JPH0313693Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow meter with sliding blades.

Conventionally, as shown in FIGS. 1 and 2, a flowmeter having a sliding blade has a rotor 10 mounted on a rotor shaft 101 which is arranged at the center of the flowmeter and is rotatable.
2 are fixed together. The rotor 102 has four blades 10 that can move in and out as the rotor 102 rotates.
3 are housed in a slidable manner in the radial direction of the rotor 102, and the blades 10 are located at opposing positions.
3 is connected to a connecting rod 104. A cam roller 105 is rotatably supported at both ends of the blade 103.
5 is the main body 1 of the flowmeter, with two facing each other as a set.
The plate cam 109 attached to the center of the inside of the upper and lower lids 107 and 108 of 06 is held and rotated. This plate cam 109 has cam surfaces corresponding to the large arc surface 106a and the small arc surface 106b of the main body 106, and the blade 103 is moved in and out as the blade 103 rotates.

Therefore, the rotation of the rotor 102 is transmitted to a rotation take-out mechanism (not shown) provided in the upper lid 107 and takes out the rotation of the rotor 102 via the rotor shaft 101, and is displayed on the flow rate display section 110. It's summery.

However, in this configuration, the two blades are connected to each other as a pair and moved in and out of the rotor by a plate cam, so the sliding resistance of the blades against the rotor is large and the pressure loss before and after the flowmeter is large. It was big. For this reason, the instrumental error performance is poor, especially in the measurement of minute flow rates. Furthermore, since the rotor has a structure in which two opposing blades are connected to each other, the internal structure of the rotor is complicated, and processing and assembly operations are time-consuming and expensive.

The present invention was devised for the purpose of solving the above problems and providing a sliding blade flowmeter with a simple structure.
This will be explained based on FIGS. 5 to 5.

In FIGS. 3 and 4, reference numeral 1 denotes the main body of the flowmeter, which has an inlet 2 and an outlet 3. The main body 1 has a cylindrical shape with an inner surface 1a that is almost a perfect circle, and a blocking block 4 is attached to the inner surface 1a of the main body 1 in contact with the inner surface 1a to cut off communication between the inlet 2 and the outlet 3. ing. A rotor 8 is connected to the main body 1 by an upper cover 6 and a lower cover 7 having bearings 5.
and are placed with their centers aligned. This rotor 8
is integrally fixed to a rotor shaft 9 which is rotatably supported by the bearing 5, and the rotor shaft 9 is connected to a rotation take-out mechanism connected to a flow rate display section 10. The rotor 8 is a cylindrical body having an arc that rotates close to the cutoff block 4.
A gap is provided between the block 4 and the block 4 to prevent liquid from leaking.

The rotor 8 has two rotors in two directions facing each other.
A book sliding groove 11 is cut out. This sliding groove 1
Blades 12 are housed in each of the rotor blades 1 so as to be slidable independently in the radial direction of the rotor, and the inflow port 2 and the outflow port 3 are always blocked by the blades 12. Further, cam rollers 13 are rotatably supported above and below the retreating ends of these blades 12, respectively, and these cam rollers 13 are attached to an upper cover 6 and a lower cover 7, respectively, which are attached to the upper and lower sides of the main body 1 of the flowmeter. It is fitted into the cam groove of the grooved cam 14 so that it can roll freely. This grooved cam 14 is connected to each lid 6,
The cam rollers 13 rotate in contact with these cam grooves. The grooved cam 14 is formed at least inside the outer diameter of the rotor 8, so that the space near both ends of the rotor 8 is closed by the facing surfaces of the lids 6 and 7. As shown in FIG. 3, this grooved cam 14 has a large circular cam groove and a small circular cam groove corresponding to the trajectory of the blade 12 that rotates close to the inner surface 1a of the main body 1 and the cutoff block 4. The large circular cam groove and the small circular cam groove are smoothly connected by a connecting cam groove in which a cam roller 13 is always fitted and rotated.
The sliding movement of the blade 12 is regulated by this. Further, as shown in FIG. 5, this blade 12 is formed with a hole 12c that communicates the sliding groove 11 of the rotor 8 with the inside of the main body 1.
When the blade retreats into the rotor 8 along the grooved cam 14, the liquid in the rotor 8 at the rear end of the blade 12 is trapped and compressed, creating a large resistance to the movement of the blade 12. , has a function of discharging liquid corresponding to the volume that the blade 12 moves through the hole 12c into the main body 1 which communicates with the outlet 3 outside the rotor 8. Conversely, when the blades 12 move outward, negative pressure is created inside the rotor 8 at the rear end of the blades 12, which also creates a large resistance to the movement of the blades 12.
It has a function of introducing liquid from the inlet 2 side into the rotor 8 from the hole 12c by the volume that the blade 12 moves. Thereby, the blade 12 can smoothly move in and out of the sliding groove 11 of the rotor 8.

