JPS5836022Y2 - Rotary piston type flowmeter - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a rotary piston type flow meter.

Conventionally, a rotary piston type flowmeter consists of a main body 1, a measuring box 2, and a display section 3, as shown in FIG. It is configured to

The main body 1 has an inlet 4 and an outlet 5, while the weighing box 2 has a measuring chamber 6 inside, and an inner lid 7 is bolted from above the measuring chamber 6 to shut off the measuring chamber 6 and the outside of the measuring chamber. 8 has been concluded.

Further, an annular partition wall 9 is concentrically formed in the center of the measuring chamber 6, and the outer peripheral surface of the measuring chamber 6 is in contact with the inner wall of the measuring box 2 and the outer wall of the annular partition wall 9, and the bottom part is in contact with the inner lid 7. A cylindrical rotor 10 with a bottom is disposed in contact with the rotor 10 so as to constantly move so as to interrupt direct communication between the inlet 4 and the outlet 5.

On the other hand, a central shaft 11 is fixed to the center of the bottom of the weighing box within the annular partition wall 9, and an eccentric bearing stand 1 is fixed to this central shaft 11.
2 is rotatably attached.

A rotor shaft 13 of the rotor 10 is rotatably fixed to a predetermined position of the eccentric bearing stand 12.

In this rotary piston type flowmeter, if large granular foreign objects or granular objects are mixed into the liquid to be measured, the space between the lower circumferential surface 14 of the rotor 10 and the bottom surface of the measuring box, or If particles become trapped between the outer peripheral surface of the rotor 10 and the inner wall of the weighing box 2, the rotation of the rotor 10 may stop, or
Furthermore, when the granular material is crushed by the rotor 10 and the weighing box 2, the rotor 10 may crack, and the inner walls of the rotor 10 and the weighing box 2 may be subject to extreme wear, resulting in a lack of durability of the device. It is occurring.

The present invention aims to eliminate the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings.

In FIGS. 2 and 3, 22 is a measuring box of a rotary piston type flowmeter, which has a measuring chamber 26 inside and an annular partition wall 29 concentrically in the center thereof.

A central shaft 31 is located at the center of the bottom of the weighing box within this annular partition wall 29.
is installed, and an eccentric bearing stand 32 is rotatably attached to this.

An oblong hole 35 extending in the radial direction is bored in the eccentric bearing stand 32, and the rotor shaft 33 of the rotor 30 is inserted into the bearing 3.
6, the rotor shaft 33 is elastically biased outward from the central shaft 31 by a first spring 37.
5 is configured to be slidable in the longitudinal direction.

Although a compression spring is used as the first spring 37, the same effect can be obtained even if the eccentric bearing stand 32 is changed to use a tension spring.

On the other hand, from above the weighing box 22, the inner cover 27 can be seen by the bolts 28.
The inner cover 27 is elastically biased and locked so that it can rise via a second spring 39, and the inner cover 27 is in contact with the upper bottom of the rotor 30 to isolate the measuring chamber 26 from the outside of the measuring chamber. It is composed of

Further, the inner lid 27 has a through hole 40 in the center thereof, and is configured so that the rotation of the rotor shaft 33 is taken out of the weighing box.

In the rotary piston type flowmeter, when measurement of the liquid to be measured is started, the rotor 30 rotates while contacting the bottom of the measuring box 22, the inner wall of the measuring box 22, and the outer wall of the annular partition wall 29.

If particulate matter is mixed in the liquid to be measured, this particulate matter may become trapped between the lower peripheral surface 34 of the rotor 30 and the bottom of the measuring box 22, but the rotor 30 is not pushed up by the particulate matter. Push up the inner lid 27 against the second spring 39 by
It overcomes the granules and continues to rotate.

Thereafter, the inner lid 27 is brought into close contact with the measuring box 22 by the elastic force of the second spring 39, and the normal measuring state is restored.

Furthermore, if particulate matter is caught between the outer circumferential surface of the rotor 30 and the inner wall of the weighing box 22, the rotor shaft 33 is moved in the first direction toward the center of the eccentric bearing stand 32 according to the size of the particulate matter. The rotor 30 slides inside the oblong hole 35 against the force of the spring 37, and continues to rotate over the granules.

Thereafter, the rotor shaft 33 returns to its original position within the oblong hole 35 due to the elastic force of the first spring 37, returning to the normal measurement state.

As explained above, the present invention elastically biases and locks the rotor shaft so that it can slide within the eccentric bearing stand, while elastically biasing the inner lid of the weighing box so that it can rise relative to the weighing box. Because it is configured to lock, even if particulate matter is mixed in the liquid being measured, the rotor may stop rotating, be damaged, or cause extreme wear on the rotor and the inner wall of the measuring box. This has the advantage that it is possible to perform continuous measurement without any trouble, and it is possible to provide a flowmeter with good durability.

In addition, when the liquid being measured is at high pressure, opening and closing the valve rapidly will cause a sudden change in flow rate, but even if the rotor starts or stops rotating, the sudden change in flow rate will cause the rotor to experience a sudden change in flow rate. The force is buffered by the spring, which has the advantage of not causing damage to the rotor or excessive wear.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional example with main parts cut away, FIG. 2 is a sectional view of main parts of the present invention, and FIG. 3 is a sectional view taken along the line A--A in FIG. 1.21...Main body, 2,22...Measuring box, 3...Display section, 4,24...Inflow port, 5,25... ... Outlet, 6, 26...
・Measuring chamber, 7, 27... Inner lid, 8.28...
... Bolt, 9,29... Annular bulkhead, 10.
30... Rotor, 11, 31... Central shaft, 12, 32... Eccentric bearing stand, 13, 33
......Rotor shaft, 14.34...Lower circumferential surface, 35...Oval hole, 36...Bearing, 3
7...First spring, 39...Second spring,
40...Through hole.

Claims (1)

[Claims for Utility Model Registration] A main body 21 having an inlet 24 and an outlet 25 and a measuring box 22 having a measuring chamber 26 are constructed separately.
An annular partition wall 29 is arranged concentrically in the center of the measuring box 22, and a rotor 30 is arranged so as to be in contact with the inner wall of the measuring box 22 and the outer wall of the annular partition wall 29 and move so as to always block direct communication between the inlet side and the outlet side. At the same time, in a rotary piston type flowmeter in which an eccentric bearing pedestal 32 is disposed within the annular partition wall 29 and aligned with the center of the measuring chamber 26, an oblong hole 35 extending in the radial direction is bored at a predetermined position of the eccentric bearing pedestal 32. The rotor shaft 33 is rotatably and elastically biased outwardly and locked in the oval hole 35, while blocking the measuring chamber 26 from above the measuring box 22 from the outside of the measuring chamber. A rotary piston type flowmeter characterized in that an inner cover 27 is elastically attached so that it can rise.