JPH0515061Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention A-1. Field of Industrial Application This invention relates to an improvement of a power-generating water meter that provides remote instructions.

A-2 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. 4, reference numeral 1 denotes a metering unit, and an impeller 2 is rotatably supported in a fluid passage, and drives a pointer 4 via a reduction gear train 3, and also rotates a drive magnet 5 forming a magnetic coupling. let

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 mounting member fixed to the center of the glass 9, 11 is a nut for fixing the member 10 to the glass 9, 12 is a nut 11 and a gasket 13
This is a leaf spring fixed to the center of the glass 9 with.
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. 1
Reference numeral 4 denotes a transmitter, which has a case having a substantially cylindrical shape as a whole, the 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 the groove on the outer periphery of the case. By engaging, the transmitter 14 is attached and fixed to the upper part of the measuring section 1. 1
6 is a shaft 18 fixed to the lower base plate 17 of the transmitter 14
A driven magnet fixed to a pinion 19 rotatably engaged with the drive magnet 5 forms a magnetic coupling with the drive magnet 5, transmits the rotation of the measuring section 1 to the transmitter 14, and transmits the rotation of the measuring section 1 to the transmitter 14.
It rotates at the speed of one rotation each time it is weighed. The transmitter 14 is wound up by a generator 20, a tooth train that decelerates the rotation of the driven magnet 16, a reverse stop mechanism 70 provided in this tooth train, and a tooth train 63, as will be described later. Spring 6 that stores energy
2, and an intermittent feeding mechanism 71 that intermittently drives the generator 20 by discharging the energy of the spring 62 every fixed rotation of the tooth train 63, and one end of each is connected to the coil of the generator 20. Electric pulses (unit flow rate pulses) are transmitted to a receiver 24 in FIG. 5 through a transmission cord 23 having two electric wires. The two wires of the transmission cord 23 are connected to the receiver 2.
4 is connected to the coil of a pulse motor (not shown) of the receiver 24. The pulse motor advances each time it receives the unit flow rate pulse and rotates the display number wheel 26, which displays the integrated flow rate in m ³ units.

As shown in FIG. 6, the transmitter 14 and the receiver 24 are electrically connected to a generator coil 27 and a pulse motor coil 27' by a transmission cord 23 having two electric wires 21 and 22 for reception. The terminals 28 and 29 in the terminal box of the device 24 are removably connected.

In the above-mentioned conventional power-generating water meter, the measuring unit 1 and the transmitter 14 are buried underground, so the meter's operation can be checked by visually checking that the display on the receiver 24 advances every unit flow rate pulse. Ta. 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 fixed malfunctions of water meters, reverse connection of entrances and exits, etc. Therefore, it takes a long time to check for a stationary failure, and in the case of a reverse connection at the entrance/exit, it is difficult to distinguish it from a stationary failure because the transmitter's generator does not operate. Conventionally, when such a concept existed, it was necessary to dig up the meter (measuring section and transmitter) and inspect it, which was inconvenient.

In view of the above, the applicant has incorporated a means for generating high-density electric pulses in accordance with the rotation of the driven magnet into the transmitter, added one electric wire to the transmission cord, and used three electric wires. Both the conventional unit flow rate pulse and the high-density pulse are transmitted to the receiver, and by installing an appropriate checker on the receiver and connecting the terminal, the presence or absence of the high-density pulse can be determined. We proposed a power-generating water meter that allows for reverse connections and detection of water leaks downstream of the meter in a short period of time without having to dig up the meter.

This power-generating water meter was invented in 1983.
It is described in No. 119020, and its contents are described below.

In FIG. 7, reference numeral 30 denotes a quadrupole magnet fixed on the driven magnet 16, and is attached to the rotating shaft (pinion) 19. Nearby is a magnetoresistive element 3.
1 is fixed to the lower base plate 17 with a mounting member 32. 33 is an electric wire connected to the magnetoresistive element 31;
One of the electric wires 22 is connected to one end, and the other electric wire is connected to one end of a separately provided electric wire 34. The transmission cord 35 has three electric wires 21, 2
2, 34, and the receiver 24 of FIGS.
are connected to terminals 28, 29 and 36 in the terminal box 25, respectively. Terminals 29 and 36 are shown in Figures 9 and 10.
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. 8 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. There is a power switch 43, a battery checker 44 that displays the voltage of the built-in battery, an operation indicator lamp 45 that flashes each time the driven magnet 16 rotates and the resistance value of the magnetoresistive element 31 changes, and a meter that is reversed by reverse connection of the entrance and exit. a reversal indicator lamp 46 that lights up when the clock is on, a measurement start pushbutton switch 47, a battery check pushbutton switch 48, and the time since the start of measurement.
Display device 49 that displays the cumulative flow rate from the start of measurement
It is equipped with

As shown in FIG. 12, the transmitter 14 is provided with a two-pole driven magnet 16 fixed to a pinion 19 and another four-pole magnet 30.
It is rotatably coupled to a shaft 18 in the figure.

