JP3173762U - Connection structure between water meter and piping - Google Patents

Abstract

Provided is a connection structure capable of compressing a packing by a predetermined amount when a long cap nut is attached to a screw part in a construction for replacing a first meter with a second meter having a shorter face-to-face dimension. .
An adapter has a through hole, and the through hole has a small diameter portion and a large diameter portion, and is connected by a shoulder at an intermediate portion thereof. The large-diameter portion is provided with a female screw that is screwed into a male screw provided at the inlet or outlet of the second meter, and a male screw having the same diameter as the male screw of the second meter is provided on the outer periphery on the small-diameter portion side. When the adapter is assembled to the meter, the end of the inlet or outlet of the meter contacts the shoulder, and the distance between the shoulder and the one end of the adapter is the first meter and the second end. It becomes equal to the difference of the inter-surface dimension with the meter. An incompressible ring-shaped spacer 41 is arranged between the flange 33 of the shimok 31 and the bottom surface of the screw hole of the cap nut 39. Even if the packing 37 is compressed by a predetermined amount, the tip of the cap screw remains at the root of the male screw portion of the adapter. Do not reach.
[Selection] Figure 4

Description

  The present invention relates to a connection structure between a water meter and piping. More specifically, when replacing the water meter, if the face-to-face dimension of the newly installed meter is shorter than the face-to-face dimension of the existing meter, use it with the adapter that is attached to the newly installed meter. It relates to a spacer.

  Currently, water meters are to be replaced every 8 years according to the law. By the way, a meter with a nominal diameter of 13 currently used is generally one having a dimension between the inlet end and the outlet end of the water supply, so-called inter-surface dimensions of 165 mm and 100 mm. However, depending on the water utility, for example, a meter having a surface dimension of 114 mm has been used. However, as described above, those having a face-to-face dimension of 165 mm and 100 mm are common, and therefore, it is easier to obtain from a meter having a face-to-face dimension of 114 mm. Therefore, when replacing the meter, it would be advantageous if a meter with a face-to-face dimension of 100 mm could be used instead of the meter with a face-to-face dimension of 114 mm.

However, the pipes including the stop cocks and check valves connected to both sides of the meter are naturally sized according to the meter with a face-to-face dimension of 114 mm. For example, a meter with a face-to-face dimension of 100 mm is installed. Therefore, if it is going to be replaced, the length of the piping is not sufficient as it is, and it is necessary to redo the piping work. However, the pipes on the downstream side of the meter are usually buried in the ground, and it takes a lot of time and money to start new piping work again.

  By the way, an existing meter having a face-to-face dimension of 165 mm may be replaced with a meter having a face-to-face dimension of 100 mm using a 65 mm supplementary tube. In this case, since the supplementary pipe has a sufficient length, a screw for connecting the pipe to the supplementary pipe can be formed. However, even if you try to use a 14 mm long supplemental tube to replace a meter with a face dimension of 114 mm with a meter with a face dimension of 100 mm, the length is not enough, so you can ensure a firm and secure connection with the pipe. A screw with a length of cannot be formed.

Therefore, in order to solve this problem, the present applicant, in Utility Model Registration No. 3165658, when replacing the installed first water meter with a second water meter having a face-to-face dimension shorter than the first meter. An adapter for use with 2 meters was provided. Hereinafter, the adapter will be described with reference to FIGS. FIG. 1 is a partially cutaway front view of a water meter with an adapter attached thereto, and FIG. 2 is a longitudinal sectional view of the adapter with a seal ring attached.

  As shown in FIG. 1, an adapter 11 is attached to the inlet 3 of the meter 1. The meter 1 is a meter after replacement. The dimension between the end portion on the inlet 3 side and the end portion on the outlet 5 side, the inter-surface dimension L1 is the distance between the surfaces of the meter (not shown) installed before the replacement. It is shorter than the dimension L2. That is, the meter installed before the replacement is a less common meter having a face-to-face dimension of, for example, 114 mm, and the meter 1 after replacement is a general one having a face-to-face dimension of 100 mm, and is easily available. is there. An upstream pipe including a stop cock (not shown) is provided on the upstream side (left side in FIG. 1) of the meter 1, and a downstream pipe including a check valve is provided on the downstream side. Yes.

  The adapter 11 includes a through-hole 13, and the through-hole 13 is one end side in the axial direction of the adapter 11, that is, the small-diameter portion 15 that is upstream when attached to the meter 1, and the other end side, that is, the downstream side. The large-diameter portion 17 is larger in diameter than the small-diameter portion 15. A boundary portion between the small diameter portion 15 and the large diameter portion 17 is a shoulder portion 19 that extends in the radial direction. The outer diameter of the adapter 11 is also smaller at one end than at the other end.

