JP2624615B2 - Drum for wet gas meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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 includes a cylindrical drum made of a metal or a hard synthetic resin and divided into a plurality of measuring chambers (usually four chambers) whose insides are arranged in a circumferential direction. Above the horizontal drum axis, the gas is immersed in the liquid at a position slightly higher than the position at which the gas passes from the inlet blade to the outlet blade, the measuring chamber is sealed with the liquid, and the gas is introduced into the drum. By flowing the gas, the gas is sequentially introduced into each measuring chamber with the rotation of the drum, replaced with the liquid, and discharged, and the integrated flow value of the gas is measured from the rotation speed of the drum. You.

In order to obtain high measurement accuracy, such a wet gas meter requires that each of the measuring chambers in the drum be set to an exactly equal volume, and that the volume change during operation and the volume change over time hardly occur. In addition, it is desired that the drum has a small rotational load resistance, can rotate smoothly, and has a small pressure loss.

Heretofore, as the above-mentioned drum, a drum in which the inside of a drum body is divided by a plurality of (usually four) blade plates is generally used. This blade plate is formed by forming a substantially C-shaped thin plate as shown in FIG.
In other words, the leftmost dashed line (a) and the imaginary line (d) in the same figure are bent in the opposite direction to the valleys, so that the central partition plate portion and the substantially fan-shaped outlet blade portions and the inlet portions projecting in opposite directions from both sides thereof The outer edge forming an elliptical arc in a bent state is joined to the inner circumference of the drum body, and the outlet blade section and the inlet blade section face the drum end face and with respect to the inner circumference of the drum body. It is arranged in a spiral. Thus, each edge of the outlet blade portion and the inlet blade portion of each blade plate is respectively
The blades are arranged at predetermined intervals so as to intersect with the fold curves of the adjacent blades as viewed from the drum axis direction, and form entrances and exits of the respective measurement chambers.

[0005]

However, in the above-described conventional wet gas meter drum, at the outlet or the inlet, there are many overlapping portions of the outlet blades or the adjacent inlet blades between adjacent blade plates. However, there is a problem that the opening area is reduced, the load (fluid resistance) when discharging and injecting the liquid is increased, the pressure loss is increased, and the measurement accuracy is reduced.

Further, in the conventional drum, since the partition plate portion of the blade plate is formed flat over the entire area, its rigidity is low, and the partition plate portion (4) bends during operation. In addition, the capacity of the measuring chamber fluctuates, and the balance of each measuring chamber is out of order, causing uneven rotation of the drum. In particular, in the case of a drum made of a hard synthetic resin, the capacity change due to the bending is particularly apt to occur, and the partition plate (4) is deformed so as to warp to one side within a long period of time. There has been a problem that the measurement accuracy decreases over time due to a change in the capacity of the measuring chamber and an imbalance.

In addition, conventionally, when the capacity of the measuring chamber is changed, it is necessary to change the reference liquid level position or to use a blade having a different shape. And the change of the processing specifications forced the cost to rise.

In view of the above circumstances, the present invention provides a wet gas meter drum that can rotate smoothly with small rotating load resistance and pressure loss during operation, and is less likely to cause a fluctuation in the capacity of the measuring chamber and a change in the capacity over time. It is another object of the present invention to provide a measuring apparatus capable of stably maintaining high measuring accuracy for a long period of time, and capable of easily adjusting the capacity of the measuring chamber and manufacturing it at low cost.

[0009]

Means for Solving the Problems Claim 1 of the present invention provides:
In order to achieve the first object, the inside of the cylindrical drum cylinder (1) is divided into a plurality of measuring chambers (3) arranged in the circumferential direction by a plurality of blades (2), and each blade ( A wet gas meter drum (A) in which an outlet blade (5) and an inlet blade (6), which are provided on both sides of the partition plate (4) of (2) and are bent in opposite directions to each other, face the drum end surface. )
In (B), at least one of the outlet blade part (5) and the inlet blade part (6) of each blade plate (2) and the partition plate part (4).
And a stepped or curved bent transition portion (7) exists between the two.

The second aspect of the present invention is the first aspect.
As the wet gas meter drums (A) and (B), a configuration in which a drum body (1) and a blade (2) are formed of a hard synthetic resin is employed.

[0011]

The drum for wet gas meter of the present invention (A)
In (B), a stepped or curved bent transition portion is provided between at least one of the outlet blade portion (5) and the inlet blade portion (6) of each blade plate (2) and the partition plate portion (4). Because of the presence of (7), one of the blades (5) (6) from the partition plate (4)
Is reduced, and the opening area between the blades (2) and (2) at the outlet or inlet of each measuring chamber (3) is increased. Is good, the fluctuation of the liquid level in the measuring chamber (3) is small, the rotational load resistance of the drums (A) and (B) is reduced, and the pressure loss of the meter is also small.

[0012] Further, due to the presence of the bent transition portion (7), the area of the flat plate portion in the partition portion of the measuring chamber (3) is small,
As a result, the partitioning portion is less likely to bend, and the rigidity of the blade plate (2) as a whole is increased. Even if the blade plate (2) is made of a hard synthetic resin, the blade plate (2) does not deform due to the liquid pressure or gas pressure during operation. The weighing chambers (3) are kept at the same capacity, and the strength of the blades (2) is large, so that deformation over time hardly occurs.

