Check valve for liquid containers

Abstract

To provide a check valve for a liquid container having a simple structure, excellent sealing force, and high versatility.SOLUTION: There is provided a check valve to be mounted in a mouth P1 of a container P. The check valve has a bottomed cylindrical body 1 fitting in the mouth P1. An extraction port 1B is formed at a bottom 1A of the body 1. A sealing member 3 for sealing the extraction port 1B in the body 1 is disposed. An elastic support member 2 for connecting the bottom 1A of the body 1 and a bottom of the sealing member 3 is disposed. The body 1, the support member 2 and the sealing member 3 are integrally and continuously molded. The support member 2 has an elongated shape curved in a U-shape. The support member 2 is connected from an undersurface of the bottom 1A of the body 1 to the bottom side of the sealing member 3.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a check valve for liquids that is mainly attached to the mouth of a tube container and prevents outside air from entering after the contents are extruded. [Background technology]

[0002] A check valve to be attached to the mouth of a tube container has been proposed, as described in Patent Document 1. This check valve has a structure provided with a valve body 9 made of a cylindrical main body 7 to be inserted into the opening 2 of a tube container 1, legs 8 made of a spirally curved elastic material connected to the underside of the main body 7, and a flat sheet plate 6 supported by the legs 8.

[0003] Furthermore, a bottomed cylindrical inner cylinder 5 is provided as a separate component from the valve body 9 and is inserted into the opening 2 of the tube container 1, and a mouth hole 4 is formed at the bottom of this inner cylinder 5. Then, the sheet plate 6 of the valve body 9 is placed on top of the mouth hole 4 of the inner cylinder 5 to seal it.

[0004] After the contents of the tube container 1 are pushed up the seat plate 6 through the opening 4 and discharged, the seat plate 6 closes the opening 4 due to the elastic force of the legs 8 of the valve body 9 .

[0005] Furthermore, Patent Document 2 describes a check valve that uses a hemispherical valve member 11 instead of the flat seat plate 6 of Patent Document 1. This check valve 5 is configured so that the hemispherical seating surface 31 of the valve member 11 is pressed against a valve seat 10 formed in the mouth 3 of a tube container 2, thereby sealing the mouth 3. This valve member 11 is connected to the underside of a nozzle 12 via a spirally curved elastic body 13, and the nozzle 12 is attached to the mouth 3 of the tube container 2. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 62-8937 [Patent Document 2] Patent No. 4277504 Summary of the Invention [Problem to be solved by the invention]

[0007] In a configuration in which the opening 4 at the bottom of the middle tube 5 is opened and closed by a sheet plate 6, as in Patent Document 1, there is a risk that the contents or residue of the contents may remain between the periphery of the opening 4 and the sheet plate 6. Even if only a small amount of the contents remains, the sealing power of the sheet plate 6 will be impaired.

[0008] Furthermore, since the inner cylinder 5 is provided as a separate member from the valve body 9 and is assembled and attached to the opening 2, the structure of the check valve becomes complicated, which increases the manufacturing cost.

[0009] On the other hand, in a check valve 5 that opens and closes the mouth 3 of a tube container 2 with a hemispherical valve member 11 as in Patent Document 2, the diameter of the valve member 11 needs to be formed to match the diameter of the valve seat 10 formed in advance at the mouth 3 of the tube container 2.

[0010] Moreover, since this valve member 11 is configured to be attached to the mouth 3 of the tube container 2 together with the nozzle 12, the diameters of the valve member 11 and the nozzle 12 are determined by the diameter of the mouth 3 of the tube container 2 and the diameter of the valve seat 10. For this reason, the configuration of the check valve in Patent Document 2 is closely related to the configuration of the mouth 3 of the tube container 2.

[0011] Therefore, the use of the check valve 5 of Patent Document 2 is limited to a dedicated tube container 2 with which it has a close relationship, and the versatility of this check valve 5 is therefore extremely limited.

[0012] SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a check valve for a liquid container which has a simple structure, excellent sealing power, and is highly versatile. [Means for solving the problem]

[0013] In order to solve the above-mentioned problems, the first aspect of the present invention is a check valve to be fitted into the mouth P1 of a container P, which is made by integrally and continuously molding a cylindrical main body 1 with a bottom that fits into the mouth P1, a spherical sealing body 3 that seals the extraction port 1B formed in the bottom 1A of the main body 1 inside the main body 1, and an elastic support member 2 that connects the main body 1 and the sealing body 3 outside the main body 1, The sealed body 3 has a spherical portion 3A on the bottom side that is inserted into the extraction port 1B, and a locking step 3B that locks onto the top surface of the bottom 1A is provided around the outermost periphery of the spherical portion 3A. A deformed recess 3C is formed from the upper end of the sealed body 3 to the inside, and a taper 3D is formed from the outer periphery of the locking step 3B toward the upper end, so that the sealed body 3 can be inserted into the main body 1 from the extraction port 1B. .

