentioned Patent Document 2, not only the structure of the air passage is complicated by the check mechanism using the ball valve, but the ball valve extends in a direction perpendicular to the flow channel and is enlarged in the radial direction. End up.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the aeration structure suitable for size reduction with a simple structure.

The present invention
A water passage that circulates water toward the spout and creates a venturi effect by the water flow;
An air passage having an inlet portion through which air can flow from the outside, and an outlet portion opened in the water passage;
With
An aeration structure that supplies external air drawn from the inlet portion due to the negative pressure due to the venturi effect to the water passage through the outlet portion, and allows aeration water to be discharged from the water outlet,
In the air passage, lip packing is arranged so that the lip portion is on the outlet portion side,
In the lip packing, when water in the water passage flows into the air passage, the lip portion is pressed against a passage wall of the air passage to close the air passage, while the water passage is opened to the water outlet. When the water is flowing toward the outlet, the negative pressure causes the lip portion and the passage wall to be separated from each other, or the pressing force of the lip portion against the passage wall is weakened. It is characterized by permitting the flow of air to the part.

  In the above invention, when the water is temporarily stopped by the water stop function as described in the background art and the flow of water in the water passage stops and becomes a high pressure state, the water flows out from the water passage to the air passage, and the air The outlet side (water passage side) becomes higher than the lip packing of the passage. In this case, the lip portion is pressed against the passage wall of the air passage, the air passage is closed, and leakage of the backflow water is suppressed. On the other hand, in a state where water is flowing through the water passage, the outlet side is more negative than the lip packing of the air passage due to the venturi effect. Then, a gap is formed between the lip portion and the passage wall, or the pressing force of the lip portion on the passage wall of the air passage is weakened, whereby the air flow in the air passage is inhibited by the lip packing. There is no. As a result, air is drawn into the flowing water channel via the air passage, and the aerated water is discharged from the water outlet. Therefore, the structure of the air passage and the check structure is simpler than that of a conventional aeration structure that requires the incorporation of a ball valve in the air passage, and is suitable for downsizing.

The whole block diagram of a shower apparatus. (A) is the back side perspective view of a water flow adapter, (b) is a longitudinal cross-sectional view. (A) is a longitudinal cross-sectional view of a connection main body, (b) is the elements on larger scale of a water flow adapter in the state which omitted the lip packing. (A) is the back side perspective view of a channel | path formation member, (b) is a longitudinal cross-sectional view, (c) is the BB sectional drawing of (b). (A) is a perspective view of a lip packing, (b) is a longitudinal sectional view, and (c) is an enlarged view of a portion A in FIG. 2 (b). The figure which shows the mode of the lip packing in use condition. The longitudinal cross-sectional view which shows the modification of a water flow adapter.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. First, the overall configuration of the shower apparatus 10 to which the aeration structure of the present invention is applied will be described with reference to FIG.

  The shower apparatus 10 includes a faucet 11 for supplying hot water or water (hereinafter simply referred to as “water”), a shower hose 12 having one end connected to the faucet 11, and a shower connected to the other end of the shower hose 12. And a head 13. By these, the water flow path 14 which distribute | circulates water toward the water discharge port 13a of the shower head 13 is comprised, and it switches from the water discharge port 13a by switching the operation handle 11a of the faucet 11 from a closed position to an open position. Shower water is discharged.

  A water passage adapter 15 as an aeration structure is connected between the faucet 11 and the shower hose 12, that is, in the middle of the flowing water passage 14. The water flow adapter 15 is for mixing air into the water flowing through the flowing water channel 14 and discharging the air-mixed water from the water outlet 13 a of the shower head 13.

  The shower head 13 is provided with a water stop button 13b for temporarily stopping water. The water flow path 14 can be closed inside the shower head 13 by switching the water stop button 13b from the discharge position to the water stop position. Thereby, even if it is the situation where the operation handle 11a of the faucet 11 is an open position, discharge of the shower water from the spout 13a can be stopped.

  Next, the water flow adapter 15 as an aeration structure will be described with reference to FIGS. As shown in FIG. 2B, the water flow adapter 15 includes a connection main body 21 and a passage forming member 22 that is detachably attached to the connection main body 21. The connection body 21 and the passage forming member 22 are made of, for example, a synthetic resin.

