JP2644667B2 - 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. Each of the blades is composed of a single plate or a two-plate. A single-plate vane is a thin plate having a substantially C shape as shown in FIG. In the two parallel folding curves (b) and (b), the valleys and the valleys are bent in reverse to form an arc-shaped concave portion (4a) on the inner edge side.
A central partition plate portion (4) having the above, and a substantially fan-shaped outlet blade portion (5) and an inlet blade portion (6) projecting in opposite directions from both sides thereof. An outer edge (2a) forming an elliptical arc is joined to the inner periphery of the drum body, and an outlet blade (5) and an inlet blade (6) face the drum end face and are spirally arranged with respect to the inner periphery of the drum body. You. Thus, the respective edges of the outlet blade (5) and the inlet blade (6) of each blade (2) intersect the folding curve (b) of the adjacent blade as viewed from the drum axis direction. The weighing chambers are arranged at predetermined intervals in the form, and the entrance and exit of each measuring chamber are constituted.

[0005]

However, in the conventional wet gas meter drum, since the partition plate (4) of the blade plate is formed flat, its rigidity is reduced, and the partition plate during operation is reduced. (4) is deflected, and the deflection causes the capacity of the measuring chamber to fluctuate, and causes the balance of each measuring chamber to be out of order, resulting in uneven rotation of the drum, resulting in a decrease in measurement accuracy. 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.

On the other hand, in the past, when the capacity of the measuring chamber was slightly changed, it was necessary to change the reference liquid surface position or to use a blade having a different shape. When the liquid level is changed, for example, when the liquid level is higher than the ideal reference liquid level, the dead angle of the gas inlet / outlet of the measuring chamber becomes large, and the pressure is temporarily reduced when the gas is discharged / input. There is a problem that the loss increases and rotation unevenness occurs and high measurement accuracy cannot be obtained. Conversely, if the liquid level is too low, the measuring chamber will not be sealed by the liquid, and gas may pass through, resulting in a decrease in measurement accuracy.

In the case of using a differently shaped blade plate,
A change in the design of the drum itself was required, which necessitated changes in the components used and processing specifications in the manufacture of the meter, resulting in high costs. Furthermore, even if such a design change is made, it is very difficult to set the liquid level to an ideal reference liquid level due to manufacturing errors and the like. It was the current situation.

In the above description, an example is described in which the blade plate is formed of a single plate. However, even when the blade plate is formed of two plates, the same problem as described above may occur. There is no change.

In view of the above situation, the present invention can easily adjust the capacity of the measuring chamber, can be manufactured at low cost, and is less likely to cause a change in the capacity of the operating measuring chamber and a change in the capacity over time. It is a first object of the present invention to provide a drum for a wet gas meter capable of stably maintaining high measurement accuracy for a long period of time, and 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]

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 is divided into a plurality of measuring chambers arranged in a circumferential direction by a plurality of blades, and is continuously provided on both sides of a partition plate portion of each blade. In the wet gas meter drum in which the outlet blade portion and the inlet blade portion which are bent in opposite directions to each other face the drum end surface, the partition plate portion of each blade plate has a drum on the outer edge side thereof.
The angle of inclination with respect to the axis is larger than that at the inner edge
Thus, a configuration characterized by being arranged in a twisted state is adopted.

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 (2) is connected to the partition plate (4). The interval between the two folded curves (a) and (a) divided into the outlet blade portion (5) and the inlet blade portion (6) is the blade plate development shape.
In this embodiment, the configuration is such that the width is set narrower toward the center of the drum.

Further, the third aspect of the present invention is the first aspect.
Alternatively, as the second wet gas meter drum (10), a configuration in which the drum body (1) and the blade plate (2) are formed of a hard synthetic resin is adopted.

[0013]

The drum for a wet gas meter according to the present invention (10)
Then, the partition plate (4) of each blade (2) is twisted,
In other words, because they are three-dimensionally arranged in a three-dimensional manner with a twist, they have high rigidity and excellent bending resistance, and even if they are made of hard synthetic resin, they do not bend due to liquid pressure or gas pressure during operation. The weighing chamber (3) is maintained at the same volume, and the strength of the partition plate (4) is large, so that deformation over time is unlikely to occur, and stable high measurement accuracy can be obtained over a long period of time. Moreover, the inclination of the outer edge of the partition plate with respect to the drum axis
In order to make the angle larger than that of the inner edge,
Since (4) is arranged in a twisted state, the partition plate part
(4) The dimension in the drum axis direction is larger on the inner edge side than on the outer edge side.
The method is shortened, and the outlet blade (5) and the inlet blade (6)
Are inclined so that the center of the drum end surface is concave.
For this reason, the exchangeability between the liquid and the gas in the drum (10) is
The flow of in and out of the condensate becomes better,
The rolling load resistance is reduced, and the pressure loss is also reduced. Further , the distance between the outlet blade (5) and the inlet blade (6) and the distance between the adjacent partition plates (4) change depending on the degree of twist of the partition plate (4). ), The capacity of the measuring chamber (3) can be adjusted by setting the degree of twist.

