JPH0123524Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a sealing plug structure, and in particular to a type of sealing in which an opening is sealed by engaging a plug with an external thread with an internal thread inside the opening. Regarding the plug structure.

(Prior art) The above-mentioned sealing plug structure is used, for example, when sealing the opening of a container containing a fluid, in which a totuna-shaped member is placed inside the opening of the container, and a sealing material is placed outside the opening. A stopper (hereinafter referred to as a plug) is attached to the container, and the nut-shaped member and plug are tightened around the opening of the container to seal it.

In this case, in order to prevent the nut-shaped member from moving inside the container when assembling the plug, conventional methods have been to integrally mold the nut-shaped member and the container with the same material, or to make the nut-shaped member separately and to prevent the nut-shaped member from moving inside the container. If the material is metal, spot welding, brazing, etc. are used, and if the material is synthetic resin, methods such as spin welding are used to fix it inside the container. However, these methods have drawbacks such as high cost when producing in small quantities by integral molding, and reduced rigidity of the container or increased processing cost when fixed later by welding, brazing, etc.

(Purpose of the invention) The present invention was made in view of these problems of the conventional technology, and it is possible to hold the nut-shaped member to the extent that it does not interfere with the attachment and detachment of the plug without having to fix it by integral molding, welding, etc. The purpose is to provide a sealing plug structure.

(Structure of the invention) In order to achieve the above-mentioned object, the present invention includes a nut-shaped member having an internal thread disposed inside an opening of a wall member such as a container so as to align with the opening, A flange portion of the plug that is screwed into the nut-shaped member from outside the wall member through the opening, and a wall surrounding the opening, the plug having an external thread that can be screwed into the internal thread of the shaped member, and an annular sealing material. In a sealing plug structure in which an opening is sealed by sandwiching a sealing material between the wall member and the member, the wall member is formed into a cylindrical part formed around the opening so as to have the opening at the bottom, and the side part a cylindrical portion having a plurality of ribs spaced apart from each other and extending in the circumferential direction of the cylindrical portion; It is formed into a cylindrical shape that can be fitted into the rib and has an outer diameter larger than the inner diameter of this cylindrical portion of the rib, and a length of each rib is formed on the outer periphery of the cylindrical portion of the nut-shaped member at a position opposite to each rib. A notch extending in the axial direction with a corresponding width is provided, and the outer periphery on the tip side in the direction in which the nut-shaped member is inserted into the cylindrical portion is flexible, and has an edge that can be engaged with the rib after the nut-shaped member is inserted. It is characterized by a structure in which the nut-shaped member is formed in the lip part and held in the fitted position within the cylindrical part by engagement between the notch part and the rib and engagement between the edge of the lip part and the rib. .

(Description of Examples) Hereinafter, the present invention will be described in detail based on Examples with reference to the accompanying drawings.

1 to 3 show the main parts of an embodiment of the present invention, but before explaining this embodiment, a conventional sealing plug structure will be explained based on FIG. 4.

In FIG. 4, reference numeral 51 indicates a metal container for containing fluid, and the bottom of the container 51 is provided with a circular opening. A nut-shaped member 52 made of metal or synthetic resin and having an internal thread forms the container 5.
It is placed inside the bottom of 1 so as to align with the opening. The internal thread of the member 52 is formed so that its inner diameter is somewhat smaller than the diameter of the opening of the container 51, and the member 52 is fixed to the bottom of the container 51 by welding, brazing, or the like. Ru. Reference number 54
is a bolt-shaped plug with an external thread that can be screwed into the internal thread of the nut-shaped member 52, and the flange of the plug facing the bottom of the container 51 has an annular groove surrounding the external thread. is formed and accommodates an annular sealing material 53.

In this configuration, by screwing the outer threaded portion of the plug 54 with the inner thread of the nut-shaped member 52 and tightening, the sealing material 53 comes into contact with the periphery of the opening of the container 51 and is tightened, thereby sealing the opening.

