JP2786822B2 - 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 A conventional wet gas meter drum has a cylindrical drum body (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 inlet blade part (101b) and an outlet blade part (101c) connected to both sides of the partition part (101a) and bent in opposite directions to each other. 101) are provided inside the drum cylinder (100) with respective inlet blades (101b) and outlet blades (101).
c) faces the open ends at both ends of the drum cylinder (100), and furthermore, the adjacent inlet blades (101b) and the outlet blades (101c) are overlapped at the outer periphery and not overlapped at the inner periphery. In this state, the four measuring chambers (105) partitioned by the blades (101) are formed inside the drum body by being displaced in the circumferential direction.

A drum cover (102) is attached to one end side (entrance 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 accommodated in a casing (not shown) with the drum shaft (104) held in a horizontal posture, and a central hole (102a) of the drum cover (102) is below the liquid level. The sealing liquid (L) is injected into the casing until immersion.

Then, a gas is introduced into the drum cover (100) through the gas conducting tube while a gas conducting tube (not shown) is inserted into the central hole (102a) of the drum cover (100). The introduced gas flows into one gas metering chamber (105) located above the liquid level, and an inlet (105b) formed between adjacent inlet blades (101b).
And the drum rotates due to the gas pressure. By the rotation of the drum, the gas is charged into the chamber, and the sealing liquid (L) is formed between the adjacent outlet blades (101c) so that the gas is replaced with the sealing liquid (L). Through the outlet (105c). Further, the drum rotates and the outlet portion (105
When c) appears on the liquid surface, the gas in the measuring chamber is released from the outlet (105c), and the gas is discharged from the inlet (105b).
The sealing liquid (L) flows into the room from. The gas released from the outlet (105c) is discharged into the casing and then discharged to the outside.

On the other hand, the gas introduced into the drum cover (100) sequentially enters the measuring chamber (105) appearing on the liquid level, and the same operation as described above is repeated.

In this manner, the gas is discharged while being divided into the respective measuring chambers (105), 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.

[0009]

By the way, in a conventional wet gas meter drum, a drum cylinder (1) shown in FIG.
00), the outlet blade (101c)
The opening angle (α2) of the inlet blade (101b) with respect to the direction perpendicular to the drum axis is formed to be larger than the opening angle (α1) of the inlet blade (101b) with respect to the direction perpendicular to the drum axis.
In order to reduce the fluid resistance, the pressure loss is reduced and the measurement accuracy is improved.

However, if the opening angle (α1) of the outlet blade (101c) is formed to be larger than the opening angle (α2) of the inlet blade (101b), it is natural that the inlet (105b) and the outlet Since the opening area and the opening shape of (105c) are different, the fluid resistance differs between the inflow and the outflow of the sealing liquid (L). There is a problem in that the ingress and egress cannot be performed smoothly, which causes uneven rotation and lowers the measurement accuracy.

Further, in the conventional drum, the inlet (105b) and the outlet (105c) depend on the rotation angle.
The sealing liquid (L) may flow in and out from the inner peripheral side of the drum at a stretch, and at this time, the level of the sealing liquid (L) in the drum fluctuates. Had the problem of

It is an object of the present invention to provide a drum for a wet gas meter which can solve the above-mentioned problems of the prior art and can maintain a high measurement accuracy.

[0013]

In order to achieve the above object, a first aspect of the present invention provides a cylindrical drum body and an inlet blade and an outlet blade on both sides of a partition plate which are bent in mutually opposite directions. And a plurality of blade plates provided so that each blade plate has an inlet blade portion and an outlet blade portion facing the open ends at both ends of the drum body inside the drum body. In the state of being immersed in the sealing liquid up to a predetermined liquid level, the sealing liquid and the sample gas to be replaced therewith, with the rotation of the drum,
The wet gas meter drum, wherein the gas flows into the measuring chamber between the inlet blade and the outlet blade through the inlet between the adjacent inlet blades, and is discharged from the outlet between the adjacent outlet blades. The gist is that the inlet and the outlet have the same shape and the same area.

In the first aspect of the present invention, it is preferable to employ a configuration in which a bubble-extinguishing projection projecting in the circumferential direction is formed at a circumferential edge of the outlet blade.

