JPS6285821A - Reverse connection detecting device for water meter - Google Patents

Abstract

PURPOSE:To inspect the reverse connection of a meter automatically in a short time by detecting intervals of a characteristic electric signal generated in case of the reverse connection by a sensor by a checker when the rotation of a driven magnet is detected by the sensor. CONSTITUTION:When water is flowed while a tap at the downstream of the meter is fully open, its flow rate is 1-2m<3>/h and the driven magnet 16 rotates fast forward continuously as long as the meter is connected correctly. For example, when gears have such a ratio that one turn is made at each interval of 40l, the magnet 16 makes one turn in 2.4-1.2min at 1-2m<3>/h. The sensor 31 detects its rotating speed and generates high-density pulses continuously. Further, if the entrance and exit of the meter are connected reversely, a reverse rotation preventing mechanism (notched gear, etc.) provided in a train wheel engaging the magnet 16 operates, so when the water is flowed to reverse an impeller, the magnet 16 repeaters reversing, stopping, and fast forward rotation at the same speed with a driving magnet 5. Consequently, the electric signal generated by the sensor 31 has a short and a long period alternately. This is observed by the checker to confirm the reverse connection of the meter.

Description

DETAILED DESCRIPTION OF THE INVENTION A.0 Objective of the Invention E.1. FIELD OF INDUSTRIAL APPLICATION This invention relates to a device for detecting when a water meter is incorrectly connected to a pipe in the wrong direction.

E2. The transmitter of the conventional power-generating water meter is buried underground together with the metering section, and is connected to a receiver installed at a remote location by two electric wires. A unit flow rate pulse of 1 m/pulse is used as the electric pulse from the transmitter.

In Fig. 13, (1+ is a metering section, where an impeller (2) is rotatably supported in the fluid passage, drives the pointer (4) via a reduction gear train (3), and provides magnetic coupling. The constituent drive magnets (5) are rotated.

Water enters through the inlet (6), rotates the impeller (2), and flows downstream through the outlet. (8) is the dial, (9) is the glass, 0ω is the transmitter mounting member fixed to the center of the glass (9), (11) is a Nando for fixing the member 00) to the glass (9), (12) is the nut (11) and washer (1
3) is a leaf spring fixed in the center of the glass (9).

The drive magnet (5) in this figure is magnetized into two poles in the diametrical direction, and the gear ratio in the reduction gear train (3) is determined so that it rotates once per 4i of water passing through the magnet.

(I4) is a transmitter, which has a cylindrical case as a whole, and the lower end protrusion (15) of the case fits into the recess at the center of the transmitter mounting member 00), and fits into the groove on the outer periphery of the case. The engagement of the leaf spring (12) causes the transmitter (14
) is attached and fixed to the upper part of the measuring part (1). (Eng. 6
) is the shaft (1) fixed to the receiving plate (17) of the transmitter (I4).
A driven magnet fixed to a pinion (19) rotatably engaged with the drive magnet (5) forms a magnetic coupling with the drive magnet (5), and transmits the rotation of the measuring section (1) to the transmitter (14);
It rotates at the speed of one rotation every time 4ON is measured. The transmitter (14) includes a generator (20), a gear train that decelerates the rotation of the driven magnet (16), a reverse rotation prevention mechanism provided in the gear train, and a tooth train, as will be described later. A spring is wound up by a spring to store energy, and the energy of this spring is released every fixed rotation of the tooth train to generate the generator (
20), and has an intermittent feeding mechanism that drives the generator (20) intermittently, and generates electric pulses (unit flow rate pulses) by a transmission cord (23) having two electric wires connected at one end to the coil of the generator (20). is transmitted to the receiver (24) in FIG.
The two wires of the transmission cord (23) connect to the receiver (24)
The receiver (24) is connected to the coil of a pulse motor (not shown) in the terminal box (25) of the receiver (24). The pulse motor advances each time it receives the unit flow rate pulse, rotates the display number wheel, and the display number (26) indicates the integrated flow rate in units of d.

As shown in FIG. 15, the conventional transmitter (14) and receiver (24) have a generator coil (27) and a pulse motor coil (27') connected to two electric wires (21) (22).
) are electrically connected by a transmission cord (23) having terminals (28) (29) in the terminal box of the receiver (24).
) are removably connected.

E3. Problems that the present invention aims to solve In the above-mentioned conventional power-generating water meter, the measuring part +11 and the transmitter (14) are buried underground.
24) was visually checked to ensure that the display did not step forward for each unit flow rate pulse. However, even if the outlet downstream of the meter is fully opened and water flows at a rate of 1 to 2 d/'h, the
It takes too much time and is not practical because it only takes one pulse step without passing the time.

