JPH07182306A - Flow rate and pressure simulation device for piping - Google Patents

Abstract

PURPOSE:To easily find the demanded amount of fluid of the piping required for a pipe network analysis by storing a facility data base including diameter data on the piping, estimating the supply amount of fluid from the included diameter data on the piping, and determining the demanded amount of fluid of the piping. CONSTITUTION:A computer 11 retrieves the supply amount in a polygon and sends a supply pipe number to a customer data processing system 2 through a communication line 3. A computer 21 retrieves a customer number on the basis of the supply pipe number by referring to a table E, computers the maximum demanded amount by using the customer data base D, and sends it to a pipe network analytic processing system 1 through the communication line 3. The computer 11 sets respective demanded amounts at supply pipe takeout positions of the piping. Once the demanded amounts are determined, complicated piping is put in a pipe network thereafter, a loop is further determined, and an initial flow rate in the pipe network is determined, thereby performing computation by a Hardy cross method. Pressure at a consumer node is displayed as a computation result on a display 17 and the processing ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is useful for confirming the supply pressure of gas or water and for determining the pipe diameter for supplying gas or tap water in response to an increase in demand, The present invention relates to a pressure simulation device.

[0002]

2. Description of the Related Art Gas and water supply companies must always supply a required flow rate to a customer at a necessary pressure, so it is necessary to check whether the supply pressure is stable or to check the demand volume. For the increase, it is necessary to design piping with sufficient diameter. Although there is a difference between gas and tap water as a compressed fluid or an incompressible fluid, it is known that there is a constant hydrodynamic relationship between the flow rate, pipe length, and pressure. Have also been confirmed.

Since gas and water pipes are usually attached in a mesh form, they are called pipe networks, and a pipe network analysis technique for determining the pressure at a specific position of the pipe network and the flow rate of the specific pipe has been established. A flow rate / pressure simulation device utilizing this pipe network analysis technology has been developed. Since the pipe network has a complicated shape including multiple loops, nonlinear multi-system equations must be solved in the pipe network analysis, and the calculation is extremely complicated and time consuming. As one of the solutions, the Hardy-Cross method has been known for a long time and has been used for pipe network analysis in the field of water supply for a long time. According to this method, an arbitrary loop is selected in the pipe network, the condition that the inflow amount and the outflow amount of the fluid at each node (branch point) of the loop are equal, and the pressure drop when the loop makes one turn is 0. Calculate the pressure drop in each pipeline assuming the flow rate in any pipeline in the loop so that the condition that is satisfied, and if there is a contradiction, change the flow rate assumption and repeat the calculation. . As a result, for all loops in the pipe network, when the pressure difference when making one turn around the loop becomes 0, the flow rate flowing in each pipeline is the correct solution, and the pressure at a specific node is calculated using this flow rate. can do.

The disadvantages of the pipe network analysis by the Hardy-Cross method are that the operator must select a loop and it is difficult to assume the flow rate of the pipe. Since the number of loops reaches 50 even in the area of only 1 square km, the burden on the operator in the actual calculation is enormous and the calculation error becomes large.

Therefore, the present applicant has filed Japanese Patent Application No. 3-309131.
In this issue, we propose a method for efficiently and automatically selecting loops and determining initial values in pipe network analysis. In this method, when the apparent resistance value is accumulated from the supply source, there is a place where the accumulated resistance value is always obtained from the left and right to collide with each other in a loop. Since this value is the cumulative value from the supply source, it is the maximum cumulative resistance value in the route. This maximum cumulative resistance value is adjusted to be the minimum, and the number of pipes with the maximum cumulative resistance value that is the result of the adjustment matches the number of loops, so use the pipe with the maximum cumulative resistance value as the loop index. It will be possible. This is called the "loop source pipe". The above is the principle of loop selection. From this method of selecting the loop source pipe, it is expected that the amount of fluid flowing through the loop source pipe is the minimum value, that is, 0. Therefore, the flow rate of the loop source pipe is set as an unconstant and the initial setting value is set to 0. This is the principle of the initial value setting method. Since the Hardy-Cross method is a method in which the calculation time becomes shorter as the initial value is closer to the true value, the calculation time of the pipe network analysis can be shortened by this method.

