JP5610823B2 - Pipe fittings and seals for pipe fittings - Google Patents

Description

  The present invention relates to a pipe joint that connects pipes to each other, and a sealing material that is provided in the pipe joint, and particularly relates to a pipe joint and a sealing material that are provided at a place where external water pressure acts.

  As disclosed in Patent Document 1 and the like, as a kind of pipe joint for connecting pipes such as ductile cast iron pipes, a receiving port is formed at the end of one pipe connected to each other, and the other A so-called slip-on is formed by forming an insertion port to be inserted into the receiving port at the end of the tube and compressing an annular sealing material between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port. Types of pipe fittings are already known.

  As shown in FIGS. 7 and 8, this type of pipe joint has a sealing material accommodation groove 2 formed on the inner peripheral surface of the receiving port 1, and a sealing material 3 having elasticity such as rubber is formed in the sealing material accommodation groove 2. Arranged. In addition, 5 in FIG. 7 is an insertion slot.

  The sealing material 3 includes a heel portion (a collar portion) 3a that holds the sealing material 3 at a predetermined position in the sealing material accommodation groove 2, a valve portion 3b that seals between the insertion port, and these heel portions 3a. The connecting portion 3c that connects the valve portion 3b is integrated, the heel portion 3a has a substantially rectangular cross section, and the valve portion 3b has a substantially circular shape (or elliptical shape). Correspondingly, a fitting groove 2a for fitting the heel portion 3a of the sealing material 3 into the sealing material accommodation groove 2 to lock the sealing material 3 and a valve for accommodating the valve portion 3b of the sealing material 3 are accommodated. A part receiving groove 2b is formed. In addition, a receiving port inner surface protrusion 4 is formed between the fitting groove 2a and the valve portion housing groove 2b in the receiving port 1 so as to protrude to the inner peripheral side (inner pipe diameter direction). 4, the outer peripheral side portion of the connecting portion 3c in the sealing material 3 is in sliding contact. The valve portion accommodation groove 2b of the seal material accommodation groove 2 in which the valve portion 3b of the seal material 3 is accommodated is provided in the valve portion accommodation groove 2b with a margin even if the valve portion 3b of the seal material 3 is deformed. As shown in the figure, the storage space is relatively large, and the back end portion 2c of the valve portion receiving groove 2b is separated from the back end portion of the valve portion 3b and has a vertical surface shape (on the axis of the tube). The surface shape is orthogonal to the surface.

  In general, a pipe provided with this type of pipe joint is often used as a water supply pipe or a sewer pipe buried in the soil. In this case, since the pressure of water acts on the inside, the sealing material 3 is It is provided for the purpose of preventing water from leaking from the inside of the pipe joint to the outside. And when water pressure (referred to as internal water pressure) acts on the pipe joint from the inside of the pipe, it is deformed so that the valve part 3b is compressed by receiving the internal water pressure mainly from the receiving port back side part in the valve part 3b. The outer peripheral surface of the insertion slot 5 is pressed and sealed.

  By the way, this type of ductile cast iron pipes and pipe joints are used to expand their applications, and pipes and pipe joints are installed in a vertical position as water intake pipes in wells dug vertically in the ground. It has been proposed to be used as In this case, the water level in the pipe may be lowered when, for example, a pump for pumping water is operating while groundwater is stored outside the pipe, such as in the vicinity of the intake section of the well. .

Japanese Utility Model Publication No. 4-133092

  As described above, the external water pressure, which is the water pressure from the outside of the pipe, may be larger than the internal water pressure of the pipe, for example, in the vicinity of the intake portion of the well. However, since the conventional pipe joint has a structure designed to seal the internal water pressure by the sealing material 3, when the external water pressure is applied, the entire sealing material 3 is the sealing material accommodation groove 2 on the back side of the receiving port. Or the valve portion 3b of the sealing material 3 is deformed to a position near the outer periphery of the valve portion receiving groove 2b of the sealing material receiving groove 2, so that the outer peripheral surface of the insertion port by the valve portion 3b is inserted. There is a possibility that the pressing force to the surface is reduced and the sealing material 3 cannot seal well.

