JP2004204481A - Meter piping unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a meter piping unit capable of attaining considerable labor saving in piping work execution at a site to shorten piping work execution time and to reduce a labor cost. <P>SOLUTION: This meter piping unit comprises piping 11 with a pressure reducing function with one end having a connection port connected to fluid piping in a building and with the other end having a connection port connected to a measuring meter 40, and further with a shutoff valve 12 and a pressure reducing valve 13 disposed; piping 20 with a back flow preventing function with one end having a connection port connected to the measuring meter 40 and with the other end having a connection port connected to the fluid piping in the building, and further with a check valve 21 disposed; and a loading frame 10 for loading the piping 11 with the pressure reducing function and the piping 20 with the backflow preventing function. The pressure reducing valve 13 is rotatable around the pipe axis of the piping 11 with the pressure reducing function. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a meter piping unit that replaceably attaches a water meter to a water supply piping system to each dwelling unit, for example, in an apartment house.
[0002]
[Prior art]
In general, in an apartment house, the water supply piping system in each dwelling unit branches a dedicated water supply pipe for each dwelling unit from a water supply standpipe in a common part pipe shaft, and pipes the pipe to each use point in the dwelling unit. Then, in order for the Water Bureau to measure the amount of tap water used in each dwelling unit, a water meter lent by the Water Bureau to each dedicated water supply pipe is installed in the common pipe shaft.
[0003]
Previously, tap water drawn from a water main was temporarily stored in a receiving tank, pumped to a rooftop water tank by a water pump, and supplied to each floor from the water tank via a water supply pipe. The water tank system was the mainstream.
In recent years, a direct water pump system that supplies water directly to each point of use with a water supply pump from a water receiving tank, or a water supply system that does not install a water receiving tank and supplies tap water drawn from a water main to a water supply pump directly to each point of use The direct connection pressure increase method is becoming mainstream.
[0004]
In the case of the above-mentioned water supply equipment of the direct pumping system and the direct water supply booster system, the pressure fluctuation due to the fluctuation of the amount of water used in the supply zone is larger than that of the high water tank system. If the control mechanism fails, the supply pressure may rise abnormally. Therefore, in order to not affect sanitary appliances and to eliminate temperature changes due to fluctuations in water supply pressure in showers, etc., a pressure reducing valve is installed in a dedicated water supply pipe in a common pipe shaft, and it is installed in each dwelling unit. The supply water pressure to be supplied does not exceed a certain pressure.
[0005]
On the other hand, even in the case of office buildings and restaurant buildings, a private meter is installed in a dedicated water supply pipe for each tenant system branched from the water supply stand inside the pipe shaft in order to measure the amount of water used by each tenant. You may have. Also in this case, for the same reason as in the case of an apartment house, a pressure reducing valve may be installed in a dedicated water supply pipe of a tenant system.
[0006]
Also, in the hot water supply facilities, hot water is circulated from the hot water tanks and boilers installed in the machine room, etc. throughout the building by a circulation pump and circulation piping, and the dedicated hot water pipes are branched into pipe shafts on each floor to use hot water. There is also a central hot water supply system that supplies water to the city. In an office building, a restaurant building or an apartment house adopting this method, a private meter for measurement may be installed in a dedicated hot water supply pipe branched from a circulation pipe. In addition, a pressure reducing valve may be installed in a dedicated hot water supply pipe.
[0007]
FIG. 6 is a side view showing a conventional piping structure around a metering meter.
In the figure, 1 is a water supply pipe (fluid pipe) piped in a common pipe shaft of an apartment house, and 2 is a dedicated water pipe branched from the water supply pipe 1 and piped to a use point in each dwelling unit. is there. A water stop valve 3 for shutting off water supply from the water supply standpipe 1 and a pressure reducing valve 4 for keeping the water supply pressure below a certain pressure are connected and fixed to the dedicated water supply pipe 2 by screwing means. Therefore, the water stop valve 3 and the pressure reducing valve 4 are in a fixed state in a fixed direction (constant direction). The pressure reducing valve 4 has a strainer (not shown) on the primary side for preventing a failure due to the inflow of foreign matter.
[0008]
Reference numeral 5 denotes a water meter, which is assembled on the secondary side (downstream side) of the pressure reducing valve 4 in the dedicated water supply pipe 2. The water meter 5 is provided with meter connection sockets 6 and 7 at the primary and secondary ends thereof in order to have a replaceable mounting structure in the event of a failure. These meter connection sockets 6 and 7 are formed of cap nuts and have a structure in which the connection-side end of the water meter 5 is detachable. Note that the meter connection socket 7 has an expansion / contraction function in order to cope with a case where the replacement water meter 5 is different in size from the conventional water meter. In addition, a check valve 8 is provided in a dedicated water supply pipe on the secondary side of the water meter 5 so that water retained in the secondary side pipe does not flow out when the water meter is replaced. Further, a pipe connection socket 9 for connecting a single water supply pipe to a use point of each dwelling unit is connected to a dedicated water supply pipe on the secondary side of the check ring 8.