[0006]

In the pipe network analysis according to the above-mentioned prior application and the pipe network analysis before that, how the demand amount of the fluid required for the analysis was obtained is that from the experience, it is a consumer The demand amount per house is calculated and multiplied by the number of consumers supplied from the selected pipe to obtain the demand amount. More roughly, the demand amount per unit pipeline length of the pipe is calculated in advance. Every time, there was a method such as multiplying it by the actual pipe length to obtain the demand amount, but this work is also quite difficult and time consuming, and the result of the pipe network analysis will be rather rough. There is a problem.

By the way, recently, in addition to map information such as terrain, information of buried pipes such as gas and water is stored in a database and stored, and new or expanded pipes or management,
Mapping systems have been developed to make emergency response quick and easy. In connection with this mapping system, electric power companies, gas companies, water supply companies, etc. have computer systems for processing customer information in a database.

The inventors of the present invention have also empirically learned that there is a correlation between the diameters of gas supply pipes and water supply pipes and the maximum demands of gas and tap water supplied from the pipes. ing.

The present invention has been made by paying attention to the above points, and in a device for simulating the flow rate and pressure of a pipe supplying a fluid such as gas or tap water by the pipe network analysis, the demand required for the pipe network analysis. The purpose is to facilitate the determination of the quantity.

[0010]

According to one aspect of the present invention, in order to achieve the above object, the flow demand and pressure of a pipe are calculated by allocating a fluid demand amount to the pipe and executing a pipe network analysis. The flow rate / pressure simulation device for piping is provided with a storage means for storing a customer database including fluid supply amount data, and a demand amount calculation means for calculating the fluid demand amount of the pipe from the fluid supply amount data of the customer database.

According to another aspect of the present invention, in order to achieve the above object, a flow rate of a pipe is calculated by allocating a fluid demand amount to the pipe network and executing a pipe network analysis. In the pressure simulation device, storage means for storing a facility database including pipe diameter data, estimating means for estimating a fluid supply amount from the pipe diameter data included in the facility database, and fluid demand for the pipe from the fluid supply amount. The demand amount determining means for determining the amount is provided.

[0012]

According to the present invention, with the above configuration, the fluid demand amount calculated from the fluid supply amount data of the customer database or the fluid demand amount determined from the pipe diameter data included in the facility database is used to pipe by the Hardy-Cross method or the like. Perform net analysis.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of a flow rate / pressure simulation apparatus for piping according to the present invention.

This flow rate / pressure simulation device is
The network analysis processing system 1 and the customer data processing system 2 are connected by a communication line 3. The communication line 3 is a digital line or a wireless line.

The network analysis processing system 1 includes a computer 11, external storage devices 12 and 13, a search output terminal 14,
Digitizer 15, tablet 16, display 17,
It has a hard copy 18, an electrostatic plotter 19, and the like.

The computer 11 causes the display 17 to display the map data in the map database A stored in the external storage device 13 in response to a command input from an input device such as the digitizer 15 or the tablet 16, or a communication line. Processing such as data communication with the customer data processing system 2 via 3.

The external storage device 12 has an application area B in which a program for executing the network analysis is stored, and a work area C for temporarily storing data necessary for the network analysis and a result obtained during the analysis. And have. The content of the application is the loop selection method of the network, the initial value determination method, the subsequent network calculation, etc.
As an example, Japanese Patent Application No. 3-309 filed by the present applicant
There is a method proposed in No. 131. However, the method of computer-aided network analysis is not limited to this, and the description is omitted because it is not the gist of the present invention.

Another external storage device 13 has a scale of 1
A map database A is stored which has about 2700 basic national maps of / 500, and the digitizer 15 stores graphic data such as supply pipes on the basic national maps. The map database A also includes equipment data such as the pressure, diameter, and attribute data of the supply pipe as shown in FIG.

The search output terminal 14 is, for example, a personal computer, and is used when a desired portion of one piece of map data displayed on the display 17 is designated by a rectangle to define a setting area.

The digitizer 15 is used to indicate the coordinates of the supply pipe when writing or modifying the graphic data of the supply pipe or the like on one map.

The tablet 16 indicates the drawing number of the map database A in the external storage device 13, and when the map of the specified drawing number is displayed on the display 17 as a result, the tablet in the network within the set area of the map is displayed. Used when specifying a node such as a pressure source.

Hard copy 18 and electrostatic plotter 1
9 outputs the map displayed on the display 17 on paper.

Next, the customer data processing system 2 will be described.

The customer data processing system 2 has a computer 21, a keyboard 22, a display 23, an external storage device 24 and the like. When a customer number or the like is input from the keyboard 22, the computer 21 retrieves customer data having this customer number from the customer database D in the external storage device 24 and displays it on the display 23 or via the communication line 3. And sends it to the pipe network analysis processing system 1.

