JPH068257U - Container lid sealing structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a sealing structure capable of reliably sealing a container opening to which a lid fits even under a condition where a negative pressure is generated in the container. [Structure] The lid sealing structure has an annular end surface 16 of an opening 16.
An annular sealing member 22 disposed in contact with a and a holding member 21 having a cylindrical bottomed main body portion 21a for holding the sealing member 22 are provided. From the holding member, a convex portion 24 extends axially outwardly longer than the axial length of the bottomed main body portion, and the inner surface of the lid body abuts on the convex portion to bring the sealing member into the end surface of the opening portion. Is pressed against. When the inner surface of the lid comes into contact with the convex portion, the force applied to the convex portion is dispersed and transmitted to the sealing member via the flange portion 21b of the holding member to perform sealing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a container lid, and more particularly to a sealing structure thereof. In this proposal, the ice making water is stored in advance in the water supply tank built in or attached to the ice making machine, the water is sent to the ice making plate through the ice making water tank, and the drainage is made to the drainage tank. Although specifically described below in connection with the so-called water storage type ice making machine for storage, it is clear that the application is not limited to such a field of use.

[0002]

[Prior art]

 In general, when storing contents such as liquids, gases, and powders in a container, the fact that the contents come into contact with the outside air may cause oxidation or deterioration depending on the type of the contents. Therefore, various measures have been taken to seal the lid, because it is necessary to prevent the contents from vaporizing and leaking from the lid.

In the field of the above-mentioned water storage type ice maker, a plastic container such as polyethylene manufactured by blow molding, that is, blow molding is generally used as a water supply tank and a drain tank, and various shapes and structures are available. Are known. The inventor of the present invention, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-18246, had to manufacture an expensive blow molding die for each of the water supply tank and the drain tank in the conventional one. In view of the fact that the product cost has risen considerably, a method of manufacturing a tank that can be used as a water supply tank and a tank that can be used as a drainage tank from one type of blow molded product was provided. .

FIG. 6 shows an outline of a water supply tank manufactured by the above-described method. The water supply tank 10 includes a bottom portion 11, a top portion 12, and four (2) extending between the bottom portion and the top portion. The main tank portion 15 is defined by the side portions 13 and 14 (only one of which is shown), and the upper portion of the one side portion 14 has a male screw that can be closed by a female threaded lid body 19. The attached opening 16 is formed, and the sub-tank portion 18 having the upward opening 20 is formed in the lower portion of the opening 16 through the entangled portion 17 that defines the small diameter passage 23. Although not shown in the drawings, the water supply tank 10 is described in detail in the above-mentioned Japanese Patent Laid-Open Publication No. Sho. The water supply hose, the return hose, the water level sensor, the pump, etc. can be mounted in the opening 20. The opening 16 is normally sealed by a lid body 19 and is opened when the lid body 19 is removed when replenishing the water supply tank with water.

When the water supply tank 10 is in use, ice water is stored in the water supply tank 10. However, since the main tank portion 15 is sealed by the lid 19, the space above the main tank portion 15 is under negative pressure. Since the internal ice making water is lifted, the internal water can be retained without the need for a valve, so a water storage tank for a water storage type ice making device that has a simple structure and can be easily cleaned is provided. To be done.

[0006]

[Problems to be solved by the device]

 However, since the lid 19 is screwed into the opening 16 and the opening 16 is simply sealed by this screwing, outside air does not flow in through the lid 19 and a negative pressure is not generated. There are things. If the negative pressure is not generated, the ice making water in the main tank portion 15 cannot be lifted up, so that the ice making water overflows from the opening 20 formed in the sub tank portion 18 and does not serve as a water supply tank. Further, if the above-mentioned lid is applied to a general container, it may result in the oxidation, alteration, etc. of the contents described at the beginning of this specification. Therefore, it is an object of the present invention to provide a sealing structure capable of reliably sealing the container opening to which the lid fits even under a condition where a negative pressure is generated in the container.

[0007]

In order to achieve the above-mentioned object, according to the present invention as set forth in claim 1, a container having a cylindrical opening and a lid that fits into the opening from the outside. The lid sealing structure is an annular sealing member disposed in contact with the annular end surface of the opening, a cylindrical bottomed main body for holding the sealing member, and the bottomed main body. A holding member having an annular flange portion extending from the peripheral edge of the opening, and the inner surface of the lid body abuts the outer surface of the annular flange portion to press the sealing member against the end surface of the opening portion. . According to the present invention as set forth in claim 2, the lid sealing structure has an annular sealing member arranged in contact with the annular end surface of the opening, and a cylindrical holding member for holding the sealing member. A holding member having a bottom main body portion, from which a convex portion extends axially outward longer than the axial length of the bottomed main body portion, and the inner surface of the lid body has the convex portion. The sealing member is pressed against the end face of the opening. Further, according to the present invention as set forth in claim 3, the lid sealing structure includes an annular sealing member disposed in contact with the annular end surface of the relatively thin opening, and the sealing member. In order to hold it, it is provided with a cylindrical bottomed main body portion and a holding member having an annular flange portion extending from the peripheral edge of the bottomed main body portion, and an annular groove is formed on the outer peripheral surface of the bottomed main body portion, The sealing member is partially received in the annular groove, and the inner surface of the lid body abuts the outer surface of the annular flange portion to press the sealing member against the end surface of the opening.

