Method for constructing and calling resistance database based on ship valve opening degree

Abstract

The application provides a flow resistance database construction and calling method based on a ship valve opening degree, in the process of constructing the flow resistance database, the influence of multiple parameters, whether the valve has an opening degree indication, valve use, valve internal structure, valve nominal diameter and valve opening degree, on the valve flow resistance coefficient is fully considered, so that the shipbuilding process has accurate flow resistance data support from the principle design stage to the actual production debugging stage, the error probability is reduced, and resource waste is reduced. In addition, the calling method based on the above flow resistance database can accurately and quickly obtain the corresponding valve opening degree value under the premise that whether the valve has an opening degree indication, the valve use, the valve internal structure, the valve nominal diameter and the required flow resistance coefficient are determined, more accurate and convenient data support is provided for ship production and construction, the working difficulty of the on-site debugging personnel is reduced, and the production time is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship pipeline flow regulation, in particular to a method for constructing and calling a flow resistance database based on ship valve opening degree. BACKGROUND

[0002] Ship pipeline network, as an important part of ship device, provides the required water, oil, gas and other media for ship device, undertakes the role of medium flow and energy exchange between ship systems, and is the bridge and link connecting various power equipment of ship system. In the ship pipeline network system, the number of pipelines is large, the types are various, and the arrangement mode is complex. Therefore, in the actual design of ship system, the equipment selection and optimization design of pipeline system need to be based on pipeline network model flow simulation calculation. Unreasonable pipeline design and arrangement will lead to uneven flow distribution of pipeline. Too small flow distribution will lead to that the operating parameters before the equipment cannot reach the design value, and the equipment cannot operate normally. Too large flow distribution will lead to that the parameters before the equipment are too large, and the equipment operates under high load. Therefore, the accuracy of pipeline network flow simulation calculation is very important.

[0003] Pipeline network simulation calculation started in 1936. With the progress of shipbuilding technology and the trend of large-scale ship, modern ship system is more precise and complex, and pipeline network simulation calculation also develops towards automation, complexity and precision. For example, patent CN1293332A provides a pipeline network flow pressure calculation method based on equipment selection. The patent establishes a database of equipment and pipeline accessories. The equipment parameters can be selected from the database to calculate the pressure drop and flow of pipeline network by using the calculation formula.

[0004] In the prior art, pipeline network flow simulation calculation mainly calculates equipment units, pipe sections and pumps as main elements. Valves are often in full open or full closed state in the calculation of pipe section resistance. However, the resistance coefficient of valve will change due to the influence of factors such as valve type, internal structure, nominal diameter and opening degree value. Although the prior art establishes a valve database, it only defines the valve resistance coefficient as a fixed value, and does not consider the influence of valve opening degree value change on resistance coefficient and flow state, so it cannot meet the precision requirements of ship system in the design stage and construction stage.

[0005] The ship flow regulation distribution is regulated by the self valve as the main regulation means, specifically, the valve opening degree value is regulated, the flow resistance coefficient of the valve is changed, the flow and pressure in the pipe are regulated and controlled, and the pipe network flow regulation distribution is realized. In the actual operation of the ship, the valve is usually in the open or closed state, in order to meet the flow demand in the pipe network, a throttling orifice plate device needs to be added in the process of string washing debugging to simulate the valve regulation effect, when the relationship between the valve opening degree and the flow resistance coefficient is unknown, the size of the modified orifice diameter of the throttling orifice plate cannot be determined, which causes great difficulty in the processing process and often causes waste due to improper regulation. At the same time, in the process of on-site debugging, only the flow resistance coefficient can be calculated according to the required flow by using the existing valve flow resistance database and the pipe network simulation calculation method, and the on-site flow debugging personnel can hardly accurately regulate the pipe network flow according to the flow resistance coefficient data, and there are problems of great debugging difficulty and long period. Therefore, it is necessary to analyze the resistance characteristics of the valve under different types, different structures, different opening values and the like. SUMMARY

[0006] In view of the above-mentioned disadvantages of the prior art, the present application provides a flow resistance database construction method based on ship valve opening degree, in the process of constructing the flow resistance database, the influence of multiple parameters such as whether the valve has an opening degree indication, valve purpose, valve internal structure, valve nominal diameter and valve opening degree on the valve flow resistance coefficient is fully considered, so that the shipbuilding process has accurate flow resistance data support from the principle design stage to the actual production debugging stage, the probability of errors is reduced, and resource waste is reduced. In addition, the present application also provides a calling method based on the above-mentioned flow resistance database, under the premise of determining whether the valve has an opening degree indication, valve purpose, valve internal structure, valve nominal diameter and required flow resistance coefficient, the corresponding valve opening degree value can be accurately and quickly obtained, more accurate and convenient data support is provided for ship production and construction, the working difficulty of on-site debugging personnel is reduced, and production time is saved.

