JP2915730B2 - Drum for wet gas meter and manufacturing method thereof - Google Patents

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 for 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 body is divided into a plurality of measuring chambers (usually four chambers) by the blades, but if these measuring chambers are not accurately divided into equal volumes, uneven rotation will occur and the gas flow rate will be measured. Accuracy decreases. For this reason, when manufacturing a drum,
It is important that the blades are mounted in precise positions on the drum cylinder 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 score line is previously formed on an inner surface of the expanded or cylindrical state of the drum copper, and the drum body is cylindrically mounted. After being formed into a shape, an operator visually assembles the blades in accordance with the ruled lines, and integrally manufactures the blades by soldering. Also,
When used for measurement of a gas that corrodes solder, such as sulfurous acid gas, it was necessary to join the blade and the drum body by argon welding.

Further, in order to facilitate the positioning between 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 a line where the blade is to be mounted on the inner surface of the drum body. After the drum body is formed into a cylindrical shape, a method has been attempted in which the projections are fitted into positioning holes, the blades are arranged in the drum body, and these are soldered.

[0005]

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

That is, it is very difficult to visually align the wings with the ruled lines and solder or weld them to an accurate position with a soldering iron, and it takes a long time even for a skilled worker, and there are individual differences. However, it was difficult to mass-produce an accurate product. Further, even if the blades can be mounted at an accurate position, the weight balance of the drum is lost due to the variation in the amount of solder deposited, causing rotation unevenness, and the measurement accuracy may be reduced. Of course, the weight balance has been corrected, but such correction has been made by placing it on a balance table and soldering it to the opposite side of the unbalance, which made the work very difficult. In addition, it is inevitable that the blades warp due to the heat of soldering, and the degree of warping varies depending on the product, which also contributes to a decrease in measurement accuracy. Further, in the case of argon welding, since the welding is performed at a high temperature, there is a disadvantage that the blade distortion is extremely large as compared with the soldering, and the cost is several times higher than that of the soldering.

Also, the latter method of assembling using the projections provided on the blades and the positioning holes of the drum body cannot solve the problem of the warpage of the blades because soldering work is required, and has not yet been put to practical use. Not in.

Further, the soldering and welding operations using a soldering iron are similar to so-called 3K operations and require special skills, so that it is very difficult to train successors. If such a situation continues, the aging of the workers may make it impossible to manufacture a drum for a wet gas meter.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by providing a low-cost wet gas meter drum with good measurement accuracy and a wet gas meter capable of easily manufacturing such a drum by a simple operation. It is an object of the present invention to provide a method of manufacturing a drum for use.

[0010]

In order to achieve the above object, a drum for a wet gas meter according to the present invention has a cylindrical shape.
A plurality of blades (13) are arranged in the circumferential direction inside the body (11).
The drum cylinder (11) is arranged at equal intervals with its position shifted.
Inside the space, divided by the plurality of blades (13).
A plurality of volume chambers are provided along the circumferential direction,
Up to the drum cylinder (11)
Flow from one end of the nozzle to the measuring chamber through the space between adjacent blades (13).
The sample gas entered replaces the sealed liquid with the rotation of the drum,
From the other end of the drum body (11) to the adjacent blade (13)
Through the wet gas meter drum
And the drum body (11) and the blade (13)
A blade made of a synthetic resin;
Continuously fits the blade along the joint area with the outer peripheral edge (13 ')
A joint groove (12) is provided, and the groove (1
2) the outer peripheral edge (13 ') of the blade (13) is fitted
With the adhesive poured along the fitting
And the drum body (11) and the blade (13) are joined.
The gist is an integrated one. Further in the present invention
Forming the drum body (11) and the blade (13)
It is preferable that the synthetic resin to be used has a configuration made of a transparent resin .

Further, such a wet gas meter drum can employ, for example, the following manufacturing method. That is, in producing the drum body (11),
To prepare a belt-shaped drum body constituting plate made of synthetic resin
In addition, the blade (13) is made of a synthetic resin.
Prepare the material and place it on one side of the drum
In a predetermined area, a plurality of blade fitting grooves are machined.
(12) is engraved, and the drum body constituting plate is
Roll it inside and round it into a cylinder, glue the ends together and circle
Forming a cylindrical drum cylinder (11), and then
Each outer edge (13 ') of the synthetic resin blade (13) is
Fit into the number of grooves (12) and arranged in a predetermined state
In this state, the outer peripheral edge of the blade (13 ') and the groove (1)
2) An adhesive is poured into a fitting portion with the drum body (1).
1) and the blade (13) are joined and integrated.
A method for manufacturing a drum for a wet gas meter can be adopted.

