JP2017133673A - Pipe joint and plug body used in joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint in which a gasket before use can be surely temporarily fixed by a plug body of a simple structure, the temporarily fixed gasket and a gasket seal face of a pipe end face can be properly protected, in particular, in a union joint, a union nut can be protected by being held substantially between faces of a joint body, an occupied space can be minimized as a whole, and the temporarily fixed gasket is easily detachable.SOLUTION: In a pipe joint including an inner diameter flow channel disposed at one side of a joint body, a connecting portion disposed on an outer periphery of the joint body, and a seal face for a gasket disposed on one side pipe end face of the joint body, a plug body for a pipe end cap is fitted to the inner diameter flow channel, and an annular gasket is temporarily fixed between a flange portion integrated with the plug body and a seal face of a pipe end.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint widely used for, for example, a water meter direct connection union joint, a sanitary union joint, or other pipe joints, and a plug used for the joint.

  This type of pipe joint is a type of screw connection, in which pipe connection and valve connection are connected to the union nut (direct connection nut) and the other pipe connection end (union screw) with a union nut. A gasket is interposed between the pipe end face of the joint and the end face of the pipe connection end. Since the union nut is formed in the shape of a cap nut and is provided with an unstable loose fit at the end of the pipe (union brim), if the union nut is not fixed to the pipe fitting body, Irregular external force acting on the union nut easily rattles and may be damaged because it is provided on the inner periphery. Usually, this is more problematic as the size of the fitting increases and the weight of the union nut increases. It becomes.

  FIG. 6 shows a conventional pipe joint, and shows an example of a state in which the union nut 42 protrudes from between the surfaces of the joint body 40 and the axis is displaced. As shown in the figure, when the union nut 42 is not fixed to the joint body 40, the union nut 42 can move freely as long as it has play inside, especially during transportation where an irregular external force acts. It is easily rattled from the outside and is damaged by hitting an inside or outside object, or an unpleasant metal sound is generated. In particular, since it is formed on the inner peripheral surface of the union nut 42, the threaded portion 41 easily hits the flange portion 43 so that the internally threaded portion 41 is easily damaged.

  In addition, since gaskets are dedicated members attached to pipe joints, when shipping pipe joints as products, it was normal to deliver pipe joints and separate gaskets as a set. .

  Explaining this conventional example, when transporting this kind of union joint with a gasket interposed as a product to a customer, etc., a required gasket is attached to each union joint in advance with a color tie, etc. A gasket and union fitting were included in one set. In addition to this, it is also possible to supply them separately from the union joint or to arrange them separately on the customer side, without being bundled with the main body product and packaged in a separate bag, or with a gasket. However, since the gasket affixed to the union joint is exposed to the outside, it may be deformed / damaged or dropped due to collision or pressure with other members during transportation. Furthermore, the number of man-hours required for tying up the gaskets during product shipment, putting them in a bag, or removing them during use increases, and if the gasket is made of rubber, it may be curled or wrinkled. Further, when the gasket is delivered or procured separately from the union joint, the handling and usability of the product may be impaired because it takes time and cost to manage the gasket.

  Patent document 1 regarding the cap for tubular bodies has been proposed against the background of these problems. In this document, a cap body formed in a bottomed cylindrical shape and fitted into a nut portion and a flange portion provided at an opening end portion thereof are integrally formed, and a female screw of the nut portion is formed on the outer peripheral surface of the cap body. A plurality of engaging protrusions for engaging with the groove, and a flange for releasing the engagement of the engaging protrusion with respect to the female thread groove of the nut portion is formed on the flange portion in the vicinity of the engaging protrusion; and A tube cap is shown in which a notch portion is formed by notching a flange portion at a portion facing the engaging projection, and a notch portion on the gripping body side is notched larger than the other notch portions.

  This tube cap is inserted into the female screw hole of the nut portion through the packing, so that the pair of engaging protrusions are engaged with the female screw groove of the nut portion and attached to the nut portion. The nut portion is temporarily fixed in a state of protruding outward from the flange portion formed at the end portion of the tube body.

