JP2565630B2 - Wet gas meter drum - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet gas meter drum.

[0002]

2. Description of the Related Art A conventional wet gas meter drum is shown in FIG.
As shown in FIG. 8, a cylindrical drum body (100) is attached to the inner surface of the drum body (100) and the inside of the drum body is divided into a plurality of measuring chambers (usually 4 chambers). It has a plurality of blades (101 in the figure).

As shown in FIG. 7, each blade (101) has a rectangular partition plate portion (101a) having an arcuate concave portion at one end, and an inlet blade portion (101b) connected to both sides of the partition plate portion. ) And an outlet blade portion (101c), and both blade portions (101b) (101
c) is approximately 45 at the joint (101d) with the partition plate (101a).
It is bent in opposite directions at an angle of degrees. The inlet blade portion (101b) and the outlet blade portion (101c) are attached to the inner peripheral edges of both ends of the drum body, and the partition plate portion (101a) crosses the inner peripheral surface of the drum body (100) obliquely in the axial direction. In an aspect,
The outer peripheral edge of each blade is fixed to the inner peripheral surface of the drum body by soldering, bonding, or the like. And each blade (101) is
The drum body (100) is arranged at four equal positions in the circumferential direction, and the inlet blade portion (101b) and the outlet blade portion (101c) of adjacent blades are circumferentially overlapped with each other.

6 and 8, reference numeral (102) is a drum cover for accumulating inflow gas in the drum body (100), and (102a) is provided at the center of the drum cover (102). The gas inlet tube insertion hole (103) is located at the center of both sides of the drum body in the axial direction, and the inlet blade (10) of each blade (101)
1b) and a washer joined to the outlet blade (101c), (104
) Is a shaft that is attached through both washers.

The wet gas meter drum shown in FIGS. 6 to 8 is used by immersing the drum in water so that the shaft (104) sinks below the water surface. Then, a pipe (not shown) is inserted into the gas introduction pipe insertion hole (102a), and gas is introduced into the drum through the pipe. The introduced gas is trapped in one gas measuring chamber (105) on the water surface. The pressure of the gas flowing into the gas measuring chamber (105) is applied to the partition plate portion (101a) of the blade (101) that partitions the measuring chamber, and the drum rotates. As the rotation advances, the discharge side opening of the gas measuring chamber (105) faces upward, so the gas in the measuring chamber is discharged to the other side in the axial direction of the drum and the measuring chamber (105) is submerged in water. And will be replaced by water. On the other hand, the gas introduced from the gas introduction pipe is filled in the next measuring chamber (105) that appears on the water surface, and the same operation is performed thereafter.

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

[0007]

However, the conventional wet type gas meter drum as described above has a gas measuring chamber (10
The blade (101) that defines 5) is the entrance / exit blade (101b)
The part (101c) is bent to about 45 degrees at the part (101d) connected to the partition plate part (101a), and the partition plate part (10
Since 1a) is provided so as to traverse the inner peripheral surface of the drum body (100) in the axial direction, there are the following drawbacks.

That is, when the gas measuring chamber (105) is below the surface of the water, the partition plate (101a) receives a large resistance to water as it rotates, and when the partition plate (101a) is underwater. Otherwise, the rolling resistance will be different. In particular,
When the partition plate part (101a) plunges into and out of the water, the resistance of the water changes drastically, causing not only a slow speed of rotation but also a rapid change in the flow of water, which causes a sudden change in the flow of water. Also, there is a drawback in that the water surface in the vicinity and the water surface change drastically, which lowers the measurement accuracy. Such a decrease in measurement accuracy has been a serious concern for a wet gas meter which is often used as a standard device for calibration comparison or a standard device.

In addition, especially when the gas pressure is increased to rotate the drum at a high speed, the pressure loss increases, and the instrumental error fluctuates in the minus direction with the accumulation of the measured rotation speed, which is a so-called downward tendency. There was also a drawback.

