JP4434930B2 - Seal structure of seal member and connection part - Google Patents

Description

  The present invention relates to a seal member used for a connection portion formed by inserting an end portion of a first tubular body into an end portion of a second tubular body that is softer than the first tubular body.

  Conventionally, as one method of simply connecting two tubular bodies, it is known to insert the end of one tubular body into the end of the other tubular body. In such a method, one tubular body is a hard tubular body such as a metal pipe, and the other tubular body is such that at least the innermost layer such as a rubber hose is formed of an elastic body. This is particularly effective when the tubular body is softer than the tubular body. That is, by selecting and connecting a tubular body having an inner diameter slightly smaller than the outer diameter of one tubular body as the other tubular body, the elastic body changes along the shape of the outermost surface of the one tubular body. The sealing property of the connection part between the tubular bodies can be ensured. Further, the pressure resistance can be further enhanced by fixing the connecting portion from the outside of the tubular body with a hose band or the like.

  On the other hand, in recent years, a tubular body in which a resin is applied to the innermost layer instead of rubber is increasing because it is excellent in durability, hygiene, chlorine resistance and the like. When such a tubular body is connected to a hard tubular body as described above, since the resin is inferior in flexibility, elasticity, and compression set characteristics compared to rubber, a gap is likely to occur in the connecting portion, and the tubular body There was a risk of leakage of liquids and gases in the body.

  For such a problem, rubber or resin is the main component on the innermost surface of the end of the tubular body having a resin layer as the innermost layer, or means for providing a rubber O-ring on the outer side of the rigid tubular body. Means (for example, refer to Patent Document 1) for improving the sealing performance of the connecting portion by providing a fixing layer has been studied.

Japanese Patent Laid-Open No. 9-100959

  However, when a rubber O-ring is provided outside the hard tubular body, the hard tubular body is often already installed at home or the like, so the tubular body itself having the O-ring is replaced with the existing tubular body. It was necessary to make a new connection by welding or the like. For this reason, it takes much labor and cost to connect only two tubular bodies.

  On the other hand, the means for providing the fixing layer on the innermost inner surface of the end of the tubular body is very troublesome because a process for providing the fixing layer is required for each tubular body to be used. In addition, since the required length of the tubular body changes depending on the site where the tubular body is used, it is difficult to determine the dimensions of the tubular body in advance and to provide a fixing layer, especially when performing on-site. When the length of the tubular body to be used is changed, there is a problem that it cannot be handled.

  This invention is made | formed in view of the said subject, and it aims at providing the sealing member which can connect a tubular body easily, maintaining favorable sealing performance.

The first characteristic configuration of the seal member according to the present invention includes a metal first tubular body having an end portion bulging in a radially outward direction, and a resin-made end portion having a uniform inner diameter in the length direction. when circulating the hot water and connected to the second tubular member, and used the end of the first tubular member to a connecting portion formed by inserting the end of the second tubular member, prior Symbol first It met sealing member includes an outer peripheral surface and the inner peripheral surface of the second tubular member and the tubular body portion which is sandwiched between, and a flange portion can come into contact with the side surface of the second tubular member of the tubular body The cylindrical main body has a flat outer peripheral surface and an inner peripheral surface, and the first tubular body is inserted to follow the shape of the end of the first tubular body. The inner peripheral surface of the two tubular bodies is configured to expand and deform, and the compression set is less than the member constituting the inner peripheral surface of the second tubular body. It lies in the fact that you configured in Sai rubber.

The seal member of the present invention includes a cylindrical main body portion sandwiched between the outer peripheral surface of the first tubular body and the inner peripheral surface of the second tubular body, and the seal member is connected to the inner peripheral surface of the second tubular body. By using rubber having a compression set smaller than that of the member constituting the, the gap between the first tubular body and the second tubular body is satisfactorily filled. Further, even when the first tubular body or the second tubular body is deformed due to a change over time or the like, the rubber follows the change in the contact state between the two, and the sealing property between the two is maintained over a long period of time. Can do.
The compression set is a thickness before and after compression after compressing three test pieces of φ29 × 12.5 mm at 25% for 25 hours at 70 ± 1 ° C. according to JIS K 6262-5. And the ratio of the thickness not recovered to the compressed thickness was determined.

