JP2777323B2 - Drum for spiral type 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 spiral type wet gas meter drum used for measuring a gas flow rate.

[0002]

2. Description of the Related Art As a drum for a wet gas meter used for measuring a gas flow rate, the drum shown in FIGS. 8 and 9 is most common. This drum (Dz) has a cylindrical drum body (100) and four blades (101). Each blade (101) is provided with a partition plate (10
1a), an inlet blade portion (101b) and an outlet blade portion (101) connected to both sides thereof and bent in mutually opposite directions.
c), with the respective inlet blades (101b) and outlet blades (101c) facing the open ends at both ends of the drum body (100) inside the drum body (100). By displacing the positions in the circumferential direction, the four measuring chambers (10
5) is formed. Further, 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). .

[0003] The drum (Dz) having this structure is rotatably accommodated in a casing (not shown), and a sealing liquid is injected into the casing to a reference liquid level (L). In this state, when a sample gas is sent into the drum cover (102) through a gas conduit (not shown) inserted into the central hole (102a) of the drum cover (102), one gas on the liquid surface is discharged. The drum enters the measuring chamber (105) from between the inlet blades, and the drum rotates by gas pressure. The gas is filled into the room by this rotation,
The sealed liquid is discharged to the outside of the measuring chamber from between the outlet blades so as to be replaced with the gas. Further, when the drum rotates, the gas in the measuring chamber is discharged from the other end side of the drum so as to be replaced with the sealing liquid, and is discharged out of the casing through a discharge port formed in the casing.

Such an operation is sequentially performed on the measuring chambers (105) appearing on the liquid surface, so that the gas is discharged while being divided into the measuring chambers (105) sequentially.
Accumulated flow rate of the gas from the rotary speed of the drum in seeing the gas feed write is to be measured.

Incidentally, this type of wet gas meter drum (Dz) is provided with a partition plate (1) of a blade (101).
01a) is arranged to cross the direction of rotation,
The resistance of the partition plate portion (101a) with the sealing liquid is large, and there is a defect that rotation unevenness occurs and measurement accuracy is reduced.

<Background of the Invention> Therefore, the present inventor
In order to solve the above-mentioned drawbacks, there has been proposed a spiral type wet gas meter drum in which blades are spirally arranged.

This drum (Ds) is shown in FIGS.
As shown in FIG. 1, an outer cylinder (111), an inner cylinder (112) arranged in the interior thereof with their axes aligned, and both cylinders (11).
1) Four blades (113) arranged in the annular space of (112) to extend spirally from one end side of the drum to the other end side, and each of the spiral plates is arranged between adjacent blade plates. Four gas measuring chambers (114) are formed.

[0008] In the drum (Ds), the test body gas is introduced into the interior of the drum cover (115), will be filled the gas from entering into the gas measuring chamber above the liquid surface (114), The sealed liquid flows out from the other end of the drum so as to be replaced with the gas. As the rotation further proceeds, the gas in the chamber flows out from the other end of the drum, and the sealed liquid flows into the measuring chamber so as to be replaced with the gas.

Such an operation is sequentially performed on the measuring chambers appearing on the liquid surface, and the integrated flow rate of the gas is measured in the same manner as described above.

In this drum (Ds), the blades (11
3) is spirally arranged, so that the blades (11)
3) is disposed substantially along the direction of rotation of the drum, and the resistance of the sealing liquid (L) is extremely small even when the blade plate (113) is in the liquid during the rotation of the drum, and the drum rotates smoothly to measure accuracy. Is improved.

[0011]

However, as shown in FIG. 10, when the measuring chamber (114) of the spiral type drum (Ds) is located above the liquid level, the inner circumference of the outer cylinder (111) is not provided. Surface, the outer peripheral surface of the inner cylinder (112),
Since all four directions are surrounded by the adjacent blades (113), when the rotation speed is high, the weighing chamber (11
When 4) appears on the liquid surface, the fluid resistance of the sealing liquid with respect to the wall surface of the measuring chamber increases, and the sealing liquid moves upward with the rotation of the drum and the liquid level rises to the reference liquid level (L). ), The gas volume in the metering chamber (114) changes slightly,
There is a problem that the measurement accuracy may be reduced.

The present invention has been made on the basis of the above-described viewpoint, and can prevent a liquid level fluctuation in a measuring chamber due to a fluid resistance at the time of high-speed rotation of a drum, and can improve measurement accuracy. An object of the present invention is to provide a gas meter drum.

