JP7162511B2 - Piping connection structure - Google Patents

Description

The present invention relates to a piping connection structure.

Conventionally, when connecting a pipe to a pottery such as a toilet bowl or a washbasin, the pipe is inserted into a through-hole formed in the surface of the pottery and fixed. The pipe is fastened by a fixing member such as a nut with an elastic member and a washer interposed around the through-hole, thereby being pressed and fixed by the elastic member and the washer (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2008-303616

Since pottery is formed by firing, fine irregularities and slopes are formed on the surface, and manufacturing errors are likely to occur depending on the individual pottery. In order to bring the elastic member into close contact with the surface of the pottery, the surface shape of the pottery must be uniform. Therefore, a high degree of precision is required for the surface shape of the pottery, and there is a possibility that the production yield of pottery such as toilet bowls will be low. Therefore, there is a demand for a pipe connection structure that can easily prevent unevenness in which the elastic member is lifted from the surface of the pottery when the fixing member is fixed to the pottery via the elastic member.

The present invention provides a pipe connection structure (for example, a pipe connection structure (for example, , a pipe connection structure 1) described later, which includes an insertion portion (for example, an insertion portion 51 described later) that is inserted into the through hole, and a diameter that is expanded from the insertion portion and can abut around the through hole. a cylindrical elastic member (for example, an elastic member 5 described later) having a hollow portion through which the pipe is inserted; a fixing member (for example, a nut 4 to be described later) that fixes the elastic member in a state in which the pipe is inserted and connects the pipe to the through hole; A thickness dimension along the insertion direction of the pipe (for example, a thickness dimension T1 described later) is larger than a thickness dimension (for example, a thickness dimension T2 described later) substantially perpendicular to the insertion direction of the pipe in the insertion portion. , relating to a piping connection structure.

It is preferable that an annular inner bead portion (for example, an inner bead portion 52 to be described later) protruding inward is formed on the inner wall surface of the hollow portion of the contact portion.

The contact portion is formed in a planar shape, and a washer portion (for example, a washer portion 61 to be described later) and the washer portion are arranged on a surface opposite to a surface of the contact portion that contacts the circumference of the through hole. It is preferable to have a washer with guide (eg, washer 6 with guide described later) having a guide portion (eg, guide portion 62 described later) that protrudes from the peripheral edge of the contact portion and extends along the outer peripheral surface of the contact portion.

The fixing member is made of resin, and includes an insertion hole (for example, an insertion hole 41 to be described later) through which the pipe is inserted, and a bearing surface portion (for example, a and a fastening portion (for example, a fastening portion 43 to be described later) that rises from the seating surface along the pipe insertion direction and is fastened with a tool.

Preferably, the fixing member has a hollow portion (for example, a hollow portion 432 described later) partially formed between the insertion hole in the fastening portion and the outer surface of the fastening portion.

A maximum width dimension (for example, a maximum width dimension W1 described later) of the fastening portion in a direction orthogonal to the insertion direction of the pipe is larger than an inner diameter of the through-hole of the pottery (for example, an inner diameter D described later). is preferred.

The maximum width dimension in the direction orthogonal to the insertion direction of the pipe in the fastening portion is narrower than the maximum width dimension in the direction orthogonal to the insertion direction of the pipe in the seat portion (for example, the maximum width dimension W2 described later). Preferably, the maximum width dimension of the fastening portion is 70% to 100% of the maximum width dimension of the seat portion.

ADVANTAGE OF THE INVENTION According to this invention, the connection structure of the piping which can prevent the unevenness of the surface of earthenware and an elastic member easily can be provided.

