JPS623694Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a water supply system with a sub-pipe that measures the flow rate by installing a main meter in the main pipe and a sub-meter in the sub-pipe. Regarding meters.

In general, water meters with auxiliary pipes are equipped with a switching valve on the inlet side of a main meter installed in the main pipe, and a sub-meter is installed on the auxiliary pipe bypassed between the inlet side of the switching valve and the outlet side of the main meter. has been established. The switching valve is configured to close when the flow rate is small and allow tap water to flow only to the sub-meter, and on the other hand, when the flow rate exceeds a predetermined level, it opens due to the water pressure and allows the water to flow to the main meter.

Conventionally, this type of switching valve has specifically had a structure as shown in FIG. In the figure, 1 is a switching valve storage case, 2 is a filtration member, 3 is a valve box, and 4 is a switching valve storage case.
indicates the valve body. The switching valve storage case 1 has a tap water inlet 1a, a first outlet 1b leading to a sub-meter, and a second outlet 1c leading to a master meter. The valve box 3 is placed via a packing 6 on a support part 5 which is inside the switching valve storage case 1 and is divided into an inlet 1a side and a second outlet 1c side for tap water. The valve box has a cylindrical shape as a whole, and a small diameter part is provided at the lower part of the valve box, and the small diameter part is inserted into a through hole drilled in the support part 5. It is supported by the support part 5. The upper end of the valve box 3 is held down by a holding member 7, and the holding member and the support portion 5
It is fixed between. The filter member 2 is fixed to the lower part of the valve box 3 with screws 8.

Furthermore, a valve body 4 is inserted into the inside of the valve box 3 so as to be movable up and down. The valve body has a cylindrical shape as a whole, and a seat packing 9 is fixed to the lower surface of the valve body with a screw 11 via a presser plate 10, so that it comes into close contact with a stepped valve seat 3b provided at the lower inside of the valve body 3. ing.

Tap water flowing in from the inlet 1a of the switching valve storage case 1 passes through the filtration member 2, and when the flow rate is small, it flows from the first outlet 1b to the secondary meter;
When the flow rate is large, the valve body 4 is pushed up by water pressure, and the flow passes through the plurality of through holes 12 provided on the side surface of the valve box 3 and flows from the second outlet 1c to the main meter.

However, with conventional water meters with auxiliary pipes equipped with such switching valves, the sudden vertical movement of the valve body during high flow rates may cause the valve body to tilt and fit diagonally into the valve body, or to cause the valve body to become stuck in the valve body at an angle. In addition, the valve body and its gasket may become misaligned, worsening the sealing performance.As a result, when switching from the secondary meter to the main meter, the instrument error drops significantly, making it impossible to obtain accurate flow rate measurements. There was a problem. Furthermore, since conventional switching valves lack a structure for restricting the flow rate to the sub-meters, the sub-meters are overloaded when the flow rate is large, which is a major cause of failure.

Therefore, the purpose of the present invention is to eliminate these conventional drawbacks, operate the switching valve quickly and reliably, reduce the drop in instrumental error, and also make it possible to restrict the flow rate to the secondary meter when the flow rate is large. The object of the present invention is to provide a water meter with an auxiliary pipe that enables more accurate flow measurement.

The gist of the present invention is that a main meter installed in the main pipe, a switching valve installed on the outflow side of the main meter, and an auxiliary pipe interposed between the switching valve and the inflow side of the main meter. A water meter with an auxiliary pipe that is equipped with a secondary meter that is bypassed by the auxiliary pipe, and a valve body that is swingably attached at one end in a switching valve storage case and that has a water receiver at the other end, and a valve body that communicates with the auxiliary pipe and a pipe whose tip extends toward the water receiving portion of the valve body, a partition body is swingably attached to the tip opening of the pipe, and one end of the partition body is arranged so that tap water is A switching valve is provided, which extends through a passageway, attaches a weight to the other end of the partition body, and makes the weight contact the water receiving part, so that the tap water flowing through the main meter reaches a predetermined flow rate. Then, the water pressure pushes up the valve body and opens it.
As a result, a flow path for tap water from the main meter is formed, and the water receiving portion of the valve body pushes up the partition body through the weight, thereby causing the other end of the partition body to push up the pipe tip opening. The purpose is to restrict the inflow of tap water from the secondary meter by blocking it.

