JP4585432B2 - Pressure welding joint and water piping equipment mounting unit using the same - Google Patents

Description

  The present invention relates to a pressure-welding joint for facilitating the installation and replacement of water pipe equipment typified by a water meter, and improvement of a mounting unit for water pipe equipment using the same.

  Conventionally, in order to facilitate the installation and replacement of water meters, a pressure joint with a slide mechanism on the primary side (upstream side) of the base (base) and a fixed joint on the secondary side (downstream side) There is a known water meter mounting unit (for example, see Patent Document 1). According to the mounting unit, the axial distance from the fixed joint is adjusted by sliding the pressure welding joint in the axial direction, so that the water meter can be attached and detached.

  More specifically, the conventional pressure-welded joint includes a joint body having a rotation operation section such as a handle, and a crimping section that is screw-tightly connected to the joint body in a watertight manner. By turning, the rotational movement is converted into an axial sliding movement of the crimping portion screwed and connected. Moreover, the open end of the crimping | compression-bonding part is provided with the half-shaped receiving part which cut the upper half, and a water meter is horizontally hold | maintained by this half-shaped receiving part. However, in order to slide the crimping part with the water meter held horizontally, the receiving part must always be held in the upward position even during the rotation slide. The connecting portion also has a complicated structure called a co-rotation preventing mechanism that slides the crimping portion in a non-rotating state.

  As a result of intensive studies as a structure for simplifying such a complicated structure, the present inventors have invented another water meter mounting unit shown in FIG. In addition, although the attachment unit which concerns on this another invention is not well-known at this time, since the improvement became the opportunity of this invention creation, it is illustrated as background art for convenience of explanation. That is, the mounting unit according to the another invention has a unit structure in which the press-fit joint 60 is provided on the primary side and the fixed joint 70 is provided on the secondary side in advance at the coaxial position of the base 50. The specific structure is as follows: a joint body 61 in which a female screw 61a is screwed on the inner peripheral surface of the secondary side through hole and a cylindrical inner sleeve 61b is provided concentrically; and the inner sleeve 61b is watertight on the primary side. A threaded portion 62b is provided in the female screw 61a through which the insertable insertion hole 62a is inserted, and an operation portion 62c capable of rotating the threaded portion 62a is provided on the secondary side, and further on the operation portion 62c side. A hollow spindle portion 62 formed with a circular recessed portion 62d capable of communicating with the insertion hole 62a on one end surface (secondary side end portion) thereof, a water passage hole 63a therein, and a secondary The water passage hole at the side end Consisting 3a and communication with the water meter M connection port M1 and crimping portion 63 which is recessed a crimpable sealing gasket 64 with a connection circular hole 63b in a watertight manner. With the joint body 61 and the spindle portion 62 thus omitted from the co-rotation preventing mechanism, the crimping portion 63 has a ring groove 63c provided on the outer periphery thereof and a recessed portion 62d of the spindle portion 62 as shown in FIG. The ring-shaped coupling member 65 fitted in the ring groove 62e provided in the shaft is assembled to the recessed portion 62d of the spindle portion 62 in a state of being able to rotate and fit. The water tightness of the crimping part 63 and the spindle part 62 is maintained by arranging an O-ring 66 in the packing groove 62 f provided in the recessed part 62 d of the spindle part 62 on the back surface of the crimping part 63.

  According to the pressure-welded joint 60 having the above structure, by rotating the spindle portion 62, the screw-in portion 62b having a male screw formed on the outer periphery advances and retreats in the axial direction while rotating along the female screw 61a of the joint main body 61. The crimping part 63 provided at the tip is pressed against the connection port M1 of the water meter M. At this time, the crimping part 63 also slides in the axial direction while rotating together with the spindle part 62. However, since the crimping portion 63 is rotatably coupled to the recessed portion 62d of the spindle portion 62 via the ring-shaped coupling tool 65, the crimping portion 63 is brought into pressure contact with the meter connection port M1 and then fixed to the fixed joint 70. When the spindle part 62 is tightened to increase the pressure contact amount by further reducing the distance, the spindle part 62 only rotates and the crimping part 63 does not rotate, so that the seal packing 64 is prevented from being twisted. To do.