[0013]

In order to achieve the above object, a spiral type wet gas meter drum according to the present invention comprises a cylindrical drum body, and a fixed inside thereof extending from one end to the other end along an axis. A plurality of blades that are spirally extended at a lead angle of and are provided at positions shifted from each other in the circumferential direction, and an outer peripheral edge of each blade is respectively joined to an inner peripheral surface of the drum body. inner peripheral edge of the blade plate is arranged so as to be lower than the reference fluid level, respectively, one end
The gist is that a plurality of spiral gas measuring chambers whose inner peripheral sides are substantially open are formed between adjacent blades at a constant interval from the edge to the other edge. is there.

Further, in the present invention, it is desirable to limit the number of the blades to two.

If the inner peripheral side of the gas metering chamber is configured to be substantially opened, an inner cylinder may be provided inside the drum body.

Further, in the present invention, when the inner cylinder is disposed so as to be lower than the reference liquid level, it is preferable to form a through hole in the peripheral wall of the inner cylinder.

[0017]

According to the spiral wet gas meter drum of the present invention, since the blades are spirally arranged, the drum is
Regardless of the rotational position of the
It becomes constant, and the resistance change due to liquid sealing during drum rotation is extremely high
Therefore, a stable rotation operation can be obtained. Furthermore, since the inner peripheral side of the gas measuring chamber is open, when the measuring chamber appears on the liquid surface with the rotation of the drum, the sealed liquid is moved to the inner peripheral opening side. By flowing, the fluid resistance of the sealed liquid with respect to the wall surface of the measuring chamber is reduced, and the rise of the liquid level is prevented.

Further, in the present invention, when the number of blades to be installed is specified as two, it is possible to secure a large dimension between the blades, for example, as compared with a case having three or more blades. Also, the fluid resistance of the sealing liquid with the blade can be reduced from this point as well.

Further, in the present invention, when the inner cylinder is arranged inside the drum body, the outer peripheral edge of the blade plate is joined and fixed to the inner peripheral surface of the drum body at the time of assembling the drum. By fixing the side to the inner cylindrical body, both the outer peripheral edge and the inner peripheral side of the blade plate can be positioned, and the blade plate is supported at two points, the drum body and the inner cylindrical body. The mounting shape of the blade can be kept good.

In the present invention, when the inner cylinder is disposed so as to be lower than the reference liquid level, if a through hole is formed in the peripheral wall of the inner cylinder, the liquid sealed in the measuring chamber can penetrate. Since the fluid flows into the inner cylinder through the hole, the rise in the liquid level due to the fluid resistance can be more reliably prevented.

[0021]

FIG. 1A is a side sectional view showing a spiral wet gas meter drum (D1) according to a first embodiment of the present invention.
FIG. 2B is a front view showing the drum with its cover removed, and FIG. 2 is an exploded perspective view.

As shown in these figures, this drum (D
1) has a cylindrical drum cylinder (1) and four blades (2) arranged inside the drum cylinder (1).

Each of the blades (2) is formed in a substantially C-shape in plan view as shown in FIG. 3, and as shown in FIG. 1 and FIG. In the state shifted from the position (2) by 90 degrees in the circumferential direction, they are spirally arranged with a constant lead angle from one end to the other end along the axis. At this time, the adjacent slats (2)
In a state where the distance between the blades (2) is kept constant toward the edge, the outer peripheral edge (2a) of each blade (2) is joined to the inner peripheral surface of the drum body (1), and each inner peripheral edge (2b) is The liquid level is lower than the reference liquid level (L), that is, the inner peripheral edge (2
b) is arranged so that it is always lower than the liquid level when the drum (D1) is immersed in the sealing liquid to the reference liquid level (L). As a result, the inside of the drum body (1) is partitioned at equal intervals by the blade plate (2), the outer peripheral side is closed by the inner peripheral surface of the drum body (1), and the spiral inner side is opened. Four gas metering chambers (4) are formed. Each measuring chamber (4) is opened between the blades at one end and the other end of the drum, that is, by an inlet (4a) and an outlet (4b).

On the other hand, a drum cover (3) having a central hole (3a) is mounted on one end side opening of the drum body (1). Further, washers (5) and (6) are attached to both ends of each blade (2), and a drum shaft (7) is provided.
Are attached to the washers (5) and (6) while being inserted through the center hole (3a) of the drum cover (3) and arranged along the axis of the drum.

The drum (D1) having such a configuration is supported in a casing of a wet gas meter via a drum shaft (7), and is immersed in a sealing liquid up to a reference liquid level (L). At this time, the measuring chambers (4) communicate with each other at the center, but the reference liquid level (L) is higher than the highest level of the communicating chambers. Is sealed by a sealing liquid with respect to the measuring chamber (4).

