JPS5930421Y2 - Excess flow indicator - Google Patents

Description

[Detailed description of the invention] This invention mainly relates to an excess flow rate indicator that is attached to the gas meter of a large city gas consumer and indicates when the instantaneous flow rate exceeds the contracted flow rate.

The purpose of this invention is to provide an impeller that is rotated by the gas ejected from the low pressure chamber and the high pressure chamber in the casing body, which is connected to the differential pressure generation mechanism provided in the outlet pipe of the gas meter body. An object of the present invention is to provide an excess flow rate indicator capable of reliably displaying an excess flow rate by activating an indicator by centrifugal force when the rotation of the impeller reaches a predetermined number of revolutions or more due to pressure fluctuations with the low pressure chamber. It is.

This invention will be explained below with reference to one embodiment shown in the drawings.

1 in Fig. 1 is a gas meter main body, into which gas whose flow rate is to be measured is introduced via an inlet pipe 2, measured in a measuring chamber (not shown), and after indicating the cumulative flow rate, the gas is introduced into the main body 1 through an outlet pipe. 3.

A differential pressure generating mechanism 4 is connected to this outlet pipe 3 as shown in FIG.

The connecting parts 5, 5 of this differential pressure generating mechanism 4 have an opening 7 for the total pressure transmitted via the total pressure pipe 6 and a small vent lily 8.
An opening 11 for receiving dynamic pressure transmitted through a through hole 10 provided in the throat portion 9 is open.

Therefore, the high pressure connecting pipe 1 is provided in the opening 7 for the total pressure.
2 is connected at one end, and the other end is connected to the inlet 14 of the excess flow indicator 13 of this invention.

In addition, a low pressure connecting pipe 15 is provided in the opening 11 for the dynamic pressure.
One end is connected, and the other end is connected to the dynamic pressure port 16 of the excess flow indicator 13.

Next, the excess flow rate indicator 13 will be explained in detail.

In FIGS. 3 and 4, reference numeral 11 denotes a casing body having an opening 18 at one end, and a lid 20 is provided in this opening 18 with a partition plate 19 interposed therebetween.

Therefore, the inside of the casing body 17 is divided into a high pressure chamber 21 and a low pressure chamber 22 by the partition plate 19.

The high pressure chamber 21 communicates with the above-mentioned population 14, and the low pressure chamber 22 communicates with the dynamic mold 16 via a through hole 23 penetrating the partition plate 19.

Furthermore, the partition plate 19 is provided with the gas in the high pressure chamber 21 to the low pressure chamber 2.
A plurality of nozzles 24, 24 are drilled to eject water into the low pressure chamber 2, and the low pressure chamber 2 faces the nozzles 24, 24.
A centrifugal actuation mechanism 25 is provided within 2.

Next, the centrifugal actuation mechanism 25 will be described in detail. Reference numeral 26 denotes a mounting plate supported by a plurality of supports 27 on the partition plate 19, and the central part of the mounting plate 26 and the partition plate 19
Bearings 28, 28 facing each other are provided in the central part of the bearing.

A rotary shaft 29 is rotatably supported between these bearings 28 and 28.

This rotary shaft 29 is close to the partition plate 19 and has a nozzle 2.
4.24 and a guide shaft 31.3 that is close to the impeller 30 and the mounting plate 26 and extends in a direction orthogonal to the rotating shaft 29.
1 is provided.

The impeller 30 and the guide shafts 31 and 31 are configured to rotate together with the rotating shaft 29.

Furthermore, sliders 32.32 that are slidable in the axial direction are fitted into the guide shafts 31.31, and these sliders 32.32 are provided at the tips of the guide shafts 31.31.
Spring 34.34 interposed between 33.33
is biased in the direction of the rotating shaft 29.

Further, a support plate 36 is attached to the mounting plate 26 by struts 35, 35, and a rotation shaft 37 is rotatably supported between the support plate 36 and the mounting plate 26.

An actuating piece 38 and a display body 39 are fixed to the rotating shaft 37, and the actuating piece 38 passes through a long hole 40 formed in the mounting plate 26 and follows the rotation locus of the movers 32, 32. It is located in

Further, the display body 39 is bent into an L-shape, and a display portion 39a at one end thereof faces a display window 41 provided on the front surface of the casing body 17, and the other end is interlocked with a manual return mechanism 42. .