  Moreover, since the flange part which can contact | abut to the edge part side surface of a 2nd tubular body is provided, when inserting a 1st tubular body into a 2nd tubular body, the said flange part is an edge part side surface of a 2nd tubular body. To prevent the seal member from being drawn into the second tubular body. As a result, the sealing member is disposed at the optimum position in the connecting portion between the first tubular body and the second tubular body, and the gap between the two is reliably sealed.

  A second characteristic configuration of the seal member according to the present invention includes a cylindrical rising portion capable of sandwiching the second tubular body from the inside and outside in cooperation with the cylindrical main body portion at an outer peripheral edge of the flange portion. In the point.

If such a rising portion is provided, the seal member can be fitted to the end of the second tubular body. Therefore, when inserting the first tubular body into the seal member, the seal member can be temporarily fixed to the second tubular body, and the insertion operation of the first tubular body becomes extremely easy.
Further, when the first tubular body is inserted, a frictional force acts on the sealing member, but the sealing member is firmly fitted to the end portion of the second tubular body, thereby strongly resisting the frictional force. be able to. Thereby, even when the inner diameter of the sealing member is somewhat narrower than the outer diameter of the first tubular body, the sealing member is not drawn into the second tubular body with the insertion of the first tubular body. A suitable connection can be obtained.

  The 3rd characteristic structure of the sealing member which concerns on this invention exists in the point provided with the inclined part which taper | falls so that it separates from the said flange part in the outer surface of the said cylindrical main-body part.

  With this configuration, even when the outer dimension of the cylindrical main body is close to the inner diameter of the second tubular body, when the sealing member is inserted into the second tubular body, the distal end on the insertion side of the sealing member is the second. It is relieved that it catches on the inner peripheral surface of the tubular body. Therefore, the insertion operation of the seal member can be performed efficiently.

  The 4th characteristic structure of the sealing member which concerns on this invention exists in the point which provided the chamfering part in the edge part by which the said flange part was provided among the inner surfaces of the said cylindrical main-body part.

If it is this structure, when inserting a 1st tubular body with respect to a sealing member, it will be easy to guide the front-end | tip part of a 1st tubular body, and insertion of a 1st tubular body will become easy.
In addition, if the cross-sectional shape of the said chamfer part is a shape which can insert a 1st tubular body easily, it can be set arbitrarily.

The seal member according to the present invention may be inserted in advance into the end of the second tubular body. Thereby, when connecting a 1st tubular body and a 2nd tubular body, it is not necessary to mount | wear with a sealing member each time in a 2nd tubular body, and a connection operation | work becomes easy. In addition, it is difficult to cause inconveniences such as the absence of a seal member during connection work. Furthermore, the seal member of the present invention needs to be made of rubber having a smaller compression set than the member on the inner surface of the second tubular body, as described in the characteristic configuration 1 above. Therefore, by attaching the seal member to the second tubular body in advance, it is not necessary for the connection operator to care about both members, and the connection work between the tubular bodies can be made more efficient.

The characteristic structure of the sealing structure of the connecting portion according to the present invention is that the first tubular body made of metal having the end portion bulged in the radially outward direction and the resin having the same inner diameter uniformly in the length direction. The second tubular body, and the end of the first tubular body is inserted into the end of the second tubular body so that warm water is circulated between the first tubular body and the second tubular body. A sealing structure of a connecting portion, wherein the connecting portion is sandwiched between an outer peripheral portion of the first tubular body and an inner peripheral surface of the second tubular body, and an end portion of the second tubular body A flange member capable of abutting on the side surface, and the cylindrical main body portion is made of rubber having a compression set smaller than that of the member constituting the inner peripheral surface of the second tubular body, An outer peripheral surface and an inner peripheral surface of the cylindrical main body are formed flat, and the inner peripheral surface of the second tubular body is interposed through the cylindrical main body. Allowed to follow the shape of the end portion of the first tubular member is in that is expanded deformed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overview)
The seal member S of the present invention is interposed between the first tubular body 1 and the second tubular body 2 when the end of the first tubular body 1 is inserted into the end of the second tubular body 2. Thus, the seal between the two is surely performed. FIG. 1 shows how the seal member S is used. FIG. 2 shows details of a connecting portion using the seal member S.
In the present embodiment, for example, the first tubular body 1 is an example of a metal nipple 1a that supplies warm water for heating. A resin hose 2a as the second tubular body 2 is connected to the nipple 1a, and further, a heater provided with a heat exchanger (not shown) is connected to the resin hose 2a.