The drum of the present invention and the drum manufactured by the method of the present invention are assembled into a wet gas meter after attaching accessories such as a drum washer and a drum cover.

[0013]

In the wet gas meter drum according to the present invention, the mounting position of the blade (12) in the cylindrical drum body (11) is determined by the groove (12) in which the outer peripheral edge (13 ') of the blade (13) is fitted. ) Is accurately determined by the engraving position, so that the positional accuracy is good, and the inside of the drum cylinder (11) is accurately divided equally to form a measuring chamber of equal volume. As a result, good measurement accuracy can be achieved by incorporating the device into a wet gas meter. Further, since the drum body (11) and the blade (13) are made of resin, and their joining is performed by an adhesive, there is uneven rotation due to a variation in the welding amount as in the case of soldering, heat fluctuation, and the like. No distortion is caused. Further, when the drum body (11) and the blade (13) are formed of a transparent resin, the state of the inside of the drum, that is, the presence or absence of extraneous matter inside the drum, the drum body (11) and the blade (1).
Since the fitting state and the bonding state in 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 them from 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 outside the drum even in the process of manufacturing the drum. These operations can be performed more reliably and easily because the bonding can be performed or the adhesive can be poured into the fitting portion. However, even if it is an opaque resin, the adhesive penetrates the entire circumference by the capillary phenomenon, so that if the groove width matches the plate thickness of the blade, the bonding can be performed reliably.

In the method of the present invention, the drum for a wet gas meter as described above is prepared in advance by using a resin drum cylinder (1).
A groove (12) into which the outer peripheral edge (13 ') of the resin blade (13) fits is cut in the inner surface of 1) by machining, and the drum body (11) is rounded and both ends are adhesively bonded. To form a cylindrical drum body (11),
The drum is temporarily assembled by fitting the outer peripheral edge (13 ') of the blade (13) into 2). Next, an adhesive is poured into these fitting portions, so that the drum body (11)
And the blade (13) are joined and integrated to complete a wet gas meter drum. The temporary assembling operation of the drum can be easily performed because only the outer peripheral edge (13 ') of the blade (13) is fitted into the groove (12), and there is no individual difference in the mounting position between operators. Also, the joining operation can be performed very easily because only the adhesive is poured.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a drum for a wet gas meter according to the present invention;

Drum for wet gas meter (1) shown in FIG.
In the above, (11) is a cylindrical drum cylinder (11), and (13) is four blades that divide the inside of the drum cylinder (11) into four equal parts to form four measuring chambers. is there. Reference numeral (17) is a drum cover.

The drum body (11) and the blade (1)
3) uses a synthetic resin as a material. The type of the synthetic resin is not particularly limited, and a vinyl chloride resin, an acrylic resin, a polycarbonate resin, or the like can be used. Among these, a vinyl chloride resin is preferable because it is particularly excellent in chemical resistance, can cope with the measurement of various gases, and has good adhesiveness.

Four sets of grooves (12) are formed in the inner surface of the drum body (11). As shown in a development view of the drum cylinder (11) in FIG. 2, each groove is engraved at a position shifted along both peripheral edges in the width direction of the drum cylinder (11).
The parallel grooves (12a) and (12c) and the parallel grooves (12
a) An inclined groove (12) formed by connecting the ends of (12c) so as to cross 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 at four equally spaced positions in the circumferential direction on the inner surface of the drum body (11).

As shown in FIG. 3, each of the blades (13) has a rectangular partition plate (13) having an arcuate concave portion at one end.
b), fan-shaped inlet blades (13a) and outlet blades (1)
3c) are connected in series, and as shown in FIG. 1 and FIG. 4, the inlet blade (13a) and the outlet blade (13c) are in opposite directions at the boundaries (16a) (16b) with the partition plate (13b). It is bent.

