JP2008174268A - Inside stopper for chemical liquid vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent, e.g., dropping of a chemical liquid in a large quantity as well as adsorption of the components of a chemical liquid, and to eliminate the durability problem of a mold for forming an inside stopper. <P>SOLUTION: The inside stopper is a combination of an inner cylinder 10 made of a hard synthetic resin, which has a flange 12 fittable in the mouth 31 of the container 30, and an outer cylinder 20 made of a soft synthetic resin having an upward dropping nozzle 23. In the area where the inner cylinder 10 and outer cylinder 20 come into contact with each other, a regulating means is formed for regulating resistance of a passage extending from the inside of the container 30 to the dropping nozzle 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an internal stopper for a chemical solution container suitable for use in which a predetermined amount of chemical solution is dropped as a droplet, such as eye drops, drops, titration reagents, and the like.

  When a chemical solution is dropped as a droplet, it is necessary to appropriately control the size of each droplet. Therefore, it has been proposed to arrange a throttle device having an effective cross-sectional area smaller than the inlet cross-sectional area of the base of the conical dripping nozzle at the lower part of the dripping nozzle (for example, Patent Document 1).

  In this proposal, a partition wall having a flow hole having a cross-sectional area smaller than the inlet cross-sectional area of the dropping nozzle is provided below the dropping nozzle of the inner stopper attached to the mouth of the container, and an intermediate chamber is provided between the dropping nozzle and the partition wall. Is provided. Therefore, this liquid can always drop liquid droplets of an appropriate size from the dropping nozzle by supplying the liquid chemical in the container to the dropping nozzle very little by little through the flow hole of the partition wall. It is possible to prevent problems such as inadvertently flowing out in a stream, generation of extremely large droplets, or continuous generation of a large number of droplets. These defects are known as so-called “dropping” and “liquid running”.

On the other hand, some chemical components cause adsorption by soft synthetic resin, and the inner plug made of hard synthetic resin and the outer tube made of soft synthetic resin are suitable for the inner stopper of the chemical solution container that stores this kind of chemical solution. (Patent Document 2). In this case, by providing a constricted portion at the bottom of the inner cylinder, “dropping off” of the chemical solution is prevented.
Special table 2004-529827 gazette Japanese Patent No. 3008219

  When such a conventional technique is used, the flow hole provided in the partition wall or the narrowed portion at the bottom of the inner cylinder is a micro hole having an extremely small cross-sectional area, and therefore, a pin-shaped projection having a small diameter is provided on one of the divided molds for molding. It must be placed and abutted against the other side of the mold, so that the pin-shaped projections break or wear, and the durability of the mold is reduced, so that the production cost tends to be excessive. There was a problem.

  Therefore, in view of the problems of the prior art, the object of the present invention is to prevent the adsorption of the chemical component, and to solve the problem of the durability of the mold for molding without any trouble such as dropping of the chemical solution. An object of the present invention is to provide an inner stopper of a chemical solution container.

  In order to achieve such an object, the structure of the present invention has a hard synthetic resin inner cylinder with a flange fitted to the mouth of the container, an upward dripping nozzle, and covers the upper part of the flange. And an outer cylinder made of a soft synthetic resin to be combined with the inner cylinder, and at the contact portion of the inner cylinder and the outer cylinder, a regulating means for regulating the flow path resistance of the flow path from the inside of the container to the dropping nozzle is formed. The gist is to do.

  The restricting means may be an outlet of an outer cylinder that is reduced in diameter through a tapered portion at the upper end of the inner cylinder, or may be an outlet of an inner cylinder or an outer cylinder that is eccentric and partially overlap each other. It is good also as a shallow groove | channel which forms and connects the outflow port of an inner cylinder and an outer cylinder, and it is good also as a shallow recessed part which forms in an outer cylinder and connects the outflow port of an inner cylinder and an outer cylinder.

