JP2010025226A - Seal structure, and pipe joint provided with the seal structure, basin, and pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a series of piping work, and to improve sealing performance. <P>SOLUTION: A seal structure includes: a seal body 30 having an outer peripheral surface formed with an annular recess 31 in a peripheral direction, and inserting a pipe body X; and a first pressing body 23 and a second pressing body 23 having pressing surfaces pressing the seal body 30, and arranged at both sides of the seal body 30 so that the seal body 30 is bulged radially inward by being pressed by the pressing surfaces and brought in pressure-contact with the outer peripheral surface of the pipe body X. The radial height of each of the pressing surfaces is set shorter than the depth of the recess 31, and the pressing surfaces press the side end surface of the seal body 30 positioned lateral to the recess 31. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe joint widely used for water supply piping, drainage / sewage piping, and the like, a structure of a connecting portion of a pipe, and an article including the same.

  Conventionally, water supply pipes, drainage / sewage pipes are made using pipe joints, pipes, etc., and the connection part is mainly known as an adhesive type, a rubber ring type, a spherical free type or the like. These are piped by connecting one connecting portion receiving port to the other connecting portion connecting port, for example, a connecting port of a pipe joint, an additional connecting port, or a connecting port of a pipe. In the case of the adhesive type, an adhesive is applied and bonded, and in the case of the rubber ring receiving type, a lubricant is applied and these gaps are inserted into the receiving opening and bonded. Hereinafter, a pipe joint outlet, a mass outlet, or a pipe outlet is collectively referred to as a “tube”. Moreover, it may be piped using the mechanical pipe joint which can be joined without apply | coating an adhesive agent or a lubricant. Examples of this type of pipe joint sealing structure include the following. That is, this conventional one is arranged between a nipple having a tapered surface on one end side inner peripheral surface, a cap nut having a tapered washer having a tapered surface on the inner peripheral surface, and the tapered washer and the nipple. It consists of packing. A groove is formed in the circumferential direction on the outer peripheral surface of the packing. The depth of the groove is set smaller than the height of the tapered surface of the nipple and the taper washer.

When connecting a tubular body to this, the cap nut is screwed into the nipple while the tubular body is inserted into the taper washer. As a result, the packing is pressed by the tapered surfaces of the nipple and the tapered washer, and the diameter is reduced in the radial direction so as to come into pressure contact with the outer peripheral surface of the tubular body. The pipe body is connected to the pipe joint in a state where sealing is achieved by packing.
Japanese Utility Model Publication No. 55-149686

  However, in the above-described conventional one, since the packing is pressed by the entire tapered surfaces of the nipple and the taper washer, the solid portion located inside the groove is also pressed. For this reason, it is necessary to apply a considerable rotational force to the cap nut in order to swell the packing by applying a relatively large pressing force. As a result, there is a problem that the work at the site becomes very troublesome and lacks in workability.

  Further, since the angle of each tapered surface is set to a large value of about 45 °, the width of the gap formed between the inner tapered surface and the end surface of the packing is increased. For this reason, at the time of insertion of a tubular body, the tubular body easily comes into contact with the packing, which is a cause of reducing workability.

  Therefore, the present invention has been made to solve the above-mentioned conventional problems, and its object is to facilitate a series of piping operations and to improve the sealing performance. .

  In order to solve the above-described problems, a seal structure according to the present invention includes a seal body in which an annular concave portion is formed on the outer circumferential surface in the circumferential direction and a tubular body is inserted, and a pressing surface that presses the seal body A first pressing body disposed on both sides of the sealing body so as to bulge radially inward by pressing the sealing body with the pressing surface and press against the outer peripheral surface of the tubular body, and A second pressing body, wherein a radial height of the pressing surface is set to a dimension equal to or smaller than a depth of the concave portion, and the pressing surface is lateral to the concave portion. It is comprised so that the side end surface of the seal body located can be pressed.

  In the above-described seal structure, when the pipe body to be piped is first inserted through the seal body, the seal body is deformed when the seal body is pressed by the first pressing body and the second pressing body. In this case, since the height in the radial direction of the pressing surface of each pressing body is set to be a dimension equal to or smaller than the depth of the concave portion of the sealing body, the side end surface portion located on the side of the concave portion Only will be pressed. Upon receiving such a pressing force, the seal body is deformed so that the concave portion thereof is closed, and bulges inward in the radial direction and is pressed against the outer peripheral surface of the tube body.

The “pressing body” here is intended to be an object that presses a sealing body including first and second pressing bodies, a fixing ring, a joint body, a connecting member, etc., which will be described later, and is it annular? It does not matter whether it has a step.