[0014] The support member 2 of the second means has an elongated shape bent into a U-shape, is connected from the underside of the bottom 1A of the main body 1 to the bottom side of the sealed body 3, and is arranged so that it can be freely inserted into the main body 1 together with the sealed body 3. [Effects of the Invention]

[0017] As in the present invention, a check valve with a simple structure can be provided by comprising a main body 1 that fits into the mouth portion P1, a spherical sealing body 3 that seals the extraction port 1B of the main body 1, and an elastic support member 2 that connects the main body 1 and the sealing body 3 outside the main body 1.

[0018] Furthermore, the main body 1, which has the extraction port 1B formed therein, is fitted into the mouth P1 of the container P, and the extraction port 1B formed in the bottom 1A of the main body 1 is sealed inside by the sealing body 3. Therefore, to use the check valve with the container P, it is only necessary that the inner diameter of the mouth P1 matches the outer diameter of the main body 1. As a result, it can be attached to any container P with a matching diameter, making it highly versatile.

[0019] The support member 2 has an elongated, U-shaped bend and is connected from the underside of the bottom 1A of the main body 1 to the bottom side of the sealed body 3. This allows the sealed body 3 to move with the pressure of the container P, making it possible to adjust the amount of content dispensed. The elongated support member 2 has elasticity, returning the sealed body 3 to its fixed position, providing a high non-return effect regardless of the viscosity of the content. Furthermore, since the support member 2 is freely insertable into the main body 1 along with the sealed body 3, the range of movement of the sealed body 3 is increased, ensuring a wide flow path formed at the extraction port 1B.

[0020] Furthermore, the check valve sealing body 3 has an extremely high sealing performance because it has a locking step 3B around the outermost periphery of the spherical portion 3A that locks onto the top surface of the bottom portion 1A. Moreover, since the spherical portion 3A is provided on the spherical bottom side, the contents can be discharged smoothly without being blocked, and after discharge, the spherical portion 3A acts as a guide surface that always returns to its original center position.

[0021] In addition, the spherical sealing body 3 inserted into the main body 1 through the extraction port 1B has a deformed recess 3C extending from the upper end to the inside and a taper 3D extending from the outer surface of the locking step 3B toward the upper end, making it easy to insert the sealing body 3 into the main body 1 through the extraction port 1B.

[0022] Furthermore, by continuously molding the main body 1, the support member 2 and the sealing body 3 integrally, the check valve of the present invention can be manufactured rationally and offered at low cost.

[0023] As described above, the present invention provides various advantages such as a simple structure, excellent sealing power, and high versatility. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a cross-sectional view showing an embodiment of a check valve of the present invention. [Figure 2] FIG. 3 is a cross-sectional view showing a state in which the sealed body of the present invention is inserted into the main body. [Figure 3] 4 is a cross-sectional view showing the sealing state of the mouth portion by the check valve of the present invention. FIG. [Figure 4] 1 is a cross-sectional view showing a discharge state from a mouth portion of a check valve according to the present invention. [Figure 5] FIG. 2 is a cross-sectional view of the main part showing the sealing body and extraction port of the present invention. [Figure 6] FIG. 2 is a perspective view of the sealed body of the present invention as seen from the bottom side before insertion into the main body. DETAILED DESCRIPTION OF THE INVENTION

[0025] An embodiment of the present invention will be described below. The check valve of the present invention is attached to the opening P1 of a squeezable container P. The container P is, for example, a tube container filled with a relatively viscous liquid such as cosmetics or food. However, this container P can also be used for liquid containers other than tube containers, regardless of the viscosity of the liquid.

[0026] The check valve of the present invention is basically configured to include a main body 1, a support member 2, and a sealing body 3 (see Figure 1). The main body 1, support member 2, and sealing body 3 are configured to be integrally molded from thermoplastic resin.

[0027] The main body 1 is a cylindrical body with a bottom that fits into the mouth P1 of the container P, and an extraction port 1B is formed at the bottom 1A of the main body 1 (see Figure 1). When a sealing body 3 is inserted into the main body 1 through this extraction port 1B, it becomes a check valve (see Figure 2). When in use as a check valve, the main body 1 with the sealing body 3 inserted inside is fitted into the mouth P1 (see Figure 3). The main body 1 shown in the figure is in a state where the outer diameter of the open end of the main body 1 fits into the inner diameter of the open end of the mouth P1. Note that the shape and position of the fitting portion of the main body 1 are not limited to the illustrated example and can be modified as desired.