In order to achieve the above object, a second invention of the present application is provided with a cylindrical drum cylinder and an inlet blade and an outlet blade provided on both sides of a partition plate so as to be bent in mutually opposite directions. A plurality of blades, and inside the drum body,
Each blade plate is arranged so as to be shifted in the circumferential direction in a state where the respective inlet blade portion and the outlet blade portion face the opening portions at both ends of the drum cylinder, and the liquid is sealed to a predetermined liquid level. In the immersed state, the sealed liquid and the sample gas to be replaced with the sealed liquid flow with the rotation of the drum, flow into the measuring chamber between the inlet blade and the outlet blade through the inlet between the adjacent inlet blades, In a wet gas meter drum that is discharged from the outlet between adjacent outlet blades,
The inlet-side partition disk formed so that the outer peripheral edge is higher than the predetermined liquid level, so that the center thereof is aligned with the drum axis, and the inner peripheral side of the inlet is closed. An outlet-side partition disk, which is provided on the outer surface side of the inlet blade portion and whose outer peripheral edge is formed to have a size higher than the predetermined liquid level, with its center aligned with the drum axis, The gist is that it is provided on the outer surface side of the outlet blade so as to close the inner peripheral side of the outlet.

In the second aspect of the present invention, it is preferable to adopt a configuration in which liquid passage holes are formed below the reference liquid level in the inlet and outlet partition disks.

Further, in the second invention, a configuration is adopted in which a bubble-extinguishing projection projecting in the circumferential direction is formed at a circumferential edge of the outlet blade portion.
More preferred.

[0018]

In the first aspect of the present invention, the inlet between the adjacent inlet blades and the outlet between the adjacent outlet blades are formed to have the same shape and the same area. Since the sealing liquid passes through the opening having the same shape and the same area and enters and exits the drum, it is possible to balance the fluid resistance of the sealing liquid at the inlet and the outlet, and to rotate the drum. Unevenness can be effectively prevented.

In the wet gas meter drum according to the second aspect of the present invention, the inner peripheral sides of the inlet and the outlet are closed by a partition disk protruding above the liquid level of the sealed liquid. The sealing liquid does not flow in and out at once, so that the sealing liquid can be smoothly moved in and out and the liquid level fluctuation can be suppressed.

In the second invention, when a sealing liquid passage hole is formed at a position below the reference liquid level of the partition disk, the sealing liquid passes through the hole so that the sealing liquid enters and exits the drum. The fluid resistance at the time is appropriately reduced, and the rotation of the drum is performed more smoothly.

In the first or second aspect of the present invention, in the case where the bubble extinction projection is formed on the circumferential edge of the outlet blade, the edge of the outlet blade may rise when rising from the liquid surface. Before the generated bubbles grow large, they come into contact with the bubble disappearing projections and disappear, preventing the bubbles from bursting.
The rotation of the drum is performed even more smoothly.

[0022]

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 (a) is a side sectional view of the drum, and FIG. ) Is a rear view of the drum. As shown in these figures,
The drum for a wet gas meter has a cylindrical drum body (1) made of stainless steel or the like, and four blades (2) also arranged inside the drum body.

As shown in FIG. 3A, each blade (2)
Is formed in a substantially sector shape, and is bent at equal angles in mutually opposite directions in a two-dot chain line in the same figure, thereby forming a central partition plate portion (2) as shown in FIG.
The inlet blade (22) and the outlet blade (2) are provided at both ends of 1).
3) is formed. The inlet blade (22) and the outlet blade (23) are configured to be substantially symmetrical to each other.

Each blade plate (2) is formed with a plurality of bubble eliminating projections (2a) on the outer peripheral side of one circumferential edge (23a) of the outlet blade portion (23).

Then, four blades (2) of this shape
However, each of the inlet blades (22) and the outlet blades (23) face the open ends of the drum body (1), and further adjacent inlet blades (22) and outlet blades (23). Are overlapped on the outer peripheral side and are displaced by 90 degrees in the circumferential direction in a state where they are not overlapped on the inner peripheral side, so that the inside of the drum body (1) is divided by the blade plate (2). Thus, four measuring chambers (3) are formed along the circumferential direction. At this time, as described above, the bending angles of the inlet blade portion (22) and the outlet blade portion (23) with respect to the partition plate portion (21) are set to be equal to each other, and therefore, as shown in FIG. 22) and the opening angle (α3) (α4) of the outlet blade portion (23) with respect to the direction perpendicular to the drum axis are equal to each other, so that the gap size between the adjacent inlet blade portions (22) and the adjacent thick outlet blade portion (23). ) Are the same. That is, the inlet portion (3) formed by the gap between the adjacent inlet blade portions (22).
2) and the outlet portion (33) formed by the gap between the adjacent outlet blade portions (23) have the same shape and the same area as each other in a side view state.