Further, in the seal structure according to the present invention, the first pressing body and the second pressing body are formed in an annular shape, and a step portion for mounting the seal body is provided on the inner peripheral surface, and the step portion is provided with the step portion. When the seal body is mounted, a gap is formed between the first pressing body and the second pressing body.

  In the above seal structure, the pipe body to be piped is inserted in a state where the seal body is attached to the step portions of the first press body and the second press body. When the sealing body is pressed by the first pressing body and the second pressing body, the sealing body is approached so as to narrow the gap formed between the pressing bodies and receives the pressing force. As a result, the seal body is deformed so that the concave portion thereof is closed, and bulges inward in the radial direction and is pressed against the outer peripheral surface of the tube body.

  According to each of the above-described seal structures, the seal body can easily bulge inward in the radial direction, and good sealability can be obtained. In addition, since the pressing force by the pressing body is small, piping work can be easily performed.

  Further, an inner stepped portion may be formed at an inner position than the stepped portion of the pressing body, and a side end surface of the inner stepped portion may be formed substantially perpendicular to the tube axis direction.

  According to this, the gap formed between the side end surface of the seal body attached to the outer step portion and the side end surface of the inner step portion formed in each pressing body can be narrowed. Therefore, the tube body can be easily inserted into each pressing body without the tube body contacting the pressing body or the seal body.

  Furthermore, the width of the gap formed between the first pressing body and the second pressing body may be set to be equal to or smaller than the width of the concave portion in the tube axis direction.

  In this way, when the sealing body is pressed, the sealing body does not bulge outward from the gap between the pressing bodies. Therefore, the piping work is not hindered by the outward swelling of the sealing body.

  Moreover, you may comprise so that the press surface of each said press body may have a taper part which inclines with respect to the axial direction of this press body.

  According to this, since the pressing surface has a tapered portion that is inclined with respect to the axial direction of each pressing body, the pressing force is appropriately applied so that the concave portion of the sealing body is narrowed. For this reason, the inward bulging of the seal body is further improved, and the pressing force by the press body can be further reduced.

  Furthermore, you may comprise so that the to-be-pressed end surface of the sealing body pressed by the pressing surface of each said pressing body may have a taper part which inclines with respect to the axial direction of each sealing body.

  In this case as well, it is possible to improve the sealing performance due to good swelling of the sealing body and reduce the pressing force by the pressing body.

  Moreover, it is also possible to set the angle of the taper part of each pressing body with respect to the tube axis direction to be the same.

  According to this, since a substantially equal pressing force can act on the sealing body from each pressing body, the sealing body bulges inward substantially perpendicular to the tube axis direction. As a result, it is possible to secure a sufficient contact area between the seal body and the tube body, and further improve the sealing performance.

  Furthermore, a pressing means for pressing the seal body can be provided.

  According to this, the seal body is pressed by the pressing means.

  A joint body having a connection portion; and a fixing ring fixed to the connection portion of the joint body by a rotating operation, wherein the first pressing body and the second pressing body are rotatably fitted in the fixing ring. The pressing means may be constituted by the fixing ring and the joint body.

  In this case, when the fixing ring is rotated, the first and second pressing bodies receive a pressing force by the joint body and the fixing ring which are pressing means. The sealing body is pressed by both of the pressing bodies, bulges inward in the radial direction, and comes into pressure contact with the pipe body.

  Furthermore, a joint body having a connection portion and a fixing ring fixed to the connection portion of the joint body by a rotating operation, the connection portion of the joint body also serves as a first pressing body, the first pressing body Is a part of the joint body, and the second pressing body can be fitted in the fixing ring, and the pressing means can be constituted by the fixing ring and the joint body.

  In this case, when the fixing ring is rotated, the second pressing body receives a pressing force by the fixing ring. The seal body is pressed by the second pressing body and compressed by the connection portion of the second pressing body and the joint body, and the sealing body bulges inward in the radial direction and presses against the tube body. Become.

  A joint body having a connection portion; and a fixing ring fixed to the connection portion of the joint body by a rotating operation, wherein the fixing ring also serves as a second pressing body, and the second pressing body is a fixing ring. The pressing means may be constituted by the fixing ring and the joint body.

  In this case, when the fixing ring is rotated, the sealing body is pressed by the fixing ring, and is compressed by the fixing ring and the first pressing body, and the sealing body bulges inward in the radial direction and is a tubular body. Will be in pressure contact.

