JP3472632B2 - Drum for wet gas meter - Google Patents

Description

Description: 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. 2. Description of the Related Art As shown in FIGS. 6 and 7, a conventional wet gas meter drum 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 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 body (100), and positions the adjacent inlet blades (101b) and outlet blades (101c) in the circumferential direction in a state of being overlapped on the outer peripheral portion. By being displaced, four measuring chambers (105) partitioned by the blades (101) are formed inside the drum body. 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 enters one gas metering chamber (105) located above the liquid level through an inlet (105b) formed between the blades at one end of the drum, and rotates the drum by gas pressure. . By the rotation of the drum, gas is charged into the chamber and replaced with the gas, so that the sealing liquid (L) flows through the outlet (105c) formed between the blades at the other end of the drum. It flows out of the weighing chamber. When the drum further rotates and the outlet (105c) appears on the liquid surface, the outlet (1
The gas in the measuring chamber is released from 05c), and the sealed liquid (L) flows into the chamber from the inlet (105b) so as to replace the gas. And the exit (105
The gas released from c) 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. As shown in an exploded view of the drum cylinder (100) in FIG. 8, the conventional wet gas meter drum is bent at the inlet blade (101b) in the axial direction of the drum. The bending angle (α) of the outlet blade portion (101c) with respect to the drum axis direction is smaller than the angle (α1).
Since 2) is formed larger, the inlet blade (1
01b) and the distance between the outlet blades (101c) in the drum axis direction change along the drum peripheral direction,
For example, any three positions (L
The distances (d1) to (d3) in the drum axis direction between the inlet blade (101b) and the outlet blade (101c) in (1) to (L3) are different from each other.
The cross-sectional area of the gas passage between (01b) and (101c) (measured cross-sectional area) differs at each of the positions (L1) to (L3). For this reason, the rotation speed of the drum at the time of gas measurement becomes unstable, and the inflow and outflow of the sealing liquid (L) cannot be performed smoothly, causing uneven rotation and liquid level fluctuation. In particular, the position (L) where the inlet blades (101b) overlap each other.
2) and the position (L3) where the blade portions (101b) or (101c) do not overlap with each other, there is a considerable difference in the measured cross-sectional area, so that the position (L2) is shifted from the position (L2) to the position (L3).
In this case, there is a problem that the amount of sample gas absorbed and exhausted changes drastically, causing significant rotation unevenness and liquid level fluctuation, thereby lowering measurement accuracy. Furthermore, when the measuring cross-sectional area changes along the direction of the circumference of the drum, the amount of sample gas absorbed and discharged differs depending on the rotational position of the drum. , An accurate proportional relationship was not established, and the gas flow rate could not be accurately measured within one revolution. For this reason, in a gas meter to which a conventional drum is applied, it is necessary to measure a gas flow rate based on a gas metering volume of one drum, and a trace gas cannot be accurately measured within one revolution, and in real time, Since it cannot be measured, it is unsuitable as an instantaneous flow meter, and is currently used exclusively as an integrating flow meter. The present invention provides a drum for a wet gas meter which solves the above-mentioned problems of the prior art, can maintain a high measurement accuracy, and can be suitably used not only as an integrated flow meter but also as an instantaneous flow meter. The purpose is to: In order to achieve the above object, a drum for a wet gas meter according to the present invention has a cylindrical drum body and an inlet blade and an outlet blade on both sides of a partition plate. A plurality of blade plates provided so as to be bent in opposite directions, and each blade plate has its inlet blade portion and outlet blade portion facing the open ends at both ends of the drum drum inside the drum drum. In this state, the sample gas is arranged so as to be shifted in the circumferential direction, and the sample gas flows between the adjacent inlet blades and between the inlet blades and the outlet blades with the rotation of the drum, In a wet gas meter drum that is discharged from between adjacent outlet blades, a gas passage between the inlet blade and the outlet blade is provided by disposing the inlet blade and the outlet blade in parallel with each other. The gist is that the cross-sectional area is set to be constant over the entire circumference of the drum. In the drum for a wet gas meter according to the present invention, the cross-sectional area of the gas passage between the inlet blade and the outlet blade is set to be constant over the entire circumference of the drum. The speed is stable, the sealing liquid and the sample gas enter and exit the drum smoothly, and uneven rotation and liquid level fluctuation can be effectively prevented. Further, since the measuring cross-sectional area is constant over the entire circumference of the drum, the amount of sample gas absorbed and discharged is the same regardless of the rotational position of the drum. An accurate proportional relationship is established between the amount of sample gas and the amount of sample gas absorbed and discharged, and a trace gas can be accurately measured in real time based on the amount of rotation of the drum within one rotation. 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. ) Is a front view of the same drum with its drum cover removed,
FIG. 3B is a rear view. As shown in these figures,
This wet gas meter drum comprises a cylindrical drum body (1) made of a transparent hard synthetic resin such as vinyl chloride, and four blades disposed inside thereof and also made of a transparent hard synthetic resin such as vinyl chloride. (2). As shown in FIG. 4A, each blade (2)
Is formed in a substantially fan shape, and is bent in opposite directions along a two-dot chain line in FIG.
