JPH0755528A - Wet type gas meter - Google Patents

Abstract

PURPOSE:To provide a wet type gas meter which can set a reference liquid level in an overflow system in an extremely short time and can immediately starts measurement after the reference liquid level is set. CONSTITUTION:A vertical overflow pipe 3 for setting a reference liquid level L and an overflow chamber which is separated from a measuring drum dipping section la by a partition wall 4a are provided in a sealed measuring tank 1 in which the drum 2 is housed in a state where the drum 2 is dipped in a liquid and the chamber 4 is communicated with a liquid discharging passage 6 reaching a lower liquid discharging port 5 at the bottom of the tank 1 and, at the same time, is opened toward the space of the section la above the reference liquid level L.

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 for measuring the flow rate of various gases by utilizing the rotation of a measuring drum immersed in a liquid due to the inflow and outflow of gas.

[0002]

2. Description of the Related Art This type of gas meter is used in a closed measuring tank.
A cylindrical measuring drum, whose interior is divided into multiple measuring chambers arranged in the circumferential direction, is rotatably held in a state of being immersed in a sealing liquid such as water to a position slightly higher than the horizontal drum shaft. Since the measuring chambers are sealed on the liquid surface with respect to other measuring chambers, the sample gas introduced into the measuring tank must be sequentially discharged into each measuring chamber as the drum rotates. It is configured to utilize and measure the integrated flow rate value of gas from the rotation speed of this drum.

As a means for setting the reference liquid level in the measuring tank of such a wet gas meter, a glass tube communicating with the space inside the tank is attached outside the tank casing, and the liquid level is adjusted to the marked line of the glass tube. Gauge glass method, a small box with a glass window is provided instead of the above glass tube, and a gauge box method that adjusts the liquid level to the marked line, a pin is set up in a small box with a glass window instead of the marked line. There is a meniscus method in which the liquid surface is adjusted to the conical tip of the above, and an overflow method in which the liquid level is determined at the upper end position of the opening of the pipe by discharging excess sealing liquid from the overflow pipe arranged in the tank.

[0004]

However, in any of the gauge glass method, gauge box method, and meniscus method described above, since the liquid level measuring section is provided outside the tank casing, the measuring section is It becomes far from the center of the drum, and is easily affected by the inclination of the meter installation posture during measurement, and the measurement accuracy decreases due to the change in the liquid level. Further, when the liquid level measuring unit is provided outside the tank casing, there is a drawback that the measuring unit is easily damaged during handling and the appearance becomes unsightly. In addition, the gauge glass method causes a difference between the liquid level in the glass tube and the actual liquid level in the tank due to capillary phenomenon and surface tension, which causes a measurement error and droplets adhere to the upper ventilation tube section. There is also a problem in that the reliability may be inferior due to the occurrence of clogging. Further, in the gauge box method, the influence of the capillary phenomenon and surface tension is small because the liquid surface of the measuring part is wide, but it requires skill to adjust the liquid surface to the reference line, and there is a drawback that individual differences easily occur. . Furthermore, in the meniscus method, the liquid surface can be adjusted so that the reflected image of the pin reflected on the liquid surface from below can be seen so that the reflected image and the tip of the actual object match, so operation is simple and relatively high setting accuracy can be obtained. However, there was a drawback that it was structurally expensive.

On the other hand, in the overflow system, the sealing liquid is injected from the liquid injection port provided in the casing, and it is confirmed that the liquid sealing liquid flowing into the overflow pipe flows out from the liquid discharge port communicating with the pipe to inject the liquid. Since the reference liquid level is naturally determined by stopping and stopping the outflow from this drain port by screwing a plug into the drain port and closing the plug,
Unlike other methods, there is no need to adjust to the reference position while observing the liquid surface with the naked eye, and there is an advantage that there is no risk of damage like an external liquid surface measuring unit and the appearance is excellent.

