A diaphragm gas meter valve switching gas distribution device

Abstract

A rotary valve gas switching and distribution device for a diaphragm gas meter, belonging to the field of metering instrument technology, includes a valve cover and a valve seat. The valve seat includes a shaft seat ring and an outer annular grid. The outer annular grid and the shaft seat ring are connected by multiple inclined ribs to divide multiple valve seat air inlets. The valve cover is located on the central shaft of the shaft seat ring. The air inlet of the valve cover matches and corresponds to the air inlet of the valve seat. There is a valve cover notch at the advance angle of the air inlet of the valve cover. During the rotation of the valve cover, dust and / or impurities will slide to the lower edge of the inclined surface of the inclined ribs, where there is a valve cover notch. When the volume of a cavity below the air inlet of the valve cover is about to reach its maximum value, the valve cover notch will guide the airflow to the next cavity in advance, thus restricting the cavity that is about to reach its maximum volume and preventing a large negative deviation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of measuring instruments, and particularly relates to a valve rotating gas switching and distributing device for a diaphragm gas meter. BACKGROUND

[0002] The mainstream gas meter on the market is a diaphragm gas meter. The valve cover and the valve seat are important components of the diaphragm gas meter. When the diaphragm gas meter is working, the airflow in the cavity pushes the external connecting rod mechanism, and the valve cover rotates on the valve seat under the driving of the connecting rod mechanism. The diaphragm gas meter continuously changes the gas inlet and the gas outlet passage to send the gas into the cavity for metering and discharge the gas in the cavity to the gas outlet passage. In the working process, the gas cannot leak in the gas inlet and the gas outlet passage of the diaphragm gas meter, which requires that the contact surface of the valve cover and the valve seat is smooth and always flat to ensure that the valve cover cannot leave the valve seat and continuously rotates.

[0003] The center line of the partition rib on the valve seat of the diaphragm gas meter on the market passes through the center of the valve seat. In the rotating process of the valve cover, the same point has no relative motion, which is easy to accumulate some dust and / or impurities on the partition rib. When the dust and / or impurities accumulate more and more, the edge of the contact surface of the valve cover and the valve seat will have a protrusion, which increases the resistance when the valve cover rotates and causes a larger gap between the valve cover and the valve seat. SUMMARY

[0004] The purpose of the present application is to provide a valve rotating gas switching and distributing device for a diaphragm gas meter, which can ensure that the valve cover cannot leave the valve seat and continuously rotates in a good contact sliding state.

[0005] The technical scheme adopted is:

[0006] A valve rotating gas switching and distributing device for a diaphragm gas meter, comprising a valve cover and a valve seat. The valve cover is characterized in that:

[0007] The valve seat comprises a shaft seat ring and an outer ring-shaped partition grid, and a plurality of inclined partition ribs are arranged between the outer ring-shaped partition grid and the shaft seat ring to divide a plurality of valve seat gas inlets.

[0008] A center shaft is arranged at the center of the shaft seat ring.

[0009] The center of the valve cover is arranged on the center shaft.

[0010] The valve cover gas inlet of the valve cover is matched with the valve seat gas inlet.

[0011] The valve cover gas inlet is provided with a valve cover gap at the lead angle.

[0012] The valve cover gas inlet is provided with a valve cover gap at the lead angle.

[0013] When the valve seat adopts this kind of inclined partition design, the accumulation of dust and / or impurities can be reduced. When the valve cover rotates, the valve cover and the valve seat will move relatively. According to the linear velocity formula V=s / t=2πR / T, the linear velocities of the points on the tangent line are different, but the linear velocities of the points on the original straight partition are the same, which is easy to accumulate dust and / or impurities. However, the same point on the inclined partition will also move relatively in the radial direction during the continuous rotation, so the dust and / or impurities will slide to the lower edge of the inclined surface of the inclined partition with the rotation of the valve cover, and then fall with the gas. Therefore, the contact surface of the valve cover and the valve seat is relatively smooth, and a good sliding contact state is ensured.

[0014] The valve cover is provided with a valve cover gap. When the volume of the cavity below the inlet of the valve cover, such as the first cavity, is about to reach the maximum value, the valve cover gap will guide the gas flow to the next cavity, i.e. the second cavity, to be ventilated in advance. In this way, the pressure balance is achieved, and the cavity with the maximum volume is limited, and the volume no longer continues to increase. If the measurement volume is too large, the large flow error value will have a large negative deviation, which will increase the curve difference of the error curve. The effective control of the valve cover gap on the phenomenon of excessive volume improves the adjustment of the error value. The core body, cavity, connecting rod mechanism and gas outlet channel of the diaphragm gas meter are known technologies.

[0015] The device has reasonable design and is easy to install. Without making large changes to the existing structure of the diaphragm gas meter, the function can be realized, and the device has strong practicality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a top view of the valve cover.

[0017] Figure 2 It is a perspective structural schematic view of Figure 1 .

[0018] Figure 3 It is a top view of the valve seat and the core body.

[0019] Figure 4 It is a local schematic view of the inclined partition.

[0020] Figure 5 It is a top view of the structure of the interaction between the valve seat and the valve cover.

[0021] Figure 6 It is a front view of the structure of the interaction between the valve seat and the valve cover.

[0022] Valve cover 1, valve seat 2, core body 3, inner ring-shaped partition 4, middle ring-shaped partition 5, outer ring-shaped partition 6, inclined partition 7, valve seat inlet 8, reinforcing rib 9, valve cover inlet 10, valve cover gap 11, gas outlet channel 12, shaft seat ring 13. DETAILED DESCRIPTION

[0023] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. The components not described in the present application are prior art or standard products, and will not be described again.