A male screw 21 having the same diameter as the male screw of the inlet 3 or the outlet 5 of the meter 1 is formed on the outer periphery of the adapter 11 at one end in the axial direction. On the other hand, a female screw 18 that is screwed into the male screw 4 formed on the outer periphery of the inlet 3 of the meter 1 is formed in the large diameter portion 17 of the through hole 13 on the other end side. A groove 23 extending in the circumferential direction is formed in the shoulder portion 19 in the through hole 13 so as to surround the small diameter portion 15 of the through hole 13, and a seal ring 25 constituted by an O-ring is received. As shown in the figure, the groove 23 is inclined on the outer peripheral wall side, the inlet side of the groove 23 is narrowed, and is formed in a so-called “Arimizo” shape, and the O-ring is difficult to come off.

As shown in FIG. 1, the length from the shoulder portion 19 of the adapter 11 to the end portion on one end side is the distance L2 between the faces of the meter installed before replacement and the distance L1 between the faces of the meter 1 after replacement. Is equal to the difference. Accordingly, with the seal ring 25 attached, the female screw 18 of the adapter 11 is screwed into the male screw 4 of the inlet 3 of the meter 1 as shown in FIG. 1, and the end of the inlet 3 of the meter 1 passes through the adapter 11. When tightened until it abuts against the shoulder 19 in the hole 13, the length from the outlet 5 side end of the meter 1 to the end on the one end side of the adapter 11 matches the face-to-face dimension of the meter before replacement. Become. Therefore, even if a meter with a long face-to-face dimension is replaced with a meter with a short face-to-face dimension, there is no need to rework the piping on both sides of the meter and no additional piping work is required. The meter can be easily replaced.

  By the way, in recent years, PVC pipes are used for water pipes, so-called shimok is attached to the end of the pipe, and the shimok is attached to the inlet or outlet of the meter using a cap nut. When this adapter is used, the adapter is naturally connected to this shimok. In this case, depending on the cap nut used, the threaded portion is long, and before the packing 37 disposed between the end of the adapter 11 and the end of the shimoku 31 is compressed as shown in FIG. Alternatively, the nut 39 may hit the inner end of the male threaded portion 21 of the adapter 11 before being fully compressed, and the packing 37 may not be sufficiently compressed. The shimoku 31 is bonded to a polyvinyl chloride pipe, and the tip of the shimoku 31 is enlarged in outer diameter so as to prevent the cap nut 39 from being pulled out, thereby forming a flange 33. That is, neither the cap nut 39 nor the shimoku 31 can be removed. In order to replace the cap nut 39, it is necessary to reconstruct the piping. Further, as described above, the length of the adapter 11 is a length corresponding to the difference between the dimensions of the two meters, and the length of the external thread portion 21 on the outer periphery of the small diameter portion cannot be sufficiently increased.

  In addition, although a countermeasure method using two sheets of packing is also conceivable, in this case, the packing may be compressed too much, and the packing may deteriorate due to secular change, which may result in impossible sealing. .

Utility Model Registration No. 3165658

  The present invention has been made in view of the above-mentioned conventional problems. If the female screw part of the cap nut attached to the installed pipe is too long and the cap nut is tightened as it is, the nut tip is the male screw part of the adapter. To provide a connection structure that can compress the packing sufficiently by shortening the meshing length between the male screw part of the adapter and the female screw part of the cap nut when the packing cannot be compressed sufficiently due to contact with the inner end of Is the subject.

