Foaming Spout

Abstract

To provide a new foam discharge tool capable of forming a sufficient amount of foam even when a molding condition of a member is out of an ideal state.SOLUTION: A foam discharge tool 100 comprises: a base cap 1; two pumps; a jet ring 13 for holding a foam member which forms a confluence space G for joining forcibly-fed content fluid and air and foaming the mixed content fluid and air; and a nozzle head 14 for discharging the foamed content fluid outside. A pump 2 for a content fluid comprises a small diameter cylindrical body 4a, a hollow piston 5, and a hollow stem 7. A pump 3 for air comprises a large diameter cylindrical body 4b and an air piston 10. The air piston 10 is provided with an aperture 10d and a seal ring 10f. By pressing down the nozzle head 14, a lower part of a cylindrical part of the jet ring 13 is brought into contact with the seal ring 10f while sliding to suppress leakage of the air from the inside of the large diameter cylindrical body 4b, and a step part 4f is formed at an inner peripheral surface of the large diameter cylindrical body 4b.SELECTED DRAWING: Figure 1

Description

【Technical Field】 , 【0001】 The present disclosure relates to a foam ejector that ejects a mixture of a content liquid and air in a foamed state. 【Background Art】 【0002】 In containers filled with shampoo, body soap, hand soap, facial cleanser, etc., from the viewpoint of omitting the foaming operation of the content liquid and achieving convenient use, those equipped with a foam ejector that can directly foam and eject the content liquid in the container are widely used. 【0003】 Such a dispenser has a single cylinder in which a piston for sucking, pressurizing, and pumping the content liquid and an air piston for sucking, pressurizing, and pumping air are concentrically arranged on a base cap held at the mouth of the container. Then, by pressing the nozzle head to drive the pistons in each pump, the content liquid and air are respectively sucked into each cylinder and pressurized and pumped, and while the content liquid and air are mixed with each other in the confluence space on the outlet side of the pump, they are passed through a foaming member such as a mesh, so that the content liquid is ejected in a foamed state (see, for example, Patent Document 1). 【0004】 Also, instead of the check valve described in Patent Document 1, a container discharge tool with a reduced number of parts has been proposed, which is configured such that when the nozzle head is pressed, the lower part of the cylindrical portion of the jet ring slides and abuts against a seal ring provided on the air piston to suppress the leakage of air from the large-diameter cylinder (see, for example, Patent Document 2). 【Prior Art Documents】 【Patent Documents】 【0005】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2015-67354 【Patent Document 2】 Japanese Patent Application Laid-Open No. 2019-119480 【Summary of the Invention】 [Problems that the invention aims to solve] 【0006】 Incidentally, in the foam dispenser shown in Patent Document 2, if the sliding resistance between the cylindrical portion of the jet ring and the seal ring provided on the air piston becomes greater than expected due to the molding conditions of each component, the air piston slides smoothly downward within the large-diameter cylinder and compresses the air inside the cylinder. However, the seal between the cylindrical portion of the jet ring and the seal ring of the air piston becomes incomplete, and the compressed air inside the large-diameter cylinder may leak out to the outside. In such cases, the necessary air may not be supplied to the confluence space, and foam formation may not be sufficient, so there was room for improvement in this respect. 【0007】 This disclosure aims to solve these problems, and its objective is to provide a new foam dispenser that can form sufficient foam even when the molding conditions of the component deviate from the ideal state. [Means for solving the problem] 【0008】 To solve the above-mentioned problems, the foam dispenser of this disclosure is: [1] A foam dispenser comprising: a base cap attached to the mouth of the container body; two pumps suspended and held over the mouth of the container body by the base cap, which individually aspirate, pressurize, and pump the liquid contents and air; a jet ring that forms a confluence space for combining the liquid contents and air pumped from the pumps and holds a foaming member for foaming the mixed liquid contents and air; and a nozzle head attached to the jet ring for discharging the foamed liquid contents to the outside through an internal passage, A pump for aspirating, pressurizing, and pumping liquid contents comprises a small-diameter cylindrical body having a suction port at its bottom for allowing the liquid contents from the container body to flow in, a hollow piston that abuts against