On the other hand, a cylindrical portion 10 projecting downward is formed at the bottom of the container 1 in FIG. 1 by molding or the like, and an opening is provided approximately at the center of the bottom of the cylindrical portion 10. A rib 5 is recessed inward of the container around the bottom opening of the cylindrical portion to receive the annular sealing material 3, and a rib 5 is recessed inward on the side of the cylindrical portion and extends in the circumferential direction of the cylindrical portion 10. are formed. In this embodiment, the ribs 5 are provided at four diametrically opposed positions as shown in FIG. 3, but the ribs 5 are not limited thereto.

On the other hand, the nut-shaped member 2 is made of an elastic synthetic resin material such as nylon or polyacetal.
It is formed into a substantially cylindrical shape with an outer diameter that can fit into the cylindrical portion 10 of the container and which is somewhat larger than the inner diameter of the cylindrical portion of the rib 5 . The inner circumferential surface of the nut-shaped member 2 is formed with an internal thread similar to that of the conventional example described above, and its circumferential wall is connected to each rib 5 of the cylindrical portion, as clearly shown in FIGS. 2a and 2b. The opposing parts have a hollow structure. In this embodiment, other parts of the nut-shaped member have a hollow structure to reduce the weight, but this is not essential for implementing the present invention. The outer walls of these hollow parts facing the ribs 5 of the nut-shaped member 2 are the ribs 5.
The notch is formed to a height corresponding to the lower jaw of the mandible, and each constitutes a flexible lip portion 6 in the radial direction.

The plug 4 has almost the same configuration as the conventional example described above, except that the flange surface on the container side is flat because the recess for accommodating the sealing material 3 is provided on the container 1 side. .

In this embodiment, in order to assemble the nut-shaped member 2 to the container 1, the nut-shaped member 2 is first attached to the cylindrical portion inside the container.
0 position, and align the positions of the rib 5 and the lip portion 6. Subsequently, when the nut-shaped member 2 is pressed with a constant load, the nut-shaped member 2 bends its lip part 6 by the rib 5 of the cylindrical part and bends into the cylindrical part 1.
Insert into 0. At the same time that the end surface 8 of the nut-shaped member 2 abuts against the bottom of the cylindrical portion 10, each lip portion 6 climbs over the rib 5 and returns to its original shape. As a result, the lower jaw of each rib 5 and the tip of the lip portion 6 come into contact, holding the nut-shaped member 2 in a predetermined position and preventing its movement in the axial direction. Further, since each lip portion 6 of the nut-shaped member is formed to have a length corresponding to the width of the opposing rib 5, the lip portion 6 is
At the stage where the ribs 5 have crossed over, both ends of each rib 5 come into contact with the member portions 9 at both ends of each lip portion 6, thereby suppressing movement in the circumferential direction. In order to easily fit the nut-shaped member 2 into the cylindrical portion 10 of the container 1 and to make it difficult to come out from the same, it is desirable that the outer periphery of the lip portion 6 be tapered as shown by reference numeral 7 in FIG. 2b.

After the nut-shaped member 2 is housed in the predetermined position in the container 1 in this way, the sealing material 3 is placed in the recess of the cylindrical portion 10, and the plug 4 is screwed onto the nut-shaped member 2 and tightened. The sealing material 3 is tightened between the plug 4 and the plug 4 to seal the opening.

Next, an embodiment in which the present invention is applied to a fuel filter device for a vehicle will be described based on FIG.

In FIG. 5, the fuel filter device is composed of a metal topper body 101, a filter assembly 102, a level switch device 103, and a hand pump 104. The filter assembly 102 includes a metal case 102a and an axial filter element 10.
2b constitutes the main part, and a water reservoir space 105 is formed below the filter element 102b. Atsupa body 101 has a nipple 107 with a fuel inlet 106 and a bolt 108.
This pipe 106 communicates with the fuel inlet 101c of the atsupah body 101.
At the top of the Atsupa body 101, there is a hand pump 1.
Diaphragm 109 and valve body 11 that constitute 04
0, protector member 111, diaphragm chamber 11
2 etc. are arranged.

