JP2011190835A - Sealing structure of distributing pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure of a distributing pipe joint capable of preventing a packing disposed between a distributing pipe and a joint from being caused to deteriorate at an early stage by dynamic contact with water flowing in the distributing pipe and thereby extending a service life of the packing. <P>SOLUTION: In the sealing structure of a distributing pipe joint that seals a clearance in the radial direction between the distributing pipe and the joint that connects the distributing pipe by the packing, a protection filter for inhibiting water that infiltrates into the clearance in the radial direction from coming in dynamic contact with the packing is arranged at one side in the axial direction of the packing. The protection filter is formed of a soft material like unwoven fabric. Activated carbon is deposited in the protection filter. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing structure for a water distribution pipe joint for preventing water leakage between the water distribution pipe and a joint connecting the water distribution pipe.

  Conventionally, as a joint structure for connecting tap water distribution pipes, the packing attached to the inner periphery of the joint body is closely fitted to the outer peripheral surface of the water distribution pipe by inserting the water distribution pipe into the joint body, thereby preventing water leakage. A one-touch type water distribution pipe joint that is prevented and prevented from coming off is known (see, for example, Patent Document 1).

JP 2005-133748 A

  FIG. 2 is a view showing a conventional sealing structure in this type of water pipe joint. Water pipes 200 and 200 are connected in series by the joint 100. The joint 100 includes a tubular joint main body 101 into which the water distribution pipe 200 is inserted on the inner periphery, and a distribution (not shown) that prevents the water distribution pipe 200 from being detached from the joint main body 101 by biting into the outer peripheral surface of the water distribution pipe 200. A water pipe holder and a packing 102 which is mounted in a mounting groove 101a formed on the inner peripheral surface of the joint body 101 and is closely fitted to the inner surface of the groove and the outer peripheral surface of the water distribution pipe 200 to prevent water leakage. is doing. In addition, a protrusion 101 b for limiting the insertion length of the water distribution pipe 200 with respect to the joint body 101 is provided on the inner peripheral surface of the joint body 101.

  Here, since the tap water W to be sealed flowing in the distribution pipe 200 contains chlorine for sterilization, the packing 102 is made of water-resistant EPDM (ethylene propylene rubber) or chlorine-resistant. FKM (fluororubber) having hot water resistance is used. In particular, the packing 102 made of FKM is preferably used because it exhibits high durability in a static immersion state with chlorine water in a compressed state. Yes.

  However, in actual use in which tap water flows, the packing 102 may be deteriorated earlier than the evaluation result in the static immersion test in tap water, which has been a problem. This is indicated by an arrow F in the drawing, where a part of the tap water W flowing in the water distribution pipe 200 enters the radial clearance between the water distribution pipe 200 and the joint body 101 from the end of the water distribution pipe 200. The composition in the rubber material is leached into the water from the wetted surface of the packing 102 due to the aggressiveness of chlorine contained in the tap water W, while dynamically contacting the packing 102 while forming such a swirl. It was found that the deterioration of 102 was promoted.

  In addition, it has been found that deterioration due to residual chlorine is not perfect only by measures against materials.

  In view of the above, the present invention can prevent the packing interposed between the water distribution pipe and the joint from deteriorating early due to dynamic contact with the water flowing through the water distribution pipe, and thus the service life of the packing. An object of the present invention is to provide a watertight pipe joint sealing structure capable of extending the length of the water pipe.

  In order to achieve the above object, a sealing structure according to claim 1 of the present invention is a sealing structure for a water distribution pipe joint in which a radial clearance between a water distribution pipe and a joint connecting the water distribution pipes is sealed with a packing. A protective filter for suppressing water entering the radial clearance from dynamically contacting the packing is disposed on one axial side of the protective filter, and the protective filter is made of a flexible material such as a nonwoven fabric. And

  Further, the sealing structure according to claim 2 of the present invention is the sealing structure of a water pipe joint according to claim 1 described above, wherein the protective filter made of a flexible material such as the nonwoven fabric carries activated carbon. And

  In the sealing structure of the present invention having the above-described configuration, water entering the radial clearance between the water pipe and the joint dynamically contacts the packing on one side in the axial direction of the packing interposed between the water pipe and the joint. A protective filter is provided to suppress this. Therefore, even if a part of the water flowing in the water distribution pipe enters the radial clearance between the water distribution pipe and the joint to form a vortex flow, such a flow is blocked by the protective filter and is difficult to reach the packing. The water is in static contact with the packing. Accordingly, it is possible to suppress the progress of deterioration of the packing as compared with the case where water dynamically contacts the packing.

