JPH0926345A - Wet gas meter drum and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet gas meter drum which can be simply and precisely assembled even by a less-skilled worker and wherein the yield is improved and the cost is reduced, and further high measurement accuracy is obtained when it is used for a gas meter. SOLUTION: A cylindrical drum barrel 1 which consists of an integratedly formed object of seamless synthetic resin and is provided with a plurality of blade board installing recessed grooves 11 on specified positions of its inner periphery surface, and a plurality of blade boards 2 which consist of integratedly formed object of seamless synthetic resin and is provided with an inlet blade part 23 and an outlet blade part 24 on both sides of a partition board part 22, respectively, so as to extend in mutually-inverse directions, are provided. The outer periphery edge of each blade board 2 is engaged with each recessed groove 11 of the drum barrel, thus joined and integrated.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A wet gas meter used for measuring a gas flow rate is provided with a cylindrical drum which is partitioned by a plurality of vane plates to form a plurality of measuring chambers, and the drum is rotated in a sealed casing. The measuring chambers of the drum are freely accommodated and are sealed from the other measuring chambers on the liquid surface by the sealing liquid injected into the casing. Then, utilizing the fact that the sample gas introduced into the casing sequentially flows into and discharges from the respective measurement chambers as the drum rotates, the integrated flow rate value of the gas is measured from the rotational speed of the drum.

In this wet gas meter drum, a drum body and blades made of metal such as stainless steel or brass have been put into practical use from the beginning. When manufacturing this metal drum, a scribe line is put along the blade plate attachment position on a strip-shaped metal thin plate, and the ends of the thin plate are joined to form a cylindrical drum cylinder, while a metal of a predetermined shape is formed. By bending the thin plate or joining a plurality of metal thin plate pieces to form a vane plate, and by aligning the outer peripheral edge of the vane plate with the above ruled line of the drum body, by integrating by soldering or welding It is customary to manufacture.

[0004]

By the way, the wet gas meter is used as a reference device for various gas flow rate measuring devices and is required to have high measurement accuracy. For this reason, if the mounting position of the blade plate is slightly displaced, or if the blade plate is not joined to the drum body even a little, the measurement accuracy will deteriorate.
The value as a product is lost. Therefore, when the blade plate is soldered to the drum body, it is necessary to carefully perform it with a high degree of attachment accuracy, which causes a problem that the soldering work is difficult. Moreover, the soldering work requires a high level of skill, and in particular, due to the recent lack of craftsmen, it is extremely difficult to secure a sufficient number of workers with a high level of skill. Attaching work is so-called 3K
It is a profession that is not popular with young people, and successors are not cultivated. As long as soldering is adopted, there is no prospect of improvement in the future, and there is a long-awaited solution.

Therefore, in recent years, the use of resin for the wet gas meter drum has been studied, and it has been partially put into practical use.

In the conventional synthetic resin drum, a groove is formed on a belt-shaped synthetic resin plate made of hard vinyl chloride resin or the like by machining along a blade mounting position, and then the belt-shaped resin plate is heated to about 110 ° C. Annealing treatment is performed by immersing the resin plate in the oil, and then the ends of the resin plate are joined together with an adhesive or solvent to form a cylindrical drum body. Manufactured by bending at a predetermined position to form a vane plate, fitting the outer peripheral edge of the vane plate into the processing groove of the drum body, and joining and fitting the fitting part with an adhesive or solvent. Was.

According to this drum, the vane plate can be easily positioned simply by fitting the vane plate into the processing groove, and the vane plate can be easily fitted by pouring an adhesive or the like into the fitting portion. It can be joined and workability can be further improved.

However, in the above resin drum, in order to improve the accuracy of mounting the blade plate, the blade plate mounting groove of the drum body needs to be manufactured by a machine tool such as a machining center, which is expensive. When a machine tool is used, there is a problem that the processing cost becomes very high and the cost increases. Further, when the strip-shaped drum body forming plate is rolled into a cylindrical shape, the ends of the drum body forming plate must be joined accurately, which is a troublesome work.