  According to the configuration of the invention, the inner cylinder made of the hard synthetic resin prevents the chemical liquid in the container from coming into contact with the outer cylinder made of the soft synthetic resin and prevents the adsorption of the chemical liquid components, while the inner cylinder made of the soft synthetic resin The outer cylinder acts as a packing when the inner cylinder is mounted on the mouth of the container, and the dripping nozzle can be reliably sealed by the cap. In addition, the restricting means formed at the contact portion of the inner cylinder and the outer cylinder is configured to restrict the flow resistance of the flow path from the inside of the container to the dropping nozzle to an appropriate size, thereby dropping the chemical solution and running the liquid. Prevent such as. The inner shape of the upper end of the outer cylinder is adapted to the outer shape of the upper end of the inner cylinder. Therefore, the contact portion of the inner cylinder and the outer cylinder has the upper end of the inner cylinder at the upper end of the outer cylinder. It shall be formed by close contact. In addition, the inner cylinder and the outer cylinder are opened at the contact portion of the inner cylinder and the outer cylinder through the inner space of the inner cylinder and the outlet on the outer cylinder side communicating with the dropping nozzle, respectively. Both outlets are part of the flow path from the inside of the container to the dropping nozzle.

  By restricting the outlet of the outer cylinder to be reduced in diameter through the tapered portion of the inner cylinder, the outlet of the outer cylinder before the diameter reduction can be made sufficiently large, and the durability of the mold is unreasonably set. There is no risk of lowering. However, the outlet of the outer cylinder before diameter reduction can be molded sufficiently stably if the diameter is about 0.4 mm or more, for example, by reducing the diameter to about 0.2 mm or less, Problems such as dropping off can be prevented.

  The regulating means eccentrically sets the outlets of the inner and outer cylinders to each other and restricts the overlapping portion to an effective diameter of, for example, about 0.2 mm or less, so that the diameter of each outlet is set large so that it can be stably molded. However, it is possible to prevent problems such as dropping off.

  The restricting means can prevent problems such as dropping off by connecting the outlets of the inner cylinder and the outer cylinder through shallow grooves formed in the inner cylinder. This is because the shallow groove can realize a sufficiently large flow path resistance by reducing the effective cross-sectional area and setting the communication distance between the outlets of the inner cylinder and the outer cylinder to be long. The outlet of the outer cylinder is opened on the common axis of the outer cylinder and the inner cylinder, and the outlet of the inner cylinder is not overlapped with the outlet of the outer cylinder, so It is preferable to open to the side.

  The restricting means can prevent problems such as dropping off by connecting the outlets of the inner cylinder and the outer cylinder through a shallow recess formed in the outer cylinder. This is because the concave portion can realize a necessary and sufficiently large flow path resistance by reducing the effective cross-sectional area and setting the communication distance between the outlets of the inner cylinder and the outer cylinder to be long. The outlet of the outer cylinder is opened on the common axis of the outer cylinder and the inner cylinder, the shallow recess is formed in a circular shape concentric with the outlet of the outer cylinder, and the outlet of the inner cylinder is a shallow recess. It is preferable to form it on the upper end surface of the inner cylinder so as to be included in the range.

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

  The inner stopper of the chemical solution container is formed by combining the inner cylinder 10 made of hard synthetic resin and the outer cylinder 20 made of soft synthetic resin (FIGS. 1 and 2), and is inserted into the mouth portion 31 of the container 30.

  The container 30 is, for example, a hollow flat container whose dimension perpendicular to the paper surface is smaller than the dimension parallel to the paper surface of FIG. The container 30 has a circular mouth 31 at the top, and is integrally formed of a hard synthetic resin such as polyethylene terephthalate. The container 30 has diagonal shoulders 32, 32 symmetrically formed on the left and right sides of the mouth portion 31, and locking protrusions 33, 33 are formed on the left and right outer sides of the mouth portion 31 in the horizontal direction.

  The inner cylinder 10 is a cylindrical member having a downward engaging projection 11 on the upper outer periphery and an upward flange 12 on the lower outer periphery. In addition, the outer diameter of the upper part of the engagement protrusion 11 is slightly thinner than the outer diameter between the engagement protrusion 11 and the collar part 12, and the outer diameter of the lower part of the collar part 12 decreases smoothly downward. is doing. Inside the inner cylinder 10, an upper tapered portion 13 that opens upward, an outlet 14 at the bottom of the tapered portion 13, and a stepped internal space 15 that opens downward are axially centered in order from the top to the bottom. C is formed. However, the outflow port 14 is set to have a diameter of about 0.4 mm or more that can be stably molded, and is positioned above the engaging protrusion 11.