  Further, in Patent Document 2, a cylindrical part formed on one surface of a disk part as a fixing part is fitted into a flow path of a pressure-bonding surface of a meter unit, and a knob is formed on a part of the disk part in the radial direction. The protective cap for the crimping surface of the meter unit in which the display portion for protrusion is formed in a tongue-like shape is described, and in the drawing of this document, the crimping surface is a support mechanism for the primary side and the secondary side of the water meter unit An annular gasket or O-ring is fitted and mounted in a mounting groove formed in the concave seat portion, and the cylindrical portion of the cap body is fitted into the flow path. A state is shown in which the disk unit is attached to the unit main body and the disk portion covers the crimping surface.

JP 2014-40855 A JP 2010-275793 A

  However, the tube cap of Patent Document 1 first accommodates the packing inside the nut portion protruding outward from the tube end, and then inserts the tube end cap into the female screw hole of the nut portion. Therefore, it is difficult to visually recognize the packing accommodation state from the outside of the tubular body. In addition, when this pipe cap is used for a union joint, there is a problem of the occupied space of the pipe joint in a state where the pipe cap is mounted. As described above, at least the nut portion protruding from the pipe end is present. With respect to the occupied space and the space occupied by the gripping body protruding from the nut portion, an extra space for accommodating the union joint having the tube cap attached to the nut portion is lost.

  As for the protruding nut part space, the loss per joint may be negligible depending on the type of joint and the housing environment. The loss of the storage space can be a problem. In particular, if there are certain restrictions on the container to be packed, such as when the joints must be stored in a special box that does not have extra space, the number of joints that can be stored is impaired or cannot be stored. There is a problem. Moreover, this point usually becomes more prominent as the nominal diameter / size of the pipe joint increases. Further, the protruding gripping body is also likely to become an obstacle when the joints are laid down and accommodated in the same manner, and it takes time and effort to align the direction of the gripping body that can protrude in an irregular direction. Further, since the tube cap has a structure that can be easily removed by pulling out the gripping body, the tube cap may be accidentally dropped due to the gripping body being caught unexpectedly during transportation of the joint. Moreover, it has a complicated structure having an engaging protrusion, a gripping body, a notch, and the like, and there is a problem in terms of productivity.

  Therefore, the cap that is temporarily fixed to the joint together with the gasket is formed in a simple structure with as few parts as possible that protrude outward and become obstructive during transportation. It is desirable for the pipe joint to have a minimum occupied space without protruding the union nut.

  Patent Document 2 merely relates to a so-called curing cap of a type that is picked up by hand and attached to the crimping surface in order to prevent dust or the like from adhering to the packing on the crimping surface of the water meter in the meter unit before installation. .

  Therefore, the present invention has been developed to solve the above-described problems, and the object of the present invention is to enable reliable temporary fixing of the gasket before use by a stopper having a simple structure, and the temporary fixing is performed. Appropriate protection is provided for the gasket and the gasket seal surface of the pipe end face. Especially in the case of a union joint, the union nut is held almost between the surfaces of the joint body, thereby protecting the union nut and reducing the total occupied space. An object of the present invention is to provide a pipe joint and a plug used for the joint, which can be attached and detached with a gasket that is suppressed and can be easily temporarily fixed.

  In order to achieve the above object, an invention according to claim 1 is directed to an inner diameter flow path provided on one side of a joint body, a connecting portion provided on the outer periphery of the joint body, and a gasket provided on one side pipe end face of the joint body. In the pipe joint having the sealing surface, a plug body for a pipe end cap is fitted in the inner diameter flow path, and an annular ring is formed between the flange portion integrally provided on the plug body and the sealing surface of the pipe end. This is a pipe joint with a gasket temporarily fixed.

  The invention according to claim 2 is a pipe joint in which a plurality of ribs are formed on the plug, and the ribs correspond to the tolerance of the dimensions of the inner diameter flow path.

  The invention according to claim 3 is a pipe joint in which the connecting portion is a union nut, and the union nut is accommodated between the surfaces of the joint body.

