JP2650832B2 - 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 wet gas meter for measuring the flow rate of various gases by utilizing the rotation of a measuring drum immersed in a liquid caused by the flow of gas.

[0002]

2. Description of the Related Art In general, a gas meter of this kind has a cylindrical measuring drum, which is divided into a plurality of measuring chambers arranged in a circumferential direction in a closed casing, and seals liquid such as water to a position slightly higher than the horizontal drum shaft. Each measuring chamber is held rotatably in a state of being immersed in the liquid, and each measuring chamber is sealed from the other measuring chambers on the liquid surface with the liquid, so that the sample gas introduced into the casing accompanies rotation of the drum. By utilizing the fact that the gas flows into and out of each measuring chamber sequentially, the integrated flow value of the gas is measured from the rotation speed of the drum.

[0003] There are various types of casings of such a wet gas meter, such as a front and rear split type and a vertical split type, and have a plurality of case members. Conventionally, a flat gasket or O-ring such as NBR coated with a sealant is interposed at the joint to prevent a decrease in measurement accuracy due to leakage of the sample gas or sealing liquid.
A structure is adopted in which the two cases are tightly joined by screws.

[0004]

However, in the conventional casing structure in which a gasket or an O-ring is interposed at the joint of the case components, the sealing property is insufficient, and the leakage of the sample gas or the sealing liquid is high. It occurs frequently and needs to be repaired each time.In particular, in the case of chemically stable oil with low vapor pressure, which has recently been widely used as a sealing liquid instead of water, a special sealing agent for oil is used in the gasket. There is a drawback that even when the liquid is applied, liquid leakage is more likely to occur as compared with the water seal type. Further, in the case of a gasket, it takes time to apply a sealant, and it is difficult to adjust the degree of compression by tightening a screw. This requires skill, and the outer peripheral edge of the gasket is exposed to the outside, so that the appearance of the casing is changed. There was a problem that was bad.

Further, the O-ring system has a problem that the O-ring mounting groove provided in the case joining portion needs to be formed by machining which requires high cost, resulting in an increase in cost. .

In view of the above-mentioned circumstances, the present invention, as a wet gas meter, has excellent sealing properties of a casing accommodating a measuring drum, does not leak sample gas or sealing liquid, and can maintain high measurement accuracy for a long time. An object of the present invention is to provide a casing which is easy to assemble, has good appearance, and can be manufactured at low cost.

[0007]

In order to achieve the above object, a wet gas meter according to the present invention comprises a measuring drum (2).
(1), which is stored in a liquid immersion state, is divided into a lower case (3) made of a casting that forms a tank body above the reference liquid level (L) and an upper case (4) that forms a lid thereof, Opening edge portions (31) and (4) of these two cases facing each other.
A concave step (5) is formed on at least one of the inner peripheral sides of the opposing peripheral end faces (31a) and (41b ) in 1) , and the concave step (5) has a height higher than that of the concave step (5). Projection dimension is
A single convex ridge (6) with a small semicircular cross section extends all around.
And the opposed peripheral end faces (31a) (4)
1a), on the other inner peripheral side, the tip is the single ridge.
Triangular cross-section double ridges facing (6) (7)
(7) is formed over the entire circumference, and the concave step (5) is formed
In a mode in which the gasket (9) is fitted,
The opening edges (31) and (41) are joined, and
At the edge, the ridge (6) of the gasket (9)
A fastener (8a) penetrating an outer region than (7)
(8b) is pierced, and by fastening the fastener,
The gasket (9) is provided with the single and double ridges (6).
(7) is sandwiched and compressed, and the outer peripheral side of the opposing peripheral end faces (31a) and (41a) is directly joined.

[0008]

According to the present invention, the casing (1) is used as a reference.
Lower case (3) and upper part above liquid level (L)
Divided into two cases (4).
(3) Gasket interposed between opening edges of (4)
(9) Gasket (9) without contacting the sealing liquid
Swells due to impregnation of sealing liquid, causing gas leakage and liquid leakage
Can be prevented. Further, the gasket (9) interposed at the joint between the lower case (3) and the upper case (4) is fitted into the concave step (5) on the inner peripheral side of the opposing peripheral end faces (31a) (41a), Since the two cases (3) and (4) are in direct contact with each other on the outer peripheral side, even if the gasket (9) is completely compressed even if the screws (8a) and (8b) are tightened to a certain degree or more, However, since the gasket (9) is compressed by the ridges (6) and (7), a sufficient sealing property is exhibited in the compressed portion without specially applying a sealant, and the gasket (9) is externally provided. Gasket (9) is not exposed.

