JP5735375B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint used for connecting pipe members.

  As a pipe joint for connecting a pipe member such as a gas pipe, a joint main body, a sealing means and a tightening means interposed between the pipe member and the joint main body, a push ring screwed to one end of the joint main body, (For example, refer to Patent Document 1). This pipe joint has, for example, the structure shown in FIG. 9, the joint body 102 is provided with a first tapered surface 106 for acting on the sealing means 104, and the push ring 108 acts on the tightening means 110. The 2nd taper surface 112 for making it provide is provided.

  When connecting the pipe member 114 having the coating layer 118 on the outer peripheral surface of the pipe main body 116, the pipe member 114 is connected as shown in FIG. For example, when it is attempted to connect without removing the covering layer 118, the covering layer 118 is scratched or because of the dimensional instability of the covering layer 118, the sealing means 104 is airtight from above the covering layer 118. It becomes difficult to seal. For this reason, the covering layer 118 at the connection side end of the pipe member 114 is peeled off in a predetermined range in the length direction, and the presser wheel 108 and the tightening are tightened at the connection side end (the end from which the covering layer 118 is peeled off). The means 110 and the sealing means 104 are mounted in this order (in this conventional case, the fireproof packing 120 and the retainer 122 are disposed between the tightening means 110 and the sealing means 104), and then the pipes thus mounted. The connection side end of the member 114 is inserted into the joint main body 102, the push ring 108 is screwed into the joint main body 102, and the push ring 108 is further rotated in the tightening direction to be connected. As a result, the tip of the pusher wheel 108 acts on the sealing means 104 via the fireproof packing 120 and the retainer 122, and the sealing means 104 is pressed against the first tapered surface 106 of the joint body 102, thereby the joint body 102 and the pipe member. 114 (specifically, the tube body 116) is hermetically sealed. When the pusher wheel 108 is rotated in the tightening direction, the second taper surface 112 of the pusher wheel 108 acts on the tightening means 110, and the tightening means 110 is pressed against the second taper surface 112 to be the pipe member 114 (specifically, The tube body 116) is tightened radially inward. Thereafter, a waterproof tape is wound from the connection side end of the joint body 102 to the covering layer 118 of the pipe member 114, and the waterproof tape is wound to prevent water from entering the exposed portion of the pipe body 116.

Japanese Utility Model Publication No. 7-4982

  However, the conventional pipe joint has the following problems to be solved. That is, in order to prevent corrosion of the tube body 116, the waterproof tape is wound so as to cover the peeled portion of the coating layer 118 (that is, the exposed portion of the tube body 116) in the tube member 114, but the workability is poor. The work also requires the skill of the operator. Furthermore, there is a possibility that the wound waterproof tape may be peeled off due to aging, and when it is peeled off, water may enter and the exposed portion of the tube main body 116 may be corroded.

  The objective of this invention is providing the pipe joint which can be connected, without peeling the coating layer of a pipe member.

The pipe joint according to claim 1 of the present invention is a joint body for inserting and connecting a pipe member, sealing means and fastening means interposed between the pipe member and the joint body, and the joint body. A push ring screwed into one end portion on the side where the tube member is inserted, and the joint body is provided with a first taper surface for acting on the sealing means. A pipe joint provided with a second tapered surface for acting on the tightening means,
The tube member has a tube main body that defines a flow path, and a coating layer that covers the outer peripheral surface of the tube main body, and covers the outer peripheral surface of the tube member on the connection side end in an airtight state. When a sleeve member is mounted, the sealing means, the tightening means, and the push ring are mounted on the sleeve member, and when the push ring is screwed into the one end of the joint body and rotated in the tightening direction, the seal means Is pressed against the first taper surface to seal between the joint body and the sleeve member, and the tightening means acts to bite into the second taper surface of the push ring to tighten the sleeve member. It is characterized by.