Although the resin plate shrinks due to the annealing treatment, the amount of shrinkage varies depending on the material of the resin plate and various conditions at the time of molding, and even one resin plate may cause uneven shrinkage. When this deviation occurs, for example, the positional accuracy of the blade plate mounting groove decreases, and when the drum body forming plate is rolled and joined, the blade plate mounting groove cannot be aligned, or inside the drum body. There is a problem that the yield deteriorates despite the high cost, such as the blade plate not being correctly stored and being a defective product.

The present invention solves the above-mentioned problems of the prior art and enables even an inexperienced operator to easily and accurately assemble, thereby improving the yield and reducing the cost. An object of the present invention is to provide a wet gas meter drum and a method for manufacturing the wet gas meter drum that can obtain high measurement accuracy when used as an upper gas meter.

[0011]

In order to achieve the above object, a wet gas meter drum of the first invention of the present application is made of a seamless synthetic resin integrally molded product, and a plurality of wet gas meter drums are provided at predetermined positions on the inner peripheral surface. It consists of a cylindrical drum body with a groove for mounting the blades and a seamless synthetic resin integrally molded product, and has inlet and outlet blades extending in opposite directions on both sides of the partition plate. A plurality of vanes are provided, and the outline is formed by joining and integrating the outer peripheral edges of the vanes in the concave grooves of the drum body.

In the first aspect of the present invention, a mounting fitting portion that projects in the drum axial direction is provided continuously along the outer peripheral edge of the vane plate, and the mounting fitting portion is the concave portion. It is preferable to adopt a structure in which the members are joined and integrated in a state of being fitted in the groove.

In order to achieve the above object, a method for manufacturing a wet gas meter drum according to a second aspect of the present invention is a cylindrical drum body having a plurality of blade plate mounting grooves at predetermined positions on the inner peripheral surface. A step of obtaining a seamless synthetic resin integrally molded product, and a plurality of blade plates provided with an inlet blade portion and an outlet blade portion extending in opposite directions on both sides of the partition plate portion, The gist of the present invention is to include a step of obtaining an integrally molded product and a step of fitting the outer peripheral edges of the respective vane plates into the concave grooves of the drum body to join and integrate them.

The wet gas meter drum of the first invention of the present application comprises a drum body of a synthetic resin integrally molded product having a blade plate mounting groove formed on the inner peripheral surface thereof, and a blade plate of the synthetic resin integrated product. Therefore, the blade plate can be easily and accurately attached simply by fitting the outer peripheral edge of the blade plate into the concave groove of the drum body and joining and integrating them.

Further, since the drum body and the vane plate are formed of a three-dimensional resin-integrally molded product, internal stress is less likely to occur, harmful deformation can be prevented, and good dimensional stability can be obtained. it can.

In the first aspect of the present invention, a fitting portion for mounting which protrudes in the axial direction is provided continuously along the outer peripheral edge of the blade plate, and the fitting portion is fitted in the groove of the drum barrel. In the case of adopting a structure in which they are joined and integrated, a sufficiently large joining area can be secured between the blade plate and the drum body, and occurrence of joining defects can be reliably prevented. Further, by forming the fitting portion for mounting, the entire blade plate can be reinforced.

On the other hand, the second invention of the present application specifies one aspect of the drum manufacturing process of the first invention.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a wet gas meter drum of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 to 4, the wet gas meter drum of this embodiment is arranged in a cylindrical drum body (1) and inside the drum body (1) with circumferentially offset positions. It is provided with four blade plates (2) and a donut-shaped drum cover (3) provided at the open end on one end side of the drum body (1).

The drum body (1) is composed of a seamless integrally molded product made of hard vinyl chloride resin, and has a plurality of blade plate mounting grooves at its blade plate mounting positions (predetermined positions) on its inner peripheral surface. (11) is formed.

In the present embodiment, the drum barrel (1) is formed by vacuum forming by the vacuum forming apparatus shown in FIG. The device is provided with a male mold (50) that can be reduced in diameter to reduce the external dimensions. This male mold (50) has an outer shape corresponding to the inner shape of the drum barrel (1), and has a blade groove (1) for mounting the blade plate of the drum barrel (1) on the outer peripheral side surface.
The ridges (51) are formed at the positions where 1) is formed.