  The invention which concerns on Claim 4 is the pipe joint which formed the outer diameter of the collar part larger than the screw diameter of the internal thread part of a union nut at least.

  The invention which concerns on Claim 5 is a pipe joint which made the outer diameter of the collar part smaller than the two-surface width which comprises the external shape of a union nut.

  The invention according to claim 6 is a pipe joint in which the connecting portion is a male screw provided on one outer periphery of the joint body.

  The invention according to claim 7 is a plug used for a pipe joint.

  According to the first aspect of the present invention, the plug body for the pipe end cap is fitted into the inner diameter flow path. Therefore, in the pipe joint having at least the inner diameter flow path and the seal surface of the pipe end, the gasket is attached to the plug body. It can be temporarily fixed between the flange and the sealing surface of the pipe end. Further, since the gasket is temporarily fixed between the flange portion and the seal surface of the pipe end, the gasket can be protected by the flange portion to prevent deformation and the seal surface can be protected. Furthermore, the temporarily fixed gasket can be easily visually recognized from the outside of the pipe joint.

  According to the second aspect of the present invention, when the plug is inserted into the inner diameter channel, the plug is appropriately deformed flexibly by the plug and the rib provided on the outer periphery of the plug, so that the plug is Since it fits securely on the surface, it is possible to cope with the tolerance of the inner diameter flow path of the same nominal diameter caused by the difference in material and casting method, etc., even if the plug body has the same nominal diameter. It can be used for pipe fittings with various internal diameter channels that can occur.

  According to the third aspect of the present invention, in the union joint in which the union nut is accommodated between the surfaces of the joint body, the gasket can be temporarily fixed between the flange of the plug and the seal surface of the pipe end. Further, since the gasket is temporarily fixed between the flange portion and the seal surface of the pipe end, the gasket can be protected by the flange portion to prevent deformation and the seal surface can be protected.

  According to the invention of claim 4, since the outer diameter of the flange portion is formed larger than the screw diameter of the female thread portion of the union nut, in a state where the plug is fitted in the inner diameter flow path, Since the end of the union nut hits the collar, the union nut does not jump out of the collar. Therefore, without directly fixing the union nut, its movement can be limited with sufficient certainty within a slight movable range inward from the flange of the fitted plug body. It can be maintained in a substantially fixed state with respect to the joint body, thereby preventing damage to the union nut during transportation of the pipe joint. Further, since the union nut is housed inward from the flange portion, the union nut does not protrude from the pipe end surface, and the gasket can be temporarily fixed in a state where the space occupied by the union joint is saved.

  On the contrary, the end of the union nut always comes into contact with the fitted flange of the plug body, so pulling the union nut pulls the flange away from the sealing surface and removes the plug body. It is also possible to remove the plug without tampering. In addition, when using a pipe joint, that is, when pulling out a union nut and trying to connect it to the other pipe connection end, the plug is always removed, so the pipe is connected with the plug attached. It is possible to reliably prevent erroneous construction such as

  According to the invention described in claim 5, since at least the outer diameter of the flange portion is smaller than the two-surface width of the end surface of the union nut, the union nut does not protrude from the pipe end surface, and the flange portion is made of the union nut. It does not protrude from the outer diameter. Therefore, the gasket can be temporarily fixed in a state where the space occupied by the union joint is minimized.

  According to the sixth aspect of the present invention, in the pipe joint having a male threaded connection, the gasket can be temporarily fixed between the flange of the plug and the sealing surface of the pipe end. Further, since the gasket is temporarily fixed between the flange portion and the seal surface of the pipe end, the gasket can be protected by the flange portion to prevent deformation and the seal surface can be protected.

  According to the seventh aspect of the present invention, if the plug is fitted to the inner diameter flow path of the pipe joint via the gasket, the gasket is temporarily placed between the flange of the plug and the seal surface of the pipe end. While being able to fix, it protects each sealing surface of a pipe end and a gasket, and also prevents the entrance of foreign matter into the pipe.