The features of the invention will become clearer from the following description of the illustrated embodiment.

FIG. 2 is a longitudinal cross-sectional view of the main meter, sub-meter, and switching valve.

In FIG. 2, reference numeral 20 is a main pipe, and the main pipe has a main meter 22 and a tap water outlet side 22.
A switching valve 24 is provided at a. A sub pipe 26 is connected between the switching valve and the inlet side 22b of the main meter 22.
is bypassed, and a sub-meter 28 is provided in the middle of the sub-pipe. The main meter 22 and the sub-meter 28 shown in FIG. 2 are mainly applied to cases of large flow rate and small flow rate, respectively, and their internal structures are well known and are not shown in the figure.

As shown in FIG. 3, the switching valve 24 consists of a switching valve storage case 30 and a switching valve main body 32 assembled within the case.

The switching valve storage case 30 is provided with an inlet 30a and an outlet 30b for tap water flowing into the interior through the main meter 22.

The switching valve storage case 30 has a shelf 36 formed in the center thereof and extending from the inlet 30a and outlet 30b sides so as to face each other at a distance 34 from each other. A switching valve main body 32 is assembled on the shelf. The switching valve body has a valve seat 40
and a valve body 42, which is disposed on the valve seat 40 with a gasket 44 in between, and the gasket 44 is attached to the valve body 42 with a set screw 45a via a retaining plate 45. The valve seat is press-fitted into the edge of the stepped shelf 36.

The valve body 42 is connected to the valve seat 4 at one end 42a thereof.
4 (not shown).
That is, the valve body 42 is swingably attached by inserting a pin 46 as a pair into a through hole provided at one end 42a. On the other hand, the other end 42b of the valve body 42 is provided with a switching valve storage case 30.
A water receptacle 48 that projects upward is provided.

Above the switching valve storage case 30, there is a secondary meter 2.
8 and the switching valve 24 are connected to the sub-pipe 26. A pipe 52 that liquid-tightly penetrates a through hole provided in the switching valve storage case 30 and extends into the switching valve storage case 30 is connected to the tip of the extraction pipe. The pipe is bent near its tip 52a, and the tip 52a extends toward the water receiving portion 48 of the valve body 42.

As shown in FIG. 3, the tip 52a of the pipe 52 has a mounting portion 54 on the outlet 30b side of the switching valve storage case 30, to which a partition 56 is attached. A pin hole (not shown) is provided in the center of the mounting portion 54 and the partition body 56, and a pin 58 is inserted into the pin hole as a pair, and the partition body 5
6 is attached so as to be swingable about a pin 58 as a central axis. One end 56a of the partition 56 is formed by extending and bending along the inner peripheral surface near the tip 52a of the pipe 52, that is, opening a passage for tap water. On the other hand, a weight 60 is attached to the other end 56b of the partition 56. The weight is in contact with the upper surface of the water receiving portion 48 of the valve body 42 due to its own weight.

Next, the operation of the water meter with auxiliary pipe according to the present invention having such a configuration will be explained.

First, when tap water is gradually supplied from the main pipe 20, this tap water passes through the main meter 22 and enters the switching valve 24 from the inlet 30a of the switching valve storage case 30.
At the same time, the inlet side 2 of the main meter 22
Sub-meter 2 via sub-pipe 26 branched from 2a
8 into the switching valve 24 from the pipe 52 as well. The tap water flowing from this child meter 28 is
As shown by the arrow in the figure, the tip 52a of the pipe 52
The water flows out from the opening portion 52b toward the water receiving portion 48 of the valve body 42, and at the same time flows out from the outflow port 30a. In this case, the partition 56 opens a passage for tap water. Further, at this time, since the flow rate of tap water is small, the valve body 42 is closed by its own weight and the pressure caused by the jet flow from the pipe 52. Therefore, the tap water in the main meter 22 does not flow, that is, the impeller (not shown) in the main meter 22 remains stationary without rotating. Therefore, the tap water supplied from the main pipe 20 flows only into the secondary meter 28, and only this secondary meter operates, thereby measuring the flow rate.