The same applies to checking for fixed malfunctions of water meters, reverse connection of entrances and exits, etc. A stationary failure takes a long time, and in the case of a reverse connection at the entrance/exit, the transmitter's generator does not operate, so it is difficult to distinguish it from a stationary failure.

Conventionally, if there was such a concern, it was necessary to dig up the meter (measuring section and transmitter) and inspect it, which was inconvenient.

In view of the above, the present invention incorporates a sensor that detects the rotation of the driven magnet and generates an electrical signal in a transmitter, and separately provides a checker that judges the waveform of this electrical signal, thereby preventing reverse connection of the entrance and exit of the meter. This allows discovery to be made in a short time without having to dig up the meter.

1. Configuration of the Invention Low L, Means for Solving the Problems This invention provides a driven magnet that transmits the rotation of the drive magnet of the measuring section through magnetic coupling, a tooth train that decelerates the rotation of the driven magnet, A reverse prevention mechanism provided in this tooth train, a spring that is wound up by the tooth train and stores energy, an intermittent feed mechanism that releases the energy of this spring every fixed rotation of the tooth train, and this intermittent feed. A transmitter that has a generator that is intermittently driven by a mechanism to generate unit flow rate pulses, and a receiver that is connected to the coil of the generator of this transmitter with two electric wires and is installed at a location separate from the transmitter. A remote indicating water meter comprising: a sensor for detecting the rotation of the driven magnet; and an electric signal from the sensor; the signal is shaped into a plurality of pulses for one rotation of the driven magnet; This is a reverse connection detection device for a water meter that is equipped with a checker that determines that two pulses have been received during a predetermined time and issues a reverse connection signal.

Low 21 action When the outlet downstream of the meter is fully opened and water is allowed to flow, 1 to 2 tons
When ri/h water is flowing and the water meter is connected to the pipe in the correct orientation, the driven magnet rotates relatively quickly and continuously in the positive direction. If the gear ratio is one rotation per 401, the driven magnet will be 2.4 to 1.2 at a flow rate of 1 to 2%/h.
It rotates once per minute. A sensor detects this rotation and continuously generates high-density pulses.

In addition, when the meter's inlet and outlet are reversely connected, a reversal prevention mechanism installed in the gear train that meshes with the driven magnet acts.2.When the impeller is reversed by flowing water, the driven magnet The magnet repeats reverse rotation, stop, and rapid forward rotation at the same speed as the driving magnet. Therefore, the intervals between the electrical signals generated in the sensor are such that short intervals and long intervals are adjacent to each other. By observing this with a checker, it can be confirmed that the entrance and exit are reversely connected.

Row 3. Embodiment In FIG. 1, (30) is a four-pole magnet attached to the rotating shaft (pinion) of a driven magnet (16), and a sensor (31) is attached near it to a receiving plate (17) with a mounting member (32). It is fixed. In this embodiment, a magnetoresistive element is used as the sensor (31). (33) is the sensor (31)
One of the electric wires is connected to one end of the one electric wire (22), and the other is connected to one end of a separately provided electric wire (34).

The transmission cord (35) has three electric wires (21) (22
) (34), and the terminals (28) (29) and (36) in the terminal box (25) of the receiver (24) of Figs.
) are connected to each other. Terminals (29) and (36) are female terminals (37) and (38) as shown in Figures 36 and 4.
are electrically connected to each other. This female terminal (3
7) (38) has a checker (3) as shown in Figure 2.
Plug (41) provided at the end of the two electric wires (40) in 9)
(42) is inserted and electrically connected.

The checker (39) in Fig. 2 has two plugs (41) (
42) into the female terminal of the terminal box of the receiver (24), it is electrically connected to the sensor (31) of the transmitter (14) and the electrical signal from the sensor (31) can be observed. Power switch (43), driven magnet (
16) rotates to display fluctuations in the signal from the sensor (31) and a battery checker (44) that displays the voltage of the built-in battery, an adjustment volume (45) that adjusts the signal level of the sensor (31), and , a reversal indicator lamp (46) that lights up when the meter is reversed due to reverse connection at the entrance/exit, a measurement start pushbutton switch (47), a battery check pushbutton switch (48), and the time since the start of measurement. Display (49) that displays the cumulative flow rate from the start of measurement.
). The transmitter (14) is shown in Figures 6 and 7.
As shown in the figure, a two-pole driven magnet (16) fixed to a pinion (I9) and another four-pole magnet (30) are provided, and this pinion rotates around the shaft (18) in Figure 6. It is possible to play games. (50) is the second gear that can rotate together with the second shaft (51), (52) is the second pinion, (53
) is the 3rd gear that can rotate together with the 3rd shaft (54) and the 3rd pinion (55), and (56) is the notched gear attached to the 2nd shaft (51), which plays with the 3rd shaft (54). Together with the clutch gear (57), the reverse rotation prevention mechanism (70) is configured. (58) is the 4th car 1. (59> is the 5th car,
(60) is a Zenmai shaft, and (61) is a gear attached to the shaft of the generator (20), which meshes with a pinion provided in the barrel of Zenmai (62). The forward rotation of the driven magnet is decelerated by the reduction gear train (63) consisting of the 2nd to 5th wheels, and
) to wind up all n (springs) (62). A well-known intermittent feed mechanism (71) is provided in the barrel of the fifth wheel (59) and the main shaft (60). These driven magnets (1
6) , Reduction gear train (63) , Reverse stop mechanism (70)
, Spring (Zenmai) (62), Intermittent feed mechanism (71
), the generator (20) is exactly the same as the prior art shown in FIG.