The distance between the two folding curves (a) and (a) is divided into the partition plate (4), the outlet blade (5) and the inlet blade (6) of such a blade (2). If the blade plate (2) is set so as to be narrower toward the center of the drum, the center (inner side) of the partition plate (4 ) is positioned on the peripheral side (outer side) of the drum in a state where the blade (2) is incorporated in the drum body (1). (Edge side) , the outlet blade section (5) and the inlet blade section (6) can be more reliably inclined to the drum center side lower, more reliably .
Thereby, the exchangeability between the liquid and the gas in the drum (10), that is , the flow of the liquid in and out, is further improved .

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.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a wet gas meter drum (10) shown in FIGS. 1-3, (1) is a short cylindrical drum body, (2)
Are four blades which divide the inside of the drum body (1) into four equal parts and constitute four measuring chambers (3) arranged in the circumferential direction;
(7) is a drum cover having a circular gas inlet pipe insertion hole (7a) at the center thereof, which is mounted on the inlet side of the drum body (1), and (8) is an outlet side and an inlet side of the drum (10). And a pair of cross-shaped connecting members for connecting the four blades (2), each of which is formed of a transparent hard synthetic resin such as hard polyvinyl chloride. (9) is the drum (1
The pivot shaft 0) is inserted and held by pivot rings 11 and 11 which are fitted and fixed to the central portions of the connecting members 8 and 8 respectively.

The wing plate (2) is formed by bending a substantially C-shaped thin plate as shown in FIG. 4 in two fold curves (a) and (a) shown by broken lines in FIG. A substantially fan-shaped outlet blade portion (5) and an inlet blade portion (6) projecting in opposite directions to each other are formed on both sides of the partition plate portion (4). In this case, the folding curves (a) and (a) are different from the above-described conventional parallel folding curves (b) and (b) indicated by phantom lines in FIG. Recess (4a)
Are set so as to narrow the mutual interval on the side having the outer edge (2).
a) It is narrower than the side.

Thus, 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 by twisting the partition plate (4). The outer edge (2a) is fitted to (12) and fixed by an adhesive, and the outlet blade (5) and the inlet blade (6) face the drum end face and are on the inner periphery of the drum body (1). On the other hand, the partition plate (4) is spirally arranged, and the partition plate portion (4) is inclined and arranged in a twisted state as shown in FIG. The twist of the partition plate (4) is oriented so that the inclination angle of the drum peripheral side with respect to the axis of the drum (10) is larger than that of the drum center side.

The outlet blade (5) and the inlet blade (6) of each blade (2) are connected to the blades (2) whose edges (5a) and (6a) are adjacent when viewed from the drum axis direction. It is arranged so as to intersect the folding curve (a) at a predetermined interval based on the spiral arrangement of the two blades (5) and (6), and the drum edge side of each edge (5a) (6a) Are joined to the cross-shaped distal ends of the connecting members (8) and (8) via an adhesive. Thus, Ri shape der partition plate portion (4) and narrow drum center side of each slat (2), and on
As described above, the partition plate (4) is a drum on the outer edge side.
The inclination angle with respect to the axis of (10) is larger than that of the inner edge side.
The outlet blades (5) and the inlet blades (6) are inclined so that the center side of the drum end face is concave, since they are arranged in a twisted state so as to increase the size .

The outlet passage (3a) and the inlet passage (3b) of each weighing chamber (3) are connected to the respective edges (5a) of the outlet blade (5) and the inlet blade (6) of each blade (2). (6a)
Triangular opening (13), which is provided at the center of the drum from the intersection of the curve and the folding line (a) and directly communicates with the outside, and the two blades (5) at the periphery of the drum from the intersection.
(6) is constituted by a gap at a portion overlapping the partition plate portion (4) of the adjacent blade plate (2).