[0007] To achieve the above object and other related objects, the present application provides a flow resistance database construction method based on ship valve opening degree, comprising the following steps:

[0008] S1: constructing a first level database, in the first level database, the ship valve is divided into a first type valve and a second type valve, wherein the first type valve has no opening degree indication, and the second type valve has an opening degree indication;

[0009] S2: constructing a second level database under the first level database, in the second level database, the first type valve and the second type valve are classified according to different valve purposes, and the first type valve is further classified according to different valve internal structures;

[0010] S3: constructing a third level database under the second level database, in which the first type of valves of different internal structures are classified according to different nominal diameters, and the second type of valves of different uses are classified according to different nominal diameters;

[0011] S4: constructing a fourth level database under the third level database, in which the first type of valves and the second type of valves of different nominal diameters are classified according to different valve opening values;

[0012] S5: constructing a fifth level database under the fourth level database, in which different valve opening values correspond to different flow resistance coefficients, and the construction of the flow resistance database is completed.

[0013] Optionally, in step S2, according to different uses of the valves, the first type of valves is classified into stop valves and check valves, and the second type of valves is butterfly valves.

[0014] Optionally, in step S2, according to different internal structures of the valves, the stop valves are classified into straight-through valves and right-angle valves, and the check valves are classified into straight-through valves and right-angle valves.

[0015] Optionally, in step S3, the nominal diameters include DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN175, DN200 and DN250.

[0016] Optionally, in step S4, in the first type of valves, the valve opening values include 25%, 50%, 75% and 100%.

[0017] Optionally, in step S4, in the second type of valves, the valve opening values include 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%.

[0018] The application also provides a flow resistance database calling method based on ship valve opening, comprising the following steps:

[0019] S1: providing a flow resistance database, which is any one of the flow resistance databases based on ship valve opening;

[0020] S2: determining input parameters, including whether the valve has an opening indication, valve use, valve internal structure, valve nominal diameter and required flow resistance coefficient of the valve;

[0021] S3: In the flow resistance database, the corresponding valve opening value is obtained according to the input parameters to complete the call of the flow resistance database; if the corresponding valve opening value cannot be obtained according to the input parameters, the input parameters in step S2 are adjusted and the valve opening value is obtained again until it is successfully obtained.

[0022] The method for constructing and calling a flow resistance database based on ship valve opening provided by the present invention has at least the following beneficial effects:

[0023] The present invention provides a method for constructing a flow resistance database based on ship valve openings, fully considering the impact of multiple parameters on the valve flow resistance coefficient. This ensures accurate flow resistance data support throughout the shipbuilding process, from the conceptual design stage to the actual production and commissioning stages, reducing the probability of errors and minimizing resource waste. Furthermore, the present invention also provides a method for accessing the aforementioned flow resistance database. Based on the determination of whether a valve has an opening indication, the valve's purpose, its internal structure, its nominal diameter, and the required flow resistance coefficient, the method can accurately and quickly obtain the corresponding valve opening value. This provides more accurate and convenient data support for shipbuilding, reduces the workload of on-site commissioning personnel, and saves production time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a flow chart of the method for constructing a flow resistance database based on ship valve opening provided in Example 1.

[0025] Figure 2 Shown is a schematic diagram of a flow resistance database based on ship valve opening provided in Example 1.

[0026] Figure 3a The figure shows the flow resistance coefficient-valve opening curve of the first type of valve in the first embodiment.

[0027] Figure 3b The figure shows the flow resistance coefficient-valve opening curve of the second type of valve in the first embodiment.

[0028] Figure 4 The flowchart of the method for calling the flow resistance database based on the ship valve opening provided in the second embodiment is shown.

[0029] Component number description

[0030] 101 First-level database

[0031] 102 Second-level database

[0032] 103 Third-level database

[0033] 104 Level 4 Database

[0034] 105 Level 5 Database DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0036] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Although the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation, the form, quantity, positional relationship and proportion of each component in actual implementation can be changed at will under the premise of realizing the technical solution of this party, and the component layout form may also be more complicated.