  An object of the present invention is to solve the above-mentioned problems, and to provide a pipe joint and a seal material for the pipe joint that can be satisfactorily sealed even when an external water pressure acts.

In order to solve the above-described problem, the pipe joint of the present invention is configured such that an insertion port formed at the end of the other pipe is inserted into a receiving port formed at the end of one of the pipes connected to each other. A pipe joint in which an annular sealing material is compressed and disposed between an inner peripheral surface of a receiving port and an outer peripheral surface of a front insertion port, and is disposed at a place where an external water pressure acts. A sealing material receiving groove in which the sealing material is disposed is formed on the inner peripheral surface of the sealing material, and the surface on the back side of the receiving port in the sealing material receiving groove is inclined so as to have a smaller diameter toward the back side of the receiving port. A taper surface is formed on the back side portion of the seal material that is close to or abuts , and the seal material includes a heel portion that holds the seal material in a predetermined position, and a valve portion that seals between the insertion port. The taper surface of the sealing material receiving groove is in contact with the valve portion of the sealing material when external water pressure is applied to the pipe joint. Characterized in that it is formed in that position. The pipe joint of the present invention is preferably used as a pipe joint for connecting pipes arranged in a vertical posture in a well.

  With this configuration, when external water pressure is applied to the pipe joint, the receiving port back side portion of the sealing material, more specifically, the receiving port back side portion of the sealing material valve portion is received in the sealing material receiving groove of the receiving port. Since it abuts on the tapered surface formed on the surface on the back side of the mouth, the sealing material is larger toward the inner peripheral side by the taper surface as the sealing material is pressed to move to the back side of the receiving port by the external water pressure. Receive reaction force. As a result, when an external water pressure is applied to the pipe joint, the sealing material presses against the outer peripheral surface of the insertion opening with a relatively large force, and good sealing performance is exhibited.

  Further, the present invention is characterized in that an inner peripheral projecting portion that protrudes larger on the inner peripheral side than on the outer peripheral side of the valve portion is formed on the valve portion of the sealing material in a state where no external force is applied. And

  With the above configuration, the valve portion of the seal material is formed with an inner peripheral protruding portion that protrudes more toward the inner peripheral side than the outer peripheral side of the valve portion. The valve portion of the material is pressed with a larger rotational force toward the tapered surface side of the seal material accommodation groove. As a result, the valve portion of the sealing material comes into contact with the outer peripheral surface of the insertion port by a reaction force from the tapered surface of the sealing material accommodation groove, and as a result, the sealing performance is further improved.

  As described above, according to the present invention, the surface of the sealing material receiving groove formed on the inner peripheral surface of the receiving port is inclined so that the diameter toward the inner side of the receiving port becomes narrower toward the inner side of the receiving port. By forming a tapered surface that is close to or in contact with the rear end of the receiving port, the seal material presses the outer peripheral surface of the insertion port with a relatively large force when external water pressure acts on the pipe joint. In addition, good sealing performance is exhibited. In addition, an external water pressure is applied to the pipe joint by forming an inner peripheral protruding portion that protrudes more on the inner peripheral side than on the outer peripheral side of the valve portion in a state where no external force is applied to the valve portion in the sealing material. When this is done, the inner peripheral protrusion of the sealing material presses the outer peripheral surface of the insertion slot with a greater force, and is brought into close contact with each other, thereby providing a better sealing performance.

It is sectional drawing of the pipe joint which concerns on embodiment of this invention. It is sectional drawing of the receiving port of the pipe | tube with which the sealing material of the pipe joint was arrange | positioned. It is a partial notch perspective view of the sealing material. It is sectional drawing which shows the state which started inserting the insertion port in the receptacle of the same pipe joint. It is sectional drawing which shows the state which has arrange | positioned the pipe joint inside the well. It is sectional drawing of the pipe joint. It is sectional drawing of the conventional pipe joint. It is sectional drawing of the receptacle of the pipe | tube with which the sealing material which concerns on the conventional pipe joint was arrange | positioned.

