JPH0413630Y2 - - Google Patents

Description

[Detailed explanation of the idea] B Industrial application field The present invention relates to a twin rotor type flowmeter.

B. Prior Art Conventionally, in a twin rotor type flowmeter, as shown in FIG.
For those that are aligned with center line B of As a rotatable structure, it copes with the need to change the direction of the scale plate. For this reason, the structure is complicated, large and heavy, and installation work is difficult. When adjusting the direction of the scale plate (indicator) to the flow direction, for example, in the case of a flowmeter as shown in Fig. 2, remove the mounting screw 6, remove the cover 7, remove the mounting screw 8, and then Rotate in the desired direction and assemble in reverse order. This work is often done on-site, and the indicator may break if the inside is exposed, or the indicator may malfunction due to contamination with dirt, etc. Also, even in the case of the structure shown in Fig. 1, all you have to do is remove the screw 3a and turn the indicator 3 that is integrated with the cover, but the waterproof O-ring 3b
Because of this, it cannot be easily rotated, and in the end it is necessary to pull it out, change the direction, and press it in again, making it difficult to align the screw holes. Therefore, it is difficult to change the direction of the indicator.

C. Purpose of the invention In view of the above, the present invention consists of a measuring section and an indicating section made up of two independent parts, has a simple and compact structure, and has an indicating mechanism that allows the direction of the indicating section to be changed depending on the flow direction of the meter, as well as to be attached and detached. A low-cost, maintenance-free, multi-use, high-precision twin rotor type flowmeter that can be easily used without exposing the area, and can also be used as a remote flowmeter by removing the indicator and attaching a magnetic sensor to this position. The purpose is to propose.

D. Structure of the invention In order to achieve the above object, the present invention provides a twin rotor type flowmeter in which a pair of rotors 13 and 14 that rotate in proportion to the flow rate are installed in the flow path of the case. The magnet 15 is fixed to one rotor 14 of the pair of rotors and is fixed to the case 10 side and provided on the same axis as the rotor shaft 12 which rotatably holds the rotor 14. The other rotor shaft 11 is rotatably housed in a hole 18 provided in a pressure receiving plate 17 installed on the case, and the other rotor shaft 11 is fixed to the pressure receiving plate 17 on the case 10 side.
and the tip of an auxiliary positioning pin P fixed to the case side are respectively inserted, and a measuring unit is constituted by a case containing the rotor and a pressure receiving plate tightly connected to the case. 24
An indicating mechanism including a yoke 23 rotatably supported by a pivot portion formed integrally with the case and a scale plate is covered with glass 25 to constitute an indicating unit housed integrally with the case. Then, the case 24 of the indicator unit is placed on the upper surface of the pressure receiving plate 17 of the measuring unit so that the yoke 23 is located on the axis of the rotor 14 and opposite to the magnet. A plurality of screws 22 are mounted so as to be slidable and arranged at equal intervals on a circumferential line centered on the axis of the yoke 23.
is screwed vertically between the case 24 and the pressure receiving plate, and the case 24 is connected to the pressure receiving plate so that the direction of the scale plate can be changed.

