JPH0820285B2 - Vertical drainage pipe flow measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for measuring a drainage flow rate flowing down a vertical drainage pipe in a drainage pipe system of a building.

(Prior Art) In a building, particularly a high-rise building, drainage from a drainage device is discharged through a drainage pipe line formed by a combination of a large number of horizontal drainage pipes and vertical drainage pipes. Therefore, when designing a drainage system for a newly constructed building, it is necessary to know the flow rate of drainage flowing down the vertical drainage pipe by actually using the drainage equipment in order to determine the pipe diameter and system. Becomes Therefore, the design data of the drainage pipe system of the new building is sought by measuring the drainage flow rate while using the drainage equipment in the high-rise hotels that are already actually operating.

Conventionally, the measurement of the drainage flow rate flowing through a vertical drain pipe in a building has not been directly measured in the vertical drain pipe. This is because the flow in the vertical drainage pipe is a gas-water multiphase flow, and there is no flow rate measurement method. Therefore, in the horizontal drainage pipe connected to the lower end of the vertical drainage pipe, the flow rate was measured at a part where the flow was stable far from the vertical drainage pipe (actually, in a so-called Kaisho Masu).

(Problems to be solved by the invention) Since the flow rate in the horizontal drainage pipe part where the flow is stable far from the vertical drainage pipe is much smaller than the actual flowrate in the vertical drainage pipe, accurate flow rate measurement Was difficult. Therefore, it was not satisfactory as the design data for the drainage system of the new building. In addition, there is no unmanned means to obtain the flow rate data over a long period of time, and a great amount of labor is required to obtain the data.

In view of the above, the present invention can automatically obtain a more accurate measurement value of the vertical flow rate of the drainage pipe over a long period of time, and further facilitates grasping the change over time of the flow rate from the display data after measurement. It is an object of the present invention to provide a flow measuring device for a standing drainage pipe.

(Means for Solving Problems) In order to achieve the above-mentioned object, the device for measuring the flow rate of a vertical drain pipe according to the present invention provides a means for measuring the vibration intensity of a vertical drain pipe and a predetermined measurement signal thereof. Digital value every sampling time
An A / D converter for A / D conversion and output, a first calculation means for calculating an average value of the digital values for each predetermined number of digital values corresponding to the first set time, and a second set time For each corresponding plurality of average values, the second calculating means for obtaining the maximum value of the average values, and the maximum value obtained by the second calculating means for each second set time are defined as the flow rate of the vertical drainage pipe. Third computing means for sequentially converting the flow rate from the correlation with the vibration intensity,
And a display unit for displaying the converted flow rate in the third calculation unit.

(Operation) In the flow rate measurement principle according to the present invention, the vibration intensity of the vertical drain pipe during drainage flow has a correlation with the drainage flow rate regardless of the floor of the drainage equipment used in a high-rise building, for example. Based on points. As a result, for example, in a newly constructed high-rise hotel, before the opening of business, the drainage equipment on a specific floor is drained with various flow rates, and the correlation between the vibration intensity of the vertical drainage pipe and the drainage flow rate is calculated. If you obtain it in advance, the drainage flow rate when using drainage equipment on any floor after the start of business,
It can be obtained by measuring the vibration intensity of the vertical drain pipe. In this way, the amount of drainage that actually flows down the vertical drainage pipe can be obtained by measuring the vibration intensity of the vertical drainage pipe, which has a direct correlation with this, so that more accurate flow rate measurement than in the past is possible. Therefore, it can be suitably used as a design material for the drainage system of buildings thereafter.

By the way, in the vertical drainage pipe, a random vibration occurs when an impact is applied to a building, for example, when an object is dropped on the floor. In order to eliminate the influence of this miscellaneous vibration, in the present invention, the vibration detection signals in the measuring means are sequentially A / A at predetermined sampling time intervals.
With respect to the digital value obtained by D conversion, an average value is calculated every first set time (for example, 5 seconds). As a result, the value corresponding to the miscellaneous vibration that disappears in a short time becomes sufficiently small, and the signal train more accurately corresponding to the drainage flow rate can be obtained.

Furthermore, if you display it as is at this time interval,
For example, in a long-time measurement for 24 hours, an enormous amount of data is generated, which makes it difficult to grasp the change over time in the flow rate after the measurement. Therefore, every second set time (for example, 3 minutes),
The maximum value of the above average values is obtained, and the flow rate corresponding to this maximum value is displayed as the flow rate flowing down the vertical drain pipe between them. As a result, even if automatic measurement is performed for a long time, it is possible to easily grasp the change over time in the flow rate from the display data.

(Example) First, an example of obtaining the correlation between the vibration intensity of the standing drain pipe during the drainage of the drainage equipment of a building and its flow rate,
This will be described with reference to FIGS. 1 to 6.