The drum (10) having the above structure is incorporated in a casing of a wet gas meter, and is immersed in the liquid up to a reference liquid level L indicated by a virtual line in FIGS. Each measuring chamber (3) communicates with each other at the center of the drum (10). However, since the reference liquid level L is higher than the highest communication level, the measuring chamber (3) is higher than the other measuring chambers on the liquid level. The liquid is sealed, and the volume is set to be equal in this sealed state. In the measurement, the outlet pipe (not shown) is connected to the drum cover (7) through the outlet pipe insertion hole (7a).
And above the liquid level between the blade (2) and the outlet blade (5) of the blade (2) to feed gas into the casing. The gas thus sent in is introduced into each of the measuring chambers (3) sequentially from the inlet passage (3b) on the liquid surface with the rotation of the drum (10),
Outlet passageway (3a) with movement of each measuring chamber (3) into the liquid
Is discharged from the casing through the blowing pipe, and the integrated gas flow rate value is measured from the rotation speed of the drum (10) during the feeding.

Here, the partition (4) of each blade (2)
Is arranged in a twisted state and has high rigidity and excellent bending resistance. Therefore, no bending due to liquid pressure or gas pressure occurs during the above measurement, and each measuring chamber (3) is always held at an equal volume, and high measurement accuracy is obtained. Can be secured. Further, since the partition plate portion (4) has high strength due to the above rigidity and is unlikely to be deformed with time, a change in the capacity of each measuring chamber (3) with time is suppressed, so that stable measurement accuracy can be obtained over a long period of time. Can be Further, the outlet blade section (5) and the inlet blade section (6) are narrowly inclined toward the center of the drum, and the exchangeability of the liquid and gas in the drum (10), that is, the flow of the liquid in and out, is good.
Fluctuations in the liquid level in the inside are reduced, the rotational load resistance of the drum (10) is also reduced, the pressure loss of the meter is reduced, and the accuracy of the instrument difference is improved. In addition, since the capacity of the measuring chamber (3) changes depending on the degree of twist of the partition (4), the capacity of the measuring chamber (3) can be finely adjusted by setting the degree of twist.

In the present invention, the drum body (1), the blade plate (2), and the connecting member (8) of the drum (10) 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 joined to the inner peripheral surface of the drum body (1) without passing through such a groove (12).

[0024]

According to the first aspect of the present invention, the partition plates of the blade plates which divide the inside of the drum into a plurality of measuring chambers have structurally high rigidity and excellent bending resistance, so Even when the plate is made of a hard synthetic resin, each measuring chamber is maintained at the same volume without bending due to liquid pressure or gas pressure during operation, and high measurement accuracy can be ensured without rotation 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 with time is suppressed, and a drum for a wet gas meter that can obtain stable measurement accuracy over a long period of time is provided. Also partition
The outer edge of the plate is larger than the inner edge with respect to the drum axis.
Because it is arranged in a twisted state so that it tilts sharply,
The inner edge of the partition plate is more axially oriented than the outer edge.
The dimensions are shortened, and both the outlet and inlet blades
Of the end face of the drum. For this reason
Substitution of liquid for gas in ram, i.e. the flow of liquid in and out
This reduces the rotational load resistance of the drum and reduces pressure loss.
Loss is smaller and higher measurement accuracy can be obtained.
You. Also, this wet gas meter drum may have the same configuration as a conventional general-purpose one, except that the partition plate portions of the respective blades are arranged in a twisted state. Can be manufactured. In addition, the capacity of the weighing chamber can be finely adjusted by setting the degree of twist of the partition plate portion, and when the capacity is changed, it is not necessary to largely change the used members and processing specifications. By the capacity of such metering chamber can be finely adjusted, so cut with setting the level position to the reference liquid level of the ideal, it is possible to obtain a high measurement accuracy.

According to the second aspect of the present invention, as the above-mentioned wet gas meter drum, the flow of liquid in and out is further improved , the liquid level fluctuation in the measuring chamber is reduced, the rotational load resistance is reduced, and the pressure loss of the meter is reduced. Can be reduced and more reliable
In addition, a high measurement accuracy can be obtained and an instrument accuracy can be improved.

According to the third 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 metallic one is 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 wet gas meter drum according to an embodiment of the present invention.

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

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

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

FIG. 5 is a front view of the blade plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drum body 2 ... Blade plate 3 ... Metering chamber 4 ... Partition plate part 5 ... Outlet blade part 6 ... Inlet blade part 10 ... Wet gas meter drum a ... Fold curve

Claims (3)

(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 that face each other face the drum end surface, the partition plate portion of each blade plate faces the drum axis on the outer edge side.
A drum for a wet gas meter, wherein the drum is arranged in a twisted state so that the inclination angle is larger than that of the inner edge side . 2. The blade plate is divided into a partition plate portion, an outlet blade portion, and an inlet blade portion, and the interval between two fold curves is a blade plate development shape.
2. In the state, it is set to be narrow toward the center of the drum.
A drum for a wet gas meter as described in the above. 3. 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.