Then, a vinyl chloride resin plate (10a) softened by heating is placed on the male mold (50), and then, as shown in FIG.
As shown in FIG. 3, the softening resin plate (10a) is sucked from a suction hole (not shown) provided on the outer periphery of the male die (50) to be sucked onto the male die (50) to be molded.

Subsequently, after the resin is cured, the male mold (50) is reduced in diameter, and then the resin molded product (10) is taken out from the male mold (50) and provided with a drum body (1) as shown in FIG. A hat type resin molded product (10) is obtained. In the figure, the outline of the drum barrel (1) is shown by an imaginary line for reference.

Next, this resin molded product (10) is cut along the contour of the drum body (1) by cylindrical cutting or the like, and the result shown in FIG.
As shown in (1), the unnecessary portion (10b) is removed to obtain the drum body (1) having the above structure.

On the other hand, as shown in FIGS. 1 to 3, the blade plate (2) is made of a hard vinyl chloride resin and is a seamless integrally molded product.
2) and an inlet vane portion (23) and an outlet vane portion (24) that are connected to both ends of the partition plate portion (22) and extend in mutually opposite directions with a predetermined angle with respect to the partition plate portion (22). ing. Further, along the outer peripheral edge of the blade plate (2), a fitting portion (21) for attachment projecting in the drum axial direction is formed continuously.

This vane plate (2) is also formed by vacuum forming. That is, a vinyl chloride resin plate in a softened state is sucked and adsorbed by a molding die formed along one surface of the blade plate (2) to form a resin molding including the blade plate (2) as shown in FIG. Obtain the item (20).

Subsequently, this resin molded product (20) is cut along the contour of the blade plate (2) (imaginary line in FIG. 9) to obtain the resin shown in FIG.
As shown in 0, the unnecessary portion (20b) is removed to obtain the blade plate (2) having the above structure.

On the other hand, donut-shaped drum cover (3)
Is also formed by vacuum forming. That is, a vinyl chloride resin plate in a softened state is suction-adsorbed by a molding die formed following the shape of one surface of the drum cover (3), and a resin having the drum cover (3) as shown in FIG. A molded product (30) is obtained. Subsequently, the resin molded product (30) is cut along the contour (imaginary line in FIG. 11) to remove the unnecessary portion (30b) as shown in FIG. Thus, as shown in FIGS. 1 to 3, a through hole (32) is formed in the center and a ring-shaped fitting projection (31) is formed corresponding to the inner diameter of the drum body (10). Get the drum cover (3).

The drum body (1), the blade plate (2) and the drum cover (3) thus molded are assembled as follows.

First, as shown in FIG. 1, the blade plate (2) is arranged inside the drum body (1), and the mounting fitting portion (21) at the outer peripheral edge of the blade plate (2) is attached to the drum body (1). The blade plate is fitted into the concave groove (11) of (1) and an adhesive or a solvent is poured into the concave groove (11) to join and integrate the blade plate with the drum body (1). Similarly, the remaining three vane plates (2) are successively fitted into the respective concave grooves (11) of the drum body (1) to be joined and integrated. In addition, after fitting the four blades (2) into the concave grooves (11) of the drum body (1) and temporarily assembling, the four blades (2) are bonded with an adhesive or the like. They may be joined and integrated.

Next, as shown in FIG. 2, after attaching a synthetic resin drum washer (40) to the inlet blade portion (23) and the outlet blade portion (24) of the blade plate (2), as shown in FIG. As shown in FIG. 3, the drum cover (3) is attached to the fitting convex portion (3
1) is fitted to the inner circumference of one end side of the drum body (1), and the two are joined and integrated by an adhesive or solvent applied to the fitting portion.

As a result, a drum having four measuring chambers arranged in the circumferential direction, which is partitioned by the four blade plates (2) inside the drum body (1), is assembled.

In FIG. 2, (4) is a drum shaft fixed to the drum washer (40) and arranged along the drum axis.