It is a figure which shows the toilet device with which the connection structure of the piping of this embodiment was used. It is a sectional view of the connection structure of piping of this embodiment. It is a sectional view of the elastic member of this embodiment. The nut of this embodiment is shown, (a) figure is a perspective view of a nut, (b) figure is sectional drawing. FIG. 4 is a cross-sectional view showing a state in which each portion of the pipe in the pipe connection structure of the present embodiment is deformed.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a toilet bowl 100 in which the pipe connection structure 1 of the present embodiment is used.
The toilet bowl 100 has a toilet bowl body 101 and a rear upper surface portion 102 .
The toilet body 101 has a bowl portion with an open top, and is entirely made of ceramic. As shown in FIG. 1 , through holes 103 and 104 are formed in the upper rear part of the toilet body 101 through which pipes 2 and 105 for supplying flush water to the toilet body 101 are inserted. As shown in FIG. 1, the pipe 2 of the present embodiment described below is inserted through the upper through-hole 103, and the jet pipe for generating jet water flow in the toilet body 101 is inserted through the lower through-hole 104. 105 is inserted.

The rear upper surface portion 102 is arranged on the upper rear side of the toilet body 101 and is a surface for fixing a component that supplies the toilet body 101 with water for flushing the toilet body 101 . Specifically, a water supply valve (not shown) is arranged on the rear upper surface portion 102 , and this water supply valve is connected to the pipes 2 and 105 .

A pipe connection structure 1 is a structure for connecting a pipe 2 to a through hole 103 formed in the surface of a toilet body 101 , and is composed of the through hole 103 of the toilet body 101 and the pipe 2 .
The pipe 2 has a hose portion 21 one end of which is connected to a water supply source via a water supply valve, and a rim nozzle 3 arranged at the other end of the hose portion 21 and fixed by being inserted through a through hole 103 of the toilet body 101. .
FIG. 2 is a cross-sectional view of the pipe connection structure 1. As shown in FIG. As shown in FIG. 2, the rim nozzle 3 includes a rim nozzle body 30, a nut 4 as a fixing member, an elastic member 5, a washer 6 with a guide, a retainer 7, a backup ring 8, and a nozzle cap 9. , has

The rim nozzle body 30 is a tubular adapter that is inserted through the through hole 103 and fixed while being connected to the end of the hose portion 21 . Washing water is supplied from the hose portion 21 side of the rim nozzle body 30 and flows toward the end portion on the side opposite to the hose portion 21 . The diameter of the rim nozzle body 30 is formed to be larger on the downstream side where it is inserted into the through hole 103 of the toilet body 101 than on the upstream side where it is connected to the hose portion 21 . The outer surface of the rim nozzle body 30 is formed with grooves and protrusions corresponding to the shape of the component with which the rim nozzle body 30 engages. Specifically, on the upstream side of the rim nozzle main body 30, a screw groove 31 is formed to engage with the nut 4, which will be described later, and on the downstream side, a flange-shaped projection with which the retainer fitting 7, which will be described later, engages is formed. 32 are formed.

FIG. 3 is a cross-sectional view of the elastic member 5. As shown in FIG. The elastic member 5 is a tubular rubber flat packing having a hollow portion 54 on the center side and having a flange. As shown in FIG. 3 , the elastic member 5 has an insertion portion 51 , an inner bead portion 52 and a contact portion 53 . The rim nozzle body 30 is inserted through the hollow portion 54 of the elastic member 5 .

The insertion portion 51 is a substantially cylindrical portion that is inserted into the through hole 103 and extends along the insertion direction in which the rim nozzle main body 30 is inserted. As shown in FIG. 2 , when the insertion portion 51 is inserted through the through hole 103 of the toilet body 101 , a gap S is formed between the insertion portion 51 and the periphery of the through hole 103 .

The contact portion 53 is a portion on one side of the insertion portion 51 that expands in diameter from the insertion portion 51 in a flange shape. As shown in FIG. 2 , the contact portion 53 is a portion that can contact the surface of the toilet body 101 around the through hole 103 while the insertion portion 51 is inserted into the through hole 103 . The abutment portion 53 has a planar surface that is bent from the insertion portion 51 and has a flat surface, and contacts the surface of the toilet body 101 . Further, the surface of the upstream side opposite to the side in contact with the surface of the toilet bowl body 101 is also formed in a flat planar shape, and a washer 6 with a guide, which will be described later, abuts thereon.