  The outer cylinder 20 is a cylindrical member having a flange 21 at the outer peripheral intermediate portion. The upper end portion of the outer cylinder 20 is smoothly rounded, and a skirt portion 22 having a thin portion 22 a at the lower end portion is formed at the lower portion of the flange 21. Inside the outer cylinder 20, a dripping nozzle 23 at the upper end that spreads upward, a conical fin portion 24 that extends downward from the lower portion of the dripping nozzle 23, and a portion above the collar portion 12 of the inner cylinder 10. An insertable internal space 25 is formed on the axis C in order from the top to the bottom. Note that an outlet 26 is opened at the lower end of the fin portion 24, and an engaging recess 27 is formed in the circumferential direction at a position corresponding to the flange 21 in the intermediate portion of the internal space 25.

  Therefore, the outer cylinder 20 can be integrally combined on the axis C common to the inner cylinder 10 so as to cover the flange 12 of the inner cylinder 10 (two-dot chain line in FIG. 2). The upper portion of the flange portion 12 is inserted into the inner space 25 and the inner cylinder 10 is prevented from being pulled out by engaging the engagement protrusion 11 with the engagement recess 27. Further, the upper end portion of the inner cylinder 10 is in close contact with the upper end portion inside the outer cylinder 20, and the fin portion 24 and the outlet 26 of the outer cylinder 20 are elastically contracted via the tapered portion 13 of the inner cylinder 10. Diameter. In addition, the diameter of the outflow port 26 shall be about 0.4 mm or more which can be shape | molded stably in a free state, and shall be diameter-reduced to about 0.2 mm or less.

  The inner cylinder 10 and the outer cylinder 20 combined in this way can be press-fitted into the mouth portion 31 of the container 30 via the flange 12 of the inner cylinder 10 (FIG. 1). That is, the flange portion 12 can be fitted into the mouth portion 31 in a water-tight manner, the flange 21 of the outer tube 20 abuts on the upper end surface of the mouth portion 31, and the skirt portion 22 is formed in the inner tube within the mouth portion 31. Acts as 10 packing. Further, the outlet 26 of the outer cylinder 20 reduced in diameter via the taper portion 13 of the inner cylinder 10 passes from the inside of the container 30 to the dropping nozzle 23 of the outer cylinder 20 at the contact portion of the inner cylinder 10 and the outer cylinder 20. It is a regulating means that regulates the flow resistance of the distribution channel to reach. The outlet 26 after the diameter reduction has realized the minimum cross-sectional area of the flow path from the inside of the container 30 communicating with the inner space 15 of the inner cylinder 10 and the outlets 14 and 26 to the dropping nozzle 23. is there.

  The inner cylinder 10 is integrally formed of, for example, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyarylate, or the like. Further, the outer cylinder 20 is integrally formed of, for example, polyethylene or polypropylene.

  A cap 40 is attached to the container 30. The cap 40 is formed in a flat box shape with an open bottom, with a size parallel to the paper surface of FIG. 1 and a size perpendicular to the paper surface adapted to the container 30. Locking hooks 41, 41 corresponding to the locking protrusions 33, 33 of the container 30 are suspended from the top surface of the cap 40, and the outer cylinder 20 is dropped between the locking hooks 41, 41. A spigot part 42 that fits the nozzle 23 is formed. A triangular reinforcing plate 41 a is attached to the base of each locking hook 41. In addition, slopes 43, 43... Inclined inward are formed on the lower end edge of the cap 40 over the entire circumference.

  The cap 40 is pressed toward the mouth 31 of the container 30 so as to cover the shoulders 32, 32 of the container 30 (in the direction of arrow A in FIG. 1), and the locking hooks 41, 41 are locked to the locking ridge 33, By elastically engaging with 33, it can be attached to the container 30 by one behavior, and the dripping nozzle 23 is sealed in a watertight manner through the spigot part 42. Further, when the cap 40 is rotated so as to be twisted to the left and right with respect to the container 30, the slopes 43, 43 in the long side direction of the lower end edge ride on the shoulders 32, 32, and are generally opposite to the arrow A in FIG. Since it is driven in the direction, it can be easily removed from the container 30 and the dropping nozzle 23 can be opened.

  The container 30 after opening has the dropping nozzle 23 faced downward and is elastically deformed by pressing with a finger, thereby discharging the chemical liquid from the dropping nozzle 23 as droplets of an appropriate size. At this time, since the chemical solution flows out to the dropping nozzle 23 while receiving a sufficiently large flow path resistance by the outlet 26 after the diameter reduction, there is no possibility that the chemical solution will be accidentally dropped or run. Further, the chemical liquid remaining in the dropping nozzle 23 after being discharged is smoothly sucked into the container 30 through the outlets 26 and 14 by returning the dropping nozzle 23 upward and restoring the elastic deformation of the container 30 by fingers. Is done.

