JP2843268B2 - 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 Conventionally, as a wet gas meter drum, for example, as shown in FIGS. 6 and 7, a plurality of bent blade plates (101) are formed inside a cylindrical drum body (100). Are mainly used.

This drum is provided with four blades (101), and each blade (101) is provided with a partition (101).
a), and an inlet blade part (101b) and an outlet blade part (101c) connected to both sides of the partition plate part (101a) and bent in mutually opposite directions. And
Each of the blades (101) is provided inside the drum body (100).
The respective inlet blades (101b) and outlet blades (101c) face the open ends at both ends of the drum body (100), and are displaced in the circumferential direction. Four measuring chambers (105) are formed which are partitioned by the blades (101).

[0004] On one end side of the drum cylinder (100),
A drum cover (102) is attached, and a drum shaft (104) extends along the axis of the drum body (100).
Is attached.

The drum is rotatably accommodated in a casing (not shown) with the drum shaft (104) held in a horizontal position, and a gas passage (not shown) is provided in a central hole (102a) of the drum cover (100). A tube is inserted and placed.

At the time of gas measurement, the sealing liquid (L) is injected into the casing until the center hole (102a) of the drum cover (102) is immersed below the liquid level.
Gas is introduced into the drum cover (100) through the gas conduit.

[0007] The gas introduced in this manner is introduced into one gas metering chamber (105) located above the liquid level by an inlet (105) formed between adjacent inlet blades (101b).
b) penetrates and the gas pressure rotates the drum. By the rotation of the drum, the gas is filled into the room, and the sealing liquid (L) is discharged from the adjacent outlet blade (101).
c) It flows out of the measuring chamber through the outlet (105c) formed by the gap. When the drum further rotates and the outlet (105c) appears on the liquid surface, the outlet (105c)
The gas in the measuring chamber is released from c), and the sealed liquid (L) flows into the chamber from the inlet (105b). 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 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.

[0010]

However, in the above-mentioned conventional wet gas meter drum, the measuring chamber (1
Since the gas passage cross-sectional area of 05) greatly changes between the inlet portion (105b) and the outlet portion (105c), the amount of sample gas absorbed and discharged from the measurement chamber (105) varies depending on the rotation angle. For this reason, the sample gas may flow in and out at once according to the rotation angle, and at that time, there is a problem that the liquid level fluctuates in the drum and the measurement accuracy is reduced.

Further, the partition plate portion (10) of the blade plate (101) is provided.
1a), the inlet blade portion (101b), and the outlet blade portion (101c) have different inclination angles with respect to the liquid surface, and therefore have different infiltration angles into the sealing liquid (L). For this reason, there has been a problem that the fluid resistance greatly changes depending on the rotation angle and rotation unevenness occurs, and this also causes a decrease in measurement accuracy.

In addition, since the conventional drum is formed by assembling a plurality of blades (101) of a complicated shape bent at two places on the drum body (100), the structure becomes complicated. However, there is also a problem that manufacturing is difficult.

The present invention solves the above-mentioned problems of the prior art, has a simplified structure, and can be easily manufactured.
It is another object of the present invention to provide a wet gas meter drum capable of further improving the measurement accuracy.

[0014] To achieve the above object, the present invention includes, in a cylindrical drum body, the vane to Article spiral with constant lead angle from the drum end side toward the drum and the other end side along the axis drum It is arranged so as to make one or more rounds around the axis , separated by its blades, and from one end of the drum.
A single spiral gas measuring chamber is formed to extend to the other end, and when immersed in the sealing liquid up to a predetermined liquid level, the drum rotates and the sample gas is measured from one end of the drum. The gist of the present invention is a wet gas meter drum that is adapted to flow into a room and flow out of the other end of the drum.

In the present invention, it is preferable to adopt a configuration in which the blade plate is arranged in a manner to make two turns around the drum axis.

Further, in the present invention, a gas discharge hole for discharging a sample gas in the gas measuring chamber sealed with a sealing liquid to the other end of the drum is provided on an open surface of the blade plate to the other end of the drum. It is preferable to adopt a configuration formed.