Japanese Patent Laid-Open No. 11-93226

  Among the above-described conventional pressure-welded joints, the structure having a slide mechanism provided with a co-rotation prevention mechanism for the crimping portion has a complicated structure. Further, even in the above-described pressure-welded joint according to another invention of the present inventor, the number of parts is increased by the amount of the ring-shaped coupler 65, and it is difficult to assemble the crimping part 63 via the ring-shaped coupler 65. In addition, since the crimping part 63 is assembled in a fitted and killed state, it cannot be disassembled during maintenance or disposal, which is inconvenient. Furthermore, as a common problem with conventional pressure-welded joints, it is necessary to tighten the spindle part sufficiently to ensure a reliable connection, but the torque often depends on the intuition of the operator, so in actual work Insufficient tightening may cause water leakage. In addition, if the base is warped after the water meter is installed, a slight misalignment occurs in the mouth axis between the connection port of the water meter and the crimping portion. In this case, there is a risk of water leakage. However, the conventional press-fit joint cannot cope with any case.

  The present invention has been made in view of the above-described problems, and its object is to reduce the number of members and to prevent water leakage due to insufficient tightening, warping of the base, etc. while having a simple structure that can be disassembled. It is to provide a pressure welding joint and a mounting unit for water pipe equipment such as a water meter using the same.

  In order to achieve the above-described object, in the present invention, a joint body having a cylindrical inner sleeve concentrically provided with a female screw threaded on the secondary side of the internal through hole and the inner sleeve is provided. A hollow spindle part that is inserted in a watertight manner and screwed into the female screw so as to be able to advance and retreat in the axial direction, and is attached to a secondary side of the spindle part and connected to a connection port of a water pipe device such as a water meter. A pressure welded joint that can be connected by crimping to the spindle, and a circular recessed portion is formed at the secondary side end of the spindle portion, and an O-ring is attached to the outer periphery of the crimped portion. The means for fitting the O-ring mounting portion of the crimping portion into the recessed portion was used. In the above means, the spindle part advances and retreats in the axial direction while rotating as a whole due to the structure of the screwing part, and adjusts the distance from the connection port of the water pipe equipment as a connected member and adjusts the amount of pressure contact. . In conjunction with this, the crimping part rotates and advances and retreats in the axial direction, but even when the spindle part is tightened, the crimping force (frictional force) on the connection port of the crimping part can be higher than the torque applied to the tightening. After that, the non-rotation state occurs, and only the spindle portion rotates and slides in the axial direction. Further, according to the insertion structure of the present invention, since the crimping part is inserted into the recessed part of the spindle part via the O-ring mounted on the outer periphery thereof, not from the fitting as in the prior art, from the recessed part. It can be removed as appropriate.

  Further, according to the second aspect of the present invention, means for selectively forming a water pressure receiving surface at the insertion side end of the crimping portion is selectively used. According to this means, when the water pressure acts on the pressure receiving surface during water flow, the pressure-bonding portion moves in the water flow direction (axial direction), and the pressure-bonding force with the water pipe apparatus is increased with the magnitude and linearity of the water pressure. It becomes possible.

  A third aspect of the present invention is a water pipe equipment mounting unit using a pressure welding joint by the above-mentioned means, and fixes the pressure welding joint to the primary side of the base and sets another joint at the secondary coaxial position of the base. A water pipe device such as a water meter is detachably mounted between both joints. The water plumbing equipment includes various equipment in addition to a water meter.