  In the pipe joint according to claim 2 of the present invention, a male screw part is provided on the outer peripheral part of the connection side end of the pipe body, and a female screw part is provided on the inner peripheral part of the connection side end of the sleeve member. And the male threaded portion of the tube main body and the female threaded portion of the sleeve member are screwed together via a sealing material, whereby the sleeve member covers the outer peripheral surface of the tube member in an airtight state. And

  Furthermore, in the pipe joint according to claim 3 of the present invention, a waterproof seal member is interposed between the sleeve member and the coating layer of the pipe member.

  According to the pipe joint of the first aspect of the present invention, the sleeve member is mounted on the connection side end of the pipe member so as to cover the outer peripheral surface (that is, the coating layer) in an airtight state, and thus mounted. A sealing means, a tightening means and a press ring are mounted on the sleeve member. Then, when the push ring is screwed to one end of the joint body and rotated in the tightening direction, the sealing means is pressed against the first taper surface to seal between the joint body and the sleeve member, and thus the joint body and the sleeve. The space between the members can be hermetically sealed (so-called hermetic sealing). Further, when the press ring is rotated in the tightening direction, the tightening means acts so as to bite into the second taper surface of the press ring to tighten the sleeve member, thereby reliably preventing the pipe member from coming off from the joint body. Can do.

  According to the pipe joint of the second aspect of the present invention, the male screw provided at the connection side end of the pipe main body and the female screw provided at the sleeve member are screwed together via the sealing material. The sleeve member can be attached to the outer peripheral surface of the tube member in an airtight state.

  Furthermore, according to the pipe joint according to claim 3 of the present invention, the waterproof seal member is interposed between the sleeve member and the coating layer of the pipe member, so that the gap between the sleeve member and the coating layer of the pipe member is Can be waterproof sealed.

Sectional drawing which shows a part of one Embodiment of the pipe joint according to this invention. Sectional drawing corresponding to FIG. 1 which shows the pipe joint of FIG. 1 in the state which rotated the push ring in the tightening direction. The fragmentary sectional view which shows a part of pipe member before connecting. The fragmentary sectional view which shows the state which provided the external thread part in the pipe member. The fragmentary sectional view which shows the state which attaches a sleeve member to a pipe member. The fragmentary sectional view which shows the state which attached the sleeve member to the pipe member. The fragmentary sectional view which shows the state which mounted | wore with the press ring etc. to the sleeve member. Sectional drawing which shows a part of other embodiment of the pipe joint according to this invention. Sectional drawing which shows a part of conventional pipe joint.

  Hereinafter, an embodiment of a pipe joint according to the present invention will be described with reference to the accompanying drawings. 1 and 2 (in FIGS. 1 and 2, the structure of the upper part from the center line is shown, the structure of the lower part from the center line is vertically symmetrical with respect to the center line. ), The illustrated pipe joint includes a cylindrical joint body 2, one end of which is provided with a large diameter portion 4 having a large outer diameter, and the other end is provided with a small diameter portion 6 having a small outer diameter. An intermediate diameter portion 8 is provided between the large diameter portion 4 and the small diameter portion 6. A tapered portion 10 is provided on one end portion side of the joint body 2 (specifically, between the medium diameter portion 8 and the large diameter portion 4), and one end (see FIG. 1 and a right tapered end in FIG. 2 is provided with a first tapered surface 12 that expands radially outward. An internal thread portion 13 is provided on the inner peripheral portion of the one end opening of the joint body 2.