As shown in FIGS. 4 and 5, each of the outer peripheral edges (13 ') of the inlet blade (13a), the outlet blade (13c), and the partition plate (13b) is parallel to the groove (12). The grooves (12a) and (12c) and the transverse groove (12b) are fitted into each other and are firmly joined by an adhesive. This adhesive is not particularly limited either, 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) by the capillary phenomenon, and is bonded by melting and softening the resin, and after bonding, excess adhesive evaporates. It is preferable that the adhesive does not remain around the fitting portion.

The wet gas meter drum (1) is preferably manufactured as follows . Previously not a, as shown in FIG. 2, a resin plate made of polyvinyl chloride or the like as a drum cylinder (11) a strip of the drum body structure plate cut into a rectangle
On the other hand, grooves (12) are formed at the respective mounting positions of the blades (13) by machining , and at the overlapping margins at both ends, 1/2 of the plate thickness is cut out to form the bonding portions (15a) (15b).
To form Note that an annealing process may be performed in advance for a hard resin that may change its dimensions. By doing so, aging can be prevented.

On the other hand, as shown in FIG. 3, a resin plate also made of polyvinyl chloride or the like is used as the blade (13) to form an integral shape in which the inlet blade (13a), the partition plate (13b), and the outlet blade (13c) are connected. The boundary (16a) (16b) of each part is bent at a predetermined angle so as to match the groove (12). The four blades (13) are manufactured in the same shape.

Next, the belt-shaped drum body constituting plate is rolled with the cut surface of the groove (12) inside, and the adhesive portions (1
5a) (15b) is overlapped and joined with adhesive to form a cylinder
Form a drum shell (11) in the shape of. Next, as shown in FIG. 4, each groove of the cylindrical drum body (11) (1
2) The outer peripheral edge (13 ') of the blade (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. Strongly adhered and integrated.

The drum (1) manufactured in this way
Since the mounting position of the blade (13) is accurately determined according to the position of the groove (12), four equal-volume measuring chambers can be formed. In addition, the provisional assembly of the drum (1) is very simple since only the blades (13) are fitted into the grooves (12), and the number of assembling steps can be reduced. Further, since the joining and integration are only performed by pouring the adhesive, no special skill is required. If 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 body (11) and the blade (13), and there is no need to particularly adjust the balance.

Next, a drum washer (14) was adhered to the center of each blade (13) of the drum (1) manufactured as described above using a jig, and at the entrance side of the drum (1), A drum cover (17) having a hole (17a) through which a rotating shaft passes is covered and adhered, and further assembled into a gas meter main body with predetermined accessories to complete a wet gas meter.

In the present embodiment, the groove (12) is formed in the unfolded drum body (1) and then rounded into a cylindrical shape. However, the groove is formed on the inner surface of the cylindrical drum body, and thereafter the groove is formed. Alternatively, the drum may be temporarily assembled and bonded and integrated in the same manner as in this embodiment. The shape of the blade is not limited as long as it can form a measurement chamber having the same volume by dividing the inside of the drum body. For example, as in the present embodiment, the entrance blade, the partition plate and the exit blade may be integrally formed and the boundary portion may be bent to a required angle, or the boundary portion is not provided at a portion corresponding to the partition plate and the entrance / exit blade. The whole blade may be a smooth spiral.

[0027]

As described above, in the wet gas meter drum according to the present invention, since the mounting position of the blade is accurately determined by the groove formed in the cylindrical drum body, a measuring chamber having an equal volume is formed. As a result, uneven rotation of the drum is eliminated, and good measurement accuracy can be achieved by incorporating the drum into a wet gas meter.
Further, since the bonding between 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 equally to form a measuring chamber of equal capacity. In addition, since the drum is formed by bonding a resin material with an adhesive, various types of gas including sulfurous acid gas and corrosive gas that can only be used with drums manufactured by costly argon welding can be used. It can be applied to measurement and can be lighter than a conventional metal drum. Furthermore, the drum of the present invention
The entire outer peripheral area is fitted into the groove of the drum cylinder and bonded and integrated.
So that the entire area where the blades are joined
It can be surely integrated with high adhesive strength,
Sufficient rigidity can be obtained across. For this reason,
Effectively prevents blade deformation when rotating
And high measurement accuracy can be maintained. Further, by forming the drum body and the blades with a transparent resin, the inside of the drum body and the outer peripheral edge of the blades can be fitted or adhered from outside, or the inside of the drum body or the blades can be checked for any foreign matter. Since the state can be observed, the production and maintenance of the drum can be reliably and easily performed.