In addition, the bending process of the blade (100) is troublesome and strict bending accuracy is required, so that there is a drawback that it takes skill and time to manufacture the blade, and further to manufacture the drum itself. . In addition, since the blades were formed by sheet metal bending, etc., each part was flat except for the bent parts. Therefore, when assembling the drum body and the blades,
In particular, there is a drawback in that the blades are likely to be distorted during soldering, resulting in variations in the volume of the measuring chamber, which leads to a decrease in the instrumental error accuracy.

The present invention has been made in view of the above technical background, and it is possible to improve the measurement accuracy by reducing the fluctuation of the rotation and the fluctuation of the water surface when the blades appear and disappear from the water. An object of the present invention is to provide a drum for a wet gas meter, which has little variation in instrumental error due to variation in rotation of the drum, has a simple structure, and is easy to manufacture.

[0012]

In order to achieve the above-mentioned object, a drum for a wet gas meter according to the present invention is provided on an inner peripheral surface of a cylindrical drum body (1) on one end side in the axial direction of the drum body. a plurality of blades extending helically over the other end at a constant lead angle (31) - (34), by which is provided by shifting the position in the circumferential direction, the drum cylinder (1) in one
From the edge (31a) to (34a) to the other edge (31b) to (34b)
It is characterized in that a plurality of spiral gas measuring chambers (51) to (54) partitioned by adjacent blades whose mutual intervals are kept constant are formed.

Further, preferably, an inner cylinder (2) is coaxially arranged in the drum body (1), and a blade () is provided between an outer peripheral surface of the inner cylinder (2) and an inner peripheral surface of the drum body (1). 31) to (34) are preferably provided, and gas measuring chambers (51) to (54) are preferably formed.

In this case, the inner cylinder (2) is closed at its end face or inside by the closing members (21) and (22), and one or a plurality of the closing members (21) and (22) are provided at the same or lower position as the penetrating water level. It is desirable that the through hole (24) is formed.

[0015]

[Function] Since the blades (31) to (34) are provided in a spiral shape, the resistance of water due to the rotation in water is small, and therefore the rotation resistance when the blade is in the water and on the surface of the water is small. The difference is small and the drum (A) rotates smoothly. Moreover, when the blade plunges into or out of the water, it plunges into or out of the water at an acute angle, so there is little change in the resistance of the water.

Further, when the inner cylinder (2) is present, the area of the interface between the water surface and the measuring chamber is reduced by the amount corresponding to the protrusion on the water surface of the inner cylinder (2). Compared with the case where (2) does not exist, the influence of the water surface on the measuring chamber is suppressed. Moreover, by filling the inner cylinder (2) with gas during gas measurement, it is possible to apply an inlet pressure to the inner cylinder to generate buoyancy, reducing the load applied to the drum bearing portion, and Wear is reduced and stable operation is maintained over a long period of time.

Further, both end blocking members (21) of the inner cylinder (2)
By providing the through hole (24) in the (22), water that has moved from the inlet side to the outlet side of the drum (A) below the water surface along the measuring chamber is passed through the through hole (24) to the drum. (A)
It can be smoothly returned to the entry side of, and does not cause heavy water surface movement or water flow.

[0018]

Embodiments of the present invention will now be described with reference to FIGS.

In FIGS. 1 and 2, (A) is a drum, which comprises a drum cylinder (1) having a short cylindrical shape, an inner cylinder (2) provided coaxially in the drum cylinder, and a drum. It has four blades (31) to (34) arranged in an annular space between the inner peripheral surface of the body (1) and the outer peripheral surface of the inner cylinder (2).

A drum cover (4) is fitted on the opening surface at one end of the drum body (1). The drum cover (4) stores the inflowing gas, and has a gas introduction pipe insertion hole (41) at its center.

The inner cylinder (2) is slightly shorter than the drum body (1), and both sides in the axial direction are closed members (21) (22).
Is closed. Of these closing members, one closing member (21) is integrally formed with the inner cylinder (2), and the other closing member (22) is a disc-shaped lid fitted around the opening of the inner cylinder. Become. In addition, a shaft hole (23) is formed in the center of both the closing members (21) and (22), and a penetrating water level (a gas level that gas passes through and is not measured around the shaft hole (23). ), A through hole (24) is formed to allow water to pass therethrough, and one closing member (22) is further formed.
In the outer periphery of the through hole (24), a large diameter inflow hole (25) for allowing gas to flow into and fill the inner cylinder (2) is formed. The through hole (24) may be provided at the same position as the through water level.