  The pipe joint further includes a sealing means 14, a tightening means 16 and a push ring 18. The sealing means 14 is composed of a synthetic rubber annular seal member or the like, and the outer peripheral portion thereof is formed in a tapered shape corresponding to the first tapered surface 12 of the joint body 2. The tightening means 16 includes a rubber band member 19 and a plurality of spherical bodies 20, and the plurality of spherical bodies 20 are held on the band member 18 at a predetermined interval. A nut portion 22 is provided on the outer peripheral portion of one end portion (right end portion in FIGS. 1 and 2) of the pusher wheel 18. Further, a male screw portion 24 that is screwed into the female screw portion 13 of the joint body 2 is provided on the outer peripheral portion of the other end portion (the left end portion in FIGS. 1 and 2) of the push ring 18, and the inner periphery thereof. The surface is provided with a second taper surface 26 that expands radially outward toward the other end. The press ring 18 and the joint body 2 are made of a metal material such as steel, and the surface thereof is subjected to a plating process for preventing corrosion.

  In this embodiment, a retainer 28 and a fireproof packing 30 are disposed between the sealing means 14 and the tightening means 16. The retainer 28 is composed of, for example, an annular plate member made of synthetic resin, and is provided so that the pressing force from the push ring 18 acts on the sealing means 14 uniformly, as will be described later. Moreover, the fireproof packing 30 is provided so as to expand and seal when the temperature becomes high. The fireproof packing 30 can also be configured integrally with the fastening means 16.

  This pipe joint is used to connect the first pipe member 32 and the second pipe member 34. The first pipe member 32 includes a pipe body 38 that defines a gas flow path 36 through which, for example, combustion gas (for example, city gas) flows, and a coating layer 40 that covers the outer peripheral surface of the pipe body 38 (FIG. 3). The tube body 38 is formed of a metal material such as steel, and the covering layer 40 is formed of a synthetic resin material such as vinyl chloride. The first pipe member 32 and the joint body 2 are connected as described later after the sleeve member 42 is attached to the connection side end of the first pipe member 32.

  The second pipe member 34 includes, for example, a pipe main body 46 that defines a gas flow path 44. The pipe main body 46 is formed of a metal material such as steel, and the surface thereof is plated to prevent corrosion. Is given. A male screw portion 48 is provided on the outer peripheral portion of the connection side end portion of the second pipe member 34, and a female screw portion 50 is provided on the inner peripheral portion of the small diameter portion 6 of the joint body 2, and the male screw portion 48 and the female screw portion are provided. The second pipe member 34 and the small-diameter portion 6 of the joint body 2 are connected by screwing 50 together.

  In this embodiment, an annular recess 54 is provided on the inner peripheral surface of one end of the pusher wheel 18, and an O-ring 56 is attached to the annular recess 54, and the O-ring 56 is formed of rubber or the like, for example. An airtight seal is formed between the sleeve member 42 and the sleeve member 42. Instead of the O-ring 56, a selectively permeable seal may be provided. This permselective seal is permeable to gases such as combustion gas, but not liquids and solids such as water, and by using such a selectively permeable seal, it prevents water from entering and seals. It becomes possible to detect a sealing failure caused by the means 14 (that is, gas leakage through the sealing means 14).

  An annular recess 58 is provided at the end of the sleeve member 42 (the end opposite to the connection side end), and an annular waterproof seal member 60 is attached to the annular recess 58. The waterproof seal member 60 is formed of, for example, rubber, and waterproof-seals between the sleeve member 42 and the covering layer 40 of the first tube member 32. As the waterproof seal member 60, the above-described selective transmission seal may be used. In this case, it is possible to detect gas leakage through an airtight seal portion between a male screw portion 62 and a female screw portion 66 described later.

  Next, referring to FIGS. 3 to 7 together with FIGS. 1 and 2, the connection between the one end portion (large diameter portion 4) of the joint body 2 and the first pipe member 32 will be described. As shown in FIG. 3, as the first pipe member 32, a pipe body 38 provided with a coating layer 40 on the outer peripheral surface is used. In this case, as shown in FIG. 4, the connection side of the first pipe member 32 is used. The male screw portion 62 is formed on the coating layer 40 without peeling off the coating layer 40 at the end. As a result, the coating layer 40 is removed from the portion corresponding to the male screw portion 62 when the male screw portion 62 is formed.