  Furthermore, a joint body having a connection portion and a fixing ring fixed to the connection portion of the joint body by a rotating operation, the connection portion of the joint body also serves as a first pressing body, the first pressing body Is a part of the joint main body, and the fixing ring also serves as the second pressing body, and the second pressing body is a part of the fixing ring, and the fixing ring and the joint main body It is also possible to configure the pressing means.

  In this case, when the fixing ring is rotated, the sealing body is pressed by the fixing ring and is compressed by the fixing ring and the connecting portion of the joint body, and the sealing body bulges inward in the radial direction. It will be in pressure contact with the tube.

  Furthermore, the pipe joint, the pipe, or the pipe according to the present invention is provided with the seal structure or the seal structure of the pipe joint in each inflow side connection part or outflow side connection part. These seal structures may be formed integrally with the connecting portion, or may be formed by attaching and manufacturing separately manufactured objects.

  This makes it possible to obtain a pipe joint and a pipe that exhibit the above-described effects.

  According to the present invention, since the sealing body suitably bulges inward in the radial direction, there is an effect that it is possible to reliably and firmly maintain a good sealing property between the tubular bodies.

<First embodiment>
The best mode for carrying out a pipe joint sealing structure according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view including a partial cross section showing a seal structure of a pipe joint according to the present embodiment. Reference numeral 1 in the drawing is a joint body provided with a branch portion 3 on the side surface of the straight pipe portion 2, and a connecting portion 5 having a flange portion 4 is provided on each of the straight pipe portion 2 and the distal end side of the branch portion 3. ing.

  As shown in FIG. 2, the notch 6 is formed with three notches 6 at a predetermined interval. Further, on the side surface of the connecting portion 5, as shown in the figure, three engagement grooves 7 are provided with a predetermined interval. The engaging groove 7 has an insertion portion 8 formed in the tube axis direction, a first straight portion 9 provided in a circumferential direction orthogonal to the insertion portion 8, and a fixing ring 13 described later approaching the joint body 1. In order to achieve this, the first straight portion 9 includes an inclined portion 10 provided continuously with a predetermined angle, and a circumferential second straight portion 11 provided continuously with the inclined portion 10. A curved convex portion 12 is bulged and formed on the second straight portion 11. As shown in FIG. 3, reference numeral 40 denotes a convex portion having a tapered surface 41. The tapered surface 41 is inclined so as to descend toward the insertion side of the insertion portion 8 of the engagement groove 7 (the lower side in FIG. 2 and the right side in FIG. 3).

  Reference numeral 13 denotes a fixing ring attached to the connecting portion 5 of the joint body 1. As shown in FIG. 3, three engagement convex portions 14 that are slidably engaged with the engagement grooves 7 of the joint body 1 are provided on the inner peripheral surface of the one end side with a predetermined interval. . When the fixing ring 13 is attached to the joint main body 1, the insertion convex portion 14 of the fixing ring 13 is inserted over the tapered surface 41 and the convex portion 40 provided in the engaging groove 7 of the joint main body 1. 8 is inserted. Thereby, the integrity of the fixing ring 13 and the connecting portion 5 is maintained. For this reason, if it is manufactured up to this state in advance in a factory or the like, it is possible to simplify the transportation work to the site and the connection work at the site, and the working efficiency is greatly improved. In addition, it is possible to satisfactorily avoid a situation in which each component such as the fixing ring 13 is lost. Note that the fixing ring 13 is not necessarily provided so as not to be detached from the connection portion 5 as described above, and may be configured to be removable.

  Moreover, since the said insertion part 8 is formed in the pipe-axis direction, insertion of the engagement convex part 14 to this insertion part 8 can be performed easily. For this reason, the engagement convex part 14 can be guide | induced appropriately to the 1st linear part 9, and the rotation operation of the fixing ring 13 can be performed favorably. Furthermore, the movement distance of the fixing ring 13 toward the joint body 1 can be ensured by the movement of the engagement convex portion 14 in the insertion portion 8. For this reason, it is not necessary to set the inclined portion 10 at a steep angle or to secure its length more than necessary, and there is an advantage that the joint body 1 can be made compact.

  In addition, when the engaging convex part 14 of the fixing ring 13 moves through the first linear part 9, the inclined part 10 and the second linear part 11 of the engaging groove 7, the fixing ring 13 is as shown in FIG. They are set to rotate 10 °, 40 ° and 10 °, respectively. In this case, if the inclination angle of the inclined portion 10 is set large, the fixing ring 13 can be fixed to the joint body 1 with a small rotational operation. On the other hand, if the inclination angle of the inclined portion 10 is set small, the fixing ring 13 rotates smoothly without difficulty. Therefore, such points are taken into account when determining the inclination angle of the inclined portion 10. In this embodiment, the fixing ring 13 is set so as to approach the joint body 1 by 2.5 mm as the engaging convex portion 14 slides on the inclined portion 10. The inclination angle α with respect to the circumferential direction of the inclined portion 10 is about 4 °.