  Usually, the inner surface of the resin hose 2a is softer than the hardness of the surface of the nipple 1a. However, when the resin hose 2a is directly connected to the nipple 1a, the resin material has poor flexibility and elasticity, and the compression set is relatively large. Therefore, the inner peripheral surface of the resin hose 2a is relatively large with respect to the nipple 1a. Difficult to get used to. Further, the inner surface of the resin hose 2a is deformed due to a change over time or the like. Furthermore, an external force may be applied to the resin hose 2a, and the nipple 1a and the resin hose 2a may be misaligned. In such a case, a gap may be formed between the nipple 1a and the resin hose 2a, and hot water may leak out. The seal member S of the present invention prevents such leakage of the medium flowing through the inside.

  As shown in FIGS. 1 and 2, the seal member S of the present embodiment includes a cylindrical main body 3 having a cylindrical shape, and a flange 4 connected to one end of the cylindrical main body 3. Yes. The cylindrical main body 3 and the flange 4 are integrally formed. Among these, the cylindrical main-body part 3 is comprised with the rubber member whose compression permanent strain is smaller than the member which comprises the internal peripheral surface of the said resin-made hoses 2a. Usually, the inner peripheral surface of the second tubular body 2 is softer than the outer peripheral surface of the first tubular body 1, and the sealing member S is configured to be softer than the outer peripheral surface and the inner peripheral surface.

(Cylindrical body)
The cylindrical main body 3 is sandwiched between the outer peripheral surface of the nipple 1a and the inner peripheral surface of the resin hose 2a, and is subjected to compressive deformation in the thickness direction. This compressive deformation is kept within the elastic limit of the rubber member constituting the seal member S. As described above, the sealing member S of the present invention applies an appropriate pressure to the outer peripheral surface of the first tubular body 1 and the inner peripheral surface of the second tubular body 2 to securely seal between the two.
1 and 2 show a nipple 1a partially bulged as the first tubular body 1. FIG. However, in addition to this, the surface of the first tubular body 1 may have a plurality of irregularities or a simple cylindrical outer peripheral surface without irregularities. In short, any configuration may be used as long as the seal member S can be sandwiched between the outer peripheral surface of the first tubular body 1 and the inner peripheral surface of the second tubular body 2.

(Flange part)
As shown in FIG. 2, the flange portion 4 can be in contact with the end side surface 5 of the resin hose 2 a. When inserting the nipple 1a through the resin hose 2a, the seal member S is inserted in advance into the end of the resin hose 2a. In this state, the resin hose 2a is pushed into the nipple 1a. At this time, the flange portion 4 comes into contact with the end side surface 5 of the resin hose 2a, and the sealing member S is prevented from being drawn into the resin hose 2a. As a result, the seal member S is disposed at the optimum position in the connecting portion between the nipple 1a and the resin hose 2a. At this time, the nipple 1a and the resin hose 2a are not in direct contact with each other, and the gap between the two is reliably sealed.

For example, as shown in FIG. 2, the flange is preferably thicker than the cylindrical main body 3 to increase the rigidity. When the outer diameter of the nipple 1a is larger than the inner diameter of the cylindrical main body 3, friction with the cylindrical main body 3 increases during insertion into the nipple 1a. At this time, in order to resist the pull-in by the frictional force, it is necessary to provide a certain degree of rigidity.
Instead of increasing the thickness, rubber members having different hardnesses may be integrally formed with the cylindrical main body 3 to increase the rigidity of the flange 4.

As shown in FIG. 1, it is preferable that the outer surface of the cylindrical main body portion 3 is provided with an inclined portion 6 that tapers away from the flange portion. With this configuration, even when the outer dimension of the cylindrical main body 3 is close to the inner diameter of the second tubular body 2, the insertion side of the sealing member S is inserted when the sealing member S is inserted into the second tubular body 2. The tip portion is eased from being caught on the inner peripheral surface of the second tubular body 2. Therefore, the insertion operation of the seal member S can be performed efficiently.
Such an inclined portion 6 does not need to be provided over the entire area of the cylindrical main body portion 3. It may be formed only on the side opposite to the flange portion 4 and on the tip side when the seal member S is inserted.

