JPS598169Y2 - gas meter sliding valve - Google Patents

Description

[Detailed Description of the Invention] The present invention is configured to transmit the movement of the blade shaft in response to the expansion and contraction of the metering membrane to the sliding valve via a transmission mechanism, thereby causing the sliding valve to slide. The present invention relates to gas meters, and particularly to improvements in sliding valves for such gas meters.

The blade shaft is attached to the metering membrane stretched inside the metering membrane container body, and the swinging motion of the blade shaft is caused by the expansion and contraction of the metering membrane based on the intake and exhaust of gas into the metering chamber, which is controlled by the crank mechanism and gear train. On the one hand, it is transmitted to the integrating mechanism of the meter to display the integrated gas flow rate, and on the other hand, it is used as a rotational motion to drive the sliding valve that sucks and exhausts gas into the metering chamber. , gas meters configured to be transmitted to a sliding valve are known.

FIG. 1 is an external view showing an example of a sliding valve used in a known gas meter such as the one described above, where 1 is a sliding valve, and 2 is a sliding valve 1.
A groove 3 formed on the outer surface of the slide valve 1 is a valve seat that comes into sliding contact with the sliding surface of the slide valve 1.

In addition, a portion 4 indicated by a chain line is a rotating shaft connected to the transmission mechanism, 5 is a pin formed at the tip of the rotating shaft and rotatably holds the slide valve 1 from the outside, and 6 is a pin whose one end rotates. It is a crank lever that is fixed to a shaft 4 and whose other end engages with a groove 2 of a slide valve 1.

Therefore, the slide valve 1 is rotationally driven by the rotation of the crank lever 6.

FIG. 2 is a vertical cross-sectional view of FIG. 1, and 7 is a fan-shaped vent serving as a gas inlet, 8 is a closed fan-shaped space on the upper side symmetrical to the fan-shaped vent 7, and 9 is a connection between the vent 7 and the space 8. 10 is a central space portion located between the upper side and communicating with the space portion 8, and 10 is a pin 5;
The holes 11 and 12 are engaged with, and 11 and 12 are vent holes that serve as gas passages on the valve seat 3 side.

FIG. 3 is a bottom view of the sliding valve 1, and the portion 14 except for the vent hole 7 as a gas inlet and the vent hole 13 that connects to the spaces 8 and 9 and serves as a gas outlet is a flat sliding surface. .

FIG. 4 is a plan view of the valve seat 3, in which the ventilation hole 12 surrounded by the inner frame 15 and the part surrounded by the outer frame 16 are partitioned into four parts by partition ribs 17, each with a ventilation hole at an opposite position. 11 and a sealing portion 18 are formed.

Now, the surfaces of the sliding valve 1 and the valve seat 3 shown in FIGS. 3 and 4 are in close contact with each other, and the sliding valve 1 is rotated relative to the fixed valve seat 3. It is something.

Therefore, at this time, the rib 17 of the valve seat 3 comes into contact with the sliding surface 14 of the sliding valve 1 to maintain airtightness, but since the sliding surface 14 is wide, the sliding resistance becomes large.
The result was that the smooth sliding of the valve was obstructed.

However, since the sliding valve slides on the valve seat in response to part of the force of the expansion and contraction movement of the metering membrane in the metering chamber, the smooth movement of the sliding valve is affected by its wide sliding surface. If this is hindered by the large sliding resistance of the contact surface 14, it will become a cause of measurement errors.

The present invention was developed in order to solve this problem, and reduces the sliding resistance by forming a plurality of grooves on the sliding surface of the sliding valve of the gas meter. It is a smooth movement.

Further, according to the present invention, by forming such a groove on the sliding surface of the sliding valve, a gap is formed between the sliding valve and the valve seat to prevent gas from leaking. These grooves are formed with a width narrower than the width of the ribs on the valve seat, so that the ribs are always in sliding contact with some part of the sliding surface of the sliding valve to prevent gas leakage. .

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 5 shows a bottom view of the sliding valve according to the present invention, and corresponds to FIG. 3.

Therefore, in FIG. 5, the same parts as in FIG. 3 are given the same reference numerals.

According to the present invention, radially concave grooves 20 are formed on the sliding surface 14 of the sliding valve 1 in order to substantially reduce the area and reduce the sliding resistance. The width of the grooves 20 is approximately half the width of the rib 17 of the valve seat 3, and the distance between the grooves 20 is approximately equal.

In this way, as shown in the cross-sectional view in FIG. 6, the contact area between the sliding surface 14 of the sliding valve 1 and the rib 17 of the valve seat 3 is
It is about half that of the conventional one, and the sliding resistance is reduced by that amount, making the movement of the sliding valve smoother and reducing the load on the metering membrane.
It is possible to prevent measurement errors from occurring.

In addition, since the rib 17 of the valve seat 3 always makes sliding contact somewhere on the sliding surface 14 of the sliding valve 1, no gap is created, and therefore gas passing through the sliding valve leaks and causes measurement errors. Such things are also prevented.

It goes without saying that the present invention is not limited to a rotating slide valve, but can be similarly applied to a reciprocating slide valve 21 as shown in FIG.

That is, even in the valve 21 which has the ventilation L22 and the sliding surface 23 and which reciprocates toward the shaft 24, by forming concave grooves 25 in parallel in the direction perpendicular to the shaft 24, the valve (not shown) The contact area of the seat with the ribs is reduced, reducing sliding resistance.

As described above, according to the present invention, by forming a concave groove with a width narrower than the width of the rib of the valve seat on the sliding surface of the sliding valve, there is a gap between the sliding valve and the valve seat. Provided is a sliding valve for a gas meter that can reduce sliding resistance and perform smooth movement without causing gas leakage, and can prevent measurement errors from occurring.

It goes without saying that the present invention is not limited to the one embodiment described above, but can be implemented with various modifications without departing from the scope of the invention.

For example, the width and pitch of the grooves 20 may be made sufficiently narrower than the ribs 17 to form a large number of grooves.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a sliding valve, Fig. 2 is a vertical sectional view of Fig. 1, Fig. 3 is a bottom view of a conventional sliding valve, and Fig. 4 shows that the bottom surface of the sliding valve is a sliding valve. Fig. 5 is a plan view of the valve seat in contact with the valve seat, Fig. 5 is a bottom view showing an embodiment of the sliding valve according to the present invention, and Fig. 6 shows the state of contact between the sliding surface of the sliding valve and the rib of the valve seat. A sectional view shown for explanation and FIG. 7 is a perspective view showing another slide valve to which the present invention is applied. 1...Sliding valve, 3...Valve seat, 7...
...Vent (1 gas port), 10.11...
Vent hole (gas passage), 13...Vent hole (gas outlet), 14...Sliding surface, 17...Rib, 20...Groove.

Claims (1)

[Scope of utility model registration request] The valve seat, which is partitioned by ribs and has a gas passage formed therein, slides into airtight contact with the valve seat, and the movement of the blade axis in response to the contraction of the metering membrane is transmitted via the transmission mechanism, thereby causing the valve seat to In a sliding valve of a gas meter that slides along a sliding surface, a gas inlet and a gas outlet are formed, and at least the above-mentioned A gas meter sliding valve characterized by having a groove narrower than the width of the rib.