  As shown in FIG. 3 (a), threaded portions 23 a and 23 b for connecting the water flow adapter 15 to the faucet 11 and the shower hose 12 are provided at both ends in the length direction of the connection main body 21. Yes. The connection main body 21 has a substantially cylindrical shape, and a first through hole (attachment hole) 24 penetrating the connection main body 21 in the length direction (flow direction of the water flow path 14) is formed inside thereof. A passage forming member 22 is inserted into the first through hole 24 as shown in FIG.

  The passage forming member 22 is formed with a second through hole 25 penetrating the passage forming member 22 in the length direction, and the water supplied from the faucet 11 is supplied to the shower hose 12 by the second through hole 25. A water passage 27 leading out is formed. This water passage 27 constitutes a part of the flowing water channel 14 shown in FIG.

  As shown in FIG. 4 (b), the water passage 27 opens to the faucet 11 side at the upstream end (the faucet 11 side) of the water passage 27 and receives water supplied from the faucet 11. A portion 28 is provided. The opening diameter of the receiving part 28 corresponds to the opening diameter of the elbow pipe 11b (FIG. 1) of the faucet 11 to which the water flow adapter 15 is connected, and is substantially the same as the opening diameter of the elbow pipe 11b.

  On the downstream side of the receiving portion 28, a throttle portion 29 that communicates with the receiving portion 28 and has a smaller passage diameter than the receiving portion 28 is formed. The throttle portion 29 is arranged from a tapered first throttle portion 29a whose passage diameter is reduced toward the downstream side, and a downstream side of the first throttle portion 29a, and a substantially linear second throttle portion 29b. It is configured. The narrowed portion 29 only needs to have a smaller passage diameter than the receiving portion 28, and the shape thereof is not limited to the above.

  On the downstream side of the throttle part 29, there is a lead-out part 30 that opens to the shower hose side at the downstream side (shower hose 12 side) end of the water passage 27 and guides the water that has passed through the throttle part 29 to the shower hose 12. Is formed. The derivation unit 30 communicates with the throttle unit 29 and has a larger passage diameter than the throttle unit 29. In the present embodiment, the lead-out portion 30 has a tapered shape in which the passage diameter increases toward the downstream side, but the shape is arbitrary, and it is sufficient if the passage diameter is larger than that of the throttle portion 29. .

  Here, the water flow adapter 15 according to the present embodiment is configured to be able to take in external air and supply it into the water passage 27. Hereinafter, the structure of the air passage for that purpose is demonstrated.

  As shown in FIGS. 4A and 4B, the passage forming member 22 has a substantially cylindrical diameter-expanded portion 33 and a downstream from the diameter-expanded portion 33 in order from the upstream side to the downstream side of the water passage 27. And a substantially round bar-shaped shaft portion 34 extending toward the side. The shaft portion 34 has a smaller diameter than the enlarged diameter portion 33 and is disposed concentrically with the enlarged diameter portion 33. A disc-shaped flange portion 35 that projects outward in the radial direction of the shaft portion 34 is provided at an intermediate position in the length direction of the shaft portion 34, and between the flange portion 35 and the enlarged diameter portion 33, An annular recess 36 that forms an annular shape surrounding the water passage 27 in the circumferential direction and opens outward is formed. The outer diameter D <b> 1 (FIG. 4C) of the flange portion 35 is smaller than the outer diameter D <b> 2 of the enlarged diameter portion 33. The enlarged diameter portion 33, the shaft portion 34, and the flange portion 35 are integrally formed.

  On the other hand, as shown in FIG. 3A, the first through hole 24 formed in the connection main body 21 is provided with a first step portion 25a and a second step portion 25b in the length direction. By these step portions 25a and 25b, a first hole portion 37, a second hole portion 38, and a third hole portion 39 whose hole diameter is gradually reduced from the upstream side toward the downstream side are formed.

  The hole diameter D3 of the first hole portion 37 is slightly larger than the outer diameter D2 of the expanded diameter portion 33 of the passage forming member 22, and the expanded diameter portion 33 can be accommodated inside the first hole portion 37. Yes. As shown in FIG. 2B, in the inserted state of the passage forming member 22, the enlarged diameter portion 33 of the passage forming member 22 contacts the first step portion 25 a of the first through hole 24 in the connection main body 21, thereby The depth position of the passage forming member 22 is defined.