FIG. 5 relates to a drainage pipe system of a high-rise building, 1 is a standing drainage pipe, which is formed by a collecting pipe 2 arranged on each floor and a standing pipe 3 connecting these collecting pipes 2. Reference numeral 4 is a horizontal drainage pipe, and drainage equipment such as a bathtub 5 (indicated by a symbol □ in the tables of the following specification) and a washbasin 6 (indicated by a symbol ▽ in the tables of the following specification) on each floor are provided. In addition to being connected, they are also connected to a collecting pipe 2 for pouring the drainage from these drainage devices into the standing drainage pipe 1.

Fig. 4 shows a device for measuring the vibration intensity of the vertical drain pipe 1.
It is composed of a sensor 7 attached to the vertical drainage pipe 1 at a height of 600 mm from the floor, a vibration accelerometer 8, and a pen-writing recorder 9.

1 and 6 and Table 1 show the vertical drain pipe 1
2 shows the relationship between the flow rate of drainage flowing down and the vibration acceleration of the vertical drainage pipe 1 during the flow of drainage. This is a measurement in which the flow rate of the vertical drainage pipe 1 is changed in 12 steps from 0 to 696 l / min, and the vibration acceleration is measured for each flow rate.

The change in the drainage flow rate is 59 l / min for the drainage flow rate from the bathtub 5, and 28 l / min for the drainage flow rate from each washbasin 6, so the number and type of the bathtub 5 and washbasin 6 to be drained are changed. I did it. For example, in Table 1, N
In the o.4 measurement, the flow rate is 118 liters / min by draining from the bathtub 5 on the 22nd and 34th floors (the same applies to Tables 2 and 3 below).

In addition, the drainage from the bathtub 5 and the washbasin 6 is the standing drainage pipe 1.
Since the time to reach each is different from each other, measure that time in advance so that the drainage flows into the vertical drainage pipe 1 at the same time. Also, when combining drainage equipment on different floors, measure the drop time of drainage in advance and The drainage was timed so that it would flow through the vertical drain pipe due to the overlapping drainage.

As a result of this measurement, as is clear from the chart, it can be seen that the discharge flow rate and the vibration have a positive correlation, and that the discharge flow rate is substantially proportional when the discharge flow rate is 59 liters / minute or more.

Fig. 2 and Table 2 show the measurement results when the height of the drainage floor was changed.

As shown in Table 2, the vibration intensity when the same flow rate was drained from one bath was measured on different floors from the 12th floor to the 34th floor. From this result, it can be seen that the height of the drainage floor hardly affects the acceleration of vibration.

Figure 3 and Table 3 show that the height of the drainage floor is concentrated on the higher floors (measurement rows of No. 21 and No. 24 in Table 3) and the height of the drainage floor is concentrated on the middle floors (No in Table 3). .22 and No.25 measurement lines) and when concentrated on lower floors (N in Table 3)
o.23 and No.26 measurement sequence) indicate whether or not the intensity of vibration is affected.

As a result, the same flow rate (354 liters / minute, 236 liters / minute) was drained from each floor evenly (No. 8 in Table 1).
And the measurement sequence of No. 6), it can be seen that the difference in drainage hierarchy does not significantly affect the vibration acceleration.

From the above results, if the correlation between the vibration intensity of the standing water pipe 1 during drainage flow and its flow rate is experimentally obtained in advance as described above, the drainage equipment of the building is actually used. Also, by measuring the vibration intensity of the vertical drainage pipe, the flow rate of the vertical vertical drainage pipe can be obtained from the measured value and the correlation, which can be used for designing the vertical drainage pipe of the building.

Next, a measuring device that converts the intensity of vibration of the vertical drain pipe 1 into a flow rate and displays the flow rate will be described. In FIG. 7, 10
Is a measuring device (measuring means) for measuring the vibration intensity of the vertical drainage pipe 1. Reference numeral 11 is an A / D converter, which converts an analog signal of the vibration intensity measured by the measuring device 10 into a digital signal. 12 is a computer, input / output device 1
3,14 and the arithmetic unit 15 as the first, second and third arithmetic means
And a storage device 16. A printer 17 as a display means displays the flow rate output from the computer 12.

The flow rate measurement according to the above configuration is performed according to the flowchart shown in FIG. First, the A / D converter 11 is triggered every predetermined sampling time, the analog signal of the vibration intensity measured by the measuring device 10 is converted into a digital signal, and the digital signal is sequentially input to the computer 12 ( In this embodiment, values of 2 points are sampled in 1 second).