It is a disassembled perspective view of the pipe joint for gasket temporary fixation of a 1st embodiment of the present invention. It is the top view which showed the stopper in 1st Embodiment of this invention. It is the sectional view on the AA line in FIG. (A) is sectional drawing of the pipe joint for temporary fixing of the gasket of 1st Embodiment of this invention, (b) is sectional drawing which showed the virtual example which attached the conventional cap body to the coupling main body of this invention. . It is a principal part expanded sectional view of the pipe joint for gasket temporary fixing of 2nd Embodiment of this invention. It is sectional drawing which showed the prior art example in the pipe joint.

  Hereinafter, an embodiment of a pipe joint for temporarily fixing a gasket according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a gasket temporary fixing pipe joint according to a first embodiment of the present invention. Fig.4 (a) is sectional drawing of the pipe joint for gasket temporary fixing of this embodiment.

  As shown in FIG. 1 and FIG. 4 (a), the joint body 1 of this embodiment includes an inner diameter flow path 3 provided on one side and a connection part on the outer periphery of the joint body 1, and this connection part is a union. The nut 2 is accommodated between the surfaces of the joint body 1. Further, a seal surface 4 for the gasket 5 is provided on one side pipe end surface of the joint body 1, and a plug body 6 for a pipe end cap is fitted into the inner diameter flow path 3 of the joint body 1. An annular gasket 5 is temporarily fixed between a flange portion 8 provided integrally with the outer periphery of the tube and a seal surface 4 at the pipe end. The other side of the joint body 1 is not particularly limited and can be arbitrarily configured. In this example, as will be described later, a joint for a resin pipe capable of joining a polyethylene pipe for water supply or the like is provided. Note that the gasket 5 of the present embodiment uses a rubber (NBR) annular gasket 5 having a predetermined thickness that matches the seal surface 4.

  2 is a plan view of the cap body 10, and FIG. 3 is a cross-sectional view taken along line AA of the cap body 10 in FIG. As shown in FIGS. 2 and 3, the cap body 10 of the present invention is provided with a flange 8 integrally on the outer periphery of the plug body 6, and, if configured in this way, the material and manufacturing method of the cap body 10. The size, size, shape, etc. are not particularly limited and can be arbitrarily selected. However, as described later, the cap body 10, particularly the rib 7, requires a certain degree of flexibility. Is preferred. The cap body 10 has a simple structure that does not have a complicated shape. Moreover, since the material of the cap main body 10 of this example is vacuum forming with a translucent polypropylene sheet, the cap main body 10 can be formed thin. In addition, it is also possible to mold with a resin material or a soft material. Further, the plug body 6 has a bottomed shape, but may have a perforated shape. When the perforated shape is formed, the cap body 10 can be easily detached from the joint body 1. Reference numeral 9 denotes an abutting surface with which one side of the gasket 5 abuts.

  As shown in FIGS. 2 and 3, a plurality of ribs 7 are formed on the outer peripheral surface 11 of the plug body 6 of the present embodiment, and the ribs 7 correspond to the tolerance of the inner diameter flow path 3. ing. The rib 7 is preferably formed in a shape that can be shared by different manufacturing methods (for example, sand mold casting, lost wax processing, etc.) of the joint body 1.

  As shown in FIG. 2, the cross-sectional shape of the rib 7 of the present embodiment has a substantially circular arc shape having a hollow portion 7 a. The cross-sectional shape and the thin wall thickness combine to exhibit the elastic flexibility of the rib 7. The length of the rib 7 in the joint axial direction is a length that can be sufficiently fitted into the inner diameter flow path 3 in addition to the thickness of the gasket 5. The shape of the tip 7b of the rib 7 is tapered so that it can be smoothly fitted into the inner diameter flow path 3. The outer diameter dimension S of the rib 7 is set to be substantially the same as or slightly smaller than the inner diameter dimension of the gasket 5 and larger than the inner diameter dimension (including the maximum intersection) of the inner diameter flow path 3. Depending on the purpose, the outer diameter S of the rib 7 may be set slightly larger than the inner diameter of the gasket 5.