[0017]

According to the wet gas meter drum of the present invention, the spiral gas metering chamber is formed by arranging a single spiral blade inside the drum body and forming a spiral gas metering chamber by the blade. Even at the rotation angle of, the blades penetrate into the sealing liquid at a constant inclination angle, so that a change in fluid resistance can be suppressed. Further, since the gas passage cross-sectional area of the gas measuring chamber is constant from the inlet to the outlet, a proportional relationship is established between the amount of rotation of the drum and the amount of sample gas absorbed and discharged from the measuring chamber. Therefore, the sample gas can be smoothly sucked and discharged, and the occurrence of the liquid level fluctuation can be prevented. In addition, the structure of the present drum is such that the blades are simply arranged in a single spiral form inside the drum body, which is very simple.

In the present invention, when adopting a configuration in which the blade plate is arranged so as to make two rounds around the drum axis,
At any rotation angle, the contact area between the blade plate and the sealing liquid becomes equal, and from this point, the change in the fluid resistance can be suppressed. Further, one lap of the wing plate is opened to one end of the drum, and the other lap is opened to the other end of the drum, so that the wing plate is not partially concealed. Work can be done easily. Moreover, since the blades are not partially concealed, the three-dimensional shape of the blades can be measured accurately, and measurement errors and the like can be grasped in advance without actually operating the blades.

In the present invention, when a gas discharge hole is formed on the open surface of the blade plate toward the other end of the drum, the gas metering chamber is submerged at the inlet and then the outlet is exposed above the liquid level. In the meantime, a gas discharge hole appears on the liquid surface, and gas in the measuring chamber is released from the hole to balance the gas pressure in the measuring chamber with the gas pressure at the other end of the drum. Appears on the liquid surface, and the remaining gas in the measuring chamber is discharged by replacement with the sealing liquid.

[0020]

1A is a side sectional view showing a wet gas meter drum according to an embodiment of the present invention, FIG. 1B is a rear view of the drum, and FIG. 2 is an exploded view of the embodiment drum. FIG. 3 is a development view of a drum barrel in the example drum.

As shown in these figures, this drum
A cylindrical drum body (10), an inner cylinder body (20) arranged coaxially inside the drum body (10), and a single blade plate arranged in an annular space between the two cylinder bodies (10) 30).

The inner cylindrical body (20) is formed to be shorter than the drum body (10), and end face members (21) and (22) are respectively attached to openings at both ends in the axial direction. One end surface member (21) has a drum shaft mounting hole (21
a) is formed, and a through hole (21b) is formed around the mounting hole (21a) to allow the passage of the sealing liquid (L) during operation of the drum. Further, a drum shaft mounting hole (22a) is formed at the center of the other end member (22), and around the mounting hole (22a),
An opening (22) allowing passage of the sealing liquid (L) and the sample gas
b) is formed.

The blade plate (30) is formed in a single spiral form from one end of the drum to the other end along the drum axis in an annular space between the drum body (10) and the inner cylinder (20). It is arranged and fixed to the inner peripheral surface of the drum body (10) and the outer peripheral surface of the inner cylinder (20) in that state. This slat (30)
Are arranged so as to make exactly two turns around the axis of the drum, and one end (31) and the other end (3
2) are set to be arranged at the same rotational position. As a result, one gas measuring chamber (40) is formed, which is surrounded by the drum body (10), the inner cylinder body (20), and the blade plate (30) and spirals around the drum axis. You. The gas metering chamber (40) is provided with a blade (3
0) at one end (31) and the other end (32), that is, at an inlet (41) and an outlet (42).

The open surface of the blade plate (30) toward the other end of the drum communicates with the gas metering chamber (40) at a position shifted by 180 ° from the other end (32) of the blade plate (30). A gas discharge hole (33) is formed. In the present invention, the gas discharge holes (33) do not necessarily need to be formed at the above-mentioned positions, and are formed after one end (31) of the blade (30) enters the sealing liquid (L) during operation of the drum. Wing board (30)
The other end (32) is positioned to emerge on working liquid (L) to until the revealing on sealing liquid (L), in other words the metering chamber (40)
It may be formed at a position where it appears on the sealing liquid (L) between the time when the inlet part (41) is submerged and the time when the outlet part (42) appears on the liquid surface.

On the other hand, a drum cover (11) is mounted on one end side opening of the drum body (10), and a gas conduit insertion hole (11a) is formed in the center of the cover (11). ing.