Then, with respect to the digital values sequentially input to the computer 12, the arithmetic unit 15 sets the first set time (5 in this embodiment).
Every second), the average value (AVE) of those digital values is calculated. Here, in the first set time, as shown in FIG. 9, the continuous vibrations 18 are continuously performed so that the average strength of the vibrations 18 can be made smaller than the average strength of the drainage vibrations 19. It should be longer than the time and shorter than the continuous time of drainage vibration. The first set time is appropriately determined depending on the type of drainage device and the like, but is preferably about 2 to 8 seconds.

Next, when the average value is smaller than the constant value (K), it is regarded as a rough vibration and is set to zero.

Next, with respect to the average value (AVE) sequentially obtained as described above, a plurality of average values (AVE) corresponding to the second set time
For each, the maximum value (AVEMAX) of those average values (AVE)
To determine. The second set time described above is set to 3 minutes in the present embodiment. Therefore, for each of the 36 average values (AVE) corresponding to the 3 minutes, the maximum value (AVEMA) thereof is set.
X) is calculated sequentially. The second set time is set so that it is easy to understand the tendency of the change over time in the flow rate. That is, if it is too short, the display flow rate increases and it is difficult to read the change over time, and if it is too long, the display flow rate decreases and the tendency of change over time cannot be expressed. In order to know the change in the flow rate per day, it is preferable to set the time such that the maximum value is sequentially obtained from the average value of 10 to 300 (in this embodiment, 1440 minutes / 3 minutes =
The flow rate of 480 will be displayed).

Next, the maximum value obtained as described above is converted into a flow rate.
In this conversion, as described above, the flow rate with respect to the maximum value is obtained from the correlation between the flow rate and the vibration intensity (for example, the correlation between the flow rate and the vibration is obtained by linear approximation). And
This flow rate data is output from the computer 12 and output by the printer 17 as shown in FIG.

Table 4 and FIG. 11 show the relationship between the flow rate of the drainage discharged from the drainage device and the vibration intensity. The vibration intensity corresponding to each flow rate is the average value of the digital value for 5 seconds as described above, and indicates the maximum value of 3 minutes (36 pieces) by the voltage magnitude. Comparing FIG. 11 with FIG. 1 showing the relationship between the vibration intensity and the flow rate read from the recording by the pen recorder, it can be seen that both show the same correlation. That is, the drainage flow rate can be accurately measured using a computer.

(Effect of the Invention) According to the present invention, more accurate flow rate measurement is possible by measuring the vibration intensity of the vertical drainage pipe, which has a correlation with the drainage flow rate flowing down the vertical drainage pipe. In this case, for the digital value obtained by A / D converting the vibration detection signal from the measuring means,
The average value is calculated for each set time, and the maximum value of the above average values is calculated for each second set time, and the flow rate corresponding to this maximum value is displayed as the flow rate flowing down the vertical drain pipe between them. Therefore, it is possible to measure the flow rate accurately without the influence of noise and vibration, and even if automatic measurement is performed for a long time, it is possible to easily grasp the change over time of the flow rate from the display data after measurement. . As a result, it can greatly contribute to the design of the drainage system of a building.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the flow rate of drainage flowing down the vertical drainage pipe and the acceleration of vibration of the vertical drainage pipe, and FIG. 2 is a graph showing the relationship between the height of the drainage floor to the vertical drainage pipe and the vibration acceleration, FIG. Is a graph showing the vibration acceleration when the height of the drainage floor is concentrated in the low, middle and high layers, FIG. 4 is a schematic configuration diagram of the vibration acceleration measuring device, FIG. 5 is a schematic configuration diagram of the vertical drainage pipe, and 6 Figure (1)
(2) is a recording diagram of the vibration acceleration of the vertical drainage pipes of measurement No. 3 to No. 12 by a pen-writing recorder, FIG. 7 is a schematic configuration diagram of the flow rate measuring device, and FIG. 8 is a flow chart showing a flow rate measurement processing procedure. FIG. 9 is an explanatory view of a method for treating the vibration intensity of the vertical drainage pipe, FIG. 10 is a recording diagram of the displayed flow rate, and FIG. 11 is a graph showing the relationship between the drainage flow rate and the digital value of the vibration intensity. . 10 …… Measuring device (measuring means), 11 …… A / D converter, 12 ……
Computer, 15 ... Computing device (first, second and third computing means), 17 ... Printer (display means).

Claims (1)

[Claims] 1. A means for measuring the vibration intensity of a vertical drainage pipe, and the measurement signal is converted into a digital value at a predetermined sampling time A /
A / D converter for D-converting and outputting, for each predetermined number of digital values corresponding to the first set time, first calculating means for calculating the average value of those digital values, and for the second set time For each of the plurality of average values, the second calculating means for obtaining the maximum value of the average values, and the maximum value obtained by the second calculating means for each second set time are calculated as A flow measuring device for a stand-up drainage pipe, comprising: a third calculating means for sequentially converting into a flow rate based on a correlation with strength, and a display means for displaying a converted flow rate by the third calculating means.