In addition, a connection socket or a short pipe is inserted and connected as needed at a portion where each valve is connected.
The above is the piping structure around the measuring meter (water meter) of the dedicated water supply system to each dwelling unit. The same piping structure is used for the piping around the measuring meter of the dedicated hot water supply pipe to each dwelling unit.
[0009]
[Problems to be solved by the invention]
Since the piping around the conventional metering meter is configured as described above, the metering around the water stop valve 3, the pressure reducing valve 4, the sockets 6 and 7 for connecting the meter, the check valve 8 and the socket 9 for connecting the pipes, etc. In this case, there is a problem that a lot of time is required for the piping work and labor costs are required.
[0010]
In addition, when valves are mainly made of copper and the dedicated water supply pipe 2 is a lining steel pipe, it is necessary to interpose an insulating socket or a joint for preventing pipe end corrosion before and after the valves from the viewpoint of preventing dissimilar metal corrosion. Therefore, there is a problem that the entire length of the pipe around the metering meter is inevitably increased. Particularly, in a common pipe shaft of an apartment house, since the space is narrow, there is a problem that if the total length of the pipe around the metering meter is long, it is difficult to store the pipe in the common pipe shaft.
[0011]
Further, since the water stop valve 3 and the pressure reducing valve 4 are fixed so as not to rotate with respect to the dedicated water supply pipe 2, the projecting directions of the water stop valve 3 and the pressure reducing valve 4 from the dedicated water supply pipe 2 are taken into consideration. Therefore, there is a problem that the piping work is more troublesome and the workability during maintenance is poor. That is, the pressure reducing valve 4 requires periodic cleaning of the strainer incorporated therein and periodic maintenance of the diaphragm portion of the pressure reducing mechanism. The maintenance is performed by stopping water supply with the water stop valve 3. As described above, when the inside of the pipe shaft is narrow, the emphasis is placed on housing the piping, and the pressure reducing valve 4 and the water stop valve 3 are often mounted in a direction in which the maintenance work is difficult, so that the maintenance is difficult. There was a problem that workability at the time was very poor.
[0012]
The present invention has been made in order to solve the above-described problems, and provides a meter piping unit that can greatly save labor for piping work on site, shorten the piping work time and reduce labor costs. The purpose is to:
[0013]
Another object of the present invention is to provide a meter piping unit that is easy to maintain.
[0014]
Still another object of the present invention is to provide a meter piping unit that can significantly reduce the size of piping around a metering meter such as a water meter, reduces installation space, and can be easily installed even in a narrow pipe shaft. I do.
[0015]
Furthermore, the present invention improves the degree of freedom in the connection direction of the dedicated water supply pipe to each dwelling unit, and requires a separate branch joint even when branching water in multiple directions after the secondary side of the pipe around the metering meter. The aim is to provide a meter piping unit that does not.
[0016]
[Means for Solving the Problems]
A meter piping unit according to the present invention has a connection port connected to a fluid pipe in a building at one end, a connection port connected to a metering meter at the other end, and a pressure reducing valve having a closing valve and a pressure reducing valve. A pipe with a function, having a connection port connected to the metering meter at one end, having a connection port connected to a fluid pipe in the building at the other end, and a backflow prevention function pipe provided with a check valve; And a mounting base for loading the pipe with the pressure reducing function and the pipe with the backflow prevention function, wherein the pressure reducing valve is rotatable around a pipe axis of the pipe with the pressure reducing function.
[0017]
The closing valve and the pressure reducing valve of the meter piping unit according to the present invention are integrally formed and are rotatable around a pipe axis of the piping with the pressure reducing function.
[0018]
The pipe with a backflow prevention function of the meter pipe unit according to the present invention has a plurality of connection ports connected to fluid pipes in a building.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1 FIG.
1 is a side view showing a meter piping unit according to Embodiment 1 of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is an enlarged sectional view of FIG. 1 showing a side view of the unit.
In the drawing, reference numeral 10 denotes a loading stand for loading pipes around the metering meter. The loading stand 10 is provided with a piping 11 with a decompression function and a pipe 20 with a backflow prevention function. A substitute pipe 30 (see FIG. 4) or a metering meter 40 before a metering meter (water meter or hot water meter) is installed is detachably connected to the functioning pipe 20.