The drum shaft (50) is provided with a gas conduit insertion hole (11a) in the drum cover (11) and the drum shaft mounting holes (21a) (22) in the end face members (21) and (22).
a), and fixed by fixing members (21c) and (22c) in a state of being arranged along the drum axis.

In the drum having the above-described structure, a drum shaft (50) is rotatably supported in a horizontal posture in a casing (not shown), and a gas passage pipe insertion hole (11a) of the drum cover (11) is inserted into the drum cover (11). A gas conduit not shown is inserted and arranged.

At the time of gas measurement, a sealing liquid (L) such as water or oil having a low vapor pressure is injected into the casing to a predetermined liquid level (reference liquid level), and the measuring chamber (4) is rotated according to the rotation angle.
0) is sealed by the sealing liquid (L).

In this state, when the sample gas is introduced into the drum cover (11) through the gas conduit, the drum rotates by the gas pressure in the direction of the arrow (A) in FIG. 1 (b). The drum rotation principle will be described later.

By the rotation of the drum, the entrance (41)
Appears on the sealing liquid (L), the sample gas in the drum cover (11) is filled into the measuring chamber (40) from the inlet (41), and then the inlet (41) is submerged. The sample gas filled in the measuring chamber (40) is closed by the sealing liquid (L).

When the rotation of the drum advances after the measuring chamber (40) is sealed, the gas discharge holes (3
3) appears on the liquid surface, and the measuring chamber (4)
A small amount of gas in 0) flows out, and the gas pressure in the other end of the drum (in the casing) and the gas pressure in the measuring chamber (40) are balanced.

Subsequently, the outlet (4) of the gas measuring chamber (40)
2) appears on the liquid surface, and the remaining sample gas in the measuring chamber (40) is replaced with the sealing liquid (L), and is discharged to the other end side of the drum (in the casing). Is discharged to the outside through the gas outlet of the upper wall of the casing.

Thereafter, the outlet (4) of the gas measuring chamber (40)
2) is submerged, the inlet (41) appears on the liquid surface, and the above operation is repeated.

As described above, each time the drum makes one rotation, the sample gas is discharged from each of the measuring chambers (40) sealed with the sealing liquid (L). Therefore, the gas flow rate can be measured by integrating the number of rotations of the drum.

Here, the principle of rotation of the drum will be described.

As described above, in the gas meter drum as in this embodiment, when gas flows into the drum cover (11), the rotational force of the drum is obtained by the pressure of the gas. In other words, as shown in FIG. 4, among the gas pressure receiving liquid surfaces in the annular space between the drum body (10) and the inner cylinder (20), the gas pressure receiving liquid surface in the forward rotation direction (A) (the area indicated by oblique lines) ) Is (SA), and the gas pressure receiving liquid surface (the area shown by oblique lines) in the reverse direction (B) is (SB), and the area of the gas receiving pressure liquid surface (SB) and the gas receiving pressure liquid surface ( The rotational moment obtained by multiplying the distance to the center of gravity of SB) is (FA), the area of the gas pressure receiving liquid surface (SA), and the distance from the drum axis (O) to the center of gravity of the gas receiving pressure liquid surface (SA). And the rotational moment obtained by multiplying the rotational moment by (FB), these rotational moments (F
A) The difference between (FB) is the rotational torque of the drum. At this time, in the drum of the present embodiment, the distance from the drum axis (O) to the center of gravity of the gas receiving pressure surface (SA) and the distance from the drum axis (O) to the center of gravity of the gas receiving pressure surface (SB) are as follows. , Are equal, so that the gas receiving pressure level (SA) (S
If there is an area difference between B), a rotational torque is generated on the drum, and it can be said that the greater the area difference, the greater the rotational torque.

Now, in the drum of this embodiment, FIG.
(A) As shown in (b), one end (3
Consider a state immediately after 1) is submerged below the liquid level. In this state, in the drum of the present embodiment, since the blades (30) are arranged in a spiral shape, the gas pressure receiving liquid surface (SB) in the reverse rotation direction (B) is equal to the gas pressure in the normal rotation direction (A). It becomes larger than the pressure receiving liquid surface (SA), and a rotation torque having a magnitude corresponding to the area difference (ΔS) is generated, and the drum tries to rotate in the normal rotation direction (A).

