JPS6118405Y2 - - Google Patents

Description

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

Recently, a rotary piston type flowmeter 1 shown in FIGS. 1 and 2 has been considered in order to accurately measure the flow rate of a slurry liquid containing particulate foreign matter in the liquid to be measured. This rotary piston type flowmeter 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. Furthermore, an annular partition wall 8 and a measuring chamber 7
The gap between the inner wall of the lower body 3 and the partition plate 11 that forms the
At the same time, the gap between the upper annular partition wall 9 and the inner wall is also blocked by the partition plate 11. Further, the measuring chamber 7 has an inlet 4 side and an outlet 5 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 which moves to interrupt direct communication with the side. The rotor 12 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
A bearing 16 for the rotor shaft 15 of the rotor 12 is attached to 4, and this bearing 16 supports the rotor shaft 15 of the rotor 12, and the distance between the rotor shaft 15 and the central axis 13 is maintained constant. It is composed of

The rotary piston type flow meter confines the liquid to be measured in the measuring chamber 7 by the rotor 12 and the partition plate 11 and performs measurement. At this time, the inner surface of the measuring chamber 7 and the rotor 1
The smaller the gap created between the outer surface of 2 and the outer surface of 2, the better the measurement accuracy will be. Therefore, depending on the viscosity of the liquid to be measured, the center shaft 13 is designed to maintain a wide gap between the inner surface of the measuring chamber 7 and the outer surface of the rotor 12 to the extent that measurement accuracy is not impaired.
The distance between the rotor shaft 15 and the rotor shaft 15 is kept constant. Therefore, within the width of this gap, the rotor 12 continues to move smoothly regardless of the particles. However, if the granules are larger than the width of the gap, the rotor 12 will be blocked by the granules due to the limited distance between the central axis 13 and the rotor shaft 15. The particulate matter is carried not only to the vicinity of the partition attachment part of the inner wall of the lower body 3 but also to the vicinity of the partition attachment part of the annular partition wall 8, where it remains. Therefore, the rotor 12 removes the particles from the partition plate 1.
1 and the inner wall of the lower body 3 or the annular partition wall 8, the rotor 12 does not move and stops, resulting in disadvantages such as the inability to measure the liquid to be measured.

The present invention aims to eliminate the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings. In FIGS. 3 and 4, 3 is a lower main body, and a central shaft 13 is fixed to the center of the annular partition wall 8 of the lower main body 3 that forms the measuring chamber 7, and an eccentric bearing is mounted on this central shaft 13. A stand 14 is rotatably mounted. This eccentric bearing stand 14 is divided into two parts: a part 21 with a hole 19 that fits into the center shaft 13 in the annular partition 8, and a part 22 with a hole in the rotor shaft 15 of the rotor 12,
A spring 17 is elastically interposed between them.
These portions 21 and 22 are held so that the center axis 13 and the rotor axis 15 are normally kept constant by a ring 18 wound around the outer periphery, and the center axis 13 and the rotor axis 15 are held constant by the spring 17 and the ring 18. The structure allows the distance to be varied.

When measuring a liquid to be measured using a rotary piston type flowmeter equipped with the eccentric bearing stand 14 having the structure described above, if large particles are caught,
The spring 17 in the eccentric bearing stand 14 is compressed, and the distance between the center shaft 13 and the rotor shaft 15 is shortened, so that the gap between the inner surface of the metering chamber 7 and the outer surface of the rotor 12 is increased. The rotor 12 climbs over the granules and sends the granules to the outlet 5.
Push it to the side. Therefore, the granules are transferred to the rotor 12,
There is no jamming between the inner wall of the metering 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 17 in the eccentric bearing stand 14 is restored, and the hole 19 that fits into the central shaft 13 in the annular partition 8 and the hole 20 in the rotor shaft 15 of the rotor 12 are preset by the ring 18. By returning to its normal position, the rotor 12 returns to its normal position and continues to move smoothly.

As explained above, the present invention presets the normal distance between the hole that fits into the center shaft in the annular bulkhead and the hole in the rotor shaft of the rotor using a ring that holds the outer periphery of the divided eccentric bearing stand. When particulate matter enters the measuring chamber, the rotor moves against the spring interposed between the divided parts, and the structure is such that the rotor instantly overcomes the particulate matter and drains the particulate matter out. This eliminates the problem of rotor operation stopping due to particles getting caught in the measuring chamber, and also eliminates the need to adjust the gap between the inner wall of the measuring chamber and the rotor surface depending on the viscosity of the liquid being measured. , it has advantages such as simplifying the assembly process.
Furthermore, damage to the rotor, rotor shaft, and other parts due to rotor jamming is drastically reduced. Furthermore, when the rotor overcomes this particulate matter, the rotor shaft instantly returns to the normal position set in advance by the ring, which has the advantage of allowing stable flow measurement to continue without any change in measurement accuracy.

[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 taken along line A-A in Fig. The figure is a cross-sectional view of the main part taken along the line B--B in FIG. 3. 1 is a rotary piston type flowmeter, 2 is an upper body, 3 is a lower body, 4 is an inlet, 5 is an outlet, 6
1 is a display section, 7 is a measuring chamber, 8 is an annular partition wall, 9 is an upper annular partition wall, 10 is an upper lid, 11 is a partition plate, 12 is a rotor, 13 is a central shaft, 14 is an eccentric bearing stand, 15 is a rotor shaft, 16 1 is a bearing, 17 is a spring, 18 is a ring, 19 is a hole that fits into the center shaft, 20 is a hole in the rotor shaft, 21 is a part with a hole that fits into the center shaft, 2
2 is the hole in the rotor shaft.

Claims (1)

[Claims for Utility Model Registration] An annular partition wall 8 is arranged concentrically in the center of the measuring chamber 7, and a gap between the inner wall forming the measuring chamber 7 and the annular partition wall 8 is blocked by a partition plate 11, and the flow A rotor 12 that moves within the metering chamber 7 is arranged in contact with the annular partition wall 8 and the inner wall so as to block direct communication between the inlet 4 side and the outlet port 5 side, and the central shaft 13 is further fixed within the annular partition wall 8. The rotor 1 is attached to this central axis 13.
In a rotary piston type flowmeter in which an eccentric bearing stand 14 supporting a rotor shaft 15 of No. 2 is rotatably attached, the hole 1 which fits into the central shaft 13 in the annular partition wall 8
The eccentric bearing stand 14 is divided into a part 21 where the hole 20 of the rotor shaft 15 is located and a part 22 where the hole 20 of the rotor shaft 15 is located, and a spring 17 is interposed between the divided parts 21 and 22. The parts 21 and 22 are held by the ring 18, and the central shaft 13 and the rotor shaft 15 are held together by the ring 18.
A rotary piston type flow meter characterized by a structure that allows the distance between the rotary piston and the