Hereinafter, a pipe joint and a sealing material according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the component of the function similar to the component of the conventional pipe joint mentioned above.
1 and 2, reference numerals 11 and 12 denote ductile cast iron pipes connected to each other through the pipe joint, and a receiving port 1 is formed at the end of one pipe 11 and the other. An insertion port 5 to be inserted into the receiving port 1 is formed at the end of the tube 12, and an annular shape according to the present embodiment is formed between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 5 (FIG. 3). The sealing material 6 of the reference) is compressed and disposed. Further, a sealing material accommodation groove 2 is formed on the inner peripheral surface of the receiving port 1, and a sealing material 6 having elasticity such as rubber is disposed in the sealing material accommodation groove 2.

  As shown in FIG. 2 and the like, the sealing material 6 includes a heel portion (a collar portion) 6a that holds the sealing material 6 in a predetermined position in the sealing material accommodation groove 2, and a valve portion that performs a seal between the insertion port. 6b and the connection part 6c which connects these heel part 6a and valve | bulb part 6b are made into the shape integrated. Here, the heel portion 6a of the sealing material 6 has a substantially rectangular cross section, and the valve portion 6b has a substantially fan-shaped cross section.

  Correspondingly, a fitting groove 2a in which the heel portion 6a of the sealing material 6 is fitted into the sealing material accommodation groove 2 to lock the sealing material 6, and a valve in which the valve portion 6b of the sealing material 6 is accommodated. A part receiving groove 2b is formed. In addition, a receiving port inner surface protrusion 4 is formed between the fitting groove 2a and the valve portion housing groove 2b in the receiving port 1 so as to protrude to the inner peripheral side (inner pipe diameter direction). 4, the outer peripheral side portion of the connecting portion 6c in the sealing material 3 is in sliding contact.

  However, the valve portion accommodation groove 2b of the seal material accommodation groove 2 in which the valve portion 6b of the seal material 6 is accommodated has a surface on the back side of the reception port, and a portion on the back side of the reception port in the valve portion 6b of the seal material 6. It arrange | positions so that it may adjoin or contact | abut. And the taper surface which inclines so that it may become so that a diameter may become so narrow that the receiving port back | inner side may become close | similar to or contact | abuts the receiving port back | inner side part in the valve | bulb part 6b of a sealing material on the surface of the valve part accommodation groove | channel 2b. 2d is formed. That is, the tapered surface 2d is formed by the valve portion of the sealing material 6 when an external water pressure acts on the pipe joint and the sealing material 6 tries to move to the back of the receiving port or the sealing material 6 tries to deform. 6b is formed at a position where it abuts.

  Further, the cross-sectional shape of the sealing material 6 will be described in more detail. As shown in FIG. 2, the sealing material 6 is merely accommodated in the sealing material accommodation groove 2b of the receiving port 1, and the insertion port 5 is the receiving port. 1 is not inserted yet and is not subjected to external force, the valve portion 6b of the sealing material 6 protrudes to the inner peripheral side larger than the connection portion 6c toward the inner side of the receiving port (has a small diameter). The inner peripheral protruding portion 6f is formed on the inner peripheral protruding top portion of the inner peripheral tapered surface 6d. Further, on the outer peripheral side of the valve portion 6b of the sealing material 6, it protrudes slightly to the outer peripheral side from the portion on the back side of the receiving port (becomes a large diameter) from the position where the connecting portion 6c contacts the receiving port inner protrusion 4. It protrudes at the outer peripheral taper surface 6g, and an outer peripheral protrusion 6h is formed at the outer peripheral protrusion top. In addition, a bulging portion 6j that bulges in a substantially arc shape toward the inner side of the receiving port is formed at a position on the back side of the receiving port from the inner peripheral protruding portion 6f and the outer peripheral protruding portion 6h of the valve portion 6b of the sealing material 6. The outer peripheral side portion of the bulging portion 6j is close to the tapered surface 2d of the valve portion housing groove 2b of the sealing material housing groove 2 (or, although not shown, may be in contact with the tapered surface 2d. .) It is arranged. Further, as for the projecting dimension of the sealing member 6 in the radial direction from the connecting part 6c in the valve part 6b, the projecting dimension of the inner peripheral projecting part 6f (specifically, the heel part 6a of the sealing material 6 and the inner peripheral surface of the connecting part 6c). (A projecting dimension inward in the pipe radial direction) A is larger than the projecting dimension of the outer peripheral projecting part 6h (specifically, the projecting dimension outward in the pipe radial direction from the outer peripheral surface of the connecting part 6c of the sealing material 6) B. Is formed.