  Since the protective filter is made of a flexible material such as non-woven fabric, it is easily deformed. Therefore, even if this protective filter is provided along with the packing, the insertion resistance when the water pipe is mounted is hardly increased. Therefore, it is possible to ensure good mounting workability.

  Further, when activated carbon is supported on a protective filter made of a flexible material such as a nonwoven fabric, the activated carbon exhibits an action of removing residual chlorine. Therefore, it is possible to remove residual chlorine contained in the water that enters the radial clearance between the water pipe and the joint.

  The present invention has the following effects.

  That is, in the sealing structure of the present invention, the protective filter is arranged on one side in the axial direction of the packing interposed between the water distribution pipe and the joint, so that the water statically contacts the packing. Therefore, even when a substance such as chlorine is contained in the water, the deterioration of the packing due to this can be suppressed, and the service life of the packing can be extended.

  Further, since the protective filter is made of a flexible material such as a nonwoven fabric and is easily deformed, the insertion resistance when the water distribution pipe is mounted hardly increases. Therefore, good mounting workability can be ensured.

  Moreover, residual carbon contained in the water entering the radial clearance between the water pipe and the joint can be removed by supporting the activated carbon on a protective filter made of a flexible material such as a nonwoven fabric.

Sectional drawing which shows the sealing structure based on the Example of this invention Sectional drawing which shows the sealing structure which concerns on a prior art example

The present invention includes the following embodiments.
(1) The present invention relates to a watertight piping sealing structure. This invention is invention about the seal structure of the one-touch-type coupling for the distribution pipes of the tap water containing chlorine. The present invention is also used in the field of piping joints or in the field of housing equipment.
(2) Conventionally, seals such as O-rings are used for the seals of one-touch type joints, and the material used is water-resistant EPDM, chlorine-resistant, hot-water resistant FKM, or the like. Yes. In particular, the FKM packing is preferably used because it exhibits high durability in a static immersion state with chlorine water in a compressed state. However, in an actual joint through which tap water flows, a phenomenon in which the packing deteriorates earlier than the evaluation result in the static immersion described above is a problem. In the conventional seal configuration shown in FIG. 2, a part of tap water enters the clearance between the joint body and the water pipe, and the infused tap water flows and contacts the packing (dynamic Contact), it was found that this facilitates early deterioration. In addition, it has been found that deterioration due to residual chlorine is not perfect only by measures against materials.

(3) Therefore, the sealing structure has the following configuration.
(4) A protective filter is attached to the packing.
(5) A configuration in which the flowing tap water is in static contact with the packing by the filter function of the protective filter.
(6) The present invention is a seal structure in which a protective filter is disposed on the sealing side (tap water side) of the packing for the purpose of filling the clearance. Thereby, the flow of the tap water which contacts packing is reduced (it makes it contact statically), It is characterized by the above-mentioned.
(7) The protective filter is made of a soft material such as non-woven fabric in consideration of the mountability of the joint and the water pipe.
(8) The protective filter has an effect of removing residual chlorine by supporting activated carbon.

(9) According to said structure, by providing a protective filter, the flow of tap water is blocked, and tap water becomes a static contact with respect to packing. Thereby, since deterioration of packing is suppressed, the lifetime of packing can be extended like a static contact state.
(10) Moreover, the effect of removing the residual chlorine in the flowing tap water can be expected due to the effect of the activated carbon supported on the protective filter.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a half cut section of a main part of a sealing structure according to an embodiment of the present invention. As shown in the figure, two water distribution pipes 21 and 21 are connected in series by a joint 11. The joint 11 includes a tubular joint body 12 into which the water distribution pipe 21 is inserted on the inner periphery, and a distribution (not shown) that retains the water distribution pipe 21 with respect to the joint body 12 by biting into the outer peripheral surface of the water distribution pipe 21. A water pipe holder, and a packing 31 that is mounted in an annular mounting groove 13 formed on the inner peripheral surface of the joint body 12 and that is closely fitted to the inner surface of the groove and the outer peripheral surface of the water distribution pipe 21 to prevent water leakage And a protective filter 32. A protrusion 14 for limiting the insertion length of the water distribution pipe 21 with respect to the joint main body 12 is provided on the inner peripheral surface of the joint main body 12, and between the protrusion 14 and the end of the water distribution pipe 21. Since the axial clearance 41 exists, the water (tap water) W flowing through the water distribution pipe 21 enters the radial clearance 42 between the water distribution pipe 21 and the joint 11 via the axial clearance 41, and packing is performed. If 31 is not attached, it will leak outside the joint 11.