Other embodiments

  In the fin portion 24 of the outer cylinder 20, radial slits 24 a and 24 a that are sharpened at an acute angle toward the dropping nozzle 23 may be provided axially symmetrically (FIG. 3). However, FIG. 3 (A) is a longitudinal sectional view of a main part showing a combined state of the inner cylinder 10 and the outer cylinder 20, and FIG. 3 (B) is a top view of FIG. 3 (A). The fin portion 24 can be easily reduced in diameter through the slits 24a and 24a by the tapered portion 13 of the inner cylinder 10, and the outlet 26 after the diameter reduction can be formed at the lower end (FIG. 3 (A), ( B) each two-dot chain line). However, each slit 24a preferably has a shape partially including an arc portion so that a correct circular outlet 26 can be formed at the lower end of the fin portion 24 due to the reduced diameter of the fin portion 24 (FIG. 3 ( B)). In the fin portion 24, three or more slits 24a, 24a... May be formed around the axis C at an equal angle.

  The container 30 may be a cylindrical container and may be combined with the screw-type cap 40 (FIG. 4). 4A and 4B are a diagram corresponding to FIG. 1 and a diagram corresponding to the upper half of FIG. 2, respectively.

  On the outer periphery of the mouth portion 31 of the container 30, a male screw 34 that matches the female screw 45 of the cap 40 is formed, and on the outer periphery of the cap 40, knurls 44, 44. Further, the upper end portion of the inner cylinder 10 and the upper end portion inside the outer cylinder 20 are formed so as to be in close contact with each other, and the latter fin portion 24 is reduced in diameter via the former tapered portion 13, and after the diameter reduction. Can be formed (the two-dot chain line in FIGS. 4A and 4B). However, also in FIG. 4, two or more slits 24a, 24a,...

  The regulating means formed at the contact portion between the inner cylinder 10 and the outer cylinder 20 can be the outlet 14 of the inner cylinder 10 and the outlet 26 of the outer cylinder 20 that are eccentric and partially overlap each other (FIG. 5). 5A is an enlarged view of a main part corresponding to FIG. 1, and FIG. 5B is an enlarged view of a main part on the upper surface of FIG.

  The outlet 26 of the outer cylinder 20 is opened at the center of the flat bottom of the dropping nozzle 23 with a diameter that can be stably molded on the common axis C of the inner cylinder 10 and the outer cylinder 20. On the other hand, the outlet 14 of the inner cylinder 10 has a flat upper end surface that is in close contact with the bottom surface of the bottom of the dripping nozzle 23, and the center Ca is decentered from the axis C by a distance a and is opened to a diameter that can be stably molded. Yes. Therefore, by setting the distance a so that the effective cross-sectional area of the overlapping portion of the outlets 14 and 26 corresponds to, for example, an effective diameter of about 0.2 mm or less, the flow of the flow path from the inside of the container 30 to the dropping nozzle 23 is achieved. The road resistance can be set appropriately. In addition, by arranging the outlet 26 on the axis C and decentering the outlet 14 by a distance a from the axis C, the inner cylinder 10 and the outer cylinder 20 can be arbitrarily rotated around the axis C at the time of assembly. Even so, the effective cross-sectional area and effective diameter of the overlapping portion of the outlets 14 and 26 can be made constant.

  The restricting means formed at the contact portion between the inner cylinder 10 and the outer cylinder 20 may be the shallow groove 16 formed on the upper end surface of the inner cylinder 10 and communicating the outlets 14 and 26 of the inner cylinder 10 and the outer cylinder 20. Good (FIG. 6). 6A is an enlarged view of a main part corresponding to FIG. 1, and FIG. 6B is an enlarged top view of the inner cylinder 10.

