JPS5919812A - Method and apparatus for manufacturing area type flow meter by double layer structure - Google Patents

Abstract

PURPOSE:To obtain an optional function relation between a position of a float and a flow rate, and to make linearity of a flow meter more complete, by working an inside cylinder adhering closely to the inside wall of an outside cylinder so that its sectional area is varied in the vertical direction, installing it into the outside cylinder and using it as a pipe part of a detecting part of an area type flow meter. CONSTITUTION:A pipe part of a detecting part of an area type flow meter is formed by fitting a pipe part inside layer 2 of the detecting part worked by inscribing it to a pipe part outside layer 1 of the detecting part. Subsequently, a float 3 is inserted, an inside layer protecting ring 4 used as a float 3 stopper, and packing 5 are inserted, and the inside layer is fixed to the outside layer by a clamping screw 6. Packing 7 and a connecting union 8 are used for connection to a pipe. Hatching is performed to a face exposed to the inside of the outside layer and the inside layer, and a section of a flow path formed by the float 3, and it is utilized that some area is varied by a position (h) of the float 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing an area flowmeter with a two-layer structure.

In the past, for fluids used in small quantities, it was not possible to obtain a flow meter at an appropriate price, and because there was no flowmeter, strict measurement management was not performed, and extremely large-scale management was performed using needle degrees and current-limiting orifices. f″1. was the best I could do.

However, as the demand for resource and energy conservation has become more demanding in recent years, more detailed management of fluid consumption for these purposes has become desirable, and inexpensive flowmeters have become more and more desirable. Realization 75: The trend is strongly encouraging.

Generally, a Z pipe is used as the pipe part of the detection part of an area flowmeter, and products using a Z pipe are widely available on the market, but the production of Z pipes generally requires cutting. It is done by molding, and not only is the cutting cost of the taber processing high, but even in the case of molding, cost reduction can only be expected when manufacturing large quantities of the same specifications, and it is difficult to meet the diverse demands of the market. A method and apparatus for manufacturing a low-cost area flow meter has not yet been realized. 1. According to the present invention, changes in the cross-sectional area of the tube part of the detection part of an area type flowmeter can be extremely easily changed by processing the inner layer of a two-layered tube, such as making a V-shaped cut in the tube used for the inner layer, instead of using a tapered tube. The required tube section can be obtained.

In one aspect of the present invention, a tube with a uniform cross section is vertically erected as an outer cylinder, and an inner cylinder that closely contacts the inner wall is processed so that its cross-sectional area changes in the vertical direction. Another invention is an invention of a method for manufacturing an area flowmeter with a two-layer structure, characterized in that the area flowmeter is installed in a pipe and used as a pipe part of a detection part of an area flowmeter. This invention is a device that can be used directly in practice, and this device forms the tube of the detection section of an area flowmeter by attaching the inner layer of the tube of the detection section to the outer layer of the tube of the detection section. Next, insert the float, insert the protection ring for the inner layer of the tube of the detection section, which also serves as a float stopper, and the backing, and fix the inner layer of the tube of the detection section to the outer layer of the tube of the detection section with tightening screws. An area type flowmeter device with a two-layer structure, characterized in that it is equipped with a backing used for connection to piping and a connection union.

Next, embodiments of the present invention will be described with reference to the drawings.

Embodiment In FIGS. 1 and 2, the outer layer of the tube of the detection section (hereinafter referred to as "
It is called outer layer 1. ] (The inner layer of the tube of the detection part (hereinafter referred to as [inner layer-1)] is inscribed in the tube and processed as shown in Fig. 3.
2) forms the pipe section of the detection section of the area flowmeter.

Next, load the float (3), insert the inner layer protection ring (4) that also serves as a stopper for the float (3), and the backing (5), and fix the inner layer to the outer layer with the tightening screws (6). .The backing (A) and the connection union (8) are used for connection to piping.

In the cross-sectional view of Figure 4, the cross section of the flow path formed by the float (5) and the exposed inner layer of the outer layer and the inner layer is hatched, but this area changes depending on the position of the float (3). The gist of the present invention is to utilize.

In the prototype, the inner layer was cut into a figure-7 shape by two planes symmetrical about the axis for ease of processing. The inner diameter of the outer layer of the flow path in the range indicated by H in Fig. 4 is 2R, the inner diameter of the inner layer is 2r, and the height from the origin of the V-shaped notch to the maximum scale is H9, which is also the height up to the float (3). 11If the horizontal distance of the V-shaped cut cloth from the center of the float (3) is Express it using the following formula.