As shown in FIG. 2, a chamfered portion 7 may be provided on the entire circumference of the inner peripheral surface of the cylindrical main body portion 3 on the side where the flange portion 4 is provided.
If it is this structure, when inserting the nipple 1a with respect to the sealing member S, it will be easy to guide the front-end | tip part of the nipple 1a, and insertion of the nipple 1a will become easy. The cross-sectional shape of the chamfered portion 7 is simple to have a partial conical shape as shown in FIG. Moreover, although illustration is abbreviate | omitted, you may have a trumpet-shaped curved surface. In short, the shape of the chamfered portion 7 can be arbitrarily set as long as the nipple 1a can be easily inserted.

(Material / Production method)
The seal member S of the present invention can be composed of various rubber members. The specific material may be appropriately selected such as a material having resistance to a medium circulating in the tubular body. For example, natural rubber (NR), ethylene propylene rubber (EPDM), butyl rubber (IIR), fluorine rubber (FKM), or the like can be used.

The seal member S is molded using a known method for obtaining a rubber product such as mold molding or injection molding.
For example, using EPDM having a durometer hardness of 30 to 95 degrees, a rubber material is put into a molding die, and thereafter, it can be molded by holding it under conditions of 19.8 MPa · 170 ° C. for 10 minutes. As long as the mold can form a plurality of sealing members S at a time, it is advantageous because the manufacturing efficiency is improved.

The flange member 4 of the seal member S attached to the end of the resin hose 2a is visible from the outside. Since the color of the rubber material to be used is arbitrary, for example, if the color is classified for each medium to be distributed to the resin hose 2a, there is no error in connecting the resin hose 2a, and a plurality of resin hoses 2a are connected even after connection. It is easy and easy to grasp the laying situation.
For example, when the seal member S is molded in black, carbon black may be mixed. If it is molded into white, a white pigment is mixed. In addition, various pigments and dyes can be used for arbitrary coloring.
Carbon black can also be used as a rubber reinforcing material, and silica can be added as a reinforcing material to rubbers other than black.

(Example of construction)
As the 1st tubular body 1, the thing of various shapes, such as a bead-processed copper pipe and a bamboo shoot-shaped nipple, can be used. In addition to copper, aluminum, brass, iron, stainless steel, or the like can be used as appropriate. Furthermore, polyacetal (POM), polyphenylene sulfide (PPS), polyphenylene ether (PPE), polyether ether ketone (PEEK), polypropylene (PP), polyethylene (PE), fluororesin, polyamide (PA), polyvinyl chloride (PVC) ) · Hard resins such as polysulfone, polyethersulfone, polycarbonate, etc. can also be used.

On the other hand, as the second tubular body 2, a resin hose 2a or a resin tube having a softer inner surface layer than the first tubular body 1 is used.
As the resin hose 2a, for example, a hose having a silane-crosslinked polyethylene layer on its inner and outer surfaces is used. These intermediate regions are provided with a reinforcing layer 8 in which various fibers are knitted as shown in FIG.
As the material of the resin hose 2a, for example, olefin resin (PE / PP, etc.), vinyl chloride resin, nylon, thermoplastic elastomer (TPE / TPO), etc. can be used.

  As shown in FIGS. 1 and 2, after the nipple 1a is connected to the resin hose 2a, the end of the resin hose 2a is fastened with the band member 9 or the like from the outside. Thereby, it can prevent reliably that a clearance gap produces between nipple 1a and resin-made hose 2a.

(Various tests)
(1) Water Leakage Test In Table 1, when a metal nipple 1a is used as the first tubular body 1 and a resin hose 2a and a rubber hose are used as the second tubular body 2, the inside of these circulates. The result of having tested how much the water leakage which carries out can be prevented with the sealing member S of this invention is shown.
As a sample, first, the hose was held at 100 ° C. for 4 days for aging treatment. After leaving this at 25 ° C. for 1 hour or longer, it was confirmed whether or not water leakage occurred when a pressure of 0.5 MPa was applied according to JIS K 6330-2 7.1.

  As the material of the resin hose 2a, cross-linked polyethylene, styrene TPE, olefin TPE, and vinyl chloride TPE (Group 1) are used. The rubber hose is made of rubber having a compression set smaller than that of the resin hose 2a. Some EPDM • IIR • SBR (Group 2) was used.