The contact portion 53 has a thickness T1 of about 4 mm to 8 mm in the direction along which the rim nozzle body 30 is inserted. It is larger than the thickness dimension T2 in the direction substantially orthogonal to the direction, that is, the thickness dimension of the tube of the insertion portion 51 .

The inner bead portion 52 is an annular projection formed on the inner wall surface of the hollow portion 54 of the contact portion 53, as shown in FIG. The inner bead portion 52 is formed by two vertically separated rings projecting inward from the inner wall surface of the hollow portion 54 . The inner bead portion 52 presses against the outer surface of the rim nozzle body 30 when the rim nozzle body 30 is inserted into the hollow portion 54 .

The guide washer 6 is arranged on the upstream side of the contact portion 53 of the elastic member 5 . The guide washer 6 is made of resin and has a substantially annular shape, and has a washer portion 61 , a guide portion 62 and a through hole 63 .

The washer portion 61 is arranged on the surface of the elastic member 5 opposite to the side of the contact portion 53 contacting the surface of the toilet body 101 . The washer portion 61 is arranged to overlap the contact portion 53 so as to cover the contact portion 53 . The washer portion 61 has an outer diameter substantially the same as or slightly larger than that of the contact portion 53 .

The guide portion 62 is a side wall that protrudes from the peripheral edge of the washer portion 61 and extends along the outer peripheral surface of the contact portion 53 . The guide portion 62 extends in a direction substantially orthogonal to the surface of the washer portion 61 and is arranged to at least partially cover the side surface of the contact portion 53 .

The through hole 63 is a circular hole formed on the center side of the washer portion 61 and the guide portion 62, and the rim nozzle main body 30 is inserted therethrough.

The retainer metal fitting 7 is an annular metal fitting formed with a substantially oval through hole 71 through which the rim nozzle body 30 is inserted on the center side. The retainer fitting 7 has an extending portion 72 extending on the downstream side of the through hole 103 on the surface of the toilet body 101 so as to be able to contact the surface surrounding the through hole 103 . When the rim nozzle body 30 is inserted into the through hole 71 , the retainer fitting 7 abuts on a flange-like projection 32 formed on the downstream side of the rim nozzle body 30 , and the extending portion 72 contacts the surface around the through hole 103 . By abutting on the downstream side of the rim nozzle body 30, it is possible to prevent the rim nozzle body 30 from coming off to the upstream side.

The backup ring 8 is an annular metal fitting formed with a through hole 81 through which the rim nozzle body 30 is inserted. The backup ring 8 is thinner than the retaining metal fitting 7 and has a substantially circular outer shape. The backup ring 8 supports the elastic member 5 when the elastic member 5 is deformed.

The nozzle cap 9 is a cap that covers the downstream end of the rim nozzle body 30 and has a bottomed cylindrical shape. The nozzle cap has a cap opening 91 , a cap bottom 92 and a cap side 93 .
Cap opening 91 receives the downstream end of rim nozzle body 30 .
The cap bottom 92 is a substantially circular surface with which the downstream end of the rim nozzle body 30 abuts, and is formed with a plurality of through holes 94 for discharging flush water toward the inside of the toilet body 101 .
The cap side surface portion 93 is a substantially cylindrical portion along the downstream side surface of the rim nozzle body 30 .

FIG. 4(a) is a perspective view of the nut 4, and FIG. 4(b) is a sectional view. As shown in FIG. 4( a ), the nut 4 is made of resin and has a rim nozzle body insertion hole 41 as an insertion hole, a seat surface portion 42 and a fastening portion 43 .