As shown in (b), an inlet blade part (22) and an outlet blade part (23) are continuously formed at both ends of the central partition plate part (21). In this case, the inlet blade (22)
Of the outlet blade (23) and the bending angle (α4) of the outlet blade (23) with respect to the partition plate (21) are equal to each other.
3) is bent. Note that the bending angle (α3) (α
4) is larger than the conventional one, ie, from 150 degrees
Preferably, it is set to about 160 degrees. Then, four blades (2) of this shape
Has the inlet blade (22) and the outlet blade (23) facing the open ends of the drum body (1), and the outlet blade (22) and the outlet blade (23) are aligned with the axis of the drum. Are arranged at right angles to each other, and are shifted from each other by 90 degrees in the circumferential direction in a state where the adjacent inlet blades (22) and the outlet blades (23) are not overlapped with each other. ) Is divided by the blades (2) to form four measuring chambers (3) along the circumferential direction. At this time, as shown in a development view of the drum body (1) in FIG. 5, the inlet blade portion (22) and the outlet blade portion (23) are arranged in parallel with each other over the entire circumference of the drum, and both blade portions ( The distance (d) in the drum axis direction between (22) and (23) is kept constant over the entire circumference of the drum. For this reason, the gas passage cross-sectional area (measurement cross-sectional area) between the two blade portions (22) and (23) is kept constant over the entire circumference of the drum. When immersed in the sealing liquid (L) to a predetermined position, both blades (22) (2)
The volume on the sealed liquid (gas metering volume) during 3) is kept constant regardless of the drum rotation position. As shown in FIG. 3, the adjacent inlet blades (22) and the outlet blades (23) are separated from each other in the circumferential direction without overlapping in the drum axis direction. An inlet part (32) and an outlet part (33) communicating with the chamber (3) are formed. The distance between the outer peripheral ends of the adjacent outlet blades (23) is set to be larger than the distance between the outer peripheral ends of the inlet blades (22). The area is formed larger than that of the inlet portion (32). On the other hand, an open end (opening side) on one end side of the drum body (1) is made of a transparent hard synthetic resin such as vinyl chloride and has a gas passage pipe insertion hole (41) formed in the center. The drum cover (4) is attached. The drum constructed as described above is a hard synthetic resin drum attached to the blade plate (2) with the drum shaft (5) arranged along the axis of the drum body (1). It is fixed by a washer (6). The drum shaft (5) is rotatably accommodated in a casing while being held in a horizontal position, and the gas cover pipe insertion hole (41) of the drum cover (4).
A gas conduit tube (not shown) is inserted and arranged in the second position. further,
At the time of gas measurement, the sealing liquid (L) such as water or oil having a low water vapor pressure in the casing reaches a predetermined liquid level, that is, a liquid level at which the sample gas does not penetrate through the inside of the drum at a level higher than the gas conduit insertion hole (41). When the gas is injected, each measuring chamber (3) is sealed on the liquid level with the other measuring chambers (3) by the gas measured by the sealing liquid (L). In this state, when a sample gas is introduced into the drum cover (4) through the gas conduit, the gas is
The gas enters the one measuring chamber (3) located above the liquid level from the inlet (32), and the drum is rotated by gas pressure. With the rotation of the drum, the gas is charged into the chamber, and the sealed liquid (L) flows out from the outlet (33) so as to replace the gas. Further, as the rotation of the drum proceeds, the measuring chamber (3) submerges from the inlet (32) side, and after the inside is once sealed, the outlet (33).