As shown in FIGS. 1 and 2, a drum shaft (5) is arranged along the axis of the drum having the above-described structure, and the drum shaft (5) has a drum inlet side (front side) and an outlet side. Partition disks (6) and (7) serving also as drum washers (drum plate) are fixed to the (rear side), and each of the disks (6) and (7) is connected to an inlet blade (22) and an outlet. The drum is fixed to the outer surface of the blade portion (23), and the drum is supported on the drum shaft (5).

Each of the partition disks (6) and (7) has such a size that a part of the outer peripheral edge is always higher than a reference liquid level to be described later, and the inlet blades (22) do not overlap each other. , And the outlet vanes (23) are formed in such a size that they can close portions where they do not overlap with each other. Further, as shown in FIG. 5 (a), at a position lower than the reference liquid level of the partition disks (6) and (7), a plurality of liquid passage holes (6a) are formed along the circumferential direction.
(7a) is formed. Since the outlet-side partition disk (7) is configured substantially the same as the inlet-side partition disk (6), in FIG. 3 shows the configuration of a plate (7).

On the other hand, a drum cover (4) having a gas passage pipe insertion hole (41) formed at the center is attached to the one end side opening part (entrance side opening part) of the drum body (1).

The shaft-equipped drum constructed as described above
While the drum shaft (5) is held in a horizontal posture, the drum shaft (5) is rotatably accommodated in the casing, and a gas conduit (not shown) is inserted and disposed in the gas conduit insertion hole (41) of the drum cover (4). You. Further, at the time of gas measurement, the sample gas is filled with the sealing liquid (L) such as water or oil having a low water vapor pressure in the casing until a predetermined liquid level (reference liquid level), that is, higher than the gas conduit insertion hole (41). Each measuring chamber (3) is injected to a liquid level that does not penetrate the inside of the drum, so that the gas measured by the sealing liquid (L) is sealed to the other measuring chambers (3) on the liquid level. ing. In this state, irrespective of the rotation angle of the drum, a part of the outer peripheral edge of the inlet-side and outlet-side partition disks (6) and (7) is always above the reference liquid level of the sealing liquid (L). It is located.

In this state, when a sample gas is introduced into the drum cover (4) through the gas conduit, the gas becomes
The gas enters the one measuring chamber (3) located above the liquid level from the inlet (32), and the drum rotates by the gas pressure.

As the drum rotates, the gas is charged into the chamber, and the sealing liquid (L) flows out of the outlet (33) so that the gas is replaced with the sealing liquid (L). At this time, since the partition disk (7) is arranged on the inner peripheral side of the outlet (33), most of the sealing liquid (L) is discharged from the outer peripheral side of the outlet (33), Part is a partition disk (7)
Is discharged from the inner peripheral side of the outlet portion (33) through the liquid passage hole (7a).

Subsequently, as the rotation of the drum proceeds, the measuring chamber (3) submerges from the inlet (32) side, and once the inside is sealed, the outlet (33) appears on the liquid surface. Further, as the measuring chamber (3) is submerged, the sealing liquid (L) flows into the chamber from the inlet (32) and is pushed out by the sealing liquid (L), so that the sample gas is discharged from the outlet. It is discharged into the casing through (33) and then discharged outside the casing. At this time, the entrance (32)
Since the partition disk (6) is arranged on the inner peripheral side of
Most of the sealing liquid (L) flows in from the outer peripheral side of the inlet part (32), and a part of the sealing liquid (L) passes through the sealing liquid passage hole (6a) of the partition disk (6).
And flows in from the inner peripheral side of the inlet portion (32).

On the other hand, with the rotation of the drum, the next measuring chamber (3) appears on the liquid surface, and the same operation as described above is performed on this measuring chamber (3). The same operation as described above is repeatedly performed on the weighing chamber (3) appearing in (1).

As described above, the gas is discharged while being sequentially divided into the respective measuring chambers (3), 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 this gas meter, the inlet (3
2) and the outlet part (33) are set to have the same shape and the same area as each other, and the partition disk (6) that closes the inner peripheral side outside the inlet part (32) and the outlet part (33).
Since (7) is attached, most of the sealing liquid (L) flows into the drum from the outer peripheral side of the inlet (32),
It will flow out from the outer peripheral side of the outlet part (33). In other words, the sealing liquid (L) passes through the openings having the same shape and the same area and enters and exits the drum, so that the sealing liquid (L) is formed at the inlet (32) and the outlet (33). 2), the fluid resistance can be balanced, the occurrence of uneven rotation in the drum can be effectively prevented, and the measurement accuracy can be improved.