  The hole diameter D4 of the second hole portion 38 is larger than the outer diameter D1 of the flange portion 35 of the passage forming member 22, and the depth dimension H1 of the second hole portion 38 is the height of the flange portion 35 from the enlarged diameter portion 33. It is larger than the dimension H2 (FIG. 4B). Therefore, as shown in FIG. 3B, there are gaps between the outer peripheral surface of the flange portion 35 and the peripheral surface 38a of the second hole portion 38 and between the flange portion 35 and the second stepped portion 25b. 41, 42 are formed. Furthermore, between the flange part 35 and the enlarged diameter part 33, the peripheral surface 38a of the 2nd hole 38 opposes the said annular recessed part 36, and the space part 45 of planar view cyclic | annular form is formed.

  An air inflow port (inlet portion) 43 is provided on the side portion of the connection main body 21 so as to communicate with the space portion 45. Further, the shaft portion 34 of the passage forming member 22 is provided with an air outlet (exit portion) 44 that communicates with the gap 42. The air outlet 44 opens into the throttle portion 29 of the water passage 27.

  With the above configuration, an air passage 46 is formed in which air flows in from the air inlet 43 and flows out from the air outlet 44 into the water passage 27 through the space 45 and the gaps 41 and 42. In the present embodiment, the number of air inlets 43 is one, but the number is arbitrary, and a plurality of air inlets 43 may be provided. Also, the number of air outlets 44 is arbitrary, and a single air outlet 44 may be provided.

  The hole diameter D5 of the third hole portion 39 is substantially the same as the outer diameter (maximum outer diameter) D6 of the shaft portion 34, and a rubber O-ring 47 (FIG. 2B) is provided on the outer peripheral surface of the shaft portion 34. ) Is installed. The O-ring 47 seals the space between the shaft portion 34 and the third hole portion 39 to prevent water from flowing into the air passage 46 from the shower hose 12 side.

  A rubber O-ring 48 is mounted on the outer peripheral surface of the enlarged diameter portion 33. Thus, water is prevented from flowing into the air passage 46 from the faucet 11 side, and the passage forming member 22 is held by the elastic force of the O-ring 47.

  Here, the principle of supplying air to the water passage 27 through the air passage 46 will be described. As already described, the throttle portion 29 is formed in the middle of the water passage 27, and the flow rate of the water received by the receiving portion 28 is increased by passing through the throttle portion 29. Along with this, the pressure of the throttle portion 29 decreases (Venturi effect), and becomes negative with respect to the outside (outside air) of the water flow adapter 15. As a result, external air is sucked from the air inlet 43, and an air flow that passes through the air passage 46 and reaches the air outlet 44 is generated. Thereby, external air is supplied into the water passage 27.

  As shown in FIGS. 4B and 4C, the air outlet 44 has a throttle shape in which the hole diameter decreases toward the water passage 27. For this reason, the air passing through the air passage 46 is vigorously injected into the water passage 27, and the air is evenly mixed into the water flowing through the water passage 27.

  By the way, when the operation handle 11a of the faucet 11 shown in FIG. 1 is set to the open position and the water stop button 13b of the shower head 13 is switched to the water stop position, water is supplied from the water faucet 11 toward the shower head 13. On the other hand, water is not discharged from the water outlet 13 a of the shower head 13. In this case, the pressure in the flowing water channel 14 increases, and the pressure in the water passage 27 also increases in the water flow adapter 15. As a result, there is a possibility that water in the water passage 27 flows into the air passage 46 from the air outlet 44 and flows backward in the air passage 46 and leaks to the outside.

  Therefore, in the water flow adapter 15 according to the present embodiment, a check structure is provided in the air passage 46 in order to prevent leakage of the backflow water as described above. Hereinafter, this check structure will be described with reference to FIG.

  As already described, the air passage 46 includes the air inlet 43, the space 45 (annular recess 36), the gaps 41 and 42, and the air outlet 44 in order from the upstream side of the air flow. Among these, the space 45 and the gap 41 extend in the length direction of the water passage 27, and the first passage portion 46 a (FIG. 3B) that circulates the air flowing into the air inlet 43 in the length direction. The gap 42 constitutes a second passage portion 46 b that extends in a direction intersecting the length direction and introduces the air that has passed through the first passage portion 46 a into the air outlet 44.