  According to this, water leakage occurred in all cases in the resin hose 2a of the group 1, whereas no water leakage occurred in the rubber hose of the group 2. And by using the sealing member S for the resin hose 2a of group 1, any water leakage could be prevented.

  Thus, it can be seen that if the sealing member S of the present invention is used, a satisfactory sealing function is exhibited even in the case of the resin hose 2a having a large compression set compared to a general rubber hose or the like. That is, by forming the seal member S with a material having a compression set smaller than that of the member constituting the resin hose 2a, the sealing performance can be improved and the pressure resistance performance can be enhanced as compared with the case of direct connection. .

And, the compression set (JIS K 6262-5) of the resin material of group 1 is a value larger than 30%, while the compression set (JIS K 6262-5) of the rubber material of group 2 is any. Is less than 30%.
Therefore, if the sealing member S is made of a rubber material having a smaller compression set than that of the member constituting the resin hose 2a, the sealing performance can be improved. However, the rubber material constituting the sealing member S is a compression set. Is preferably smaller. In particular, it is more preferable that the sealing member S is made of a rubber material having a compression set smaller than 30% as described above, because the sealing can be performed more reliably.

(2) Metal pull-out test When the first tubular body 1 is made of a metal nipple 1a and the second tubular body 2 is made of cross-linked polyethylene and the two are connected to each other, the seal member S ensures sufficient pull-out resistance. It was experimented whether it was done.
First, after attaching the resin hose 2a, which is the second tubular body 2, to the metal fitting having the same bulging portion as the first tubular body 1 shown in FIG. 1 and FIG. A prepared sample was prepared. As a sample subjected to aging treatment, a sample kept at 100 ° C. for 4 days after connection was used. After holding these samples at 25 ° C. and 90 ° C. for 1 hour or longer, both were pulled at a speed of 500 mm / min using a tensile tester, and the maximum tensile load was measured. The results are shown in Table 2.

  In a sample that does not use the seal member S, the maximum tensile load is not significantly reduced even after the resin hose 2a is aged. Rather, when it was pulled at 90 ° C., the tensile load of the aged sample was better than the normal one.

On the other hand, in the case of using the seal member S of the present invention, the tensile load was increased in both the normal sample and the sample subjected to aging treatment. In the tensile results at 25 ° C., the normal state increased by 179 N, and the aged one increased by 236 N. Even in the test at 90 ° C., although the numerical value was small, the tensile load was increased.
It turns out that the reliability of a connection part is improved significantly by using the sealing member S of this invention.

(3) Pressure resistance test An experiment was conducted to determine how much the sealing performance can be maintained by the seal member S when an internal pressure is applied to the connection portion between the first tubular body 1 and the second tubular body 2.
As a sample, first, an aging treatment was performed by holding the resin hose 2a equipped with the metal fitting at 100 ° C. for 4 days. After leaving this at 25 ° C. for 1 hour or longer, it was confirmed whether or not water leakage occurred according to JIS K 6330-2 7.1.

As a result, as shown in Table 2, those that do not use the sealing member S of the present invention cause water bleeding and leakage when the internal pressure becomes 0.3 MPa, and clear water leakage when higher internal pressure is applied. Produced.
On the other hand, when the seal member S of the present invention was used, water leakage was not observed even when the internal pressure was increased to 0.5 MPa, and it was confirmed that the seal member S exhibited good sealing properties.

[Another embodiment]
<1>
In the said embodiment, although the said flange part 4 was comprised only with the disk-shaped member, as shown in FIG. 3, it cooperates with the said cylindrical main-body part 3 in the outer periphery of the flange part 4, and the said 2nd tubular body. It is good also as providing the cylindrical rising part 10 which can clamp 2 from the inside and outside.
As shown in FIG. 3, a rising portion 10 that is substantially parallel to the cylindrical main body portion 3 is formed at the edge of the flange portion 4. It is preferable that the distance between the inner peripheral surface of the rising portion 10 and the outer peripheral surface of the cylindrical main body portion 3 is configured to be somewhat smaller than the thickness of the wall portion of the second tubular body 2. With this configuration, the sealing member S can be fitted to the end of the second tubular body 2. Therefore, when the first tubular body 1 is inserted into the seal member S, the sealing member S and the second tubular body 2 are relatively fixed in position, so that the operation of inserting the first tubular body 1 becomes extremely easy. .
Further, when the first tubular body 1 is inserted, a frictional force acts on the seal member S. However, since the seal member S is fitted to the end of the second tubular body 2, the frictional force is reduced. Increases resistance. Thereby, even when the inner diameter of the seal member S is somewhat narrower than the outer diameter of the first tubular body 1, the seal member S is drawn into the second tubular body 2 as the first tubular body 1 is inserted. In this case, a suitable tubular body connecting portion can be obtained.