Further, the entire gasket (9) is strongly compressed.
So that the restoring force of the case (3) and (4)
Does not act, for example, the upper case (4) is deformed.
There will be no inconveniences such as inconvenience. Also screw (8a)
(8b) is not excessively tightened beyond a certain level
So, whoever tightens the screws (8a) (8b)
Can be set moderately, and even if you are not an expert,
Easy and accurate.

In general, since a gasket made of rubber or soft synthetic resin such as NBR has a property of expanding including a sample gas and a sealing liquid, the gasket is compressed over the entire opposite end surface of the case member as in the prior art. When the gasket is interposed as described above, the gasket is displaced from the joint due to the expansion and loses the sealing function, resulting in gas leakage and liquid leakage. However, the gasket according to the present invention (9)
Then, as described above, since it is not in a state of being strongly compressed as a whole, even if it expands, it fits in the concave step (5), and the sealing performance is increased contrary to the conventional case. In addition, screw (8
a) Fixing tools such as (8b) penetrate gasket (9).
The gasket (9) is fixed in position.
The gasket (9) is swollen and dried, etc.
To prevent misalignment even when expanding or contracting.
And stable sealing performance can be maintained for a long time.

On the other hand, the facing peripheral end surfaces (31a) and (41a) of the two cases (3) and (4) require good airtightness and high flatness. Immediately after manufacturing the case, the opposing peripheral end faces (31a) and (41a) are hit with a hammer or the like to correct the distortion. In this case, by forming the ridges as described above (6) to the recessed step (5), is set smaller than the step height of the recessed step a projecting dimension of the convex portion (6) (5) Is
Therefore, when the distortion is corrected by hitting the peripheral end surface (31a), there is no possibility that the ridge (6) is hit and damaged.

In addition, a single convex ridge (6) having a semicircular cross section is provided.
Double ridges (7) (7) with triangular cross section mesh
To compress the gasket (9) in the form
The sealing performance between the two cases (3) and (4) by the compressed part
Even better.

A ridge for further compressing the gasket (9)
(6) and (7) are those with semicircular cross section and those with triangular shape.
And have no relative shape to each other.
So, for example, the shape
In contrast to those that have a relative relationship to each other,
It is not necessary to form accurately on the contrary, requires high processing technology
, And can be easily processed.

[0014]

1 and 2 show a wet gas meter (10) according to an embodiment of the present invention. This gas meter (1
0) is provided with an instrument room (10b) having a built-in gas amount integrating / displaying mechanism in front of a closed measuring tank (10a) containing a measuring drum (2) immersed in a sealing liquid (11). ing. Casing (1) constituting closed measuring tank (10a)
Above the reference liquid level (L) of the sealing liquid (11), a lower case (3) forming a tank body made of an aluminum alloy or a stainless alloy cast by a lost wax method, and a lid thereof. It is divided into an upper case (4) made of a hard resin molded product or an aluminum alloy similar to the above, and the lower case (3) is integrated with the casing of the instrument room (10b).

The substantially rectangular opening edge (31) at the upper end of the lower case (3) is formed in a thick-walled and flange-like shape, and is entirely formed on the inner peripheral side of the peripheral end surface (31a). And a convex ridge (6) having a semicircular cross section is formed at a position near the inner peripheral edge of the concave step (5). In this case, the projecting dimension of the ridge (6) is set to be smaller than the step height of the concave step (5).

On the other hand, the opening edge (41) at the lower end of the upper case (4) is set to a substantially rectangular shape whose outer peripheral edge coincides with the lower case (3) side. On a flat peripheral end surface (41a) facing the end surface (31a),
Double ridges (7) and (7) having a substantially triangular cross section are formed over the entire circumference so that the middle between the two ridges faces the ridge (6) on the lower case (3) side.

