JPS60135721A - flow rate detection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flow rate detection device for measuring the flow rate of fluid.

Conventional configuration and its problems The conventional flow rate detection device in this building is configured as shown in FIGS. 1 and 2. In FIGS. 1 and 2, reference numeral 1 denotes an annular flow path having a circular cross section, and an inflow path 2 and an outflow path 3 are opened at the outer periphery of this flow path. This inflow passage 2 is provided with a nostle 4. Further, a sphere 5 is inserted into the annular flow path 1, transparent windows 6 and 7 are formed, and a light emitting element 8 and a light receiving element 9 are provided. In such a configuration, when fluid enters the annular channel 1 through the nozzle 4 of the inflow channel 2, the flow does not circulate within the annular channel 1, so tA'f
, flows from the person passage 2 to the outflow passage 3, and at the same time, the sphere 5 also rotates in the annular passage 1 in the direction of the solid arrow in the figure.

Since the number of revolutions of this sphere is proportional to the flow rate of the fluid, the number of revolutions of the sphere 5 is determined by the number of revolutions of the light emitting element 8 and the light receiving element 9.
It is detected as a pulse signal and the flow rate is measured through the control circuit.

The first problem with this conventional example is that the flow resistance is large. The inlet and outlet of the circular channel forming the annular flow channel 1 change direction and thereby.

In addition, since the circulation flow intersects with the flow from the inflow passage 2 in the vicinity of the inflow passage, this causes flow resistance and loss. Also, when the sphere is configured to have a size close to the cross-sectional area of the annular flow path 1 so as to promote the rotation of the sphere 5, a large flow path resistance occurs. Further, if a nostle 4 is provided in the flow passageway 2 so as to make the circulation of the sphere 5 smooth, the flow resistance becomes even greater. Second, there are structural issues, such as the fact that the sensor structure tends to be large. As mentioned above, the passage resistance increases, so it is necessary to increase the passage diameter to reduce it.Also, since it has an annular flow passage 1 compared to a straight pipe, a corresponding space is required. The sessa as a whole is larger than the front and rear passages. In addition, drifter passage 2
The direction of the outflow passage 3 will be limited to some extent,
When incorporated into equipment as a sensor, there are problems such as structural constraints, stiffness, and an increase in overall size.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome these conventional drawbacks and to provide a compact, compact flow detection device with low flow resistance.

Structure of the Invention In order to achieve this object, the present invention includes a first curved blade that swirls the fluid to be detected in an axial flow, a rotating body that revolves due to the swirling flow, and a first curved wing that is provided at a downstream position of the rotating body. The first curved wing and the second curved wing are configured to be 180 degrees symmetrical with respect to each other. With this configuration, the fluid to be detected is swirled once,
By rotating a rotating body having a smaller area than the flow path cutter 11Ii in this swirling flow, it is possible to obtain a compact and compact flow rate detection device having an extremely small flow resistance.

DESCRIPTION OF EMBODIMENTS Next, embodiments of the present invention will be described based on FIGS. 3 to 5. In FIGS. 3 and 4, 10 is a housing, and inside this housing 10 there is a circular rA wing 11 fixed to the casing 12, which is a first curved wing that swirls the pressurized fluid in an axial flow. . A rotating magnetic sphere 13 is provided downstream of the arcuate blade 11 and has a smaller diameter than the cross-sectional area of the flow path that revolves perpendicularly to the flow direction.

The configuration of this magnetic sphere includes a steel ball, a hollow steel ball, and a sphere made of resin coated with magnetic plating and then resin molded. +1il Note Downstream of the magnetic sphere 13, a second curved blade 14 is fixed to the casing 12 and is configured 180 degrees symmetrically with respect to the circular blade 11. That is, the shape of the arcuate blade 14 is the same as that of the arcuate blade 11. The casing 12 is inserted into the housing 10 and C
It is fixed by a ring 15. Also bouncing 10
A rotation detector 18, which is a detection means for the magnetic sphere 13 and is composed of a permanent magnet 16 and a magnetoresistance element 17 which is a magnetic detection element, is provided outside of the flow rate detection device.

19 and 20 are piping connection ports, 21 is an arrow indicating the flow direction, and 22 is an arrow indicating the rotation direction of the magnetic sphere 13.

The operation in the above configuration will be explained with reference to FIGS. 3 and 4. In FIG. 3, when the fluid to be detected flows from the direction of the arrow 21, i.e. from the direction of the piping connection 19, the fluid to be detected flows along the arcuate blades 11 and undergoes axial swirl. As a result, the 4a sphere 13 placed in the swirling flow
obtains a kinetic force from the swirling flow and rotates in a direction perpendicular to the flow direction shown by arrow 21. 0i I magnetic sphere 13
The fluid to be detected which has passed through the position is axially swirled by the arcuate blades 14 in the same direction as the circumferential direction of the magnetic sphere 13 and flows downstream. The number of rotations around the magnetic sphere 13 measures the flow rate, so by measuring the number of rotations of the magnetic sphere 13, the flow rate can be measured. In this method, a magnetic field of a constant strength is applied to the magnetoresistive element 17 by the permanent magnet 16, and when the magnetic sphere 13 passes through this magnetic field, the change in resistance of the magnetoresistive element 17 is extracted as a pulse change in voltage. 31 measurements are performed via a control circuit (not shown).

