JPH061207B2 - Orifice type area flow meter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an orifice type area flow meter for measuring a flow rate of a fluid.

(Conventional Invention) In the conventional area flow meter, since the taper tube is made of glass, a uniform product is impossible. Furthermore, since the flow paths are not evenly formed, the scale plate of each flow meter must be manufactured through the reference flow meter under the measurement conditions.
Since a common scale plate is used, there is a drawback that many variations occur in accuracy.

Further, as a molded plastic flow meter, Japanese Utility Model Publication No. 51-5332 is known. However, on the whole, it cannot be considered that the simplification was made and the number of parts decreased as the left side. In particular, there is no orifice type area flow meter made of plastic.

(Problems to be solved) As an orifice type area flow meter, for example,
Although Japanese Patent Laid-Open No. 116250 has been known, it has a drawback that it requires several tens of parts for assembling, inevitably increasing the manufacturing cost, and consequently increasing the product cost. It is an object of the present invention to provide a high-performance orifice type area flow meter at a low cost, with the number of parts being extremely reduced.

(Means for Solving Problems) Tapered pipe 8 having upper opening 6 communicating with introduction pipe 4 provided in mounting plate 3, through hole 9 of upper opening 6 and discharge pipe provided in mounting plate 3. A closure having a transparent plastic body 12 integrally molded with a return pipe 11 that communicates with 10, a float 13 installed in the tapered pipe 8, and a small hole 14 inserted into the upper opening 6. An orifice type area flow meter characterized by being provided with 15 and solving the above-mentioned problems.

(Operation) In FIG. 1 and FIG. 2, when the pressure fluid flows into the introduction pipe 4 from the primary side of the orifice 2 of the main pipe 1, the float 13 in the taper pipe 8 is pushed up according to the flow rate, and the closure 15 Small hole 1
4 through the return pipe 11 and discharged from the discharge pipe 10. Therefore, the flow rate of the main pipe 1 can be measured from the height of the float 13 that indicates the bypass flow rate.

In the present invention, since the taper pipe 8 and the flow path are all made of uniform plastic parts, if the scale plate 7 of the flowmeter under the measurement conditions is manufactured through the reference flowmeter, it is almost the same as the reference flowmeter. Common scale plate 7 with the same accuracy
It is possible to mass-produce the orifice type area flow meter having.

Further, since the shape of the taper pipe 8 can be set arbitrarily, not only the scale plates 7 with equal intervals but also the other target plates 7 can be arbitrarily manufactured.

With the configuration shown in FIG. 3, normally, the stop of operation is performed by specially providing a stop valve in the joint pipe, but it can be easily performed by also using the closing member 15. Further, the strainer 21 can also remove dust contained in the fluid.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The primary passage of the orifice 2 provided in the main pipe 1 communicates with the introduction pipe 4 provided in the mounting plate 3. Reference numeral 5 is a bolt hole for mounting the mounting plate 3. A taper pipe 8 with a graduation 7 having an upper opening 6 that rises vertically to the surface of the mounting plate 3 at the end of the introduction pipe 4, a through hole 9 in the upper opening 6, and the mounting plate 3.
A transparent plastic main body 12 is integrally formed with a return pipe 11 that connects the discharge pipe 10 provided in the above. The discharge pipe 10 communicates with the secondary side flow path.

The float 13 is housed in the taper pipe 8 through the upper opening 6, and a closure 15 having a small hole 14 is inserted into and bonded to the upper opening 6. A stopper 16 for the float 13 is formed on the lower portion of the closure 15.

A second embodiment will be described with reference to FIG. This is the case where the rotatable opening 15 having the small hole 14 is attached to the upper opening 6 in the first embodiment. FIG. 4 is a perspective view of the closure 15. 16 is a stopper, 17 is a slip line, 18 is a snap ring, and 19 is an O-ring.

Further, the strainer 21 is mounted between the lower introduction pipe 4 and the taper pipe 8. 22 is cap, 23 is O
It's a ring.

(Effects of the Invention) As described above, according to the present invention, the float 13 is installed in the integrally molded transparent plastic body, and the number of components is reduced to a fraction of the conventional one, and the assembly can be completed in only a few minutes. Completed,
A highly accurate orifice type area flow meter with extremely reduced product cost can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a vertical sectional view of a second embodiment, and FIG. 4 is a perspective view of its closure. 1 ・ ・ Main pipe, 2 is orifice, 3 ・ ・ Mounting plate, 4 ・ ・ Introduction pipe, 6 ・ ・ Upper opening 8 ・ ・ Tapered pipe, 9 ・ ・ Through hole, 10 ・ ・ Discharge pipe 11 ・ ・ Return pipe, 12 ... Molded plastic body, 13 ... Float, 14 ... Small hole, 15
..Closers, 20..lower openings, 21..strainers,
22 ... Cap.

Claims (1)

[Claims] 1. A taper pipe (8) having an upper opening (6) communicating with an introduction pipe (4) provided on a mounting plate (3), and a through hole (9) of the upper opening (6), A transparent plastic body (12) integrally molded with a return pipe (11) that communicates with a discharge pipe (10) provided on a mounting plate (3), and a float ( 13) and
An orifice type area flow meter, characterized in that it is provided with a closure (15) having a small hole (14) to be fitted into the upper opening (6).