The external storage device 24 stores a customer database D and a table E. The customer database D is data relating to each customer, and the data format is shown in FIG.

"Customer number" as customer identification data, "address", "address" as customer data, "name", "phone number", "meter number", "previous month meter value", "previous month meter value" , "This month meter value" and other information.

Table E is a table showing the relationship between the customer number and the supply pipe number, and FIG. 3 is an example of the table. In this table, supply pipe B1 to customer A1
B2 and B3 are assigned when, for example, a customer such as a factory has three supply pipes. Further, two customers A2 and A3 are assigned to the supply pipe B4, for example, when there are two customers for one supply pipe in an apartment house such as an apartment.

Next, the operation of the pipe network analysis according to this embodiment will be described with reference to FIG.
It will be described based on the flowchart shown in FIG.

When the network analysis processing system 1 is driven by the search output terminal 14, the computer 11 asks the operator which region map to use. The operator uses the tablet 16 to input the map number, town name, street address, etc. of the area to be used. The computer 11 extracts the map data of the designated area from the map database A and displays it on the display 17.

Next, the operator designates all the vertices of the polygon covering the area to be analyzed by the network among the displayed areas by the tablet 16 (F-1). The computer 11 displays the polygon on the display 17. Up to this point, it is a normal function of a so-called mapping system used for facility management of water and gas.

The computer 11 extracts all the pipes contained in the polygon (F-2). Then, search all the supply pipes connected to the extracted pipes (F-3),
The supply pipe number of each supply pipe is sent to the customer data processing system 2 via the communication line 3.

In the customer data processing system 2, the computer 21 uses the table E stored in the external storage device 24.
The customer number is searched from the supply pipe number with reference to (shown in FIG. 3) (F-4). Once the customer number is known, this time the customer database D stored in the external storage device 24 (see FIG. 2).
The maximum demand amount is calculated for each customer from the following equations 1 and 2 (F-5).

[0034]

[Equation 1] Monthly supply (m ³ ) = (meter value of this month) −
(Meter value of previous month)

[0035]

[Equation 2] Maximum demand (m ³ / hour) = monthly supply /
Coefficient (for example, 0.02) The computer 21 of the customer data processing system 2 sends the thus calculated data of the maximum demand amount to the pipe network analysis processing system 1 via the communication line 3 (F-6). When the pipe network analysis processing system 1 receives this data, the computer 11
Sets each demand amount at the supply pipe take-out position of the pipe. It is possible to calculate the pipe network using the supply pipe take-out position as a customer node, but from the viewpoint of calculation accuracy and cost, the pipe 100
It is common to handle one consumer node for each m.

When the demands of the pipes to be calculated and the supply pipes connected to the pipes are determined, thereafter, the complicated pipes are used as the pipe network, and further the loop is determined (F-7), and the initial stage of flowing through the pipe network. The value flow rate is determined (F-8) and calculated by the Hardy-Cross method (F-9). The method for calculating the network is described in Japanese Patent Application No. 3-309131 mentioned above, so refer to it if necessary. As a result of the calculation, the pressure at the customer node is displayed on the display 17 and the process ends. In this way, the network analysis is performed, and the flow rate and pressure of the pipeline can be simulated.

Next, FIG. 5 shows another embodiment of the pipe flow rate / pressure simulation apparatus according to the present invention.

When the present inventors analyze the data obtained from the past results of installing the gas supply pipe, there is a tendency between the diameter of the supply pipe and the maximum demand as shown in FIG. It turned out to be. Therefore, in this embodiment, the demand amount required for the pipe network analysis is obtained based on the diameter of the supply pipe.

In this embodiment, the demand amount data as shown in FIG. 7 obtained empirically is used.

Now, as shown in FIG. 5, the flow rate / pressure simulation apparatus of this embodiment has a computer 11, external storage devices 12 and 13, a search output terminal 14, a digitizer 15, a tablet 16, a display 17 and a hard copy. 18 and an electrostatic plotter 19. Unlike the embodiment shown in FIG. 1, the customer data processing system is not necessary, but in addition to the map database A, the correspondence table G between the diameter of the supply pipe and the estimated demand amount shown in FIG. It is stored.

Next, the operation of the pipe network analysis according to this embodiment will be described with reference to FIG.
It will be described based on the flowchart shown in FIG.

