JPH0321824A - Integration counter - Google Patents

Abstract

PURPOSE:To make a function recovery without replacing a fuse nor power source battery even if fixed contacts or electric conductors connected to the fixed contacts short-circuit by providing a changeover switch, an electronic circuit, and a resistance. CONSTITUTION:The changeover switch 1 has the fixed contacts A and B and a movable contact C which contacts the fixed contacts A and B alternately, and one fixed contact B is connected to the negative terminal of a power source 10. The electronic circuit 2 inputs variation in the potential of the movable contact C through its 1st input port 3 and counts and integrates the frequency of operation of the changeover switch 1. The resistance R is interposed and connected between the output port 4 of the electronic circuit 2 and the other fixed contact A of the changeover switch 1. Then the electric circuit 2 varies the potential of the output port 4 to a low potential on receiving a short-circuit detection signal indicating that the 2nd input port 5 drops to the low potential. Therefore, the battery is not consumed even when the fixed contacts A and B are held in the short-circuit state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an integration counter that is particularly useful for use in measuring instruments such as water meters.

[Prior art] A water meter equipped with a changeover switch that operates every time the metering section measures a constant flow rate and an integration counter that has a counter that counts the number of times the changeover switch is activated is known as a remote water meter. .

Figure 2 shows the electric circuit of the integration counter used in some water meters.

In FIG. 2, reference numeral 1 denotes a changeover switch that is activated every time a metering section (not shown) measures a constant flow of water, and has two fixed contacts A and B and a movable contact C. A counter 6 counts the number of times the changeover switch 1 is operated, and is connected to the changeover switch 1 through three electric wires 7, 8 and 9 as shown in the figure. 10 is a power supply battery, 11 is a fuse, 12 is a step motor, 13 is a capacitor, 14. 15 and 1
6 is a resistor, and 17 is a reed switch which is operated by the magnetic field of a permanent magnet L8.

The movable contact B of the changeover switch 1 alternates between the fixed contacts A and B.
Each time the step motor 12 comes into contact with the step motor 12, the step motor 12 advances one step at a time, and rotates a character wheel (not shown) that is interlocked with the rotating shaft of the step motor 2.

The numbers printed on the outer periphery of this letter wheel indicate the integrated value of the flow rate. The movable contact C of the changeover switch l has a twin contact structure.

[Problem that this invention attempts to solve]

In the above-mentioned conventional integration counter, the electric wires 7 and 8 connected to the fixed contacts A and B, respectively, are connected to the terminal of the battery 10 via the fuse 1l.
If there is a short circuit between the electric wires 7 and 8 due to a work error when wiring and connecting, a short circuit will occur between the terminals of the power battery 10 via the fuse 11, which will blow the fuse 11 and replace the fuse with a new one. If they were not replaced, there were problems such as the integration counter not working or the battery becoming exhausted.

In addition, the movable contact of the changeover switch 1 is twisted due to a manufacturing error, and one of the twin contacts that protects the movable contact contacts the fixed contact A and the other contacts the fixed contact B, and both fixed contacts A and There are also problems in that B becomes short-circuited through the movable contact C, causing the fuse 11 to melt and the battery to become exhausted. In this case, simply replacing the selector switch 1 with a non-defective one does not restore the function, so there is a problem in that repairs must be carried out by replacing the fuse and power supply battery with non-defective ones.

In view of the above, the present invention provides a connection between fixed contacts A and B, and between fixed contacts A and B.
The purpose of this is to propose an integration counter that can restore functionality even if the wires connected to and B are short-circuited, without requiring replacement of fuses or power batteries.

(Means for Solving the Problems) In order to achieve the above object, the integration counter of the present invention includes two fixed contacts A and B and a movable contact C that alternately contacts the fixed contacts A and B. A changeover switch 1 having one fixed contact B connected to the negative terminal of a power source 10, and an electronic circuit that inputs changes in the potential of a movable contact C to a first input port 3 and counts and integrates the number of times the changeover switch 1 is operated. 2 and
A resistor R inserted and connected between the output port 4 of the electronic circuit 2 and the other fixed contact A of the changeover switch, and a second input port 5 of the electronic circuit 2 to which the fixed contact A is connected are provided, The electronic circuit 2 is characterized in that it changes the potential of the output port 4 to a low potential upon receiving a short-circuit detection signal indicating that the potential of the second input port 5 has become low (claim 1).

It is effective to provide a display 2o that displays the integrated value counted by the electronic circuit 2 and the fact that a short circuit has occurred due to a short detection signal indicating that the potential of the second input port 5 has become low (
Claim 2).

It is effective if the electronic circuit 2 assembles the counted and integrated value and the information that the short circuit has occurred into a telegram and outputs it (
Claim 3).

The electronic circuit 2 receives the short detection signal and outputs the output port 4.
After reducing the potential to a low potential, check for short circuits by returning the first output port 4 to a high potential for short periods at regular intervals, and if there is no short circuit, continuing to increase the potential of the output port 4 to a high potential will be effective. (Claim 4).

