JPH0727589A - Wet gas meter drum - Google Patents

Abstract

PURPOSE:To provide a wet gas meter drum rarely causing the capacity fluctuation of measuring chambers during operation and the capacity change with the passage of time, capable of stably keeping high measurement accuracy over a long period, easy to adjust the capacity of the measuring chambers, and capable of being manufactured at a low cost. CONSTITUTION:The inside of a cylindrical drum barrel 1 is divided into a plurality of measuring chambers 3 arranged in the peripheral direction by a plurality of blade plates 2, outlet blade sections 5 and inlet blade sections 6 bent in opposite directions to each other are arranged to face the drum end face on both sides of the partition plate sections 4 of the blade plates 2 in a wet gas meter drum 10, and the partition plate sections 4 of the blade plates 2 are arranged in the twisted state.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a drum for a wet gas meter.

[0002]

2. Description of the Related Art Generally, a gas meter of this type has a cylindrical drum made of a metal or a hard synthetic resin, the inside of which is divided into a plurality of measuring chambers (usually four chambers) arranged in the circumferential direction. Above the horizontal drum axis, soak the gas in the liquid at a position slightly higher than the position where the gas passes from the inlet blade to the outlet blade, seal the measuring chamber with the liquid, and put the gas in the drum. When the gas is made to flow in, the gas is sequentially introduced into each of the measuring chambers as the drum rotates, and the gas is replaced with the liquid and discharged, and the integrated flow rate value of the gas is measured from the rotational speed of the drum. It

In such a wet gas meter, in order to obtain high measurement accuracy, each measuring chamber in the drum is accurately set to an equal volume, and it is difficult for the volume variation during operation and the volume variation over time to occur. It is desired that the drum has a small rotational load resistance, can rotate smoothly, and has a small pressure loss.

Conventionally, as the above-mentioned drum, one in which the inside of the drum barrel is divided by a plurality of blade plates (usually four) is generally used. Each blade has one plate and one having two plates. The blade plate having one plate is a thin plate having a substantially C shape as shown in FIG. By bending the valleys in two parallel folding curves (b) and (b) in the opposite direction, an arcuate recess (4a) is formed on the inner edge side.
A central partition plate part (4) having a central part, and a substantially fan-shaped outlet blade part (5) and an inlet blade part (6) extending in opposite directions from both sides of the partition plate part are formed. The outer edge (2a) forming an elliptic arc is joined to the inner periphery of the drum body, and the outlet blade portion (5) and the inlet blade portion (6) are arranged to face the drum end surface and spirally with respect to the inner periphery of the drum body. It Then, the respective end edges of the outlet blade portion (5) and the inlet blade portion (6) of each blade plate (2) intersect the folding curve (b) of the adjacent blade plate when viewed from the drum axial direction. The measuring chambers are arranged with a predetermined gap, and the inlet and outlet of each measuring chamber are configured.

[0005]

However, in the above-described conventional wet gas meter drum, since the partition plate portion (4) of the blade plate is formed in a flat shape, the rigidity thereof is low, and the partition plate portion is in operation. (4) is bent, and the capacity of the measuring chamber fluctuates due to this bending, and the balance of the measuring chambers is disturbed to cause uneven rotation of the drum, resulting in a decrease in measurement accuracy. Particularly, in the case of a drum made of a hard synthetic resin, the capacity variation due to the bending is particularly likely to occur in the material, and the partition plate portion (4) is deformed so as to warp to one side over a long period of time. There has been a problem that the measurement accuracy deteriorates with time due to a change in capacity of the measuring chamber and an imbalance.

On the other hand, in the prior art, when slightly changing the capacity of the measuring chamber, it was necessary to change the reference liquid surface position or use a blade plate having a different shape. Of these, when changing the liquid surface position, for example, when the liquid surface position becomes higher than the ideal reference liquid level, the dead point angle of the gas inlet / outlet of the measuring chamber becomes large, and the pressure temporarily changes during gas discharge / inlet. There is a problem in that the loss increases, uneven rotation occurs, and high measurement accuracy cannot be obtained. On the contrary, if the liquid surface position becomes too low, the measuring chamber may not be sealed by the liquid, and gas may pass through, which may result in deterioration of measurement accuracy.