The rim nozzle main body insertion hole 41 is a cylindrical through hole through which the rim nozzle main body 30 is inserted into the nut 4 . A screw groove 41a on the side of the nut 4 corresponding to the screw groove 31 formed on the outer peripheral surface of the upstream side of the rim nozzle body 30 is formed on the inner peripheral surface of the rim nozzle body insertion hole 41, and the nut 4 can be rotated. engages the rim nozzle body 30 at .

The seat surface portion 42 has a flat surface that contacts the upstream side surface of the guide washer 6 as a contact portion of the member with which the nut 4 contacts, and is formed in a substantially circular shape in plan view.

The fastening portion 43 is a substantially hexagonal columnar portion formed on the upstream side surface of the seat surface portion 42 . The fastening portion 43 rises from the seat surface portion 42 along the insertion direction of the rim nozzle main body 30 and is fastened with a tool.

As shown in FIGS. 4A and 4B, the fastening portion 43 has a hollow portion 432 partially formed between the rim nozzle body insertion hole 41 and the outer surface of the fastening portion 43. , is formed in a so-called lightening shape. Specifically, a plurality of radially extending inner walls 431 are formed between the rim nozzle body insertion hole 41 and the outer surface of the fastening portion 43, and hollow portions 432 are formed between adjacent inner walls 431. be. By forming the hollow portion 432 on the outside of the rim nozzle body insertion hole 41, the size of the fastening portion 43 itself, that is, the distance connecting the facing corners of the hexagonal shape of the fastening portion 43 is formed large.

As shown in FIG. 2 , the fastening portion 43 has a maximum width dimension W1 in a direction orthogonal to the insertion direction of the rim nozzle body 30 in the fastening portion 43 that is larger than the inner diameter D of the through hole 103 of the toilet body 101 .

Further, the fastening portion 43 has a maximum width dimension W1 in a direction orthogonal to the insertion direction of the rim nozzle body 30 in the fastening portion 43, which is narrower than a maximum width dimension W2 in the direction orthogonal to the insertion direction of the rim nozzle body 30 in the seating surface portion 42. . Specifically, the maximum width dimension W1 of the fastening portion 43 is 70% to 100% of the maximum width dimension W2 of the seat surface portion 42, preferably about 70% to 80%.

Next, a procedure for fixing the pipe 2 in the pipe connection structure 1 will be described.
As shown in FIG. 2, the nozzle cap 9 is fitted to the downstream end of the rim nozzle main body 30, and the retainer fitting 7 and the backup ring 8 are superimposed on the projections 32 on the outer surface of the rim nozzle main body 30. Then, the rim nozzle main body 30 is inserted into the through hole 103 from the inner side of the toilet bowl main body 101 toward the outer side.

With the upper end side of the rim nozzle body 30 protruding outside the through hole 103 of the toilet bowl body 101, the insertion part 51 of the elastic member 5 is passed through the rim nozzle body 30, and then the through hole 63 of the washer 6 with guide is passed. When the insertion portion 51 of the elastic member 5 and the through hole 63 of the washer 6 with guide are passed through the rim nozzle main body 30 , the washer 6 with guide covers the upstream surface of the contact portion 53 of the elastic member 5 . At this time, the annular inner bead portion 52 formed in the insertion portion 51 of the elastic member 5 is in close contact with the outer peripheral surface of the rim nozzle main body 30 .

Next, while passing the rim nozzle body 30 through the rim nozzle body insertion hole 41 of the nut 4 , the thread groove 41 a formed in the inner peripheral surface of the rim nozzle body insertion hole 41 is engaged with the thread groove 31 of the rim nozzle body 30 . At this time, the builder initially rotates the nut 4 by hand or the like, but when the engagement becomes tight, a tool is used to pinch the outer side of the fastening portion 43 of the nut 4 and rotate it. In this way, the pipe 2 is connected to the through hole 103 by fixing the elastic member 5 and the guide washer 6 with the nut 4 in a state where the rim nozzle 3 is inserted into the through hole 103 of the toilet body 101 .