Further, the inlet (32) and the outlet (3)
Since the inner peripheral side of 3) is closed by the partition disks (6) and (7), the sealing liquid (L) does not flow at once or is discharged at once, and the sealing liquid (L) does not flow. Can smoothly move in and out of the drum to suppress fluctuations in the liquid level, and in this regard, measurement accuracy can be improved.

In the drum of this embodiment, the sealing liquid passage holes (6a) and (7a) are formed at positions lower than the reference liquid level of the inlet and outlet partition disks (6) and (7). Since the sealing liquid (L) passes through the holes (6a) and (7a), the fluid resistance at the time of entering and exiting the sealing liquid (L) is moderately moderated, and the rotation of the drum is smoothly performed. In this respect, the measurement accuracy can be improved.
However, if the opening area of the sealing liquid passage holes (6a) and (7a) is too large, the effect of smoothly entering and exiting the sealing liquid (L) may be impaired, so that the opening is small enough not to impair the effect. It is necessary to form in the area.

Further, in this embodiment, since the bubble extinction projection (2a) is formed at the circumferential edge (23a) of the outlet blade (23), the generation of air bubbles can be reliably prevented. The measurement accuracy can be further improved. That is, in a normal drum having no projection (2a), the edge (23a) of the outlet blade (23) is formed.
However, when the liquid floats from the liquid surface, bubbles are generated between the edge (23a) of the outlet blade portion (23) and the liquid surface due to the effect of the surface tension of the sealing liquid (L), and the bubbles are generated by the drum. With the rotation of the drum, it gradually grows large toward the center of the drum along the edge (23a) and then bursts sharply. As a result, the drum causes uneven rotation and the measurement accuracy decreases. On the other hand, in the drum of this embodiment, since the sharp edge (23a) is formed at the edge (23a) of the outlet blade (23), the edge (23a) of the outlet blade (23) is formed.
When bubbles rise from the liquid surface, even if bubbles are generated,
Before the bubble grows, the bubble comes into contact with the projection (2a) and disappears. Since the burst of bubbles can be prevented in this manner, the rotation of the drum can be performed smoothly, and the measurement accuracy can be improved in this respect as well.

In this embodiment, the inlet blade (2
2) and the outlet blade (23) are formed symmetrically with each other, and the inlet blade (22) and the outlet blade (2) are formed.
Since the bending angle of the partition plate portion (21) with respect to the partition plate portion (3) is the same, the two blade portions (22) and (23) are arranged with each other, and the cross-sectional area of the gas passage of the both blade portions (22) and (23) is reduced. , Is set substantially constant over the entire circumference of the drum. For this reason, the sealing liquid (L) and the sample gas can flow in and out of the drum more smoothly, uneven rotation and liquid level fluctuation can be effectively prevented, and the measurement accuracy can be further improved.

In the present invention, the sealing liquid passage holes (6a) (7) of the inlet-side and outlet-side partition disks (6) (7) are used.
The shape and number of a) are not particularly limited. Further, as shown in FIG. 5B, a partition disk having no liquid passage hole may be used, or a partition disk having a hole and a partition disk having no hole may be used in combination. May be used.

In the above embodiment, a partition disk that also serves as a drum washer is used. However, in the present invention, a partition disk may be attached separately from the drum washer. .

Further, in the present invention, the number of the formed bubbles-extinguishing projections is not particularly limited.

[0043]

As described above, according to the wet gas meter drum of the first invention, the inlet between adjacent inlet blades and the outlet between adjacent outlet blades have the same shape and the same shape. Because it is formed in the area, the sealing liquid is
Passing through openings of the same shape and the same area,
Since the fluid enters and exits the drum, it is possible to balance the fluid resistance of the sealing liquid between the inlet and the outlet, and it is possible to effectively prevent the occurrence of rotation unevenness and improve the measurement accuracy. can get.

According to the wet gas meter drum of the second invention, the inner peripheral sides of the inlet and the outlet are closed by the partition disk protruding above the liquid level of the sealed liquid. As a result, the sealing liquid does not flow in and out at once, so that the sealing liquid can be smoothly moved in and out, the liquid level fluctuation can be suppressed, and the measurement accuracy can be improved.