Further, in the case of using a blade plate having an irregular shape,
It was necessary to change the design of the drum itself, and it was necessary to change the materials used and the processing specifications when manufacturing the meter, resulting in high costs. Even if such a design change is made, it is very difficult to set the liquid level position to the ideal reference liquid level due to manufacturing errors, etc. It was the current situation.

In the above description, the case where the blade plate is made of one plate has been described as an example, but the same problem as described above occurs even when the blade plate is made of two plates. There is no substitute.

In view of the above situation, the present invention makes it possible to easily adjust the capacity of the measuring chamber, manufacture it at a low cost, and prevent the capacity variation of the operating measuring chamber and the capacity change over time from occurring. A first object of the present invention is to provide a drum for a wet gas meter capable of maintaining high measurement accuracy stably for a long period of time, and also to provide a drum having a small rotational load resistance and a small pressure loss and capable of smoothly rotating. It has a secondary purpose.

[0010]

According to claim 1 of the present invention,
In order to achieve the first object, the inside of the cylindrical drum body (1) is divided into a plurality of measuring chambers (3) arranged in the circumferential direction by a plurality of blade plates (2), and each blade plate ( 2) A wet gas meter drum (1) in which an outlet blade portion (5) and an inlet blade portion (6), which are continuously provided on both sides of a partition plate portion (4) and bend in opposite directions, are arranged so as to face the drum end surface.
0), the partition plate portion (4) of each vane plate (2) is arranged in a twisted state.

According to a second aspect of the present invention, in order to achieve the second object, in the wet gas meter drum (10) according to the first aspect, the blade plate (2) is provided with a partition plate portion (4). The configuration is such that the interval between the two folding curves (a) and (a) divided into the outlet blade portion (5) and the inlet blade portion (6) is set narrower toward the drum center side.

Further, a third aspect of the present invention is the above-mentioned first aspect.
Alternatively, as the wet gas meter drum (10), the drum body (1) and the blade plate (2) are made of a hard synthetic resin.

[0013]

The drum (10) for a wet gas meter of the present invention
Then, the partition plate portion (4) of each vane plate (2) is twisted,
In other words, because it is three-dimensionally arranged in a twisted shape, it has high rigidity and excellent bending resistance, and even if it is made of hard synthetic resin, it does not bend due to hydraulic pressure or gas pressure during operation. The measuring chamber (3) is held in an equal volume, and since the partition plate portion (4) has a large strength, it is unlikely to be deformed over time, and stable and high measurement accuracy can be obtained for a long period of time. Moreover, the distance between the outlet blade portion (5) and the inlet blade portion (6) and the distance between the adjacent partition plate portions (4) change due to the degree of twist of the partition plate portion (4), and the measuring chamber (3 The capacity of the measuring chamber (3) can be finely adjusted by setting the twist degree.

The partition plate portion (4) of the blade plate (2), the outlet blade portion (5) and the inlet blade portion (6) are divided into two folding curves (a) and (a). Is set to be narrower toward the drum center side, the width of the partition plate portion (4) at the drum center side becomes narrower than that at the drum peripheral edge side when the vane plate (2) is incorporated in the drum body (1). That is, the outlet vane portion (5) and the inlet vane portion (6) are inclined toward the center of the drum so that the drum (10) is lowered.
The replaceability of the liquid with the gas in the above, that is, the flow of the liquid flowing in and out, is improved, the rotational load resistance of the drum (10) is reduced, and the pressure loss is reduced.

The drum body (1) and the blade plate (2) are made of, for example, hard polyvinyl chloride, acrylic resin,
If it is made of a hard synthetic resin such as polycarbonate, the drum body (1) and each vane plate (2) can be joined with an adhesive, so that the balance may be lost due to the variation in the soldering amount as in the case of a metal one. There is no risk of distortion of the vane plate due to heat, the production is easy and the material cost is low, and the use of transparent resin allows visual observation of the state inside the drum.

[0016]

EXAMPLES In a wet gas meter drum (10) shown in FIGS. 1 to 3, (1) is a short cylinder drum body, and (2)
Is a blade plate which divides the inside of the drum body (1) into four equal parts and constitutes four weighing chambers (3) arranged in the circumferential direction,
(7) is a drum cover having a circular gas introduction pipe insertion hole (7a) in the center part which is capped on the inlet side of the drum body (1), and (8) is an outlet side and an inlet side of the drum (10). Are a pair of cross-shaped connecting members that connect the four blades (2) with each other, and these are all made of a transparent hard synthetic resin such as hard polyvinyl chloride. (9) is the drum (1
0) is a pivotal shaft, and is inserted and retained by shaft support rings (11) and (11) that are fitted and fixed to the central portions of both connecting members (8) and (8).