The flow from the designation of the area to be analyzed in the pipe network (P-1), the extraction of the pipes in the area (P-2), and the analysis of the supply pipe connected to the pipe (P-3) is shown in FIG. The operation is the same as in the embodiment shown in FIG. Next, in this embodiment, the external storage device 1
The diameter of each supply pipe is obtained from the supply pipe number by referring to the equipment data (see FIG. 8) in the map database A stored in No. 3 (P-4), and then the table G (see FIG. 7).
The estimated demand amount of the supply pipe is obtained by referring to (P-5). When the demand for the supply pipe is determined in this way, thereafter, a complicated pipe is used as a pipe network, a loop is further determined (P-6), and an initial value flow rate through the pipe network is determined (P-7). Calculate the pressure at the customer node of the pipe by the cross method (P
-8), displaying on the display 17 is the same as in the embodiment of FIG.

By the way, although the method of estimating the demand amount from the diameter of the supply pipe as in the above embodiment is simple, the present inventors further analyzed the present situation and found that even if the supply pipe has the same diameter, I noticed that the average demand differs slightly depending on the characteristics of the attached area, that is, whether it is a single-family house, two-family house, commercial district, or industrial district. Therefore, district characteristic coefficients as shown in FIG. 10 are determined in advance for each supply pipe attached area and stored in the external storage device 13 in the form of a table, and the type of the supply pipe attached area is checked from the map database A, The estimated demand amount obtained from the table G in step (P-5) is corrected by multiplying it by the district characteristic coefficient of FIG. 10, and the demand amount obtained by the correction is used as demand amount data for the pipe network calculation, thereby making it more accurate. It becomes possible to simulate various flow rates and pressures.

[0044]

As described above, according to the present invention,
Since the amount of fluid required for pipe network analysis for simulating flow rate and pressure is extracted from the already prepared customer database or estimated from the diameter of the supply pipe included in the equipment data, As compared with the conventional method, the work of determining the demand amount is simpler and more accurate demand amount can be obtained. Therefore, the pipe network calculation and therefore the flow rate / pressure simulation can be performed easily and accurately.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of a flow rate / pressure simulation device for piping according to the present invention.

FIG. 2 shows a data format of a customer database D.

FIG. 3 shows a table E showing a relationship between a customer number and a supply pipe number.

FIG. 4 is a flowchart showing the operation of the pipe network analysis according to the embodiment shown in FIG.

FIG. 5 is a schematic diagram of another embodiment of the flow rate / pressure simulation apparatus for piping according to the present invention.

FIG. 6 shows the relationship between the diameter of the supply pipe and the maximum demand.

FIG. 7 shows a table showing the relationship between the diameter of the supply pipe and the estimated demand amount.

FIG. 8 shows an example of equipment data F.

9 is a flowchart showing the operation of the pipe network analysis according to the embodiment shown in FIG.

FIG. 10 shows district characteristic coefficients for each type of district.

[Explanation of symbols]

 1 Map data processing system 2 Customer data processing system 3 Communication line 11, 21 Computer 12, 13, 24 External storage device 14 Search / output terminal 15 Digitizer 16 Tablet 17, 23 Display 18 Hard copy 19 Electrostatic plotter 22 Keyboard

Claims (3)

[Claims] 1. A pipe flow rate / pressure simulation apparatus for calculating flow rate / pressure of a pipe by allocating a fluid demand amount to a pipe network and executing a pipe network analysis, and storing a customer database including fluid supply amount data. A flow rate / pressure simulation device for a pipe, comprising: means and a demand amount calculation means for calculating a fluid demand amount of the pipe from the fluid supply amount data of the customer database. 2. A pipe flow rate / pressure simulation device for calculating flow rate / pressure of a pipe by allocating a fluid demand to the pipe network and executing a pipe network analysis, and storing a facility database including pipe diameter data. Means, an estimating means for estimating a fluid supply amount from the pipe diameter data included in the facility database, and a demand amount determining means for determining a fluid demand amount of the pipe from the fluid supply amount. Flow rate / pressure simulation device for piping. 3. A storage means for dividing the area to which a piping network is attached into areas having different average fluid supply amounts for pipes of the same diameter and storing different area characteristic coefficients for each attached area, and the demand amount. The demand amount correcting means for correcting the fluid demand amount by multiplying the fluid demand amount of each pipe determined by the determining means by a district characteristic coefficient of a district to which the pipe is attached. Flow rate / pressure simulation device.