CN115112193A - Rotary valve gas switching and distributing device for diaphragm gas meter - Google Patents

Abstract

A rotary valve gas switching and distributing device for a diaphragm gas meter belongs to the technical field of metering instruments and comprises a valve cover and a valve seat. The valve seat comprises a shaft seat ring and an outer annular barrier, and the outer annular barrier is connected with the shaft seat ring through a plurality of inclined barrier ribs to divide a plurality of valve seat air inlets. The valve cover is arranged on the central shaft of the shaft seat ring. The air inlet of the valve cover is matched and corresponding to the air inlet of the valve seat. The advance angle of the air inlet of the valve cover is provided with a notch of the valve cover. The valve gap is at the pivoted in-process, and dust and/or impurity will slide to the slope lower limb that the slope separates the muscle along with the rotation of valve gap, has the valve gap, and when a cavity volume below the valve gap air inlet was about to reach the maximum value, the valve gap breach can guide the air current to ventilate in advance to next cavity, and the cavity that is about to reach the maximum volume is just restricted, can not appear very big negative deviation.

Description

Rotary valve gas switching and distributing device for diaphragm gas meter

Technical Field

The invention belongs to the technical field of metering instruments, and particularly relates to a rotary valve gas switching and distributing device for a membrane type gas meter.

Background

The mainstream gas meter in the current market is a membrane gas meter. The valve cover and the valve seat are important parts of the diaphragm gas meter. When the diaphragm gas meter works, the airflow of the cavity pushes the external link mechanism, the valve cover rotates on the valve seat under the driving of the link mechanism, the diaphragm gas meter continuously changes the gas inlet and the gas outlet channel, the gas is fed into the cavity for metering, and the gas in the cavity needs to be discharged to the gas outlet channel, and the gas cannot leak in the gas inlet and the gas outlet channel of the diaphragm gas meter in the working process, so that the contact surface between the valve cover and the valve seat is required to be smooth and always kept smooth to ensure that the valve cover can not leave the valve seat and can continuously rotate in the continuous rotating process.

The center line of the spacer rib on the valve seat of the diaphragm gas meter in the market at present is through the center of the valve seat, and the straight spacer rib does not move relatively at the same point in the rotating process of the valve cover, so that some dust and/or impurities are easily accumulated on the spacer rib, when the dust and/or impurities are accumulated more and more, the edge of the contact surface between the valve cover and the valve seat is protruded, the resistance of the valve cover in the rotating process is increased, and a larger gap is generated between the valve cover and the valve seat.

Disclosure of Invention

The invention aims to provide a rotary valve gas switching and distributing device for a diaphragm gas meter, which can ensure that a valve cover can not leave a valve seat and can keep a good contact sliding state in continuous rotation.

The technical scheme is as follows:

a rotary valve gas switching and distributing device for a diaphragm gas meter comprises a valve cover and a valve seat. The method is characterized in that:

the valve seat comprises a shaft seat ring and an outer annular barrier, and the outer annular barrier is connected with the shaft seat ring through a plurality of inclined barrier ribs to divide a plurality of valve seat air inlets.

The center of the shaft seat ring is provided with a central shaft.

The center of the valve cover is arranged on the central shaft.

The valve cover air inlet of the valve cover is matched and corresponding to the valve seat air inlet.

And a valve cover notch is arranged on the advance angle of the valve cover air inlet.

The advantages are that:

when the valve seat adopts the design of the inclined spacer rib, the accumulation of dust and/or impurities can be reduced, when the valve cover rotates, the valve cover and the valve seat can generate relative motion, according to a linear velocity formula V, the linear velocity of each point on a tangent line is different, but the same point velocity of the original straight spacer rib is the same, the dust and/or impurities are easy to accumulate, and the same point of the inclined spacer rib can also generate radial relative motion in the continuous rotating process, so that the dust and/or impurities can slide to the lower edge of the inclined surface of the inclined spacer rib at one point along with the rotation of the valve cover and slide along with gas, the dust and/or impurities cannot be accumulated, the contact surface between the valve cover and the valve seat is relatively smooth, and a good sliding contact state is ensured.