[0008]

[Action]

 In the lid sealing structure (FIG. 2) of claim 1, when the lid is fitted into the opening and tightened, the inner surface of the lid comes into contact with the flange of the holding member and pushes the flange, resulting in sealing. The stop member is pressed against the end surface of the opening to perform sealing. In the lid sealing structure (FIGS. 3 and 5) of claim 2, when the lid is fitted into the opening and tightened, the inner surface of the lid comes into contact with the convex portion protruding from the main body of the holding member. , The force applied to the convex portion is dispersed and transmitted to the sealing member via the flange portion of the holding member or to the sealing member held by the holding member, so that the sealing member is opened. It is pressed against the end face of and sealed. In the lid sealing structure (FIG. 4) of the third aspect, the sealing member is fitted in the annular groove and does not rotate, so that it does not wear.

[0009]

【Example】

 Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or corresponding parts. FIG. 1 is a view showing a water supply tank incorporating a first embodiment of a sealing structure according to the present invention. The water supply tank 10 itself may be the same as a conventional one, and a bottom portion 11, a top portion 12 and a side portion 13 are provided. , And a large-volume box-shaped main tank portion 15 having a box shape, and a small-volume sub-tank portion 18 also having a box shape. There is a entangled portion 17 between the two tank portions 15 and 18, and these tank portions 15 and 18 communicate with each other through a small diameter passage 23 defined by the entangled portion 17.

In the main tank portion 15, handles are formed on the top portion 12 and the side portion 14 on the side of the sub tank portion 18, respectively, but illustration thereof is omitted. An opening 16 is formed in an upper portion of the side portion 14, and the opening 16 is usually closed by a lid 19 in a sealed state. On the other hand, the top of the sub-tank portion 18 is a large rectangular opening 20. The opening 20 has a water supply pump including a pump motor mounted on a mounting plate, a return hose, a float switch, and a water supply hose. The assembly is fitted (see the above-mentioned JP-A-4-18246). FIG. 2 is an enlarged view showing a region A surrounded by a circular chain line in FIG. 1. In order to seal the opening 16 of the water supply tank 10 with the cover 19, a cover 19 and an opening 16 are formed. An appropriate packing member such as an O-ring 22 which is a sealing member is arranged between the end face 16a and a dish-shaped holding member 21, and the O-ring 22 is screwed when the lid 19 is screwed. It is intended to compress the ring 22 to ensure a tight seal.

The holding member 21 includes a bottomed main body portion 21a having a substantially cylindrical shape, and a flange portion 21b extending radially outward from the peripheral edge of the main body portion. The outer surface (on the lid side) of the flange portion 21b is formed so as to have a small coefficient of friction with the lid body and to be smooth so that the holding member 21 does not rotate when the lid body 19 is screwed. If the holding member 21 does not rotate together, the O-ring 22 does not rotate together and does not wear, so the reliability of the O-ring 22 increases. If the O-ring 22 does not rotate together, the force of the component in the circumferential direction is not substantially received, so a phenomenon such as waviness of the O-ring 22 in the circumferential direction does not occur, and a reliable sealing is achieved. Can be expected to stop.

In this embodiment, since the water supply tank 10 is a blow molding tank made of plastic such as polyethylene as described above, that is, the dimensions of each part of the tank opening 16 in terms of processing, molding method and material. Is not always good, the end surface 16a of the end surface 16a is not vertical with respect to the axial center and is inclined, and the backlash between the end surface 16a and the holding member 21 becomes large. The O-ring 22 is not uniformly compressed by the holding member 21, and a gap is generated somewhere in the annular O-ring 22 to allow air to flow in, and as a result, negative pressure is not generated in the main tank portion 15. It is assumed that

Therefore, in the second embodiment, as shown in FIG. 3 corresponding to FIG. 2, a convex portion 24 is formed outward at the center of the holding member 21. The axial length of the cylindrical convex portion 24 is set so that the inner surface of the lid body 19 contacts the convex portion 24 first when the lid body 19 is screwed into the opening 16. Greater than depth. In this embodiment, only one cylindrical convex portion 24 is formed in the center of the holding member, but the convex portion 24 may have any shape and number as long as its end face 24a is smooth. In the second embodiment, when the lid 19 is screwed into the opening 16 and tightened, the lid 19 first hits the convex portion 24, and the sealing force of the lid 19 is applied to the flange via the convex portion 24. The parts 21b act in a substantially evenly distributed manner. As a result, the O-ring 22 is also appropriately compressed and the opening 16 is reliably sealed.