According to this wet gas meter drum, since the concave groove (11) is formed along the blade plate mounting position on the inner peripheral surface of the drum body, the concave groove (11) is fitted into the outer peripheral surface of the blade plate for mounting. The blade plate (2) can be attached with high precision simply by fitting the parts (21) and joining and integrating them. Therefore,
Even an unskilled worker can easily and accurately assemble it. Moreover, since the blade plate (2) can be attached with high accuracy, high measurement accuracy can be obtained when this drum is used in a gas meter. Further, since the drum body (1) is three-dimensionally formed by vacuum forming, the laborious work of joining the end portions of the belt-shaped drum body forming plates to assemble them into a cylindrical shape as in the conventional case is omitted. Yes, it is easier to assemble. Further, since the blade plate (2) and the drum cover (3) are also three-dimensionally formed by vacuum forming, it is possible to omit troublesome bending work and the like as in the conventional case, and to further facilitate the assembling work. You can

Further, since the concave groove (11) of the drum body (1) is formed at the same time as the molding of the drum body (1), it is not necessary to separately provide a concave groove forming step, and the drum body manufacturing process is simplified. Can be achieved. Moreover, as in the past,
Since it is not formed by an expensive machine tool such as a machining center, the cost can be reduced.

Since the drum body (1) is a resin-integrally molded product, good dimensional stability can be obtained, and the groove (1
1) can always be formed with high positional accuracy. Therefore, the blade plate (2) can be reliably joined to the drum body (1), defective products can be prevented from occurring, and the yield can be improved and the cost can be further reduced.

Further, since the drum body (1), the blade plate (2) and the drum cover (3) are made of a three-dimensionally molded resin-integral product, a flat plate material may be bent as in the conventional case. As compared with the case of assembling into a three-dimensional shape while distorting, the generation of internal stress can be suppressed, so that harmful strain deformation can be prevented. Therefore, for example, the capacity of each measuring chamber in the drum can be kept constant for a long time, and high measurement accuracy can be maintained for a long time.

Further, since the mounting fitting portion (21) projecting in the drum axial direction is formed on the outer peripheral edge of the blade plate (2), the fitting portion (21) of the blade plate (2) is used. It is possible to reinforce and increase the rigidity of the entire drum. For this reason, harmful deformation can be prevented more reliably, and also in this respect, measurement accuracy can be improved.

Further, a fitting portion (21) for mounting the blade plate (2)
Is to be fitted into the concave groove (11) of the drum body (1) to be joined, so that a sufficiently large joining area can be secured, occurrence of joining failure can be reliably prevented, and assembly accuracy is further improved. And the yield can be improved.

On the inner surface side outer periphery of the drum cover (3),
Since the ring-shaped fitting convex portion (31) is formed corresponding to the inner diameter of the drum body (1), the convex strip portion (31) is formed.
The drum cover (3) can be easily attached only by fitting the drum cover (1) into the drum body (1) and adhering or welding the drum body (1). From this point as well, the drum assembly work can be easily performed.

In the above embodiment, the drum body (1), the blade plate (2) and the drum cover (3) are:
Although the one made of polyvinyl chloride resin is used, the present invention is not limited thereto, and the one made of other thermoplastic resin such as acrylic resin or polycarbonate resin can also be used.

However, the drum constituent members (1) and (2)
As the material of (3), it is desirable to use polyvinyl chloride resin, which can relatively easily join the members at the time of assembly with an adhesive or a solvent.

In the above embodiment, the drum constituent members (1), (2) and (3) are formed by vacuum forming, but in the present invention, pressure forming may be used together. Furthermore, in the present invention, it is not limited to vacuum forming and vacuum pressure forming, but may be formed by another forming method,
For example, it may be formed by injection molding. However, when injection molding is used, it is economically disadvantageous, for example, the cost of the mold becomes high. Therefore, it is preferable to use vacuum molding or vacuum pressure air molding, and more preferable to use vacuum molding.

