JP3509061B2 - Water meter - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water meter.

[0002]

2. Description of the Related Art FIG. 4 shows an example of general piping of a water meter in the prior art. Reference numeral 11 is a water meter connected to a water pipe, and a water stopper 12 is provided on the primary side of the water meter. Check valves 13 are respectively connected to the next side. 14
14 is a pipe end anticorrosion joint.

By the way, when piping work is completed in a dwelling unit or the like, a water flow test must be conducted. At this time, in order to prevent the water meter from being added, conventionally, the water meter is removed from the water pipe, and instead, it is directly connected. The pipe was connected to conduct a water flow test.

[0004]

As described above, the water meter 11 which has been conventionally connected during the water passage test is temporarily removed, a straight pipe is arranged at the connection portion, and the straight pipe is removed after the water passage test is completed. Since the work of reattaching the water meter 11 was carried out, the series of works was very troublesome. Especially, since the water meter 11 is usually buried in the ground together with the meter box, there is a problem that it is difficult to replace the straight pipe with the water meter.

Furthermore, the water meter is required by law (measurement law) to be replaced regularly (every eight years), but at the time of such meter replacement, the old water meter is removed and a new water meter is installed. Such a work was forced, and it took a lot of time and labor like the above-mentioned replacement work from the straight pipe.

By the way, a check valve 13 is generally connected to the secondary side of the water meter 11 from the viewpoint of preventing backflow of water. Since the check valve 13 has a structure for opening and closing the valve by the flow of water, conventionally, the check valve 13 was horizontally connected to the water meter 11 as shown in FIG. Therefore, if the check valve 13 needs to be replaced due to a failure or the like, the check valve 13 must be removed from the pipe and replaced with a new check valve 13. This replacement work was very laborious work like the replacement work of the water meter described in the prior art.

Further, in the past, since the water meter, the water stopcock and the check valve were all separate components, they had to be connected in sequence during the piping work, and there was the problem that the number of operations was large.

The present invention has been made on the basis of the above-mentioned problems, and an object thereof is to provide a water meter capable of easily performing work such as pipe connection and meter exchange.

[0009]

In order to achieve the above object, the present invention comprises a meter housing for removably accommodating a measuring mechanism and a cap for sealing the meter housing in a watertight manner. A water stopcock is provided on the primary side, and a cylindrical mounting port is formed on the secondary side with a predetermined inclination angle. We adopted the means of unitizing the faucet and the check valve as one member. Here, it goes without saying that the water stopper and the end of the check valve and the end of the meter housing on the side where the check valve is located have a joint connectable to piping. According to the means, the pipe connection is completed only by connecting both ends of the water meter of the present invention. Further, once the pipes are connected, the measuring mechanism can be replaced in the connected state. Also, if a cap is attached to the upper body with the measuring mechanism removed, it will function as a straight pipe during the water flow test.

[0010]

In the second aspect, a means for providing a pressure reducing valve between the meter housing and the water stopcock is adopted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a vertical cross-sectional view of a water meter showing a first embodiment, in which 1 is a meter housing for accommodating the measuring mechanism 2 shown in FIG. 3, 3 is a cap which can be screwed into the meter housing 1, and 4 is a meter. A water stopcock 5 integrally provided on the primary side of the housing 1 is a check valve integrally provided on the secondary side of the meter housing 1.
6.6 is a joint connectable to a water pipe.

The meter housing 1 is formed with a flange 1a that divides the interior into upper and lower parts, and water flows in the direction of the arrow through the water passage 1b. Meter housing 1 of the structure
The weighing mechanism 2 is fitted into the above, and the cap 3 is screwed through the packing 7 and the transparent plate 8 made of plastic or glass with the step portion 2a of the weighing mechanism 2 placed on the flange 1a. The mechanism 2 can be watertightly sealed in the meter housing 1. Then, the water meter is confirmed by opening the lid 2b provided on the cap 2 and passing through the glass plate 8. The metering mechanism 2 can employ, for example, a tangential flow impeller type mechanism. The impeller is provided in the lower stage of the step portion 2a, and the flow straightening plate, the pointer, and the like are provided in the upper stage of the step portion 2a.

On the other hand, during the water flow test, the meter housing 1 is kept watertight by simply screwing the cap 3 into the meter housing 1 without inserting the metering mechanism 2 into the meter housing 1, and the flow path 1b is used for the flow path. Therefore, the water meter of the present invention functions as a straight pipe. Further, when the meter is replaced, the cap 3 is removed, and the metering housing 2 is replaced with a new measuring mechanism 2, whereby the replacement work is completed.

