JPH06201430A - Drum for wet type gas meter and manufacture thereof - Google Patents

Abstract

PURPOSE:To manufacture a drum for wet type gas meter having high measurement accuracy easily at low cost. CONSTITUTION:In the drum for wet type gas meter, a resin blade 13 for partitioning a cylindrical resin drum 11 to form a weighing chamber is fit, at the outer peripheral edge thereof, in a groove 12 made in the inner face of the drum 11 and bonded in place. The drum is manufactured by mechanically etching a groove 12, into which the outer peripheral edge 13' of the resin blade 13 is fit to partition the drum 11 and forming a weighing chamber, in the inner face of the drum 11 under developed state, rounding the drum 11 and bonding the opposite ends thereof to form a cylindrical drum 11, fitting the outer peripheral edge 13' of the blade 13 in the groove 12 of the cylindrical drum 11, and then feeding an adhesive to the fitting part thereby bonding them integrally.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, a drum for a wet gas meter is
The inside of the thin-walled body is divided into multiple measuring chambers (usually 4 chambers) by the blades, but if the measuring chambers are not accurately divided into equal volumes, uneven rotation occurs and the gas flow rate is measured. The accuracy decreases. Therefore, when manufacturing the drum,
It is important that the blades be installed in the correct position with respect to the drum body without distortion.

Conventionally, in such a wet gas meter drum, a drum body and blades are formed of a brass plate or a stainless steel plate, and a marking line is previously formed on an inner surface of the drum copper in a developed state or a cylindrical state to form the drum body in a cylindrical shape. After being formed into a shape, an operator visually attaches the blades to the marking lines, and these are integrated by soldering to manufacture. Also,
When used for measuring a gas such as sulfurous acid gas that corrodes solder, it was necessary to join the blade and the drum body by argon welding.

Further, in order to facilitate the positioning of the drum body and the blade, a projection is provided on the outer peripheral edge of the blade, and a positioning hole corresponding to the projection is provided along the planned installation line of the blade on the inner surface of the drum body. There has also been attempted a method in which the drum body is formed into a cylindrical shape, and then the projection is fitted into a positioning hole to arrange the blades inside the drum body, and these are soldered.

[0005]

However, in both of the above-mentioned two methods, since the drum body and the blade are joined by soldering, the positional accuracy of the blade mounting position is poor, and the blade itself is distorted. Therefore, the wet gas meter manufactured by such a method has a problem of poor measurement accuracy.

That is, it is very difficult to visually or visually adjust the blades to the marking lines and solder or weld them to the correct positions with the soldering iron, and it takes time even for a skilled worker to perform, and there are individual differences. However, it was difficult to mass-produce accurate products. Even if the blade can be attached at an accurate position, the weight balance of the drum is lost due to variations in the amount of solder deposited, causing uneven rotation, which may reduce measurement accuracy. Of course, the weight balance has been corrected, but such a correction is carried out by placing it on a balance stand and soldering it to the opposite side of the unbalanced part, so the work was very difficult. In addition, the blade is inevitably warped due to the heat of soldering, and the degree of the warp varies depending on the product, which is also a cause of deterioration in measurement accuracy. Further, in the case of argon welding, since it is carried out at a high temperature, the distortion of the blade becomes extremely larger than that of soldering, and there is a drawback that the cost is several times higher than that of soldering.

Further, the latter method of assembling the projections provided on the blade and the positioning hole of the drum barrel cannot solve the problem of the blade warp because soldering work is required, and it is still in practical use. Not in.

Further, since the soldering work and the welding work with the soldering iron are similar to the so-called 3K work and require special skill, there is a background that it is very difficult to train successors. If such a situation continues, it may become impossible to manufacture a drum for a wet gas meter due to the aging of workers.

The present invention is directed to solving the above-mentioned problems, and a wet gas meter drum having high measurement accuracy and low cost, and a wet gas meter capable of easily manufacturing such a drum by a simple operation. The present invention is intended to provide a method for manufacturing a drum for use.

[0010]

In order to achieve the above-mentioned object, a drum for a wet gas meter of the present invention has a groove (12) formed in an inner surface of a cylindrical resin drum body (11),
The outer peripheral edge (13 ') of a resin blade (13) that divides the inside of the drum body (11) to form a measuring chamber is fitted and adhesively joined. The resin forming the drum body (11) and the blades (13) is preferably a transparent resin.