Figure 4 shows the inflow direction of the fluid to be detected. @'Connection[''20
As shown in the side view, the fluid to be detected is swirled by the arcuate blades 14 in a clear 11 flow, and as a result, the magnetic sphere 13 is rotated in the direction of the arrow 22. The number of revolutions of this magnetic sphere 13 is
? tallJ is the same as that in FIG. 3, and its explanation will be omitted.

In this embodiment, the curved blade is composed of a circular arc blade, and the flow loss can be reduced with a simple blade shape.

In addition, since the rotating body is composed of a sphere, the contact angle during orbiting is
II! It is a point contact and the contact resistance during rotation becomes smaller,
Circulating motion of the rotating body can be easily obtained even at low flow rates, improving measurement accuracy. Moreover, since it is a sphere, the fluid resistance during rotation is also small, which has the effect of reducing pressure loss. Furthermore, the rotating body is made of a magnetic material and is detected by a magnetic sensor, which has the effect that even if the fluid is opaque, previous measurements can be made from outside the flow path.

Next, another embodiment of the present invention will be described with reference to FIG. Fifth
In the figure, inside the housing 22, a first curved wing 23 and a second curved wing 24 are integrated with each other. A magnetic sphere 25 is also provided. Reference numerals 26 and 27 indicate piping connection ports, and 28 and 29 indicate arrows indicating the direction of rotation of the magnetic sphere 25.

Next, to briefly explain the operation of the above configuration, when five people enter the fluid to be detected from the piping connection port 26, the magnetic sphere 25 rotates in the direction of the arrow 28, and when the fluid to be detected flows from the piping connection port 27, the magnetic sphere 25 rotates. 25 revolves in the direction of arrow 29. The secondary side of the rotational speed is as described in [)1'', and its explanation will be omitted.

In this embodiment, since the arcuate blades 23 and 24 are integrated, it is easy to arrange the centers +Il+ of the arcuate blades 23 and 24 in a straight line, and a stable swirling flow can be created. This has the effect of stabilizing the orbiting movement and increasing the stacking capacity.

Effects of the Invention As is clear from the above description, the flow rate detection device of the present invention includes a first curved blade that axially swirls the fluid to be detected flowing in a flow path, and a first curved blade that is located in this swirling flow and extends in the direction of the flow. A rotating body that rotates perpendicularly to the rotating body, and a detected object located downstream of the rotating body in the same direction as the rotational direction of the rotating body.
The second curved wing that makes the ll flow swirl, and the circumference of the rotating body 1! , 11, consisting of detection means for detecting the number of rotations,
The curved wing and the second curved wing have the following effects by configuring them to be 180 points symmetrical with respect to each other.

(1) Low flow resistance. Since the fluid to be detected is axially swirled by the curved blades, the loss when the flow is converted into a swirling flow is extremely small. The rotating body is also configured to have a smaller diameter than the cross-sectional area of the flow path, so that the flow resistance of the rotating body during rotation is small.

Furthermore, in comparison with conventional Hall type flow rate sensors, the flow resistance of the fluid is extremely small, as there is no extreme change in the flow path, and there is no interference with the fluid itself.

(The structure of the 2-inch flow rate detection device is small and compact.

Unlike those that form an annular flow path, the feature is that an axial flow is generated in the straight pipe section and a rotating body is circulated, so the flow path structure is the most non-pull and the flow path length can be configured to be short. .

0) Flow rate measurement is possible without delay in one flow direction of the fluid to be detected. 1801 between the first curved wing and the second curved wing
By having a 314-point configuration and providing a rotating body between these curved blades, it is possible to measure two-way flow of the fluid to be detected, and its applicability is wide.

[Brief explanation of the drawing]

Fig. 1 is a horizontal sectional view of a flow path of a conventional flow rate detection device', Fig. 2 is a vertical sectional view of the same device, and Figs. 3 and 4 each show an embodiment of the present invention. FIG. 5 is a cross-sectional view of the flow rate detection device, and is a cross-sectional view showing another embodiment of the present invention. 11...first curved wing (arc wing), 13...
・Rotating body (magnetic sphere), 14... Second curved wing (
arcuate blade), 18... detection means (rotary ejector). Name of agent: Patent attorney Toshio Nakao 1 person! 1
Figure 3 Figure 2 SR3 Figure 5? the law of nature

Claims (3)

[Claims] (1) A first system that rotates the detected fluid flowing in the flow path in an axial flow.
a curved blade of the rotating body, a rotating body located in the swirling flow and rotating axially in a plane perpendicular to the direction of the flow, a second curved blade placed downstream of the rotating body, and a second curved blade of the rotating body. A flow rate detection device comprising a means for detecting the revolution speed, and a first curved blade and a second curved blade are configured to be 180 degrees symmetrical with respect to each other. (2) The flow rate detection device according to claim 1, wherein the curved blade is an arcuate blade. (3) The flow rate detection device according to claim 1, wherein the rotating body is a spherical body. flow rate detection device.