JPS6237136Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a rectifier for a turbine meter.

Traditionally, turbine meters that measure the flow rate of fluid have straight flow pipes installed before and after the meter, and the straight sections are relatively long, and two-dimensional and three-dimensional flows prevent complicated flows from occurring. In order to improve measurement performance, it was important to install the sensor in a certain area. Therefore, in the past, a turbine meter was rarely attached to a vertical piping section, and actual measuring meters were mainly used. However, actual measuring meters have problems with their structural durability, and also have the problem of becoming inoperable due to foreign matter in the fluid.

Therefore, the purpose of the present invention is to make it possible to install a turbine meter without degrading the metering performance even in vertical piping. , bearing parts 1a and 2a of the turbine blade 3 are provided to be located on the center line of the inlet 5 and the outlet 6, and fluid flow passages 1b and 2b are provided so as to surround the outer periphery of the bearing parts 1a and 2a, The flow paths 1b, 2b
has a flow cross-sectional area larger than that of the inlet 5 and communicates with the inlet 5 and the outlet 6, and has a turbine blade 3 supported by the bearings 1a and 2a in the flow passage. In the flow passage 1b located upstream of the turbine blade 3,
It is characterized in that a radial rectifying plate 4 is provided centered on the bearing portion 1a.

In the embodiment shown in the drawings, the case consists of a lower case 1 and an upper case 2, the bearing part 1a on the lower case 1 side is supported by a rectifier plate 4, and the bearing part 2a on the upper case 2 side is connected to a flow path 2b. It is supported by a transverse support plate 2c. In the figure, 8, 1
1 is a bearing, 9 and 10 are pivot bearings, and 12 is a pivot, which rotates the rotating shaft 3a of the turbine blade 3.
is rotatably supported. A magnet 7 is provided on the rotating shaft 3, and a magnetoresistive element 14 detects the rotational speed of the turbine blades and transmits the signal to the counter section through a lead wire 15. Reference numeral 16 denotes an O-ring that reels the threaded portions of the upper and lower cases 1 and 2.

As described above, the fluid to be measured is transferred to the inlet 5.
When the fluid is allowed to flow in more, the fluid to be measured flows through the inlet 5.
It flows into the flow path 1b having a flow cross-sectional area larger than that of the flow path 1b, is diffused, and its flow velocity is reduced and the flow is rectified by the rectifier plate 4. Therefore, the fluid to be metered passing through the turbine blade 3 section becomes an undisturbed flow, and it is possible to effectively obtain rotation of the turbine blade in proportion to the flow rate.

As described above, according to the present invention, the flow cross-sectional area of the flow passage 1b is increased to lower the flow velocity, the rotational speed of the turbine blade is lowered, and the durability is improved. By providing a turbine meter, it is possible to effectively obtain rotation of the turbine blades proportional to the flow rate. Therefore, the turbine meter of the present invention can be installed in a vertical pipe that does not have a straight and relatively long flow path before and after the meter, for example. , it has the advantage that it can be installed in a conduit that has a bent pipe immediately before the upstream without reducing measurement performance.

FIG. 3 shows an instrumental error characteristic curve of a flowmeter according to an embodiment of the rectifier of the present invention. As shown in the performance curve in Figure 3, the maximum flow rate range has been expanded to 7300/h (compared to 4400/h with conventional actual measurement type (rotary piston type) flowmeters), and the instrumental error has been further reduced. Even when included, it remained within 2%. In the figure, the diagonal lines in the large flow area indicate variations in instrumental error.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side sectional view, FIG. 2 is a sectional view taken along the line A-A in FIG.
FIG. 3 is a diagram showing a performance curve. 1...Lower case, 2...Upper case, 1a,
2a...Bearing part, 1b, 2b...Flow path, 3...
Turbine blade, 4... rectifying plate, 5... inlet, 6...
...outlet.

Claims (1)

[Scope of utility model registration request] In a case having a fluid inlet 5 and an outlet 6, bearing parts 1a and 2a of the turbine blade 3 are provided so as to be located on the center line of the inlet 5 and the outlet 6, and the outer periphery of the bearing parts 1a and 2a is provided. Fluid flow paths 1b, 2b are provided so as to surround the fluid flow paths 1b, 2b.
has a flow cross-sectional area larger than that of the inlet 5 and communicates with the inlet 5 and the outlet 6, and has a turbine blade 3 supported by the bearings 1a and 2a in the flow passage. In the flow passage 1b located upstream of the turbine blade 3,
A rectifying device for a turbine meter, characterized in that a radial rectifying plate 4 is provided centered on the bearing portion 1a.