  As shown in FIG. 5, reference numeral 15 denotes a collar provided at one end of the fixing ring 13. Three notches 16 are formed in the flange 15 with a predetermined interval. These three cutouts 16 are formed on the flange 4 of the joint body 1 when the engagement protrusion 14 of the fixing ring 13 is moved to the end of the second straight portion 11 of the engagement groove 7 of the joint body 1. It is formed at a position that matches the notch 6. Reference numeral 17 is an annular convex portion provided inwardly on the inner peripheral surface of the other end of the fixing ring 13. The outer peripheral surface on the other end side of the fixing ring 13 is formed in a polygonal shape.

  As shown in FIG. 6, reference numeral 18 denotes a stopper that is slidably fitted to the fixing ring 13. As shown in the figure, the annular stopper body 19 has three locking pieces 20 protruding upward with a predetermined interval. The number of the locking pieces 20 can be changed, and the number of the notches 6 and 16 of the joint body 1 and the fixing ring 13 may be changed as appropriate. An engaging portion 21 is provided on the inner peripheral surface of the distal end portion of the locking piece 20. The locking piece 20 is engaged with the notch 6 of the joint body 1 through the notch 16 of the fixing ring 13, and the engaging part 21 is engaged with the flange part 4 to prevent the fixing ring 13 from rotating backward. To do. As shown in FIG. 5B, reference numeral 22 denotes a tape as a mark adhered to the outer peripheral surface of the fixing ring 13. Based on whether or not the mark 22 is exposed to the outside, it can be visually confirmed from the outside whether or not the engaging portion 21 of the stopper 18 is engaged with the flange portion 4 of the joint body 1. .

  Reference numeral 23 denotes an annular first pressing body and a second pressing body that are rotatably fitted in the fixing ring 13. As shown in FIG. 7, an outer step portion 24 and an inner step portion 25 are provided on the inner peripheral surface of one end of each pressing body 23. The outer step portion 24 includes a peripheral surface portion 26, a tapered portion 27 that is inclined with respect to the axial direction of each pressing body, and an inner wall portion 28. The tapered portion 27 and the inner wall portion 28 serve as a pressing surface that directly contacts and presses a seal body 30 described later. In addition, two annular convex portions 29 are provided on the outer peripheral surface of each pressing body 23 at a predetermined interval in the tube axis direction. It should be noted that the outer diameter of the annular convex portion 29 is set slightly smaller than the inner diameter of the fixing ring 13. For this reason, each pressing body 23 is rotatably fitted in the fixing ring 13.

  Reference numeral 30 denotes a rubber seal body fitted to the outer stepped portion 24 so as to be sandwiched between both pressing bodies 23 arranged to face each other as shown in FIG. In this state, a gap 42 is formed between the pressing bodies 23. Reference numeral 31 denotes a concave portion having a substantially V-shaped cross section formed at a substantially central portion of the outer peripheral surface of the seal body 30. Further, a tapered end 46 that is inclined with respect to the axial direction of each sealing body is formed on the pressed end face that is pressed by the pressing surface of the pressing body 23.

  As shown in FIG. 9, the depth A of the recessed portion 31 of the seal body 30 is greater than the height B of the pressing surface that combines the tapered portion 27 and the inner wall portion 28 of each pressing body 23 with A> B is set. In this case, A = B may be set. That is, the pressing surface is configured to press only the end surface portion of the seal body 30 located on the side of the concave portion 31. That is, a position above the bottom of the concave portion 31 is pressed from both sides by the pressing surface.

  Further, the angle Θ with respect to the tube axis direction of the tapered portion 27 of each pressing body 23 is set to 45 °, which is the same angle. In a state in which the seal body 30 is mounted between the pressing bodies 23, the gap width C between the end surfaces of the opposing pressing bodies 23 is smaller than the width D of the concave portion 31 of the seal body 30. In this case, C = D may be set.

  Further, the side end surface of the pressing body 23 is so narrow that a gap width E formed by the side end surface of the seal body 30 and the inner stepped portion 25 which is the side end surface of the pressing body 23 facing the sealing body 30 is as narrow as possible. It is formed substantially perpendicular to the tube axis direction.