[0024] A valve switching and distributing device for a diaphragm gas meter comprises a valve cover 1 and a valve seat 2.

[0025] As shown in Figure 3 and Figure 4 : the valve seat 2 is fixedly installed on the core body 3, and 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 by a plurality of inclined partition ribs 7 to divide a plurality of valve seat air inlets 8. In the present embodiment, there are four inclined partition ribs 7, which evenly divide four valve seat air inlets 8 on the circumference.

[0026] The upper edges of the shaft seat ring 13, the inclined partition ribs 7 and the outer annular barrier 6 are flush in height. The plurality of inclined partition ribs 7 form a structure similar to a plurality of blades on the circumference.

[0027] The shaft seat ring 13 is circular. The outer annular barrier 6 is annular.

[0028] The shaft seat ring 13 comprises a middle annular barrier 5 and an inner annular barrier 4. The middle annular barrier 5 and the inner annular barrier 4 are in a closed structure with a bottom sealing plate, and a plurality of reinforcing ribs 9 can be arranged in the radial direction of the upper layer. In the present embodiment, there are three reinforcing ribs 9, which are evenly arranged on the circumference.

[0029] The inner annular barrier 4 is provided with a central shaft, and the shaft seat ring 13 is also provided with a central shaft.

[0030] The middle annular barrier 5 and the inner annular barrier 4 are both annular.

[0031] As shown in Figure 5 and Figure 6 : the valve cover 1 is arranged on the central shaft and can freely rotate above the valve seat 2. The valve cover 1 is circular with a flat bottom surface.

[0032] As shown in Figure 1 and Figure 2 : the valve cover air inlet 10 of the valve cover 1 matches the shape, size and angle of the valve seat air inlet 8 divided by the upper edge of the inclined partition rib 7 of the valve seat 2. This can divide different valve seat air inlets 8 to correspond to different cavities of the diaphragm gas meter.

[0033] The upper edge of the inclined partition rib 7 is in contact with the lower end surface of the valve cover 1.

[0034] The valve cover intake port 10 is provided with a valve cover notch 11 in advance. When the valve cover intake port 10 is aligned with a lower cavity, the valve cover notch 11 is in advance aligned with a region of the next cavity. The valve cover notch 11 can also be of other shapes as long as it can be in advance aligned with a region of the next cavity.

[0035] Further, the air-incident surface of the inclined partition rib 7 is arranged opposite to the rotation direction of the valve seat 2.

[0036] Further, as shown in Figure 1 , the extension line of the advanced edge of the valve cover intake port 10 intersects with a radius MN, and the edge of the valve cover notch 11 is at an angle A of 10°-45° with the radius MN. The position of the edge vertex C of the valve cover notch 11 is not particularly limited.

[0037] Further, the top view of the inclined partition rib 7 can be similar to a triangular shape, as shown in Figure 3 .

[0038] Further, the inner edge of the inclined partition rib 7 is vertically fixedly connected to the outer surface of the shaft seat ring 13, i.e., the outer surface of the middle annular partition 5, and the outer edge of the inclined partition rib 7 is fixedly connected to the inner ring of the outer annular partition 6. The upper point and the lower point of the outer edge of the inclined partition rib 7 are staggered, as shown in Figure 4 .

[0039] The angle A can be specifically 10°, 30° or 45°.

[0040] The working principle is as follows:

[0041] When the diaphragm gas meter is vented, the valve cover 1 rotates on the valve seat 2, as shown in Figure 1 , the valve cover 1 rotates counterclockwise. The valve cover intake port 10 and the multiple valve seat intake ports 8 below continuously change corresponding positions to send gas into the cavities for metering. During the working process, there should be no leakage of gas between the valve cover intake port 10 and the valve seat intake port 8. This requires that the contact surface of the valve cover 1 and the valve seat 2 be smooth and always flat to ensure that the valve cover 1 cannot leave the valve seat 2 and continuously rotate.

[0042] The valve cover notch 11 is first rotated to the next cavity of the cavity into which the valve cover intake port 10 is inhaled. When the volume of the cavity below the valve cover intake port 10 is about to reach the maximum value, the valve cover notch 11 will guide the gas flow to the next cavity in advance, and then discharge the gas to the gas outlet channel 12, which can also avoid the situation that the valve cover 1 is stuck due to the original valve cover intake port without a notch and the original valve seat intake port below being aligned.

Claims

1. A valve rotating gas switching and distributing device for diaphragm gas meter, comprising a valve cover (1) and a valve seat (2); characterized in that: the valve seat (2) comprises a shaft seat ring (13) and an outer ring-shaped partition (6), and a plurality of inclined partition ribs (7) are connected between the shaft seat ring (13) and the outer ring-shaped partition (6) to divide a plurality of valve seat gas 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 gas inlets (10) of the valve cover (1) are matched and corresponding to the valve seat gas inlets (8); an advanced angle of the valve cover gas inlets (10) is provided with a valve cover gap (11); an edge of the valve cover gap (11) and a radius MN have an included angle A of 10°-45°.

2. The valve rotating gas switching and distributing device for diaphragm gas meter according to claim 1, characterized in that: an inner edge of the inclined partition rib (7) is vertically fixedly connected to an outer surface of the shaft seat ring (13), an outer edge of the inclined partition rib (7) is fixedly connected to an inner ring of the outer ring-shaped partition (6), and a point and a lower point position of the outer edge of the inclined partition rib (7) are staggered.

3. The valve rotating gas switching and distributing device for diaphragm gas meter according to claim 1, characterized in that: the inclined partition rib (7) is four.

4. The valve rotating gas switching and distributing device for diaphragm gas meter according to claim 1, characterized in that: the shaft seat ring (13) is circular. ​

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