On the other hand, when the flow rate gradually increases from the main pipe 20 and reaches a predetermined flow rate, a pressure loss is caused by the sub meter 28, and the pressure of the tap water flowing from the main meter 22 into the switching valve 24 through the inlet 30a is reduced. increases, and this water pressure increases the weight of the valve body 42 and the pipe 5.
The valve element 42 is pushed up by overcoming the pressure of the jet flow from the main meter 22 and the switching valve 24, thereby opening the valve element 42 and forming a flow path. , and later flows out from the outlet 30b. In this case, when opening the valve body 42,
At the same time as the valve body 42 is pushed up by water pressure,
The partition body 56 that was in contact with the water receiving part 48 of the valve body
is pushed up by the valve body 46 via the weight 60, that is, the partition body 56 rotates around the pin 58, and later the tip portion of one end 56a of the partition body hits the inner peripheral surface of the pipe 52, causing the pipe to open. Opening part 5
2b to restrict the inflow of tap water from the secondary meter 28. In this way, in the case of a large flow rate, the flow rate is measured by mainly operating the main meter 22 while limiting the flow rate from the slave meter 28.

FIG. 4 is a graph showing the instrumental error performance in comparison with a conventional water meter with auxiliary pipes, based on the results of experiments conducted using the water meter with auxiliary pipes according to the present invention. As this graph shows, when switching from a child meter to a parent meter, conventional water meters experience a drop of approximately -20%.
The present invention shows only a slight drop, indicating that its instrumental error performance is excellent.

As shown in FIG. 3, a convex portion is provided on the other end 42b of the valve body 42 to serve as a water receiving portion 48, and furthermore, the convex portion is provided to act as a weight when the valve body 42 is opened. One end 42a of the valve body 42
This ensures the desired self-weight of the valve body 42 and reduces the cost by molding the valve body 42 into a smaller size as a whole. The valve body 42 may be provided further away from the pin support position, and the thin portion of the valve body 42 excluding the convex portion may be increased.

Therefore, according to the present invention, since the switching valve in which the valve body is moved up and down is improved and made into a so-called swing type, the switching of the flow path can be done quickly and reliably, and the drop in instrumental error during switching can be reduced. This makes it possible to make more accurate flow measurements.

Furthermore, according to the present invention, since the partition is provided at the tip opening of the pipe, the inflow of tap water from the secondary meter can be restricted appropriately and quickly.
It is possible to prevent failure of the secondary meter due to overload during large flow rates, and further promote the effect of preventing the instrumental error from falling.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a switching valve in a conventional water meter with auxiliary pipe, Fig. 2 is a plan view showing a water meter with auxiliary pipe according to the present invention, and Fig. 3 is a switching valve shown in Fig. 2. FIG. 4 is a graph showing the instrumental error performance of the water meter with auxiliary pipe according to the present invention in comparison with the conventional water meter. 20...Main pipe, 22...Main meter, 24...Switching valve, 26...Sub-pipe, 28...Sub meter, 30...
...Switching valve storage case, 42...Valve body, 48...Water receiver, 52...Pipe, 52a...Pipe tip, 52b...Opening part of pipe tip, 56...
Partition body, 60... weight.

Claims (1)

[Scope of utility model registration request] A water meter with a secondary pipe includes a parent meter installed on a main pipe, a switching valve installed on the outlet side of the parent meter, and a child meter bypassed between the switching valve and the inlet side of the parent meter via a secondary pipe, the water meter with a secondary pipe comprising: a valve body having one end swingably attached within a switching valve storage case and a water receiving portion at the other end; a pipe communicating with the secondary pipe and having a tip extending toward the water receiving portion of the valve body, a partition body swingably attached to the tip opening of the pipe, one end of the partition body extending within the tip opening of the pipe to open a passage for tap water, and a weight attached to the other end of the partition body with the weight abutting against the water receiving portion.