JPH0734259U - Sealing structure for screwing part - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sealing structure of a screwing portion that can stabilize the screwing of the screwing portion while obtaining a reliable sealing effect. [Structure] Annular grooves 15 and 16 surrounding a screw 12 for fitting the porous seal member 14 are formed on the screw fastening joint surfaces 11b and 13a, and the porous seal member 14 is fitted and adhered to the annular grooves 15 and 16. A sealing structure for a screwed portion, wherein the agent is filled in the porous seal member 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing structure for a screwing portion, and more particularly to a sealing structure for a screwing portion such as a speaker box having a duct that needs to prevent sound leakage to the outside.

[0002]

[Prior art]

 Conventionally, in the sealing structure of the screwed portion, a packing is attached to the joint surface of the screwed portion, and the structure is such that, for example, sound is prevented from leaking to the outside. However, since the packing cannot reliably seal, as shown in FIG. 2, a sealing structure of a screwed portion using an adhesive instead of the packing has been devised.

Reference numeral 21 in the drawing denotes an upper screw fastening portion, and a recess 21a for accommodating a screw head 22a is formed at a predetermined position of the upper screw fastening portion 21, and a screw portion 22b is formed substantially at the center of the recess 21a. A female screw 21c that is screwed with is formed up to the joint surface 21b with the lower screw stop portion 23. From the joint surface 23a of the lower screw-fastening portion 23 with the upper screw-fastening portion 21, a predetermined length of a female screw 23b is formed at a position facing the female screw 21c. In the sealing structure of the screwed portion configured as described above, the joint surface 21b is superposed by the screwing of the screw 22 on the joint surface 23a coated with a predetermined amount of the adhesive 24, and the upper screwed portion 21 and the lower screw The stopper 23 is fixed. The adhesive 24 is hardened to be hermetically sealed.

In a radio-cassette or the like, the upper screw-fastening portion 21 and the lower screw-fastening portion 23 are often molded using ABS resin or the like, and the adhesive 24 is made of styrene monomer or MEK (methyl ethyl ketone). The same ABS resin as the adherend is dissolved in a solvent.

[0005]

[Problems to be solved by the device]

 In the above-described sealing structure of the screwed portion, the adhesive 24 may protrude from the internal thread 21c to the recess 21a during screwing, and the protrusion of the adhesive 24 occurs between the joint surface 21b and the joint surface 23a. This shows that the adhesive 24 is excessively applied to the gap. Thus, if the adhesive 24 is excessively supplied with respect to the size of the gap between the joint surface 21b and the joint surface 23a, the adhesive 24 will protrude into the recess 21a and be cured, which is a design problem. Become. To solve this problem, reduce the amount of adhesive 24 applied to the joint surface 23a, or apply partial coating only to the joint surface 23a apart from the female screw 23b, instead of applying it entirely to the joint surface 23a. It corresponds by. However, if the application amount of the adhesive 24 is reduced or the adhesive area between the adhesive 24 and the surface to be adhered is reduced, the adhesive force will be reduced, and strong adhesion cannot be achieved, and a reliable sealing effect can be obtained. There was a problem such as not being able to obtain.

In order to obtain a reliable sealing effect, as described above, as the adhesive 24, the reactive adhesive 24 is used, which first melts the bonding surfaces 21b and 23a by a chemical reaction and then hardens and bonds them. When the adhesive 24 is extruded up to the female screws 21c and 23b due to excessive application of the reactive adhesive 24, the female screws 21c and 23b are melted, and the tightening force by the screw 22 is reduced. There was also a problem that it might not be possible.

The present invention has been made in view of the above problems, and it is possible to obtain a reliable sealing effect, and at the same time, to secure the screwing of the screwing portion, the screwing portion can be secured. The purpose of the invention is to provide a seal structure.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the sealing structure of the screwed portion according to the present invention is such that an annular groove surrounding a screw for fitting a porous seal member is formed on a screwing joint surface, and the porous seal member is formed in the annular groove. And the adhesive is filled in the porous seal member.

[0009]

[Action]

 According to the above configuration, an annular groove surrounding the screw for fitting the porous seal member is formed on the screwing joint surface, the porous seal member is fitted in the annular groove, and the adhesive is used for the porous seal. Since the member is filled, the entire surface of the screwed portion that comes into contact with the porous seal member is bonded by the adhesive filled in the porous seal member. The adhesion area in this adhesion is approximately equal to the surface area of the porous seal member, and a sufficient adhesion area between the adhesive and the adherend surface is secured, resulting in strong adhesion and reliable sealing. Will be realized. Further, since the liquid adhesive is filled in the porous seal member by utilizing the capillary phenomenon and is held to a certain extent, it will not stick out from the annular groove unless a considerable external force is applied. In addition, the screwing of the screwing part becomes stable.