  By providing the ribs 7 configured as described above on the outer peripheral surface 11, when the plug body 6 is inserted into the inner diameter flow path 3, the protruding ribs 7 are located at the respective positions of the inner diameter flow path 3. The surface of the inner diameter flow path 3 is captured and brought into close contact with the shape restoring force and the frictional force of the surface while being appropriately flexibly deformed in accordance with the surface state of each. In particular, when the ribs 7 are arranged symmetrically on the cylindrical outer peripheral surface 11, the sum of the adhesion forces of the ribs 7 becomes an appropriate resultant force to absorb the dimensional variation, and the plug body 6 is The fitting to the radial flow path 3 is stabilized. As a result, it is possible to use a uniform cap body 10 of the same size and shape for a product having the same nominal diameter (joint body 1) without causing a mounting failure regardless of the tolerance of its dimensions. The product quality safety / stability or productivity of the main body 10 can be improved.

  Here, the dimension of the inner diameter flow path 3 is generally within a slight range, but the machining tolerance according to the nominal diameter of the joint body 1, the difference in the casting method, the material of the inner diameter flow path 3 There are dimensional tolerances resulting from various factors such as differences or differences in processing methods. For example, when the joint body 1 (inner diameter flow path 3) is a stainless alloy and a copper alloy, The difference in surface characteristics (roughness, etc.) of the inner diameter flow path 3 after processing may be large, and even with the same nominal diameter product, the dimensional tolerance generated between the two tends to increase. On the other hand, the shape of the plug body 6 of the cap body 10 (the outer diameter of the outer peripheral surface 11 or the inner diameter of the flange portion 8) is such that the inner peripheral surface of the inner diameter flow path 3 is fitted to the inner diameter flow path 3. The plug body 6 is inserted into the inner diameter flow path 3 when the tolerance is too large, although it is formed so as to have substantially the same shape (approximately the same diameter as the nominal diameter of the joint body 1). Even if it is simply fitted, it may be impossible to fit, or even if it is fitted, there is a case where the adhesion between the two is weak and it is not suitable for implementation. In this respect, since the rib 7 as described above is provided on the outer peripheral surface 11 of the plug body 6 of the present invention, it can be properly and reliably fitted to the inner diameter flow path 3 without causing such a mounting failure. It is.

  As an example of implementation of the cap body 10 of the present embodiment, when the nominal diameter of the joint is 25, the radius R of the flange portion 8 is set to Φ21 mm, the inner diameter is set to Φ26 mm, and the thickness of the cap body 10 is 0. It is set to 5 mm. The ribs 7 are provided at four locations symmetrically on the outer peripheral surface 11 at intervals of 90 degrees by bending the side surface of the plug body 6 having a substantially cylindrical shape with a bottom. The length of the plug body 6 is 7.5 mm in the axial direction, and the side surface of the plug body 6 swells in a substantially arc shape with a predetermined width toward the outside (inner diameter flow path 3 side) (swelling height 0.45 mm). It is a protrusion. In addition, depending on the nominal diameter, etc., it may be formed at six locations at intervals of 60 degrees, and further, the shape and configuration of the connecting portion with the outer peripheral surface 11 at the lower outer surface of the rib 7 having a substantially circular cross section. (An inclination angle, a curvature, etc.) can also be set suitably. The cap body 10 of the present example can be manufactured with a thin plate for vacuum forming, and the rib 7 is easily deformed and easily accommodates a dimensional tolerance.

  The rib 7 of the present invention is not limited to the structure of the present example shown in FIGS. 2 and 3 as long as the rib 7 is provided so as to have the above function. Accordingly, the shape, arrangement, number, etc. can be arbitrarily selected.