the inner surface of the small-diameter cylindrical body and pressurizes and pumps the liquid contents inside the small-diameter cylindrical body by sliding toward the bottom of the small-diameter cylindrical body, and a hollow stem connected to the hollow piston and having an inner passage through which the pumped liquid contents pass. A pump for drawing in, pressurizing, and pumping air comprises a large-diameter cylinder having a bottom connected to the small-diameter cylinder, and an air piston that abuts against the inner circumferential surface of the large-diameter cylinder and pressurizes and pumps air inside the large-diameter cylinder to send it to a first vent passage by sliding toward the bottom of the large-diameter cylinder, and the air piston is provided with a cylindrical guide that surrounds the hollow stem from the radially outer side and forms the first vent passage through which air passes between the hollow stem and the air piston, an opening for introducing air into the large-diameter cylinder, and a seal ring extending upward from the radially outer side of the opening. The jet ring comprises a cylindrical portion that surrounds the hollow stem from above and radially outward, forming a second ventilation passage between the hollow stem and the jet ring that connects to the confluence space, and when the nozzle head is pressed, the lower part of the cylindrical portion slides and contacts the seal ring to suppress air leakage from the large-diameter cylinder. The large-diameter cylindrical body is characterized by having a stepped portion formed on its inner circumferential surface that protrudes radially inward toward the downward direction. 【0009】 Furthermore, the foam dispenser of this disclosure is [2] In the configuration described in [1] above, it is preferable that the lower part of the cylindrical portion is provided with a first seal wall that abuts against the upper part of the cylindrical guide and connects the first ventilation passage and the second ventilation passage, and a second seal wall provided radially outward of the first seal wall and forming a seal with the seal ring when pressed by the nozzle head. 【0010】 Furthermore, the foam dispenser of this disclosure is [3] In the configuration described in [1] or [2] above, it is preferable that the upper end of the seal portion of the air piston is provided with a projection that bulges radially outward. [Effects of the Invention] 【0011】 According to this disclosure, a new foam dispenser can be provided that can form sufficient foam even when the molding conditions of the component deviate from the ideal state. [Brief explanation of the drawing] 【0012】 [Figure 1] This is a front cross-sectional view showing one embodiment of a foam dispenser according to this disclosure, attached to the mouth of a container body. [Figure 2] This is a detailed view of section A in Figure 1. [Figure 3] This is a front cross-sectional view showing the state in which the nozzle head is started to be pressed from the state in Figure 1. [Figure 4] This is a detailed view of section B in Figure 3. [Modes for carrying out the invention] 【0013】 Hereinafter, an embodiment of the foam dispenser 100 of this disclosure will be described in detail with reference to the drawings (Figures 1 to 4). Figure 1 is a cross-sectional view showing an embodiment of the foam dispenser 100 according to this disclosure, attached to the mouth of a container body C. In this embodiment, the foam dispenser 100 includes a base cap 1 attached to the mouth of a container body C, a liquid contents pump 2 and an air pump 3 that are suspended and held at the mouth of the container body C by the base cap 1 and individually suck, pressurize, and pump the liquid contents and air, respectively, a jet ring 13 that forms a confluence space G for combining the liquid contents and air pumped from the pumps and holds a mesh ring 12 that foams the mixed liquid contents and air, and a nozzle head 14 attached to the jet ring 13 and discharges the foamed liquid contents to the outside through an internal passage 14a. 【0014】 In this specification, claims, and drawings, the vertical direction refers to the upward and downward directions when the foam dispenser 100 is mounted on the container body C and in an upright position, as shown in Figure 1. Furthermore, the radially outward direction refers to the direction away from the central axis O of the foam dispenser 100 in Figure 1, along a straight line passing through the central axis O and perpendicular to the central axis O, while the radially inward direction refers to the direction toward the central axis O along the said straight line. 