The vane plate (2) is formed by bending a thin plate having a substantially C-shape as shown in FIG. 4 into two folding curves (a) and (a) shown by broken lines in the same figure, and bending the valleys in the opposite direction, and as shown in FIG. A substantially fan-shaped outlet blade portion (5) and an inlet blade portion (6) extending in opposite directions are formed on both sides of the partition plate portion (4). In this case, the bending curves (a) and (a) are different from the parallel bending curves (b) and (b) shown in FIG. Recess (4a)
Is set so that the mutual spacing on the side having the edge is narrowed, whereby the inner edge side of the partition plate portion (4) is set to the outer edge (2
It is narrower than the a) side.

However, each of the four blades (2) has a groove formed in advance on the inner peripheral surface of the drum body (1) as shown in FIG. 1 in a form in which the partition plate (4) is twisted. The outer edge (2a) is fitted to (12) and is fixed by an adhesive, and the outlet blade portion (5) and the inlet blade portion (6) face the drum end surface and the inner periphery of the drum body (1). In contrast to the spiral arrangement, the partition plate portion (4) is arranged in an inclined state in a twisted state as shown in FIG. The twist of the partition plate portion (4) is oriented such that the inclination angle of the drum peripheral edge side with respect to the axis of the drum (10) is larger than that of the drum center side.

The outlet vane portion (5) and the inlet vane portion (6) of each vane plate (2) have their respective edges (5a) (6a) adjacent to each other when viewed from the drum axial direction. The folding curves (a) are arranged so as to intersect with each other at predetermined intervals based on the spiral arrangement of both blades (5) and (6), and the drum center side of each edge (5a) (6a) is arranged. In, the joint members (8) and (8) are joined to each of the cross-shaped tip portions via an adhesive. Since the partition plate portion (4) of each vane plate (2) has a shape in which the drum central side is narrowed, both the outlet vane portion (5) and the inlet vane portion (6) are at the center of the drum end surface. It is inclined so that the side is concave.

The outlet passage (3a) and the inlet passage (3b) of each metering chamber (3) are provided with an edge (5a) of the outlet blade portion (5) and an inlet blade portion (6) of each blade plate (2). (6a)
A triangular opening (13) formed directly on the drum center side from the intersection of the curved line (a) and the vane portion (5) on the drum peripheral side of the intersection.
(6) is constituted by a gap in a portion overlapping the partition plate portion (4) of the adjacent blade plate (2).

The drum (10) having the above construction is incorporated in the casing of the wet gas meter and immersed in the liquid up to the reference liquid level L shown by the phantom lines in FIGS. 2 and 3. The respective measuring chambers (3) communicate with each other at the center of the drum (10), but since the reference liquid level L is higher than the highest communication level, it is on the liquid level with respect to other measuring chambers. The liquid is sealed, and the volume is set to be equal in this sealed state. Then, in the measurement, the blow-out pipe (not shown) is inserted into the drum cover (7) through the blow-out pipe insertion hole (7a).
And the outlet blade portion (5) of the blade plate (2) are inserted on the liquid surface, and gas is fed into the casing. Then, the fed gas is sequentially introduced into each measuring chamber (3) from the inlet passage (3b) on the liquid surface with the rotation of the drum (10),
Outlet passage (3a) along with movement of each measuring chamber (3) into liquid
Then, the gas is discharged from the casing through the blow-out pipe, and the integrated flow rate of the gas is measured from the number of revolutions of the drum (10) being fed.