  Further, in FIG. 4 (a), the union nut 2 (connecting portion) has a female screw portion 12 formed of a parallel screw having a screw diameter (inner diameter) of radius r on the inner peripheral surface, and a retaining ring on the inner side. 13 is mounted, and the union nut 2 is provided in a loosely fitted state in a tube-shaped portion 14 having an inner diameter flow path 3 inside provided on the right side of the joint body 1. The tube-shaped portion 14 has a flange portion 15 projecting and formed in an annular shape, and the union nut 2 connects the tube-shaped portion 14 to another tube or the like when the retaining ring 13 is locked to the flange portion 15. It is possible to move freely by a distance of a fastening allowance (not shown).

  As shown in FIG. 4 (a), the plug body 6 is fitted into the inner diameter flow path 3 in a state where the union nut 2 is accommodated within the surface of the joint body 1, and the contact surface of the flange portion 8. A gasket 5 is temporarily fixed between 9 and the seal surface 4. By mounting the cap main body 10 of the present invention on the joint main body 10 in this way, the union nut 2 can be held in the plane, so that the union nut 2 swings as shown in FIG. And the like, and the gasket 5 can be held integrally with the joint body 1.

  On the other hand, FIG.4 (b) showed the state which used the conventional pipe | tube end cap main body 36 which makes the union nut 2 protrude and hold | maintain to the coupling main body 1 of this invention as shown by patent document 1. FIG. It is sectional drawing. The cap body 36 is provided with a plug body 38 having a substantially cylindrical shape with a bottom, a flange portion 37 is provided on the outer periphery of the plug body 38, and a gripping protrusion 39 is provided on the flange portion 37. . As shown in FIG. 4B, the cap main body 36 is formed by pulling the union nut 2 out of the joint main body 1 and engaging the engaging portion provided on the side surface portion of the plug body 38 (not shown) with the female screw portion 12. The nut 2 is temporarily fixed in a protruding state, and the gasket 5 is temporarily fixed between the bottom surface of the plug body 38 and the seal surface 4.

  Therefore, when the cap body in which the gasket is temporarily fixed is used, the union nut 2 protrudes from the temporarily fixed gasket 5 by an amount corresponding to the protrusion width X when FIG. 4 (b) is compared with FIG. 4 (a). Therefore, the space occupied by the joint body 1 is increased. Similarly, since the protruding portion 39 protrudes from the outer shape 16 of the union nut 2 by the length Y, the occupied space of the joint body 1 becomes bulky.

  Further, as shown in FIG. 4A, the radius R of the flange portion 8 according to the present invention is formed to be larger than the radius r of the thread diameter of the female thread portion 12 of the union nut 2, and the union nut 2 is accommodated in the space between the joint body 1. Further, the radius R of the flange portion 8 of the present embodiment is set to be smaller than the length L that is half the width of the two surfaces facing each other at the hexagonal portion constituting the outer shape 16 of the union nut 2. For this reason, as shown in the figure, the radius R of the collar portion 8 of the present embodiment satisfies r <R <L.

  By setting the radius R of the flange portion 8 to r <R, when the union nut 2 moves to the right side of the figure and tries to jump out from between the surfaces, the thread or tip surface of the female thread portion 12 Since 17 hits the buttocks 8, the protrusion is prevented. Therefore, the protrusion width X shown in FIG. 4 (b) is not formed, and the joint body 1 is compared with a conventional pipe end cap in which the union nut 2 protrudes from the joint body 1 and is temporarily fixed. It is possible to reduce the occupied space.

  Further, by setting the radius R of the flange portion 8 to R <L, the flange portion 8 does not protrude outward from the outer shape 16 of the union nut 2. Accordingly, the length Y shown in FIG. 4B is not formed, and the space occupied by the attached cap body 10 is almost completely free from the joint body 1. Therefore, the space occupied by the joint body 1 to which the cap body 10 is attached can be minimized.