  The packing 31 is made of an O-ring, and the tightening allowance for the joint 11 is set by setting the outer diameter dimension in the free state before the mounting to be larger than the inner diameter dimension of the groove bottom of the mounting groove 13. The tightening allowance for the water distribution pipe 21 is set by setting the inner diameter dimension in the previous free state to be smaller than the outer diameter dimension of the water distribution pipe 21.

  The material of the packing 31 is made of water-resistant rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), especially chlorine-resistant and hot-water resistant FKM (fluoro rubber). Yes.

  On the other hand, the protective filter 32 is made of a non-woven fabric and has a strip-like cross section. The protective filter 32 is disposed on one side in the axial direction of the packing 31, that is, on the sealing side (the end side of the water distribution pipe 21). It is mounted in the groove 13. The outer diameter dimension in the free state before mounting of the protective filter 32 is set larger than the inner diameter dimension of the groove bottom portion of the mounting groove 13, so that the protective filter 32 contacts the groove bottom portion of the mounting groove 13, and The inner diameter dimension in the free state is set to be smaller than the outer diameter dimension of the water distribution pipe 21, whereby the protective filter 32 is in contact with the outer peripheral surface of the water distribution pipe 21, whereby the protective filter 32 is on one side in the axial direction of the packing 31. Thus, the radial clearance 42 is completely blocked.

  The protective filter 32 carries an activated carbon component (not shown).

  Assuming that the tap water W flows in the distribution pipe 21 from the left side to the right side in the figure in the sealed structure having the above configuration, a part of the tap water W is axially between the protrusion 14 and the end of the distribution pipe 21. The clearance 41 enters the radial clearance 42 between the water distribution pipe 21 and the joint 11 to form a vortex as shown by an arrow F in the figure.

  However, since such a flow F is interrupted by the protective filter 32 disposed on one side of the packing 31 in the axial direction, the tap water W flowing into the space 33 between the protective filter 32 and the packing 31 has There is almost no flow, so the tap water W is in static contact with the packing 31.

  Accordingly, even if the composition of the packing 31 leaches into the tap water W in the space 33 over time due to the aggressiveness of chlorine in the tap water W, the leached substance saturates in the space 33, so that a new composition is obtained. Leaching is suppressed. For this reason, it is possible to effectively prevent the deterioration of the packing 31 from being promoted by dynamic contact with the tap water W.

  Moreover, in the sealing structure of the said structure, since the protective filter 32 consists of a nonwoven fabric, it is easy to deform | transform, Therefore Even if it installs the protective filter 32 side by side with the packing 31, insertion resistance at the time of water pipe installation may increase. Almost no. Therefore, good mounting workability can be ensured.

  Further, in the sealing structure having the above-described configuration, the activated carbon component is supported on the protective filter 32, so that residual chlorine contained in the water entering the radial clearance 42 between the water distribution pipe 21 and the joint 11 can be removed. Or at least its concentration can be reduced.

  In the above embodiment, one protective filter 32 is provided on one side of the packing 31 in the axial direction. However, a plurality of protective filters 32 may be provided in series in the axial direction. The material of the protective filter 32 may be, for example, a sponge other than a non-woven fabric. In addition to the O-ring, for example, a D-ring or a lip packing may be used as the type of packing.

DESCRIPTION OF SYMBOLS 11 Joint 12 Joint main body 13 Mounting groove 14 Protrusion part 21 Water distribution pipe 31 Packing 32 Protection filter 33 Space 41 Axial clearance 42 Radial clearance

Claims (2)

In the sealing structure of the water pipe joint that seals the radial clearance between the water pipe and the joint connecting the water pipe with packing,
A protective filter for suppressing water entering the radial clearance from dynamically contacting the packing is disposed on one side in the axial direction of the packing, and the protective filter is made of a flexible material such as a nonwoven fabric. Water pipe joint sealing structure characterized by In the sealing structure of the water distribution pipe joint according to claim 1,
A protective structure made of a flexible material such as a nonwoven fabric, wherein activated carbon is supported on the protective filter.

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