However, in the conventional overflow method, even if the liquid injection is stopped after confirming the liquid outflow from the drain port, it may take 2-3 minutes until the outflow from the drain port is completely stopped. However, there is a problem that it hinders quick measurement, and there is also a drawback that it is necessary to reset the liquid level when carrying the gas meter after setting the reference liquid level. In addition, since the overflow pipe is made of metal such as brass, corrosion and oxidation occur at the cut surface of the liquid surface with long-term use, the wettability with the sealing liquid changes, and the liquid level changes over time. Was caused. For this reason,
In recent years, the overflow method is not generally adopted, but the meniscus method is mostly adopted.

In order to eliminate the need for the above resetting, a structure in which a special lid is attached to the tip opening of the overflow pipe and sealed after the initial liquid level setting (Actual No. Sho 63-21)
No. 819 gazette) is also proposed, but in this case, the structure becomes complicated, the cost is high, and the lid attaching operation requires labor.

In view of the above situation, the present invention provides a wet gas meter for setting a reference liquid level by an overflow method, which can set the liquid level in a very short time and can immediately start the measurement. With one purpose,
A second object is to provide a device which does not require resetting of the liquid level even if it is carried after setting the reference liquid level.

[0009]

In order to achieve the first object, a wet gas meter according to claim 1 of the present invention is a closed measuring tank (1) for accommodating a measuring drum (2) in a liquid-immersed state. Inside, a vertical tubular overflow pipe (3) for setting a reference liquid level (L) and a measuring drum dipping portion (1a)
Is provided with an overflow chamber (4) partitioned by a partition wall (4a), and the overflow chamber (4) is provided.
Is connected to the drainage passage (6) from the overflow pipe (3) to the lower drainage port (5) at the bottom, and is opened to the space above the reference liquid level (L) in the measuring drum immersion part (1a). It adopts the following configuration.

In order to achieve the second object, the wet gas meter according to a second aspect of the present invention is the wet gas meter according to the first aspect, wherein the overflow chamber (4) has a reference liquid level (L) higher than the reference level (L). This is a structure in which an upper drainage port (7) that opens slightly lower is provided.

Further, the wet gas meter according to claim 3 of the present invention is the wet gas meter according to claim 1 or 2, wherein the overflow pipe (3) has an opening upper end (3
It adopts a configuration in which the height of a) is variably attached.

The wet gas meter according to claims 4 to 6 of the present invention is a bearing tool for pivotally supporting the overflow pipe (3) and the drum shaft (22) in the measuring tank (1) as the wet gas meter. The gas conduit pipes (21) for introducing or introducing the gas into the inside of the measuring drums (2) and (30) and (40) are made of hard synthetic resin.

[0013]

When the reference liquid level (L) is set, as in the conventional overflow system, the sealed measuring tank (1) is filled with water (or oil) having a lower vapor pressure than the liquid injection port (9) in the upper part (9). 1
0) is injected, but if the sealing liquid (10) flowing into the overflow pipe (3) flows out from the lower drainage port (5),
The injection may be stopped, and the plug (13a) may be immediately screwed into the lower drain port (5) to close the plug without waiting for the outflow. As a result, the excess sealing liquid (10) further flowing into the overflow pipe (3) collects in the lower part of the overflow pipe (3) and the overflow chamber (4), and the liquid surface of the dipping portion (1a) of the measuring drum overflows. It becomes the same level as the upper end (3a) of the opening of (3), and the reference liquid level (L) is naturally determined.

Thus, the upper drainage port (7) which opens in the overflow chamber (4) slightly lower than the reference liquid level (L).
With the configuration provided with, it is possible to set the reference liquid level (L) by a method other than the method described above. That is, in this method, with the lower drainage port (5) closed and the upper drainage port (7) open, the sealing liquid (10) is injected into the closed measuring tank (1), and the overflow pipe (3) is injected. ), The sealing liquid (10) is accumulated in the overflow pipe (3) and the overflow chamber (4), and the upper drain (7)
The injection is stopped when it starts to flow out further, and after the outflow from the upper drainage port (7) has progressed to some extent, the drainage port (7)
The plug (13b) is screwed on and closed. This allows
Similar to the above method, the metering drum immersion part (1a) side is set to the reference liquid level (L) at the same level as the upper end (3a) of the opening of the overflow pipe (3).