The casing (1) has an NB on the concave step (5).
With the flat gasket (9) made of rubber such as R or a soft synthetic resin fitted, the opening edges (31) and (41) of both cases (3) and (4) are joined together and attached at a peripheral key point. By screwing the screws (8a) and (8b) from above into the opening edge (31) through the opening edge (41) and tightening, the two cases (3) and (4) are connected and integrated to form a closed measuring vessel (10).
Configure a). In addition, these mounting screws (8a) (8
b) is set so as to penetrate the gasket (9) outside the convex ridges (6) and the convex ridges (7) and (7).

In the above connection state, both cases (3)
The gasket (9) interposed on the inner peripheral side even if the mounting screws (8a) and (8b) are strongly tightened because the (4) comes into direct contact on the outer peripheral side of the opposed peripheral end faces (31a) and (31b).
Is not compressed more than necessary. Therefore, there is no need to particularly adjust the degree of tightening of the mounting screws (8a) (8b), and the casing (1) can be easily assembled even by a non-expert. Thus, the gasket (9) is compressed between the ridges (6) and the ridges (7) and (7) arranged in a meshing state as shown in FIGS.
Since the sealability between the two cases (3) and (4) is sufficiently ensured by the compressed portion, there is no need to apply a sealant to the gasket (9) as in the conventional case. Further, since the gasket (9) is not exposed to the outside, the casing (1) has a clean and good appearance.

The measuring drum (2) is made of a hard synthetic resin or a metal, and is divided into a short cylindrical drum body (2a) and a plurality of measuring chambers (20). And a donut-shaped end plate (2c) attached to one end of the drum cylinder (2a). Both ends of a pivot shaft (21) fixed to the axis of the donut end plate (2c). By being supported by the bearing portion (3b) of the lower case (3), it is rotatably accommodated in the closed measuring tank (10a) around the horizontal pivot shaft (21). Each measuring chamber (20) of the measuring drum (2) is provided with a closed measuring tank (10a).
By injecting a sealing liquid (11) such as water or oil having a low vapor pressure into the inside up to a predetermined reference liquid level (L), the liquid level is sealed to the other measuring chambers (20) by liquid. In addition, the volume is set to be equal in the sealed state.

In the closed measuring tank (10a), the main pipe part (12a) of the gas conducting pipe (12) is fitted to the pipe mounting parts (3c) (4c) of both cases (3) (4) at both upper and lower ends. And a branch pipe part (12b) branched from the main pipe part (12a) is inserted into a space (22) formed inside the end plate (2c) of the measuring drum (2), and its tip is Open above the liquid level in the space (22). In addition, a gas inlet (13) is provided in the upper wall (4b) of the upper case (4).
a) and a gas conduit (12) via a pipe fitting (4c).
And a gas discharge port (13b) communicating with the gas inlet port (13b). A gas introduction adapter (15a) and a gas discharge adapter (15b) are rotatably connected to the gas discharge port (13a) and (14b), respectively. Are linked. (16a)
(16b) is a level which serves as an index for installing the casing (1) in an inclined state at the time of gas measurement.

In the wet gas meter (10) having the above configuration, a gas pipe supply pipe (not shown) is connected to the gas introduction adapter (15a), and the object to be measured is inserted into the closed measuring tank (10a) from the gas introduction port (13a). Of gas. Then
The sent gas is sequentially introduced into each measuring chamber (20) with the rotation of the measuring drum (2), and is discharged to the outside through the gas conduit (12) as the measuring chamber (20) moves into the liquid. The integrated gas flow rate is measured from the rotation speed of the drum (2) during the feeding.

In this wet gas meter (10)
Means that the casing (1) is higher than the reference liquid level (L).
Divided into a lower case (3) and an upper case (4).
Because it is intended to be, the opening edge portions of the casing (3) (4)
Gasket (9) interposed in contact with sealing liquid
Gasket (9) swells due to impregnation of the sealing liquid
Gas and liquid leaks can be prevented from occurring.

In addition, during the operation of the gas meter,
The gasket (9) swells by adhering to the gasket (9)
Even, convex portion (6) and the ridges (7) vertical section of the case by the compressed gasket (9) between the (7) (3)
Since the junction (4) is reliably sealed, rather than the leakage of gas and working liquid occurs, high measurement accuracy is obtained. Further, since the gasket (9) is not in a state of being strongly compressed as a whole, there is no danger that the gasket (9) will protrude to the inside even if expanded by containing the sample gas or the sealing liquid. Better. More gasket
(9) Since the whole is not strongly compressed, its decompression
The force does not act on the cases (3) and (4), for example
Problems such as deformation of the upper case (4) may occur.
Absent. Also, screws (8a) and (8b) are tightened more than a certain amount.
The screws (8a) and (8b)
Anyone can set the degree of attachment moderately and not a skilled person
In both cases, screwing work can be performed easily and accurately, and
Smeter assembly work can be performed easily.