[0020]
The pipe 11 with a decompression function has a connection port connected to a fluid pipe (water supply pipe 1 in FIG. 6) in the building at one end and a connection port connected to the metering meter 40 at the other end. A shutoff valve 12 and a pressure reducing valve 13 are provided on the pressure reducing pipe 11. The closing valve 12, the pressure reducing valve 13, and a cap nut N2 to be described later are integrally formed, and are rotatable about the pipe axis of the pipe 11 with a pressure reducing function. The closing valve 12 has a built-in strainer 14.
[0021]
In addition, a cap nut N1 for connecting to the fluid pipe is provided at a connection port on the primary side of the pipe 11 with a pressure reducing function. This cap nut N1 is a joining method of being inserted into the closing valve 12. More specifically, a seal ring groove 19a is provided on the outer peripheral surface of the secondary-side connection port of the cap nut N1, and the seal ring 19 is attached to the groove 19a, thereby maintaining watertightness. Further, outward flanges 19b and 11a are integrally formed on the outer periphery of the joining pipe end of the cap nut N1 and the pipe 11 with a pressure reducing function, respectively, and the flanges 19b and 11a are joined with the flanges 19b and 11a butt-joined. The clip C is sandwiched between them to prevent falling off.
[0022]
The primary-side meter connection pipe 15 has a connection method in which the primary-side connection port is inserted into a cap nut N2 on the secondary side of the piping 11 with a pressure reducing function. More specifically, a seal ring groove 15a is provided on the outer peripheral surface of the primary connection port of the primary meter connection pipe 15, and watertightness is maintained by attaching a seal ring 15b to the groove 15a. Further, at the connection portion between the cap nut N2 and the primary-side meter connection pipe 15, four pin holes (not shown) for inserting the U-shaped fixing pin P1 from outside are provided. A groove 15c for a U-shaped stop pin is provided on the outer peripheral surface of the primary connection port, and after inserting and joining the primary meter connection pipe 15 to the cap nut N2, the groove 15c for the U-shaped stop pin is formed from the pin hole. By inserting a U-shaped stopper pin P1 into the rim, the pillow is prevented from falling off.
[0023]
A rubber seal ring 16, a metal ring-shaped pin 17, and a cap nut 18 are provided at the end of the secondary pipe of the primary-side meter connection pipe 15. The primary side of the meter 40 is detachably connected to the secondary side of the primary-side meter connection pipe 15.
[0024]
On the other hand, the pipe 20 with the backflow prevention function has a connection port for connecting to the substitute pipe 30 or the metering meter 40 at one end, and a fluid pipe (water supply from the metering meter 40 is used in the dwelling unit at the other end) in the building. The pipe 20 has a connection port for connecting to the pipe (the pipe leading to the pipe), and a check valve V is disposed in the check-flow prevention function pipe 20. As shown in FIG. 1 to FIG. 3, the pipe 20 with the backflow prevention function includes a primary-side connection pipe section 20 a connected to the secondary side of the metering meter 40 and a secondary side of the metering meter 40 inside the dwelling unit. It has a plurality of connection ports 20b to 20e for connecting fluid pipes to the point of use.
[0025]
The secondary side of the metering meter 40 or the substitute pipe 30 is detachably attached to the primary-side connection pipe section 20a of the pipe 20 with the backflow prevention function via the secondary-side meter connection pipe (straight pipe) 21 by the cap nut 22. To be connected to. Here, the secondary-side meter connection pipe 21 can be expanded and contracted with respect to the primary-side connection pipe section 20a of the pipe 20 with the backflow prevention function, and the expansion and contraction adjustment corresponds to the size of the metering meter 40. The length can be adjusted. The secondary-side meter-connecting pipe 21 has a rubber seal ring 23 and a ring-shaped pin 24 on the primary side, and a seal ring 25 on the secondary side.
[0026]
As shown in FIG. 4, the meter piping unit configured as described above has a substitute pipe 30 connected between the secondary side of the pipe 11 with the pressure reducing function and the primary side of the pipe 20 with the backflow prevention function. Delivered to the site. Then, at the site, in this state, it is installed at a predetermined position in the pipe shaft and fixed to the floor surface. The primary side of the pipe 11 with the pressure reducing function is connected to the fluid pipe in the building (the dedicated water supply pipe 2 branched from the water supply standing pipe 1 in FIG. 6) by the cap nut N1. At least one of the secondary connection ports 20b to 20e is connected to a pipe that reaches a use location in the dwelling unit. Further, among the secondary connection ports 20b to 20e, those not connected to the pipe are stopped by a plug or the like. After the water pressure test and the flushing (cleaning) of the inside of the pipe are completed, the substitute pipe 30 is removed, and the metering meter 40 is connected between the secondary side of the pipe 11 with the pressure reducing function and the primary side of the pipe 20 with the backflow prevention function by the cap nut 18. , 22 and the piping is completed.