Further, in such a wet type gas meter drum, resin blades (13) are formed on the inner surface of the expanded resin drum body (11) to divide the inside of the drum body (11) to form a measuring chamber. Groove (12) with which the outer peripheral edge (13 ') is fitted
Are machined, the drum body (11) is rounded and both ends are adhesively joined to form a cylindrical drum body (11), and then the groove (11) of the cylindrical drum body (11) is formed. It can be manufactured by fitting the outer peripheral edge (13 ') of the blade (13) to 12) and pouring an adhesive into the fitting portion to join and integrate them.

The drum of the present invention and the drum manufactured by the method of the present invention are installed in a wet gas meter after attachment of accessories such as a drum washer and a drum cover.

[0013]

In the wet type gas meter drum according to the present invention, the blade (12) is mounted in the cylindrical drum body (11) at the groove (12) into which the outer peripheral edge (13 ') of the blade (13) is fitted. The position accuracy is good because it is accurately determined by the engraving position of (1), and the inside of the drum body (11) is accurately divided into equal parts to form an equal volume measuring chamber. As a result, it can be incorporated in a wet gas meter to achieve good measurement accuracy. Further, since the drum body (11) and the blades (13) are made of resin, and these are joined by an adhesive, uneven rotation and heat caused by variations in the amount of welding as in the case of soldering and heat Does not cause distortion. Furthermore, when the drum body (11) and the blades (13) are made of a transparent resin, the inside of the drum, that is, the presence or absence of deposits inside the drum, the drum body (11) and the blades (1)
Since the fitting state and the adhering state of 3) can be visually observed from the outside, it is easy to judge whether or not the drum can be reused based on these observations in the maintenance of the wet gas meter. Further, by forming these with a transparent resin, the outer peripheral edge (13 ′) of the blade (13) is fitted into the groove (12) of the drum body (11) while visually observing from the outside of the drum even in the manufacturing process of the drum. These operations can be performed more reliably and easily because they can be combined or the adhesive can be poured into the fitting portion. However, even with an opaque resin, the adhesive permeates the entire circumference due to the capillary phenomenon, so that if the groove width and the blade plate thickness match, the adhesive is surely bonded.

In the method of the present invention, the wet type gas meter drum as described above is preliminarily prepared from the resin drum cylinder (1
A groove (12) into which an outer peripheral edge (13 ') of a resin blade (13) is fitted is machined in the inner surface of (1), and the drum body (11) is rounded and both ends are adhesively joined. To form a cylindrical drum body (11), and then the groove (1
The drum is temporarily assembled by fitting the outer peripheral edge (13 ') of the blade (13) to 2). Next, by pouring an adhesive into these fitting portions, the drum barrel (11)
And the blades (13) are joined and integrated to complete a wet gas meter drum. The provisional assembling work of the drum can be easily performed because the outer peripheral edge (13 ') of the blade (13) is simply fitted into the groove (12), and the mounting position does not vary among operators. Further, the joining work can be performed extremely easily because the adhesive is simply poured.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a wet type gas meter drum and a method of manufacturing the same according to the present invention will be described with reference to the drawings.

Wet gas meter drum (1) shown in FIG.
In Fig. 11, (11) is a cylindrical drum body (11), and (13) is four blades that divide the inside of the drum body (11) into four equal parts to form four measuring chambers. is there. Further, reference numeral (17) is a drum cover.

The drum body (11) and the blades (1)
In 3), resin is used as the material. The type of resin is not particularly limited, and vinyl chloride resin, acrylic resin, polycarbonate resin and the like can be used. Among these, vinyl chloride resin is preferable because it has excellent chemical resistance, can be used for measuring various gases, and has good adhesiveness.

Four sets of grooves (12) are formed on the inner surface of the drum body (11). As shown in the development view of the drum body (11) in FIG. 2, the grooves are formed by shifting the positions along the peripheral edges of the drum body (11) in the width direction.
The parallel grooves (12a) (12c) of the book and these parallel grooves (12
a) An inclined groove (12) formed by connecting the end portions of (12c) and traversing the width direction of the drum body (11) in an inclined manner.
b) and the inclined groove (12b) of each groove (12) is
They are formed on the inner surface of the drum body (11) at four equal positions in the circumferential direction.