In the second invention, when a sealing liquid passage hole is formed at a position lower than the reference liquid level of the partition disk, the sealing liquid passes through the hole so that the sealing liquid enters and exits the drum. Since the fluid resistance at the time is appropriately reduced, and the rotation of the drum is performed more smoothly, there is an advantage that the measurement accuracy can be further improved.

In the first or second aspect of the present invention, in the case where the bubble extinction projection is formed at the circumferential edge of the outlet blade, when the edge of the outlet blade rises from the liquid surface. Before the generated bubbles grow large, they come into contact with the bubble disappearing projections and disappear, preventing the bubbles from bursting.
Since the rotation of the drum is performed even more smoothly,
There is an advantage that the measurement accuracy can be further improved.

[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 view showing a drum according to the embodiment, and FIG.
Is a side sectional view, and FIG. 2B is a rear view.

3A and 3B are diagrams showing a blade plate in the drum of the embodiment, wherein FIG. 3A is a plan view in an expanded state, and FIG. 3B is a side view in a bent state.

FIG. 4 is a development view of a drum barrel in the drum of the embodiment.

FIG. 5A is a front view showing a partition disk applied to the drum of the embodiment, and FIG. 5B is a front view showing a partition disk applicable as a modification of the present invention.

FIG. 6 is a perspective view showing a conventional wet gas meter drum with a part thereof cut away.

7A and 7B are views showing a conventional drum, wherein FIG. 7A is a side sectional view, and FIG. 7B is a front view showing a state in which a drum cover is removed.

FIG. 8 is a development view of a drum body in a conventional drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drum cylinder 2 ... Blade plate 2a ... Protrusion for bubble elimination 3 ... Measuring chamber 6, 7 ... Partition disk 6a, 7a ... Liquid sealing passage hole 21 ... Partition plate part 22 ... Inlet blade part 23 ... Outlet blade part 23a ... One edge 32 ... Inlet 33 ... Outlet L ... Liquid sealing

Claims (5)

(57) [Claims] 1. A drum body comprising: a cylindrical drum body; and a plurality of blade plates provided on both sides of a partition plate such that an inlet blade portion and an outlet blade portion are bent in mutually opposite directions. Inside, each vane plate is arranged so as to be displaced in the circumferential direction in a state where the respective inlet vanes and outlet vanes face the open ends of the drum body at a predetermined liquid level. In a state immersed in the sealing liquid, the sealing liquid and the sample gas to be replaced with the sealing liquid pass through the inlet between the adjacent inlet blades with the rotation of the drum, and the measuring chamber between the inlet blade and the outlet blade. The wet-type gas meter drum is configured such that the inlet portion and the outlet portion are set to have the same shape and the same area as each other. For wet gas meter Beam. 2. The wet gas meter drum according to claim 1, wherein a bubble-extinguishing projection projecting in the circumferential direction is formed at a circumferential edge of the outlet blade. 3. A drum body comprising: a cylindrical drum body; and a plurality of blade plates provided on both sides of a partition plate such that an inlet blade portion and an outlet blade portion are bent in mutually opposite directions. Inside, each vane plate is arranged so as to be displaced in the circumferential direction in a state where the respective inlet vanes and outlet vanes face the open ends of the drum body at a predetermined liquid level. In a state immersed in the sealing liquid, the sealing liquid and the sample gas to be replaced with the sealing liquid pass through the inlet between the adjacent inlet blades with the rotation of the drum, and the measuring chamber between the inlet blade and the outlet blade. , And discharged from an outlet between adjacent outlet blades, the inlet-side partition disk formed so that an outer peripheral edge thereof is higher than the predetermined liquid level. But the center was aligned with the drum axis In this state, an outlet-side partition circle is provided on the outer surface of the inlet blade so as to close the inner peripheral side of the inlet, and has an outer peripheral edge higher than the predetermined liquid level. A drum for a wet gas meter, wherein a plate is provided on an outer surface side of the outlet blade portion so as to close an inner peripheral side of the outlet portion in a state where the plate is aligned with a drum axis. 4. The drum for a wet gas meter according to claim 3, wherein sealing liquid passage holes are respectively formed at positions lower than a reference liquid level in the inlet-side and outlet-side partition disks. 5. The wet gas meter drum according to claim 3, wherein a bubble-extinguishing projection projecting in the circumferential direction is formed at a circumferential edge of the outlet blade.