  Next, as shown in FIG. 5, the sleeve member 42 is fitted from the connection side (side on which the male screw portion 62 is formed) so as to cover the connection side end of the first pipe member 32. On the inner peripheral surface of the connection side end portion of the sleeve member 42, an annular protrusion 64 that protrudes somewhat inward in the radial direction is provided, and an internal thread portion 66 is provided on the inner periphery of the annular protrusion 64. . When the sleeve member 42 is fitted and the female thread portion 66 is screwed onto the male thread portion 62 of the first tube member 32, the sleeve member 42 is attached to the connection side end of the first tube member 32 as shown in FIG. The sleeve member 42 covers the coating layer 40 at the connection side end of the first pipe member 32. The waterproof seal member 60 is attached to the sleeve member 42. Therefore, when attached in this way, the space between the covering layer 40 of the first pipe member 32 and the sleeve member 42 is waterproof sealed as described above.

  When the sleeve member 42 is mounted, as shown in FIG. 5, a sealing material 68 is applied to the outer peripheral surface of the male screw portion 62 of the first pipe member 32 (and / or the inner peripheral surface of the female screw portion 66 of the sleeve member 42). It is preferable that the male screw part 62 and the female screw part 66 be hermetically sealed by applying the sealing material in this manner.

  Thereafter, as shown in FIG. 7, the pusher wheel 18, the fastening means 16, the fireproof packing 30, the retainer 28, and the sealing means 14 are attached to the sleeve member 42 attached to the first pipe member 32 in this order from the connection side. In this state, the connecting end of the sleeve member 42 is inserted into one end (large diameter portion 4) of the joint body 2. Then, as shown in FIG. 1, the male threaded portion 24 of the presser wheel 18 is screwed into the female threaded portion 13 of the joint body 2, and a tightening tool (not shown) is engaged with the nut portion 22 of the presser wheel 18, for example. To turn. When rotating in the tightening direction, the pusher wheel 18 moves to the joint body 2 side, its end face acts on the sealing means 14 via the fireproof packing 30 and the retainer 28, and the sealing means 14 is the first tapered surface of the joint body 2. 12, and the elastic deformation of the sealing means 14 ensures a hermetic seal between the joint body 2 and the retainer member 42. Further, the second tapered surface 26 acts on the plurality of spherical bodies 20 of the tightening means 16 by the movement of the push wheel 18, and these spherical bodies 20 bite between the second tapered surface 26 and the outer peripheral surface of the sleeve member 42. Thus, the tightening means 16 can tighten the sleeve member 42 radially inward, thereby preventing the first pipe member 32 from coming off from the joint body 2.

  In this pipe joint, as described above, the sleeve member 42 is attached to the first pipe member 32, and the push ring 18, the fastening means 16, the fireproof packing 30, the retainer 28, and the seal means 14 are attached to the sleeve member, and then the push ring. 18 may be screwed into the joint body 2 and rotated in the tightening direction. Such work does not require the skill of the operator, and the work can be made uniform to ensure a certain anticorrosion performance. . In addition, since the connection-side end portion (including the portion where the coating layer 40 is peeled off) of the first pipe member 32 is covered by the sleeve member 42, the first pipe member 32 can be protected and the first pipe member 32 can be protected. The strength of the one pipe member 32 can also be increased.

  Further, in such a connected state, the tube body 38 of the first tube member 32 is not covered and exposed by the coating layer 40 except for the mounting portion (male screw portion 62) with the sleeve member 42. Corrosion of the pipe body 38 can be suppressed. Further, since the O-ring 56 is interposed between the push wheel 18 and the sleeve member 42, the space between them can be hermetically sealed. Further, since the waterproof seal member 60 is interposed between the sleeve member 42 and the covering layer 40 of the first pipe member 32, the intrusion of rainwater or the like into the inside can be suppressed, and the pipe body 38 is corroded. Can be suppressed more effectively. The waterproof seal member 60 may have an O-ring shape, but is not limited to such a shape, and is T-shaped, L-shaped, V-shaped, E-shaped, C An appropriate shape such as a letter shape can be used.