【0015】 In Fig. 1, reference numeral 1 denotes a base cap attached to the mouth of the container body C. The base cap 1 has an outer wall 1b hanging down from the edge of the top wall 1a, and is detachably attached by screwing the female screw portion provided inside the outer wall 1b onto the male screw portion provided at the mouth of the container body C. Note that other known configurations such as an undercut can also be used to attach the base cap 1 to the container body C. Further, a hollow neck portion 1c standing upward is provided at the center of the top wall 1a. On the inner peripheral surface of the hollow neck portion 1c, ribs 1e extending in the vertical direction are provided. Furthermore, a through hole 1f penetrating the top wall 1a and leading to the inside of the container is formed inside the hollow neck portion 1c. 【0016】 Reference numerals 2 and 3 denote two pumps that are suspended and held at the mouth of the container body C by the base cap 1 and suck, pressurize, and pump the content liquid and air individually. The content liquid pump 2 and the air pump 3 are formed by a single cylinder 4 having a configuration in which a small-diameter cylindrical body 4a and a large-diameter cylindrical body 4b having a bottom integrally connected to the upper part of the small-diameter cylindrical body 4a are coaxially arranged in series. Above the cylinder 4, a flange 4g extending radially outward is provided. When being suspended and held by the container body C, a packing PA is provided on the lower surface side of this flange 4g so as to sandwich the packing PA between the mouth of the container body C. 【0017】 Here, the content liquid pump 2 has a suction port 4c for allowing the content liquid in the container body C to flow in at the bottom of the small-diameter cylindrical body 4a. Further, at the edge of the suction port 4c, a fitting cylinder 4d for fitting and holding a suction pipe p extending toward the bottom of the container body C is provided. Further, inside the small-diameter cylindrical body 4a, a hollow piston 5 is arranged which abuts against the inner peripheral surface of the small-diameter cylindrical body 4a and is slidably provided along its axis, and a seal portion is provided at the lower part of the hollow piston 5. A poppet 6 is arranged in an internal passage t1 formed inside the hollow piston 5. Here, the upper part of the hollow piston 5 forms a reduced-diameter portion 5a with a reduced inner diameter. Further, the poppet 6 has a valve portion 6a at its lower end for opening and closing the suction port 4c, and a valve portion 6b at its upper end for opening and closing the outlet of the internal passage t1. And, a hollow stem 7 is arranged outside the hollow piston 5. The hollow stem 7 includes a lower cylindrical wall 7a surrounding the hollow piston 5, an intermediate flange 7b integrally connected at the upper part of the lower cylindrical wall 7a, and an upper cylindrical wall 7c standing up from the intermediate flange 7b and protruding from the through-hole 1f of the base cap 1. An inner passage t2 communicating with the internal passage t1 is formed inside the upper cylindrical wall 7c. Further, a spring 8 is arranged between the lower part of the poppet 6 and the lower part of the hollow piston 5. Thereby, the hollow piston 5 and the hollow stem 7 are elastically supported slidably. Further, a plurality of ribs 7c1 extending in the vertical direction are provided on the outer peripheral surface of the upper cylindrical wall 7c as shown in FIG. 2. 【0018】 As shown in FIG. 2, the above-described intermediate flange 7b protrudes radially outward from the outer peripheral surface of the upper cylindrical wall 7c. Further, an intermediate annular wall 7d standing up from the upper surface of the intermediate flange 7b is provided. Thereby, a recessed space S1 that is open upward is partitioned and formed by the outer peripheral surface of the upper cylindrical wall 7c, the intermediate flange 7b, and the intermediate annular wall 7d. 【0019】 As shown in Figure 1, an inward flange 7g is provided on the upper part of the upper cylindrical wall 7c, extending radially inward and with its inner end extending upward. Above the inward flange 7g, a ball valve B is positioned, with the inner end of the inward flange 7g serving as the valve seat. The ball valve B is prevented from coming out upward by a cover portion 13g provided on the jet ring 13. The cover portion 13g has a central opening 13g1 through which the liquid contents pass in the radial center. 