  The outlet 26 at the bottom of the dripping nozzle 23 of the outer cylinder 20 is formed on a common axis C of the inner cylinder 10 and the outer cylinder 20, and the outlet 14 at the upper end surface of the inner cylinder 10 is the outlet 26. So as not to overlap with the outlet 26, it is formed to be eccentric from the outlet 26 by a distance b. The outlets 14 and 26 have diameters that can be stably molded, and communicate with each other via a shallow groove 16 on the upper end surface of the inner cylinder 10. That is, one end of the shallow groove 16 is terminated by the outflow port 14, and the other end includes the axis C and the outflow port 26. By setting the width, depth, and distance b of the shallow groove 16, it is possible to appropriately set the flow path resistance of the flow path from the inside of the container 30 to the dropping nozzle 23.

  In FIG. 6, the outlet 14 of the inner cylinder 10 is opened on the peripheral side surface above the engaging protrusion 11 of the inner cylinder 10, and the outlet 26 on the axis C of the outer cylinder 20 is connected to the outer cylinder 20 via the shallow groove 16. You may make it communicate (FIG. 7). 7A and 7B are diagrams corresponding to FIGS. 6A and 6B, respectively. The shallow groove 16 is long, and a sufficiently large flow path resistance can be easily realized.

  6 and 7, two sets of shallow grooves 16 and outlets 14 may be formed axially symmetrically, or three or more sets may be formed at equal angles around the axis C.

  The restricting means formed at the contact portion between the inner cylinder 10 and the outer cylinder 20 is a shallow circular recess 28 formed concentrically with the outlet 26 on the axis C with respect to the bottom surface of the bottom of the dropping nozzle 23 of the outer cylinder 20. Can be formed (FIG. 8). The recess 28 communicates with the outlet 26 at the upper end surface of the inner cylinder 10 formed eccentrically from the axis C, and drops from the inside of the container 30 depending on the eccentric distance of the outlet 14 and the depth of the recess 28. The flow path resistance of the flow path leading to the nozzle 23 can be set appropriately. However, the outlet 14 is sufficiently decentered from the axis C so as not to overlap the outlet 26, and the recess 28 includes the outlet 14.

  5 to 8, the outlet 26 of the outer cylinder 20 may be a tapered hole that expands upward on the axis C (FIG. 9A), and the outlet 14 of the inner cylinder 10 is A tapered hole that expands from the inner side to the outer side of the inner cylinder 10 may be used ((B) in the figure). However, FIG. 9B representatively shows the outlet 14 corresponding to FIG. Moreover, in FIGS. 5-9, what is necessary is just to open the outflow ports 14 and 26 in the diameter which can be shape | molded stably, respectively, and both may be arrange | equalized with the same diameter and it is good also as a mutually different diameter.

Overall assembly vertical section Exploded view of main part Main part structure explanatory drawing which shows other embodiment. Structure explanatory drawing which shows other embodiment (1) Structure explanatory drawing which shows other embodiment (2) Structure explanatory drawing which shows other embodiment (3) Structure explanatory drawing which shows other embodiment (4) Configuration diagram showing another embodiment Main part expansion explanatory drawing which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Inner cylinder 12 ... Gutter 13 ... Tapered part 14 ... Outlet 16 ... Shallow groove 20 ... Outer cylinder 23 ... Drip nozzle 26 ... Outlet 28 ... Concave 30 ... Container 31 ... Mouth

Patent applicant Shingo Chemical Co., Ltd.
Attorney Tadaaki Matsuda, Attorney

Claims (5)

  An outer cylinder made of a soft synthetic resin that has an inner cylinder made of hard synthetic resin with a hook part that fits into the mouth of the container and an upward dripping nozzle, and is combined with the inner cylinder so as to cover the upper part of the hook part. And a contact portion between the inner tube and the outer tube is formed with a restricting means for restricting a flow path resistance of a flow path from the inside of the container to the dropping nozzle. Inner plug.   2. The inside stopper of the chemical solution container according to claim 1, wherein the restricting means is an outlet of the outer cylinder that is reduced in diameter through a tapered portion at an upper end of the inner cylinder.   The inner plug of the chemical solution container according to claim 1, wherein the restricting means is an outlet of the inner cylinder and the outer cylinder that are eccentric and partially overlap each other.   2. The inside stopper of the chemical solution container according to claim 1, wherein the restricting means is a shallow groove formed in the inner cylinder and communicating with an outlet of the inner cylinder and the outer cylinder.   2. The inner stopper of the chemical solution container according to claim 1, wherein the restricting means is a shallow recess formed in the outer cylinder and communicating the outlet of the inner cylinder and the outer cylinder.

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