  When mounting the cap body 10, for example, the union nut 2 is accommodated within the surface of the joint body 1, and the plug body 6 is placed so that the gasket 5 is sandwiched between the contact surface 9 and the seal surface 4. Fit into the inner diameter flow path 3. At this time, if the gasket 5 is fitted to the plug body 6 in advance (attached to the abutment surface 9), the gasket 5 and the cap body 10 are integrally handled and attached. Easy to do. Then, the cap body 10 is completely mounted so that the entire one surface of the gasket 5 is in close contact with the seal surface 4. On the other hand, when removing the attached cap body 10, for example, the outer diameter edge of the soft collar 8 is pulled out from the inner diameter flow path 3 so as to be peeled off with a finger, and the plug body 6 fitted is taken out. Alternatively, by pulling out the union nut 2, the flange portion 8 may be pushed out by the distal end surface 17, and the plug body 6 fitted thereto may be removed.

  Furthermore, in the case of a conventional cap in which the union nut 2 is pulled out and fixed temporarily as shown in FIG. 4 (b), when the cap is accidentally mounted by an operator when the pipe is connected by removing the cap. In some cases, it is possible to connect the union pipe as it is. However, in the case of the cap body 10 of the present invention, when the union nut 2 is pulled out from the joint body 1, the tip surface 17 hits the flange portion 8 as described above, and the cap is always Since the main body 10 is also configured to be removed, such a problem does not occur.

  Further, in this example, when the cap body 10 is attached, the seal surface 4 of the joint body 1 is protected by the flange portion 8 via the temporarily fixed gasket 5, so that the seal surface 4 provided with the seal member is directly It is not handled in an exposed state to the outside, so that it is not directly damaged by an external object when the joint body 1 is transported. Similarly, since the gasket 5 is also covered with the flange portion 8, the sealing surface of the gasket 5 is not directly exposed to the outside, so that the sealing surface of the gasket 5 collides with other objects. Protected without damage.

  Further, as shown in FIG. 4A, the other side of the joint body 1 of the present example is a connecting portion 18 for inserting a resin pipe (not shown). The resin pipe is inserted into the connecting portion 18 and a ring is inserted. It is a joint for resin pipes that is connected by screwing the cap nut 21 through the body 19. In this example, the ring body 19 is divided into a front ring 19a and a rear ring 19b, and the connecting portion 18 has a wedge-shaped cross section that has an outer tapered shape that is inserted into a pipe end portion of a resin pipe (not shown). An in-core 22 is provided. When the resin tube is inserted into the connecting portion 18 and the cap nut 21 is tightened, the inner peripheral surface of the front ring 19a is pressed against the outer periphery of the resin tube to deform the outer periphery of the resin tube, and the rear ring 19b is reduced in diameter. Thus, the resin tube is effectively prevented from being pulled out by biting into the outer periphery of the resin tube.

  In addition, the connection part on the other side of the joint body 1 is not limited to the above example, and even when a male thread part is provided, the seal surface of the pipe end can be protected. Of course, the present invention is also applied to a form of mounting on one side of the joint body.

  Next, a second embodiment of the present invention will be described. In FIG. 5, the connecting portion is a male screw 32 provided on one outer periphery of the joint body 50. The joint body 50 of the present embodiment includes an inner diameter flow path 30 provided on one side and a seal surface 34 for the gasket 35 provided on the one side pipe end surface, and the plug body 26 is fitted into the inner diameter flow path 30. A state is shown in which an annular gasket 35 is temporarily fixed between a flange 28 (abutment surface 29) integrally provided around the outer periphery of the plug 26 and a seal surface 34 at the pipe end. In addition, the cap body 20 of the present embodiment is provided with a collar portion 28 integrally around the outer periphery of the plug body 26, as in the case of the cap body 10 of the first embodiment. A plurality of ribs 27 are formed, and the ribs 27 correspond to the tolerance of the dimensions of the inner diameter flow path 30.

  In the cap body 20 of this example, the radius R of the flange portion 28 is set to Φ13 mm, the inner diameter is set to Φ13.5 mm, and the thickness of the entire cap body 10 is set to 0.5 mm. The ribs 27 are provided at four positions symmetrically at intervals of 90 degrees on the outer peripheral surface 11 by bending the side surface of the plug body 26 having a substantially cylindrical shape with a bottom. The length of the plug body 26 is 7.5 mm in the axial direction, and the side surface of the plug body 26 swells in a substantially arc shape with a predetermined width toward the outside (inner diameter flow path 30 side) (swelling height 0.2 mm). It is a protrusion. In addition, depending on the nominal diameter, etc., it may be formed at six locations at intervals of 60 degrees, and further, the shape and configuration of the connecting portion with the outer peripheral surface 11 at the lower outer surface of the rib 7 having a substantially circular cross section. (An inclination angle, a curvature, etc.) can also be set suitably.