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, and meshes with a pinion provided in the number box of the spring (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 spring shaft 60. 5
A well-known intermittent feed mechanism 71 is provided in the number box of the number wheel 59 and the feeling shaft 60. These driven magnets 16, reduction gear train 63, and reverse stop mechanism 7
0, Spring (zenmai) 62, Intermittent feed mechanism 7
1. The generator 20 is exactly the same as 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 follows the driving magnet 5 and rotates. The rotation of the driving magnet 5 is the same as in Fig. 4.
Assuming that it rotates once every 40°, the driving magnet 5 is
One rotation takes 2.4 minutes to 1.2 minutes. Since the magnet 30 has four poles, the resistance value of the magnetoresistive element 31 changes four times during one rotation of the drive magnet 5, as shown in FIG. 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. 15A, 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. 15A, 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 broken line 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.

Note that in FIG. 15, for convenience of explanation, the drive magnet 5
is shown in the outer circle, and the driven magnet 16 is shown in the 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 repulse and absorb each other, and the driven magnet 16
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 Fig. 15, the driven magnet rotates following the driving magnet, and as shown in Fig.
During approximately half a rotation from C to C, the driven magnet stops, and in the state shown in D in the same figure, the driven magnet momentarily reverses by half a rotation, which is repeated.

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. 16, 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.

The magnet 30 that acts on the magnetic resistance element 31 is not a 4-pole magnet separate from the driven magnet 16, but the magnetically coupled driven magnet 16 is made large and has 4 poles, as shown in FIG. It is also described in Utility Model Application No. 119020/1989 that the resistance value of the resistive element 31 changes.

E-3 Problems to be Solved by the Present Invention The conventional technology shown in Figures 4 to 6 requires that the meter (measuring unit and transmitter) be dug out if there is a concern about the meter's fixed failure or reverse connection at the entrance/exit. It was inconvenient as it was necessary to inspect the

In addition, in the conventional technology shown in FIGS. 7 to 17, by connecting a checker 39 to the checker connection terminal of the receiver as necessary, problems such as fixed meter failure, reverse connection of the entrance and exit, water leakage downstream of the meter, etc. can be prevented. However, since it requires three wires to connect the transmitter and receiver, there is a problem in that the wiring costs are high and the cost is high.

In view of the above, this invention is a checker that can quickly observe problems such as fixed meter failures, reverse connections at the entrance/exit, and water leaks downstream of the meter by connecting it to the transmission line on the receiver side. The purpose is to propose a power-generating water meter that requires only two wires between the receiver and the receiver.

B. Structure of the invention B-1. Means for solving the problems In order to solve the above-mentioned problems, the present invention provides a driven magnet that transmits the rotation of the drive magnet of the measuring section through magnetic coupling, and a rotation of the driven magnet. a gear train that decelerates the
A reverse prevention mechanism provided in this tooth train, a spring that is wound up by the tooth train and stores energy, an intermittent mechanism that releases the energy of this spring every fixed rotation of the tooth train, and this intermittent feed mechanism. A remote-instruction type water supply system consisting of a generator that is driven intermittently to generate a unit flow rate pulse, and a receiver that is connected to the coil of the transmitter's generator with two electric wires and is installed at a remote location from the transmitter. In the meter, a contact switch is disposed close to the driven magnet or another magnet provided on the rotating shaft of the driven magnet,
This contact switch has a switching contact, and one of the two fixed contacts connected in common and the movable contact is connected to one end of the coil, and the other is connected to one of the two electric wires. Accordingly, the coil is connected in series to the two electric wires via this contact switch.

RO-2 Operation When checking the meter, connect a checker to the receiver terminals and measure the resistance between the terminals.

A contact switch operates as the driven magnet rotates, and during switching, there are times when the movable contact is not in contact with either fixed contact for a very short period of time.

This time is usually less than mS, but this phenomenon can be observed with a checker and from the interval it can be determined whether the meter is normal or not.

RO-3 EMBODIMENT In the embodiments shown in FIGS. 1 to 3, elements that perform the same mechanism as in the prior art described above are given the same reference numerals.

Further, explanations regarding these elements will be omitted.

Note that an embodiment using a reed switch will be shown as an example of a contact switch.

In this embodiment, a reed switch 72 is disposed close to the magnet 30 provided on the rotating shaft of the driven magnet 16, and as shown in FIG. 21, 22
inserted between one of the two. Fixed contacts 74 and 75 of the reed switch are commonly connected to the electric wire 21. Movable contact 73 is connected to coil 27 .

The reed switch 72 and the magnet 30 are arranged in the relationship shown in Fig. 3, and since the magnet is magnetized into four poles as shown in the figure, during one rotation, the movable contact (reed) 73 of the reed switch The contact (normally open) 74 and the other fixed contact (normally closed) 75 are contacted four times each, but when switching from one fixed contact to the other, the movable contact contacts only for a very short time. is far from any fixed contact.

This opportunity occurs eight times at equal intervals during one rotation of the magnet 30.

If this phenomenon is observed with a checker, eight high-density pulses can be obtained per one rotation of the magnet 30.