  The inner peripheral tapered surface 6d of the sealing material 6 is formed from a position close to the heel portion 6a, while the outer peripheral tapered surface 6g of the sealing material 6 is formed from a position away from the heel portion 6a. Further, the inner peripheral protruding portion 6f and the outer peripheral protruding portion 6h are formed at substantially the same position in the tube axis direction, but the outer peripheral protruding portion 6h is slightly more deeper than the inner peripheral protruding portion 6f. Formed on the side. In FIG. 1, 2 f is a back end surface of the receiving port 1, and 2 g is a back side inner peripheral surface of the receiving port 1.

  When the insertion port 5 is started to be inserted into the receiving port 3 to which the sealing material 6 having the above-described configuration is attached, as shown in FIG. 4, first, an inner peripheral tapered surface 6d formed on the valve portion 6b of the sealing material 6 and 6f of inner peripheral protrusions contact | abut to the front-end | tip part of the insertion port 5, or the insertion-portion taper surface 5a formed in the outer peripheral surface of this front-end | tip part. When the insertion port 5 is further inserted into the receiving port 3, the valve portion 6 b of the sealing material 6 is rotated in the C direction by the pressing force by the distal end portion of the insertion port 5, and the valve portion 6 b of the sealing material 6 is Compressed while being deformed to the side and back of the receiving port. Thereby, the valve portion 6b of the sealing material 6 not only contacts the outer peripheral surface of the insertion port 5 and the outer peripheral surface of the valve portion accommodation groove 2b of the receiving port 1, but also contacts the tapered surface 2d of the sealing material accommodation groove 2. At the same time, the valve portion 6b of the seal material 6 receives a reaction force from the tapered surface 2d of the seal material accommodation groove 2, and the reaction force causes the valve portion 6b of the seal material 6 to act on the outer peripheral surface of the insertion port 5 with a relatively large force. Contact.

  And the pipe | tubes 11 and 12 joined by the pipe joint in this way are arrange | positioned in the location where external water pressure acts. For example, as shown in FIG. 5, it arrange | positions in the vertical attitude | position in the vertical hole 20 of the excavated well. In this case, when the groundwater 21 is stored outside the pipes 11 and 12 in the vicinity of the intake section of the well, etc., the water level in the pipes 11 and 12 is operated when a pump for pumping water is operating. As a result, the external water pressure larger than the internal water pressure may act.

  However, in the pipe joint, the seal material 6 is inclined to the surface on the back side of the receiving port in the sealing material accommodation groove 2 formed on the inner peripheral surface of the receiving port 1 so that the diameter becomes smaller toward the back side of the receiving port. A tapered surface 2d is formed on which the valve portion 6b, which is the back side portion of the opening, approaches or abuts. Therefore, as shown schematically in FIG. 6, when the external water pressure P acts on at least the pipe joint, the bulging portion 6j which is the rear portion of the valve portion 6b of the sealing material 6 is The sealing material receiving groove 2b is in contact with a tapered surface 2d formed on the back surface of the receiving port. Then, the seal material 6 is moved to the inner peripheral side (inner pipe diameter direction) by the taper surface 2d as the compression rate is increased by the pressure F so that the seal material 6 moves to the inner side of the receiving port by the external water pressure. Receives a greater reaction force T. As a result, when the external water pressure P is applied to the pipe joint, the sealing material 6 presses the outer peripheral surface of the insertion port 5 with a greater force, and is brought into close contact with the outer peripheral surface of the insertion port 5, thereby providing good sealing performance. (So-called self-sealing performance) is exhibited.