The valve cover is provided with a valve cover notch, when the volume of a cavity below the air inlet of the valve cover is about to reach the maximum value, the valve cover notch can guide airflow to the next cavity, namely the second cavity is ventilated in advance, and the rest can be done in the same way, so that the pressure is balanced, the cavity about to reach the maximum volume is limited, and the volume is not increased any more. If the metering volume is too large, the error value of large flow rate will have large negative deviation, the curve difference of the error curve is enlarged, the gap of the valve cover is increased to effectively control the phenomenon of too large volume, and the adjustment function is played for improving the error value. The diaphragm gas meter comprises a core body, a cavity, a link mechanism and a gas outlet channel part which are known technologies.

This device reasonable in design simple to operate need not to do great change in current diaphragm type gas table structure and can realize this function, and the practicality is strong.

Drawings

Fig. 1 is a top view of the present valve cover.

Fig. 2 is a schematic perspective view of fig. 1.

Fig. 3 is a top view of the present valve seat and core body.

Fig. 4 is a partial schematic view of the oblique spacer.

Fig. 5 is a top view of the interaction of the valve seat and valve cover.

FIG. 6 is a front view of the interaction of the valve seat and valve cover.

The valve cover comprises a valve cover 1, a valve seat 2, a machine core body 3, an inner annular barrier 4, an intermediate annular barrier 5, an outer annular barrier 6, inclined barrier ribs 7, a valve seat air inlet 8, reinforcing ribs 9, a valve cover air inlet 10, a valve cover gap 11, an air outlet channel 12 and a shaft seat ring 13.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and parts not described in the present invention are all related art or standard products, and are not described again.

A rotary valve gas switching and distributing device for a diaphragm gas meter comprises a valve cover 1 and a valve seat 2.

As shown in fig. 3 and 4: the valve seat 2 is fixedly arranged on the machine core body 3, the valve seat 2 comprises a shaft seat ring 13 and an outer annular barrier 6, the outer annular barrier 6 and the shaft seat ring 13 are connected through a plurality of inclined barrier ribs 7 to divide a plurality of valve seat air inlets 8, in the embodiment, the four inclined barrier ribs 7 evenly divide four valve seat air inlets 8 on the circumference.

The upper edge of the shaft race 13, the upper edge of the inclined spacer 7 and the upper edge of the outer annular barrier 6 are level. The plurality of oblique ribs 7 form a structure like a plurality of blades on the circumference.

The shaft race 13 is circular. The outer annular barrier 6 is circular.

The shaft race 13 comprises a middle annular barrier 5 and an inner annular barrier 4, a closed structure is arranged between the middle annular barrier 5 and the inner annular barrier 4, the closed structure is provided with a bottom sealing plate, a plurality of reinforcing ribs 9 are arranged in the radius direction of the upper layer, the number of the reinforcing ribs is three in the embodiment, and the reinforcing ribs are uniformly arranged on the circumference.

The center of the inner annular grid 4 is provided with a central shaft, namely the center of the shaft race 13 is provided with a central shaft.

The middle annular barrier 5 and the inner annular barrier 4 are both circular rings.

As shown in fig. 5 and 6: the valve cover 1 is centrally arranged on said central shaft and can rotate freely above the valve seat 2. The valve cover 1 is round, and the bottom surface is a plane.

As shown in fig. 1 and 2: the shape, size and angle of the valve cover air inlet 10 of the valve cover 1 correspond to the shape, size and angle of the valve seat air inlet 8 formed by dividing the upper edge of the inclined partition rib 7 of the valve seat 2 in a matching way, so that the function of dividing different valve seat air inlets 8 into different cavities of the diaphragm gas meter can be achieved.

The upper edge of the inclined spacer 7 is contacted with the lower end surface of the valve cover 1.

A valve cover notch 11 is arranged on the advance angle of the valve cover air inlet 10. When the valve cover air inlet 10 is aligned with a cavity below, the valve cover gap 11 is aligned with an area of the next cavity in advance, and the valve cover gap 11 can be in other shapes as long as the valve cover gap can be aligned with an area of the next cavity in advance.