On the other hand, since the capacity of the measuring chamber (3) changes depending on the size and the transition shape of the bent transition section (7), the capacity of the measuring chamber (3) can be finely adjusted by setting the specifications of the bent transition section (7). .

Thus, the drum cylinder (1) and the blade (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 of the blades (2) can be joined with an adhesive. There is no risk of the blades being distorted due to heat, the production is easy and the material cost is low, and the use of transparent resin makes it possible to visually observe the inside of the drum.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the wet gas meter drum (A) of the first embodiment shown in FIGS. 1 to 3, (1) is a short cylindrical drum cylinder, and (2) is 4 or the like inside the drum cylinder (1). Four blades (8) constituting four measuring chambers (3) divided into parts and arranged in the circumferential direction are provided with a circular gas introduction into a central portion mounted on the inlet side of the drum cylinder (1). A drum cover having a tube insertion hole (8a), (9) is a pair of cross-shaped connecting members for connecting the four blades (2) on the outlet side and the inlet side of the drum (A), Are formed of a transparent hard synthetic resin such as hard polyvinyl chloride. Reference numeral (10) denotes a pivot shaft of the drum (A), which is inserted into and held by a shaft support ring (11) (11) fixedly fitted to the center of both connecting members (9) (9).

The wing plate (2) is formed by bending a thin plate having a substantially C-shape in the unfolded state as shown in FIG. 4 in one direction at a broken line (a) on the left side of the figure, and dashed lines (b) and (c) at the middle and right sides. ) In the direction opposite to the broken line (a) and gently bent so that the bending angle becomes the bending angle of the broken line (a) in total, as shown in FIG. A substantially fan-shaped outlet blade portion (5) is formed on one side of the partition member, and a step-shaped transition portion (7) is interposed on the other side of the partition plate portion (4). A substantially fan-shaped inlet blade (6) projecting in the opposite direction is formed.

Each of the four blade plates (2) is bonded by fitting an outer edge (2a) into a groove (12) formed in advance on the inner peripheral surface of the drum body (1) as shown in FIG. The outlet blade (5) and the inlet blade (6) face the drum end face and are arranged spirally with respect to the inner circumference of the drum barrel (1). Thus, the outlet blade (5) and the inlet blade (6) of each blade (2) are formed by the edge (5a) (6a) of the blade (2) adjacent to each other when viewed from the drum axis direction. It crosses the bent transition portion (7) at a predetermined interval based on the spiral arrangement of both blade portions (5) and (6), and between the adjacent blade plates (2) and (2) at this crossing portion. Constitutes an outlet passage (3a) and an inlet passage (3b) of each measuring chamber (3). In addition, each connecting member (9) has a cross-shaped tip,
The four blades (2) are bonded via an adhesive to the two blades (5) and (6) at the center of the drum and near the edges (5a) and (6a). In addition, the dashed line (d) in FIG. 2 shows a boundary bending curve between the partition plate portion (4) and the outlet blade portion (5) in the conventional blade plate.

FIG. 6 shows a drum (B) for a wet gas meter according to the second embodiment. In this drum (B), as the four blades (2), a bent transition portion (7) is formed by bending between the broken lines (b) and (c) of the thin plate shown in FIG.
The other components are the same as those of the first embodiment, except that the configuration of each part is the same as that of the first embodiment.
Is the same as

The drum (A) of the first and second embodiments
In (B), each of the measuring chambers (3) communicates with each other at the center of the drum. However, when the measuring chambers (3) are incorporated in the casing of the wet gas meter and used, the two-dot chain lines in FIGS. 2 and 3 or FIG. The liquid is immersed in the liquid up to the indicated reference liquid level L, and the reference liquid level L is higher than the highest communication level. Therefore, the liquid is sealed to the other measuring chambers (3) on the liquid surface. It is set to be equal capacity in the state.

In the measurement, an outlet pipe (not shown) is inserted from the outlet pipe insertion hole (8a) to a position above the liquid level between the drum cover (8) and the outlet blade (5) of the blade plate (2). To feed gas into the casing. Then, the fed gas is sequentially introduced from the inlet passage (3b) on the liquid surface into each of the measuring chambers (3) with the rotation of the drums (A) and (B). Exit passage (3)
The gas discharged from a) is discharged from the casing through the blowing pipe, and the integrated flow value of the gas is measured from the rotation speed of the drum (10) during the feeding.

Since each blade plate (2) has a stepped or curved bent transition portion (7) between the partition plate portion (4) and the outlet blade portion (5), the measuring chamber is provided. Since the area of the flat plate portion in the partition portion of (3) is small, it is difficult to bend at the partition portion, and the rigidity of the entire blade plate (2) increases, so that the blade plate ( Each measuring chamber (3) is maintained at an equal volume without deformation of 2), and high measurement accuracy can be secured.
Because of the high strength, it is hard to be deformed over time,
High and stable measurement accuracy can be maintained over a long period.