Further, the tip of one of the blades 12 is configured to be in contact with the inner surface 1a of the main body 1, so that communication from the inlet 2 to the outlet 3 is blocked.

In the flowmeter described above, when liquid flows into the inlet 2, dynamic pressure of the liquid is applied to the blades 12a, and the rotor 8 starts rotating. When the rotor 8 rotates, the cam roller 13 pivotally supported by the blade 12a
rolls along the grooved cam 14, and the blades 12a rotate while being advanced by a predetermined amount outward from the inside of the rotor 8, and the blades 12a, 12 adjacent to each other rotate.
b, the inner surface 1a of the main body 1, and the rotor 8 form a measuring chamber. When the rotor 8 continues to rotate from this state, the blade 12a retreats into the rotor 8 within the sliding groove 11. Since the forward and backward movement of the blade 12a is regulated by the grooved cams 14 on both its upper and lower surfaces, the force that moves the blade 12a back and forth acts equally on both the upper and lower sides of the blade 12a, allowing the blade 12a to slide stably and smoothly. . On the other hand, as the rotor 8 rotates, the other blade 12b located opposite the blade 12a rotates around the rotor 8.
The rotor 8 is moved back inward and the rotor 8 is
Immerse yourself inside. When it begins to separate from the blocking block 4 of the main body 1, it moves outward in the sliding groove 11 under the action of the groove cam 14, and begins to form the next metering chamber.

Furthermore, when the rotor 8 rotates, the blades 12
b is in a state where it has moved forward by a predetermined amount, and the blade 12a
The cam roller 13 reaches the small circular cam groove of the grooved cam 14, and the blade 12a is completely accommodated within the sliding groove 11. Therefore, the blade 12a rotates with a small gap between it and the blocking block 4 of the main body 1.

As explained above, in the present invention, two blades 12 that can move in and out of the rotor 8 are provided in opposite directions, and these blades move independently, so that the sliding resistance of the blades with respect to the rotor is reduced. It is small, and the pressure loss before and after the flowmeter is small.

In addition, since the cam rollers 13 at both ends of the blade roll along the respective grooved cams 14, the blade 12 does not tilt, so the resistance when the blade 12 moves in and out is reduced, and the blade 12 operates easily without uneven wear. . Furthermore, in order to restrict the movement of the blades 12 by the grooved cams 14, the blades 12
Since there is no pressure contact between the blade 12 and the inner surface 1a of the main body 1, there is almost no wear on the tip of the blade 12 and the inner surface 1a of the main body 1. Therefore, the measurement accuracy in the minute flow rate range is improved, and the measurement accuracy can be maintained over a long period of time. Further, since the two blades are structured to move independently of each other, the structure is relatively simple, processing and assembly can be performed in a short time, and the blade can be provided at low cost. Furthermore, since the blade is formed with a hole that communicates between the sliding groove of the rotor and the inside of the main body, there is no resistance when the blade moves in and out, and extremely remarkable effects such as smooth movement of the blade can be obtained.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional plan view of the main part showing the conventional example, Fig. 2 is a cross-sectional view of the main part along the line A-A in Fig. 1, Fig. 3 is a cross-sectional plan view of the main part of the present invention, and Fig. 4 is a cross-sectional plan view of the main part of the present invention. B- in Figure 3
FIG. 5 is a sectional view of the main part taken along line B, and FIG. 5 is an enlarged perspective view of the main part of the blade. 1 is the main body, 1a is the inner surface, 2 is the inlet, 3 is the outlet, 4 is the shutoff block, 5 is the bearing, 6 is the upper cover, 7
is a lower lid, 8 is a rotor, 9 is a rotor shaft, 10 is a flow rate display section, 11 is a sliding groove, 12, 12a, 12b are blades, 12c is a hole, 13 is a cam roller, 14
is a groove cam.

Claims (1)

[Claims for Utility Model Registration] A rotatable rotor 8 is arranged in the main body 1 having an inlet 2 and an outlet 3, and the rotor 8 reciprocates within a sliding groove 11 formed in the radial direction. In a sliding blade flowmeter in which a freely movable blade 12 is loosely inserted, a rotatable cam roller 3 is pivotally supported at both ends of the retreating end of the blade 12, which has a hole 12c that communicates the main body 1 and the sliding groove 11. The cam roller 3 is fitted into cam grooves of grooved cams 14 formed on the upper cover 6 and lower cover 7 located at both ends of the rotor 8, and the movement of the blades 12 is regulated by the grooved cams 14, respectively. Sliding blade flowmeter.