【0020】 As shown in Figure 1, the air pump 3 is equipped with an air piston 10 that abuts against the inner circumferential surface of the large-diameter cylindrical body 4b and is slidably mounted along its axis. A cylindrical guide 10a surrounding the hollow stem 7 is provided radially inside the air piston 10, and as shown in Figure 2, the gap formed between the outer circumferential surface of the hollow stem 7 and the inner circumferential surface of the cylindrical guide 10a is a first ventilation passage A1 that allows air to pass through and is located above the recessed space S1. In the initial position, the lower end of the cylindrical guide 10a is configured to abut against at least one of the intermediate flange 7b and the intermediate annular wall 7d. Furthermore, as will be described later, the hollow stem 7 is slightly slidable relative to the air piston 10, and the lower end of the cylindrical guide 10a functions as a valve that opens and closes the first ventilation passage A1 by abutting against and separating from the intermediate flange 7b or the intermediate annular wall 7d. Furthermore, the partition wall 10c, which extends radially outward from the cylindrical guide 10a and forms a space for pressurizing air between it and the large-diameter cylindrical body 4b, is provided with an opening 10d for introducing air into the large-diameter cylindrical body 4b. A seal ring 10f extending upward is provided radially outward from the opening 10d. The seal ring 10f forms a seal by sliding and contacting the second seal wall 13f formed at the lower part of the cylindrical portion (lower cylindrical portion 13a) of the jet ring 13 when the nozzle head 14 is pressed, thereby suppressing air leakage from inside the large-diameter cylindrical body 4b. The cylindrical guide 10a also forms a seal by sliding and contacting the first seal wall 13e formed at the lower part of the cylindrical portion (lower cylindrical portion 13a) of the jet ring 13, thereby connecting the first ventilation passage A1 and the second ventilation passage A2. 【0021】 In this embodiment, through ribs 13f1 are intermittently arranged in the circumferential direction on the radially inner surface of the second seal wall 13f. With this configuration, although the second seal wall 13f and the seal ring 10f are in contact with each other in the state before the nozzle head 14 shown in Figure 2 is pushed down, air can be introduced into the large-diameter cylindrical body 4b through the space between the through ribs 13f1 and the opening 10d. 【0022】 As shown in Figure 1, a nozzle head 14 is provided above the hollow stem 7, which foams the mixed liquid contents and air using a foaming member (mesh ring 12) located inside the stem and discharges it to the outside through an internal passage 14a. In this embodiment, the nozzle head 14 holds the mesh ring 12 via a jet ring 13. 【0023】 In this embodiment, the mesh ring 12 has a mesh 12a attached to one end of a ring-shaped main body. In this embodiment, a total of two mesh rings 12 are attached to the jet ring 13 so that the mesh 12a of each ring faces outwards (the side without mesh 12a forms the joint). 【0024】 As shown in Figure 1, the jet ring 13 has a cylindrical portion (lower cylindrical portion 13a) that surrounds the upper cylindrical wall 7c of the hollow stem 7. A first seal wall 13e is provided at the lower end of the cylindrical portion (lower cylindrical portion 13a) that surrounds the upper end of the cylindrical guide 10a, and a second ventilation passage A2 leading to the first ventilation passage A1 is formed between the upper cylindrical wall 7c and the lower cylindrical portion 13a. The second ventilation passage A2 is formed between the hollow stem 7 (upper cylindrical wall 7c) and the cylindrical portion (lower cylindrical portion 13a) that surrounds the hollow stem 7 from above and radially outward, and supplies air pressurized from the first ventilation passage A1 into the confluence space G, which will be described later (see Figure 1). The jet ring 13 also has an enlarged diameter portion 13b that is connected to the lower cylindrical portion 13a, covers the upper part of the hollow stem 7, and supports the mesh ring 12 from below. Between the cover portion 13g and the inward flange 7g, a confluence space G is formed between the liquid contents from the inner passage t2 and the air flowing in from the second ventilation passage A2. Furthermore, above the enlarged diameter portion 13b, an upper cylindrical portion 13c is provided that surrounds and holds the mesh ring 12. 【0025】 As shown in Figure 1, the nozzle head 14 comprises a nozzle head body portion 14b having an internal passage 14a for flowing the liquid contents, and a head ring 14c that is located radially outward of the hollow neck portion 1c of the base cap 1 when the nozzle head 14 is pressed down. 【0026】 The nozzle head body portion 14b is provided with an internal cylindrical wall 14d on its inner surface that fits and holds the upper cylindrical portion 13c, and a rib 14e that prevents the mesh ring 12 attached to the jet ring 13 from coming out upward. Furthermore, the outer edge of the nozzle head body portion 14b is provided with an edge wall 14g that surrounds the upper part of the head ring 14c. 【0027】 Although not shown in the figure, a stopper may be provided between the top wall 1a of the base cap 1 and the head ring 14c to prevent the nozzle head 14 from being unintentionally pushed down. The stopper may be, for example, roughly C-shaped in plan view and can be attached detachably from the side of the hollow neck portion 1c. 