Now, when the water meter is operating normally, when the outlet downstream of the water meter is fully opened and a flow rate of 1 to 2 rrr/h flows, the driven magnet (16) rotates following the driving magnet (5). do. Assuming that the drive magnet (5) rotates once every 40β, which is the same as in the prior art shown in FIG.
) rotates once in 2.4 to 1.2 minutes. Since the magnet (30) has four poles, the resistance value of the sensor (31) changes four times during one rotation of the drive magnet (5), as shown in FIG. And since one fluctuation corresponds to 101 flow rates,
By integrating high-density electric pulses caused by changes in the resistance value of the magnetoresistive element constituting the sensor using the checker (39) described in iiJ, the integrated flow rate can be displayed with a resolution of 10β.

When the metering part (1) of the water meter has a reverse inlet/outlet connection, the impeller (2) is reversed and the drive magnet (5) is continuously reversed. The driven magnet (16) attempts to follow the drive magnet (5) and reverse rotation, but is prevented from continuing to reverse rotation because it is blocked by the reverse rotation prevention mechanism (70).

The reverse rotation prevention mechanism (70) has a notched gear (56) attached to the second shaft and a clutch gear (57) which is loosely engaged with the third shaft.
), and as shown in FIG. 9(A), the notched gear (56) has 10 teeth, and one side of each tooth is a notch. Also, the clutch gear (57) has 6 low teeth,
It consists of four tall teeth.

When the impeller (2) of the metering section (1) rotates in reverse (that is, when the inlet and outlet are reversely connected), the driving magnet (5) rotates in the reverse clockwise direction as shown in Figure 9 (A), and the driven magnet is also trying to follow suit. Also, the notched gear (56) attempts to rotate counterclockwise as shown by the dashed arrow in the figure due to the force of the spring (total n> (62), but as shown in the figure (A>), the notched gear Since the teeth (56a) of the clutch gear (57) are engaged with the teeth (57a) of the clutch gear (57) to prevent reverse rotation, the driven magnet (16) is stopped in the state shown in FIG.

In FIG. 9, for convenience of explanation, the driving magnet (5) is shown as an outer circle and the driven magnet (16) is shown as an inner circle.

Figure (B) shows how the driving magnet (5) is further reversed by 45 degrees from this state, but the driven magnet remains in the same state as shown in Figure (A) due to the action of the reversal prevention mechanism. Further, the drive magnet rotates 180 degrees (
2 rotations), the state shown in the figure (C) is reached, and after this state is slightly passed, the driving magnet (5) and the driven magnet (16) repel and attract each other, and the driven magnet (16) becomes the state shown in the figure (D). Rotate forward 180 degrees (2 rotations) to the position shown in . Therefore,
The notched gear (56) also rotates by two teeth clockwise (positive direction), and the teeth (56a) move to the illustrated position. From FIG. 9(D), until the driving magnet (5) further rotates counterclockwise by 180 degrees (5 rotations) and returns to the state shown in FIG. 9(A), the driven magnet (16) is not driven. When the magnet (5) follows the magnet (5) and rotates if it reaches the state shown in FIG. In this way, during the two rotations of the driving magnet from Figure 9 (D) to (A), the driven magnet follows the driving magnet and rotates in the opposite direction, and during the approximately half rotation from Figure 9 (A) to (C). During this period, the driven magnet stops, and the driven magnet instantaneously rotates half a turn in the normal direction in the state shown in FIG.

Therefore, when the meter is reversed due to the reverse connection of the entrance and exit, the driven magnet (16) follows the driving magnet and repeats the motion of half a rotation, opening and stopping of the driving magnet half a rotation, and instantaneous half rotation forward rotation. . At this time, the resistance of the sensor (31) changes as shown in Figure 1O, and the resistance of the sensor (31) changes as shown in Figure 1O.
Unlike the diagram, the resistance value changes intermittently.
You can determine the difference in step 9) and know that the meter is connected in reverse at the entrance and exit. In particular, the interval between the pulses occurring at t5 and t6 is constant and very short. When the water meter is connected in the correct orientation, such short pulses do not occur.

