JP3210122B2 - Flow data storage device - 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 data storage device which obtains a flow rate signal from a flow meter and stores data on a flow rate change over time.

[0002]

2. Description of the Related Art In order to ascertain the usage status of a fluid such as water supply at each use location, a recording device may be installed at the location for a predetermined period to record a temporal change in flow rate. Conventionally, this type of recording apparatus does not record all flow rate signals obtained during the measurement period due to the storage capacity of the storage means, but measures the time interval in units of a certain predetermined amount of distribution, and this unit The point in time at which the time interval of the input signal changes for each flow rate is recorded to enable long-term recording.

More specifically, as shown in FIG. 3, a rotating plate 18 is coaxially fixed to a rotating shaft 16 of an impeller 14 provided in a pipe 9, and a magnet 20 is mounted on the surface of the rotating plate 18, and The rotation of the magnet 20 by the fluid passing through the pipe 9 is sensed by the sensing unit 12 installed in the vicinity, and the rotation of the impeller 14 becomes half
Sends the flow meter signal that outputs the flow rate signal to the processing means.When the pulse time interval is constant, it is not recorded individually, but when the flow rate changes and the pulse time interval changes, such flow rate data Was sent to the storage means and recorded.

In the case of a flow meter equipped with a computer in the flow meter, the operation is performed intermittently and a signal from a rotating section is monitored at predetermined time intervals in order to prevent consumption of the drive power of the computer. Was like that.

[0005]

However, conventionally,
There is a difference in the distribution of the magnetic force of the magnet 20 attached to the rotating plate 18, and there is a possibility that the attachment position of the magnet 20 and the sensed member may shift or the axis may be eccentric, so that even if the flow rate is constant, one cycle (In this case, the output pulse of the sensing unit 12 within one rotation of the rotating plate 18) may not be at uniform intervals. Also, in the case of a flow meter equipped with a computer, a gap occurs between the output from the rotating unit and the operation time of the computer, and the signal output from the computer and the signal actually output by the rotating unit are different. Time lag.

Then, the change in the pulse interval is determined to be a change in the flow rate flowing through the pipe 9, and is sent to the storage means and stored one by one, so that a great amount of data is stored in the storage device. As a result, the storage capacity of the storage means may be saturated in a short period of time, and the flow rate in the pipe 9 may not be measured and recorded for a long period of time.

[0007]

SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to record a measurement result over a long period of time even if the pulse interval becomes non-uniform at a constant flow rate due to a difference in magnetic force distribution of a magnet of a flow meter. For this purpose, the flow rate data storage device is provided with a function that allows the reference value of the variation of the pulse interval for determining whether or not to send to the storage means to be arbitrarily changed.

[0008]

Even when the flow rate is constant, the pulse interval fluctuates by setting the reference value to be larger than the fluctuation width of the pulse interval caused by the attachment of the rotating part or the deviation from the operation interval of the computer. The processing means can determine that the flow rate has not been changed, that is, no change has occurred in the flow rate. Therefore, it is not determined that a change has occurred in the flow rate when the flow rate is constant, and unnecessary data is not stored in the storage means, so that it is possible to measure for a long time and store the measurement result.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flow data storage device according to the present invention will be described below. The flow data storage device 2 is connected to the flow meter 4 as shown in FIG. 1, and includes a processing unit 6 for processing a signal from the flow meter 4 and a storage unit 8 for storing the signal processed by the processing unit 6. It is configured to measure the flow rate in the pipe 9 to which the flow meter 4 is attached and to store the information at the same time.

As shown in FIG. 2, the flow meter 4 includes a rotating unit 10 provided inside a pipe 9 such as a water pipe, and a sensing unit 12 for sensing the rotation of the rotating unit 10. It is connected to the means 6 and outputs a signal. The rotating unit 10 includes an impeller 14 provided in the pipe 9 and an impeller 1
When the impeller 14 is rotated by tap water flowing through the pipe 9, the rotary plate 18 also rotates at the same rotation speed. It is determined in advance how many liters of tap water corresponds to one revolution of the impeller 14. A magnet 20 is attached to the rotating plate 18, and an N pole and an S pole are formed at both ends of the rotating plate 18 with the center rotating shaft 16 interposed therebetween. The sensing unit 12 reacts to the north pole and south pole of the magnet 20 and can detect the approach thereof, and outputs the signal to the processing unit 6 as described above.