Appears on the liquid surface. Further, as the measuring chamber (3) is submerged, the gas in the chamber is discharged into the casing through the outlet (33) so as to be replaced with the sealing liquid (L), and then discharged to the outside of the casing. Is done. 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 divided into the respective measuring chambers (3) 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. According to this gas meter, the measurement cross-sectional area is kept constant over the entire circumference of the drum, so that the rotation speed of the drum is stabilized at the time of gas measurement, and the sealed liquid (L) and the sample gas enter and exit the drum. The measurement is performed smoothly, and the rotation accuracy and the liquid level change do not occur, and the measurement accuracy can be maintained at a high level. Also, since the measuring cross-sectional area is constant over the entire circumference of the drum, the amount of sample gas absorbed and discharged is the same regardless of the rotational position of the drum. An accurate proportional relationship is established between and the amount of sample gas absorbed and discharged. Therefore, the trace gas can be accurately measured in real time based on the rotation amount within one rotation of the drum, and can be suitably used as an instantaneous flow meter. In the drum of this embodiment, at the inlet (32) and the outlet (33) of the measuring chamber (3), the inlet blades (22) and the outlet blades (2) are connected.
3) Since they are not overlapped with each other, the fluid resistance of the sealing liquid (L) entering and exiting the measuring chamber (3) can be reduced. In this respect, uneven rotation of the drum and fluctuation of the liquid level can be prevented.
Measurement accuracy can be improved. Further, the distance between the outer peripheral ends of the outlet blades (23) is set to be larger than that of the inlet blade (22).
Measurement accuracy can be improved. That is, in a general wet gas meter drum, the sealing liquid flows in from the inner peripheral side of the inlet portion and flows out from the outer peripheral side of the outlet portion. At this time, if the separation dimension on the outer peripheral end side between the outlet blades is reduced, the sealing liquid will pass through the narrow gap, the fluid resistance will increase, and the sealing liquid will not flow out smoothly, It may cause unevenness and level fluctuation. Therefore, as described above, by forming a large separation dimension on the outer peripheral end side between the outlet blades (23), the sealing liquid (L) passes through the wide space, and the fluid resistance decreases. The sealing liquid (L) flows out smoothly,
Rotational unevenness and liquid level fluctuation can be prevented, and the measurement accuracy can be further improved. In the present invention, as shown in FIG. 5, the angles (α1) and (α2) of the inlet blade portion (22) and the outlet blade portion (23) with respect to the drum axis direction are set to be equal to each other. The measuring cross-sectional area can be set to be constant over the entire circumference of the drum, but as in the above-described embodiment, the angles (α1) and (α2) of the inlet blade portion (22) and the outlet blade portion (23) with respect to the drum axis direction are set. ) Is set at a right angle, and the measuring cross-sectional area is most preferably set to be constant over the entire circumference of the drum. As described above, according to the wet gas meter drum of the present invention, the cross-sectional area of the gas passage between the inlet blade and the outlet blade is set to be constant over the entire circumference of the drum. Therefore, the drum rotation speed during gas measurement is stable,
The sealing liquid and the sample gas enter and exit the drum smoothly, and can effectively prevent uneven rotation and liquid level fluctuation.
Measurement accuracy can be maintained at a high level. Further, since the measuring cross-sectional area is constant over the entire circumference of the drum, the amount of sample gas absorbed and discharged is the same regardless of the rotational position of the drum. An accurate proportional relationship is established with the intake and exhaust amounts of the above. Therefore, the trace gas can be accurately measured in real time based on the rotation amount within one rotation of the drum, and the effect that the instantaneous flow meter can be suitably used as well as the integrated flow meter 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 view showing a drum according to the embodiment, and FIG.
Is a front view, and FIG. 2B is a rear view. 4A and 4B are diagrams showing a blade plate of the drum of the embodiment, wherein FIG. 4A is a plan view and FIG. 4B is a side view. FIG. 5 is a development view of a drum body of the drum according to the embodiment. 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. [Description of Signs] 1 ... drum cylinder 2 ... blade plate 21 ... partition plate portion 22 ... inlet blade portion 23 ... outlet blade portion

Claims (1)

(57) [Claim 1] A cylindrical drum body and a plurality of inlet blades and outlet blades provided on both sides of a partition plate so as to be bent in mutually opposite directions. A blade plate, wherein the respective blade plates are arranged in the circumferential direction of the drum body so as to be displaced in the circumferential direction with the respective inlet blade portions and outlet blade portions facing the open ends of the drum body at both ends. A wet gas in which the sample gas flows between the adjacent inlet blades and between the inlet blades and the outlet blades with the rotation of the drum, and is discharged from between the adjacent outlet blades. In the gas meter drum, the inlet blade portion and the outlet blade portion are arranged in parallel with each other, so that the gas passage cross-sectional area between the inlet blade portion and the outlet blade portion is set to be constant over the entire circumference of the drum. Wet gas Drum for smeter.