JPH0338655Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial application field This invention relates to an improvement of a power-generating water meter that provides remote instructions.

B. Prior Art The transmitter of a power-generating water meter is buried underground together with the measuring section, and is connected to a receiver installed at a remote location by two electric wires. The electric pulse from the transmitter is a unit flow rate pulse of 1 m ³ /pulse.

In FIG. 11, reference numeral 1 denotes a metering section, in which an impeller 2 is rotatably supported in a fluid passage, and a reduction gear train 3
The pointer 4 is driven through the magnet, and the driving magnet 5 forming the magnetic coupling is rotated.

Water enters from the inlet 6, rotates the impeller 2, and flows downstream from the outlet 7. 8 is a dial plate, 9 is a glass, 10 is a transmitter attachment member fixed to the center of the glass 9, 11 is a nut for fixing the member 10 to the glass 9, and 12 is a nut 11 and a washer 13 that are attached to the glass 9. It is a leaf spring fixed in the center of.

The drive magnet 5 shown in this figure is magnetized into two poles in the diametrical direction, and the gear ratio of the reduction gear train 3 is determined so that it rotates once per 40 degrees of flow rate of water.

Reference numeral 14 denotes a transmitter, which has a case having a generally cylindrical shape as a whole, a lower end protrusion 15 of the case fits into the recess at the center of the transmitter mounting member 10, and the leaf spring 12 is inserted into a groove on the outer periphery of the case. By engaging,
A transmitter 14 is mounted and fixed on the upper part of the measuring section 1. Reference numeral 16 denotes a driven magnet fixed to a pinion 19 rotatably engaged with a fixed shaft 18 of the lower base plate 17 of the transmitter 14, forming a magnetic coupling with the driving magnet 5, and transmitting the rotation of the measuring section 1. It is transmitted to the container 14, which rotates at a speed of one revolution every 40 measurements.
The transmitter 14 is connected to a generator 20 and, as will be described later,
A tooth train that decelerates the rotation of the driven magnet 16, a reverse stop mechanism provided in this tooth train, and a spring that is wound up by the tooth train and stores energy.
It has an intermittent feeding mechanism that intermittently drives the generator 20 by discharging the energy of this spring every fixed rotation of the gear train, and connects two electric wires each connected at one end to the coil of the generator 20. Electrical pulses (unit flow rate pulses) are transmitted to a receiver 24 in FIG. 12 by means of a transmission cord 23. Transmission code 2
The two electric wires No. 3 are connected to a coil of a pulse motor (not shown) of the receiver 24 within 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 m ³ units.

In the conventional transmitter 14 and receiver 24, as shown in FIG. The terminals 28 and 29 in the terminal box of the receiver 24 are connected to the receiver 24 in a removable manner.

C. Problems to be solved by the present invention In the above-mentioned conventional power-generating water meter, the measuring section 1 and the transmitter 14 are buried underground. I was visually checking the progress. However,
Even if the water outlet downstream of the meter is fully opened and water flows at a rate of 1 to 2 m ³ /h, it will continue to flow for 30 minutes to 1 hour, and only one pulse will advance.
It takes too much time and is not practical.

The same applies to checking for permanent malfunctions of water meters, reverse connection of entrances and exits, and the discovery of water leaks downstream of water meters. 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. In addition, water leakage downstream of the water meter is caused by the slight rotation of the water meter.
It takes an extremely long time for the receiver to work, making detection impossible.

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, this invention incorporates a means for generating high-density electric pulses in response to the rotation of the driven magnet, and adds one electric wire to the transmission cord to make it possible to use three electric wires, which were not conventional. Both the unit flow rate pulse of To enable reverse connection of inlets and outlets, detection of water leakage downstream of a meter, etc. in a short time without digging up the meter.

D. Means for solving the problem This invention consists of a driven magnet that transmits the rotation of the drive magnet of the measuring section by magnetic coupling, a tooth train that decelerates the rotation of this driven magnet, and a tooth train that is installed in this tooth train. a spring that is wound up by a tooth train and stores energy; an intermittent feed mechanism that releases the energy of this spring every fixed rotation of the tooth train; and an intermittent feed mechanism that is driven intermittently to produce a unit flow rate. A remote indicating water meter consisting of a transmitter having a generator that generates pulses, and a receiver that is connected to the coil of the generator of the transmitter with two electric wires and is installed at a remote location from the transmitter. And,
A magnetoresistive element is arranged in the receiver in close proximity to the driven magnet or another magnet provided on the rotating shaft of the driven magnet, and one terminal of this magnetoresistive element is connected to one of the two electric wires in the transmitter. Connect to one electric wire, connect to one electric wire separately provided at the other terminal and extend to the receiver, and connect each end of one electric wire separate from the one electric wire to the receiver. It is characterized by the provision of two connected terminals for external connection.