  A lip packing 51 having an annular shape in plan view and having a substantially V-shaped cross section is disposed in the space 45, that is, in the middle of the first passage portion 46a. The lip packing 51 is disposed such that the lip portion 52 is on the air outlet 44 side and the heel portion (base portion) 53 is on the air inlet 43 side, and the annular recess 36 of the passage forming member 22 (FIG. 4B). ). The lip packing 51 is made of, for example, chlorine-resistant ethylene propylene diene rubber.

  The inner diameter D7 of the lip packing 51 is slightly smaller than the outer diameter D8 (FIG. 4 (b)) of the shaft portion 34 between the flange portion 35 and the enlarged diameter portion 33, and the height dimension H3 of the lip packing 51 is an annular shape. It is substantially the same as the height dimension H4 of the recess 36. For this reason, the lip packing 51 is fitted into the annular recess 36 in a state where there is no rattling in the radial direction and the axial direction.

  The outer diameter D9 of the distal end portion of the outer peripheral lip portion 54 in a state where the passage forming member 22 is not inserted into the connection main body 21 is the hole diameter D4 of the second hole 38 in the connection main body 21 (FIG. 3A). Is slightly larger than. Therefore, when the passage forming member 22 is inserted into the connection main body 21, the distal end portion of the outer peripheral side lip portion 54 comes into contact with the peripheral surface 38 a of the second hole portion 38. Further, the boundary portion between the outer peripheral lip portion 54 and the heel portion 53 is formed by a curved surface, and a gap 56 (FIG. 5C) is formed between the peripheral surface 38 a of the second hole portion 38. Yes.

  In the lip packing 51, the height dimension H5 of the outer peripheral side lip part 54 is smaller than the height dimension H6 of the inner peripheral side lip part 55, and between the front end part of the outer peripheral side lip part 54 and the flange part 35. Is formed with a gap 57 (FIG. 5C). For this reason, when the water in the water passage 27 flows back through the air passage 46, the backflow water can flow into the groove 58 between the outer peripheral lip portion 54 and the inner peripheral lip portion 55 through the gap 57. It has become. A tapered portion 59 that is inclined downward toward the groove portion 58 is formed at the front end portion of the outer peripheral lip portion 54 over the entire circumference, and the tapered portion 59 suitably guides the backflow water to the groove portion 58 side. be able to.

  Next, operation | movement of the water flow adapter 15 is demonstrated, referring FIG. First, the case where the operation handle 11a is set to the open position and the water stop button 13b is set to the water discharge position will be described with reference to FIG. In this case, when the water flows through the water flow path 14 toward the water discharge port 13a, the throttle portion 29 is decompressed due to the venturi effect. Thereby, the air in the space 45 (in the groove 58 of the lip packing 51) is sucked through the gaps 41, 42, and 56.

  As a result, the inside of the groove portion 58 becomes negative pressure with respect to the air inlet 43 side, and the outer peripheral lip portion 54 is deformed so as to be separated from the peripheral surface 38a of the second hole portion 38. For this reason, the clearance gap 60 is formed between the outer peripheral side lip | rip part 54 and the said surrounding surface 38a, and the air inflow port 43 and the air outflow port 44 are connected. Therefore, external air is sucked from the air inlet 43 and flows toward the air outlet 44.

  When the outer peripheral lip portion 54 is deformed, the outer peripheral lip portion 54 may come into contact with the flange portion 35 and the deformation may be hindered. In order to suppress the occurrence of such inconvenience, it is preferable to reduce the diameter of the flange portion 35 and extend the distance from the tip portion of the outer peripheral lip portion 54. However, in this case, since the distance between the outer peripheral surface of the flange portion 35 and the peripheral surface 38a of the second hole portion 38 is widened, the gap 41 (FIG. 3B) is increased, and air tends to flow excessively. As a result, the ratio of air in the water passage 27 increases, and there is a concern that air cannot be efficiently sucked.

  In view of this point, in the present embodiment, as shown in FIG. 4C, a notch 49 is formed in the peripheral portion of the flange portion 35 to partially reduce the overhanging dimension of the flange portion 35. Thereby, when the outer peripheral lip portion 54 is deformed in the formation region of the cutout portion 49, interference with the flange portion 35 is preferably avoided, while in the other region, the peripheral surface 38a of the second hole portion 38 and As a result, the air flow is moderately limited. With such a configuration, it is possible to avoid excessive air flow into the water passage 27 while ensuring an air flow path appropriately.