Further, based on this state, FIG.
As shown in (b), when the drum rotates a predetermined amount (less than one rotation) in the normal rotation direction (A), the gas receiving pressure level (SA) in the normal rotation direction (A) increases by a predetermined amount (SA1). Then, the gas receiving pressure level (SB) on the reverse rotation side also increases by a predetermined amount (SB1). Here, since the blade plate (30) is arranged in a spiral shape, a proportional relationship is established between the increase amount (SA1) and the drum rotation amount, and the difference between the increase amount (SB1) and the drum rotation amount. The same constant proportional relationship holds between them. In other words, the increments (SA1) and (SB1) are equal, and the area difference (ΔS) between the gas receiving pressure surfaces (SA) and (SB) is the same.
1) is equal to the area difference (ΔS) in the state of FIG.

Thus, regardless of the amount of rotation of the drum,
In other words, regardless of the rotation angle of the drum, the area difference between the gas pressure receiving liquid surface (SA) in the normal rotation direction (A) and the gas pressure receiving liquid surface (SB) in the reverse rotation direction (B) is kept constant throughout. .

Since the drum returns to the same state every rotation, even if the drum rotates more than one rotation, the area difference between the gas pressure receiving liquid surfaces (SA) and (SB) is always constant. There is no substitute for being kept.

Therefore, at any rotational angle, the area difference between the gas receiving pressure areas (SA) and (SB) is always constant, so that a constant rotational torque is obtained in the normal rotation direction (A) throughout. The drum of this embodiment is rotated by a constant rotational torque throughout the entire operation.

As described above, the drum of this embodiment rotates with a constant rotational torque throughout, so that a stable rotational operation can be obtained, and the measurement accuracy can be improved.

Further, in this embodiment, since the blades (30) are arranged in a spiral shape, at any rotation angle,
The blade plate (30) penetrates into the sealing liquid (L) at a fixed angle of inclination, so that a change in fluid resistance can be suppressed. Moreover, since the blade plate (30) is arranged so as to make two rounds around the axis, at any rotation angle,
The contact area between the blade plate (30) and the sealing liquid (L) becomes equal, and also in this respect, a change in fluid resistance can be suppressed. Therefore, more stable rotation can be obtained, and the measurement accuracy can be further improved.

Further, the gas metering chamber (40) is formed by being partitioned by the spiral blade plate (30).
From the inlet (41) to the outlet (4) of the gas measuring chamber (40).
The gas passage cross-sectional area up to 2) becomes constant, and a proportional relationship is established between the amount of rotation of the drum and the amount of sample gas sucked and discharged from the gas metering chamber (40). Therefore, the sample gas can be smoothly sucked and discharged, and the liquid level fluctuation can be prevented.
Measurement accuracy can be improved.

Further, the drum of this embodiment has a drum cylinder (1).
0) and the inner plate (20) in the annular space.
0) is simply arranged in a spiral shape, so that the structure can be simplified and the production can be easily performed.

Further, by arranging the blade plate (30) in two turns, the first round of the blade plate (30) is opened to one end of the drum, and the remaining one round is rotated to the other end of the drum. Since it is open to the side, the slats (30) are not partially concealed, making the manufacturing operation much easier. Moreover, since the blade (30) is not partially hidden, the three-dimensional shape of the blade (30) can be measured accurately. Therefore, it is possible to accurately grasp the measurement error and the like without actually operating it, and to omit the accuracy measurement test and the like when actually operating it. Can be planned.

In the drum of this embodiment, since the gas discharge hole (33) is formed at the other end of the blade (30), the inlet (41) of the measuring chamber (40) is submerged. After that, before the outlet part (42) appears on the liquid surface, the gas discharge hole (33) appears on the liquid surface and the hole (33)
The sample gas in the measuring chamber (40) is released from the chamber, and the gas pressure in the measuring chamber (40) is balanced with the gas pressure on the other end of the drum. Then, the gas in the measuring chamber (40) is replaced with the sealing liquid (L) and discharged. Therefore, the gas is not discharged at once, but is smoothly performed. In addition, the backflow of the sealing liquid (L) into the drum due to the gas discharge at once can be prevented, and the liquid level fluctuation in the drum can be effectively prevented. Can be prevented,
Measurement accuracy can be improved.