That is, the diagram 109 made of a stretchable material such as rubber is connected to the metal caps 113 and 114.
The cap 113 is clamped and fixed between the
114 is caulked and fixed to a metal mounting member 115. The outer peripheral edge of this diaphragm 109 is connected to the cover 116 by tightening and fixing the metal cover 116 to the upper end of the Atsupa body 101.
It is clamped and fixed between the upper end of 01.

The upper end of the mounting member 115 protrudes to the outside of the cover 116, and a cup-shaped operating member 118 made of resin is attached to this upper end using screws 117. The operating member 118 has a shape that partially covers the cover 116, and a coil spring 119 is interposed between the cover 116 and the laterally expanded portion so as to cover the cover 116. Due to this mounting relationship, when the operating member 118 is pushed by hand, the coil spring 119 is compressed, the mounting member 115 is lowered, and the diaphragm 109 is bent. When you release your hand from the operating member 118, the coil spring 11
9 extends and connects the mounting member 1 via the operating member 118.
15 will rise, and the diaphragm 109 will return to its original state.

In order to supply fuel to the filter assembly 102 by utilizing pressure fluctuations in the diaphragm chamber 112 due to the reciprocating operation of the operating member 118, the valve body 1
10 and protector member 111 are attached to Atsupa body 1
It is installed on 01.

A cylindrical portion 120 provided with a plurality of ribs 205 is formed at the bottom of the case 102a, as in the previous embodiment. The nut-shaped member 202 fitted into this cylindrical portion is molded into a cylindrical shape from an elastic synthetic resin material such as nylon or polyacetal so as to have the same structure as in the previous embodiment. Therefore, the nut-shaped member 202 has a corresponding lip portion 206 and a rib 205.
and are placed in position in the tubular portion 120 in a manner similar to the previous embodiment.

This embodiment differs from the previous embodiments in that the plug 204 constitutes the mounting base of the level switch device 103. Level switch device 103
is equipped with a reed switch 103c using a float 103b with a known magnet 103a. Plug 2 which is the base of this level switch device 103
04 is screwed into the inner thread of the nut-shaped member 202, and the space between the bottom of the case 102a and the plug 204 is sealed by an O-ring 203.

Furthermore, a drain plug 145 for draining water is attached to the base of the level switch device 103. Note that when this drain plug 145 is loosened a little, a horizontal groove (not shown) communicating within the case 102a communicates with the vertical groove 145a.

The operation of the fuel filter device constructed as described above will now be described. Due to the operation of the fuel pump,
The fuel in the fuel tank reaches the inlet 101c of the atsupah body 101 through the fuel inlet section 106. Then, the inflow side portion of the valve body 110 is pushed up to enter the diaphragm chamber 112, and then the discharge side portion of the valve body 110 is pushed down to enter the case 102a of the filter assembly 102, and the water is passed through the central space of the element 102b into the diaphragm chamber 112. guided to the space 105,
While the fuel remains here, the water settles below the space 105 due to the difference in specific gravity between the water and the fuel, and the water is separated from the fuel.

After water has been separated from the fuel, the fuel is filtered and cleaned as it passes through the filter element 102b in the axial direction, and is led to the fuel pump and the engine through a fuel discharge port provided in the atsupah body 101.

When a certain amount of water settles in the water storage space 105, the float 103b of the level switch device 103 floats up and the reed switch 103c is activated by the magnet 103a. As a result, a warning light or a buzzer placed on an instrument panel or the like warns the driver of the presence of a predetermined amount of water. In response to this warning, turn the drain plug 145 and operate the operating member 11 of the hand pump 104.
8 is moved up and down to displace the diaphragm 109 and cause pressure fluctuations within the diaphragm chamber 112. As a result, the discharge side portion of the valve body 110 opens intermittently to apply pressure to the water surface, so that water is discharged from the vertical groove 145a of the drain plug 145.

By the way, the hand pump 104 is used not only to drain drain water, but also to pump fuel into the filter assembly 10 when the filter assembly 102 is replaced with a new one.
Used to temporarily supply the inside of 2. Note that during steady state, the inside thereof constitutes a part of the fuel system path, as described above.