E. Effect If you fully open the water outlet downstream of the meter and let water flow, 1
~2 m ³ /h of water flows, and the driven magnet continuously rotates relatively quickly in the positive direction. 40 at a flow rate of 1-2 m ³ /h
If the gear ratio is one rotation per rotation, the driven magnet will be 1.2
Since it rotates once every ~2.4 minutes, if the magnet that activates the magnetoresistive element is magnetized to four poles, the resistance value of the magnetoresistive element changes every 0.3 to 0.6 minutes, generating high-density pulses. By observing this pulse by connecting a checker to the receiver terminal, you can determine whether the meter is normal or not. (High-density pulses will not occur in the case of an immobile failure.) Also, 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 is activated, so the water cannot flow. When the impeller is reversed, the driven magnet repeats normal rotation → stop → reverse rotation as described later. Therefore, the resistance value of the magnetoresistive element repeats the process of change → constant → change.

By observing this with a suitable checker connected to the terminal of the receiver, it can be confirmed that the entrance and exit are reversely connected.

In addition, in the event of a water leak, even if the downstream door is fully closed, the driven magnet will rotate continuously, so it will be possible to receive information on how many times the resistance value of the magnetic resistance element changes over a certain period of time. Observe with a checker connected to the terminal of the device,
You can know the extent of the leak.

F. Example In FIG. 1, 30 is a quadrupole magnet attached to the rotating shaft (pinion) of the driven magnet 16, and a magnetic resistance element 31 is attached near the lower base plate 17 with a mounting member 32.
is fixed to. 33 is an electric wire connected to the magnetoresistive element 31, one of which is connected to one end of the one electric wire 22, and the other is connected to one end of a separate electric wire 34. The transmission cord 35 has three electric wires 21, 22, 34, and the terminals 28, 29 and 3 in the terminal box 25 of the receiver 24 shown in FIGS. 2 to 5.
6, respectively. Terminals 29 and 36 are the third
As shown in the figure, they are electrically connected to female terminals 37 and 38, respectively. These female terminals 37 and 38 have two electric wires 4 of a checker 39 as shown in FIG.
Plugs 41 and 42 provided at the ends of the 0 are 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 magnetoresistive element 31 of the transmitter 14, and changes in the electrical resistance value of the magnetoresistive element 31 can be observed. Yes, the power switch 43 and the driven magnet 16 rotate and the magnetic resistance element 3
A battery checker 44 that displays changes in the resistance value of 1 and the voltage of the built-in battery, an adjustment volume 45 that adjusts the change level of the magnetoresistive element 31, and lights up when the meter is reversed due to reverse connection of the entrance and exit. A reversal indicator lamp 46, a measurement start pushbutton switch 47, a battery check pushbutton switch 48, and a display 49 for displaying the time from the start of measurement and the cumulative flow rate since the start of measurement are provided. As shown in FIGS. 6 and 7, the transmitter 14 is provided with a two-pole driven magnet 16 fixed to a pinion 19 and another four-pole magnet 30, and this pinion is connected to the shaft 18 in FIG. It is rotatably engaged.

50 is a second gear rotatable together with the second shaft 51; 52 is a second pinion; 53 is a third gear rotatable together with the third shaft 54 and third pinion 55;
Reference numeral 6 denotes a notched gear attached to the second shaft 51, and together with a clutch gear 57 loosely engaged with the third shaft 54, the reverse rotation prevention mechanism 70 is constituted.

58 is the 4th wheel, 59 is the 5th wheel, 60 is the full axis,
61 is a gear attached to the shaft of the generator 20, which meshes with a pinion provided on the barrel of Zenmai 62. The forward rotation of the driven magnet is decelerated by a reduction gear train 63 consisting of the second to fifth wheels, and winds up the spring 62 of the full-speed shaft 60 . 5th wheel 59 and full axle 60
A well-known intermittent feed mechanism 71 is provided in the barrel. These driven magnets 16, reduction gear train 63,
The anti-reverse mechanism 70, the spring (zentai) 62, the intermittent feed mechanism 71, and the generator 20 are exactly the same as those in the prior art shown in FIG.

Now, when the water meter is operating normally, when the downstream port of the water meter is fully opened and a flow rate of 1 to 2 m ³ /h is allowed to flow, the driven magnet 16 rotates following the driving magnet. Assuming that the drive magnet 5 rotates once every 40 degrees as in the prior art shown in FIG. 11, the drive magnet 5 rotates once every 2.4 minutes to 1.2 minutes. magnet 30
Since there are four poles, the resistance value of the magnetic resistance element 31 during one rotation of the drive magnet 5 is as shown in FIG.
It fluctuates 4 times. Since one fluctuation corresponds to 10 degrees of flow rate, if the checker 39 integrates the high-density electric pulses caused by changes in the resistance value of the magnetoresistive element, the integrated flow rate can be displayed with a resolution of 10 degrees.

When the metering part 1 of the water meter has the inlet and outlet reversely connected, the impeller 2 is reversed and the drive magnet 5 is continuously reversed. The driven magnet 16 tries to follow the driving magnet 5 and rotate in reverse, but is prevented from rotating in the reverse direction continuously because it is blocked by the reverse rotation prevention mechanism 70.

