JPS6133469B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a device that is primarily used to measure the flow velocity of underground water that is lowered into a bored underground hole, and can also be used to measure the flow velocity of fluids such as seawater and industrial water. The present invention relates to a usable fluid measurement device.

Measuring the flow velocity of groundwater is an extremely important matter when constructing dams, etc., but conventionally, this type of measuring device measures the flow velocity by lowering it into an underground hole using the rotation of a water wheel. Ta. However, when the flow rate of groundwater is minute, the water wheel cannot be rotated, making the measurement of the minute flow rate inaccurate. The present invention aims to eliminate these drawbacks and provide a flow rate measuring device capable of accurately measuring minute flow rates. This invention provides a water flow passage part in a part of a casing suspended in flowing water such as underground water or seawater, and arranges a needle float with a float shaft as a conductor in the water flow passage part, and also arranges a needle float at one end of the needle float in the water flow passage part. is rotatably mounted, the other end is a free end, and a center restoring sliding plate with a conically inclined surface facing the free end is provided inside the casing near the free end of the needle float, and An annular contact part is provided at the bottom of the sliding plate to make contact with the float shaft, and it is further equipped with an electric pressing means to slide the sliding plate toward the free end of the needle float, and a time measuring device for counting time. The present invention relates to a flow rate measuring device which is provided with a count stop circuit for stopping the operation of the time measuring device by contact between the float shaft of the needle float and the annular contact portion.

Embodiments will be described in detail below with reference to the drawings.

This example is an example in which the flow velocity and the direction of the water flow can be measured at the same time. Figure 1 is a partially cutaway front view showing the embodiment, Figure 2 is an explanatory diagram showing the restored state of the needle float, and Figure 3 is a diagram showing the needle float tilted by the water flow and in contact with the annular contact part. A partially cutaway front view showing the state; FIG. 4 is an explanatory view showing the state in which the embodiment device is lowered into an underground hole to perform measurements;
FIG. 5 is an electrical wiring diagram of this embodiment.

In the figure, 1 is the casing, 2 is a sealed transparent storage tube inserted into the casing so that it can be raised and lowered, 3 is a sliding plate for restoring the center attached as the bottom plate of the storage tube, 4
is a conical inclined surface of the same sliding plate, 5 is an annular contact part provided at the bottom of the same sliding plate, 6 is a water flow passage part of the casing 1, 7 is a needle float, 8 is a conductive float shaft of the same needle float, 9 is a moving float of the same needle float,
10 is an iron ball that serves as a pivot point for the same-needle float; 11
12 is a spherical contact provided at the top of the float shaft 8, 12' is a spherical magnet provided at the head of the float shaft, and 13 is for restoring the center. A magnet for sliding the sliding plate 3 (storage tube 2) downward; 14 is a movable pressing rod of the magnet; 15 is a center restoring sliding plate 13; a spring for lifting the storage tube 2 upward; 16; is the limit seat, 17, 17' is the storage pipe 2
Two magnetic needles are installed inside for measuring the direction of water flow, 18 is the indicator needle of the same needle, 19 is the azimuth scale plate of the same needle, 20 is the fixed lever of the indicator needle 18, and 21 is the pressing operation of the fixed lever. A rod, 22 is a magnet that presses down the pressing rod, 23 is a terminal, 2
4 is a connector, 25 is a magnetically permeable strainer in an underground hole, 26 is a hanging cord, 27 is a measuring device, 28 to 3
4'' relates to the internal circuit within the measuring instrument, 28 is a changeover switch for selecting direction measurement, flow velocity measurement, and off; 29
is a preparatory operation for restoring centering needle float 7, cutting,
30 is a relay, 31 is a relay contact of the relay, 32 is a time measuring device for measuring flow velocity, 33 is a battery, 34,3
4', 34'' are indicator lamps.

In this embodiment, the needle float 7 is located below the center restoring sliding plate 13, but this may be reversed.