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 rotation of the drum can be reduced, sudden changes in flow rate or stoppage when measuring large
Since the responsiveness is good and the amount of rotational moment in the reverse direction with respect to a gear or the like connected from the drum rotation shaft to the counter portion is small, measurement accuracy can be improved. Further, since the load applied to the drum bearing during measurement or transportation is reduced, the 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.

According to the method of manufacturing a drum for a wet gas meter of the present invention, a groove into which the outer peripheral edge of the blade is fitted is formed in the inner surface of the drum body in advance by machining, and the drum body is rounded. After being formed into a cylindrical shape, the blades are inserted into the grooves to temporarily assemble the drum, and then the adhesive is poured into these fitting portions, whereby the drum body and the blades are joined and integrated to form a drum for a wet gas meter. Is completed. Therefore, assembling of the drum is only required to fit the outer peripheral edge of the blade into the groove, and since these are joined by bonding, the number of steps from assembly to joining can be reduced, and
Since these operations do not require special skill, the production cost of the drum can be reduced. In addition, the excess adhesive does not evaporate and remains in the fitting portion, or even if it remains, the influence of weight is very small, so that it is not necessary to perform a skillful operation of balancing the drum statically after joining. In this respect, the manufacturing cost of the drum can be reduced.

Since the grooves are formed by machining, the position accuracy of the grooves is very good, and the position of the blades accurately determined by such grooves is very good.

[Brief description of the 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 barrel constituting the drum of the present embodiment.

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

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

FIG. 5 is a schematic longitudinal sectional view of a drum and a drum cover of the present embodiment.

[Explanation of symbols]

 11 drum drum 12 groove 13 blade 13 'outer peripheral edge

Claims (3)

(57) [Claims] Inside of 1. A cylindrical drum body (11), double
Number of blades (13) are shifted at equal intervals in the circumferential direction.
The plurality of blades are placed inside a drum body (11).
The measurement chamber partitioned by (13) is duplicated along the circumferential direction.
Immersed in the sealing liquid to a predetermined liquid level
In the state, the blades adjacent to each other from one end side of the drum body (11)
(13) The sample gas flowing into the measuring chamber through the space
The rotation of the drum replaces the sealing liquid, and the other end of the drum body (11)
So that it flows from the side between adjacent blades (13)
In the wet gas meter drum, the drum body (11) and the blade (13)
And the outer peripheral edge (13 ') of the blade in the drum body (13).
The groove (12) for fitting the blade is continuously formed along the joining area of
And an outer peripheral edge (13 ') of the blade (13) in the groove (12).
In the state where was fitted, it was poured along the fitting part
With the adhesive, the drum cylinder (11) and the blade (1)
3) a drum for a wet gas meter, wherein the drum is integrally joined . 2. The drum cylinder (11) and the blade (1).
The synthetic resin forming 3) is made of a transparent resin.
4. The drum for a wet gas meter according to 1.). 3. A cylindrical drum body (11) has a plurality of insides.
Number of blades (13) are shifted at equal intervals in the circumferential direction.
The plurality of blades are placed inside a drum body (11).
The measurement chamber partitioned by (13) is duplicated along the circumferential direction.
Immersed in the sealing liquid to a predetermined liquid level
In the state, the blades adjacent to each other from one end side of the drum body (11)
(13) The sample gas flowing into the measuring chamber through the space
The rotation of the drum replaces the sealing liquid, and the other end of the drum body (11)
So that it flows from the side between adjacent blades (13)
A method for manufacturing a drum for a wet gas meter, the method comprising:
And a blade made of synthetic resin is prepared as the blade (13).
In advance, a mechanical processing is applied to a predetermined area on one surface of the drum body constituting plate.
A plurality of blade fitting grooves (12) are engraved by machining, and the drum body constituting plate is formed into a cylindrical shape with one surface side inside.
Roll it up and glue both ends together to form a cylindrical drum cylinder (1
1), and then each outer peripheral edge of the plurality of synthetic resin blades (13).
(13 ') is fitted into each of the plurality of grooves (12).
It is arranged in a predetermined state, and in that state, the outer peripheral edge of the blade (13
') And an adhesive is poured into a fitting portion between the groove (12) and the groove (12).
The drum body (11) and the blade (13) are joined and integrated.
A method for manufacturing a drum for a wet gas meter.