The blades (31) to (34) are provided upright between the inner peripheral surface of the drum body (1) and the outer peripheral surface of the inner cylinder (2), and the drum body (1). or from one side of the other side
With a constant lead angle, it spirally extends smoothly without any folds . Angles from one end edge (31a) to (34a) (shown in FIG. 4) of each blade (31) to (34) viewed from the axial direction of the drum body (1) to the other end edge (31b) to (34b) Is set in relation to the penetrating water level, etc., and is about 25 in this embodiment.
It is set to about 0 degrees. Then, the four blades (31) to (34) are arranged so as to be displaced by 90 degrees in the circumferential direction, so that one edge is formed in the space between the drum barrel (1) and the inner cylinder (2). (31a) to (34a) to the other edge (31b
) ~ (34b) Adjacent with a constant mutual spacing
Four helical gas measuring chamber partitioned by the vanes (5
1) to (54) are formed. Specifically, FIG.
As shown in (c), for example, the gas measuring chamber (51) is opened between the tip edges (31a) (32a) of the two blades (31) (32) on one end side (entrance side) of the drum. On the other end side (outlet side) of the drum, openings are formed between the rear end edges (31b) (32b) of the blades (31) (32).

In this embodiment, the drum body (1), the inner cylinder (2), the closing members (21) and (22), and the blades (31) to (3).
4) and the drum cover (4) are both made of resin such as vinyl chloride. And the inner cylinder (2) and the blade (31)
~ (34) is manufactured by machining using a lathe, the inner cylinder with blades (2) is set in the drum body (1), and the outer peripheral edges of the blades (31) to (34) are bonded. It is joined to the inner peripheral surface of the drum body (1) by an agent, and further, the drum cover (4) and the closing members (21, 22) are joined at predetermined positions by an adhesive agent.

The drum cylinder (1), the inner cylinder (2) and other parts may be made of metal instead of resin. Further, the joining method is not limited to using an adhesive, but may be joining using, for example, soldering or welding depending on the material of each member.

FIG. 3 shows a cross-sectional view of a wet gas meter in which the drum (A) is arranged. In the figure, (6) is a gas meter main body, and a partition wall (61) that hangs down to an intermediate position is provided at one end of an upper wall (64) of the gas meter main body (6). The inside of is divided into two chambers, left and right. And
The left compartment is the gas inflow chamber (62) and the right compartment is the drum chamber (63).
(63) communicates with each other through an opening below the partition wall.

The gas inflow chamber (62) is formed with a gas inflow hole (65) which opens to the upper wall (64) of the gas meter body (6) and opens above the gas inflow chamber (62). The gas introduction pipe (66) is vertically installed. on the other hand,
In the drum chamber (63), the drum (A) shown in FIGS. 1 and 2 is provided on the left and right walls (67) (67) of the gas meter body (6).
It is arranged in a state in which it is rotatably attached to a shaft (68) that is spanned over. In addition, (68 ') (68') shown in FIG. 3 is a bearing part which supports the shaft (68). And the drum (A)
The drum cover (4) is axially mounted so that the drum cover (4) is located on the gas inflow chamber (62) side, and the upward projecting branch pipe (66a) branched from the gas introduction pipe (66) is an introduction pipe of the drum cover. It is inserted upward from the insertion hole (41).
Also, a gas outlet hole (69) is provided at the upper wall end of the drum chamber (63).
Has been drilled.

Water (7) is injected into the gas meter body (6) to the extent that the drum shaft (68) is submerged, and the drum (A) is immersed in water except for the upper part. ing. The water level is set to be higher than the penetration water level, higher than the lower end of the partition wall (61), and lower than the upper ends of the gas introduction pipe (66) and the branch pipe (66a).