(Operation of the device) As is clear from the above description based on the embodiments, the present invention is capable of sealing an opening by engaging a stopper with an external thread with an internal thread inside the opening and sandwiching the sealing material between the two. In the sealing plug structure, a cylindrical part with a plurality of ribs is formed around the opening, a nut-shaped member is formed into a cylindrical shape with an elastic member, and a position facing each rib on the outer periphery of this member is formed. A notch is provided in the top to form a flexible lip.

With this configuration, when placing the nut-shaped member inside the opening, the lip part is aligned with the position of each rib of the cylindrical part and the nut-shaped member is pressed with a constant load. It is possible to fit and hold the parts. That is, the nut-shaped member fits into the cylindrical part while each lip part is bent by the rib by pressing, and when the lip part gets over each rib, the rib and the edge of the lip part are engaged. The axial movement of the nut-shaped member is suppressed, and the rib and the notch engage with each other to suppress the movement of the nut-shaped member in the circumferential direction, thereby holding the nut-shaped member in a predetermined position.

(Effects of the invention) With the above-described configuration and operation, the present invention has a simple structure and easy operation without using methods such as integral molding or welding that have disadvantages in processing costs and rigidity of members such as containers. The nut-like member can be held at a position inside the opening, and an inexpensive and reliable sealing structure can be provided. Further, by forming the nut-shaped member from a material such as synthetic resin, it is possible to further reduce the weight and cost of this sealing plug structure.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view showing the main parts of an embodiment of the sealing structure according to the present invention, Fig. 2a is a plan view of a nut-shaped member used in the embodiment of Fig. 1, and Fig. 2b is in Fig. 2a. FIG. 3 is a cross-sectional side view showing the main parts of the container used in the embodiment of FIG. 1, and FIG. 4 is a cross-sectional side view showing the main parts of the conventional sealing structure. 1 and 5 are partial cross-sectional side views showing an embodiment in which the present invention is applied to a fuel filter device. In the figure, 1...container, 2...nut-shaped member, 3...
...Sealing material, 4...Plug, 5...Rib,
6...Rip part, 7...Tapered shape, 10...
Cylindrical part, 102...Case, 120...Cylindrical part, 203...O ring, 204...Plug, 2
05...Rib, 206...Rip part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A nut-shaped member having an internal thread disposed inside the opening of a wall member such as a container so as to align with the opening, and the internal thread of the nut-shaped member. A flange portion of the plug and a wall member surrounding the opening, comprising a plug having an external thread that can be screwed together, and an annular sealing material, the flange portion of the plug being screwed into the nut-shaped member from the outside of the wall member through the opening. In the sealing structure in which the opening is sealed by sandwiching the sealing material between a cylindrical portion having a plurality of ribs spaced apart from each other and extending in the circumferential direction of the cylindrical portion; the nut-shaped member is made of an elastic material; The nut-shaped member is formed into a cylindrical shape that can be fitted into the cylindrical portion and has an outer diameter larger than the inner diameter of the cylindrical portion of the rib, and is formed on the outer periphery of the nut-shaped member at a position facing each rib of the cylindrical portion. A notch extending in the axial direction with a width corresponding to the length of each rib is provided so that the outer periphery of the nut-shaped member on the distal end side in the direction in which the nut-shaped member is inserted into the cylindrical portion is flexible, and after the nut-shaped member is inserted into the tubular portion, The nut-like member is formed in a lip portion having an edge that can be engaged with the rib, and the nut-like member is connected to the cylindrical portion by the engagement between the notch and the rib and the engagement between the edge of the lip portion and the rib. A sealing plug structure characterized by being held in a mated position inside. (2) The sealing plug structure according to claim 1, wherein the wall member is made of a metal material, and the nut-shaped member is made of an elastic synthetic resin material. (3) Utility model registration claim 1 or 2, wherein the bottom of the cylindrical portion around the opening is recessed inward of the cylindrical portion so as to receive the annular sealing material. Sealing structure as described in section. (4) The outer surface of the lip portion of the nut-shaped member is
The sealing plug structure according to any one of claims 1 to 3, which is tapered in the direction of insertion into the cylindrical portion.