In this case, the sealing liquid (10) is accumulated in the overflow pipe (3) and the overflow chamber (4), but the liquid level is only slightly lower than the reference liquid level (L). Moreover, since the area of the liquid surface of the overflow pipe (3) and the overflow chamber (4) is very small with respect to the area of the dipping portion (1a) of the measuring drum, when the gas meter is carried after setting the liquid level, the shaking and inclination Even if the sealing liquid (10) flows into the overflow pipe (3) from the measuring drum dipping portion (1a), the amount of liquid that can flow is extremely small and can be almost ignored with respect to the total amount of liquid. Since it is a degree, the reference liquid level (L) is not substantially changed.

If the overflow pipe (3) is attached to the mounting portion (8) by screwing the lower portion and the height of the upper end (3a) of the opening can be varied by the screwing degree, the pressure and type of the sample gas can be changed. , The structure of the measuring drum (2), the type of injection liquid,
The reference liquid level (L) can be adjusted according to other measurement conditions,
The metering volume (equipment difference) of gas can be adjusted.

When the overflow pipe (3), the bearings (30) (40) and the gas conducting pipe (21) are made of hard synthetic resin, these members are made of, for example, conventional brass. In comparison, the corrosion resistance is excellent, the molding process is easy, the cost can be reduced, and the weight can be reduced.

[0018]

1 to 3 show a wet gas meter according to an embodiment of the present invention. The closed measuring tank (1) of this gas meter includes a lower case (11) which is a tank body made of an aluminum alloy or a stainless alloy and is formed by the lost wax method, and a hard synthetic resin molded product which is a lid of the lower case (11). Alloy upper case (1
2) and peripheral edges (11a) (12a) facing each other.
A gasket (14) is interposed between them, and they are joined and screwed (15), and the measuring drum (2) is provided inside thereof.
Are stored in a sealed liquid (10).

The measuring drum (2) is made of hard synthetic resin or metal, and has a plurality of end cylinders divided into a drum copper (2a) and a plurality of measuring chambers (2c) arranged in the circumferential direction. And a donut-shaped drum cover (2d) attached to one end side of the drum body (2a), that is, the gas outlet side.

As shown in FIGS. 1 and 3, at the rear side of the lower case (11), that is, at the corner of the metering drum (2) on the gas lead-out side, a partition wall (4a) is used to immerse the metering drum (1a). ) Separated overflow chamber (4)
And an L-shaped tubular mounting portion (8) projecting from the lower portion of the partition wall (4a) toward the center of the tank.

A connecting cylinder (16) made of a hard synthetic resin such as hard vinyl chloride is connected to the mounting portion (8) by screwing a lower end portion (16a) having a small outer diameter into the connecting cylinder (16). 1
6), an overflow pipe (3) made of a hard synthetic resin such as hard vinyl chloride is attached in an upright shape by externally fitting and screwing the lower portion.

The overflow pipe (3) is twisted by engaging the tip of a pipe twisting jig with the groove (3c) of the inward flange portion (3b) provided on the inner circumference of the upper portion,
The screwing depth with respect to the connecting cylinder (16) can be changed. Therefore, this overflow pipe (3)
The reference liquid level (L) determined by the opening upper end (3a) of
It is possible to adjust within a range of several mm with the state shown in the figure as an upper limit.

The fitting portion between the mounting portion (8) and the connecting pipe (16) and the fitting portion between the connecting pipe (16) and the overflow pipe (3) are respectively O-rings (17a).
It is liquid-tightly sealed via (17b).