In this state, the gas is pressure-fed from the outside to the gas inflow chamber (62) of the gas meter body (6). With this gas pressure, as shown in FIG. 3, the water level in the gas inflow chamber (62) is lowered and the water level in the drum chamber (63) is raised. Further, the gas flowing into the gas inflow chamber (62) enters the introduction pipe (66) and then the branch pipe (66a), and then the drum front chamber between the drum cover (4) and the inner cylinder (2) of the drum. (63 ') and further into the inner cylinder (2) through the inflow hole (25) of the closing member (22) to lower the water level in the drum and lower the water level in the drum front chamber (63'). That is, the gas metering replacement water level is kept constant, and the water level is maintained so as to reduce the instrumental error variation with respect to the gas pressure change, that is, the gas flow rate change.

On the other hand, the gas flowing into the drum front chamber (63 ') is also the measuring chamber (51) (shown in FIG. 4) on the water surface among the four gas measuring chambers (51) to (54). Of the blade (31) that partitions the measuring chamber (51) while filling the measuring chamber (51) from the opening (formed by the leading edges (31a) (32a) of the blades (31) (32)). The inner surface is pressed by the gas pressure, and the drum (A) rotates in the clockwise direction shown by the arrow in FIG. With the rotation of the drum, the rear part of the measuring chamber (51) into which the gas has flown gradually appears on the water surface, and at the same time, the gas is filled. As the drum (A) further rotates, as shown in FIG. 5, the opening on the inlet side of the gas measuring chamber (51) sinks into the water and the outlet side of the drum of the measuring chamber (51). The opening edge (31b) of this appears on the water surface, the gas in the measuring chamber (51) is discharged from the rear end opening to the drum chamber (63), and then discharged from the gas outflow hole (69) to the outside of the gas meter. To be done.

On the other hand, as the inlet side opening of the gas measuring chamber (51) moves in the rotating direction, the opening edges (32a) and (33a)
The next-stage gas measuring chamber (52) opening between the two gradually appears on the water surface, and the measuring chamber (52) is also filled with gas.

In this way, the drum (A) rotates one after another, but since the blades (31) to (34) are provided in a spiral shape, the resistance of water due to the rotation in water is small, and therefore the blades are submerged in water. The difference in the rotational resistance between when the drum is on the water surface and when it is on the water surface is small, and the drum (A) rotates smoothly. Moreover,
When the blade plunges into or out of the water, it plunges into or out of the water at an acute angle, so there is little change in the resistance of the water, so the rotating drum maintains smooth rotation with little slowness and The change in water surface will be small.

On the other hand, below the surface of the water, the water moves along the measuring chamber submerged in the water in the same manner as the movement of the gas in the drum (A).
Although it moves from the inlet side to the outlet side of the inner cylinder (2), since both end closing members (21) and (22) of the inner cylinder (2) are provided with through holes (24), through the through holes (24). Water smoothly returns to the entrance side of the drum (A), and despite the double drum structure of the drum body (1) and the inner cylinder (2), no violent water surface movement or water flow occurs. . Moreover, since the inner cylinder (2) is present, the area of the interface between the water surface and the measuring chamber is reduced by the amount corresponding to the protrusion on the water surface of the inner cylinder (2). ) Is not present, the influence of the measuring surface from the water surface is suppressed.

In this way, simultaneously with the rotation of the drum (A), the amount of gas corresponding to the volumes of the respective measuring chambers (51) to (54) is sequentially divided while the drum (A) is rotated from the other surface side. It is discharged into the chamber (63). Therefore, one rotation of the drum (A) discharges gas for four measuring chambers, and the rotation speed of the drum is detected and integrated by a rotation speed detection device (not shown) to measure the gas flow rate.

Although the number of blades is four in the above embodiments, it may be three or less or five or more.

[0035]

As described above, according to the present invention, since the blade is formed in a spiral shape, the resistance of water due to the rotation is extremely small even when the blade is below the water surface, and therefore the blade on the water surface is very small. There is almost no difference in the rotational resistance received by the blades in the water, the rotational fluctuation can be suppressed, and the drum can be smoothly rotated. In addition, when the water rushes into and out of the water, it rushes in and out smoothly, so the resistance change of the water is extremely small, and it is possible to prevent the slow rotation of the drum caused by this, making the drum smoother and smoother. Can be rotated. Further, even when the gas pressure is increased and the drum is rotated at a high speed, the pressure loss is reduced regardless of the presence or absence of the inner cylinder, and the instrumental error does not show a so-called downward-sloping tendency as the measured rotation speed is accumulated. Further, since the load fluctuation applied to the drum bearing is reduced, the wear of the drum bearing is reduced, the number of maintenances can be reduced, and the life of the gas meter can be extended.