Further, magnets 43, 43 are spaced apart from each other on both sides of the actuating piece 38, and when the actuating piece 38 comes into contact with the slider 32 and rotates, the actuating piece 38 is attracted and held. There is.

Next, the operation of the above embodiment will be explained.

When gas below a certain value flows into the gas meter body 1, the total pressure of the gas flowing into all main pipes 6 of the differential pressure generating mechanism 4 is transferred to the high pressure chamber of the excess flow indicator 13 via the high pressure connecting pipe 12. 21 and flowing into the through hole 10 provided in the throat portion 9 of the small bench lily 8 enters the low pressure chamber 22 from the dynamic pressure port 16 via the low pressure connecting pipe 15.

In this way, when gas below a certain value is flowing, the gas in the high pressure chamber 21 is ejected from the nozzle 24.24 into the low pressure chamber 22, so the impeller 30 rotates at a low speed, and this rotation The rotation is transmitted to the guide shafts 31, 31 via the shaft 29 and rotates together with the guide shafts 31,31.

However, the slider 32 supported on the guide shaft 31.31
．． 32 is biased inwardly, that is, in the direction of the rotating shaft 29 by the spring 34.
does not come into contact with the actuating piece 38 and remains stationary.

However, when a gas above a certain value is used and the differential pressure between the total pressure and the dynamic pressure increases, the gas ejection pressure from the nozzles 24, 24 increases.

Therefore, the impeller 30 rotates at high speed, and the guide shafts 31 and 31 rotate together at high speed via the rotating shaft 29.

Therefore, the slider 32.32 moves outward due to the centrifugal force that overcomes the spring 34.34, and when it moves to the position shown by the broken line in FIG.
comes into contact with.

When the actuating piece 38 comes into contact with the mover 32.32, the actuating piece 3
8 is pressed in the rotational direction of the movers 32, 32, and the actuating piece 3
8 rotates together with the rotation shaft 37.

Accordingly, the display body 39 fixed to the rotation shaft 37 also rotates, and its display portion 39a faces the display window 41 to display that the gas flow rate has exceeded the fixed value by one point.

In this manner, once the actuating piece 38 is rotationally displaced by the mover 32, 32, it is attracted by the magnet 43 and held in that state, and will not return due to vibration or the like.

As explained above, this idea has an impeller that is rotated by the gas ejected from the high pressure chamber in the low pressure chamber inside the casing body, which is connected to the differential pressure generation mechanism provided in the outlet pipe of the gas meter body, and the high pressure chamber and low pressure chamber When the rotation of the rotary wheel of the impeller reaches a predetermined number of revolutions or more due to pressure fluctuations, the indicator is activated by centrifugal force, so that the indicator will operate reliably when the instantaneous flow rate exceeds a certain level. This has the effect of making it easy to confirm whether or not there is an excess flow rate.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; Fig. 1 is a front view of the gas meter installed, Fig. 2 is a cross-sectional view of the differential pressure generating mechanism, Fig. 3 is a cross-sectional view of the excess flow indicator, FIG. 4 is also a partial sectional view. 1... Gas meter body, 3... Outlet pipe, 4... Differential pressure generation mechanism, 17... Casing body, 19... Partition Board, 21...
・High pressure chamber, 22...Low pressure chamber, 25...
Centrifugal actuation mechanism, 30... Impeller, 39...
...Display body.

Claims (1)

[Scope of utility model registration request] A high-pressure chamber is connected to a differential pressure generating mechanism installed in the outlet pipe of the gas meter body, introduces the total gas pressure and dynamic pressure, and indicates an excess flow rate based on the differential pressure. and a low-pressure chamber, and an impeller that is rotated by the gas ejected from the high-pressure chamber is provided in the low-pressure chamber, and the impeller is linked to the impeller so that the rotation of the impeller is rotated at a predetermined rotation rate due to pressure fluctuations between the high-pressure chamber and the low-pressure chamber. An excess flow indicator characterized by being equipped with a centrifugal actuation mechanism that actuates an indicator by centrifugal force when the excess flow rate exceeds the specified limit.