JP4913499B2 - Inner stopper of chemical container - Google Patents

Description

  The present invention relates to an internal stopper for a chemical solution container suitable for use in which a predetermined amount of a 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. In view of this, it has been proposed to dispose a throttling device having an effective cross-sectional area smaller than the inlet cross-sectional area of the base of the dropping nozzle at the lower part of the dropping 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 into a stream, generation of extremely sized droplets, and continuous generation of a large number of droplets. The phenomenon in which a large number of droplets are inadvertently continuously generated is known as so-called “liquid running”.
Special table 2004-529827 gazette

  When using such a conventional technique, bubbles may be included in the droplets dropped from the dropping nozzle, resulting in variations in the size of the droplets, or inadvertent splashing of the droplets and splashing around. There was a problem that there was. This phenomenon is called “bubble chewing” or the like, and is a more prominent and common problem when an intermediate chamber or a partition wall with a small cross-sectional area is not provided.

  Therefore, in view of the problems of the prior art, an object of the present invention is to appropriately combine a vertically long chamber communicating with the nozzle hole and a constricted portion that restricts the flow rate of the chemical liquid, thereby causing bubbles to drop from the nozzle hole. It is an object of the present invention to provide an internal stopper of a chemical solution container that can effectively eliminate the problem of foam biting caused by the inclusion of the slag.

  In order to achieve such an object, the configuration of the present invention includes a skirt portion attached to the mouth portion of the container, a nozzle portion protruding above the skirt portion, and a vertically long chamber communicating with the nozzle hole at the tip of the nozzle portion. In the chemical liquid flow path from the inside of the container to the chamber, a small straight hole is provided as a constricted portion for restricting the flow rate, and the minimum diameter da of the nozzle hole, the inner diameter D of the chamber, the length L, the inner diameter d of the small hole is 0.3 ≦ d ≦ 0.5 mm, D ≧ 5d, L ≧ 8 mm, da <D, and the constricted portion is a chemical solution in the chamber when the chemical solution is dropped from the nozzle hole. The gist of the present invention is to make the flow rate of the gas lower than the rising speed of the bubbles in the chemical solution and to separate the chemical solution in the chamber.

  The small hole can be provided in the partition wall at the lower end of the chamber, and can be provided in the plug body provided in the skirt portion.

  According to the configuration of the invention, the constriction is provided in the flow path of the chemical solution from the inside of the container to the chamber, and by restricting the flow rate of the chemical solution, the flow rate of the chemical solution in the chamber is increased. It can be made smaller than the speed. Therefore, since the chemical liquid is effectively separated from the air in the chamber, the liquid droplets dropped from the nozzle holes communicating with the chamber do not contain bubbles, and there are no problems such as bubble chewing or liquid running. . In order to make the flow rate of the chemical solution in the chamber smaller than the rising speed of the bubbles, the maximum flow rate Q of the chemical solution in the constriction, the cross-sectional area S of the chamber, and the rising speed V of the bubbles in the chemical solution are expressed as V> Q / S may be used. For example, when the small hole provided in the partition wall at the lower end of the chamber is a constricted portion, the inner diameter of the small hole is 0.3 ≦ d ≦ 0.5 mm, the inner diameter of the chamber is D ≧ 5 d, and the length of the chamber is about L ≧ 8 mm. It is preferable to do. Further, the minimum diameter da of the nozzle hole is d <da <D, and the internal shape including the maximum diameter of the nozzle hole is appropriately determined based on the properties of the chemical liquid, the required size of the droplets, and the like.

  You may provide a constriction part in the plug body internally attached to a skirt part. That is, a small hole can be formed in the partition wall that partitions the middle, lower end, or upper end of the cylindrical plug body to form a narrowed portion.

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

  The inner stopper 10 of the chemical solution container includes a skirt portion 11 attached to the mouth portion C1 of the container C and a nozzle portion 12 protruding above the skirt portion 11 (FIGS. 1 and 2).

  The container C is a flexible plastic container, and the inner chemical solution can be discharged by elastically deforming the body by pressing the torso with fingers. The specific shape of the container C is an arbitrary shape including a simple cylindrical shape or the like, for example, a flat shape whose dimension perpendicular to the paper surface is larger than a dimension parallel to the paper surface of FIG.