Furthermore, the gas facing surface of the inclined spacer 7 is opposite to the rotation direction of the valve seat 2.

Further, as shown in fig. 1, an extension line of the leading edge of the valve cover air inlet 10 intersects a radius MN, an angle a between the edge of the valve cover notch 11 and the radius MN is 10 ° to 45 °, and a position of an edge vertex C of the valve cover notch 11 is not particularly limited.

Further, the oblique spacer 7 may be shaped like a triangle in a plan view, as shown in fig. 3.

Further, the inner edge of the inclined spacer 7 is vertically and fixedly connected to the outer surface of the shaft race 13, that is, the outer surface of the middle annular barrier 5, the outer edge of the inclined spacer 7 is fixedly connected to the inner ring of the outer annular barrier 6, and the upper point and the lower point of the outer edge of the inclined spacer 7 are staggered. As shown in fig. 4.

The angle a may in particular be 10 °, 30 ° or 45 °.

The working principle is as follows:

when the diaphragm gas meter is ventilated, the valve cover 1 rotates on the valve seat 2, and as shown in fig. 1, the valve cover 1 rotates anticlockwise. The valve cover air inlet 10 and the valve seat air inlets 8 below continuously change corresponding positions to feed air into the cavity for metering, and the air cannot leak between the valve cover air inlet 10 and the valve seat air inlet 8 in the working process, so that the contact surface between the valve cover 1 and the valve seat 2 is required to be smooth and always kept smooth to ensure that the valve cover 1 can not leave the valve seat 2 and can continuously rotate in the continuous rotating process.

The valve cover gap 11 is firstly transferred to the next cavity of the cavity where the valve cover air inlet 10 is filled with air. When the volume of the cavity below the valve cover air inlet 10 is about to reach the maximum value, the valve cover gap 11 can guide the air flow to ventilate to the next cavity in advance, and then the air is discharged to the air outlet channel 12, so that the situation that the rotating membrane type gas meter of the valve cover 1 is blocked due to the fact that the original valve seat air inlet below and the original valve seat air inlet under the situation that the original valve cover air inlet has no gap can be just aligned can be avoided.

Claims (6)

1. A rotary valve gas switching and distributing device for a diaphragm gas meter comprises a valve cover (1) and a valve seat (2); the method is characterized in that:

the valve seat (2) comprises a shaft seat ring (13) and an outer annular barrier (6), and the outer annular barrier (6) is connected with the shaft seat ring (13) by a plurality of inclined barrier ribs (7) to divide a plurality of valve seat air inlets (8);

a central shaft is arranged at the center of the shaft seat ring (13);

the center of the valve cover (1) is arranged on the central shaft;

the valve cover air inlet (10) of the valve cover (1) is matched and corresponding to the valve seat air inlet (8).

2. The rotary valve gas switching and distributing device for a membrane gas meter according to claim 1, characterized in that:

and a valve cover notch (11) is arranged on the advance angle of the valve cover air inlet (10).

3. The rotary valve gas switching and distributing device for a membrane gas meter according to claim 1, characterized in that:

the gas-facing surface of the inclined spacer rib (7) is opposite to the rotation direction of the valve seat (2).

4. The rotary valve gas switching and distributing device for a membrane gas meter according to claim 1, characterized in that:

the inner edge of the inclined spacer rib (7) is vertically and fixedly connected to the outer surface of the shaft seat ring (13), the outer edge of the inclined spacer rib (7) is fixedly connected to the inner ring of the outer ring-shaped spacer grid (6), and the upper point and the lower point of the outer edge of the inclined spacer rib (7) are staggered.

5. The rotary valve gas switching and distributing device for a membrane gas meter according to claim 1, characterized in that:

the number of the inclined spacer ribs (7) is four.

6. The rotary valve gas switching and distributing device for the membrane gas meter according to claim 1, characterized in that:

the shaft seat ring (13) is circular.

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