  Further, as shown in the figure, the inner diameter F of the sealing body 30 is set slightly larger than the inner diameter G of the pressing body 23, and the inner diameter G of the pressing body 23 is set slightly larger than the outer diameter of the tube to be connected. ing. The pressing body 23 is made of synthetic resin such as Duracon, and the joint body 1 and the fixing ring 13 are made of synthetic resin such as vinyl chloride.

  Reference numeral 32 denotes an O-ring mounted in a groove 33 formed in an annular shape on the end face of the joint body 1 as shown in FIG. When the fixing ring 13 is attached to the joint body 1, the back surface of the first pressing body 23 located on the inner side comes into contact with the end face of the joint body 1 and a seal is achieved by the O-ring 32 (also in FIG. 1). reference). Note that a lubricant is applied to the surface of the O-ring 32.

  The present embodiment is configured as described above. Next, the case where a water supply pipe, a drain pipe, etc. are piped using this pipe joint is demonstrated.

  First, the tube X to be connected to the fixing ring 13 is inserted. In the present embodiment, the inner diameter F of the seal body 30 is set slightly larger than the inner diameter G of the pressing body 23, and the inner diameter G of the pressing body 23 is set larger than the outer diameter of the tube X to be connected, Moreover, since the gap width E formed by the side end surface of the seal body 30 and the inner stepped portion 25 which is the side end surface of the pressing body 23 facing the seal body 30 is set to be as narrow as possible, the tube body X is It can be inserted smoothly.

  Next, as shown in FIG. 10, the fixing ring 13 is pressed toward the joint body 1, and the engaging convex portion 14 of the fixing ring 13 is moved to the end of the insertion portion 8 of the engaging groove 7. At that time, since the outer second pressing body 23 is pressed by the annular convex portion 17 of the fixing ring 13, the pair of pressing bodies 23 and the seal body 30 move together toward the joint body 1 side, The back surface of the first pressing body 23 comes into contact with the end surface of the joint body 1.

  Further, when the fixing ring 13 is rotated, as shown in FIG. 11, the engaging convex portion 14 slides on the second linear portion 11 through the first linear portion 9 and the inclined portion 10 of the engaging groove 7, and the second It moves over the convex part 12 provided in the straight line part 11 to its end. In this case, since the convex part 12 is formed in a curved surface shape, the convex part 12 and the engaging convex part 14 of the fixing ring 13 can be smoothly engaged and disengaged. In addition, since the worker can recognize this engagement / disengagement state by the touch when the fixing ring 13 rotates, the certainty of the work is improved.

  When the engaging convex portion 14 moves on the inclined portion 10 of the engaging groove 7, the seal body 30 is pressed by the annular convex portion 17 of the fixing ring 13 via the outer second pressing body 23. At this time, since the movement of the inner first pressing body 23 is restricted by the joint body 1, the sealing body 30 receives the pressing force from both sides and bends, and expands inward so that its inner diameter F is reduced. It comes out and press-contacts with the outer peripheral surface of the tubular body X. As described above, in the present embodiment, the joint main body 1 and the fixing ring 13 are used as pressing means for the seal body 30.

  In this case, the pressing of the seal body 30 is performed by the pressing surface formed by the tapered portion 27 and the inner wall portion 28 of the outer step portion 24 of the pressing body 23. The height B of the pressing surface combined with the inner wall portion 28 is set to be smaller than the depth A of the concave portion 31 of the seal body 30. Therefore, when the fixing ring 13 is rotated, a pressing force is applied so that the concave portion 31 of the seal body 30 is closed as shown in the figure, and the seal body 30 swells inward. For this reason, the tube body X can be easily connected without applying much rotational force to the fixing ring 13.

  Further, since the angle Θ of each pressing body 23 with respect to the tube axis direction of the tapered portion 27 is 45 °, the pressing force is applied from the respective pressing bodies 23 to the sealing body 30 substantially evenly, thereby causing a bias. It will bulge inward. Therefore, there is an advantage that a sufficient pressure contact area with respect to the tube body X of the seal body 30 can be secured.

  Furthermore, since the gap width C between the end faces of the opposing pressing bodies 23 is smaller than the width D of the concave portion 31 of the sealing body 30 in a state where the sealing bodies 30 are mounted on the pair of pressing bodies 23, The body 30 does not bulge outward from between the pressing bodies 23 and contacts the inner peripheral surface of the fixing ring 13. Therefore, the rotational torque of the fixing ring 13 is not increased.

