JP2644670B2 - 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 used for measuring a gas flow rate.

[0002]

2. Description of the Related Art As shown in FIGS. 7 to 10, a conventional drum for a wet gas meter has a cylindrical drum cylinder (10).
0) and four blades (10) arranged inside the drum body.
1).

Each of the blades (101) is provided with a partition plate (101).
a) and an outlet blade part (101b) and an inlet blade part (101c) provided on both sides of the partition part (101a) and bent in opposite directions to each other.
b) The angle (α) (see FIG. 10) of (101c) with the partition plate portion (101a) is set to about 135 degrees.

[0004] Each of the blades (101) is provided inside the drum body (100) with a respective outlet blade (101).
b) and the inlet blade (101c) are connected to the drum cylinder (10).
The four measuring chambers (105) are formed inside the drum body while being shifted from each other in the circumferential direction in a state of facing the open ends at both ends of the drum body.

A drum cover (102) is attached to one end (outlet side) of the drum body (100), and a drum shaft (104) is attached along the axis of the drum body (100). Have been.

The drum is rotatably housed in a casing (not shown) with the drum shaft (104) held in a horizontal position, and the center hole (102a) of the drum cover (100) is below the liquid level. The sealing liquid (L) is injected into the casing until immersion.

Then, gas is introduced into the casing with a gas conduit (not shown) inserted into the central hole (102a) of the drum cover (100). The introduced gas is introduced into one gas metering chamber (105) above the liquid level by an inlet (105) formed between the blades at the other end of the drum.
b) penetrate and rotate the drum by gas pressure. By the rotation of the drum, the gas is filled into the room, and is replaced with the gas.
Flows out of the measuring chamber through an outlet (105a) formed between the blades at one end of the drum. When the drum further rotates and the outlet (105a) appears on the liquid surface, gas in the measuring chamber is released from the outlet (105a), and is replaced with the gas so as to replace the gas in the inlet (10a).
From 5b), the sealing liquid (L) flows into the room. And
The gas released from the outlet (105a) is discharged to the outside of the casing through the gas conduit.

On the other hand, the gas introduced into the casing is:
It sequentially enters the measuring chamber (105) that appears on the liquid level,
The same operation as described above is repeated.

In this way, the gas is discharged while being divided into the respective measuring chambers (105) sequentially, and the gas of four measuring chambers is discharged by one rotation of the drum. Therefore,
The gas flow rate can be measured by integrating the number of rotations of the drum.

In such a gas meter, when the flow rate increases and the rotation speed of the drum increases, the outflow of the sealed liquid (L) from the measurement chamber (105) cannot keep up with the rotation of the drum, and The liquid level in the room rises and the measuring chamber (10
The capacitance of 5) gradually changes greatly, that is, a so-called right-down phenomenon of the instrumental error occurs, which causes a decrease in measurement accuracy. For this reason, conventionally, for example, a measuring chamber (10
The outlet (105a) of (5) is formed larger than the inlet (105b), so that the sealing liquid (L) can be satisfactorily discharged from the measuring chamber (105), or a water level gauge or a level can be used. The accuracy of the measurement was improved to improve the accuracy of setting the liquid level, thereby preventing the measurement accuracy from lowering.

[0011]

However, in the above-mentioned conventional single drum, that is, one cylindrical body (drum body)
Is partitioned by a blade plate (101), the liquid surface exists in the entire lower surface of the measuring chamber (105) located on the liquid surface, so that the liquid surface area in the measuring chamber (105) is large, The influence of the position fluctuation on the instrumental difference becomes large. Therefore, even if the liquid level fluctuation is suppressed by the above-described means, a slight liquid level fluctuation occurs, so that the fluctuation greatly changes the instrumental difference, and can sufficiently prevent a decrease in measurement accuracy. Was not.

On the other hand, even if there is some fluctuation in the liquid level, a decrease in measurement accuracy can be prevented if the influence on the instrumental difference is small. Therefore, as such a gas meter drum,
For example, an improved version of Japanese Patent No.
A double-drum type disclosed in Japanese Patent No. 21820 has been proposed.

The former double drum has two drums inside the drum body.
The two inner cylinders are arranged at intervals on the drum axis, and a measuring chamber is formed between the drum body and the inner cylinder, so that the sealed liquid enters and exits the measuring chamber between the two inner cylinders. It was made. In this drum, the liquid surface area in the chamber can be reduced by the amount that both inner cylinders protrude above the liquid level in the measuring chamber, and the influence of the liquid level fluctuation on the instrumental difference can be reduced.