In this embodiment, if the casing 1 and its attached equipment are lowered into the groundwater of the underground hole as shown in FIG. The air is only slightly compressed and has a water level lower than the groundwater level, and the needle float 7 is submerged in the water leaving the upper part above the water level, and due to the fluid resistance caused by the flow of groundwater, the needle float 7 is lower than the iron at its lower end. It tilts in the direction of water flow using the ball 10 as a rotational fulcrum (see Fig. 3). To measure the flow velocity, first turn the changeover switch 28 of the measuring device 27 on the ground side to the flow rate measurement side, and then turn the other changeover switch 29 to the preparation operation side. Then, the magnet 13 and battery 33 inside the casing 1 become energized, the magnet 13 works, the movable pressing rod 14 swings downward, and the free end of the movable pressing rod presses against the top plate of the storage tube 2. The storage tube 2 is pushed down against the spring 15, and the center restoring sliding plate 13 attached as a bottom plate of the storage tube 2 also slides toward the spherical magnet 12 at the free end of the needle float 7. The conical inclined surface 4 on the inner surface of the sliding plate 13 contacts the spherical magnet 12' at the free end of the needle float 7, and the sliding plate 13
When is pushed down, the spherical magnet 12' slides toward the center along the inclined surface 4, and the needle float 7 is forced to stand upright at the center. In this state, if the changeover switch 29 is turned to the time measurement operation side, the magnet 13 will no longer operate, the pressing force of the movable pressing rod 14 will be lost, and the storage pipe 2 and its The sliding plate 3 for restoring the center of the bottom plate is lifted upward, the fixed state of the free end of the needle float 7 is lost, and the needle float 7 becomes freely rotatable again and collapses in the direction of the water flow due to the fluid resistance of the water flow. . At the same time as the changeover switch 29 is pushed down, the time measuring device 32 is energized and starts counting the time. After a predetermined period of time after the needle float 7 falls down, it comes into contact with the annular contact portion 15 at the bottom of the center restoring sliding plate 3, and the contact formed between the float shaft 8 of the needle float 7 and the annular contact portion 5 is closed. When the contact closes, the relay 30 operates, the normally closed relay contact 31 of the relay opens, and the time measuring device 32 stops operating.
The count time up to that point is retained.

The time required for the needle float 7 to reach the annular contact portion 5 from the center is displayed as a count time, and since this time also varies depending on the flow velocity of the water flow and uniquely corresponds to the flow velocity, this count Groundwater flow velocity can be uniquely determined depending on time. Moreover, since the needle float 7 sufficiently reacts (tilts due to resistance) even to minute flow velocities, accurate measurements can be made even at minute water flow velocities.

Note that in this embodiment, the direction of water flow can also be accurately measured. Briefly, one magnetic needle 17 is operated by the earth's magnetism, and the other magnetic needle 17'
is actuated by a spherical magnet 12' at the tip of the needle float 7, and since the needle float 7 is tilted in the direction of the water flow, the magnetic needle 17' indicates the direction of the water flow. Therefore, by immersing the casing 1 in underground water and energizing the magnet 22, the indicator rods 18 of the two magnetic needles 17, 17' are simultaneously fixed via the pressing rod 21 and the fixing lever 20. If the entire casing is lifted above the ground in a fixed state and its magnetic needle 17 is aligned with the geomagnetic direction on the ground, the pointer 18 of the other magnetic needle 17' will indicate the direction of the water flow. In this way, the direction of water flow can also be measured.

As described above, according to the present invention, the rotatable needle float 7 that tilts in response to the minute velocity of water flow,
Sliding plate 1 having a conical inclined surface 4 and an annular contact portion 5
3. With the configuration including the electric pressing means for pressing the sliding plate, the time measuring device 32, and the time count stop circuit, it is possible to accurately measure even the minute speed of water flow, and the flow speed can be easily measured. be.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the flow velocity measuring device of the present invention, Fig. 2 is an explanatory diagram showing the state in which the needle float is restored, and Fig. 3 is a state in which the needle float is tilted by the water flow. Partially cutaway front view showing 4th
The figure is an explanatory diagram showing a state in which the device is lowered into an underground hole for measurement, and FIG. 5 is an electrical wiring diagram of this embodiment. 1...Casing, 3...Sliding plate for center restoration, 4...
Conical inclined surface, 5... Annular contact portion, 6... Water passage portion, 7... Needle float, 8... Float shaft, 13... Magnet, 14... Movable pressing rod, 15... Spring, 25... Strainer, 26... Hanging cord , 27
... Measuring device, 28, 29... Changeover switch, 30... Relay, 31... Relay contact, 32... Time measuring device, 3
3...Battery.

Claims (1)

[Claims] 1. A water flow passage part is provided in a part of the casing suspended in flowing water such as groundwater or seawater, and a needle float with a float shaft as a conductor is placed in the water flow passage part, and one end of the needle float is rotated. The needle float is attached movably, the other end is a free end, and a center restoring sliding plate with a conically inclined surface facing the free end is provided inside the casing near the free end of the needle float, and the sliding plate An annular contact portion for contacting the float shaft is provided at the lower part of the sliding plate, and is further equipped with an electric pressing means for sliding the sliding plate toward the free end side of the needle float, and is further equipped with a time measuring device for counting time. A flow rate measuring device comprising a time counting stop circuit that stops the operation of a time measuring device by contact between a float shaft of a needle float and the annular contact portion.