  In addition, after the seal body 30 is pressed against the tube X, the seal body 30 and the tube X are not integrally rotated by the press contact, and can be rotated between the fixing ring 13 and the pressing body 23. However, the fixing ring 13 is in contact only with the two annular convex portions 29 of each pressing body 23, and the pressing body 23 is made of a slippery duracon, so that it can be easily rotated. Therefore, the joint main body 1 and the tube X rotate relatively. Therefore, it becomes easy to work.

  Thereafter, the locking piece 20 of the stopper 18 is slid to the joint body 1 side, the locking piece 20 is engaged with the notch 6, and the engaging portion 21 is engaged with the flange portion 4 of the joint body 1. . As a result, the mark 22 provided on the fixing ring 13 is exposed, and it can be visually confirmed from the outside that the stopper 18 functions reliably. As a result, a series of connection work of the tube body X is completed, but such a series of connection work has an advantage that it can be performed very easily. Therefore, even in a situation where the work space is limited, it is possible for the operator. A series of connection operations can be efficiently performed without imposing a burden.

  Further, the tube X connected in this way is engaged with the engagement between the projection 12 provided in the engagement groove 7 of the joint body 1 and the engagement projection 14 of the fixing ring 13 and the joint body 1 of the stopper 18. The reverse rotation is prevented by engaging with the notch 6, and the connection state of the tube body X is firmly maintained. Therefore, it is possible to reliably prevent a situation where the fixing ring 13 rotates inadvertently and the circulating fluid leaks or the tube body X is detached from the joint body 1.

  On the other hand, when removing the pipe body X from the pipe joint, the stopper 18 is slid to the pipe body X side to release the engagement state between the engagement portion 21 and the flange portion 4 of the joint body 1. The locking piece 20 of the stopper 18 is detached from the notch 6 of the flange 4. It can be confirmed from the outside that the mark 22 is concealed by the stopper body 19 of the stopper 18.

  Next, when a slightly strong rotational force is applied to rotate the fixing ring 13 in the opposite direction, the convex portion 12 provided in the engagement groove 7 of the joint body 1 is formed in a curved shape. The engagement state between the projection 12 and the engagement projection 14 of the fixing ring 13 is released. Further, the fixing ring 13 is rotated to a position (original position) where the engaging convex portion 14 is opposed to the convex portion 40 provided in the insertion portion 8 of the engaging groove 7.

  In addition, since the engagement convex part 14 moves the inclined part 10 of the engagement groove 7 in the reverse direction, the pressing force from the outer pressing body 23 is removed, so that the inner diameter F of the sealing body 30 increases. The diameter returns to the original state. Thereby, since the press-contact state with the pipe body X is cancelled | released, the pipe body X can be easily removed from a coupling.

  Further, in this state, since the fixing ring 13 and the pressing body 23 are rotatably fitted, the fixing ring 13 and the joint body 1 are connected to the pressing body 23, the seal body 30 and the tube body X. It is possible to rotate.

  Therefore, when the installation location of the water supply / drainage device is changed due to a layout change after the construction of the pipe, for example, when the arrangement of the pipe X to be piped to the branch portion 3 of the joint body 1 is changed, FIG. As shown above, after the branch part 3 of the joint body 1 is appropriately rotated according to the position of the pipe body X to be newly connected, the new pipe body X is connected to the branch part 3 as described above. Just do it. In this way, it is possible to respond quickly and flexibly to changes in the layout after the construction of the piping. In addition, when the arrangement | positioning of the pipe body X which should be piping to the straight pipe part 2 of the coupling main body 1 changes, it can respond similarly.

  Moreover, since the pipe joint according to the present embodiment has a very simple structure as a whole, it has an advantage that it can be manufactured easily and inexpensively.

  In the above-described embodiment, the first and second pressing bodies 23 are formed by a pair of annularly formed pressing bodies 23. For example, as described below, the first pressing body 23 is connected to a joint. The main body 1 can also be configured. Hereinafter, the same reference numerals are given to portions common to the above embodiment, and the description thereof is omitted. That is, as shown in FIG. 13, the joint main body 1 includes a connection portion 47 whose one end is connected to the fixing ring 13 and a main body side connection portion 48 connected to the other end of the connection portion 47. . Further, the inner peripheral surface of one end portion of the connecting portion 47 has the same configuration as that of the pressing body 23, and the seal body 30 can be attached thereto. The seal between the connection portion 47 and the main body side connection portion 48 is achieved by an O-ring 49 that is externally fitted to the outer peripheral surface of the main body side connection portion 48. The seal body 30 is pressed by the fixing ring 13 as the pressing means and the joint body. Also in this case, the same sealing effect as in the above embodiment can be obtained.