[0048]

As described above, according to the wet gas meter drum of the present invention, the blade plate is disposed inside the drum body in a single spiral shape, and the spiral gas metering chamber is divided by the blade plate. Because it is formed, the blades penetrate into the sealing liquid at a constant inclination angle at any rotation angle, which can suppress the change in fluid resistance and prevent the occurrence of rotation unevenness, etc. As a result, stable rotation can be obtained and measurement accuracy can be improved. Furthermore, since a proportional relationship is established between the amount of rotation of the drum and the amount of sample gas absorbed and discharged from the measuring chamber, the sample gas can be smoothly absorbed and discharged, and the occurrence of liquid level fluctuation can be prevented, and the measurement accuracy can be further improved. Can be improved. In addition, this drum simply has the blades arranged in a single spiral inside the drum body, so that it is possible to simplify the structure and to easily produce the drum.

In the present invention, in the case of employing a configuration in which the blades are arranged so as to make two turns around the axis of the drum,
At any rotation angle, the contact area between the blade plate and the sealing liquid becomes equal, and from this point, the change in the fluid resistance can be suppressed, and the measurement accuracy can be further improved. Further, one lap of the wing plate is opened to one end of the drum, and the other lap is opened to the other end of the drum, so that the wing plate is not partially concealed. Work can be performed even more easily. Moreover, since the blades are not partially concealed, the three-dimensional shape of the blades can be accurately measured, and measurement errors can be grasped in advance without actually operating the blades.
There is an advantage that a highly accurate gas flow measurement can be performed.

In the present invention, in the case where a gas discharge hole is formed on the open surface of the blade plate toward the other end of the drum, the gas metering chamber is submerged at the inlet portion until the outlet portion appears on the liquid surface. In the meantime, a gas discharge hole appears on the liquid surface, and the gas in the measuring chamber is released from the hole to balance the gas pressure in the measuring chamber with the gas pressure at the other end of the drum. The remaining gas in the measuring chamber that appears on the liquid level is discharged.
Therefore, the gas is not discharged at once, and the gas is smoothly discharged.At the same time, the backflow of the sealed liquid into the drum due to the gas discharge is prevented, and from this point, the liquid level fluctuation in the drum is prevented. There is the advantage that the measurement can be effectively prevented and the measurement accuracy can be further improved.

[Brief description of the drawings]

FIG. 1 is a view showing a wet gas meter drum according to an embodiment of the present invention, wherein FIG. 1 (a) is a side sectional view and FIG. 1 (b) is a rear view.

FIG. 2 is an exploded perspective view showing the drum of the embodiment.

FIG. 3 is a development view of a drum barrel in the drum of the embodiment.

FIG. 4 is a view showing a state immediately after the inlet of the drum of the embodiment is immersed in the sealing liquid, and FIG.
FIG. 3B is a horizontal sectional view.

5 is a view showing a state in which the drum of the embodiment is rotated by a predetermined amount from the state of FIG. 4, wherein FIG. 5 (a) is a front view and FIG. 5 (b) is a horizontal sectional view.

FIG. 6 is a perspective view showing a conventional wet gas meter drum with a drum cover separated.

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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Drum cylinder 30 ... Blade plate 31 ... Blade plate one end 32 ... Blade plate other end 33 ... Gas discharge hole 40 ... Gas measuring chamber L ... Sealed liquid O ... Drum axis

Claims (3)

(57) [Claims] 1. A fixed lead is provided inside a cylindrical drum body along an axis from one end of the drum to the other end of the drum.
One or more spirals around the drum axis at a single spiral angle
The drum is separated from its one end by the other end
A single spiral gas measuring chamber is formed over the side, and in a state where the gas measuring chamber is immersed in the sealing liquid to a predetermined liquid level, the sample gas accompanies the rotation of the drum, and the sample gas enters the gas measuring chamber from one end of the drum. A wet gas meter drum that flows in and flows out of the other end of the drum. 2. The wet gas meter drum according to claim 1, wherein said blade plate is arranged so as to make two turns around the drum axis. 3. A gas discharge hole for discharging a sample gas in the gas measuring chamber sealed by a sealing liquid to the other end of the drum is formed on an open surface of the blade plate to the other end of the drum. The drum for a wet gas meter according to claim 1.