In this state, when a sample gas is introduced into the drum cover (3) through a gas conducting pipe (not shown) inserted through the central hole (3a) of the drum cover (3), the gas becomes liquid level. The gas enters the upper gas metering chamber (4) from the inlet (4a), and the gas pressure causes the drum (D1) to rotate in the direction indicated by the arrow in FIG. 1 (b).

With the rotation of the drum, the gas is supplied to the measuring chamber (4).
And the sealed liquid is discharged from the outlet (4b) at the other end of the drum so as to be replaced with the gas. As the rotation of the drum further proceeds, the measuring chamber (4) submerges from the inlet (4a), and once the inside is sealed, an outlet (4b) at the other end of the drum appears on the liquid surface. Further, as the measuring chamber (4) is submerged,
The outlet (4) so that the gas in the measuring chamber is replaced with the sealed liquid.
The gas is discharged into the casing through b) and the gas is discharged out of the casing through the gas outlet of the upper wall of the casing.

On the other hand, with the rotation of the drum, the same operation as described above is sequentially performed on the gas metering chambers (4) which sequentially appear on the liquid surface.

As described above, the gas is discharged while being divided into the respective measuring chambers (4), and the gas for the four measuring chambers is discharged by one rotation of the drum (D1). Therefore, the gas flow rate can be measured by integrating the number of rotations of the drum (D1).

According to the gas meter drum (D1), since the inner peripheral side of the gas metering chamber (4) is open,
When the measuring chamber (4) appears on the liquid surface with the rotation of the drum, the sealing liquid in the chamber flows toward the inner peripheral opening, thereby reducing the fluid resistance of the sealing liquid with the wall surface of the measuring chamber. As a result, a rise in the liquid level is prevented, and a change in the capacity of the measuring chamber (4) during the high-speed rotation of the drum, that is, a so-called right-down phenomenon of the instrumental error can be prevented, thereby improving the measurement accuracy.

In comparison with the spiral gas meter drum (Ds) shown in FIGS. 10 and 11, the drum (D1) of this embodiment has a larger measuring chamber capacity because no inner cylinder is formed. . Therefore, the size of the drum (D1) can be reduced while securing a large measuring chamber capacity. Further, since the inner cylinder is not attached, the number of constituent members can be reduced correspondingly, and the cost can be reduced.

The gas meter drum (D1)
Is a spiral type in which the blades (2) are spirally arranged, so that effects unique to the spiral drum, such as good stability during rotation of the drum, can be obtained.

<Second Embodiment> FIGS. 4 and 5 show a spiral wet gas meter drum (D2) according to a second embodiment of the present invention. As shown in these figures, in the drum (D2), the first drum is placed inside a cylindrical drum body (11).
In the same manner as in the embodiment, four blade plates (12) are spirally arranged, and four gas measuring chambers (14) are formed between adjacent blade plates, respectively, and the drum cylinder (11) is formed.
An inner cylindrical body (18) is provided with the axes aligned inside. At this time, the inner cylinder (18) is arranged so as to be partially higher than the reference liquid level (L), and the inner peripheral edge (12b) of each blade (12) is Are arranged so as to penetrate the peripheral wall portion of the lower portion and become lower than the reference liquid level (L).

In the peripheral wall portion of the inner cylindrical body (18), a through hole () communicating between the inner cylindrical body and each of the measuring chambers (14) is provided between the blades (12). 18a) are formed. Further, a shaft mounting hole (15) for mounting the drum shaft (17) at the center position of the closing member (18b) (18c) for closing both end surfaces of the inner cylindrical body (18).
(16) is formed, and the holes (15) (1) are formed.
In the outer peripheral portion of 6), a sealing liquid passage hole (18d) that allows passage of sealing liquid corresponding to a position lower than the reference liquid level (L).
(18e) is formed.

The drum shaft (17) is connected to the drum body (1).
1) is inserted through the central hole (13a) of the drum cover (13) attached to one end of the drum cover (13) and the shaft mounting holes (15) and (16), and is arranged on the axis, and Is fixed to the shaft mounting hole (16).

This drum (D2) is used in the gas meter casing in a state immersed in the sealing liquid up to the reference liquid level (L) in the same manner as described above. At this time, a part of the inner cylinder (18) is projected above the liquid surface, but since the through-hole (18a) is formed in the peripheral wall of the inner cylinder (18), the gas metering chamber is formed. The inner peripheral side of (14) is substantially opened. Therefore, as in the first embodiment, when the measuring chamber (14) appears on the liquid surface, the sealed liquid in the chamber flows through the through-hole (18a) to the inner peripheral opening side. By doing so, the fluid resistance between the sealed liquid and the wall surface of the measuring chamber is reduced, and the rise of the liquid level is prevented. Accordingly, a change in the capacity of the measuring chamber (14) during high-speed rotation of the drum can be prevented, and the measurement accuracy can be improved.

