JP3074892B2 - Flow rate integration display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate integrating display device used for an electronic gas meter or the like for electronically displaying an integrated value of gas using a liquid crystal display.

[0002]

2. Description of the Related Art In recent years, in order to prevent an explosion accident due to gas leakage or a fire accident due to forgetting to turn off gas appliances, a gas meter with a safety function that monitors the gas flow rate by installing a microcomputer in the gas meter, and an automatic meter reading system Corresponding gas meters are emerging. Since these gas meters integrate the flow rate by a built-in electronic device, the integrated display is being performed by a liquid crystal display.

[0003] Such a conventional flow rate integrating display device is shown and described in FIG. In FIG. 2, 1 is an outdoor pipe on the gas supply side, 2 is an outdoor pipe on the gas use side, 3
Is a flow rate measuring means connected to the indoor and outdoor pipes 1 and 2, 4 is an integrating means, and 5 is a display means. And 3, 4, 5
6 is a gas meter.

[0004] The operation of the flow rate integrating display device having the above-described configuration will be described with reference to FIG. The flow rate flowing through the gas pipe 2 is measured by the flow rate measuring means 3. The output of the flow rate measuring means 3 generates a pulse output corresponding to the flow rate value. The integrating means 4 adds the gas volume per pulse to the stored integrated value each time an output pulse is generated from the flow rate measuring means 3. Then, the integrated value is displayed on display means 5 composed of liquid crystal.

[0005]

As described above, in the conventional configuration, noise such as a lightning surge is applied to the integrating means 4,
It is conceivable that the integrated value of the integrating means 4 becomes a random value. Therefore, there were the following problems.

(1) When the integrated value becomes zero or becomes extremely large, a person can judge that there is an error at the time of meter reading. In this case, the gas supplier determines the current meter reading from the previous meter reading. Gas consumption by time cannot be collected from gas users.

(2) At the time of meter reading, it is often difficult to determine whether an error has occurred. In this case, a question is raised to the gas user that the actual state of gas use and the fee are sensuously strange, and distrust of the gas supplier is increased.

The present invention has been made to solve the above-mentioned problems, and provides a flow rate integrated display device capable of immediately determining whether or not an error has occurred in an integrated value, displaying an error, and performing a certain level of error correction. Is what you do.

[0009]

In order to achieve the above object, a flow rate integrating and displaying apparatus according to the present invention comprises a flow rate measuring means for measuring a flow rate of a fluid, and an integrating means for integrating a signal from the flow rate measuring means. Display means for displaying the integrated value integrated by the integrating means, storage means for storing and updating the integrated value at regular time intervals, and the integrated value integrated by the integrating means and stored in the storage means. A comparison means for comparing the stored value and outputting an error signal when a difference equal to or more than a certain level occurs; and an error display means for displaying an error based on a signal from the comparison means.

[0010]

According to the present invention, an error signal is output from the comparing means when the gas consumption accumulated in the integrating means becomes an erroneous value due to noise such as a lightning surge, and an error occurs in the integrated value. Is displayed by the error display means. Furthermore, since the integrated value stored in the integrating means is replaced with the stored value stored in the storing means, the integrated value error is corrected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals. In FIG. 1, 1 is an outdoor gas pipe, 2 is an indoor gas pipe, 3 is a flow measuring means connected to indoor and outdoor pipes 1 and 2, 4 is an integrating means, 5 is a display means, 7 is a storage means, and 8 is a constant. Period integration means, 9 is addition means, 10 is comparison means, 1
Reference numeral 1 denotes an error display unit. Reference numeral 6 denotes a gas meter. The integrating means 4 integrates the flow rate used since the gas meter 6 was attached. Then, the integrated value is displayed on the display means 5 composed of liquid crystal. Further, the integrating means 4 outputs the integrated value to the storage means 7 at every certain time, for example, every 24 hours. In the storage means 7, the stored value is updated with a new integrated value every 24 hours. The constant period integrating means 8 converts the flow rate pulse from the flow rate measuring means 3 into a gas usage amount and integrates the same. Then, the synchronizing means 8 is reset for a certain period in synchronization with the transmission timing of the signal sent from the integrating means 4 to the storage means every 24 hours. That is, the fixed period integration means 8
Counts the amount of gas used during 24 hours. In the adding means 9, the signals of the storage means 7 and the fixed period integrating means 8 are added. Therefore, the signal from the adding means 9 has the same value as the signal from the integrating means 4 unless an error occurs. The comparing means 10 compares the signal from the accumulating means 4 and the signal from the adding means 9 and, if there is a difference of a certain level or more, sends an error signal indicating that an error has occurred. And error display means 1
An error display is performed by 1. On the other hand, when an error signal is sent from the comparing means 10, the storing means 7 outputs the stored value (= the gas usage amount up to the previous day) to the integrating means 4,
The integrating means 4 replaces the integrated value with information from the storage means 7. The storage means 7 is composed of a non-volatile storage element such as an E ² RAM, and does not malfunction due to power supply noise. Further, since the writing energy is much larger than that of a normal RAM, malfunction due to noise input to the writing terminal is small. Further, since the storage means 7 is an intermittent operation every 24 hours, it is easier to take noise countermeasures than the integrating means 4 which must always be operated. Therefore, the noise resistance of the storage means 7 can be made much stronger than that of the integrating means 4.

[0012]

As described above, according to the flow rate integrating display device of the present invention, it is possible to detect the occurrence of an error in the integrated value due to noise such as a lightning surge and to display an error, and to display an error-free integration. Since the value can be replaced with the integrated value up to the previous day, the gas user has the advantage of a slight charge reduction, and the gas supplier also has the effect of reducing the income slightly.

[Brief description of the drawings]

FIG. 1 is a block diagram of a flow rate integrating display device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional flow rate integration display device.

[Explanation of symbols]

 Reference Signs List 1 outdoor gas pipe 2 indoor gas pipe 3 flow rate measuring means 4 integrating means 5 display means 6 gas meter 7 storage means 8 constant time integrating means 9 adding means 10 comparing means 11 error displaying means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01F 15/075

Claims (2)

(57) [Claims] A flow rate measuring means for measuring a flow rate of a fluid;
An integrating means for integrating a signal from the flow rate measuring means,
Display means for displaying the integrated value integrated by the integrating means;
Storage means for storing and updating the integrated value at regular time intervals;
The integrated value obtained by the integrating means and the value stored in the storage means are stored.
When a difference of more than a certain level occurs when comparing the stored value
A comparing means for generating a control output, outputting the stored value stored in the storing means to the integrating means under the control of the comparing means, and calculating the integrated value stored in the integrating means with the stored value. A flow rate integration display device configured to be replaced. 2. A flow rate measuring means for measuring a flow rate of a fluid;
An integrating means for integrating a signal from the flow rate measuring means,
Display means for displaying the integrated value integrated by the integrating means;
Storage means for storing and updating the integrated value at regular time intervals;
A fixed period integrator for integrating your Keru signal for a certain period from the flow measuring means, a signal from the fixed period integrator
Compares the adding means for adding the signals from said storage means, and a signal from the signal and the adding means from said integrating means
The ratio of outputting a control signal when a difference equal to or greater than a predetermined level occurs.
And a flow rate integrating and displaying device.