E. Embodiment An embodiment of the present invention shown in FIGS. 3 and 4 will be described. A non-circular gear type flowmeter has a long shaft 11 and a short shaft 12 fixed to a case 10, and rotors 13 and 14 that rotate freely in proportion to the flow rate while meshing with each other around the long shaft 11 and short shaft 12. A shaft 16 to which a magnet 15 is fixed is fixed to the shaft 16 and rotates together with the rotor 14 in a hole 18 formed in a pressure receiving plate 17 without contacting the shaft 16. Further, the case 10 and the pressure receiving plate 17 are fixed with a tightening bolt 20 with an O-ring 19 interposed therebetween, forming a unit. In this unit, the mounting flange of the pressure receiving plate 17 of the case 10 is eccentrically formed so that the center line of the shaft 16 to which the magnet 15 is fixed is centered.
The indicating section 21 is rotatably attached to the pressure receiving plate 17 with a mounting screw 22 so as to have the same center line. This instruction part 21 is received by a pivot part formed integrally with the case 24 at a position where the yoke 23 which is coupled in response to the rotation of the magnet 15 faces the magnet 15, and is concentric with the rotor 14 and directly connected to the magnet. This structure allows for direct reading of integration instructions via a reduction gear. This interior is evacuated,
The glass 25 is pressed against the O-ring 27 by atmospheric pressure, so that the inside does not become cloudy. In addition, since the reduction gears are made of heat-resistant resin, the load is light and prevents drop in meter sensitivity due to couplings and slipping of couplings. The pressure receiving plate 17 and the case 24 around the coupling portion are made of non-magnetic material to prevent a decrease in coupling torque. In this way, this flowmeter is constructed by combining two independent units: a measuring section and an indicating section.

F. Effects of the invention As described above, the present invention enables direct magnetic coupling coaxially with the rotor by eccentrically centering the center of the measuring section and the center of the indicating section. The lower surface of the bottom of the case 24 of the indicator unit is slidably and rotatably mounted on the upper surface of the yoke 23, and a plurality of screws 2 are arranged at equal intervals on a circumferential line centered on the axis of the yoke 23.
2 is vertically screwed between the case 24 and the pressure plate, and the case 24 is connected to the pressure plate so that the direction of the scale plate can be changed. 22, there is no need to separate the case 24 from the pressure receiving plate 17.
This can be easily done by simply sliding and rotating, aligning the screw holes in both units, and tightening the screws without exposing the internal mechanism of the indicator unit. Furthermore, the structure of the measuring unit is changed by fitting one end of the shaft of the rotor 13 fixedly fixed to the case side to the pressure receiving plate side, and also fitting the auxiliary pin P fixed to the case side to the pressure receiving plate side, so that the magnet 15 is advantageously positioned in the hole 18 of the pressure plate so as to rotate without contacting the peripheral wall.

[Brief explanation of the drawing]

1 and 2 are sectional views showing two examples of conventional structures, FIG. 3 is a sectional view showing an embodiment of the present invention, and FIG. 4 is a plan view thereof. 10... Case, 11, 12... Rotor shaft, 1
3, 14...Rotor, 15...Magnet, 16
...shaft, 17 ... pressure plate, 20 ... tightening bolt, 21 ... indicator, 22 ... mounting screw, 23
...Yoke, 24...Case, 25...Glass.

Claims (1)

[Scope of utility model registration request] A pair of rotors 13, 1 that rotate in proportion to the flow rate
4 installed in the flow path of the case, the rotor 14 is fixed to one of the pair of rotors in the case, and is fixed to the case 10 side to rotate the rotor 14. A magnet 15, which is provided on the same axis as the rotor shaft 12 to be freely held, is rotatably housed in a hole 18 provided in a pressure receiving plate 17 installed on the case, and is attached to the pressure receiving plate 17. Insert the tip of the other rotor shaft 11 fixed on the case 10 side and the tip of the auxiliary positioning pin P fixed on the case side, and tightly fit the rotor inside the case and on the case. The combined pressure-receiving plate constitutes a measuring section unit, and an indicating mechanism including a yoke 23 and a scale plate, which is rotatably supported in a case 24 by a pivot part integrally formed with the case, is covered with a glass 25. The case 24 of the indicator unit is mounted on the upper surface of the pressure receiving plate 17 of the measuring unit.
The yoke 23 is located on the axis of the rotor 14 and is slidably placed opposite the magnet, and is placed on a circumferential line centered on the axis of the yoke 23. A twin rotor characterized in that a plurality of screws 22 arranged at equal intervals are inserted vertically between the case 24 and the pressure receiving plate to connect the case 24 to the pressure receiving plate so that the direction of the scale plate can be changed. type flow meter.