However, this double drum requires two inner cylinders, and further requires a projection for preventing gas penetration on the partition plate of the blade plate, so that the structure becomes very complicated. For this reason, the cost increases, the assembly error and the pressure loss also increase, and high accuracy cannot be obtained.
It is not currently manufactured.

As shown by the imaginary line in FIG. 9, the latter double drum has a hermetically sealed inner cylinder (150) inside a drum body (100) in a conventional single drum configuration. ) Is arranged, and a measuring chamber is formed in an annular space between the drum body (100) and the inner cylinder (150).

In this drum, since the inner cylinder protrudes above the liquid surface, the influence of the liquid level fluctuation on the instrumental difference is reduced.
While it is possible Rukoto is, the outlet of the metering chamber (105) for those with intact inner cylinder to the structure of the simplex drum (150) is arranged, which is formed by between vane outlet portion adjacent (101b) In the portion (105a), the amount of circumferential intersection between the adjacent outlet blades (101b) is increased, and the dimension between the outlet blades (101b) is also reduced, so that the sealing liquid (L) is removed from the outlet (105a). ) Cannot be passed smoothly, resulting in poor gas-liquid substitution. Furthermore, since the inner cylinder (150) is hermetically sealed, the sealed liquid cannot pass through the inner cylinder, and the circulation of the sealed liquid is not performed smoothly. For this reason, it is possible to measure a very small amount of gas, such as when the drum is rotating at a very low speed.However, if the rotation of the drum is slightly increased, the liquid level will fluctuate rapidly and the instrumental variation will change. At present, it cannot withstand normal use and has not yet been put to practical use.

According to the present invention, in view of the above-described situation, the sealing liquid can be smoothly moved in and out of the measuring chamber, and the liquid replacement property can be improved. An object of the present invention is to provide a drum for a wet gas meter which can stably maintain measurement accuracy and can be manufactured at low cost.

[0018]

In order to achieve the above-mentioned object, the present invention provides an inner cylinder which is coaxially arranged inside an outer cylinder to form an annular space between the two cylinders. and the partition plate portion, a plurality of vanes having its both sides is provided continuously to be bent in phase互逆direction the vane outlet portion and inlet vane section,
The annular space is displaced in the circumferential direction in a state where the respective outlet blades and the inlet blades face the open ends of the annular space, respectively. is divided to a plurality drum for wet gas meter metering chamber Ru is formed by the front
Partition plate for outlet and inlet blades of the above-mentioned blade
Angle to the outer cylinder (drum body) when deployed
Is set to 140 ° or more, and the adjacent exit blades
And the inlet blades are spaced apart in the drum axis direction.
With the outer cylinder side in the circumferential direction
The gist is arranged so as to be circumferentially separated on the inner cylinder side .

In this case, the end surface or the inside of the inner cylindrical body is closed by a closing member, and the inner cylindrical body is closed by the closing member at a position equal to or lower than the reference liquid level.
Preferably, a through hole is formed.

[0020]

In the wet gas meter drum according to the present invention, the inner cylinder is disposed inside the outer cylinder, and the gas measuring chamber is formed in the annular space between the two cylinders. The liquid surface area in the chamber can be reduced by an amount corresponding to the protrusion of the cylinder above the liquid surface, and the influence on the measuring chamber capacity (instrument difference) due to the liquid level fluctuation can be reduced.

Further, it is set such that the angle between the partition plate portion of the vane outlet portion and inlet vane section at the blade plate becomes relatively large as 140 degrees or more, the exit blade portions and the vane inlet portions adjacent Spaced in the drum axis direction
In the circumferential direction on the outer cylinder side, and
Adjacent outlets because they are separated in the circumferential direction
The outlet section and the inlet section of the measuring chamber formed between the blade sections and between the adjacent inlet blade sections are formed in a desired shape.
This makes it possible to smoothly move the sealing liquid in and out of the measuring chamber.

Further, in the present invention, when a through hole is formed in the closing member of the inner cylinder, the sealed liquid moved from the inlet side to the outlet side of the drum through the measuring chamber below the liquid level is removed. It is possible to smoothly return to the drum inlet side through the through hole and the inside of the inner cylinder.

[0023]

FIG. 1 is a perspective view showing a wet gas meter drum according to an embodiment of the present invention with a part thereof cut away, FIG. 2 is a side sectional view of the drum, and FIG. Front view showing the drum with its drum cover removed,
FIG. 3B is a rear view. As shown in these figures,
This wet gas meter drum comprises an outer cylinder (1) constituting a drum body, an inner cylinder (2) arranged coaxially inside thereof, and an annular space (5) between the two cylinders. 4) placed in
Each of these members (1), (2) and (3) is made of a transparent hard synthetic resin such as vinyl chloride.