[Effect]

In the integration counter configured as described above, a high potential is normally applied from the output port 4 of the electronic circuit 2 to the fixed contact A via the resistor R. When the movable contact C alternately switches between fixed contacts A and B for each constant flow rate and contacts them, the potential of the movable contact C alternately switches high and low, and this change is reflected in the first input port 3 of the electronic circuit 2. The electronic circuit 2 counts and integrates the flow rate. If the fixed contacts A and B are short-circuited, the potential of the fixed contact A becomes low, and the short-circuit is sent to the second manual port of the electronic circuit 2 as a short-circuit detection signal. Since the electronic circuit 2 receives this input signal and changes the potential of the output port 4 to a low potential, the battery will not be consumed even if the fixed contacts A and B are short-circuited.

The display 20 displays the integrated value and the fact that there is a short circuit.

In the case where the electronic circuit 2 assembles the integrated value and short information into a telegram and outputs it, short information is also output at the same time as automatic meter reading information is output to a remote location.

In the structure of claim 4, short-circuit detection is repeated at fixed time intervals, and if the short circuit is lost during the process, recovery is automatically performed.

〔Example〕

In FIG. 1, 1 is a changeover switch, which consists of a fixed contact AB and a movable contact C, and has three electric wires 7, 8 and 9 connected to a counter 6.
connected with. 2 is an electronic circuit using a microcomputer. 3 is the first input port, 4 is the output port, 5 is the second manual port, 20 is the display, 2
1 is a message (human) output interface, 22 is a third human power port, 23 is a second output port, and 10 is a power source, which are connected as shown in the figure.

The output port 4 of the electronic circuit 2 is always kept at a high potential, and a high potential is applied to the fixed contact A of the changeover switch 1 via a resistor R. When the movable contact C alternately contacts the fixed contacts A and B, the change in potential is input to the first input port 3, counted and integrated by the electronic circuit 2, and displayed on the display 20. If fixed contacts A and B are short-circuited due to some trouble, fixed contact A will continue to have a low potential, which will be input to the second input port 5, and the electronic circuit 2 will recognize the occurrence of a short-circuit and This is displayed on the display 2o.

The electronic circuit 2 receives a short circuit detection signal indicating that the second input port is at a low potential, sets the output port 4 to a low potential, and then returns the output port 4 to a high potential for short periods at regular time intervals to check whether there is a short circuit. It is equipped with a program that checks the short-circuit and continues to set output port 4 to a high potential if there is no longer a short circuit.

Further, the electronic circuit 2 includes a program that assembles and outputs the integrated value and short circuit information into a telegram, and outputs this telegram to a communication transmission line via a telegram (human) output interface 21.

[Effects of the Invention] Since the present invention is structured as described above, it produces the effects described below.

With the configuration of claim 1, even if there is a short circuit between the fixed contacts A and B or between the electric wires 7 and 8 that are to be connected to these contacts,
Since the current is limited by the resistor R, an excessive current will not flow. This prevents fuse blowouts and rapid battery consumption. Furthermore, since the occurrence of a seat is determined and the voltage applied to the fixed contact A is lowered, the battery will not be consumed even if the seat phenomenon continues.

In addition, since the fact of a short circuit can be displayed on the display, it is possible to easily recognize that a short circuit has occurred, and to take prompt countermeasures (Claim 2). Since it is output in the form of a telegram, it is possible to know the occurrence of a problem with Shirat at the same time as automatic meter reading (Claim 3)
).

In addition, after receiving a short detection signal and setting the output port to a low potential, the output port is returned to a high potential for short periods at regular intervals to check for a short circuit, and when the short circuit disappears, the output port is continued to be set to a high potential. Since the voltage is set to a potential, there is an effect that the normal operation is automatically restored as soon as the short-circuit phenomenon is recovered (Claim 4).

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of a conventional example. DESCRIPTION OF SYMBOLS 1... Selector switch, 2... Electronic circuit, 3... First input port, 4... Output port, 5... Second input port, 10... Power supply, 2o...・Indicator, A,
B...Fixed contact, C...Movable contact, R...Resistance

Claims (1)

[Claims] 1. Two fixed contacts (A), (B) and this fixed contact (A
), (B) and movable contacts (C) that alternately contact each other, and one fixed contact (B) connected to the negative terminal of the power source (10), and the movable contact (C). The change in potential is taken into the first input port (3) and the changeover switch (1
); and a resistor (R) inserted and connected between the output port (4) of the electronic circuit (2) and the other fixed contact (A) of the changeover switch. )
and a second input port (5) of an electronic circuit (2) to which the fixed contact (A) is connected, and the electronic circuit (2) has a second input port (5) at a low potential. An integrating counter that changes the potential of an output port (4) to a low potential in response to a short detection signal. 2. Claim 1, further comprising a display device (20) that displays the integrated value counted by the electronic circuit (2) and the fact of a short circuit caused by a short detection signal indicating that the second input port (5) has become low in potential. Integration counter listed. 3. Claim 1, wherein the electronic circuit (2) assembles the counted and integrated value and the information that the short circuit has occurred into a telegram and outputs the same.
Or the integration counter described in 2. 4. The electronic circuit (2) sets the output port (4) to a low potential in response to the low potential of the second input port (5), and then shortens the output port (4) at regular time intervals. 4. The integrating counter according to claim 1, wherein the potential is returned to a high potential at intervals of time to check for the presence of a short circuit, and if the short circuit is eliminated, the output port (4) is continuously set to a high potential.