JP2001021404A - Water meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate work such as pipe connection and meter exhange. SOLUTION: This water meter consists of a meter housing 1 accommodating detachably a measuring mechanism 2, and a cap 3 watertightly sealing the meter housing 1. In the meter housing 1, a water stopping valve 4 is collectively arranged on the primary side, and a check valve 5 is collectively arranged on the secondary side. An attaching port 9 accommodating detachably the check valve 5 is slantingly installed on the secondary side of the meter housing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a water meter.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a general piping of a water meter according to the prior art. Reference numeral 11 denotes a water meter connected to a water pipe. A check valve 13 is connected to the next side, respectively. 14
14 is a pipe end corrosion-resistant joint.

When the plumbing work is completed in a dwelling unit or the like, a water flow test must be performed. At this time, in order to prevent the water meter from being added, the water meter is conventionally removed from the water pipe, and instead, the water meter is directly replaced. The pipe was connected to conduct a water flow test.

[0004]

As described above, the water meter 11 conventionally connected at the time of the water flow test is once removed, a straight pipe is disposed at the connection portion, and after the water flow test is completed, the straight pipe is removed. Since the operation of attaching the water meter 11 again was performed, the series of operations was very troublesome. In particular, 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 a straight pipe with a water meter.

Further, the water meter is required to be replaced periodically (once every eight years) by the law (measurement law). Even when such a meter is replaced, the old water meter is removed and the new water meter is attached. This was very time-consuming, as was the replacement work from the straight pipe described above.

Incidentally, 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 that opens and closes the valve by the flow of water, the check valve 13 is conventionally connected horizontally to the water meter 11 as shown in FIG. Therefore, when it becomes necessary to replace the check valve 13 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 is a very laborious work like the replacement work of the water meter described in the related art.

Conventionally, since the water meter, the water stopcock and the check valve are all separate bodies, they must be connected in order at the time of piping work, and there is a problem that the number of works is large.

The present invention has been made based on the above-mentioned problem, and an object of the present invention is to provide a water meter capable of easily performing operations such as pipe connection and meter replacement.

[0009]

In order to achieve the above object, the present invention comprises a meter housing for detachably housing a metering mechanism, and a cap for sealing the meter housing in a watertight manner. A water stopcock is provided on the primary side, and a check valve is provided integrally on the secondary side, and a means is adopted in which the meter housing, the water stopcock, and the check valve are unitized as one member. Here, it is a matter of course that each end of the water stopcock and the check valve has a joint connectable to a pipe. 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. If a cap is attached with the measuring mechanism removed, it functions as a straight pipe during the water flow test.

[0010] In the second aspect, means for selectively providing an inclined mounting port for detachably receiving the check valve on the secondary side of the meter housing is used. According to this means, it is possible to replace the check valve while the pipe is connected. In addition, replacement work can be easily performed. The angle of inclination of the attachment port is set so that the attached check valve can be opened by the water flow from the primary side, and can be closed when there is no water flow or when a reverse flow from the secondary side occurs. Set.

According to a third aspect of the present invention, a means for providing a pressure reducing valve between the meter housing and the water stopcock is employed.

[0012]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a water meter showing a first embodiment, wherein 1 is a meter housing for accommodating the metering mechanism 2 shown in FIG. 2, 3 is a cap that can be screwed into the meter housing 1, and 4 is a meter. A water stopcock 5 provided integrally on the primary side of the housing 1 is a check valve provided integrally on the secondary side of the meter housing 1.
In addition, 6.6 is a joint connectable to a water pipe.

The meter housing 1 is formed with a flange 1a for partitioning the inside up and down, and water flows in the direction of the arrow through a water passage 1b. Meter housing 1 of this structure
The cap 3 is screwed through a packing 7 and a transparent plate 8 made of plastic or glass in a state in which the measuring mechanism 2 is fitted into the apparatus and the step 2a of the measuring mechanism 2 is placed on the flange 1a. The mechanism 2 can be sealed to the meter housing 1 in a watertight manner. Then, the water meter is confirmed by opening the lid 2b provided on the cap 2 and passing through the glass plate 8. The weighing mechanism 2 can adopt, for example, a tangential flow impeller type mechanism. An impeller is provided below the step portion 2a, and a rectifying plate, a pointer, and the like are provided above the step portion 2a.