A lower drainage port (5) is provided below the overflow chamber (4), and a drainage passage (6) from this lower drainage port (5) to the inside of the mounting portion (8) is connected. Tube (1
The inside of 6) communicates with the inside of the overflow pipe (3) and also communicates with the bottom of the overflow chamber (4). Further, the partition wall (4a) is set such that the upper end thereof is higher than the upper end (3a) of the opening of the overflow pipe (3) at the upper limit position, and the overflow chamber (4)
Is open at the upper side and communicates with the upper space of the dipping portion (1a) of the measuring drum. Further, an upper drainage port (7) that penetrates to the outside is provided at the upper part of the overflow chamber (4), and the upper end (3a) of the opening of the overflow pipe (3) at the lower limit position is the upper drainage port (7). It is set to be slightly higher than the lowest part of the opening edge. On the lower side at the outer open end of the upper drainage port (7), a dripping prevention protrusion (7a) is integrally formed so as to project downward, and the protrusion (7a) allows the drainage port (7a). ), Even when the amount of drainage discharged from the case is small, the drainage is made to be good, thereby preventing the drainage from being transmitted to the outer surface of the lower case (11), and It is configured to prevent dirt.

The lower drainage port (5) and the upper drainage port (7) can be closed by screwing plugs (13a) and (13b) respectively.

As shown in FIGS. 1 and 2, the upper wall (12b) of the upper case (12) is provided with a liquid inlet (9), a gas inlet (18) and a gas outlet (19). The injection port (9) can be closed by screwing the plug (9a). Further, the gas inlet port (18) and the gas outlet port (19) have a single-cylinder-shaped connecting pipe (18a).
The gas introducing adapter (18b) and the gas extracting adapter (19b) are rotatably connected via (19a). In addition, a jig insertion hole (not shown) is formed in the upper wall portion (12b) at a position corresponding to the upper side of the overflow pipe (3), and the upper case (1
Even when 2) is attached to the lower case (11), the pipe height can be increased by inserting the pipe twisting jig into the jig insertion hole and twisting the overflow pipe (3). You can adjust the.

On the other hand, as shown in FIG. 2, the lower case (1
A drum shaft insertion hole (31) is formed in the front wall of 1), that is, the wall located on the gas introduction side of the measuring drum (2), and the front bearing member (30) is screwed into the hole (31). (3
It is attached by 2). Further, a bearing mounting recess (41) is formed in the inner surface of the rear wall of the lower case (11), and the rear bearing member (40) is capped in the recess (41). In addition, the bearings (30) (4
0) is composed of bearing bushes (30a) (40a) made of hard synthetic resin such as hard vinyl chloride, and a rubber oil seal (not shown) for sealing the sealing liquid, etc. .

One end of the drum shaft (22) fixed to the measuring drum (2) along its axis is rotatably supported by the rear bearing member (30), and the other end is front bearing. It is rotatably supported by the tool (40).

On the other hand, the gas discharge pipe (21) for discharging the gas in the drum is made of a hard synthetic resin such as hard vinyl chloride, and is composed of the main pipe portion (21a) and the main pipe portion (21a). And a branched pipe portion (21b). On the other hand, a pipe mounting portion (50) for mounting the lower end of the main pipe portion (21a) is formed in the lower rear wall of the lower case (11), and the pipe mounting portion (50) has the main pipe portion (21a). Of the main pipe portion (21a) is crowned to the gas outlet (19) via an O-ring (52).

The branch pipe portion (21) of the gas conduit pipe (21)
b) is inserted into the central hole (2e) of the drum cover (2d) and is disposed inside the one end side of the drum.
The tip of 1b) is opened at a position higher than the liquid level inside the one end side of the drum.

A counter casing (60) is integrally formed with the lower case (11) in front of the measuring tank (1), and a counter device (not shown) is housed inside the counter casing (60) and a drum ( The rotation status of 2) is transmitted to the counter device via the drum shaft (22), and the device measures the integrated flow rate of the gas and displays the measured value.

In the wet gas meter having the above structure,
The following two methods can be adopted as the means for setting the reference liquid level (L). First, in the first method, with the lower drainage port (5) opened and the upper drainage port (7) closed, a sealing liquid made of water or oil having a lower vapor pressure than the injection port (9) ( 1
0) was injected, and when the sealing liquid (10) that had flowed into the overflow pipe (3) flowed out from the lower drainage port (5),
Stop the injection and plug (1) into the lower drain (5).
3a) is screwed on and closed. As a result, the excess sealing liquid (1) that still flows into the overflow pipe (3) after the plug is closed.
0) accumulates in the lower portion of the overflow pipe (3) and the overflow chamber (4), and when the inflow is stopped, the liquid level of the dipping portion (1a) of the measuring drum is set at the upper end (3a) of the opening of the overflow pipe (3). )) (Strictly speaking, the liquid level is slightly higher due to the surface tension), and the reference liquid level (L) is naturally determined.