A drum cover (4) made of a transparent hard synthetic resin such as vinyl chloride is mounted on one end side (outlet side) of the outer cylindrical body (1). A gas conduit insertion hole (4a) is formed at the center of the hole.

The inner cylindrical body (2) is formed to be more unitary than the outer cylindrical body (1), and has a closing member (21) made of a transparent hard synthetic resin such as vinyl chloride at both axial openings. (2
2) is attached. The closing member (21) on one side (outlet side) has a drum shaft mounting hole (21a) in the center.
Is formed, and around the hole (21a),
Four through holes (21b) are formed below the through liquid level (the liquid level at which gas cannot pass through and cannot be measured) to allow passage of the sealing liquid (L).

A drum shaft mounting hole (22a) is formed in the other end member (inlet side) in the same manner as described above, and an inner cylindrical body is formed around the hole (22a) when the gas meter is in operation. In (2), a through-hole (22b) is formed to allow the flow of gas into the casing described later and the passage of the sealing liquid (L).

As shown in FIG. 4, each of the blades (3) is formed in a substantially C-shape in plan view, and is indicated by a two-dot chain line (x).
In (x), the outlet blade (32) and the inlet blade (33) are continuously provided at both ends of the central partition plate (31) by being bent in opposite directions at a predetermined angle described in detail. It is formed.

Then, four blades (3) of this shape are
As shown in FIGS. 1 to 3, in a state where the respective outlet blades (32) and the inlet blades (33) face the open ends on both ends of the annular space, the positions are set at 90 degrees in the circumferential direction. By being displaced, the annular space (5) is divided by the blades (3), and four measuring chambers (51) are formed so as to be arranged in the circumferential direction.

In this case, as shown in a developed view of the outer cylindrical body (1) in FIG. 5A and a developed view of the inner cylindrical body (2) in FIG. 5B, the outlet blade in the blade plate (3) is shown. Part (32) and the inlet blade part (33) form an angle (α) with the partition plate part (31).
Are set to be relatively large, such as 140 degrees or more, preferably 150 degrees or more. Thereby, as shown in FIG. 3, adjacent outlet blades (32) and inlet blades (33) are spaced apart in the drum axis direction.
In There state, in the outer cylindrical body (1) side to suit intersects the circumferential direction, the inner cylinder (2) side can be spaced apart in the circumferential direction, the outlet of the metering chamber (51) (52) and Entrance (5
In 3), the intersection area of the blades (32) and (33) is
Each time, the outlet (52) and the inlet (53)
It can be formed in a desired shape.

The drum having such a configuration is rotatably accommodated in a casing with the drum shaft (6) fixedly inserted through the drum shaft mounting holes (21a) (22a) held in a horizontal posture. At the same time, a gas conduit not shown is inserted and arranged in the gas conduit insertion hole (4a) of the drum cover (4). Further, at the time of gas measurement, a sealing liquid (L) such as water or oil having a low water vapor pressure is injected into the casing to a predetermined liquid level, and each measuring chamber (51) is placed above the other measuring chamber (51) on the liquid level. ), The gas measured by the sealing liquid (L) is sealed, and is set to have the same volume in this sealed state.

Here, since the measuring chamber (51) is formed in the annular space (5) between the outer cylinder (1) and the inner cylinder (2) disposed inside the outer cylinder (1), The liquid surface area in the measuring chamber (51) is reduced by the amount that the body (2) protrudes above the liquid surface, and the influence on the measuring chamber capacity (instrument difference) due to the liquid level fluctuation is reduced. Therefore, even if a slight change in the liquid level occurs, the change in the instrumental error is reduced, and the measurement accuracy is not reduced.

When a gas is introduced into the casing with the sealing liquid (L) injected into the casing, the gas is introduced into one of the measuring chambers (51) located above the liquid level at the inlet (53). ) And rotate the drum by gas pressure.

As the drum rotates, the gas is filled into the chamber, and the sealed liquid (L) flows out of the outlet (52) so as to replace the gas. Further, as the rotation of the drum proceeds, the measuring chamber (51) submerges from the inlet (53) side, and once the inside is sealed, the outlet (5).
2) appears. Further, as the metering chamber (51) is submerged, the gas in the chamber is discharged into the drum cover (4) through the outlet part (52) so as to be replaced with the sealing liquid (L). Gas is discharged to the outside of the casing through the gas conduit.

