JP3156347U - Flexible joint with water hammer preventer - Google Patents

Abstract

Provided is a flexible joint with a water hammer preventer that enhances workability of pipe connection and prevents water leakage while providing a water hammer preventive function. A cap nut 4 is rotatably fitted to an end portion of a flexible tube 2 having flexibility, and the cap nut 4 is prevented from coming off by a locking ring 5 fitted to the flexible tube 2. In the flexible joint in which the radial surface of the inserted annular packing 7 is brought into contact with the flange 6 of the flexible pipe 2 and the cap nut 4 is screwed into the pipe, the difference protruding in the length direction at the end of the flexible pipe 2 The insertion tube portion 8 is provided, the inner peripheral surface of the packing 7 is crimped to the insertion tube portion 8, and the water hammer preventer 10 is attached to one end portion of the flexible tube 2 via the three-way branch tube 9. [Selection] Figure 2

Description

  The present invention relates to a flexible joint having a function of alleviating an impact caused by tap water pulsation accompanying water stoppage.

  Currently, single lever type hot and cold water mixing taps are generally used in washstands and sinks. In this mixer tap, if the water stops suddenly from flowing water, the hot water flowing through the pipe loses its place, creating an instantaneous pressure, which causes a water hammer phenomenon that is transmitted to the pipe as an impact sound or vibration. It was.

  As a countermeasure, for example, in Patent Document 1 below, as shown in FIG. 7, a water hammer preventer 53 enclosing a buffer material is attached to the end of an eccentric tube 52 to which a mixing plug 51 is connected. Means for mitigating are described.

  By the way, the mixing plug 51 is often connected to the water stop cock 54 through the flexible joint 21 that extends from the eccentric tube 52 to the lower side of the washstand or sink.

  As shown in FIGS. 8 and 9, the flexible joint 21 covers the outer periphery of the flexible tube 22 with a cladding tube 23, and a cap nut 24 is rotatably fitted to both ends of the flexible tube 22. The locking ring 25 fitted on the outer periphery of the flexible tube 22 is prevented from coming off, and the locking ring 25 is held by the flange 26 of the flexible tube 22.

  When using such a flexible joint 21 to connect the eccentric tube 52 and the water stop plug 54 on the mixing plug 51 side, the radial surface of the annular packing 27 inserted into the cap nut 24 is set to the flange 26. The cap nut 24 is rotated and screwed into the outer periphery of the end portions of the eccentric tube 52 and the water stop cock 54 and tightened.

Japanese Patent No. 2811566

  However, as described above, when connecting the pipe by the flexible joint 21 and attaching the water hammer preventer 53 to the eccentric pipe 52 at the time of construction, in addition to the work on site, the packing 27 falls off. The location may be unknown.

  Further, when a force is applied such that the flexible joint 21 and the axis line of the eccentric pipe 52 connected thereto are bent in a broken line shape, the crimping of the radial surface of the packing 27 becomes uneven and the sealing performance is impaired. There is also a problem that water leakage is likely to occur.

  In addition, as the cap nut 24 is screwed into the pipe, the packing 27 tries to rotate together with the cap nut 24, and accordingly, the packing 27 is twisted, and the packing 27 may be damaged to cause water leakage.

  Then, this invention makes it a subject to prevent a water leak while improving workability | operativity of piping connection, providing the water hammer prevention function.

  In order to solve the above-described problems, a flexible joint according to the present invention is configured such that a cap nut is rotatably fitted to an end portion of a flexible tube having flexibility, and is prevented from coming off by a locking ring in which the cap nut is fitted to the flexible tube. In the flexible joint in which the radial surface of the annular packing inserted into the cap nut is brought into contact with the flange of the flexible pipe and the cap nut is screwed into the pipe, the difference protruding in the length direction at the end of the flexible pipe An insertion cylinder part was provided, the inner peripheral surface of the packing was crimped to the insertion cylinder part, and a water hammer was attached to one end of the flexible pipe via a three-way branch pipe.

  In addition, a stop cock having a water hammer preventer as a handle is attached to one end of the flexible pipe without using a three-way branch pipe.

  When the pipes are connected via this flexible joint, the flexible pipe and the water hammer preventer are integrated in advance, so it can be easily constructed, and the inner peripheral surface of the packing is crimped to the plug-in cylinder. Therefore, the packing does not fall off during construction, and the location is not unknown.

  Moreover, since the insertion cylinder part of a flexible pipe is inserted in piping, the axis of piping and a flexible pipe does not bend in a broken line shape.

  For this reason, the uniformity of the crimping on the radial surface of the packing is maintained, and the crimping of the inner circumferential surface of the packing to the insertion tube part prevents the twisting of the packing accompanying the tightening of the cap nut. Water leakage at the connecting portion is reliably prevented.

The perspective view which shows the use condition of the flexible joint with a water hammer preventer which concerns on 1st Embodiment. Longitudinal section of the flexible joint Expanded sectional view of the connection part Partially enlarged sectional view showing a connection state in which the flexible tube is bent The perspective view which shows the use condition of the flexible joint with a water hammer preventer which concerns on 2nd Embodiment. Longitudinal section of the flexible joint The perspective view which shows the use condition of the conventional flexible joint Longitudinal section of the flexible joint Expanded sectional view of the connection part

  First, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the flexible joint 1 is similar to the conventional one, for example, when connecting an eccentric tube 52 to which a mixing plug 51 is connected and a stop cock 54 below a sink or a washstand, etc. It is used for

  As shown in FIGS. 2 and 3, in the flexible joint 1, the outer periphery of a bellows-like flexible tube 2 made of metal such as stainless steel is covered with a bellows-like cladding tube 3 made of rubber or the like. The tube 3 can be freely curved.