The checker (39) is the measurement start push button switch (4).
7) Pressing will reset the time and integrated flow rate display to zero.

Next, the checker's reverse rotation detection circuit will be explained.

FIG. 11 is a block diagram of a reverse rotation detection circuit of the checker, and FIG. 12 is a diagram explaining its operation. Sensor (31
) is transmitted to the checker (39) as a resistance change signal of the magnetoresistive element, and then sent to the pulse shaping circuit (72).
), each rotation of the driven magnet is shaped into a plurality of pulses. As shown in Figure 12, the signal of the resistance change of the sensor is 4 times per revolution of the driven magnet at the output of the pulse shaping circuit.
rectangular pulses. If a power generation meter with the structure shown in Figure 1 is connected to the piping in the opposite direction, when the outlet downstream of the meter is opened and water is allowed to flow at a constant flow rate, the sensor (31
) changes as shown in FIG. 12(A). (When the meter is connected in the correct direction rather than in the opposite direction, it changes as shown by the broken line.) A pulse obtained by shaping this resistance change signal by the pulse shaping circuit (72) is shown in the same figure (B).

This pulse is input to the rising edge detection circuit (73), and at the rising edge of the output pulse of the pulse shaping circuit (72), a very short rectangular pulse with a constant time width is outputted, and this short pulse is sent to the clock input terminal of the counter A (74). It is input to C. A clock signal from a clock oscillator (75) is input to the reset terminal R of the counter A (74).
Note that the period of this clock signal is t5.
The interval is set to be longer than the interval t6. When two pulses of the signal from the rising edge detection circuit (73) enter within this clock signal interval, the signal from the output terminal Q2 of the counter A (7-4) is input to the holding circuit (76) and becomes a reverse rotation detection signal.

Furthermore, in the above embodiment, the magnet (30) that acts on the magnetic resistance element (31) is a quadrupole magnet that is different from the driven magnet (16), but as shown in FIG. 16)
The magnetoresistive element (31
) can also be made to vary.

Effects of the Invention In this invention, the rotation of the driven magnet, which rotates relatively quickly, is detected by the sensor (31) such as a magnetoresistive element, and the interval between the electric signals generated by the sensor (3I) when the meter is reversely connected is unique. By paying attention to this point and using a checker to detect this and determining whether it is a reverse connection, it is possible to automatically check for a reverse connection of the meter in a short period of time.

[Brief explanation of drawings]

Figures 1 to 7 show embodiments of this invention, with Figure 1 being a longitudinal section of the measuring section and transmitter, Figure 2 being a front view of the receiver and checker, and Figures 3 and 4 being the receiver. Figure 5 is an electric circuit diagram, Figure 6 is a vertical cross-section of the transmitter gear train,
Figure 7 shows the area around the driven magnet, with (A) being a front view and (B) being a front view.
) is a longitudinal cross-sectional view, (C) is a bottom view, FIGS. 8 and 10 are diagrams showing changes in the resistance value of the sensor (magnetoresistive element), and FIG.
11 is a block diagram of a checker according to an embodiment of the present invention, FIG. 12 is a diagram illustrating the operation, and FIGS. 13 to 15 are diagrams showing the conventional technology. ,
Fig. 13 is a vertical cross section of the measuring section and the transmitter, Fig. 14 is a front view of the receiver, Fig. 15 is an electric circuit diagram, Fig. 16 shows the area around the driven magnet of another embodiment, and Fig. 14 is a front view of the receiver. ) is a longitudinal cross-sectional view, (
B) is a bottom view. (1)... Measuring part (5)... Drive magnet (14)... Transmitter (16)... Driven magnet (20)... Generator (24)... Receiver (30)...Another magnet (31)...Sensor (39)...Checker (63)...Tooth train (64)...Spring (70)...Reverse stop mechanism (71 )...Intermittent feed mechanism Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 12 Fig. 18 Fig. O

Claims (1)

[Claims] A driven magnet that transmits the rotation of the drive magnet of the measuring section through magnetic coupling, a tooth train that decelerates the rotation of this driven magnet, a reverse stop mechanism provided in this tooth train, and a magnet that is wound up by the tooth train. A transmitter having a spring that stores energy, an intermittent feed mechanism that releases the energy of the spring every fixed rotation of a gear train, and a generator that is intermittently driven by the intermittent feed mechanism to generate a unit flow rate pulse; A sensor that detects rotation of the driven magnet in a remote indicating water meter that is connected to the coil of a generator of the transmitter with two electric wires and is composed of a transmitter and a receiver installed at a remote location; Receives the electrical signal from this sensor, shapes this signal into multiple pulses for one rotation of the driven magnet, determines that two pulses have entered within a predetermined time, and generates a reverse connection signal. Water meter reverse connection detection device equipped with a checker.