[0028] The support members 2 are elastic members that connect the main body 1 and the sealed body 3 outside the main body 1. In the illustrated example, two opposing support members 2 are shown connected to the underside of the bottom 1A of the main body 1 and the bottom side of the sealed body 3 (see Figure 1). The support members 2 have an elongated shape that is bent into a U-shape. When the sealed body 3 is inserted into the main body 1, the support members 2 rebound at the bent portion, generating an elastic biasing force that is always directed downward in the support members 2. As a result, the sealed body 3 inserted into the main body 1 seals the extraction port 1B (see Figure 2).

[0029] Furthermore, a locking projection 2A is formed on the side of the support member 2 (see FIG. 1). This locking projection 2A is a part that locks onto the underside of the bottom 1A of the main body 1 when liquid is being discharged (see FIG. 4). In other words, when the sealed body 3 moves due to the pressure of the liquid, if pressure is suddenly applied, the sealed body 3 may fly out together with the support member 2 and not return to its original position. Therefore, by locking the locking projection 2A onto the underside of the bottom 1A of the main body 1, the sealed body 3 and support member 2 are prevented from flying out. Furthermore, the illustrated support member 2 has a rectangular cross section (see FIG. 6). The cross-sectional shape, length, number, etc. of this support member 2 can be set as desired.

[0030] The sealing body 3 is a spherical member that seals the extraction port 1B of the main body 1 inside the main body 1. The bottom side of the sealing body 3 is provided with a spherical surface 3A. When the extraction port 1B opens and liquid is discharged, the liquid is discharged along this spherical surface 3A. When the extraction port 1B is closed, this spherical surface 3A acts as a guide surface and returns to its original position.

[0031] Furthermore, a locking step 3B is provided around the outermost periphery of the sealing body 3 (see Figure 5). This locking step 3B is the part that locks onto the upper surface of the bottom part 1A when the spherical part 3A of the sealing body 3 is inserted into the extraction opening 1B. By locking this locking step 3B onto the bottom part 1A, a configuration with high sealing strength is achieved.

[0032] The sealed body 3 is inserted into the main body 1 through the extraction opening 1B (see FIG. 5). To this end, a deformed recess 3C is formed from the top end of the sealed body 3 to the interior, and a taper 3D is formed from the outer surface of the locking step 3B toward the top end of the sealed body 3. The diameter of the insertion end of the sealed body 3 is smaller than the diameter of the extraction opening 1B (see FIG. 6). Therefore, when the sealed body 3 is inserted into the main body 1 from its top end along the taper 3D, the locking step 3B passes through the extraction opening 1B and locks onto the top surface of the bottom 1A inside the main body 1 (see FIG. 5).

[0033] At this time, if the main body 1, support member 2, and sealing body 3 are continuously molded integrally from a thermoplastic resin, the extraction port 1B of the main body 1 also deforms, making it easier to insert the sealing body 3. The material of this thermoplastic resin can be selected arbitrarily.

[0034] The configuration of the present invention is not limited to the illustrated example, and the configuration, position, dimensions, etc. of the main body 1, support member 2, sealed body 3, etc. can be changed as desired within the scope that does not change the gist of the present invention. [Explanation of symbols]

[0035] P container P1 mouth 1 Main unit 1A bottom 1B Extraction port 2 Support member 2A Locking protrusion 3 Closed body 3A Spherical part 3B Locking step 3C Deformed Concave 3D Taper

Claims

1. A check valve to be fitted into the mouth of a container is formed by continuously molding a cylindrical body with a bottom that fits into the mouth, a spherical sealing body that seals the extraction port formed at the bottom of the body inside the body, and an elastic support member that connects the body and the sealing body outside the body, The sealing body has a spherical portion on the bottom side that is inserted into the extraction port, and a locking step portion that locks onto the upper surface of the bottom is provided around the maximum outer periphery of the spherical portion, A check valve for a liquid container is characterized in that a deformed recess is formed from the upper end of the sealed body to the inside, and a taper is formed from the outer surface of the locking step portion toward the upper end, and the sealed body is inserted into the main body from the extraction port.

2. 2. A check valve for a liquid container as described in claim 1, wherein the support member has an elongated shape bent into a U-shape, is connected from the underside of the bottom of the main body to the bottom side of the sealed body, and is arranged so that it can be freely inserted into the main body together with the sealed body.

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