【0028】 In the foam dispenser 100 configured in this way, when the stopper (not shown) is removed and the nozzle head 14 is pushed in, the jet ring 13 and the hollow stem 7 connected to the jet ring 13 slide slightly downward relative to the air piston 10 by the dimension L shown in Figure 2. In other words, the sliding of the air piston 10 starts later than the sliding of the hollow stem 7 by the dimension L. Ideally, when the downward sliding of the air piston 10 begins, the second seal wall 13f and the seal ring 10f shown in Figure 2 should come into contact as shown in Figures 3 and 4 to form a seal, preventing air from leaking out of the large-diameter cylindrical body 4b through the opening 10d. However, if the sliding resistance between the second seal wall 13f and the seal ring 10f becomes greater than the sliding resistance between the seal portion 10g of the air piston 10 and the inner surface of the large-diameter cylindrical body 4b due to the molding conditions of each component, the air piston 10 may begin to descend inside the large-diameter cylindrical body 4b even though the seal between the second seal wall 13f and the seal ring 10f is not complete. In this case, since the air inside the large-diameter cylindrical body 4b is compressed even though the seal between the second seal wall 13f and the seal ring 10f is not complete, the air inside the large-diameter cylindrical body 4b may leak out through the opening 10d, and the pressure inside the large-diameter cylindrical body 4b may not rise sufficiently, resulting in insufficient air being pumped into the confluence space G. 【0029】 In this embodiment, a stepped portion 4f is formed on the inner circumferential surface of the large-diameter cylindrical body 4b, projecting radially inward toward downward (see Figures 2 and 4). That is, the inner circumferential surface of the large-diameter cylindrical body 4b protrudes radially inward more at the lower part than at the upper part, with the stepped portion 4f as the boundary. Note that in Figures 2 and 4, the stepped portion 4f is intentionally depicted as larger horizontally than the thickness of the wall surface of the large-diameter cylindrical body 4b. The stepped portion 4f may be configured to incline radially inward toward downward as shown in the figures, or it may project horizontally radially inward. With this configuration, even if the sliding resistance between the second seal wall 13f and the seal ring 10f is greater than the sliding resistance between the seal portion 10g of the air piston 10 and the inner surface of the large-diameter cylindrical body 4b, and the air piston 10 begins to descend within the large-diameter cylindrical body 4b while the seal between the second seal wall 13f and the seal ring 10f is not complete, the upper end of the seal portion 10g of the air piston 10 engages with the stepped portion 4f on the inner surface of the large-diameter cylindrical body 4b, temporarily stopping the descent of the seal portion 10g. As a result, even if the sliding resistance between the second seal wall 13f and the seal ring 10f is large, after the nozzle head 14 is further pushed in and the seal between the second seal wall 13f and the seal ring 10f becomes complete, the engagement between the upper end of the seal portion 10g and the stepped portion 4f of the large-diameter cylindrical body 4b is disengaged, and the compression of air within the large-diameter cylindrical body 4b is resumed. Therefore, it is possible to suppress the problem of air inside the large-diameter cylindrical body 4b leaking out to the outside through the opening 10d when the air inside the large-diameter cylindrical body 4b is compressed while the seal between the second seal wall 13f and the seal ring 10f is not complete. 【0030】 Furthermore, it is preferable to provide a projection 10g1 that bulges radially outward at least the upper end of the sealing portion 10g of the air piston 10, as shown in Figures 2 and 4. This configuration allows the lower part of the projection 10g1 to temporarily and more reliably engage with the stepped portion 4f formed on the inner circumferential surface of the large-diameter cylindrical body 4b. 【0031】 As the nozzle head 14 is pressed, the lower end of the cylindrical guide 10a separates from the intermediate flange 7b, as shown in Figures 3 and 4, and the inside of the air piston 10 communicates with the first ventilation passage A1. Furthermore, as the nozzle head 14 is pushed in, the movement of the air piston 10 causes the pressurized air inside the air piston 10 to be introduced from the first ventilation passage A1 into the second ventilation passage A2 and flow toward the merging space G. 