Further, the drum (D) of the second embodiment
In 2), the inner cylinder (18) is provided in the drum body (11).
Are arranged on the peripheral wall of the inner cylinder body (18).
Because 2) is installed, when assembling the drum,
The outer peripheral edge (12a) of the blade plate (12) is
And the inner peripheral side of the blade plate is bonded and fixed to the inner cylinder body (18), thereby forming the blade plate (12).
Can be positioned on both the outer peripheral edge (12a) and the inner peripheral side, and the assembling operation can be performed easily. Moreover, the blade plate (18) is composed of the drum body (11) and the inner cylinder (1).
8), the mounting shape of the blade (18) can be kept good, and high measurement accuracy can be maintained over a long period of time. That is, when the blades (18) are formed of a resin such as vinyl chloride, the mounting shape may change over time due to the restoring force of the blades. In this way, each blade (18) is connected at two points. With the support, the secular change can be prevented, the change in the capacity of the measuring chamber due to the shape change can be prevented, and high measurement accuracy can be maintained for a long period of time.

However, in the case where the blade plate (18) is formed of metal, if the internal stress is removed in advance,
The slats (18) do not age.

<Third Embodiment> FIG. 6 is a view showing a spiral type wet gas meter drum (D3) according to a third embodiment of the present invention. The drum (D3) is provided coaxially inside the cylindrical drum body (21) so that the inner cylinder body (28) is lower than the reference liquid level (L) as a whole. In the annular space between (21) and the inner cylinder (28), 2
The blades (22) are spirally arranged with their positions shifted from each other by 180 degrees in the circumferential direction. At this time, each blade (2
The outer peripheral edge (22a) of (2) is joined to the inner peripheral surface of the drum body (21), and each inner peripheral edge (22b) is connected to the inner cylindrical body (2).
8) is joined to the outer peripheral surface. Thereby, two gas measuring chambers (24) are formed between the blade plates.

Other configurations are the same as the configurations of the drums (D1) and (D2) in each of the above embodiments. Therefore, the same portions are denoted by the same reference numerals and description thereof is omitted.

This drum (D3) is used with the sealing liquid immersed to the reference liquid level (L). At this time, since the entire area of the inner cylinder is disposed below the liquid level, the gas metering chamber (2
The inner peripheral side of 4) is substantially open, so that the liquid level can be prevented from rising at the time of high-speed rotation of the drum, and the measurement accuracy can be improved, as in the above embodiments.

Further, the outer peripheral edge (22) of the blade (22)
a) on the inner peripheral surface of the drum cylinder (21), the inner peripheral edge (22b).
Can be bonded and fixed to the outer peripheral surface of the inner cylinder body (28), respectively, so that the drum assembling operation can be easily performed as in the second embodiment, and the aging of the blade plate (28) can be prevented from occurring over a long period of time. High measurement accuracy can be maintained throughout.

Further, since the number of blades (22) to be installed is specified as two, the distance between the blades, that is, the width of the measuring chamber, that is, the width of the weighing chamber is smaller than that of, for example, one having three or more blades. A large space can be secured, the wall surface of the sealed liquid measuring chamber and the fluid resistance can be reduced, and also in this respect, the measurement accuracy can be improved.

<Fourth Embodiment> FIG. 7 is a sectional view showing a spiral wet gas meter drum (D4) according to a fourth embodiment of the present invention. As shown in the figure, the drum (D4) has an inner cylindrical body (2).
8), a through hole (28) communicating between the inside of the inner cylinder and each of the measuring chambers (24) corresponding to between the blade plates (22).
a) is formed.

The other structure is the same as that of the drum (D3) of the third embodiment.

In the drum (D4), the same effect as that of the drum (D3) is obtained.
Since the through-hole (28a) is formed in 8), the sealing liquid in the measuring chamber (24) flows into the inner cylinder through the through-hole (28a), so that the sealing liquid flows into the inner peripheral opening. The fluid flows smoothly to the side, the rise of the liquid level due to the fluid resistance can be more reliably prevented, and the measurement accuracy can be further improved.

In each of the above embodiments, the material of each component of the drum is not particularly limited, and it can be formed of a transparent hard synthetic resin such as vinyl chloride, or a metal. Furthermore, as for these joining methods, not only an adhesive but also a method of joining by, for example, soldering or welding can be used according to the material of each constituent member.