  On the contrary, the second pressing body 23 can be constituted by the fixing ring 13. Furthermore, the first pressing body 23 can be configured by the joint body 1 and the second pressing body 23 can be configured by the fixing ring 13. In any case, the same effect as in the above embodiment can be obtained.

  Furthermore, the pressing of the sealing body 30 by each pressing body 23 is not necessarily performed on the entire circumference, and may be performed in part. Therefore, each pressing body 23 is not annular, and may be composed of a plurality of members, for example, a half shape or a triple shape.

  The seal body 30, the tube X, the fixing ring 13, and the connecting portion 47 are integrally rotated after the seal body 30 is pressed against the tube X and the stopper 18 is locked to the joint body 1. Instead, it can rotate between the connecting portion 47 and the main body side connecting portion 48.

  Moreover, in this embodiment, although the coupling main body 1 and the fixing ring 13 are used as the pressing means for the seal body 30, the specific configuration of the pressing means is not limited to this. Therefore, the joint body 1 and the fixing ring 13 are not necessarily essential requirements of the present invention.

  Furthermore, in the said embodiment, although the pressing surface of the press body 23 was comprised by the taper part 27 and the inner wall part 28, either one of the taper part 27 or the inner wall part 28 is abbreviate | omitted, and the taper part 27 or the inner wall part 28 is omitted. You may comprise a press surface only by.

  Moreover, in the said embodiment, although the taper part 46 is provided in the outer peripheral part end surface of the sealing body 30 used as a to-be-pressed end surface, this taper part 46 does not necessarily need to be provided. However, the provision of the tapered portions 27 and 46 in the pressing body 23 and the sealing body 30 has an advantage that the swelling of the sealing body 30 during pressing is further improved.

  Further, as in the above-described embodiment, the angle Θ with respect to the tube axis direction of the tapered portion 27 of each pressing body 23 does not need to be the same angle of 45 °. The specific angle is not questioned and does not need to be the same angle.

  Furthermore, in the present embodiment, the gap width C between the end faces of the opposing pressing body 23 is set to be equal to or smaller than the width D of the concave portion 31 of the sealing body 30, but conversely, C> D. It does not matter if set to

  Further, in the above-described embodiment, the pressing body is such that the gap width E formed by the side end surface of the seal body 30 and the inner stepped portion 25 serving as the side end surface of the pressing body 23 facing the sealing body 30 is as narrow as possible. The side end surfaces of 23 are formed substantially perpendicular to the tube axis direction. However, the present invention is by no means limited to this, and the specific size of the gap width E, the shape of the side end face of the pressing body 23, and the like can be appropriately changed.

  Furthermore, the cross-sectional shape of the concave portion 31 provided on the outer peripheral surface of the seal body 30 is not limited to the V shape. For example, it may be formed in a substantially U-shaped cross section.

<Second embodiment>
The seal structure according to the present invention can also be applied as follows. In the following, the above-described seal structure Y will be described with reference to FIGS. 14 and 15. In addition, about the part which is common in 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Z shown in FIG. 14 includes a main body 52 formed with an inflow portion 50 and an outflow portion 51 corresponding to the straight pipe portion 2 and the branch portion 3 of the joint body 1, and the inflow portion 50 and the outflow portion 51. The seal structure Y is provided. An inspection port 53 is formed in the upper part of the main body 52.

  Further, Z shown in FIG. 15 is one in which an inflow portion 50 and an outflow portion 51 are formed so as to face the side portion of the main body 52. The inflow portion 50 and the outflow portion 51 are each provided with a seal structure Y. Is provided. An inspection port 53 is formed in the upper part of the main body 52.

  As described above, even when the seal structure Y is further applied, the same effect as described above can be obtained.

In this case, the specific configuration such as the shape is not limited as in the above embodiment.
<Third embodiment>

The seal structure according to the present invention can also be applied to a pipe. As shown in FIG. 16, since the seal structure Y is common to the above embodiment, the description thereof is omitted. In the embodiment shown in FIG. 16, the seal structure Y is manufactured separately and integrated with the end of the pipe body 60 by bonding. The embodiment shown in FIG. It is inserted and bonded to the end of the pipe body 60.

  As described above, the present invention is useful as a seal structure that is pipe-connected to a pipe body.