  Further, the air flowing in from the air inlet 43 passes through a gap 56 formed between the heel portion 53 of the lip packing 51 and the peripheral surface 38 a of the second hole portion 38, and enters the entire periphery of the lip packing 51. It comes to spread. Thereby, even when the notch 49 of the flange part 35 is not in a positional relationship facing the air inlet 43 side, air can be suitably guided to the formation region of the notch 49. That is, the air flow path can be suitably formed without requiring the circumferential positioning of the connection main body 21 and the passage forming member 22.

  After the air flow path is secured as described above, the outer peripheral lip 54 is pressed toward the inner peripheral lip 55 by the air flowing into the gap 60, and the deformed state of the outer peripheral lip 54 is maintained. Is done. Therefore, the air flow from the air inlet 43 toward the air outlet 44 is maintained without closing the gap 60.

  Next, a case where the operation handle 11a is in the open position and the water stop button 13b is in the water stop position will be described with reference to FIG. In this case, while water is supplied from the faucet 11, the water outlet 13a of the shower head 13 is closed, so that water loses its escape space between them, and the pressure in the flow channel 14 increases. Along with this, the pressure in the water passage 27 of the water flow adapter 15 also rises, and the water in the water passage 27 flows from the air outlet 44 into the air passage 46.

  The water that has flowed into the air passage 46 passes through the gaps 41, 42, and 57, and is then guided toward the groove 58 by the tapered portion 59 formed on the outer peripheral lip 54 of the lip packing 51, and flows into the groove 58. To do. As a result, the pressure in the groove 58 rises and becomes higher than the pressure on the air inlet 43 side, and the outer peripheral lip 54 is pressed against the peripheral surface 38 a of the second hole 38. Thereby, the space between the outer peripheral lip portion 54 and the peripheral surface 38a is sealed, and the air passage 46 is closed. Therefore, the backflow water that flows back through the air passage 46 is prevented from leaking out from the air inlet 43.

  Here, in the present embodiment, the air inlet 43 is configured to open at a height position of the heel portion 53 of the lip packing 51. In this case, the distance L from the front end of the outer peripheral lip 54 to the air inlet 43 becomes longer, and the seal by the outer lip 54 on the upstream side of the air inlet 43 (upstream as viewed in the flow of backflow water). A large area can be secured. As a result, the air passage 46 can be tightly closed in front of the air inlet 43, and the backflow water can be suitably prevented from reaching the air inlet 43.

  As mentioned above, according to this Embodiment explained in full detail, the following outstanding effects are acquired.

  The lip packing 51 is arranged in the air passage 46 so that the lip portion 52 is on the air outlet 44 side of the air passage 46. In this configuration, water is temporarily stopped by the water stop button 13b, and when the flow of water in the water passage 27 stops and a high pressure state is reached, water flows out from the water passage 27 to the air passage 46, and the air passage 46 The air outlet 44 side (water passage 27 side) has a higher pressure than the lip packing 51. In this case, the outer peripheral lip portion 54 is pressed against the peripheral surface 38a (passage wall of the air passage 46) of the second hole portion 38, the air passage 46 is closed, and leakage of backflow water is suppressed.

  On the other hand, in a state where water is flowing through the water passage 27, the air outlet 44 side has a negative pressure from the lip packing 51 of the air passage 46 due to the venturi effect. Further, since the gap 60 is formed between the outer peripheral lip portion 54 and the peripheral surface 38 a, the air flow in the air passage 46 is not hindered by the lip packing 51. As a result, air is drawn into the flowing water channel through the air passage 46, and the aerated water is discharged from the water discharge port 13a.

  Therefore, the structure of the air passage and the check structure is simpler than that of a conventional aeration structure that requires the incorporation of a ball valve in the air passage, and is suitable for downsizing.

  As the air passage 46, the first passage portion 46a that extends along the length direction of the water passage 27 and into which the air that has flowed into the air inflow port 43 is introduced, extends in a direction that intersects the length direction, and the first passage portion 46a. The second passage portion 46b for leading the air that has passed through the passage portion 46a to the air outlet 44 is provided, and the lip packing 51 is disposed in the first passage portion 46a so as to surround the water passage 27 in the circumferential direction.