In the case of a flow meter having a built-in computer, a signal from the sensing section 12 is processed and then output to the processing means 6.

The processing means 6 processes N-pole and S-pole signals (pulses) from the flow meter 4 and outputs the processed signals to the storage means 8. The contents of the processing are not output to the storage means 8 when the pulse from the flow meter 4 is being sent at a constant interval, but when a change occurs in the pulse interval, the time and immediately before this change. The number of pulses between the change and the change is output as a set of data. In this way, it is assumed that there is a constant flow rate in the pipe 9 from the time when the signal is recorded to the next recording, and the flow can be processed, and at which point the flow rate changes from what value to what value. If the determination can be made, the flow rate during the entire measurement period can be grasped, and the amount of data stored in the storage means 8 can be reduced.

Further, the processing means 6 can change the reference value of the variation width for determining how much variation occurs in the pulse interval and sending data to the storage means 8 when the variation occurs in the pulse interval. Has become. That is, when the output pulse interval is not constant even if the flow rate is constant due to a mechanical factor of the flow meter 4 or the like, the fluctuation width caused by the sensor or the like is covered, and the fluctuation is reduced. The flow rate can be regarded as constant, not as a change. The reference value is, for example, 5% of the flow rate of the fluid flowing through the pipe 9 or 1
There are a case where it is set by 0% or a ratio to the flow rate, and a case where it is set by a predetermined amount irrespective of the flow rate.

Therefore, the flow rate data storage device 2 does not change the pulse interval of the pulse sent from the flow meter 4 even if the pulse interval changes due to various causes of the flow meter 4, that is, the flow rate is constant. Since it can be regarded as being present, if the flow rate is constant, it can be obtained as pulses at uniform intervals. Therefore, when the flow rate in the pipe 9 is constant, the pulses can always be regarded as having a constant interval even if there is a fluctuation in the output pulse interval due to the flow meter 4 or the like. During the flow, the pulse interval fluctuates, so that it is determined that the flow rate has changed and a signal is not output to the storage means 8, and the measurement result is recorded for a sufficiently long period even with a small storage capacity. can do.

[0015]

According to the flow rate data storage device of the present invention,
Since the reference value of the variation of the pulse interval, which is used as a reference for sending to the storage means, can be set arbitrarily, the flow rate may be changed due to the attachment of the rotating part or the deviation from the operation interval of the computer. Even when the pulse interval fluctuates even at a constant time, the pulse interval fluctuation is not regarded as a flow rate fluctuation, and it can be obtained as a pulse generated at a constant interval if it is flowing at a constant flow rate. Can,
Unnecessary data is not stored, and long-term measurement and the measurement result can be stored.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a flow rate data storage device of the present invention.

FIG. 2 is a sectional view showing a flow meter.

[Explanation of symbols]

 2 Flow rate data storage device 4 Flow meter 6 Processing means 8 Storage means 9 Tube 10 Rotating unit 12 Sensing unit 14 Impeller 16 Rotating shaft 18 Rotating plate 20 Magnet

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masahiko Ito 3-6-4-102 Mansion Oaks, Kita-ku, Tokyo (72) Inventor Tomoyuki Yokosuka 5-29-1, Kasumigaseki Kita, Kawagoe-shi, Saitama (56) References JP-A-7-55532 (JP, A) JP-A-8-43166 (JP, A) JP-A-4-60420 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name ) G01F 1/00-15/18 G01F 9/00

Claims (3)

(57) [Claims] 1. A time interval of a flow signal output from a flow meter every time a unit amount of fluid passes is measured, and a time interval at which a change in the flow rate was previously generated is sequentially compared with a time interval.
A flow rate data storage device for storing flow rate data in a storage means when there is a change exceeding a reference value, wherein a function of arbitrarily setting the reference value is provided. 2. The method according to claim 1, wherein the reference value is set to 1 for the flow rate of the fluid.
The flow rate data storage device according to claim 1, wherein the flow rate data storage device can be set in a range of 30% to 30%. 3. The flow rate data storage device according to claim 1, wherein the reference value is set to a predetermined value regardless of the flow rate of the fluid.