Therefore, in the first method, unlike the conventional overflow method, it is not necessary to wait until the outflow from the drain is completely stopped, and the gas measurement can be started immediately after the outflow is confirmed. On the other hand, in the conventional overflow type gas meter, if the drainage port is closed immediately after confirming the outflow from the drainage port, the excess sealing liquid fills the overflow pipe, and the liquid level is the upper end of the overflow pipe. Since it exceeds the height, the reference liquid level (L) cannot be set. Even when the liquid level is set by the first method, there is no possibility that the sealing liquid (10) will flow into the overflow pipe (3) during the gas measurement to lower the liquid level. That is, in the closed measuring tank (1) during gas measurement, the liquid level on the antechamber side where the overflow pipe (3) is arranged is constantly lowered due to the pressure of the introduced gas, and the flow into the overflow pipe (3) is prevented. Because it does not happen.
Therefore, in this gas meter, it is not necessary to seal the upper end of the opening of the overflow pipe (3) after setting the liquid level,
There is no need for complicated mechanisms and structures for providing the lid for sealing and complicated operations.

In the second method, contrary to the first method, the lower drainage port (5) is closed and the upper drainage port (7) is opened, and the liquid is injected from the liquid injection port (9) ( Inject 10). Then, the sealing liquid (1
0) is accumulated in the overflow pipe (3) and the overflow chamber (4) and starts to flow out from the upper drainage port (7), the injection is stopped, and the outflow from the upper drainage port (7) progresses to some extent. After that, a plug (13
Screw in b) and close. As a result, the measuring drum dipping section (1a) side is set to the reference liquid level (L) at the same level as the upper end (3a) of the opening of the overflow pipe (3) as in the first method.

According to this second method, the overflow pipe (3) and the overflow chamber (4) are filled with a liquid (1).
0) is accumulated, but its liquid level is only slightly lower than the reference liquid level (L), and the areas of the liquid levels of the overflow pipe (3) and the overflow chamber (4) are immersed in the measuring drum. Since the area is very small compared to the area of the part (1a), when the gas meter is carried after setting the liquid level, the sealing liquid (10) flows into the overflow pipe (3) from the dipping part (1a) of the measuring drum due to shaking or inclination. However, since the amount of liquid that can flow in is extremely small and can be almost ignored with respect to the total amount of liquid, the reference liquid level (L) does not substantially fluctuate. Therefore, when the gas measurement is repeatedly performed by changing the place, it is not necessary to reset the reference liquid level (L) every time the gas is moved, and the gas can be used for the next gas measurement in the state where it is initially set. , Very efficient.

Thus, by pouring a sealing liquid such as water or oil having a low water vapor pressure into the measuring tank (1) up to a predetermined reference liquid level (L), each measuring chamber (2c) of the measuring drum (2).
Is set so that the gas measured by the liquid is sealed in the other measuring chamber (2c) on the liquid surface, and the sealed state has an equal volume. Then, in this wet gas meter, the gas to be measured is fed into the measuring tank (1) from the gas introduction port (18) through a gas supply pipe (not shown) connected to the gas introduction adapter (18b). The fed gas is sequentially introduced into each measuring chamber (2c) with the rotation of the measuring drum (2), and each measuring chamber (2c)
Is discharged to the outside through the gas conduit (21), the gas outlet (19) and the gas outlet adapter (19b). On the other hand, the rotation status of the drum (2) at this time is transmitted to the counter device in the counter chamber (60) via the drum shaft (22), and the integrated flow rate value of the gas is measured there and The measured value will be displayed.