  Further, the valve portion 6b of the sealing material 6 is formed with an inner peripheral protruding portion 6f that protrudes larger on the inner peripheral side than on the outer peripheral side of the valve portion 6b when no external force is applied. When the insertion port 5 is inserted into the receiving port 1, the valve portion 6 b of the sealing material 6 is pressed with a larger rotational force toward the tapered surface 2 d side of the sealing material housing groove 2, and the sealing material housing groove 2 Since the reaction force from the tapered surface 2d increases the force with which the valve portion 6b of the sealing material 6 comes into contact with the outer peripheral surface of the insertion port 5, this further improves the self-sealing performance and improves the reliability.

  In the above-described embodiment, the case where the valve portion 6b of the sealing material 6 has a substantially fan-shaped cross section has been described. However, the present invention is not limited to this. Moreover, in the said embodiment, as shown in FIG. 5, although the case where the pipe | tubes 11 and 12 joined by the pipe joint were arrange | positioned vertically (in the case of what is called vertical piping) was described, it does not restrict to this. Instead, it can be used when the external water pressure acts even when the pipe is installed sideways, and the sealing performance can be maintained well even in this case.

DESCRIPTION OF SYMBOLS 1 Receptacle 2 Sealing material accommodation groove | channel 2a Fitting groove | channel 2b Valve part accommodation groove | channel 4 Receptacle inner surface protrusion 5 Insertion 6 Seal material 6a Heel part (buttock part)
6b Valve part 6c Connection part 6d Inner circumference taper surface 6f Inner circumference projection part 6g Outer circumference taper surface 6h Outer circumference projection part 6j Expansion part 11, 12 Pipe

Claims (4)

The insertion port formed at the end of the other tube is inserted into the reception port formed at the end of one tube connected to each other, and the inner peripheral surface of the reception port and the outer peripheral surface of the front insertion port A pipe joint disposed in a place where an annular sealing material is compressed between them, and where external water pressure acts,
A sealing material receiving groove in which the sealing material is disposed is formed on an inner peripheral surface of the receiving port, and a diameter on the back side of the receiving port in the sealing material receiving groove becomes smaller in diameter toward the inner side of the receiving port. A tapered surface is formed that inclines and the back side portion of the sealing material approaches or abuts ,
The sealing material has a heel portion that holds the sealing material in a predetermined position, and a valve portion that seals between the insertion openings. The tapered surface of the sealing material accommodation groove has an external water pressure applied to the pipe joint. A pipe joint formed at a position where the valve portion of the sealing material abuts when acted . The valve portion of the sealing member, in a state where no external force is applied, to claim 1, characterized in that the inner is formed peripheral protrusion which largely protrudes to the inner peripheral side than the outer peripheral side of the valve portion The described pipe joint. The pipe joint according to claim 1 or 2 , wherein the pipe joint is a pipe joint for connecting pipes arranged in a vertical posture in a well. In the pipe joint disposed at the place where the external water pressure acts, the insertion port formed at the end of the other pipe is inserted into the receiving port formed at the end of the one pipe connected to each other, A sealing material that is compressed and disposed between the inner peripheral surface of the receiving port and the outer peripheral surface of the front insertion port, and between the insertion port and a heel portion that is held at a predetermined position with respect to the receiving port. And a valve portion that performs sealing, and an inner peripheral protruding portion that protrudes more to the inner peripheral side than the outer peripheral side of the valve portion is formed on the valve portion of the sealing material in a state where no external force is applied. The valve portion is formed so as to come into contact with a tapered surface formed on a surface on the back side of the receiving port of the sealing material receiving groove formed in the pipe joint when external water pressure acts on the pipe joint . A sealing material for pipe joints.

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