FIG. 5 is a cross-sectional view of a state in which the nut 4 is firmly tightened from the state in FIG. Since the surface of the toilet bowl main body 101 is made of ceramics, it may have irregularities, slopes, or the like. In this case, in order to bring the elastic member 5 into close contact with the surface of the toilet body 101, the nut 4 is generally tightened with a strong torque. However, as shown in FIG. 4, if the maximum width of the fastening portion 43 is 70% to 100% with respect to the seat surface portion 42 of the nut 4, even if the nut 4 is tightened with a strong torque, the seat surface portion 42 will not move. Not easy to crush. In FIG. 4, the seat surface portion 42 is bent so that the rim nozzle body insertion hole 41 side is recessed, but the deformation is only slight.

Further, the guide portion 62 of the washer 6 with guide extends so as to contact the outer peripheral surface of the contact portion 53 of the elastic member 5 . In this state, as shown in FIG. 4, even if the elastic member 5 is crushed by being tightened from the nut 4 side, the guide portion 62 of the washer 6 with guide prevents the elastic member 5 from expanding radially outward. 5 is pressed, the elastic member 5 presses the surface of the toilet body 101 without being flattened.

In addition, the thickness dimension T1 of the contact portion 53 of the elastic member 5 in the direction along the insertion direction of the rim nozzle body 30 is thicker than the thickness dimension T2 of the insertion portion 51 in the direction orthogonal to the insertion direction of the rim nozzle body 30. Therefore, even when pressed by the nut 4, the force of the abutting portion 53 to retain its shape is sufficiently exerted on both the guide washer 6 and the surface of the toilet body 101, so that the surface of the toilet body 101 is maintained. Sufficient pressure can be secured. For example, when the nut 4 is tightened with a torque of 5±0.5 N·m, the height of the uneven portion that is not in contact with the surface of the toilet body 101 can be absorbed up to 1.5 mm.

After the nut 4 has been attached, the upstream end side of the rim nozzle body 30 is connected to the hose portion 21 .

According to this embodiment, the following effects are obtained.
In this embodiment, the pipe connection structure 1 for connecting the pipe 2 to the through-hole 103 formed on the surface of the toilet body 101 includes an insertion portion 51 inserted into the through-hole 103 and an insertion portion 51 having a diameter enlarged from the insertion portion 51. A cylindrical elastic member 5 having a contact portion 53 capable of contacting around the through hole 103 and having the pipe 2 inserted into the hollow portion 54 , and the pipe 2 being inserted into the through hole 103 . , and a nut 4 that fixes the elastic member 5 and connects the pipe 2 to the through hole 103 . In addition, the thickness dimension T1 of the contact portion 53 of the elastic member 5 along the insertion direction of the pipe 2 is configured to be larger than the thickness dimension T2 of the insertion portion 51 substantially orthogonal to the insertion direction of the pipe 2 .
The thickness dimension T1 of the contact portion 53 along the insertion direction of the rim nozzle body 30 is larger than the thickness dimension T2 of the insertion portion 51 substantially perpendicular to the insertion direction. If the accuracy is not high, even if a large uneven portion is formed where the contact portion 53 does not adhere to the surface of the toilet bowl body 101, the thick contact portion 53 is pushed by the nut 4 and deforms to remove the uneven portion. can be absorbed.
In addition, since the elastic member 5 can be easily brought into close contact with the surface of the toilet body 101, it is not necessary to require high accuracy for the surface shape of the toilet body 101, so that the production yield of the toilet body 101 is improved.

In this embodiment, an annular inner bead portion 52 protruding inward is formed on the inner wall surface of the hollow portion 54 of the contact portion 53 . Since the inner bead portion 52 presses the outer surface of the rim nozzle body 30 of the pipe 2 , the elastic member 5 is in close contact with the rim nozzle body 30 . Therefore, the force applied to the elastic member 5 by the nut 4 can be transmitted to the surface of the toilet body 101 without being released, and the same effect as described above can be obtained.