[0048]

As described above, according to the spiral type wet gas meter drum of the present invention, the blade plate has a spiral shape.
Because it is located, regardless of the rotation position of the drum,
The resistance of the impeller to sealing liquid becomes constant, and the drum rotates.
The change in resistance due to liquid sealing is extremely small,
Rotation operation, improving measurement accuracy.
You. Furthermore, since the inner peripheral side of the gas measuring chamber is open, when the measuring chamber appears on the liquid surface with the rotation of the drum, the sealed liquid in the chamber flows to the inner peripheral opening part side, The fluid resistance of the sealed liquid with the wall surface of the measuring chamber is reduced, so that the liquid level is prevented from rising, and the gas volume in the measuring chamber is prevented from changing during the high-speed rotation of the drum, so that the effect of further improving the measurement accuracy is obtained. .

Further, when the number of blades to be installed is specified as two, the size between the blades can be ensured to be larger than that having three or more blades, for example. There is an advantage that the fluid resistance with the blade plate can be reduced, and in this regard, the measurement accuracy can be improved.

When the inner cylinder is disposed inside the drum body, the outer peripheral edge of the blade plate is joined and fixed to the inner peripheral surface of the drum body when assembling the drum. By fixing to the body, both the outer peripheral edge and the inner peripheral side of the blade plate can be positioned, and the assembling work can be easily performed. Further, since the blade plate is supported at two points, the drum body and the inner cylinder, there is an advantage that the mounting shape of the blade plate can be kept good, and high measurement accuracy can be maintained for a long period of time.

In the case where the inner cylinder is arranged so as to be lower than the reference liquid level, if a through hole is formed in the peripheral wall of the inner cylinder, the liquid sealed in the measuring chamber passes through the through hole. Since the liquid flows into the inner cylindrical body, the sealing liquid flows smoothly to the inner peripheral opening portion side, and the rise of the liquid level due to the fluid resistance can be more reliably prevented, and the measurement accuracy can be further improved. There is an advantage.

[Brief description of the drawings]

FIG. 1 is a diagram showing a wet gas meter drum according to a first embodiment of the present invention.

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

FIG. 3 is a plan view showing a blade used in the drum of the first embodiment.

FIG. 4 is a view showing a wet gas meter drum according to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a drum according to a second embodiment.

FIG. 6 is a view showing a wet gas meter drum according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing a wet gas meter drum according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view showing a conventional wet gas meter drum.

FIG. 9 is an exploded perspective view showing a part of a conventional drum.

FIG. 10 is a cross-sectional view showing a drum for a wet gas meter of a proposal example.

FIG. 11 is an exploded perspective view showing a drum of a proposal example.

[Explanation of symbols]

 Reference numerals 1, 11, 21: drum cylinders 2, 12, 22: blades 2a, 12a, 22a: outer peripheral edges 2b, 12b, 22b: inner peripheral edges 4, 14, 24: gas measuring chambers 18, 28: inner cylindrical body 18a, 28a: through hole D1 to D4: drum L: reference liquid level

Claims (5)

(57) [Claims] 1. A cylindrical drum body, which extends spirally at a fixed lead angle from one end side to the other end side along an axis inside the cylindrical drum body and is displaced in the circumferential direction from each other. Provided with a plurality of provided vanes, the outer peripheral edge of each vane is respectively joined to the inner peripheral surface of the drum cylinder, and arranged such that the inner peripheral edge of each vane is lower than the reference liquid level. From one edge to the other edge
Between adjacent slats with a constant spacing between them
A spiral-type wet gas meter drum, wherein a plurality of spiral gas measuring chambers whose inner peripheral sides are substantially open are formed. 2. The spiral wet gas meter drum according to claim 1, wherein the number of the blades is limited to two. 3. Coaxially inside the drum cylinder,
The inner cylinder is provided so as to be partially higher than the reference liquid level, the blade is penetrated through the peripheral wall of the inner cylinder, and the inside of the inner cylinder and the measuring chamber are formed in the peripheral wall of the inner cylinder. 3. A through-hole communicating with the inside is formed.
4. A drum for a spiral-type wet gas meter according to item 1. 4. Coaxially inside the drum cylinder,
The spiral wet gas meter according to claim 1 or 2, wherein the inner cylinder is provided so as to be lower than the reference liquid level as a whole, and the inner peripheral edge of the blade is joined to the outer peripheral surface of the inner cylinder. For drums. 5. The spiral-type wet gas meter drum according to claim 4, wherein a through hole communicating between the inside of the inner cylinder and the inside of the measuring chamber is formed in a peripheral wall portion of the inner cylinder.