【0032】 Meanwhile, in the small-diameter cylinder 4a, when the nozzle head 14 is pressed, the hollow stem 7 and hollow piston 5 move downward, causing the valve portion 6a of the poppet 6 to contact the inner surface of the small-diameter cylinder 4a, closing the suction port 4c and pressurizing the inside of the small-diameter cylinder 4a. Further pressing of the nozzle head 14 causes the valve portion 6b of the poppet 6 to separate from the outlet of the internal passage t1 in the hollow piston 5, and the liquid contents present in the internal passage t1 are pumped into the inner passage t2 of the hollow stem 7. Then, due to the internal pressure in the inner passage t2, the ball valve B separates upward from the inward flange 7g and the valve opens, so the pumped liquid contents flow into the confluence space G. 【0033】 Then, the liquid contents, which have become a gas-liquid mixture in the confluence space G, pass through the mesh ring 12 to become foamy and are discharged to the outside through the internal passage 14a of the nozzle head 14. 【0034】 After fully pushing the nozzle head 14, when the force applied to the pushing is removed, the hollow piston 5 and hollow stem 7 return to their initial positions due to the repulsive force of the spring 8. 【0035】 During this recovery process, the poppet 6 moves in conjunction with the upward sliding of the hollow piston 5, opening the suction port 4c of the small diameter cylinder 4a, and the ball valve B seats on the inward flange 7g, creating negative pressure inside the small diameter cylinder 4a, which in turn draws the liquid contents of the container body C into the small diameter cylinder 4a through the suction port 4c. 【0036】 On the other hand, in the large-diameter cylindrical body 4b, the upward sliding of the air piston 10 begins later than that of the hollow piston 5 and hollow stem 7, so the first ventilation passage A1 is closed when the lower end of the cylindrical guide 10a abuts against the intermediate flange 7b. Also, because the jet ring 13 moves upward before the air piston 10 in conjunction with the hollow stem 7, the seal between the second seal wall 13f and the seal ring 10f is released again. As a result, when the air piston 10 begins to slide upward, the inside of the air piston 10 (the area below the partition wall 10c in the large-diameter cylindrical body 4b) becomes negative pressure, and air flows into the inside of the air piston 10 through the gap between the head ring 14c and the internal cylindrical wall 14d, the inside of the hollow neck 1c of the base cap 1, the gap between the second seal wall 13f and the seal ring 10f, and the opening 10d. Furthermore, as shown in Figure 1, a lateral hole 4e is provided at the top of the large-diameter cylindrical body 4b, and air that passes inside the hollow neck portion 1c of the base cap 1 also flows into the container body C through the lateral hole 4e. As a result, even if the liquid contents are discharged from inside the container body C, the inside of the container body C will not remain under negative pressure. Although not shown, an opening may also be provided in the upper outer wall of the head ring 14c to allow air to be drawn into the air pump 3. 【0037】 By repeatedly pushing in and returning the nozzle head 14 to its initial position in this manner, the liquid contents inside the container body C can be continuously dispensed in a foamy form. 【0038】 As described above, this embodiment includes a base cap 1 attached to the mouth of the container body C, two pumps suspended and held at the mouth of the container body C by the base cap 1, which individually suck, pressurize, and pump the liquid contents and air, a jet ring 13 that forms a confluence space G for combining the liquid contents and air pumped from the pumps and holds a foaming member (mesh ring 12) that foams the mixed liquid contents and air, and an internal passage 14 attached to the jet ring 13 for the foamed contents A foam dispenser 100 is equipped with a nozzle head 14 that discharges to the outside through a, and a pump (pump for contents 2) for sucking, pressurizing, and pumping the contents is equipped with a small diameter cylindrical body 4a having a suction port 4c at the bottom for letting the contents of the container body C into it, a hollow piston 5 that abuts the inner circumferential surface of the small diameter cylindrical body 4a and pressurizes and pumps the contents of the small diameter cylindrical body 4a by sliding toward the bottom of the small diameter cylindrical body 4a, and a hollow stem 7 connected to the hollow piston 5 and having an inner passage t2 through which the pumped contents pass, and for air suction, The pump (air pump 3) used for pressurizing and pumping includes a large-diameter cylindrical body 4b having a bottom connected to a small-diameter cylindrical body 4a, and an air piston 10 that contacts the inner