  As shown in FIG. 5, the cap body of the present invention can be used even when the connecting portion provided on the outer periphery of the joint body is a union nut or a male screw. Thus, since the gasket is temporarily fixed between the flange portion and the seal surface of the pipe end by being fitted in the inner diameter flow path of the joint body, the inner diameter flow path is at least on one side of the pipe end of the joint body. It can be widely used for a pipe joint provided with a connecting portion provided on the outer periphery of the joint main body and a gasket sealing surface on one end pipe end face of the joint main body.

  Although not shown, the outer edge portion of the collar portion of the cap body of the present invention can be folded back so as to cover the gasket. In other words, the flange portion of this example is formed so that the width is adapted to the width of the gasket, and the outer edge is provided with a folded portion along the side surface portion of the plug body at an appropriate height adapted to the thickness of the gasket. It is formed in a substantially L shape. When formed in this way, when the cap body is mounted on the joint body and the gasket is temporarily fixed, the gasket is covered with the flange portion, and the dust resistance can be improved. Further, another flange portion may be formed on the outer periphery of the folded portion. When the outer diameter of the flange portion is larger than the thread diameter of the female thread portion of the union nut, the cap body of this example is connected to the joint. When mounted on the main body, this other flange can prevent the union nut from protruding. Furthermore, in 2nd Embodiment shown in FIG. 5, in addition to making the height of the said folding | returning part adapt to the thickness of a gasket, you may extend | stretch to the length which coat | covers the outer periphery of the external thread 32. FIG.

  Although not shown, the collar part of the cap body of the present invention is integrally provided on the outer periphery of the plug body, and the collar part is integrally provided on the opening edge of the bottomed cylindrical shape. The plug body may have a perforated shape and a cylindrical shape.

  Furthermore, the present invention is not limited to the description of the above embodiment, and various modifications can be made without departing from the spirit of the invention described in the claims of the present invention.

DESCRIPTION OF SYMBOLS 1 Joint body 2 Union nut 3 Inner-diameter flow path 4 Seal surface 5 Gasket 6 Plug body 7 Rib 8 ridge part 9 Contact surface 10 Cap body 11 Outer peripheral surface 12 Female thread part 16 Union nut external shape 17 Tip surface 32 Male thread r Female thread Radius of thread diameter (inner diameter) of thread part R Radius of collar part L Half length of two sides X Projection width Y Length

Claims (7)

  In a pipe joint comprising an inner diameter flow path provided on one side of the joint body, a connection provided on the outer periphery of the joint body, and a gasket sealing surface on one side pipe end face of the joint body, A pipe characterized in that a plug body for a pipe end cap is fitted in the radial flow path, and an annular gasket is temporarily fixed between a flange portion integrally provided on the plug body and the sealing surface of the pipe end. Fittings.   The pipe joint according to claim 1, wherein a plurality of ribs are formed on an outer peripheral surface of the plug body, and the ribs correspond to a tolerance of a dimension of the inner diameter flow path.   The pipe joint according to claim 1 or 2, wherein the connecting portion is a union nut, and the union nut is accommodated between the surfaces of the joint body.   The pipe joint according to any one of claims 1 to 3, wherein an outer diameter of the flange portion is formed at least larger than a screw diameter of a female thread portion of the union nut.   The pipe joint according to any one of claims 1 to 3, wherein an outer diameter of the flange portion is smaller than a width of two surfaces constituting an outer shape of the union nut.   The pipe joint according to claim 1, wherein the connection portion is a male screw provided on one outer periphery of the joint body.   A plug used for the pipe joint according to any one of claims 1 to 6.

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