<2> The sealing member S of the present invention can be inserted in advance into the end portion of the resin hose 2a which is the second tubular body 2.
If it is this structure, the connection operation | work with the 1st tubular body 1 will become easy. In addition, it is difficult to cause inconveniences such as the absence of the seal member S during the connection work.
Further, the seal member S of the present invention needs to be made of rubber having a compression set smaller than that of the member on the inner surface of the second tubular body 2. Therefore, by attaching to the resin hose 2a in advance, the connection operator of the resin hose 2a does not need to worry about both members, and the tubular bodies can be connected efficiently.

  In order to circulate a medium such as liquid or gas, the seal member of the present invention is connected to, for example, a first tubular body provided on a wall or various devices and a second tubular body that is softer than the first tubular body. Used to maintain the sealing performance of the part. Particularly preferably, it is suitable for connecting a pipe having poor elasticity compared to a conventional rubber hose or the like, for example, the second tubular body is a resin hose.

The figure which shows the usage condition of the sealing member of this invention The figure which shows the detail of the connection part using the sealing member of this invention The figure which shows the external appearance of the sealing member which concerns on another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st tubular body 2 2nd tubular body 3 Cylindrical main-body part 4 Flange part 5 End part side surface 6 Inclination part 7 Chamfering part 10 Rising part S Seal member

Claims (5)

The first tubular body made of metal whose end is bulged in the radially outward direction and the second tubular body made of resin having the same inner diameter in the length direction are connected to distribute hot water. When used, it is used for a connection portion formed by inserting the end portion of the first tubular body into the end portion of the second tubular body ,
Comprising a cylindrical main body which is nipped, and a flange portion which can come into contact with the side surface of the second tubular body in the front Symbol outer peripheral surface and the inner circumferential surface of the second tubular body of the first tubular member A sealing member ,
The cylindrical main body portion has an outer peripheral surface and an inner peripheral surface formed flat, and the second tubular body follows the shape of the end of the first tubular body by inserting the first tubular body. A seal member configured such that the inner peripheral surface of the body is deformed to expand in diameter and is made of rubber having a compression set smaller than that of the member configuring the inner peripheral surface of the second tubular body .   The seal member according to claim 1, further comprising a cylindrical rising portion capable of sandwiching the second tubular body from the inside and outside in cooperation with the cylindrical main body portion at an outer peripheral edge of the flange portion. It said outer peripheral surface, the sealing member according to claim 1 or 2 having an inclined portion which is tapered enough away from the flange portion of the tubular body portion.   The sealing member according to any one of claims 1 to 3, wherein a chamfered portion is provided on an entire circumference of an end portion on the side where the flange portion is provided, of the inner peripheral surface of the cylindrical main body portion. A first tubular body made of metal having an end portion bulging outwardly and a second tubular body made of resin having the same inner diameter in the length direction; and the first tubular body A sealing structure of a connecting portion between the first tubular body and the second tubular body when the end of the body is inserted into the end of the second tubular body and hot water is circulated;
A cylindrical main body portion sandwiched between the outer peripheral portion of the first tubular body and the inner peripheral surface of the second tubular body, and a flange portion capable of contacting the side surface of the end portion of the second tubular body. Providing a sealing member having
The cylindrical main body is made of rubber having a compression set smaller than that of the member constituting the inner peripheral surface of the second tubular body, and the outer peripheral surface and the inner peripheral surface of the cylindrical main body are formed flat. ,
The sealing structure of the connection part which the inner peripheral surface of the said 2nd tubular body was made to follow the shape of the edge part of the said 1st tubular body through the said cylindrical main-body part, and was expanded and deformed.

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