In this wet gas meter,
During the gas measurement, of the liquid level of the sealing liquid (10), the liquid level outside the drum (2), that is, the liquid level on the side where the overflow pipe (3) is installed becomes the pressure receiving surface, and the liquid level decreases. It will be. Therefore, during the gas measurement, the sealing liquid (10) does not flow into the overflow pipe (3) due to the gas pressure, so that the sealing liquid amount does not change and good measurement accuracy can be obtained. it can.

By the way, the wet gas meter of the present invention may have a structure without the upper drain port (7), and the reference liquid level (L) may be set only by the first method.

Further, the detailed structure such as the constitution of each part of the closed measuring tank (1), the structure of the measuring drum (2), the mounting structure of the overflow pipe (3) with respect to the mounting portion (8), etc. is variously changed from the embodiment. It is possible.

[0040]

According to the invention of claim 1, as a wet gas meter for setting the reference liquid level of the sealing liquid by the overflow method, the liquid level can be set in a very short time by a simple operation, so that the gas flow rate can be immediately measured. You can start measurement,
The structure is simple and can be manufactured at low cost, and the error in installing the meter is smaller than that of the external level gauge, and the reproducibility of the instrumental error is good.

According to the second aspect of the present invention, as the gas meter, even if shaking or inclination occurs when carrying the gas meter after setting the liquid level, the reference liquid level does not substantially fluctuate, and the location can be changed accordingly. Even if repeated gas measurement is performed, it is not necessary to reset the reference liquid level each time it moves, and it is possible to provide the next gas measurement very efficiently with the initial setting. .

According to the invention of claim 3, as the gas meter, the reference liquid level can be easily adjusted according to the pressure and type of the sample gas, the structure of the measuring drum to be used, the type of injection liquid, and other measurement conditions. It is possible to easily adjust the measuring volume of gas.

According to the fourth to sixth aspects of the present invention, as the gas meter, an overflow pipe, a bearing member for pivoting the drum shaft, and a gas conducting pipe are made of hard synthetic resin such as hard vinyl chloride. Since these materials are used, these parts have better corrosion resistance than conventional metal parts such as brass, and can measure corrosive gas, and the corrosive gas can be used as a sealing liquid. It can be used even if it is melted, the molding process is easy, the cost can be reduced, and the weight can be reduced. Moreover, since the overflow pipe can prevent the occurrence of oxidation and corrosion on the surface, there is less secular change in the wettability with the sealing liquid, and a stable liquid level can be maintained for a long period of time.
It is possible to prevent a decrease in measurement accuracy.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a wet gas meter according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the wet gas meter.

FIG. 3 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 1 ... Closed measuring tank 1a ... Measuring drum dipping section 2 ... Measuring drum 3 ... Overflow pipe 3a ... Opening upper end 4 ... Overflow chamber 5 ... Lower drainage port 6 ... Drainage passage 7 ... Upper drainage port 8 ... Mounting part 10 ... Sealing liquid 21 ... Gas conduit 22 ... Drum shaft 30, 40 ... Bearing L ... Standard liquid level

Claims (6)

[Claims] 1. A vertical tubular overflow pipe for setting a reference liquid level and an overflow chamber partitioned by a partition wall with respect to the dipping portion of the measuring drum are provided in a closed weighing tank for containing the measuring drum in a liquid-immersed state. A wet gas meter which is provided and communicates with a drainage passage extending from an overflow pipe to a lower drainage port at a bottom portion and is opened to a space of a dipping portion of a measuring drum above a reference liquid level. 2. The wet gas meter according to claim 1, wherein the overflow chamber is provided with an upper drain port that opens slightly below the reference liquid level. 3. The overflow pipe is mounted so that the height of the upper end of the opening is variable.
The wet gas meter described in. 4. The wet gas meter according to claim 1, wherein the overflow pipe is made of a hard synthetic resin. 5. The wet gas meter according to claim 1, wherein the bearing for pivotally supporting the drum shaft of the measuring drum in the measuring tank is made of substantially synthetic resin. 6. The wet gas meter according to claim 1, wherein the gas conduit for introducing or introducing gas into or from the measuring drum is made of a hard synthetic resin.