Further, when the wall thickness of the opening 16 is thin, the end surface of the opening 16 also has a small area, and the cross-sectional diameter of the O-ring 22 pressed against the area is inevitably small. In that case, in order to facilitate the holding of the O-ring, as shown partially in FIG. 4, an annular groove 21d is formed in the cylindrical outer surface 21c of the main body portion 21a of the holding member 21, and the O-ring 22 is formed therein. It is preferable that the O-ring is fixed by fitting in. Further, when the lid 19 is removed, the O-ring is fitted in the annular groove 21d, so that the O-ring is unlikely to come off.

Further, although the O-ring 22 is used as the sealing member in the first and second embodiments, if the holding member 21 itself has a function as the sealing member, as shown in FIG. The O-ring and the holding member may be integrated. That is, in FIG. 5, the holding member 30 is composed of a main body portion 30a having a convex portion 31 and a flange portion 30b, as in the second embodiment, but in this embodiment, the flange portion 30b is slightly thicker. It is thick and is made of a suitable packing material that is relatively soft, elastic, and flexible, and functions as a sealing member.

When the lid body 19 is fitted into the opening 16 and tightened, the lid body 19 contacts the convex portion 31 first. The sealing force provided by the lid body 19 is uniformly dispersed by the holding member 30 and transmitted to the flange portion 30b, so that the opening portion 16 can be reliably sealed. Of course, the flange portion 21b of the holding member 21 of the first embodiment may be configured as described above and the O-ring may be omitted.

[0017]

[Effect of device]

 As described above, according to the lid sealing structure of the present invention, the sealing member is arranged so as to abut the end face of the opening, and the sealing member is directly or indirectly pressed by the lid. Even if the container is securely sealed and a negative pressure is generated in the container, it is possible to securely seal the container opening portion into which the lid is fitted. Also, in the case where the holding member is provided with a convex portion, the lid abuts on this convex portion, and the sealing force is dispersed and uniformly transmitted to the flange portion of the holding member or the sealing member. Even if the opening is inclined, the sealing can be further ensured. Further, in the case where the holding member is formed with the annular groove and the sealing member is fitted therein, since the sealing member does not rotate, wear of the sealing member can be prevented. It is possible to contribute to extending the life of the device and improving the reliability of the device.

[Brief description of drawings]

1 is a schematic cross-sectional view of a water supply tank incorporating a first embodiment of a lid sealing structure according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a region A surrounded by a chain line in FIG.

FIG. 3 is a sectional view corresponding to FIG. 2, showing a second embodiment of the lid sealing structure according to the present invention.

FIG. 4 is a partial cross-sectional view showing a modified embodiment of the second embodiment shown in FIG.

5 is a cross-sectional view showing another modified example of the second embodiment shown in FIG.

FIG. 6 is a sectional view showing a typical example of a container in which the present invention is implemented.

[Explanation of symbols]

10 ... Water supply tank (container), 16 ... Opening part, 1
6a ... annular end face of opening, 19 ... lid, 21 ...
..Holding members, 21a ... Bottomed main body portion, 21b ...
Flange portion, 21c ... Outer peripheral surface of bottomed main body portion, 21d
... annular groove, 22 ... O-ring (sealing member), 2
4 ... convex part, 30 ... holding member, 30a ... bottomed main body part, 30b ... flange part (sealing member), 31 ...
..Convex parts

Claims (3)

[Scope of utility model registration request] 1. A container lid sealing structure having a cylindrical opening and a lid fitted into the opening from the outside,
An annular sealing member arranged in contact with the annular end surface of the opening, a cylindrical bottomed main body for holding the sealing member, and an annular flange extending from the peripheral edge of the bottomed main body. A container lid sealing structure, comprising: a holding member having a portion, wherein an inner surface of the lid is in contact with an outer surface of the annular flange portion to press the sealing member against an end surface of the opening. 2. A container lid sealing structure having a cylindrical opening and a lid fitted into the opening from the outside,
An annular sealing member disposed in contact with the annular end surface of the opening, and a holding member having a cylindrical bottomed main body portion that holds the sealing member, and the holding member includes the The convex portion extends axially outwardly longer than the axial length of the bottom body portion, and the inner surface of the lid body abuts the convex portion to press the sealing member against the end surface of the opening. , Container lid sealing structure. 3. A lid sealing structure for a container, which has a cylindrical relatively thin opening, and a lid fitted into the opening from the outside, and is in contact with an annular end surface of the opening. And a holding member having a cylindrical bottomed main body and an annular flange extending from the peripheral edge of the bottomed main body to hold the sealing member. , An annular groove is formed on the outer peripheral surface of the bottomed main body portion, the sealing member is partially received in the annular groove, and the inner surface of the lid body abuts the outer surface of the annular flange portion. A lid sealing structure for a container, wherein the sealing member is brought into pressure contact with the end face of the opening.