In this embodiment, the contact portion 53 is formed in a flat shape, and the washer portion 61 is arranged on the surface opposite to the surface of the contact portion 53 that contacts the periphery of the through hole 103, and the peripheral edge of the washer portion 61 It includes a guide washer 6 having a guide portion 62 that protrudes and extends along the outer peripheral surface of the contact portion 53 .
Since the flat contact portion 53 is in surface contact with the periphery of the through hole 103 of the toilet body 101 , sufficient surface pressure can be applied to the periphery of the through hole 103 of the toilet body 101 .
Furthermore, the elastic member 5 having the contact portion 53 and the guide washer 6 having the guide portion 62 extending along the outer peripheral surface of the contact portion 53 are fixed with the nut 4 . Then, since the guide part 62 of the washer with a guide restrains the circumference of the elastic member 5, it is possible to prevent the elastic member 5 from being pushed by the nut 4 and escaping sideways, and being flattened. Therefore, the force applied to the elastic member 5 by the nut 4 can be transmitted to the surface of the toilet body 101 without being released, and the same effect as described above can be obtained.

In this embodiment, the fixing member is a nut 4 made of resin. Also, an insertion hole 41 through which the rim nozzle body 30 is inserted, a seat surface portion 42 that abuts against the guide washer 6, a fastening portion 43 that rises from the seat surface portion 42 along the insertion direction of the pipe 2 and is fastened with a tool, composed of
By using the resin nut 4 as the fixing member, the manufacturing cost can be reduced, and molding is facilitated, so that the seat surface portion 42 and the fastening portion 43 can be easily molded.
In addition, the thick contact portion 53 is pushed by the nut 4 and deformed, making it easier to absorb the uneven portion. As a result, even if the fixing member such as the nut 4 is made of resin, it has sufficient durability and the manufacturing cost can be reduced. In addition, since it can be fixed with a light force during construction, the work load on the construction worker is also reduced. Fastening the nut 4 with a tool facilitates the fixation of the elastic member 5, thereby improving workability.

In this embodiment, the nut 4 is configured to include a hollow portion 432 partially formed between the rim nozzle body insertion hole 41 in the fastening portion 43 and the outer surface of the fastening portion 43 .
When the hollow portion 432 is formed between the rim nozzle body insertion hole 41 in the fastening portion 43 and the outer surface of the fastening portion 43, the width of the fastening portion 43 in the direction orthogonal to the insertion direction of the rim nozzle body 30 is consequently reduced. becomes wider. If the width of the fastening portion 43 is relatively wide with respect to the width of the seat surface portion 42, the degree of deflection of the seat surface portion 42 when the nut 4 is fastened is reduced. When the deformation of the bearing surface portion 42 of the nut 4 is suppressed, the elastic member 5 in contact with the bearing surface portion 42 of the nut 4 is sufficiently pressed. Therefore, even a small torque can sufficiently press the elastic member 5, and the same effects as described above can be obtained.

In this embodiment, the maximum width dimension W1 of the fastening portion 43 in the direction perpendicular to the insertion direction of the rim nozzle body 30 is made larger than the inner diameter D of the through hole 103 of the toilet body 101 .
By making the maximum width dimension W1 of the fastening portion 43 larger than the inner diameter D of the through hole 103 of the toilet body 101, it is possible to effectively reduce the degree of bending of the seat portion 42 when the nut 4 is fastened. . Therefore, even a small torque can sufficiently press the elastic member 5, and the same effects as described above can be obtained.