Further, the screws (8a) and (8b)
Gasket (9) because it penetrates through (9)
Gasket (9)
Even if you try to expand and contract due to swelling and drying, etc.
Can be reliably prevented, and a stable seal
Can be.

Moreover, a ridge for compressing the gasket (9).
(6) and (7) are those with semicircular cross section and those with triangular shape.
And have no relative shape to each other.
So, for example, the shape
Unlike those that have a relative relationship to each other,
It is not necessary to form shapes and dimensions relatively accurately.
No processing technology is required, so it can be easily processed
You.

In addition, there is no need to form an O-ring mounting groove or the like, and it is not necessary to use a high-cost machining process to form the O-ring mounting groove.

On the other hand, the facing peripheral end faces (31a) and (41a) of the two cases (3) and (4) require good airtightness and high flatness. Immediately after manufacturing (4), in a state where the case is not cooled, the opposed peripheral end faces (31a) (41a)
Is hit with a hammer or the like to correct the distortion. At this time, in the present embodiment, the convex ridge (6) is formed in the concave step (5), and the projecting dimension of the convex ridge (6) is set smaller than the step height of the concave step (5). Therefore, when the distortion is corrected by hitting the peripheral end surface (31a), the ridge (6) is not hit and the ridge (6) can be prevented from being damaged, thereby preventing the occurrence of defective products. can do.

In the above embodiment, the concave step (5) for fitting the gasket (9) is provided on the lower case (3) side. The two cases (3) and (4) may be provided so as to face each other. Further, the ridge for compressing the gasket (9) may be provided only on one side of the upper and lower opposing surfaces at the position of the concave step (5), and the cross-sectional shape thereof can be variously set. Others
The wet gas meter of the present invention can be variously modified in design other than the embodiment with respect to the detailed configuration of the casing (1) and the measuring drum (2).

[0029]

According to the present invention, as a wet gas meter, the casing for accommodating the measuring drum is excellent in sealing property, the sample gas and the sealing liquid do not leak, high measurement accuracy can be maintained for a long time, and the casing of the casing can be maintained. It is easy to assemble and shows good appearance, and there is no damage on the ridge,
What can be manufactured at low cost can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a wet gas meter according to one embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a closed measuring tank of the gas meter.

FIG. 3 is a longitudinal sectional view of a main part showing a joining operation of a lower case and an upper case of a casing in the gas meter.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Metering drum 3 ... Lower case 4 ... Upper case 5 ... Concave step part 6 ... Convex ridge part 7 ... Convex ridge part 8a ... Mounting screw 8b ... Mounting screw 9 ... Gasket 10 ... Wet gas meter 11 ... Sealing liquid 31 ... Opening edge 31a ... Peripheral end surface 41 ... Opening edge 41a ... Peripheral end surface L ... Reference liquid level

Claims (1)

(57) [Claims] 1. A casing for housing the metering drum in the liquid immersion state, casting forms a tank body in higher than the reference liquid level
The lower case is divided into a lower case made of a product and an upper case forming a lid thereof, and a concave step is formed on at least one inner peripheral side of the opposing peripheral end surfaces at the opposing opening edges of the two cases. The protrusion dimension is smaller than the height of the concave step
A single convex ridge with a semicircular cross section is formed over the entire circumference.
At the other inner peripheral side of the opposing peripheral end face,
A double ridge having a triangular cross section facing the single ridge.
The two parts are formed in such a manner that a part is formed over the entire circumference and a gasket is fitted in the concave step part.
The opening edges of the base are joined, and both opening edges
The gasket penetrates the area outside the ridge.
The fastener is penetrated as described above, and the gasket is brought into contact with the one by tightening the fastener.
While being compressed by being sandwiched between heavy and double ridges ,
A wet gas meter in which the outer peripheral side of the opposing peripheral end face is directly joined.