Here, as described above, the angle (α) of the outlet blade (32) and the inlet blade (33) with respect to the partition plate (31) is compared with 140 ° or more. The outlet (5) of the weighing chamber (51)
2) In the circumferential direction between the outlet blades (32) adjacent to each other at the inlet (53) and between the inlet blades (33).
The intersection area can be reduced, and the outlet blade (32)
A large dimension in the drum axis direction between the gaps and between the inlet blades (33) can be secured. Therefore, the sealing liquid (L) enters and exits the measuring chamber (51) smoothly, the fluctuation of the liquid level is reduced, and the measurement accuracy can be maintained at a high level.

The closing member (21) for the inner cylinder (2)
(22) has a through hole (21) for allowing the passage of the sealing liquid (L).
b) Since (22b) is formed, below the liquid level,
The sealing liquid (L) moved from the drum inlet side to the outlet side through the measuring chamber (51) is smoothly returned to the drum inlet side through the through holes (21b) and (22b) and the inside of the inner cylinder. As a result, it is possible to prevent a sharp liquid level fluctuation and a liquid flow from occurring, and it is possible to obtain a higher measurement accuracy. Furthermore, the through-hole (22) of the closing member (22) on the other side
Since the gas flows into the inner cylinder (2) via b), buoyancy is generated in the inner cylinder (2) by the inflowing gas and acts on the bearing of the drum shaft (6). The load on the cylinder (2) can be reduced.

On the other hand, with the rotation of the measuring chamber (51), the next measuring chamber (51) appears on the liquid surface, and the same operation as described above is performed on this measuring chamber (51). The same operation is repeatedly performed on the measuring chambers that appear on the liquid surface.

As described above, the gas is discharged while being sequentially divided into the respective measuring chambers (51), and one rotation of the drum discharges the gas for the four measuring chambers. Therefore, the gas flow rate can be measured by integrating the number of rotations of the drum.

According to the gas meter drum, since excellent liquid replacement property is provided and the influence of the liquid level fluctuation on the instrumental difference is small, high measurement accuracy can be stably maintained. further,
Only one inner cylinder (2) is required, the structure is simple, the cost can be reduced, and the mounting error and
Since an increase in pressure loss can be prevented, measurement accuracy can be improved in this respect as well.

Further, the capacity of the measuring chamber (51) can be easily finely adjusted only by changing the angles (degrees of bending) of the outlet blade (32) and the inlet blade (33) with respect to the partition (31). can do. Further, by appropriately changing the degree of bending, the liquid surface pressure receiving area in the measuring chamber (51) can be changed. For example, if the pressure receiving area is increased, a large rotational driving force can be given to the drum, and the rotational unevenness can be increased. Etc. can be prevented.

Also, by changing the degree of bending, the dimensions between the outlet blades (32) and between the inlet blades (33) can be changed, and the outlet (52) and the inlet (5) can be changed.
3) The opening size can be changed as appropriate. For this reason, if necessary, for example, if the opening size of the inlet portion (53) is set smaller and that of the outlet portion (52) is set larger, it is possible to make the entrance and exit of the sealed liquid to the measuring chamber more smoothly. it can.

Further, as described above, a large rotational force can be applied to the drum, and the sealing liquid can be smoothly moved in and out of the measuring chamber. Therefore, while maintaining high accuracy, the capacity of the drum measuring section can be reduced. Therefore, the trace gas can be measured with high accuracy and in a short time.

By the way, the wet gas meter to which the drum of the present embodiment is applied can secure higher measurement accuracy only by making a simple design change.

That is, as shown in the horizontal sectional view of FIG. 6 (a), in the gas meter to which the drum of the above embodiment is applied, the inflow side gas chamber in the casing (60) is provided outside the drum and inside the cylinder. The outflow side gas chamber is formed inside the drum cover (4) while being formed by the inside of (2). Then, the lower left diagonal line (Si)
The liquid surface area of the inflow-side gas chamber (inflow-side pressure-receiving area) indicated by (excluding the hatched line indicating the cross section of the drum) and the downward-sloping oblique line (S
o) By appropriately setting the ratio to the liquid surface area (outflow side pressure receiving area) of the outflow side gas chamber indicated by (excluding the oblique line indicating the cross section of the drum), the change in instrumental difference is effective against the fluctuation of flow. And high measurement accuracy can be ensured. Therefore, as shown in FIG. 6B, the mounting position of the closing member (21) on one side of the inner cylinder (2) is shifted to the other end, so that the pressure receiving area ratio between the inflow side and the outflow side is reduced. Can be changed, and an appropriate area ratio can be obtained.
In this case, as shown in FIG. 6C, by replacing the mounting positions of the one-side closing member (21) and the other-side closing member (22), the inflow side pressure receiving area (So) with respect to the outflow side pressure receiving area (So). The area (Si) can be maximized.