  In this case, since the check structure is constructed in the length direction of the water passage 27, the intersection in the air passage is compared with the conventional aeration structure in which the check structure is constructed in the direction intersecting the length direction of the water passage. The dimension W (FIG. 2 (b)) in the direction to be reduced can be kept small. Thereby, the design freedom of the water passage 27 can be increased without increasing the outer diameter of the water passage adapter 15.

  That is, when the dimension W is increased, a region where the air passage 46 is formed in the radial direction of the water passage adapter 15 is widened toward the inside of the passage forming member 22, and accordingly, a region usable as the water passage 27 is narrowed. . As a result, the passage diameter of the water passage 27 is limited, and the design freedom may be reduced. In this case, it may be possible to secure the formation area of the air passage 46 by enlarging the outer diameter of the water flow adapter 15, but other water flow pipes (elbow pipe 11 b and shower hose 12) to which the water flow adapter 15 is connected. )), There is a limit to increasing the outer diameter of the water flow adapter 15.

  In this respect, in the present embodiment in which the dimension W can be reduced, it is possible to suppress the formation region of the air passage 46 from spreading toward the inside of the passage forming member 22, so that the water passage can be achieved without increasing the adapter outer diameter. As a result, a wide usable area can be secured. Therefore, the degree of freedom in designing the water passage 27 can be increased without enlarging the adapter outer diameter.

  A connection main body 21 in which a first through hole 24 penetrating in the direction of water flow of the water flow path 14 is formed, and a passage forming member 22 in which a water passage 27 for generating a venturi effect is formed. The passage forming member 22 can be attached in the through hole 24.

  As described above, since the function as the water passage 27 is integrated on the side of the passage forming member 22, the passage of the receiving portion 28, the throttle portion 29, and the outlet portion 30 in the water passage 27 can be performed by replacing only the passage forming member 22. The path diameter can be changed. That is, the water pressure on the faucet 11 side may differ depending on the specifications of the faucet 11, and in such a case, it is necessary to adjust the passage diameter of the receiving portion 28 or the like according to the water pressure of the faucet used. In this respect, the present embodiment can flexibly cope with such a situation.

  Moreover, since the function as a connection part (screw part 23a, 23b) with the faucet 11 and the shower hose 12 was concentrated on the connection main body 21 side, except for between the faucet 11 and the shower hose 12 by exchanging only the connection main body 21 It is possible to connect the water flow adapter 15 also to the location (for example, between the shower head 13 and the shower hose 12).

  The water passage adapter 15 can be separated into the connection main body 21 and the passage forming member 22, and an air passage is formed between the boundary portions (between the peripheral surface of the first through hole 24 and the outer edge of the passage forming member 22). A part of 46 (the first passage portion 46a and the second passage portion 46b) is formed, and the lip packing 51 is arranged in that portion.

  In this case, if the passage forming member 22 is separated from the connection main body 21, the lip packing 51 can be easily attached. Thereafter, when the passage forming member 22 to which the lip packing 51 is attached is inserted into the connection main body 21, the lip packing 51 is disposed in the air passage 46, so that the assembly can be completed by an extremely simple operation. That is, the assembly work can be facilitated even though the check valve is incorporated in the air passage. As a result, the assembly work can be simplified compared to a conventional aeration structure in which a long hole in the shape of a passage is formed to form an air passage, and a ball valve is inserted into the passage from the opening. Workability can be improved.

  In the present embodiment, the first passage portion 46a and the second passage portion 46b of the air passage 46 are formed at the boundary portion. However, from the viewpoint of ease of attaching the lip packing 51, at least the first passage portion 46a and the second passage portion 46b are formed. One passage portion 46a (more specifically, at least a portion where the lip packing 51 is disposed) may be formed at the boundary portion.

<Other embodiments>
The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  In the above embodiment, the lip packing 51 is attached to the passage forming member 22, but the lip packing 51 may be attached to the connection body 21 as shown in FIG. 7. In addition, when the said embodiment and the modification of FIG. 7 are compared, the said embodiment has the following advantages.

  In the configuration in which the lip packing 51 is attached to the connection main body 21, when the passage forming member 22 is extracted from the connection main body 21, the lip packing 51 remains on the connection main body 21 side (FIG. 7B), and the lip packing 51 is removed. It becomes difficult. On the other hand, in the configuration in which the lip packing 51 is mounted in the annular recess 36 of the passage forming member 22, the lip packing 51 can be easily taken out because the lip packing 51 is extracted together with the passage forming member 22. Thereby, the effort at the time of replacing | exchanging the channel | path formation member 22 is reduced, and workability | operativity improves.

