JPS6330978Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a so-called dry gas meter.

Dry gas meters have recently become more compact, and in order to reduce the volume per cycle and increase the number of revolutions, a plate-shaped diaphragm with low resistance has come to be used as a measuring membrane. However, in the case of a diaphragm membrane, as the flow rate increases, the diaphragm inside the metering chamber is caused by a pressure difference, which causes the inflator difference to tend to be negative, that is, the difference to the right goes down. It has been found that in order to prevent the instrument error from falling to the right, it is sufficient to give the valve an advance angle that allows the valve to open and close quickly. The present invention attempts to provide this instrumental difference matching device with a simple structure.

First, to explain the conventional gas meter shown in Fig. 1, 1 and 1' are blade axes (the numeral '' indicates approximately symmetrical parts and hereinafter some symmetrical parts may be omitted from illustration), and 2 and 2' are the blade axes. The wing shafts 1, 1' are moved by the reciprocating movement of the membrane in the metering chamber using an armrest whose one end is fixed to the wing shaft.
make an angular reciprocating motion through. 3, 3' is elbow metal 2,
2', one end of which is connected to the crank rod via free joints 4, 4', and the other end is connected to the crank pin 5,
5' to the crank arms 6, 6'. Reference numeral 7 denotes a crankshaft fixed to the base of the crank arms 6, 6'. This crankshaft 7 is given rotational motion by the crank arms 6, 6', and the circular motion of this shaft 7 is controlled by an integrating device (not shown). will be accumulated. In addition, 8, 8' are valve arms, and one end is the armrest 2,
2' and the other end is the valve 9, and the pin 10 is connected to 9', respectively.
It is attached by 11. Numeral 12 is a push nut that prevents valve arms 8 and 8' from coming out. 13 is a valve seat, and 14 is a guide bar.

In the above device, the strokes of the crank rods 3, 3', armrests 2, 2', wing shafts 1, 1', and diaphragm are limited by the rotation radius R of the crank arms 6, 6'. When the arm 6 is at a position making an angle of approximately 90 degrees with the dead center, the valve 9 is in a position where all openings of the valve seat 13 are closed. Valve 9' side (not shown)
It is in the most open position.

The present invention improves the crank rods 3, 3' and the crankshafts 7, 7' to give the valve a forward angle, so that the valve opens and closes before the crank arms 6, 6' reach a position approximately 90 degrees from the dead center. This is what I did.

For such purposes, the crank arm 6,
The present applicant proposed an improved structure for the connection between the crank rod 6' and the crank rods 3 and 3' in Utility Model Publication No. 45300/1983, but the present invention attempts to propose a simpler structure for the same purpose. It is.

2 to 5 showing an embodiment of the present invention, the general structure is the same as the explanation in FIG. 1, but conventionally the movement of the valves 9, 9' is
However, in the present invention, the crank rods 3, 3' were improved and the free joints 4, 3' were driven.
Arms 4a and 4a' are extended around point 4', and valves 9 and 9' are driven at a radius α of the arms 4a and 4a'. When the crank arm 6 is perpendicular to the crankshaft 7, the valve drive pin 10a is advanced by an amount A with respect to the center line of the blade shaft 1, and the valve 9 opens and closes earlier by an amount B.

Also, if the crank arm 6 is perpendicular to the bottom of the crankshaft 7 as shown in Fig. 3, the valve drive pin 10a
is advanced by C with respect to the center line of the blade axis 1, and the valve 9 opens and closes earlier by D.

The same goes for the valve on the opposite side (see Fig. 4), but a crank gear 15 is fixed to the crankshaft 7, and this gear 15 meshes with a crank gear 15' on the crankshaft 7' on the opposite side. , and in turn, the same movement is made via the crankshaft 7', although there is a phase difference. The rotation of the crankshaft 7 can be appropriately transmitted to the integrating device. This structure makes it possible to prevent the negative tendency of instrumental error, which has been a drawback of the prior art.

It goes without saying that the design of each component can be modified as appropriate within the scope of achieving the above functions.

As described above, in the present invention, small arms 4a, 4a' are provided at the base of the crank rods 3, 3', and the valves are driven by the tips of the arms, and the valve opening/closing is advanced using a simple structure that only involves interlocking the left and right crankshafts. Since the corners can be easily provided, a structure that is simple and advantageous in manufacturing and handling can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view of the interlocking mechanism of a conventional dry gas meter, Figs. 4 is a plan view of the interlocking portion, and FIG. 5 is a side view of FIG. 4. 1, 1'... wing shaft, 2, 2'... elbow metal, 3, 3'
...Crank rod, 4,4'...Free joint, 4
a, 4a'...arm, 5,5'...crank pin, 6,
6'...Crank arm, 7,7'...Crankshaft, 8,8'...Valve rod, 9,9'...Valve, 10a, 10a'...Drive pin, 10,11...
...Pin, 13...Valve seat.

Claims (1)

[Scope of utility model registration request] The left and right wing shafts 1, 1' of the dry gas meter are provided with crank rods 3, 3' which are driven via free joints 4, 4', respectively, and the crank shaft 7 is connected via crank arms 6, 6' connected to the ends of the crank rods 3, 3'. ，
7', the crankshafts 7,
Gears 15, 15' are arranged in parallel and interlock with each other, and arms 4a, 4a' ends are provided at the bases of the crank rods 3, 3' for driving the valve rods 8, 8'. provided, the arms 4a, 4
A gas meter characterized in that driving pins 10a, 10a' provided at ends a' are connected to valve rods 8, 8' at proper operating positions.