JPH01253617A - Water level detector - Google Patents

Abstract

PURPOSE:To obtain a highly accurate water level gage whose readjustment is not required even in case of sudden change and the like in water level, by moving a float to which a magnet is provided up and down along a guide member in which magnetic sensors are incorporated, and sequentially scanning the change in outputs of the magnetic sensors. CONSTITUTION:A plurality of magnetic sensors 16 are arranged in a nonmagnetic hollow pipe 10 at a desired interval. A float 11 in which a magnet 14 is attached along the pipe 10 is provided so that the float 11 can be moved in the up-and-down directions. When a water level is fluctuated, the float 11 is moved up and down. The magnet 14 attached to the float 11 drives the magnetic sensors 16. The positions of the driven magnetic sensors are sequentially scanned through a specified scanning circuit. The read value is transduced into the water level. The result is transmitted to a remote control station and the like. Even if the water level is suddenly changed and lowered to the value beneath a measuring range, readjustment is not required. The water level can be detected at an accuracy of + or -1cm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial Application Field> The present invention relates to a water level detection device for controlling output in a hydroelectric power plant or the like.

(Prior Art) Conventionally, a water level detection device for controlling output in a hydroelectric power plant, etc., has been designed to connect flows 1 to 1 suspended in a water tank (not shown) to a balance weight via a wire 2, as shown in FIG. 3, the wire 2 is connected to the wire drum 4, and the rotation of the wire tram 4 is controlled by a potentiometer through a gear 5.
The water level was detected by transmitting the signal to the celsin transmitter or encoder 6. This method has the advantage of being within ±1 cm regardless of accuracy or detection span.

In addition, a method of detecting water level using a pressure sensor (problem to be solved by the invention) However, if the water level changes suddenly, flow 1 to
1 and the balance weight 3 may become temporarily unbalanced and the wire 2 may come off the wire drum 4, or when a water tank is used for mechanical overhaul at a hydroelectric power plant, the wire 2 may come off the wire drum 4. The adjustment position may shift.

In this case, it may be necessary to readjust the reference position, or the water tank of the hydroelectric power plant may be several 1007r7 away from the location where the water wheel is installed.
In addition, the method using a pressure sensor requires a wired Is there any deviation?The error is a few percent of the measurement span.
Because of this, there is an error of 30 to 50 within the measurement range of Ion.
cm, and cannot be used to adjust the output of hydroelectric power plants.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a water level detection device with high accuracy, which does not cause wires to come off or shift the position of the % die due to sudden changes in water level.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a guide member formed in a hollow shape from a non-magnetic material and disposed along the vertical direction, and a guide member that is movable in the vertical direction. A float that is freely guided and has magnets i~ attached thereto, and a plurality of magnetic sensors that are equally distributed at desired intervals along the vertical direction inside the guide section and are driven by the magnetic force of magnets 1~. The magnetic sensor is characterized by comprising a circuit that sequentially scans changes in the magnetic sensor to read its position, and a transmission circuit that transmits the output of this circuit to a remote location.

(Function) [When 1-1~ moves up and down in response to fluctuations in water level,]
l]-j- to drive the pulled magnet [to magnetic sensor 1]. There, the magnetic sensor is sequentially scanned, the position of the driven sensor is read, the output is converted to the water level, and the output is transmitted to a remote location (such as a control center).

(Example) An example of the present invention will be explained below with reference to the drawings.
, FIG. 2 shows the configuration of an embodiment of the present invention.

At d3 in the same figure, the pipe 10 is formed of a non-magnetic material, guides the vertical movement of the annular FOs 1 to 11 on its outer circumferential surface, and has a lower end of the pipe 10 on the lower side of the FOs 1 to 11 (~flange 12a). , close to the upper end) upper side of rl-1 to 11 - brim 12
Attach LJ and the case 13 to the upper end.

In addition, a pair of magnets 1 to 14 are attached to the flow pipe 11 (A1, and a pair of magnets 1 to 14 that cover the inner circumferential surface in a diametrical direction are installed).
A board 15 is installed inside the board 15 along the vertical direction, and magnetic sensors 16 are mounted on this board 15 at regular intervals at intervals required for measurement accuracy. Use one that performs switching operation.

As shown in FIG. 2, the case 13 includes a scan circuit 17 for reading the output of the magnetic sensor 16, and a microprocessor (hereinafter referred to as CPU) 18 to read the output of the magnetic sensor 16.
It houses a circuit for detecting the position of the camera, a transmission circuit 19, etc. Note that the reference numeral 20 in the figure does not indicate an abnormality alarm.

Next, the operation of the water level detection device configured as above will be explained. In this configuration, magnets 14 in flows 1 to 11 indicate the water surface, and magnets 1 to 14 or pipes 10
The magnetic sensor 16 corresponding to the water surface inside is operated. C.P.
U18 is turned on to sequentially advance the scan circuit 17 by incrementing the numbers 1 to 1 by one. Magnetic sensor 1
6 operates, the water level can be converted, that is, the water level can be detected by knowing the number of the magnetic sensor 16 from the numbers 1 to 6.

= 5- Depending on the water level (2 magnetic sensors in 1 skin)
In some cases, the count is turned on, but in this case, the average value of each count is output. In addition, a plurality of non-adjacent magnetic sensors 1
If 6 is turned ON, an abnormality of the magnetic sensor 16 is output.

The detected water level is transmitted to the control center via the transmission circuit 19 based on water level data from the CPU 18. The transmission method uses digital transmission such as R3232C.

d3. In the above-described embodiment, the float 11 was placed outside the pipe 10, but the flows 1 to 1 may be placed inside the pipe. Furthermore, the magnetic sensors may be duplicated to improve reliability.

[Effects of the Invention] As described above, according to the present invention, unlike conventional wires and toms are not used to detect the water level, there is no wire disconnection, and even if the water level suddenly changes or the water level falls below the measurement range, it will not occur again. There is no need for adjustment and maintenance is easy. However, it is a float method, and the measurement accuracy is determined by the installation of the magnetic sensors (the spacing between them) and can be within ±1 cm.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing essential parts of an embodiment of the present invention, and FIG. 3 is a configuration diagram showing a conventional water level detection device. 10...Pipe 11...Float 14...Magnet 16...Magnetic sensor 17...Scan circuit 18...Macro processor 19...Transmission circuit (8733) Agent Patent attorney Sho Inomata Akira (and others)
1 person) Figure 1 Figure 2-7 = Figure 3

Claims (1)

[Claims] A guide member formed in a hollow shape from a non-magnetic material and disposed along the vertical direction, a float that is guided to move freely in the vertical direction by the guide member and has a magnet attached thereto, and a float inside the guide member. A plurality of magnetic sensors are equally distributed at desired intervals along the vertical direction and are driven by the magnetic force of the magnet, a circuit that sequentially scans changes in the magnetic sensors and reads their positions, and a circuit that remotely transmits the output of this circuit. A water level detection device characterized by comprising a circuit for transmitting data to the ground.