The reverse prevention mechanism 70 is composed of a notched gear 56 attached to the second shaft and a clutch gear 57 loosely engaged with the third shaft.As shown in FIG. 9A, the notched gear 56 has 10 teeth. , with one side of each tooth cut out. Further, the clutch gear 57 consists of six low teeth and four high teeth.

When the impeller 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 FIG. 9A, and the driven magnet follows this and rotates in the reverse direction. shall be. Also, the notched gear 56 tries to rotate counterclockwise as shown by the dashed arrow in the figure due to the force of the spring (full swing) 62, but as shown in FIG.
a is engaged with the teeth 57a of the clutch gear 57 to prevent reverse rotation, so 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. The drive magnet further rotates, and from the state of A in the same figure it becomes 180 degrees.
degree (1/2 rotation), it becomes the state shown in figure C, and after this state, the driving magnet 5 and the driven magnet 1
6 are repelled and attracted to each other, and the driven magnet 16 is
Rotate forward 180 degrees (1/2 turn) to the position shown. Therefore, the notched gear 56 also rotates by two teeth clockwise (positive direction), and the teeth 56a move to the illustrated position. From this FIG. 9D, it can be seen that the driving magnet 5 is further 180
The driven magnet 16 rotates following the drive magnet 5 until it rotates 1/2 degree (1/2 turn) and returns to the state shown in A in the figure. When the state shown in A in the figure is reached, the reverse stop mechanism 70 is activated. Then, the driven magnet 16 stops. In this way, during the 1/2 rotation of the driving magnet from D to A in Figure 9, the driven magnet rotates following the driving magnet, and during the approximately half rotation from A to C in the same figure, the driven magnet stops. death,
In the state shown in figure D, the driven magnet momentarily reverses itself half a turn repeatedly.

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 following motion: reversal for half a turn → stop for half a rotation of the driving magnet → reversal for half a rotation instantaneously. . At this time,
The resistance of the magnetoresistive element 31 changes as shown in Fig. 10, and differs from Fig. 8 when the meter is operating normally.
Since the resistance value changes intermittently, the checker 39 can determine the difference and know that the meter is connected in reverse at the entrance and exit.

Note that when the checker 39 presses the measurement start push button switch 47, the display of time and integrated flow rate is reset to zero.

In the above embodiment, the magnet 30 acting on the magnetic resistance element 31 is a quadrupole magnet separate from the driven magnet 16, but as shown in FIG.
It is also possible to make the magnetoresistive element 31 large in size and have four poles so that the resistance value of the magnetoresistive element 31 changes with this magnetic field.

G. Effect of the invention According to this invention, when the entrance and exit of the meter are connected in reverse by mistake, the reversing mechanism in the tooth train of the transmitter and the magnetic coupling between the driving magnet of the measuring section and the driven magnet of the transmitter Due to this action, the driven magnet repeats normal rotation → stop → reverse rotation, so the resistance value of the magnetic resistance element repeats the process of changing → constant → changing.

Therefore, by connecting the checker 39 to the checker connection terminal of the receiver as necessary, it is possible to quickly observe meter failures, reverse connections at the entrance and exit, water leaks downstream of the meter, etc. In addition, since the rotation of the driven magnet, which rotates relatively quickly, is detected by the magnetoresistive element 31, it is possible to generate high-density pulses with a small detection element, and there are only three wires to the receiver. Even when the checker is connected, the pulse motor of the receiver operates normally without adversely affecting the operation.

[Brief explanation of the drawing]

Figures 1 to 7 show examples 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 electrical circuit diagram, Figure 6 is a vertical cross-section of the transmitter gear train, and Figure 7 is a diagram around the driven magnet, where A is a top view and B is a vertical cross-section. Figures C is a bottom view, Figures 8 and 10 are diagrams showing changes in the resistance value of the magnetoresistive element, Figure 9 is a diagram explaining the operation of the reverse stop mechanism, and Figures 11 to 13 are conventional techniques. Fig. 11 is a vertical cross section of the measuring section and transmitter, Fig. 12 is a front view of the receiver, Fig. 13 is an electric circuit diagram, and Fig. 14 shows the area around the driven magnet of another embodiment. A is a longitudinal sectional view, and B is a bottom view. DESCRIPTION OF SYMBOLS 1... Measuring part, 5... Drive magnet, 14... Transmitter, 16... Driven magnet, 20... Generator, 21,
22...Electric wire, 24...Receiver, 30...Another magnet, 31...Magnetic resistance element, 63...Tooth gear train, 6
4... Spring (zenmai), 70... Reverse stop mechanism, 72... Intermittent feed mechanism, 37, 38... Terminal.

Claims (1)

[Scope of utility model registration request] 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; This transmitter is connected to the generator coil with two wires,
A remote indicating water meter consisting of a transmitter and a receiver installed at a remote location, wherein a magnetoresistive element is placed in the receiver in close proximity to the driven magnet or another magnet provided on the rotating shaft of the driven magnet. one terminal of this magnetoresistive element is connected to one of the two electric wires in the transmitter, and the other terminal is connected to a separate electric wire to reach the receiver. The receiver has two wires for external connection connected to each end of a wire provided separately from the one wire.
A power-generating water meter characterized by having multiple terminals.