  The inner plug 10 is configured by integrally forming a nozzle portion 12 and a skirt portion 11 above and below an intermediate flange portion 13. The skirt portion 11 is adapted to the mouth portion C1 of the container C, and the inner plug 10 press-fits the skirt portion 11 into the mouth portion C1 so that the lower surface of the flange portion 13 is brought into contact with the upper end of the mouth portion C1. Therefore, it is attached to the mouth C1. In addition, an engagement ridge 11a corresponding to the engagement groove C1a on the inner periphery of the mouth C1 is formed on the outer periphery of the skirt portion 11. Therefore, the inner plug 10 is engaged with the engagement ridge 11a. It is prevented from coming off by engaging with the mating groove C1a.

  The top surface of the skirt portion 11 is a partition wall 14 having substantially the same height as the flange portion 13. A small hole 14 a having an inner diameter d is formed at the center of the partition wall 14, that is, on the axis A of the inner plug 10. A filter 15 is housed in the upper part of the skirt portion 11, and the filter 15 is prevented from coming off via an engagement protrusion 11 b on the inner periphery of the skirt portion 11. By forming channel-shaped grooves 14b, 14b... Around the small hole 14a in the shape of a cross, for example, on the lower surface of the partition wall 14 with which the upper surface of the filter 15 abuts, the effective area of the filter 15 is increased and deformed. Can be prevented. However, each groove 14b opens to a counterbore 14c having a large diameter concentric with the small hole 14a. The filter 15 may be omitted, and at that time, the counterbore 14c, the grooves 14b, 14b,... May be omitted.

  A nozzle hole 12 a that expands upward is formed on the axis A at the tip of the nozzle portion 12. A parallel portion 12b that defines the minimum diameter da of the nozzle hole 12a is formed on the base side of the nozzle hole 12a.

  A vertically long chamber 12 c having a length L and an inner diameter D is formed on the axis A in the nozzle portion 12. Small hole 14a has an inner diameter d = 0.3 to 0.5 mm, chamber 12c has an inner diameter D ≧ 5d, nozzle hole 12a has a minimum diameter da = d to D, and chamber 12c has a length L ≧ 8 mm. ing. The chamber 12c communicates with the nozzle hole 12a through the parallel portion 12b, and the lower end of the chamber 12c is partitioned through a partition wall 14 having a small hole 14a.

  A screw-type cap 30 is attached to the mouth C1 of the container C. The cap 30 can seal the nozzle hole 12a of the nozzle portion 12 through the sealing portion 31 on the top surface. In addition, knurls 32, 32... Are formed on the outer surface of the cap 30, and the cap 30 can be attached to and detached from the mouth C1 via a female screw 33 on the lower inner surface and a male screw C2 on the outer surface of the mouth C1.

  When the cap 30 is removed and the whole is inverted (FIG. 3) and the container C is pressed and elastically deformed, the internal pressure of the container C increases, and the chemical in the container C is discharged from the nozzle hole 12a at the tip of the nozzle portion 12. It can be dropped as a drop LD. That is, the chemical liquid in the container C flows into the chamber 12c through the small hole 14a, temporarily stays in the chamber 12c, flows out into the nozzle hole 12a through the parallel portion 12b, and grows as a droplet LD. It separates from the nozzle hole 12a and falls freely.

Therefore, the inner plug 10 is formed with a chemical solution flow path from the inside of the container C to the chamber 12c, the parallel part 12b of the nozzle part 12, and the nozzle hole 12a through the small hole 14a. Further, the small hole 14a is a constricted portion that limits the flow rate of the chemical solution in such a chemical solution flow path. Thus, the maximum flow rate Q of the chemical solution in the small hole 14a, the cross-sectional area of the chamber 12c S = πD ^2/4, as the flying speed V of the bubbles in the drug solution in the chamber 12c, by setting the V> Q / S, the chamber The flow rate of the chemical solution in 12c can be made smaller than the rising velocity V of the bubbles, and bubbles are not included in the chemical solution flowing out from the chamber 12c to the nozzle hole 12a, thereby effectively preventing the problem of bubble biting. Can do. At this time, since the maximum flow rate Q is restricted by the small holes 14a, there is no problem such as liquid running.