[0037] Example 1

[0038] This embodiment provides a method for constructing a flow resistance database based on the opening of ship valves. Figure 1 As shown, the following steps are included:

[0039] S1: constructing a first-level database, in which ship valves are divided into first-category valves and second-category valves, wherein the first-category valves have no opening indication, and the second-category valves have an opening indication;

[0040] As an example, commonly used ship valves can be divided into two categories according to whether they have an opening indication. One category is valves without an opening indication, that is, the operator can only judge the valve opening value based on experience; the other category is valves with an opening indication, that is, the operator can accurately know the valve opening value based on the opening indication.

[0041] like Figure 2 As shown, a first-level database 101 is constructed. In the first-level database 101, ship valves are divided into first-category valves and second-category valves, wherein the first-category valves have no opening indication, and the second-category valves have opening indication.

[0042] S2: constructing a second-level database under the first-level database, wherein the first-type valves and the second-type valves are classified in the second-level database according to different uses of the valves, and the first-type valves are further classified according to different internal structures of the valves;

[0043] like Figure 2 As shown, a second-level database 102 is constructed under the first-level database 101, that is, the first-type valves and the second-type valves are further classified according to the difference in valve usage and valve internal structure.

[0044] First, the first and second category valves are categorized according to their uses. In this embodiment, the first category valves are divided into stop valves and check valves, and the second category valves are butterfly valves. In other optional embodiments, the first and second category valves can be divided into more categories, which will not be detailed here.

[0045] Next, the first type of valves are further classified according to the difference in the internal structure of the valves. In this embodiment, the stop valves are further divided into straight-through valves and right-angle valves, and the check valves are also divided into straight-through valves and right-angle valves.

[0046] S3: constructing a third-level database under the second-level database, wherein in the third-level database, various types of the first-type valves with different internal structures are classified according to different nominal diameters, and various types of the second-type valves with different uses are classified according to different nominal diameters;

[0047] like Figure 2 As shown, a third-level database 103 is constructed under the second-level database 102. In the third-level database 103, valves are further classified according to their nominal diameters. In this embodiment, the nominal diameters include DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN175, DN200, and DN250. In other alternative embodiments, the nominal diameters may have other values.

[0048] As an example, in the third-level database 103, straight-through stop valves, right-angle stop valves, straight-through check valves, right-angle check valves and butterfly valves are classified according to nominal diameters DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN175, DN200 and DN250.

[0049] S4: constructing a fourth-level database under the third-level database, wherein the first-type valves and the second-type valves having different nominal diameters are classified according to different valve opening values ​​in the fourth-level database;

[0050] like Figure 2 As shown, a fourth-level database 104 is constructed under the third-level database 103. In the fourth-level database 104, valves are further classified according to different valve opening values. In this embodiment, the valve opening values ​​of the first category of valves include 25%, 50%, 75%, and 100%, and the valve opening values ​​of the second category of valves include 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%.

[0051] As an example, in the fourth-level database 104, straight-through stop valves of DN20, DN25...DN250 are divided into four categories according to the valve opening values ​​of 25%, 50%, 75% and 100% respectively; right-angle stop valves of DN20, DN25...DN250 are divided into four categories according to the valve opening values ​​of 25%, 50%, 75% and 100% respectively; straight-through check valves of DN20, DN25...DN250 are divided into four categories according to the valve opening values ​​of 25%, 50%, 75% and 100% respectively. Door opening values ​​of 25%, 50%, 75% and 100% are divided into four categories; DN20, DN25...DN250 right-angle check valves are divided into four categories according to valve opening values ​​of 25%, 50%, 75% and 100% respectively; DN20, DN25...DN250 butterfly valves are divided into ten categories according to valve opening values ​​of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% respectively.

[0052] S5: constructing a fifth-level database under the fourth-level database. In the fifth-level database, different valve opening values ​​correspond to different flow resistance coefficients, thereby completing the construction of the flow resistance database.

[0053] As an example, each valve opening value corresponds to a flow resistance coefficient, and the flow resistance coefficient is inversely proportional to the valve opening. For example, the relationship between the valve opening value and the flow resistance coefficient of the first type of valve is as follows: Figure 3a As shown, the relationship between the valve opening value and the flow resistance coefficient of the second type of valve is as follows Figure 3b As shown. Figure 2 As shown, a fifth-level database 105 is constructed under the fourth-level database 104. In the fifth-level database 105, different valve opening values ​​correspond to different flow resistance coefficients, thereby completing the construction of the flow resistance database.

[0054] Example 2

[0055] This embodiment provides a method for calling a flow resistance database based on the opening of a ship valve. Figure 4 As shown, the following steps are included:

[0056] S1: Provide a first-class resistance database;

[0057] As an example, a flow resistance database is provided. The flow resistance database is the flow resistance database based on the ship valve opening provided in Example 1. For the specific content of the database, please refer to the description of Example 1 and will not be repeated here.

