JPS634973Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rotary piston type flowmeter.

Recently, in order to accurately measure the flow rate of slurry liquid containing particulate foreign matter in the liquid to be measured,
The rotary piston type flowmeter shown in the figure has been developed. This rotary piston type flowmeter 1 consists of an upper body 2 and a lower body 3, and the upper body 2 has an inlet 4 and an outlet 5. Further, a display section 6 is attached above the upper main body 2. On the other hand, the lower main body 3 has a measuring chamber 7.
An annular partition wall 8 is provided concentrically at the center of the wall. Further, above the measuring chamber 7, an upper lid 10 having an upper annular partition 9 at a position facing the annular partition 8 is arranged. Further, a gap between the annular partition wall 8 and the inner wall of the lower body 3 forming the metering chamber 7 is blocked by a partition plate 11, and a gap between the upper annular partition wall 9 and the inner wall is also blocked by the partition plate 11.
Further, the metering chamber 7 is provided with an inlet 4 side and an outlet 5 side, which are sandwiched between an annular partition wall 8 and an upper annular partition wall 9, and are always in contact with the inner wall of the lower body 3, the annular partition wall 8, and the upper annular partition wall 9. A rotor 12 is arranged to move so as to interrupt direct communication with the motor. This rotor 1
2 has a cylindrical shape with a bottom in the middle.

A central shaft 13 is fixed at the center of the annular partition wall 8, and an eccentric bearing stand 14 is rotatably attached to the central shaft 13. This eccentric bearing stand 1
4 has an oblong hole 15 extending in the radial direction,
Inside this oval hole 15, the rotor shaft 16 of the rotor 12
is urged outwardly by a spring 18 via a bearing 17, and the rotor shaft 16 is configured to be slidable in the longitudinal direction within the oblong hole 15.

When the rotary piston type flowmeter starts measuring the liquid to be measured, when the rotor 12 moves in contact with the inner wall of the lower body 3 and the annular partition wall 8 or the upper annular partition wall 9, particulate matter is caught at the contact position. However, when the rotor 12 passes over this granular material, the rotor shaft 16 slides within the oblong hole 15 against the spring 18. Therefore, the rotor 12 continues to move smoothly regardless of the particles. However, if the granules become large, the rotor 12 will not be able to overcome the granules because the amount of deformation of the spring 18 is limited, and the granules will not reach the area where the partition plate is attached to the inner wall of the lower body 3. Of course, it is also carried to the vicinity of the partition attachment part of the annular partition 8 and stopped there. Therefore, the rotor 12 gets caught between the particulate matter and the inner wall of the partition plate 11 and the lower main body 3 or the annular partition wall 8, and the rotor 12 does not move and stops, causing disadvantages such as making it impossible to measure the liquid to be measured. There is.

The purpose of this invention is to eliminate the above drawbacks.
Examples will be described below with reference to the drawings. In FIG. 3, 3 is a lower body, and first notches 19, 19 are bored in the inner wall of the lower body 3 forming the measuring chamber 7 at positions on both sides of the partition plate 11 and close to the partition mounting part. It is set up. The size of the first notches 19, 19 is made sufficiently larger than the largest particulate matter that is expected to be mixed in, and the first notches 19, 19 are
The defects 9 and 19 in the inner wall are configured to a size that does not interfere with the smooth movement of the rotor 12.
Further, in the annular partition wall 8, second notches 20, 20 are bored on both sides of the partition plate 11 and at positions close to the partition plate 11, similar to the first notches 19. moreover,
Similar to the first notch 19, the defect in the inner wall caused by the second notch 20 is configured to a size that does not interfere with the smooth movement of the rotor 12.

When measuring the liquid to be measured using the rotary piston type flowmeter configured as above, the eccentric bearing stand 1
In the case of a particle whose diameter is smaller than the amount of deformation of the spring 18 in the spring 4, the rotor 12 smoothly overcomes the particle and the rotor 12 continues to move. If the particulate matter has a diameter larger than the amount of deformation of the spring 18, the spring 18 will be compressed to the limit, causing the rotor 12 to eccentrically move, and the rotor 12 will move the particulate matter to the outlet. Push it to the 5th side,
Eventually, the particulate matter reaches the inner wall or the vicinity of the partition attachment part of the annular partition wall 8 and remains at this position. When the granules reach this position, the granules are in the first notch 1
9 or the second notch 20 . Therefore, particles do not get caught between the rotor 12, the inner wall of the measuring chamber 7, and the partition plate 11, as well as between the rotor 12, the annular partition wall 8, and the partition plate 11. At the same time, the compressed spring 18 is restored, the rotor 12 returns to its normal position, and the rotor 12 continues to move smoothly.

Although the second notch 20 has been explained only in the annular partition wall 8, the second notch 20 is provided in the upper annular partition wall 9.
A similar effect can be obtained by drilling a similar notch. Further, as shown in FIG. 4, even if the annular partition wall 8 is scraped off by the flat part 21 and the second cutout part 20 is bored, the same effect is not only brought about, but also the second cutout part 20 is extremely easy to drill. It also has the advantage of being inexpensive. Furthermore, in the embodiment, the notches are bored in the inner wall of the measuring chamber 7 and the annular partition wall 9 at the same time, but it is possible to make the notches in only one of the inner wall of the measuring chamber 7 and the annular partition wall 9. A similar effect can be achieved.

As explained above, the present invention is configured to accommodate the particulate matter by drilling a notch in the position where the particulate matter is caught, so that the particulate matter is caught in the measuring chamber and the movement of the rotor is prevented. Not only is there no trouble such as stopping, the rotor moves smoothly, and there are advantages such as pulsating current, vibration, and the noise caused by these can be significantly reduced. There is also the advantage of drastically reducing damage to the rotor, rotor shaft, and other parts due to rotor jamming.

[Brief explanation of the drawing]

Fig. 1 is a cutaway sectional view of the main part showing a conventional example, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, Fig. 3 is an enlarged sectional view of the main part of the present invention, and Fig. 4 is an enlarged sectional view of the main part of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Rotary piston type flow meter, 2...Upper body, 3...Lower body, 4...Inflow port, 5...Outlet port, 6...Display section, 7...Measuring chamber, 8...Annular partition wall , 9... Upper annular partition wall, 10... Upper lid, 11
...Diameter, 12...Rotor, 13...Central shaft, 1
4...Eccentric bearing stand, 15...Oval hole, 16...Rotor shaft, 17...Bearing, 18...Spring, 19...
...first notch, 20...second notch, 21...flat part.

Claims (1)

[Claims for Utility Model Registration] An annular partition 8 is arranged concentrically in the center of the measuring chamber 7, and a gap between the annular partition 8 and the inner wall forming the measuring chamber 7 is blocked by a partition plate 11. 8 and the inner wall, and the inlet 4 side and the outlet 5
The rotor 12 moves so as to cut off direct communication with the side.
A rotary piston type flowmeter in which the rotor shaft 16 of the rotor 12 is biased by a spring 18 so as to move integrally with the eccentric bearing pedestal 14 rotatably arranged within the annular partition wall 8, A notch is bored in at least one of the inner wall of the rotor 12 at a position close to the partition mounting part and the annular partition 8 at a position close to the partition mounting part, and the damage in the inner wall due to the cutout is removed. A rotary piston type flow meter characterized by its size that does not hinder movement.