In the above embodiment, the outer cylinder (1), the inner cylinder (2), the blade plate (3), the drum cover (4) and the like are made of synthetic resin. Is not particularly limited, and may be made of metal or the like using sheet metal processing, a casting method, or the like.

Further, in order to enhance the mounting position accuracy of the blade plate (3) and the workability during assembly, the blade plate fixing position on the inner peripheral surface of the outer cylindrical body (1) and the outer peripheral surface of the inner cylindrical body (2). A structure in which a groove is formed in advance and the outer edge of the blade plate (3) is fitted in the groove may be adopted.

In the above embodiment, the drum is used on the drum cover (4) side as the gas outlet side. However, the drum cover side may be used as the gas inlet side.

[0047]

As described above, according to the wet gas meter drum of the present invention, the inner cylinder is disposed inside the outer cylinder, and the gas measuring chamber is formed in the annular space between the two cylinders. Therefore, the liquid surface area in the measuring chamber is reduced by the amount of the inner cylinder projecting above the liquid surface, and the influence on the measuring chamber capacity (instrument difference) due to the liquid level fluctuation is reduced. Further, the angle between the exit blade portion and the entrance blade portion of the blade plate with respect to the partition plate portion is set to one.
It is set to be relatively large at 40 degrees or more, and the adjacent outlet blades and the inlet blades are aligned with the drum axis direction.
In the circumferential direction on the outer cylinder side with the
Because Align Te, and circumferentially away septum is allowed in the inner cylinder side, next
Between the matching outlet blades and between adjacent inlet blades
Shape the outlet and inlet of the weighing chamber to the desired shape
This makes it possible to smoothly move the sealing liquid in and out of the measuring chamber, thereby reducing pressure loss.
As described above, since the influence of the liquid level fluctuation on the measuring chamber capacity (instrument difference) is small and the pressure loss is low, it is possible to obtain an effect that high measurement accuracy can be stably maintained.

In the case where a through hole is formed in the closing member of the inner cylinder, the liquid sealed from the inlet side to the outlet side of the drum through the measuring chamber under the liquid level is filled with the through hole. Can be smoothly returned to the drum entrance side via
There is an advantage that a drastic fluctuation of the liquid level and liquid flow can be prevented, and a higher measurement accuracy can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a wet gas meter drum according to an embodiment of the present invention, with a part thereof cut away.

FIG. 2 is a side sectional view showing the drum of the embodiment.

FIG. 3 is a front and back side view showing the drum of the embodiment with its drum cover removed.

FIG. 4 is a plan view showing a blade plate in the drum of the embodiment.

FIG. 5 is a development view of the inner and outer cylinders in the drum of the embodiment.

FIG. 6 is a schematic horizontal sectional view showing a gas meter to which the drum of the embodiment is applied.

FIG. 7 is a perspective view showing a conventional wet gas meter drum with a part thereof cut away.

FIG. 8 is a side sectional view showing a conventional drum.

FIG. 9 is a front view showing a conventional drum with its drum cover removed.

FIG. 10 is a perspective view showing a blade plate in a conventional drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer cylinder body 2 ... Inner cylinder body 3 ... Blade plate 5 ... Annular space 21, 22 ... Closure member 21b, 22b ... Through hole 31 ... Partition plate part 32 ... Exit blade part 33 ... Inlet blade part 51 ... Metering chamber alpha …angle

Claims (2)

(57) [Claims] We claim: 1. inner cylinder is arranged coaxially inside the outer cylinder, while the annular space is formed between the two cylindrical bodies, and the partition plate portion, the phase is continuously provided on both sides互逆A plurality of blade plates having an outlet blade portion and an inlet blade portion bent in the direction, with the respective outlet blade portion and the inlet blade portion facing the annular space, respectively, facing both open ends of the annular space. so,
By being staggered circumferential positions, wherein the annular space is divided by the vane a plurality drum for wet gas meter metering chamber Ru is formed of, vane outlet portion and inlet vane in the vane plate Division of department
The angle with respect to the plate portion is 140 ° when the outer cylinder is deployed.
With the above settings, the adjacent outlet blades and the inlet
With the blades spaced apart in the drum axis direction,
The outer cylinder side intersects in the circumferential direction and the inner cylinder
A drum for a wet gas meter, which is arranged so as to be circumferentially separated on a body side . 2. The inner cylinder body has an end face or an inside closed by a closing member, and a through hole is formed in the closing member at a position equal to or lower than a reference liquid level. 2. The drum for a wet gas meter according to 1.