  A cap nut 4 is rotatably fitted at both ends of the flexible tube 2, and the cap nut 4 is prevented from being detached by a locking ring 5 made of a metal such as stainless steel fitted to the flexible tube 2. The retaining ring 5 is held by the flange 6 of the flexible tube 2.

  An annular plate-shaped rubber packing 7 is inserted into the cap nut 4, and one diameter surface thereof is in contact with the flange 6. At both ends of the flexible tube 2, an insertion tube portion 8 protruding from the flange 6 in the length direction is provided, and the inner peripheral surface of the packing 7 is pressure-bonded to the insertion tube portion 8.

  One flexible connection portion of the three-way branch tube 9 is connected to the lower end portion of the flexible tube 2, and a water hammer preventer 10 is attached to the branch connection portion of the three-way branch tube 9.

  When the construction is performed at the site, an eccentric tube 52 on the mixing plug side is connected to the upper end portion of the flexible tube 2, and a water stop plug 54 is connected to the other direct connection portion of the three-way branch tube 9.

  Here, when connecting the eccentric tube 52 and the three-way branch tube 9 to the flexible tube 2, the insertion tube portion 8 on the upper end side is connected to the eccentric tube 52, and the insertion tube portion 8 on the lower end side is connected to the three-way branch tube 9. Insert and rotate the cap nut 4 to screw into the outer ends of the eccentric tube 52 and the three-way branch tube 9.

  When the eccentric pipe 52 and the water stop cock 54 are connected via the flexible joint 1, the flexible pipe 2 and the water hammer preventer 10 are integrated in advance, so that the construction can be easily performed and the packing is performed. Since the inner peripheral surface of 7 is pressure-bonded to the plug-in cylinder portion 8, the packing 7 does not fall off during construction and the location is unclear.

  Further, since the insertion tube portion 8 of the flexible tube 2 is inserted into the piping such as the eccentric tube 52 and the three-way branch tube 9, even if the flexible tube 2 is curved as shown in FIG. The axis of the flexible tube 2 is not bent into a broken line.

  For this reason, the uniformity of the crimping on the radial surface of the packing 7 is maintained, and the twisting of the packing 7 accompanying the tightening of the cap nut 4 is also caused by the crimping of the inner peripheral surface of the packing 7 to the insertion tube portion 8 described above. This prevents water leakage at the connection with the pipe.

  Note that the cladding tube 3 may be omitted when heat insulation or dew proofing is not required, such as when applied to a water-only faucet rather than a hot and cold water faucet. In addition, the water stop cock 54 may not be supplied from a vertical wall surface, but may be supplied from a pipe rising from the floor.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In this flexible joint 1, as in the first embodiment, a water stopcock 11 having a water hammer preventer 10 as a handle is attached to the lower end portion of the flexible pipe 2 without using a three-way branch pipe. A pipe 55 rising from the floor is connected to the lower end of the stopper 11.

  The water hammer preventer 10 includes a diaphragm 10a and a buffer material 10b, and exemplifies a water hammer that mitigates water hammer acting through the communication passage 11a in the valve stem of the water stop cock 11, but other types. May be used.

  When such a flexible joint 1 is used, since it is not necessary to connect the single stop cock 55 and the water hammer preventer 10 on site as in the first embodiment, the workability can be further improved. it can.

  In each of the above embodiments, the eccentric plug 52 on the mixing plug side is connected to the upper end portion of the flexible joint 1, and the water stop cock 54 or the pipe 55 rising from the floor is connected to the lower end portion of the flexible joint 1. Although shown respectively, piping connected to the flexible joint 1 is not limited to these.

DESCRIPTION OF SYMBOLS 1 Flexible joint 2 Flexible pipe 3 Coated pipe 4 Cap nut 5 Locking ring 6 Flange 7 Packing 8 Insertion cylinder part 9 Three-way branch pipe 10 Water hammer preventer 11 Water stop valve with water hammer preventer

Claims (2)

  A cap nut (4) is rotatably fitted to the end of the flexible tube (2) having flexibility, and the cap nut (4) is retained by a locking ring (5) fitted to the flexible tube (2). In the flexible joint in which the diameter surface of the annular packing (7) inserted into the cap nut (4) is brought into contact with the flange (6) of the flexible pipe (2) and the cap nut (4) is screwed into the pipe. At the end of the flexible tube (2), an insertion tube portion (8) protruding in the length direction is provided, and the inner peripheral surface of the packing (7) is crimped to the insertion tube portion (8). A flexible joint, wherein a water hammer preventer (10) is attached to one end of 2) via a three-way branch pipe (9).   A cap nut (4) is rotatably fitted to the end of the flexible tube (2) having flexibility, and the cap nut (4) is retained by a locking ring (5) fitted to the flexible tube (2). In the flexible joint in which the diameter surface of the annular packing (7) inserted into the cap nut (4) is brought into contact with the flange (6) of the flexible pipe (2) and the cap nut (4) is screwed into the pipe. At the end of the flexible tube (2), an insertion tube portion (8) protruding in the length direction is provided, and the inner peripheral surface of the packing (7) is crimped to the insertion tube portion (8). A flexible joint, characterized in that a water stopper (11) having a water hammer preventer (10) as a handle is attached to one end of 2).

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