Moreover, since there is little change in the resistance of the water when the blades plunge into the water or project from the water, the fluctuation of the water surface is reduced, and the deterioration of the measurement accuracy due to the fluctuation of the water surface can be prevented. Highly accurate flow rate measurement is possible in combination with the fact that there are few.

Since the influence of the water surface fluctuation is small,
Even if the whole is made smaller, the measurement accuracy does not decrease, and therefore it is possible to manufacture a wet gas meter with high accuracy and small capacity.

Furthermore, since the spiral blade is not required to be bent and formed as in the conventional case, it is relatively easy, and thus the manufacture of the entire drum can be simplified, and the entire blade is spiral. Since it is twisted, it can be made strong even if it is thin, can maintain a stable shape for a long period of time, and can be a durable and long-life drum capable of high-precision measurement for a long time.

Further, in addition to the above effects, the drum according to claim 2 can reduce the area of the interface between the measuring chamber and the water surface by the area occupied by the inner cylinder on the water surface. Since it has a double-drum structure, it has a large rotational moment, which has the effect of further improving the small capacity and accuracy. For example, in the past, only a minimum drum of 0.5 liters / revolution could be realized, whereas
According to the drum of the second aspect, a small capacity drum of 0.2 to 0.25 litztor / revolution can be realized. In addition, if necessary, gas can flow into the inner cylinder to generate buoyancy in the inner cylinder and reduce the load on the drum bearing.

Further, in addition to the above effects, in the invention according to claim 3, the water sent from the inlet side to the outlet side of the drum by the measuring chamber in the water is provided in the closing member on both end surfaces of the inner cylinder. Because you can return to the entrance side of the drum through the through hole,
It is possible to prevent the occurrence of a violent water flow and water surface fluctuation, and there is an effect that a wet gas meter with less measurement error and higher accuracy can be formed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a drum according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the drum shown in FIG.

FIG. 3 is a vertical sectional view of a gas meter using the drum of FIGS. 1 and 2.

FIG. 4 is a diagram for explaining an operating state, in which (a) is FIG.
Is a front sectional view of a drum in the gas meter of FIG. 3, (B) is a rear view thereof, and (C) is a plan view thereof.

5 is a front view of the drum of FIG. 4 rotated about 120 degrees.

FIG. 6 is a perspective view showing a conventional drum with a part of its drum body separated.

FIG. 7 is a perspective view of blades of the drum of FIG.

8 is a vertical cross-sectional view of the drum of FIG.

[Explanation of symbols]

 A ... Drum 1 ... Drum body 2 ... Inner cylinder 31-34 ... Blade 24 ... Through hole 51-54 ... Gas measuring chamber

Claims (3)

(57) [Claims] To 1. A inner peripheral surface of a cylindrical drum body (1), certain re over from one end to the other end in the axial direction of the drum body
A plurality of blades (31) to (34) that spirally extend at an angle
However, by being displaced in the circumferential direction, one end edge (31a) to (34a) to the other end in the drum body (1).
Keep a constant mutual distance from the edges (31b) to (34b)
A wet gas meter drum comprising a plurality of spiral gas measuring chambers (51) to (54) partitioned by adjacent blades. 2. An inner cylinder (2) is coaxially arranged in the drum body (1), and blades (31) are provided between the outer peripheral surface of the inner cylinder (2) and the inner peripheral surface of the drum body (1). ~ (34) is provided and the gas metering chambers (51)-(54) are formed, The drum for wet gas meters of Claim 1 characterized by the above-mentioned. 3. The inner cylinder (2) is closed at its end face or inside by closing members (21) (22), and at the closing member, at a position equivalent to the penetrating water level or at a lower position.
The two or more through holes (24) are formed.
A drum for a wet gas meter according to item 1.