An example of a circuit provided in the checker 39 for this purpose is shown in FIG. The generator coil 27 and the receiver coil 27' are connected as shown by a reed switch 72, and a resistor R ₁ in the checker is connected so that both ends of the coil 27' form one side of the checker's bridge circuit. , R ₂ , and R ₂ . resistance
The value of R ₂ is set to be the same as the resistance of the parallel connection of coils 27 and 27' to balance the bridge. A DC voltage for measurement is applied to the terminal 76, and the unbalanced voltage of the bridge is amplified by the operational amplifier OP and converted into a pulse. An unbalanced pulse occurs when the contacts of a reed switch open at the time of switching. This is the magnet 30 as mentioned above.
When the meter is normal and rotating at a constant speed, the pulse interval is constant. When the meter is rotating in the opposite direction due to the reverse connection of the entrance and exit, the driven magnet 16 repeats reciprocating rotation as explained in FIG. Since the motor performs an intermittent operation in which no pulse is generated, reversal can also be checked by recognizing this characteristic with a checker. You can also check for water leaks.

In order to connect the checker 39, female terminals 76 and 77 that are electrically connected to the electric wires 21 and 22 are provided in the terminal box of the receiver as shown in FIGS. Insert the male terminal provided on the cord to make an electrical connection.

C. Effects of the invention According to this invention, the connection between the transmitter and the receiver requires only two wires, and since a checker is provided, the meter can be easily checked. In other words, this invention uses a checker to detect the pulse at the time of instantaneous switching of the contact in a switch equipped with a contact switch, so when the meter is rotating in the reverse direction due to reverse connection of the entrance and exit, the driven magnet 16 repeats reciprocating rotation. As a result, the reed switch performs an intermittent operation, emitting pulses at short intervals or not emitting pulses during half a rotation of the magnet, so by recognizing these characteristics with a checker, reversal can also be checked. It also has the advantage of being able to check for water leaks.

[Brief explanation of the drawing]

Figures 1 to 3 show examples of this invention, with Figure 1 being an electric circuit diagram, Figure 2 being a longitudinal section of the measuring section and transmitter, and Figure 3 being the arrangement of the magnet 30 and the reed switch. FIGS. 4 to 17 show the prior art, FIG. 4 is a longitudinal section of the measuring section and transmitter, and FIG.
The figure is a front view of the receiver, Figure 6 is an electrical circuit diagram, and Figure 7 is a front view of the receiver.
The figure shows a longitudinal section of the measuring section and transmitter, Fig. 8 is a front view of the receiver and checker, Figs. 9 and 10 are longitudinal sections of the terminal box of the receiver, Fig. 11 is an electric circuit diagram, and Fig. 12
The figure shows the area around the driven magnet, with A being a top view and B being a top view.
is a longitudinal cross-sectional view, C is a bottom view, Fig. 13 is a longitudinal cross-section of the transmitter gear train developed, Figs. 14 and 16 are diagrams showing changes in the resistance value of the magnetoresistive element, and Fig. 15 is a diagram showing changes in the resistance value of the magnetoresistive element. Figure 17 is a diagram explaining the operation of the anti-reverse mechanism; Figure 17 shows the area around the driven magnet; Figure A is a vertical sectional view; Figure B is a bottom view; Figure 18 is a circuit diagram of the checker; Figure 19A is
is a vertical sectional view of the receiver terminal box section, Fig. 19B
is a sectional view taken along line BB in FIG. 19A. DESCRIPTION OF SYMBOLS 1... Measuring part, 5... Drive magnet, 14... Transmitter, 16... Driven magnet, 20... Generator, 21,
22...Electric wire, 24...Receiver, 27...Coil, 30...Another magnet, 63...Tooth gear train, 64...
...Spring (zenmai), 70...Reverse prevention mechanism,
71... Intermittent feed mechanism, 72... Reed switch, 73... Movable contact, 74, 75... Fixed contact.

Claims (1)

[Scope of utility model registration request] A driven magnet 16 that transmits the rotation of the drive magnet 5 of the measuring section 1 through magnetic coupling, a tooth train 63 that decelerates the rotation of the driven magnet 16, and a reverse rotation prevention mechanism 70 provided in the tooth train 63. A spring 62 is wound around the tooth train 63 to store energy, an intermittent feed mechanism 71 releases the energy of the spring 62 every fixed rotation of the tooth train 63, and the intermittent feed mechanism 71 is intermittently driven to produce a unit flow rate. a generator 20 that generates pulses;
The remote indicating water meter is connected to the coil 27 of the generator 20 of the transmitter 14 by two electric wires 21 and 22, and is composed of the transmitter 14 and a receiver 24 installed at a remote location. Driven magnet 16
Alternatively, a contact switch is disposed on another magnet 30 provided on the rotating shaft of the driven magnet, and this contact switch has a switching contact 72, and the two fixed contacts 7
4 and 75 connected in common, and one of the movable contacts 73 is connected to one end of the coil 27, and the other to one of the two electric wires, the coil is connected via the contact switch 72. 27 are connected in series to the two electric wires 21 and 22, and a receiver coil 27' is provided on the receiver side, as well as a checker 39 connected to the two electric wires. meter.