In this embodiment, the maximum width dimension W1 of the fastening portion 43 in the direction orthogonal to the insertion direction of the rim nozzle body 30 is formed narrower than the maximum width dimension W2 of the seat portion 42 in the direction orthogonal to the insertion direction of the rim nozzle body 30. , the maximum width dimension W1 of the fastening portion 43 is set to 70% to 100% of the maximum width dimension W2 of the seat surface portion 42.
By setting the maximum width dimension W1 of the fastening portion 43 to 70% to 100% of the maximum width dimension W2 of the seating surface portion 42, the degree of bending of the seating surface portion 42 when the nut 4 is fastened is effectively reduced. can be done. Therefore, even a small torque can sufficiently press the elastic member 5, and the same effects as described above can be obtained.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate.
For example, in the above embodiment, the pipe 2 has the rim nozzle 3, but the pipe 2 is not limited to the rim nozzle. For example, the piping may have a jet nozzle, and the jet nozzle may be provided with the elastic member and guide washer of the present invention.

Further, in the above embodiment, the nut 4 is used as an example of the fixing member, but the fixing member is not limited to the nut. Any other component may be used as long as it can fix the elastic member 5 and the guide washer 6 with the pipe 2 inserted into the through hole 103 .

Moreover, although the fixing member is made of resin in the above embodiment, it is not limited to resin. It may be made of metal or other material.
Further, in the above embodiment, the member with which the nut 4 abuts is described as being the washer 6 with guide, but it is not limited to the washer 6 with guide. It may be in contact with other parts that connect pipes, such as washers and packings.

1 piping connection structure 2 piping 4 nut (fixing member)
5 elastic member 6 washer with guide 41 rim nozzle body insertion hole (insertion hole)
42 seat surface portion 43 fastening portion 51 insertion portion 52 inner bead portion 53 contact portion 54 hollow portion 61 washer portion 62 guide portion 101 toilet body (ceramic)
103 through hole 432 hollow part

Claims (7)

A pipe connection structure for connecting a pipe to a through hole formed in the surface of the pottery,
A cylindrical tubular body having an insertion portion to be inserted into the through-hole and an abutment portion that is enlarged in diameter from the insertion portion and can be in contact with the periphery of the through-hole, and has a hollow portion through which the pipe is inserted. an elastic member;
a fixing member that fixes the elastic member and connects the pipe to the through hole in a state where the pipe is inserted into the through hole;
In the pipe connection structure, the elastic member has a thickness dimension along the insertion direction of the pipe at the abutting portion that is larger than a thickness dimension at the insertion portion substantially orthogonal to the insertion direction of the pipe. 2. The pipe connection structure according to claim 1, wherein an inner wall surface of said hollow portion in said abutting portion is formed with an annular inner bead portion projecting inward. The contact portion is formed in a planar shape,
A guide having a washer portion disposed on a surface of the contact portion opposite to the surface contacting the periphery of the through hole, and a guide portion protruding from the peripheral edge of the washer portion and extending along the outer peripheral surface of the contact portion. 3. The piping connection structure according to claim 1, further comprising an attached washer. The fixing member is made of resin, and includes an insertion hole through which the pipe is inserted, a seat portion that abuts against a contact portion of the member that the fixing member contacts, and a The pipe connection structure according to any one of claims 1 to 3, further comprising a fastening portion that stands up and is fastened with a tool. 5. The pipe connection structure according to claim 4, wherein said fixing member has a hollow portion partially formed between said insertion hole in said fastening portion and an outer surface of said fastening portion. The pipe connection structure according to claim 4 or 5, wherein a maximum width dimension of the fastening portion in a direction orthogonal to the insertion direction of the pipe is larger than an inner diameter of the through hole of the pottery. The maximum width dimension of the fastening portion in a direction perpendicular to the pipe insertion direction is formed narrower than the maximum width dimension of the seat portion in the direction perpendicular to the pipe insertion direction,
The pipe connection structure according to any one of claims 4 to 6, wherein the maximum width dimension of the fastening portion is 70% to 100% of the maximum width dimension of the seat portion.

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