  Further, according to the present invention, a cradle for supporting the connection port of the water pipe equipment is provided in the vicinity of the pressure joint of the base so that the crimping portion of the pressure joint and the water pipe equipment can be centered. Further, in claim 5, a section steel is adopted as a base, and in this configuration, a modified pipe is used as the section steel in claim 6, and both ends thereof are pressed to form a pedestal.

  Furthermore, in the water piping equipment mounting unit adopting any of the above means, means for pre-installing a water stop cock on the primary side of the pressure-welded joint and a check valve on the secondary side of another joint in advance. Is selectively adopted.

  As described above, according to the present invention, since the crimping portion is inserted into the recessed portion of the spindle portion via the O-ring mounted on the outer periphery, the structure for preventing the joint rotation mechanism and the connecting part with the spindle portion and the like is omitted. In addition to reducing the number of parts, disassembly is also possible, and maintenance and disposal can be easily performed. In addition, since the crimping part is rotatably inserted into the recessed part of the spindle part while maintaining watertightness due to the elastic friction of the O-ring, the fitting structure is crimped when the spindle part is tightened. Since only the spindle portion can be rotated while the portion is stationary, the seal packing that maintains the watertightness between the crimping portion and the water pipe device does not twist. Furthermore, in the case where a pressure receiving surface for water pressure is formed at the primary side end portion of the pressure bonding portion, the pressure bonding portion moves in the water flow direction due to the water pressure acting on the pressure receiving surface, and the water meter is linear with the size of the water pressure. Crimping force against water pipe equipment such as water pipe equipment is ensured, even if the amount of pressure contact is small or the mouth of the crimping part and water pipe equipment is misaligned due to warping of the base, etc. Can be water-tightly pressed.

  In addition, the pressure welded joint as a pair with another joint, which is unitized on the base, is suitable as a mounting unit for water pipe equipment such as a water meter, and is further provided with a crimping portion of the pressure welded joint in the vicinity of the base pressure welded joint. For water piping equipment that has a cradle that supports the connection port of water piping equipment that can be centered, temporary placement before pressure welding of water piping equipment can be easily performed with accurate centering. it can. In addition, since the shape steel is used as the base, it is lighter and cheaper than manufacturing the base by casting. In addition, by using a deformed pipe as the shape steel and forming a pedestal for pressing the both ends to fix the base to the floor surface, the pedestal can be integrally molded and the number of parts can be reduced Therefore, the production can be rationalized and the cost is advantageous. Further, it is more preferable that the base is made of aluminum, so that the base can be light and robust.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of an attachment unit for water pipe equipment, and a pressure-welding joint according to the present invention is provided on the primary side. That is, in the figure, reference numeral 1 is a base made of an atypical pipe made of aluminum, 2 is a pressure welding joint provided on the primary side on the base 1, and 3 is a secondary coaxial position of the base 1 facing the pressure welding joint 2. It is a fixed joint provided at a predetermined interval. Both ends of the base 1 are formed with pedestals 1a and 1a by press working, and the pedestals 1a and 1a can be fixed to a floor surface of a meter box or the like (not shown) by a fastener (not shown) such as a bolt. . Further, in the vicinity of the pressure welding joint 2 on the base 1, there is provided a cradle 4 having a height capable of centering (centering) the connection port M1 of the water meter M and the pressure welding joint 2. The connection port M1 of the water meter M is temporarily placed in the centered state. In addition, 5 is a water stop cock assembled in advance on the primary side of the pressure welding joint 2 via the elbow pipe 6, and 7 is a cartridge type check valve incorporated in advance on the secondary side of the fixed joint 3.