As shown in FIG. 3, each of the blades (13) has a rectangular partition plate (13) having an arcuate recess at one end.
b) both sides of the fan-shaped inlet blade (13a) and outlet blade (1)
3c) are connected in series, and as shown in FIGS. 1 and 4, the inlet vane (13a) and the outlet vane (13c) move in opposite directions at the boundaries (16a) (16b) with the partition plate (13b). It has been folded.

As shown in FIGS. 4 and 5, the outer peripheral edges (13 ') of the inlet blade (13a), the outlet blade (13c) and the partition plate (13b) are parallel to the groove (12). The grooves (12a) (12c) and the transverse groove (12b) are fitted into each other and firmly bonded by an adhesive. This adhesive is also not particularly limited and may be appropriately selected according to the resin used. However, it has good fluidity and easily enters between the groove (12) and the blade (13) due to the capillary phenomenon, and the resin is melted and softened to bond, and after bonding, excess adhesive evaporates. Therefore, an adhesive that does not remain around the fitting portion is preferable.

The wet gas meter drum (1) is preferably manufactured as follows. First, as shown in FIG. 2, a resin plate made of polyvinyl chloride or the like is cut out into a rectangular shape as a drum body (11), and in a developed state, a groove (12) is formed at each mounting position of the blade (13) by machining. The thickness of the plate is 1 /
2 is cut out to form adhesive parts (15a) and (15b). It should be noted that a hard resin that is likely to have a dimensional change may be annealed in advance. By doing so, secular change can be prevented.

On the other hand, as shown in FIG. 3, a resin plate made of polyvinyl chloride or the like is also used as the blade (13) of an integral shape in which the inlet blade (13a), the partition plate (13b) and the outlet blade (13c) are connected. It cuts out into a thing and bends the boundary parts (16a) (16b) of each part to a predetermined angle so that it may fit in the said groove (12). Four blades (13) having the same shape are manufactured.

Next, the rectangular drum body (11) is rounded with the engraved surface of the groove (12) inside, and the adhesive portions (15a) and (15b) at both ends are overlapped and bonded with an adhesive to form a cylindrical body. To do. Next, as shown in FIG. 4, the blade (13) is inserted into each groove (12) of the cylindrical drum body (11).
The outer peripheral edge (13 ') is fitted and temporarily assembled. Then, when the adhesive is poured into the fitting portion, the adhesive enters a minute gap between the groove (12) and the blade (13) by a capillary phenomenon, and the drum body (11) and the four blades (13) are separated from each other. It is firmly bonded and integrated.

The drum (1) thus manufactured
Can form four equal volume metering chambers because the mounting position of the vanes (13) is precisely determined according to the position of the groove (12). Moreover, the temporary assembly of the drum (1) is very simple because the blades (13) are simply fitted into the grooves (12), and the number of assembling steps is small. Furthermore, since joining and unifying are simply performed by pouring the adhesive, no special skill is required. When a volatile adhesive is used, an excessive amount of the adhesive that has not entered the gap between the groove (12) and the blade (13) evaporates,
It does not remain around the groove (12). Therefore, the static weight balance of the drum (1) is determined only by the drum barrel (11) and the blades (13), and no special balance adjustment is required.

Next, a drum washer (14) is bonded to the center of each blade (13) of the drum (1) thus manufactured using a jig, and at the inlet side of the drum (1), A drum cover (17) having a hole (17a) through which the rotary shaft communicates is covered and adhered, and further incorporated into a gas meter main body by a predetermined accessory to complete a wet gas meter.

In this embodiment, the groove (12) was engraved on the drum cylinder (1) in the expanded state and then rolled into a cylindrical shape. However, the groove was formed on the inner surface of the cylindrical drum cylinder, and Alternatively, the drum may be temporarily assembled and bonded and integrated by the same method as in this embodiment. Further, the shape of the blade is not limited as long as it can divide the inside of the drum body to form a measuring chamber of equal volume. For example, as in the present embodiment, the inlet blade, the partition plate and the outlet blade may be integrally formed and the boundary portion may be bent at a required angle, or the boundary portion which does not correspond to the partition plate and the inlet / outlet blade may be provided. The entire blade may be smooth or spiral.