  Moreover, in the above embodiment, since the lip packing 51 is fitted into the annular recess 36 and the lip packing 51 is held by the passage forming member 22, the lip packing 51 falls off during the extraction operation or the assembly operation. Is prevented. Thereby, workability can be further improved.

  In the above embodiment, when water flows through the water passage 27 and becomes negative pressure, the lip packing 51 is deformed so that the outer peripheral side lip portion 54 is separated from the peripheral surface 38a of the second hole portion 38. By forming the gap 60, the air flow from the air inlet 43 to the air outlet 44 is allowed. However, the negative pressure causes the pressing force against the peripheral surface 38a of the outer lip 54 to be increased. It is good also as a structure weakened (it becomes smaller than the closed state of the air passage 46). Even in this case, a gap can be generated by pushing the outer peripheral lip portion 54 in a state where the pressing force is reduced to the inner peripheral lip portion 55 side by air from the outside. Air flow to the outlet 44 can be allowed.

  In the embodiment described above, the aeration structure is configured separately from the shower head 13 and the shower hose 12. However, the structure is integrated and integrated in the connection part (a nipple or the like) of the shower head 13 or the shower hose 12. It is good.

  In the above-described embodiment, the aeration structure is applied to the shower device. However, for example, a cleaning device in which a nozzle head is connected to the tip of a hose or a watering device for gardening may be applied to devices other than the shower device. In this case as well, the air mixing structure is not limited to a separate body from the nozzle head and the hose, and may be configured to be incorporated in the nozzle head and the hose connection portion.

  DESCRIPTION OF SYMBOLS 13a ... Water outlet, 15 ... Water flow adapter (air mixing structure), 21 ... Connection main body (main body), 22 ... Passage formation member, 24 ... 1st through-hole (attachment hole), 27 ... Water passage, 28 ... Receiving part , 29 ... throttle part, 30 ... lead-out part, 36 ... annular recess, 38a ... peripheral surface (passage wall of air passage), 43 ... air inlet (inlet part), 44 ... air outlet (outlet part), 46 ... Air passage, 46a ... first passage portion, 46b ... second passage portion, 51 ... lip packing, 52 ... lip portion.

Claims (5)

A water passage that circulates water toward the spout and creates a venturi effect by the water flow;
An air passage having an inlet portion through which air can flow from the outside, and an outlet portion opened in the water passage;
With
An aeration structure that supplies external air drawn from the inlet portion due to the negative pressure due to the venturi effect to the water passage through the outlet portion, and allows aeration water to be discharged from the water outlet,
In the air passage, lip packing is arranged so that the lip portion is on the outlet portion side,
In the lip packing, when water in the water passage flows into the air passage, the lip portion is pressed against a passage wall of the air passage to close the air passage, while the water passage is opened to the water outlet. When the water is flowing toward the outlet, the negative pressure causes the lip portion and the passage wall to be separated from each other, or the pressing force of the lip portion against the passage wall is weakened. An aeration structure characterized by allowing air flow to the part. The air passage is
A first passage portion that extends in a length direction of the water passage and into which air that has flowed into the inlet portion is introduced;
A second passage portion extending in a direction crossing the length direction and leading the air that has passed through the first passage portion to the outlet portion;
With
The aeration structure according to claim 1, wherein the lip packing is disposed in the first passage portion so as to surround the water passage in a circumferential direction. A main body having a mounting hole penetrating in the flowing direction of the water passage;
A passage forming member configured to be detachable in the mounting hole, wherein the water passage is formed;
With
The water passage is
A receiving part for receiving water from the upstream side of the water passage;
A throttle portion communicating with the receiving portion and having a smaller passage diameter than the receiving portion;
A lead-out portion that communicates with the throttling portion and has a larger passage diameter than the throttling portion, and guides the water that has passed through the throttling portion to the spout side;
The aeration structure according to claim 1, comprising: The passage forming member has an annular recess that forms an annular shape surrounding the water passage in the circumferential direction and opens to the outside in the radial direction of the water passage,
The aeration structure according to claim 3, wherein the lip packing is attached to the annular recess.   The aeration structure according to claim 1, wherein the water outlet is a water outlet of a shower head.