  Next, with reference to FIG. 8, another embodiment of the pipe joint according to the present invention will be described. In the first embodiment described above, the second pipe member 34 is constituted by the plated pipe body 46, and in this connection, the second pipe member 34 and the other end of the joint body 2 are the sleeve members. In this embodiment, the second pipe member is the same as the first pipe member (the pipe body is covered with a coating layer).

  In the joint main body 2A in this other embodiment, the large-diameter portion 4 is provided at one end thereof, and the large-diameter portion 72 is also provided at the other end. Then, the configuration of the large diameter portion 4A at one end of the joint body 2A, the configuration of the first pipe member 32 connected to the large diameter portion 4A, and the related configurations (the push ring 18, the tightening means 16, the fireproof packing 30, the retainer) 28 and the sealing means 14 etc.) have substantially the same configuration as described above, and are connected in the same manner as in the embodiment described above. Further, the second pipe member 34A has the same configuration as the first pipe member 32, and a pipe main body 74 formed of steel or the like, and a coating layer 76 (for example, vinyl chloride or the like) that covers the outer peripheral surface of the pipe main body 74. Formed from). When connecting the second pipe member 34A to the large-diameter portion 72 at the other end of the joint body 2A, as in the case of connecting the first pipe member 32, the same operation as described above using the sleeve member 42 is performed. Is called. Note that members used when connecting the second pipe member 34A and the same members used when connecting the first pipe member 32 are denoted by the same reference numerals for easy understanding. The description is omitted.

  The present invention can be similarly applied to a pipe joint in which a pipe member having a coating layer is connected to both ends of the joint body as described above, and also in such a pipe joint, the same as described above. The effect of this can be achieved.

  As mentioned above, although embodiment of the pipe joint according to this invention was described, this invention is not limited to this embodiment, A various change thru | or correction | amendment are possible without deviating from the scope of this invention.

2,2A, 102 Joint body 12,106 First taper surface 14,104 Sealing means 16,110 Tightening means 18,108 Push ring 26,112 Second taper surface 28,122 Retainer 30,120 Fireproof packing 32,114 First pipe Member 34, 34A Second pipe member 38, 74, 116 Pipe body 40, 76, 118 Coating layer 42 Sleeve member

Claims (3)

A joint main body for inserting and connecting a pipe member; a sealing means and a tightening means interposed between the pipe member and the joint main body; and one end of the joint main body on the side where the pipe member is inserted. A first tapered surface for acting on the sealing means, and a second tapered surface for acting on the tightening means. Pipe fittings,
The tube member has a tube main body that defines a flow path, and a coating layer that covers the outer peripheral surface of the tube main body, and covers the outer peripheral surface of the tube member on the connection side end in an airtight state. When a sleeve member is mounted, the sealing means, the tightening means, and the push ring are mounted on the sleeve member, and when the push ring is screwed into the one end of the joint body and rotated in the tightening direction, the seal means Is pressed against the first taper surface to seal between the joint body and the sleeve member, and the tightening means acts to bite into the second taper surface of the push ring to tighten the sleeve member. Pipe fittings characterized by   A male screw portion is provided on the outer peripheral portion of the connection side end portion of the tube main body, a female screw portion is provided on the inner peripheral portion of the connection side end portion of the sleeve member, and the male screw portion of the pipe main body and the sleeve member 2. The pipe joint according to claim 1, wherein the female thread portion is screwed through a sealing material, whereby the sleeve member covers an outer peripheral surface of the pipe member in an airtight state. The pipe joint according to claim 1 or 2, wherein a waterproof seal member is interposed between the sleeve member and the coating layer of the pipe member.

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