It is sectional drawing which shows one Embodiment of a sealing structure with a tubular body. It is a front view which shows a part of joint body. It is sectional drawing which shows the state which attached the fixing ring to the coupling main body. It is a front view which shows the engaging groove of a coupling main body. (A) is a top view of a fixing ring, (b) is the sectional drawing. (A) is a top view of a stopper, (b) is the front view. (A) is a top view of a press body, (b) is the sectional drawing. It is sectional drawing which shows the state which attached the sealing body to the press body. It is sectional drawing which shows the state which mounted | wore the press body with the seal body. It is sectional drawing which shows the state which inserted the pipe body in the coupling. It is sectional drawing which shows the state which inserted and fixed the pipe body to the coupling. It is a front view which shows the use condition of a coupling. It is sectional drawing which shows other embodiment. It is sectional drawing which shows one Embodiment. It is sectional drawing which shows another one Embodiment. It is sectional drawing which shows one Embodiment of a pipe. It is sectional drawing which shows other one Embodiment of a pipe.

Explanation of symbols

1 Joint body 5 Connection 13 Fixing ring (second pressing body)
23 First pressing body, second pressing body 24 Outer step portion 25 Inner step portion 27 Tapered portion 30 Sealing body 31 Concave portion 42 Gap 46 Tapered portion 47 Connection portion (first pressing body)
52 Main body 60 Pipe body X Pipe body Y Seal structure

Claims (15)

An annular concave portion is formed in the circumferential direction on the outer peripheral surface, and a seal body through which the tubular body is inserted;
There is a pressing surface for pressing the seal body, and by pressing the seal body with the pressing surface, it bulges inward in the radial direction and is brought into pressure contact with the outer peripheral surface of the tube body, respectively. A first pressing body and a second pressing body, and a seal structure comprising:
The height of the pressing surface in the radial direction is set to a dimension equal to or smaller than the depth of the concave portion, and the pressing surface is configured to press the side end surface of the sealing body located on the side of the concave portion. The seal structure characterized by comprising.   The first pressing body and the second pressing body are formed in an annular shape, and a step portion for mounting the seal body is provided on the inner peripheral surface, and when the seal body is mounted on the step portion, The seal structure according to claim 1, wherein a gap is formed between the first pressing body and the second pressing body.   The seal structure according to claim 2, wherein an inner step portion is formed at an inner position than the step portion of the pressing body, and a side end surface of the inner step portion is formed substantially perpendicular to the tube axis direction. . The seal structure according to claim 2 or 3, wherein a gap width formed between the first pressing body and the second pressing body is set to be equal to or less than a width of the concave portion in the tube axis direction. The seal structure according to any one of claims 1 to 4, wherein the pressing surface of each pressing body has a tapered portion that is inclined with respect to the axial direction of the pressing body.   The seal structure according to claim 5, wherein a pressed end surface of the seal body that is pressed by the press surface of each of the press bodies has a tapered portion that is inclined with respect to the axial direction of the seal body.   The seal structure according to claim 5 or 6, wherein the angle of the tapered portion of each pressing body with respect to the tube axis direction is set to be the same.   The seal structure according to any one of claims 1 to 7, further comprising pressing means for pressing the seal body. A joint body having a connecting portion;
A fixing ring fixed to the connection portion of the joint body by a rotating operation,
The seal structure according to claim 8, wherein the first pressing body and the second pressing body are rotatably fitted in the fixing ring, and the pressing means is constituted by the fixing ring and the joint body. A joint body having a connecting portion;
A fixing ring fixed to the connection portion of the joint body by a rotating operation,
The connecting portion of the joint body also serves as a first pressing body, the first pressing body is a part of the joint body, and the second pressing body is fitted in a fixing ring, The seal structure according to claim 8, wherein the pressing means is constituted by a fixing ring and the joint body. A joint body having a connecting portion;
A fixing ring fixed to the connection portion of the joint body by a rotating operation,
The said fixing ring serves as a 2nd press body, This 2nd press body is a part of fixing ring, The said pressing means is comprised by this fixing ring and the said coupling main body. Seal structure. A joint body having a connecting portion;
A fixing ring fixed to the connection portion of the joint body by a rotating operation,
The connecting portion of the joint body also serves as a first pressing body, the first pressing body serves as a part of the joint body, and the fixing ring also serves as a second pressing body. The seal structure according to claim 8, wherein the body is a part of a fixing ring, and the pressing means is constituted by the fixing ring and the joint body.   A pipe joint provided with the seal structure according to any one of claims 1 to 12. A seal structure according to any one of claims 1 to 12 is provided. A pipe comprising the seal structure according to any one of claims 1 to 12.

Images