In order to solve the above problems, in the present invention, an incompressible ring spacer is provided between a flange provided at the end of the shimoku and an inner end surface of a hole in which a female screw of a cap nut fitted to the shimoku is formed. Arranged. That is, in the present invention, when the first water meter that has been installed is replaced with a second water meter that has a shorter face-to-face dimension than the first meter, the second water meter is connected to the installed pipe. In the connecting structure, a cylindrical adapter having a through-hole is attached to the inlet or outlet of the second meter, a flange provided at the end of the shim fixed to the end of the installed pipe, and a shaft to the shimoku An incompressible ring-shaped spacer is placed between the inner end face of the hole formed with the female screw of the cap nut fitted in a direction movable, and the cap nut is screwed into the male screw formed on the adapter and tightened. The packing disposed between the end of the adapter and the end of the shimoku is compressed, and the through hole of the adapter has a small diameter portion on one end side in the axial direction of the adapter, and a small diameter portion of the small diameter portion. Expands radially at the inner end A large-diameter portion on the other end side connected to the small-diameter portion via a portion, and the other end side is provided with a female screw threadedly engaged with a male screw provided at the inlet or outlet of the second meter. The outer circumference of the side is provided with a male screw having the same diameter as the male screw of the second meter, and when the adapter is assembled to the second meter, the end of the inlet or outlet of the second meter abuts the shoulder, The distance between the shoulder and the one end is equal to the difference in inter-surface dimension between the first meter and the second meter. The length of the adapter's male screw, the length of the cap nut's female screw, and the thickness of the spacer are such that when the cap nut is tightened to the adapter's male screw when no spacer is present, the end of the cap nut is In this case, the packing cannot be compressed by a predetermined amount, and the presence of a spacer determines the dimensions so that even if the cap nut is tightened and the packing is compressed by a predetermined amount, the tip of the cap nut does not reach the root of the male thread of the adapter. It has been.

As described above, between the flange provided at the end of the shim fixed to the end of the installed pipe and the inner end surface of the hole in which the female screw of the cap nut fitted to the shim so as to be axially movable is formed. By placing an incompressible ring-shaped spacer, even if the cap nut is tightened and the packing is compressed by a predetermined amount, the end of the cap nut does not reach the root of the male thread of the adapter, and the sealing function of the packing is achieved. Can be secured.

It is a partially cutaway side view of the water meter with the adapter attached. It is a longitudinal cross-sectional view of the adapter of the state which attached the seal ring. It is a longitudinal cross-sectional view which shows a state when the internal thread part of a cap nut is too long. It is a longitudinal cross-sectional view which shows the state which compressed the packing using the spacer. It is the front view and side sectional drawing of a spacer.

  Hereinafter, the connection structure of the present invention will be described with reference to FIG. The meter and the adapter are the same as those shown in FIGS. 1 and 2, and the structures to be coupled are the same. Therefore, the adapter 11, the shimoku 31, the cap nut 39, the packing 37, and the spacer 41 are shown in the figure. Only shown. The adapter 11, shimoku 31, cap nut 39, and packing 37 are the same as those shown in FIG.

As shown in the figure, a spacer 41 is used in this embodiment. The spacer 41 is made of an incompressible material having elasticity, and a part thereof is cut as shown in FIG. When this spacer is fitted to the shimoku 31 as shown in the figure and the cap nut 39 is tightened, it is sandwiched between the flange 33 of the shimoku 31 and the inner bottom surface of the cap nut 39, whereby the female screw portion of the cap nut 39 and the adapter 11 is adjusted so that the end of the female thread of the cap nut 39 does not hit the inner end of the male thread of the adapter 11 even when the packing 37 is sufficiently compressed.

Claims (1)

In the connection structure for connecting the second water meter to the installed pipe when the installed first water meter is replaced with a second water meter having a face-to-face dimension shorter than the first meter, A cylindrical adapter having a through-hole is attached to the inlet or outlet of the second meter, and the flange provided at the end of the shim fixed to the end of the installed pipe is movable in the axial direction. An incompressible ring-shaped spacer is disposed between the inner end face of the hole formed with the female screw of the cap nut fitted to the screw nut, and the cap nut is screwed onto the male screw formed on the adapter and tightened, The packing disposed between the end portion of the adapter and the end portion of the shimok is compressed, and the through hole of the adapter has a small diameter portion on one end side in the axial direction of the adapter, and the small diameter Diameter at the inner end of the section A large diameter portion on the other end side connected to the small diameter portion via a shoulder portion that extends to the other end, and a female screw that engages with a male screw provided at the inlet or outlet of the second meter on the other end side. A male screw having the same diameter as the male screw of the second meter on the outer periphery on the one end side, and an end of the inlet or outlet of the second meter when the adapter is assembled to the second meter. And the distance between the shoulder and the one end is equal to the difference in inter-surface dimension between the first meter and the second meter. The length of the female nut of the cap nut and the thickness of the spacer are such that when the cap nut is tightened to the male screw of the adapter when the spacer does not exist, the tip of the cap nut is the male screw portion of the adapter. Hitting the root The tip of the cap nut does not reach the root of the male screw portion of the adapter even if the cap nut is tightened and the packing is compressed by a predetermined amount due to the presence of the spacer. Connection structure, characterized in that the dimensions are determined as follows.

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