Further, due to the existence of such a bent transition portion (7), as is clear from the comparison with the bent state of the conventional blade shown by phantom lines in FIGS. 5 and 7, the partition plate portion (4) The protrusion of the portion that transitions from the outlet to the outlet blade portion (5) is reduced, and the opening area of the outlet passage (3a) of each measuring chamber (3) is widened. The flow is good, the fluctuation of the liquid level in the measuring chamber (3) is small, the rotational load resistance of the drums (A) and (B) is small, the pressure loss of the meter is reduced, and the accuracy of the instrument difference is improved.

The width of the bent transition portion (7) of the blade (2) in the first embodiment is changed, or the width and the degree of curvature of the bent transition portion (7) in the second embodiment are changed. Since the capacity of the weighing chamber (3) changes, the capacity of the weighing chamber (3) can be finely adjusted by setting the specifications of these bent transition portions (7).

In the first and second embodiments, the blade (2)
Although the bent transition part (7) is typically shown between the partition plate part (4) and the outlet blade part (5), the bent transition part (7) is connected to the partition plate part (4). It may be interposed between the inlet blade (6) and between the partition plate (4), the outlet blade (5) and the inlet blade (6). Further, such a bent transition portion (7) may be configured to have a plurality of flat portions by bending itself, or may be configured to be a combination of a flat portion and a curved portion. Further, in the present invention, the drum body (1), the blade plate (2), and the connecting member (8) may be made of opaque hard synthetic resin or metal. In the above embodiment, the outer edge (2a) of the blade (2) is provided in the groove (12) provided on the inner peripheral surface of the drum body (1) in order to enhance the mounting position accuracy of the blade (2) and the workability of assembly. Is adopted, but the outer edge (2a) of the blade plate (2) may be bonded and fixed to the inner peripheral surface of the drum body (1) without passing through such a groove (12). .

[0025]

According to the first aspect of the present invention, a stepped or curved transition portion exists between at least one of the outlet blade portion and the inlet blade portion of each blade plate and the partition plate portion. Therefore, the protrusion of the portion that transitions from the partition plate portion to the one blade portion is reduced, and the opening area between the blade plates at the outlet portion or the inlet portion of each measurement chamber is increased, so that the liquid and gas are replaced. The flow of the liquid in and out is good, the fluctuation of the liquid level in the measuring chamber is small, the rotational load resistance of the drum is reduced, and the one with good instrumental accuracy is provided.

Further, the presence of the bent transition portion reduces the area of the flat plate portion in the partition portion of the measuring chamber, thereby making it harder to bend in the partition portion, and increasing the rigidity of the entire blade plate, and made of a hard synthetic resin. Even when the blades are not deformed by the liquid pressure or gas pressure during operation, each measuring chamber is maintained at the same volume, and since the strength of the blades is large, deformation over time is hard to occur. Changes in the capacity of the weighing chamber over time are also suppressed, so that stable measurement accuracy can be obtained over a long period of time.

Furthermore, this wet gas meter drum has the same configuration as that of a conventional general-purpose drum except that a bent transition portion is provided between at least one of the outlet blade portion and the inlet blade portion of each blade plate and the partition plate portion. Because it is good, it can be manufactured easily and at low cost using existing manufacturing equipment and materials. In addition, the capacity of the weighing chamber can be fine-tuned by setting the specifications of this bent transition part, and when changing the capacity, the materials used and processing specifications will be greatly No modification is required.

According to the second aspect of the present invention, as the above-mentioned wet gas meter drum, the drum body and each blade plate can be joined with an adhesive, and the balance due to the variation in the amount of soldering as in the case of a metal-made gas meter can be obtained. There is provided a product which is free from the possibility of causing the blades to be distorted by heat and heat, easy to manufacture and low in material cost, and capable of visually observing the internal state by using a transparent resin.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a drum A for a wet gas meter according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a drum A for a wet gas meter according to the first embodiment.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is an exploded view of a blade used for the wet gas meter drums A and B of the first embodiment and the second embodiment.

FIG. 5 is a front view of the blade plate in the first embodiment.

FIG. 6 is a drum B for a wet gas meter according to a second embodiment.
It is a vertical side view.

FIG. 7 is a front view of a blade plate according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drum cylinder 2 ... Blade board 3 ... Metering chamber 4 ... Partition board part 5 ... Outlet blade part 6 ... Inlet blade part 7 ... Bending transition part A, B ... Wet gas meter drum

Claims (2)

(57) [Claims] 1. The inside of a cylindrical drum cylinder is divided into a plurality of measuring chambers arranged in the circumferential direction by a plurality of blades, and is provided on both sides of a partition plate of each blade and bent in opposite directions. In the wet gas meter drum in which the outlet blade portion and the inlet blade portion are arranged so as to face the drum end surface, a stepped or curved portion is formed between at least one of the outlet blade portion and the inlet blade portion of each blade plate and the partition plate portion. A drum for a wet gas meter, characterized by having a bent transition portion having a shape. 2. The drum for a wet gas meter according to claim 1, wherein the drum body and the blade plate are formed of a hard synthetic resin.