On the other hand, at the time of the water flow test, the meter housing 1 is kept watertight by simply screwing the cap 3 without fitting the metering mechanism 2 into the meter housing 1, and the flow path is formed by the water flow path 1b. Therefore, the water meter of the present invention functions as a straight pipe. When the meter is replaced, the cap 3 is removed, and the meter housing 1 is replaced with a new weighing mechanism 2, whereby the replacement operation is completed.

As described above, the water meter of the present invention is provided with the meter housing 1 to which the measuring mechanism 2 is detachable, and the meter housing 1 is sealed with the cap 3 in a water-tight manner. If this is the case, a water flow test and meter replacement can be performed in the connected state.

On the other hand, in the water meter according to the present embodiment, the check valve 5 is attached to the cylindrical mounting port 9 formed at a predetermined inclination angle (60 degrees in the present embodiment) on the secondary side of the meter housing 1. It is housed detachably. The mounting port 9 has a female screw 9a screwed with a male screw 5a provided on the outer periphery of the valve box of the check valve 5 inside thereof, and has a contact step 9b for supporting a lower end of the check valve 5 and mounting. Water enters through the lower opening 9c of the mouth 9 and passes through the lateral opening 9d to the secondary side.

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

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

In the present embodiment, the water stopcock 4 is also provided integrally with the primary side of the meter housing 1. When the metering mechanism 2 and the check valve 5 are replaced, the water is stopped by operating the knob 4a. Can be. That is, the water meter of 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, 6 are unitized into one unit, and this can be connected to the pipe as one member. it can.

FIG. 3 shows a second embodiment, in which a pressure reducing valve 10 is provided integrally between the meter housing 1 and the water stopcock 4. In other words, the water supply pressure is adjusted by turning 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 in which a water tower is installed on the roof, the pressure of the water supplied to each house increases as the floor is lower, and a problem such as occurrence of water hammer is likely to occur due to the excessive pressure of the water supply. By providing the pressure reducing valve 10, the water supply pressure on the lower floor can be reduced to be appropriate.

[0021]

As described above, according to the present invention, the piping of the water meter, the water stopcock and the check valve is completed only by connecting the two places at the ends, and the number of piping operations can be greatly reduced. Was completed. In addition, since the meter housing for detachably housing the metering mechanism is provided, it is possible to replace the metering mechanism in a state where the pipes are connected, and it is not necessary to separate the water meter itself from the pipes as in the related art, making the replacement work extremely difficult. It can be done easily. In addition, if the measuring mechanism is removed and the cap is sealed, the water meter of the present invention functions as a straight pipe, so that the replacement work between the straight pipe and the water meter as in the conventional case is unnecessary, and the piping work itself is simplified. Can be

In the case where the check valve is detachable from a mounting port provided on the secondary side of the meter housing, the check valve can be replaced while the water meter is connected to the pipe. Furthermore, since the mounting port is provided at an angle,
Tool operation is easy even in a small meter box,
The check valve can be easily replaced. Furthermore, in the case where a pressure reducing valve is provided between the meter housing and the water stopcock, the excessive water supply pressure can be reduced to make it appropriate.

[Brief description of the drawings]

FIG. 1 is a longitudinal 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 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]

 DESCRIPTION OF SYMBOLS 1 Meter housing 2 Metering mechanism 3 Cap 4 Stopcock 5 Check valve 6 Joint 7 Packing 8 Transparent plate 9 Check valve mounting port 10 Pressure reducing valve

Claims (3)

[Claims] The meter housing includes a meter housing for detachably accommodating a metering mechanism, and a cap for sealing the meter housing in a watertight manner. A water meter, characterized in that a check valve is integrally provided on the side. 2. The water meter according to claim 1, wherein a mounting port for removably receiving the check valve is provided on a secondary side of the meter housing. 3. The water meter according to claim 1, wherein a pressure reducing valve is provided between the meter housing and the water stopcock.