[0027]
【The invention's effect】
As described above, according to the present invention, a pipe with a pressure reducing function having a shutoff valve and a pressure reducing valve, one end of which is connected to a fluid pipe in a building, and the other end of which is connected to a metering meter, And a pipe with backflow prevention function, one end of which is connected to the metering meter and the other end of which is connected to the fluid pipe in the dwelling unit, is mounted on the mounting base to form a meter piping unit, so that a closing valve or a pressure reducing valve is provided. In addition, the piping around the meter, such as a socket for connecting a meter and a check valve, can be delivered to the site as a unit, and the unit only needs to be installed directly at the place where the piping around the metering meter is installed. This has the effect of shortening the construction time and reducing labor costs. In addition, since the pressure reducing valve is configured to be rotatable around the pipe axis of the pipe with the pressure reducing function, the pressure reducing valve can be rotated in a direction that facilitates the work at the time of maintenance, and the meter piping unit is installed at the time of piping. There is an effect that it can be arranged in the pipe shaft without taking the direction of the pressure reducing valve into consideration when storing.
[0028]
Further, according to the present invention, since the closing valve and the pressure reducing valve are integrally formed so as to be rotatable about the pipe axis of the pipe with the pressure reducing function, the closing valve and the pressure reducing valve are easily operated during maintenance. Can be integrally rotated, and at the time of piping construction, when the meter piping unit is housed, it can be arranged in the pipe shaft without considering the directions of the closing valve and the pressure reducing valve.
[0029]
Further, according to the present invention, the shutoff valve and the pressure reducing valve are integrated with each other, so that the pressure reducing valve, the connection pipe, and the socket for connecting the meter are integrated with each other. The socket and the integrated structure can be integrated, and the check flow prevention valve is built into the pipe with the back flow prevention function, so the piping around the metering meter can be made much more compact than a structure connected with a nipple or short pipe. This has the effect of reducing the installation space and facilitating installation even in a narrow pipe shaft.
[0030]
Further, according to the present invention, since the plurality of connection ports to which the plurality of fluid pipes can be connected are provided on the secondary side of the pipe with the backflow prevention function, the degree of freedom in the connection direction of the dedicated water supply pipe is improved. effective. In addition, there is an effect that it is not necessary to separately prepare a branch joint even when water is branched into a plurality of portions after the secondary side of the pipe with the backflow prevention function.
[0031]
Furthermore, according to the present invention, as described above, since a plurality of connection ports to which a plurality of fluid pipes can be connected are provided on the secondary side of the pipe with the backflow prevention function, the connection ports to which the pipes are not connected are provided. If there are two or more locations, connect a hydraulic test pump and a pressure gauge to each connection port, apply water pressure to the piping with the hydraulic test pump, and perform a hydraulic test at the completion of piping in dwelling units and pipe shafts There is an effect that can be.
[Brief description of the drawings]
FIG. 1 is a side view showing a meter piping unit according to Embodiment 1 of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a side view showing a meter piping unit before the installation of a weighing meter.
FIG. 5 is an enlarged sectional view of FIG.
FIG. 6 is a side view showing a conventional piping structure around a metering meter.
[Explanation of symbols]
10 Loading stand 11 Piping with pressure reducing function 11a Flange 12 Closing valve (water shutoff valve)
13 Pressure reducing valve 14 Strainer 15 Primary side meter connection pipe 15a Seal ring groove 15b Seal ring 15c U-shaped retaining pin groove 16 Seal ring 17 Ring-shaped pin 18 Cap nut 19 Seal ring 19a Seal ring groove 19b Flange 20 Backflow prevention function Attached piping 20a to 20e Connection port 21 Secondary side meter connection pipe 22 Cap nut 23 Seal ring 24 Ring pin 25 Seal ring 30 Substitute pipe 40 Metering meter (water meter or hot water meter)
C clip N1, N2 Cap nut P1 U-shaped stop pin V Check valve

Claims (3)

One end has a connection port connected to a fluid pipe in the building, the other end has a connection port connected to a metering meter, and a pipe with a pressure reducing function in which a closing valve and a pressure reducing valve are disposed; and A connection port for connecting at one end, a connection port for connecting to a fluid pipe in the building at the other end, and a pipe with a backflow prevention function provided with a check valve, the pipe with a pressure reduction function and the backflow prevention In a meter piping unit including a loading frame for loading a pipe with a function, the pressure reducing valve is rotatable around a pipe axis of the pipe with a pressure reducing function. The meter piping unit according to claim 1, wherein the closing valve and the pressure reducing valve are integrally formed and are rotatable around a pipe axis of the piping with the pressure reducing function. The meter piping unit according to claim 1 or 2, wherein the pipe with a backflow prevention function has a plurality of connection ports connected to fluid pipes in the building.

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