Here, the partition plate portion (4) of each vane plate (2)
Since they are arranged in a twisted state and have high rigidity and excellent flexural strength, no flexure due to liquid pressure or gas pressure occurs during the above measurement, and each measuring chamber (3) is always held in an equal volume, which ensures high measurement accuracy. Can be secured. Further, since the partition plate portion (4) has a large strength due to the above-mentioned rigidity and is unlikely to be deformed with time, a change in capacity of each measuring chamber (3) with time is also suppressed, so that stable measurement accuracy can be obtained for a long period of time. To be Furthermore, since the outlet blade portion (5) and the inlet blade portion (6) are slanted toward the center of the drum, the exchanging property of liquid and gas in the drum (10), that is, the flow of liquid in and out, is good, and therefore the measuring chamber (3).
The liquid level fluctuation inside the drum (10) is reduced, the rotational load resistance of the drum (10) is also reduced, the pressure loss of the meter is reduced, and the instrumental error accuracy is improved. Moreover, since the volume of the measuring chamber (3) changes depending on the degree of twist of the partition plate portion (4), the volume of the measuring chamber (3) can be finely adjusted by setting the degree of twist.

In the present invention, the drum body (1) of the drum (10), the blade plate (2), and the connecting member (8) made of opaque hard synthetic resin or metal may be used. In the above embodiment, the outer edge (2a) of the vane plate (2) is provided in the groove (12) provided on the inner peripheral surface of the drum body (1) in order to improve the mounting position accuracy of the vane plate (2) and the workability of assembly. However, the outer edge (2a) of the vane plate (2) may be joined to the inner peripheral surface of the drum body (1) without interposing such a groove (12).

[0024]

According to the invention of claim 1, since the partition plate portion of each blade plate dividing the inside of the drum into a plurality of measuring chambers has structurally large rigidity and excellent flexural strength, Even when the plate is made of hard synthetic resin, each measuring chamber is held in an equal volume without bending due to liquid pressure or gas pressure during operation, and it is possible to secure high measurement accuracy without causing rotational unevenness and the partition plate. Since the strength of the portion is large and deformation with time is unlikely to occur, a change in the capacity of each measuring chamber over time is suppressed, and a drum for a wet gas meter is provided that can obtain stable measurement accuracy for a long period of time. In addition, this wet gas meter drum may have the same configuration as a conventional general-purpose one except that the partition plate portion of each vane plate is arranged in a twisted state, so that it can be easily manufactured at low cost using existing manufacturing equipment and materials. It can be manufactured. Moreover, the volume of the measuring chamber can be finely adjusted by setting the degree of twist of the partition plate portion, and when the volume is changed, it is not necessary to drastically change the members used or the processing specifications. Further, since the volume of the measuring chamber can be finely adjusted in this way, the liquid level position can be set to an ideal reference liquid level, and thus higher measurement accuracy can be obtained.

According to the second aspect of the present invention, as the wet gas meter drum, the flow of liquid in and out is good, the fluctuation of the liquid level in the measuring chamber is small, the rotational load resistance is also small, and the pressure loss of the meter is reduced. It is possible to provide a device with high accuracy and high instrumental accuracy.

According to the third aspect of the present invention, as the above-mentioned wet gas meter drum, the drum body and each vane plate can be joined by an adhesive agent, and the balance due to the variation in the soldering amount as in the case of a metal one can be achieved. There is provided a product which is free from the distortion of the vane plate due to distortion and heat, is easy to manufacture, has a low material cost, and allows the internal state to be visually observed by using a transparent resin.

[Brief description of drawings]

FIG. 1 is a perspective view showing a notched part of a drum for a wet gas meter according to an embodiment of the present invention.

FIG. 2 is a rear view of the wet gas meter drum of the embodiment.

3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is a development view of a vane plate used for the wet gas meter drum of the embodiment.

FIG. 5 is a front view of the same vane plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drum body 2 ... Vane plate 3 ... Measuring chamber 4 ... Partition plate part 5 ... Exit vane part 6 ... Inlet vane part 10 ... Wet gas meter drum a ... Folding curve

Claims (3)

[Claims] 1. A cylindrical drum body is divided into a plurality of measuring chambers arranged in a circumferential direction by a plurality of blade plates, and the measuring chambers are connected to both sides of a partition plate portion of each blade plate and bent in opposite directions. A wet gas meter drum in which an outlet blade portion and an inlet blade portion are arranged so as to face an end surface of the drum, and a partition plate portion of each blade plate is arranged in a twisted state. 2. The drum for a wet gas meter according to claim 1, wherein the blade plate is divided into a partition plate portion, an outlet blade portion, and an inlet blade portion, and the interval between the two folding curves is set narrower toward the drum center side. 3. The drum for a wet gas meter according to claim 1, wherein the drum body and the blades are made of a hard synthetic resin.