Other embodiments

  A plug body 20 having a small hole 22a can be provided in the skirt portion 11 of the inner plug 10 (FIGS. 4 and 5). However, FIGS. 4A and 4B are a schematic assembly view of a main part corresponding to FIG. 1 and an overall perspective view of the plug body 20, respectively.

  The plug body 20 is provided with a partition wall 22 at an intermediate portion of the cylindrical body 21, and a small hole 22 a is formed at the center of the partition wall 22. Smooth arc-shaped cutouts 21 a and 21 a are formed on both ends of the outer periphery of the cylindrical body 21, and the outer diameter of the cylindrical body 21 matches the inner diameter of the skirt portion 11. The plug body 20 is press-fitted into the skirt portion 11 and is prevented from coming off by exceeding the engaging protrusion 11 b on the inner periphery of the skirt portion 11. Therefore, the small hole 22a of the stopper 20 forms a constricted portion that restricts the flow rate of the chemical liquid in the flow path of the chemical liquid from the inside of the container C to the chamber 12c of the inner plug 10.

  The plug body 20 can be formed in a bottomed cylindrical shape as a whole by forming a partition wall 22 provided with a small hole 22a at the lower end of the cylindrical body 21 (FIG. 6). However, FIGS. 6A and 6B are a schematic assembly view of a main part corresponding to FIG. 1 and an overall perspective view of the plug body 20, respectively.

  A straight sloped notch 21 a is formed on the entire upper end of the outer periphery of the plug body 20, and the auxiliary skirt 12 d is provided on the top of the skirt portion 11 so as to extend the chamber 12 c downward. It is suspended from the surface. The outer periphery of the lower portion of the auxiliary skirt 12d is tapered, and the plug body 20 is housed in the skirt portion 11 so as to be fitted to the auxiliary skirt 12d from the outside. The small hole 22a at the bottom of the plug body 20 forms a constricted portion of the flow path of the chemical solution, and the plug body 20 together with the auxiliary skirt 12d improves usability as the apparent length L1 <L of the nozzle section 12. be able to.

  In the above description, the plug body 20 is formed vertically symmetrical as shown in FIGS. 4 and 5, so that it is not necessary to select the vertical direction when assembling the skirt portion 11 of the inner plug 10 and the assembly process is simplified. can do. Further, the inner plug 10 and the plug body 20 can be integrally formed, for example, with a high-density polyethylene resin or a low-density polyethylene resin, and the cap 30 can be integrally formed with, for example, a polypropylene resin.

Overall schematic longitudinal section Half-section assembly drawing showing usage Model operation explanatory diagram Structure explanatory drawing which shows other embodiment (1) FIG. 2 equivalent view showing the use state of FIG. Structure explanatory drawing which shows other embodiment (2)

Explanation of symbols

C ... Container C1 ... Mouth part 10 ... Inside plug 11 ... Skirt part 12 ... Nozzle part 12a ... Nozzle hole 12c ... Chamber 14 ... Partition wall 14a ... Small hole 20 ... Plug body 22a ... Small hole

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

Claims (3)

A skirt portion to be attached to the mouth portion of the container, a nozzle portion protruding above the skirt portion, and a vertically long chamber communicating with the nozzle hole at the tip of the nozzle portion are integrally formed, A small passage of a straight hole as a constricted portion for restricting the flow rate is provided in the flow path of the chemical solution reaching the chamber, and the minimum diameter da of the nozzle hole, the inner diameter D, the length L of the chamber, and the inner diameter d of the small hole. As follows , 0.3 ≦ d ≦ 0.5 mm, D ≧ 5d, L ≧ 8 mm, da <D, and the constriction portion controls the flow rate of the chemical solution in the chamber when the chemical solution is dropped from the nozzle hole. An internal stopper for a chemical solution container, wherein the chemical solution is separated from the rising speed of bubbles in the chemical solution and the chemical solution is separated into water in the chamber. The small holes, the inside plug of the drug solution container according to claim 1, wherein the kick set the partition walls of the lower end of the chamber. The small holes, the inside plug of the drug solution container according to claim 1, wherein the kick setting the plug to interior to the skirt portion.

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