Ru.

f=R2[yt-2cos-' (αZ juice 2αz F]
7+ 2α2cos-'Z-2α2z "The Fuco prototype has an outer diameter of 18 mm and an inner diameter of 10 mm.

A colorless and transparent acrylic resin cylinder with an outer diameter of 10 mm and an inner diameter of 5 mm was used as the inner layer, H = 50 mm, and the float (3) was a nylon ball the size of a commercially available steel ball for ball bearings, and the value of d was ke4.76mm
(nominal diameter 3/16") and 3.97 mm (nominal diameter 5/32).

In this prototype, α=0.5, but d=4.761
The pattern of change in the cross-sectional area of the flow path in the case of mm is as shown in Table 1 and FIG.

The results of testing this prototype using instrument dry air are shown in Table 2, and the relationship between flow path cross-sectional area and flow rate is shown in Table 6.
The result is as shown in the figure.

, 12 Table 2 The present invention can be applied to any fluid and any flow rate; by changing the shape of the cut in the inner layer, an arbitrary functional relationship can be obtained between the position of the float (6) and the flow rate. Therefore, it can be expected to have other applications as well, such as making the linearity of area flowmeters closer to perfection.

[Brief explanation of the drawing]

The drawings show an embodiment of the device of the present invention; FIG. 1 is a partially vertical side view of the device of the present invention, FIG. 2 is a conceptual diagram of the assembly of the device of the present invention, and FIG. 3 is a perspective view of the inner layer. , Fig. 4 is an analysis diagram of the inner layer, Fig. 5 is a cross-sectional view taken along line A-A in Fig. 4, and Fig. 6 is a sample of the prototype with R = 5 mm and r = 2.5 mm.
, (]-= 4.76 mm float (
Figure 7 shows the relationship between the position of 3) and the cross-sectional area of the flow path at the position of the float (5). Ball (b)
Float (6) when dry air for instrumentation is flowed using
It shows the relationship between the position and the air flow rate. Figure 1 Figure 5 I Figure 4 Figure 3 Float toy standing [mm, 1 Figure 6 Hand 1 reading correction form (voluntary correction) 1972 October 1989 JPO Commissioner Wakasugi Oro 1, Case Indication Japanese Patent Application No. 57-128349 2, Name of Invention Method and Apparatus for Manufacturing Area Type Flow Meter with Two-Layered Structure 3;
Relationship with the person making the amendment case! Patent applicant address: No. 5, 6-2, Kasumigaseki, Chiyoda-ku, Tokyo
Name Osaka Petrochemical Co., Ltd. Representative Yuichi Kasama 4, Agent 7 Subject of amendment “Column for detailed explanation of the invention in the specification” 8 Contents of amendment (1) Page 6, line 6 of the specification The description ``A two-layer, 11-layered Menhama-style Ryukei device.'' indicates a Menhama-style Ryukei device with a two-layer structure. ” he corrected. (2) In the first line of page 5 of the specification, the statement ``Notching...' on the cross section'' is corrected to ``Soching...on the cross section in Figure 5.'' (3) Page 6 of the specification) The description in line 5 of "Figure 5" 7 is amended to read "Figure 6." (4) The statement "Figure 6" on page 6, line 8 of the specification is amended to read "Figure 7." (5) Table 1 on page 6 of the specification is amended as follows. ” (6) Clear ff (11t y a) Change the description “Float (3) position and air” to “Float (3) position and air” in the 9th line of page a.
) and the flow path cross-sectional area and air at the position.

Claims (2)

[Claims] (1) A pipe with a uniform cross section is stood vertically as an outer cylinder, and an inner cylinder that fits tightly against the inner wall is machined so that its cross-sectional area changes vertically, and installed inside the outer cylinder. 1. A method for manufacturing an area flowmeter with a two-layer structure, characterized in that the tube is used as a tube part of a detection part of an area flowmeter. (2) Form the tube of the detection section of the area flowmeter by attaching the inner layer of the tube of the detection section inscribed in the outer layer of the tube of the detection section, then insert the float and set the float stopper. Insert the protection ring and backing for the inner layer of the tube of the detection section, which also serves as a protection ring, and fix the inner layer of the tube of the detection section to the outer layer of the detection section with tightening screws. An area type flowmeter device with a two-layer structure, which is characterized by the fact that it is attached.