  In the mounting unit having the above structure, the press-fit joint 2 can be roughly divided into a joint main body 21 fixed to the base 1, and a spindle part 22 screwed into the joint main body 1 and capable of moving forward and backward in the axial direction while rotating. , And a crimping portion 23 attached to the secondary side of the spindle portion 22. More specifically, the joint main body 21 has a through hole 21a formed therein, and a cylindrical inner sleeve 21b having a water passage is provided concentrically on the secondary side of the through hole 21a. In addition, a female screw 21c is screwed in the interior range. The inner sleeve 21b has its primary side rear end fixed to the through hole 21a with an O-ring 8a in a watertight manner, and the O-rings 8b and 8c provided at two locations on the outer peripheral surface of the secondary side tip, Retains its watertightness. Note that one end of an elbow pipe 6 for connecting the water stop cock 5 is fitted in a watertight manner on the primary side of the through hole 21 a of the joint body 1 and is screwed by a screw member 9.

  On the other hand, as shown in FIGS. 2 and 3, the spindle portion 22 has a male screw 22b formed on the outer peripheral surface of the primary side of the cylindrical body through which the inner sleeve 21b can be inserted in a watertight manner. And an operating portion 22d formed by radially arranging a plurality of blade-like projecting pieces on the outer peripheral surface of the secondary side as an integral part of the screwing portion 22c. Further, a circular recess 22e having substantially the same diameter as that of the pressure-bonding portion 23 is formed at the end on the operation portion 22d side.

  Further, the crimping portion 23 has a donut shape as a whole with a water passage hole 23a provided therein, and a connection port M1 of the water meter M is inserted and connected to the secondary side end portion thereof in communication with the water passage hole 23a. Possible connection circular holes 23b are recessed. A ring-shaped seal packing 10 is provided in the connection circular hole 23b, and the connection port M1 of the water meter M can be pressure-tightly bonded to the connection circular hole 23b of the structure. Further, a closed ring-shaped packing groove 23c is formed on the outer peripheral surface of the crimping portion 23, and an O-ring 8d is attached to the packing groove 23c. Thus, the crimping portion 23 is concentrically fitted into the recessed portion 22e of the spindle portion 22 in a state where the O-ring 8d is attached to the packing groove 23c. In this fitted state, the crimping portion 23 is rotatably assembled to the recessed portion 22e of the spindle portion 22 while maintaining watertightness by elastic frictional force with the recessed portion 22e by the O-ring 8d. At this time, if the crimping part 23 is pulled out in the secondary axial direction so as to resist the elastic frictional force, the crimping part 23 can be appropriately removed from the recessed part 22e to be used for disassembly. In the inserted state at the time of use, the crimping portion 23 does not inadvertently fall off from the recessed portion 22e of the spindle portion 22 due to the water flow vibration or the like.

  The fixed joint 3 provided on the secondary side of the base 1 also has a crimping part 3 a similar to the crimping part 23 at the opposite side (primary side) end of the press-contacting joint 2. That is, the crimping portion 3a of the fixed joint 3 is also provided with a connecting circular hole 3b into which the connection port M1 of the meter M can be inserted and connected at the primary side end, and the connecting circular hole 3b has a ring shape. A seal packing 11 is provided and is configured to be pressure-tightly watertight with the connection port M1 of the water meter M.

  In order to attach the water meter M to the mounting unit having the above-described configuration, as shown in FIG. 4, first, the protruding amount of the spindle portion 22 of the pressure welding joint 2 is minimized, and the water meter M is interposed between the fixed joint 3. The secondary side connection port M2 is in a tilted posture, and the connection port M2 is inserted into the connection circular hole 3b of the crimping portion 3a on the fixed joint 3 side, and then the primary side connection port M1 is provided in the base 1. The water meter M is placed on the cradle 4 and temporarily placed in a state where the water meter M is held horizontally. Next, the operating portion 22d is operated to rotate the screwing portion 22c, the spindle portion 22 is slid in the axial direction toward the water meter M, and the crimping portion 23 is brought into pressure contact with the connection port M1 of the water meter M. In addition, the water meter M is not necessarily in the inclined posture if there is a sufficient space between the pressure-welding joint 2 and the fixed joint 3 during temporary placement.