As described above, the water meter of the present invention is provided with the meter housing 1 to which the metering mechanism 2 can be attached and detached, and the meter housing 1 is sealed watertight by the cap 3. Therefore, once the water meter is connected by piping. For example, the water flow test and meter replacement can be performed while connected.

On the other hand, in the water meter of this embodiment, the check valve 5 is provided with respect to the cylindrical mounting port 9 formed on the secondary side of the meter housing 1 at a predetermined inclination angle (60 degrees in this embodiment). It is stored detachably. The mounting port 9 has a female screw 9a that is screwed into a male screw 5a provided on the outer periphery of the check valve 5 inside thereof, has an abutment step 9b that supports the lower end of the check valve 5, and mounts it. Water enters from the lower opening 9c of the mouth 9 and flows to the secondary side from the lateral opening 9d.

On the other hand, the check valve 5 normally closes the valve body 5c by the urging force of the spring 5b, and if there is water flowing from the meter housing 1 side, the flow pressure of the check valve 5 opens the valve body 5c. It has a structure. With this structure, the check valve 5 is detachably accommodated in the mounting port 9, and the lower opening 9c of the mounting port 9 is opened and closed by the valve body 5c in response to the presence or absence of water flow.

As described above, in this embodiment, the check valve 5 is detachably accommodated in the mounting port 9 which is integrally formed on the secondary side of the meter housing 1, so that the water meter can be connected to the pipe. The check valve 5 can be replaced.

In this embodiment, the water stopper 4 is also integrally provided on the primary side of the meter housing 1, and when the metering mechanism 2 or the check valve 5 is replaced, the knob 4a is operated to stop the water. You can That is, the water meter according to the present embodiment has a structure in which the meter housing 1, the water stopcock 4, the check valve 5, and the pipe end joints 6 and 6 are unitized into one unit, which can be connected to the pipes as one member. it can.

FIG. 3 shows a second embodiment, in which a pressure reducing valve 10 is integrally provided between the meter housing 1 and the water stopcock 4. That is, the feed water pressure is adjusted by rotating the adjusting screw 10a to move the valve body 10b up and down and changing the clearance of the flow path 10c. For example, in a water supply system of a high-rise house where a water tower is installed on the rooftop, the pressure of the water supply to each house increases on the lower floors, and problems such as water hammer are likely to occur due to the excessive water supply pressure. The provision of the pressure reducing valve 10 makes it possible to reduce the water supply pressure on the lower floors to an appropriate level.

[0021]

As described above, according to the present invention, the piping of the water meter, the water stop valve and the check valve is completed only by connecting the two end portions, and the number of piping work is greatly reduced. I was able to. In addition, since the meter housing that removably accommodates the metering mechanism is provided, the metering mechanism can be replaced while the pipe is connected, and it is not necessary to disconnect the water meter itself from the pipe as in the conventional case, and the replacement work is extremely difficult. It can be done easily. Also, if the metering mechanism is removed and the cap is sealed, the water meter of the present invention functions as a straight pipe, so there is no need to replace the straight pipe with the water meter as in the conventional case, and the piping work itself is simplified. Can be

In the case where the check valve is detachably attached to the mounting port provided on the secondary side of the meter housing, the check valve can be replaced with the water meter connected to the pipe. Furthermore, since the mounting opening is inclined,
Tool operation is easy even in a small meter box,
The check valve can be easily replaced. Further, in the case where the pressure reducing valve is provided between the meter housing and the water stopcock, it is possible to reduce the overpressure of the water supply pressure to make it appropriate.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a weighing mechanism.

FIG. 3 is a partial cross-sectional view showing a second embodiment of the present invention.

FIG. 4 is an explanatory view showing a conventional general piping example.

[Explanation of symbols]

1 meter housing 2 Weighing mechanism 3 caps 4 stopcock 5 Check valve 6 joints 7 packing 8 transparent plate 9 Check valve mounting port 10 Pressure reducing valve

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-3-147941 (JP, A) JP-A-7-82768 (JP, A) JP-A-11-93226 (JP, A) Actual development Sho-60- 165809 (JP, U) Japanese Patent Publication 3-17285 (JP, B2) Actual Public Publication 7-52589 (JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01F 1/00 G01F 15 / 14 G01F 15/18 E03B 7/07

Claims (2)

(57) [Claims] 1. A meter housing detachably accommodating a metering mechanism, and a cap for sealing the meter housing in a watertight manner. The meter housing is integrally provided with a water stopcock on its primary side, and the secondary side. With a certain inclination angle to the side
A water meter characterized in that a formed cylindrical mounting port is provided, and a check valve is integrally provided at this mounting port . 2. The water meter according to claim 1, further comprising a pressure reducing valve provided between the meter housing and the water stopcock.