circumferential surface of the large-diameter cylindrical body 4b and pressurizes and pumps the air inside the large-diameter cylindrical body 4b by sliding toward the bottom of the large-diameter cylindrical body 4b to send air to the first ventilation passage A1. The air piston 10 includes a cylindrical guide 10a that surrounds the hollow stem 7 and forms the first ventilation passage A1 through which air passes between the hollow stem 7 and the air piston 10, an opening 10d for introducing air into the large-diameter cylindrical body 4b, and the diameter of the opening 10d A seal ring 10f is provided extending upward from the outward side, and the jet ring 13 has a cylindrical portion (lower cylindrical portion 13a) that surrounds the hollow stem 7 from above and radially outward, forming a second ventilation passage A2 that connects to a confluence space G between the hollow stem 7 and the jet ring 13. When the nozzle head 14 is pressed, the lower part of the cylindrical portion slides and contacts the seal ring 10f to suppress air leakage from inside the large diameter cylindrical body 4b, and a stepped portion 4f is formed on the inner circumferential surface of the large diameter cylindrical body 4b that protrudes radially inward toward the downward side.With this configuration, even if the sliding resistance between the second seal wall 13f and the seal ring 10f is greater than the sliding resistance between the seal portion 10g of the air piston 10 and the inner surface of the large-diameter cylindrical body 4b, and the air piston 10 begins to descend within the large-diameter cylindrical body 4b while the seal between the second seal wall 13f and the seal ring 10f is not complete, the upper end of the seal portion 10g of the air piston 10 engages with the stepped portion 4f on the inner surface of the large-diameter cylindrical body 4b, temporarily stopping the descent of the seal portion 10g. As a result, even if the sliding resistance between the second seal wall 13f and the seal ring 10f is large, after the nozzle head 14 is further pushed in and the seal between the second seal wall 13f and the seal ring 10f becomes complete, the engagement between the upper end of the seal portion 10g and the stepped portion 4f of the large-diameter cylindrical body 4b is disengaged, and the compression of air within the large-diameter cylindrical body 4b is resumed. Therefore, the problem of air leaking out of the large-diameter cylindrical body 4b through the opening 10d due to compression of air inside the large-diameter cylindrical body 4b when the seal between the second seal wall 13f and the seal ring 10f is not complete can be suppressed. Consequently, even if the molding conditions of the component deviate from the ideal state and the sliding resistance between the second seal wall 13f and the seal ring 10f becomes large, sufficient bubbles can be formed. 【0039】 In this embodiment, the lower part of the cylindrical portion (lower cylindrical portion 13a) is provided with a first seal wall 13e that abuts against the upper part of the cylindrical guide 10a to connect the first air passage A1 and the second air passage A2, and a second seal wall 13f provided radially outside the first seal wall 13e that slides against the seal ring 10f when pressed by the nozzle head 14 to form a seal. By adopting this configuration, the connection between the first air passage A1 and the second air passage A2 is made secure by the first seal wall 13e, and a seal can be formed by sliding the second seal wall 13f against the seal ring 10f. This ensures that the air inside the large-diameter cylindrical body 4b is reliably pumped to the confluence space G when pressed by the nozzle head 14, and that the opening 10d is opened and closed in a timely manner. 【0040】 In this embodiment, the upper end of the seal portion 10g of the air piston 10 is provided with a projection 10g1 that bulges radially outward. By adopting this configuration, when the nozzle head 14 is pressed down, the lower part of the projection 10g1 temporarily and more reliably engages with the stepped portion 4f formed on the inner circumferential surface of the large-diameter cylindrical body 4b, thereby making the seal between the second seal wall 13f and the seal ring 10f more complete. 【0041】 While this disclosure has been described based on various drawings and embodiments, it should be noted that those skilled in the art will find it easy to make various modifications and alterations based on this disclosure. Therefore, it should be noted that these modifications and alterations are included within the scope of the present invention. For example, the functions included in each component can be rearranged in a logically consistent manner, and multiple components can be combined into one or separated. It should be understood that these are also included within the scope of the present invention. 