[0058] S2: Determine input parameters, including whether the valve has an opening indication, the purpose of the valve, the internal structure of the valve, the nominal diameter of the valve, and the flow resistance coefficient required by the valve;

[0059] As an example, determine the input parameters, refer to Figure 2As shown, first, a first- or second-category valve is selected in the first-level database 101. If the first-category valve is selected, the second-level database 102 is further used to determine whether to select a straight-through stop valve, a right-angle stop valve, a straight-through check valve, or a right-angle check valve. Next, the third-level database 103 is used to select an appropriate nominal diameter. Specifically, the nominal diameter is determined by the actual selection of valves during production and design. Finally, the desired flow resistance coefficient is selected in the fifth-level database 105. If the second-category valve is selected, a butterfly valve is first selected in the second-level database 102. Then, the third-level database 103 is used to select an appropriate nominal diameter. Finally, the fifth-level database 105 is used to select the desired flow resistance coefficient.

[0060] S3: In the flow resistance database, the corresponding valve opening value is obtained according to the input parameters to complete the call of the flow resistance database; if the corresponding valve opening value cannot be obtained according to the input parameters, the input parameters in step S2 are adjusted and the valve opening value is obtained again until it is successfully obtained.

[0061] As an example, through the above input parameters, the corresponding valve opening value can be found in the fourth-level database 104, thereby completing the call of the flow resistance database.

[0062] As an example, if the corresponding valve opening value cannot be obtained based on the above input parameters, the designer will make changes to the pipeline design, such as changing the pipeline diameter, adjusting the layout, selecting other valves, etc., which will cause the above input parameters to change; then, the valve opening value is re-obtained based on the changed input parameters until it is successfully obtained.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for constructing a flow resistance database based on ship valve opening, characterized in that: The steps include: S1: constructing a first-level database, in which ship valves are divided into first-category valves and second-category valves, wherein the first-category valves have no opening indication, and the second-category valves have an opening indication; S2: constructing a second-level database under the first-level database, wherein the first-type valves and the second-type valves are classified in the second-level database according to different uses of the valves, and the first-type valves are further classified according to different internal structures of the valves; S3: constructing a third-level database under the second-level database, wherein in the third-level database, various types of the first-type valves with different internal structures are classified according to different nominal diameters, and various types of the second-type valves with different uses are classified according to different nominal diameters; S4: Constructing a fourth-level database under the third-level database, in which the first-category valves and the second-category valves with different nominal diameters are classified according to different valve opening values; wherein, in the first-category valves, the valve opening values ​​include 25%, 50%, 75% and 100%, and the first-category valves with different nominal diameters are respectively divided into four categories according to the valve opening values ​​of 25%, 50%, 75% and 100% of the first-category valves; wherein, in the second-category valves, the valve opening values ​​include 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and the second-category valves with different nominal diameters are respectively divided into ten categories according to the valve opening values ​​of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% of the second-category valves; S5: constructing a fifth-level database under the fourth-level database. In the fifth-level database, different valve opening values ​​correspond to different flow resistance coefficients, thereby completing the construction of the flow resistance database.

2. The method for constructing a flow resistance database based on ship valve opening according to claim 1, characterized in that: In step S2, according to different uses of the valves, the first type of valves are divided into stop valves and check valves, and the second type of valves are butterfly valves.

3. The method for constructing a flow resistance database based on ship valve opening according to claim 2, characterized in that: In step S2, according to the different internal structures of the valves, the stop valve is divided into a straight-through valve and a right-angle valve, and the check valve is divided into a straight-through valve and a right-angle valve.

4. The method for constructing a flow resistance database based on ship valve opening according to claim 3, characterized in that: In step S3, the nominal diameters include DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN175, DN200, and DN250.

5. A method for calling a flow resistance database based on ship valve opening, characterized in that: The steps include: S1: Providing a flow resistance database, wherein the flow resistance database is a flow resistance database based on the opening of a ship valve as described in any one of claims 1 to 4; S2: Determine input parameters, including whether the valve has an opening indication, the purpose of the valve, the internal structure of the valve, the nominal diameter of the valve, and the required flow resistance coefficient of the valve; S3: In the flow resistance database, the corresponding valve opening value is obtained according to the input parameters to complete the call of the flow resistance database; if the corresponding valve opening value cannot be obtained according to the input parameters, the input parameters in step S2 are adjusted and the valve opening value is obtained again until it is successfully obtained.

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