[0027]

As described above, in the wet type gas meter drum of the present invention, since the mounting position of the blade is accurately determined by the groove formed in the cylindrical drum body, a metering chamber of equal volume is formed. As a result, the rotation irregularity of the drum is eliminated, and it is possible to achieve good measurement accuracy by incorporating it in a wet gas meter.
Furthermore, since the joining of the drum body and the blade is performed by an adhesive, there is no distortion of the blade itself due to heat unlike soldering, and the inside of the drum body can be accurately divided into equal parts to form an equal volume measuring chamber. In addition, since the drum is formed by bonding resin materials with an adhesive, various gases, including sulfur dioxide, and corrosive gases, which can only be handled by drums manufactured by high-cost argon welding, are used. It can be applied to measurement and can be made lighter than conventional metal drums. Further, by forming the drum body and the blades with a transparent resin, the groove of the drum body and the outer peripheral edge of the blade are fitted or bonded from the outside, or the inside of the drum body or the presence or absence of adhered matter on the blades. Since the condition can be observed, the manufacture and maintenance of the drum are reliable and easy.

By reducing the weight of the drum as described above, not only the weight of the wet gas meter main body can be reduced, but also the following effects can be obtained. In other words, since the moment of inertia during drum rotation can be reduced, it is possible to prevent sudden changes in flow rate or stop when measuring a large flow rate of gas.
Since the response is good and the amount of rotation moment in the opposite direction to the gear or the like connected from the drum rotation shaft to the counter portion is small, the measurement accuracy can be improved. Further, since the load applied to the drum bearing during measurement or transportation is reduced, wear of the drum bearing is reduced, the number of maintenance operations can be reduced, and the life of the wet gas meter can be extended.

Further, according to the method for manufacturing a wet gas meter drum of the present invention, a groove into which the outer peripheral edge of the blade fits is previously formed by machining on the inner surface of the drum body, and the drum body is rolled. After forming into a cylindrical shape, insert the blades into the groove to temporarily assemble the drum, and then pour the adhesive into these fitting parts to join the drum body and the blades together to form a unit for a wet gas meter drum. Is completed. Therefore, it is sufficient to assemble the drum by fitting the outer peripheral edge of the blade into the groove, and since the joining of these is performed by adhesion, the number of steps from assembling to joining can be reduced, and
Since these operations do not require any special skill, the manufacturing cost of the drum can be reduced. In addition, since excess adhesive does not evaporate and remains in the fitting part, or even if it remains, the influence on the weight is extremely small, it is not necessary to perform the skillful work of statically balancing the drum after joining. In this respect, the manufacturing cost of the drum can be reduced.

Further, since the groove is engraved by machining, the positional accuracy of the groove is very good, and the blade mounting position accurately determined by such groove is also very good in positional accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view of an assembled state in which a part of a drum according to an embodiment of the present invention is cut away.

FIG. 2 is a development view of a drum body forming the drum of the present embodiment.

FIG. 3 is a development view of blades constituting the drum of this embodiment.

FIG. 4 is a perspective view showing a method of assembling the drum of the present embodiment.

FIG. 5 is a schematic vertical sectional view of a drum and a drum cover of this embodiment.

[Explanation of symbols]

 11 ... Drum body 12 ... Groove 13 ... Blade 13 '... Outer peripheral edge

Claims (3)

[Claims] 1. A resin blade (13) which divides the inside of the drum body (11) into a groove (12) formed in the inner surface of a cylindrical resin drum body (11) to form a measuring chamber. A drum for a wet gas meter, characterized in that the outer peripheral edge (13 ') of the is fitted and adhesively joined. 2. The drum body (11) and blades (1)
The drum for a wet gas meter according to claim 1, wherein the resin forming 3) is a transparent resin. 3. An outer peripheral edge (13 ') of a resin blade (13) which divides the inside of the drum body (11) to form a measuring chamber is fitted on the inner surface of the resin drum body (11) in a developed state. The mating groove (12) is engraved by machining, and the drum cylinder (1
(1) is rolled and both ends are adhesively joined to form a cylindrical drum body (11).
In the groove (12) of (1), the outer peripheral edge (1
3 ') is fitted, and an adhesive is poured into the fitting part to join and integrate them, and a method for manufacturing a drum for a wet gas meter.