  In such an installation operation, according to the present invention, even if the crimping portion 23 is pressed against the connection port M1 and then the spindle portion 22 is tightened to increase the crimping force, the crimping force with the connection port M1 is increased. Does not rotate in conjunction with the spindle portion 22 when the torque becomes larger than the tightening torque of the spindle portion 22. That is, since the crimping portion 23 is in a non-rotating stationary state when a sufficient crimping force is secured, the seal packing 10 is not twisted or twisted, and the water tightness with the connection port M1 is reliably maintained. The In addition, according to the fitting structure, if the force exceeding the elastic friction force described above acts on the crimping portion 23, the crimping portion 23 can be moved in the axial direction. By utilizing this property, in this embodiment, the water passage hole 23a of the crimping portion 23 has a smaller diameter than the insertion hole 22a of the spindle portion 22, and the pressure receiving surface 23d is provided on the back side (primary side) of the crimping portion 23. The pressure-bonding portion 23 is configured to be movable to the connection port M1 side of the water meter M against the elastic friction force by applying a primary water pressure to the pressure-receiving surface 23d. . Therefore, even if the amount of tightening of the spindle portion 22 is small, or distortion such as warping occurs in the base 1 and there is a deviation between the crimping portion 23 and the connection port M1 of the water meter M, the magnitude of the water pressure is Since the crimping force with respect to the connection port M1 of the crimping part 23 can be increased with linearity, water leakage can be reliably prevented.

  The installation of the water meter M is completed as described above, and the water meter M can be removed by turning the spindle portion 22 in the reverse direction.

The partially cutaway side view which showed one Embodiment of the attachment unit of the water piping apparatus which concerns on this invention The principal part disassembled perspective view of the pressure welding joint side in the unit of the present invention The principal part exploded sectional view by the side of the pressure welding joint in the unit of the present invention Explanatory drawing showing the water meter installation procedure for the unit of the present invention Partially cutaway sectional view of a water meter mounting unit according to another inventor's invention Exploded sectional view of the main part on the pressure welded joint side in the same invention unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Pressure welding joint 3 Fixed joint 4 Receptacle 5 Stop cock 6 Elbow pipe 7 Check valve 21 Joint body 22 of pressure welding joint Spindle part 23 Crimping part

Claims (7)

A joint body having a cylindrical inner sleeve concentrically provided with a female screw threaded on the secondary side of the internal through hole, and the inner sleeve is inserted in a watertight manner and screwed with the female screw. This is a press-fit joint consisting of a hollow spindle part that can be moved back and forth in the axial direction, and a crimping part that is attached to the secondary side of the spindle part and that can be connected by watertight crimping to the connection port of water pipe equipment. In addition, a concave portion is formed at the secondary side end of the spindle portion, an O-ring is attached to the outer periphery of the crimping portion, and the O-ring mounting portion of the crimping portion is fitted into the concave portion. Characteristic pressure welded joint. The pressure-welded joint according to claim 1, wherein a pressure-receiving surface for water pressure is formed at an end portion on the insertion side of the crimping portion. The pressure welding joint according to claim 1 or 2 is fixed to the primary side of the base, and another joint is provided at the secondary side coaxial position of the base, and a water pipe device such as a water meter is attached / detached between the joints. An installation unit for water pipe equipment, which can be installed as possible. 4. The water piping equipment mounting unit according to claim 3, wherein a cradle for supporting the connection port of the water pipe equipment is provided in the vicinity of the base pressure joint so that the crimping portion of the pressure joint and the water pipe equipment can be centered. The mounting unit for water pipe equipment according to claim 3 or 4, wherein the base is made of a section steel. 6. The water piping equipment mounting unit according to claim 5, wherein an odd-shaped pipe is used as the shape steel and both ends thereof are pressed to form a pedestal. The water piping equipment mounting unit according to any one of claims 3 to 6, wherein a stop cock is assembled on the primary side of the pressure welding joint, and a check valve is assembled on the secondary side of another joint in advance. .

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