[0044]

As described above, according to the wet gas meter drum of the first invention of the present application, the drum body of the synthetic resin integrally molded product in which the blade plate mounting groove is formed on the inner peripheral surface, and the synthetic resin integrated body Since the blade plate of the molded product is provided, the blade plate can be easily and accurately attached simply by fitting the outer peripheral edge of the blade plate into the concave groove of the drum body and joining and integrating them. Even an unskilled worker can easily and accurately assemble the product, improve the yield and reduce the cost, and obtain high measurement accuracy when used as a gas meter. Furthermore, since the drum body and the vane plate are formed of a three-dimensionally molded resin integrated product, internal stress is unlikely to occur, harmful deformation can be prevented, and good dimensional stability can be obtained. Therefore, for example, the concave groove of the drum body can always be obtained with good positional accuracy, the blade plate can be securely attached to the drum body, and defective products can be prevented from occurring.
The advantages are that yield can be improved, cost can be reduced, and measurement accuracy can be improved.

In the first aspect of the present invention, the fitting portion for mounting which projects in the axial direction is provided continuously along the outer peripheral edge of the blade plate, and the fitting portion is fitted in the concave groove of the drum body. In the case of adopting a structure in which the blades and the drum body are joined and integrated, it is possible to secure a sufficiently large joining area between the vane plate and the drum body, reliably prevent occurrence of joining defects, and further improve the yield. Furthermore, since the entire blade plate is reinforced by forming the fitting portion for mounting, in this respect also, there is an advantage that harmful deformation can be prevented and the measurement accuracy can be further improved.

Since the second invention of the present application specifies one aspect of the manufacturing process of the drum, the drum manufactured by the drum can obtain the same effect as the above.

[Brief description of drawings]

FIG. 1 is a perspective view showing a wet gas meter drum according to an embodiment of the present invention with vane plates separated.

FIG. 2 is a perspective view showing a state where a drum cover is separated in the drum of the embodiment.

FIG. 3 is a perspective view showing a side sectional view of the drum of the embodiment.

FIG. 4 is a development view of a drum body of the drum of the embodiment.

FIG. 5 is a schematic side sectional view showing a state during molding in the drum barrel molding apparatus used in the embodiment.

FIG. 6 is a schematic side sectional view showing a state immediately after completion of molding in the drum body molding apparatus of the embodiment.

FIG. 7 is a perspective view showing a molded product for producing a drum body in the embodiment.

FIG. 8 is a perspective view showing a molded product for producing a drum body in the embodiment, which is separated at a predetermined position.

FIG. 9 is a perspective view showing a molded product for producing a blade plate in the embodiment.

FIG. 10 is a perspective view showing a molded product for producing a blade plate according to the embodiment in a state of being cut off at a predetermined position.

FIG. 11 is a perspective view showing a molded product for producing a drum cover in the embodiment.

FIG. 12 is a perspective view showing a molded product for producing a drum cover in the embodiment, which is cut off at a predetermined position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drum body 2 ... Vane plate 11 ... Vane plate mounting concave groove 21 ... Mounting fitting part 22 ... Partition plate part 23 ... Inlet blade part 24 ... Exit blade part

Claims (3)

[Claims] 1. A cylindrical drum body made of an integrally molded product of seamless synthetic resin, having a plurality of blade plate mounting grooves at predetermined positions on the inner peripheral surface, and a seamless synthetic resin. And a plurality of blade plates provided with an inlet blade portion and an outlet blade portion extending in mutually opposite directions on both sides of the partition plate portion, each blade in each concave groove of the drum body. A wet gas meter drum, wherein the outer peripheral edges of the plates are joined and integrated in a fitted state. 2. A mounting fitting portion projecting in the drum axial direction is provided continuously along the outer peripheral edge of the vane plate, and the mounting fitting portion is fitted in the concave groove. The wet gas meter drum according to claim 1, wherein the wet gas meter drum is integrally joined in a closed state. 3. A step of obtaining a cylindrical drum body having a plurality of blade plate mounting grooves at predetermined positions on the inner peripheral surface as a seamless synthetic resin integrally molded product, and a partition plate portion. A plurality of vane plates provided with inlet vane portions and outlet vane portions extending in opposite directions on both sides of the drum as a seamless synthetic resin integrally molded product; A method for manufacturing a wet gas meter drum, which comprises a step of fitting outer peripheral edges of respective blades to join and integrate them.