【0042】 For example, in this embodiment, the air piston 10 is configured to have a projection 10g1 that bulges radially outward at the upper end of the seal portion 10g, but the embodiment is not limited to this configuration, and a configuration without the projection 10g1 is also possible. [Industrial applicability] 【0043】 According to this disclosure, a new foam dispenser 100 can be provided that can form sufficient foam even when the molding conditions of the component deviate from the ideal state. [Explanation of symbols] 【0044】 1 Base cap 1a Top wall 1b Exterior wall 1c hollow neck 1e Rib 1f through hole 2. Pump for liquid contents (pump) 3. Air pump (pump) 4 cylinders 4a Small diameter cylinder 4b Large diameter cylinder 4c suction port 4d mating tube 4e horizontal hole 4th floor section 4g flange 5 Hollow piston 5a Reduced diameter part 6 Poppet 6a Valve 6b Valve part 7 Hollow stem 7a Lower tubular wall 7b Intermediate flange 7c Upper cylindrical wall 7c1 Rib 7d Intermediate ring wall 7g Inward Flange 8 springs 10 Air Pistons 10a Cylindrical guide 10c bulkhead 10d hole 10f sealing ring 10g seal portion 10g1 protrusion 12 Mesh ring (foam material) 12a mesh 13 Jet Ring 13a Lower cylindrical section (cylindrical part) 13b Expanded diameter part 13c Upper cylinder part 13e First Seal Wall 13f Second seal wall 13f1 Through Rib 13g Cover part 13g1 center opening 14 Nozzle heads 14a Internal passage 14b Nozzle head main body 14c head ring 14d Internal cylindrical wall 14e Rib 14g edge wall 100 foam dispenser A1 First ventilation channel A2 Second ventilation channel B Ball valve C Container body G Confluence space O center axis p suction pipe PA packing S1 Recessed space t1 Internal passage t2 inner passage

Claims

[Claim 1] A foam dispenser comprising: a base cap attached to the mouth of the container body; two pumps suspended and held over the mouth of the container body by the base cap, which individually aspirate, pressurize, and pump the liquid contents and air; a jet ring that forms a confluence space for the liquid contents and air pumped from the pumps to merge and holds a foaming member for foaming the mixed liquid contents and air; and a nozzle head attached to the jet ring for discharging the foamed liquid contents to the outside through an internal passage, A pump for aspirating, pressurizing, and pumping liquid contents comprises a small-diameter cylindrical body having a suction port at its bottom for allowing the liquid contents from the container body to flow in, a hollow piston that abuts against the inner surface of the small-diameter cylindrical body and pressurizes and pumps the liquid contents inside the small-diameter cylindrical body by sliding toward the bottom of the small-diameter cylindrical body, and a hollow stem connected to the hollow piston and having an inner passage through which the pumped liquid contents pass. A pump for drawing in, pressurizing, and pumping air comprises a large-diameter cylinder having a bottom connected to the small-diameter cylinder, and an air piston that abuts against the inner circumferential surface of the large-diameter cylinder and pressurizes and pumps air inside the large-diameter cylinder to send it to a first vent passage by sliding toward the bottom of the large-diameter cylinder, and the air piston is provided with a cylindrical guide that surrounds the hollow stem from the radially outer side and forms the first vent passage through which air passes between the hollow stem and the air piston, an opening for introducing air into the large-diameter cylinder, and a seal ring extending upward from the radially outer side of the opening. The jet ring comprises a cylindrical portion that surrounds the hollow stem from above and radially outward, forming a second ventilation passage between the hollow stem and the jet ring that connects to the confluence space, and when the nozzle head is pressed, the lower part of the cylindrical portion slides and contacts the seal ring to suppress air leakage from the large-diameter cylinder. A foam dispenser having a stepped portion formed on the inner circumferential surface of the large-diameter cylindrical body, which protrudes radially inward toward the downward direction. [Claim 2] The foam dispenser according to claim 1, wherein the lower part of the cylindrical portion is provided with a first seal wall that abuts against the upper part of the cylindrical guide and connects the first ventilation passage and the second ventilation passage, and a second seal wall provided radially outward of the first seal wall and forming a seal with the seal ring when pressed by the nozzle head. [Claim 3] The foam dispenser according to claim 1 or 2, wherein the upper end of the seal portion of the air piston is provided with a projection that bulges radially outward.

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