[0010]

【Example】

 An embodiment of a sealing structure for a screwed portion according to the present invention will be described below with reference to the drawings. 1A and 1B are views schematically showing an embodiment of a sealing structure of a screwed portion according to the present invention, in which FIG. 1A is a sectional view and FIG. 1B is a partially exploded perspective view showing an A portion in FIG. 1A. It is a figure. Reference numeral 11 in the drawing denotes an upper screw fastening portion. A concave portion 11a for accommodating a screw head 12a is formed at a predetermined position of the upper screw fastening portion, and a screw portion 12b is screwed into a substantially central portion of the concave portion 11a. A female screw 11c is formed up to the joint surface 11b with the lower screw fastening portion 13. The upper annular groove 15 for fitting the cylindrical porous seal member 14 is formed at a position spaced apart from the internal thread 11c on the joint surface 11b, and the upper end portion of the porous seal member 14 is fitted therein. Has become. On the other hand, the lower screw fastening portion 13 has a joining surface 13a with the upper screw fastening portion 11. From this joining surface 13a, since the upper screw fastening portion 11 is formed, the female screw 13b has a predetermined length at a position facing the screw 11c. Is formed. Further, a lower annular groove 16 for fitting the porous seal member 14 is formed at a position spaced apart from the internal thread 13b on the joint surface 13a at a position facing the upper annular groove 15.

The upper screw-fastening portion 11 and the lower screw-fastening portion 13 are formed of ABS resin or the like, and the porous seal member 14 is made of sponge, cloth (nonwoven fabric), or porous rubber in a cylindrical shape. It has been processed. The porous seal member 14 is filled with an adhesive. As the filled adhesive, the same adhesive as the adherend in a solvent such as styrene monomer or MEK, in this case, ABS resin is used. There is.

When assembling the sealing structure of the screwed portion configured as described above, the porous seal member 14 in which the lower screwed portion 13 is filled with the adhesive as shown in FIG. And the lower end of the porous seal member 14 is fitted into the lower annular groove 16. Then, the upper screw fastening portion 11 is superposed from above the lower screw fastening portion 13 and the porous seal member 14, and the upper annular groove 15 is fitted to the upper end portion of the porous seal member 14. Next, the screw 12 is screwed into the female screw 11c and the female screw 13b with the joining face 11b abutting on the joining face 13a, and the upper screw fastening part 11 and the lower screw fastening part 13 are fixed. Then, the screwing portion is adhered and sealed by curing the adhesive.

As described above, in the sealing structure of the screwed portion according to the present embodiment, since the adhesive is filled in the porous seal member 14, the porous in the upper annular groove 15 and the lower annular groove 16 is porous. All the contact surfaces with the seal member 14 can be adhered by the above-mentioned adhesive agent filled in the porous seal member 14. The adhesion area in this adhesion is approximately equal to the surface area of the porous seal member 14, and the adhesion area between the adhesive and the adherend is sufficiently secured, so the adhesion becomes strong and a reliable sealing is achieved. Can be realized. Further, since the paste-like adhesive is filled in the porous seal member 14 by utilizing the capillary phenomenon and held to a certain extent, the adhesive from the upper annular groove 15 and the lower annular groove 16 is applied unless a considerable external force is applied. It does not stick out and the screwing of the screwing part can be made stable.

[0014]

[Effect of device]

 As described above in detail, in the screw fastening seal structure according to the present invention, an annular groove surrounding the screw for fitting the porous seal member is formed in the screw fastening joint surface, and the porous groove is formed in the annular groove. Since the sealing member is fitted and the adhesive is filled in the porous sealing member, the adhesive filled in the porous sealing member is all the surfaces of the screwed portion that come into contact with the porous sealing member. Can be glued by. The adhesion area in this adhesion is approximately equal to the surface area of the porous seal member, and the adhesion area between the adhesive and the adherend is sufficiently secured, resulting in strong adhesion and reliable sealing. Can be realized. Further, since the paste-like adhesive is filled in the porous seal member by utilizing the capillary phenomenon and held to a certain extent, it does not stick out from the annular groove unless a considerable external force is applied, and the screw is used. The screwing of the stopper can be made stable.

[Brief description of drawings]

1A and 1B are views schematically showing an embodiment of a sealing structure for a screwed portion according to the present invention, in which FIG. 1A is a sectional view and FIG. 1B is a partially exploded perspective view showing a portion A in FIG. 1A. It is a figure.

FIG. 2 is a plan view schematically showing a conventional seal structure of a screwed portion.

[Explanation of symbols]

 11b Joining surface 12 Screw 13a Joining surface 14 Porous seal member 15 Upper annular groove 16 Lower annular groove

Claims (1)

[Scope of utility model registration request] 1. An annular groove surrounding a screw for fitting a porous seal member is formed on a screwing joint surface, the porous seal member is fitted in the annular groove, and an adhesive is applied to the porous seal member. Sealing structure of screwed part characterized by being filled.