Vacuum pump layout method, device and vacuum pipeline system

Abstract

The present invention provides a method and device for the layout of vacuum pumps and a vacuum pipeline system. The method includes: determining the pipe diameter and length of the vacuum pipeline according to the train operation route, train operation speed, cross-sectional area of the train, and specific heat ratio of the gas in the vacuum pipeline; meanwhile, determining the target pressure inside the pipe according to the train operation resistance and route construction cost. Then, taking the pipe diameter of the vacuum pipeline, the length of the vacuum pipeline, and the target pressure inside the pipe as inputs, iterative cyclic pumping is performed until the current pressure inside the pipe reaches the target pressure inside the pipe and the total pumping time is within the preset range, at which point the current vacuum pump spacing is output as the layout spacing of the vacuum pumps, and the number of vacuum pumps is determined according to the length of the vacuum pipeline. The present invention can not only ensure the uniformity of the gas inside the pipe, but also avoid the problem of poor economy caused by too many pipe openings, making the layout of the vacuum pumps reasonable and meeting the requirements of the operation safety and green economy of the low-vacuum pipeline train.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pipeline transportation, and particularly to a method and device for arranging vacuum pumps and a vacuum pipeline system. Background Art

[0002] A low-vacuum pipeline maglev train utilizes vacuum pipeline and superconducting magnetic levitation technologies to achieve high-speed near-ground flight. To ensure the low vacuum degree and its uniformity of the operating environment of the low-vacuum pipeline maglev train, multiple groups of vacuum pumps need to be arranged on the vacuum pipeline along the line.

[0003] Currently, it is mostly based on manual experience to evenly arrange multiple groups of vacuum pumps on the vacuum pipeline at a certain interval. However, in some scenarios, the interval between the vacuum pumps is too large, making it difficult to ensure the uniformity of the gas in the pipeline. In some scenarios, the interval between the vacuum pumps is too small, resulting in more openings in the pipeline, and thus poor economy. Summary of the Invention

[0004] The present invention provides a method and device for arranging vacuum pumps and a vacuum pipeline system to solve the defect of unreasonable layout of vacuum pumps in the prior art.

[0005] The present invention provides a method for arranging vacuum pumps, including:

[0006] Air extraction step: At the current vacuum pump interval, perform air extraction on the vacuum pipeline where the vacuum pump is located in the current stage, and when the current pressure of the vacuum pipeline reaches the current target pressure, based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage, determine the air extraction time of the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump interval and the diameter of the vacuum pipeline;

[0007] Statistics step: If the ending pressure in the current stage is greater than the target pressure inside the pipeline, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the air extraction step until the ending pressure in the current stage is less than or equal to the target pressure inside the pipeline, and then statistics the air extraction time of all current stages to obtain the total air extraction time;

[0008] Layout step: When the total air extraction time is greater than the first threshold and less than the second threshold, use the current vacuum pump interval as the layout interval of the vacuum pump.

[0009] According to the method for arranging vacuum pumps provided by the present invention, it further includes:

[0010] When the total pumping time is less than or equal to the first threshold, after increasing the current vacuum pump spacing, repeat the pumping step and the statistics step until the total pumping time is greater than the first threshold and less than the second threshold;

[0011] When the total pumping time is greater than or equal to the second threshold, after reducing the current vacuum pump spacing, repeat the pumping step and the statistics step until the total pumping time is greater than the first threshold and less than the second threshold.

[0012] According to a vacuum pump layout method provided by the present invention, the pumping time of the current stage is determined based on a pumping time model, and the pumping time model is:

[0013]

[0014] Wherein, t represents the pumping time of the current stage, V represents the pumped gas volume in the current stage, Se represents the effective pumping speed of the vacuum pump, P0 represents the starting pressure of the vacuum pipeline in the current stage, P0 is determined based on the starting pressure of the vacuum pipeline in the current stage, P represents the ending pressure of the vacuum pipeline in the current stage, and P is determined based on the ending pressure of the vacuum pipeline in the current stage.

[0015] According to a vacuum pump layout method provided by the present invention, taking the current vacuum pump spacing as the layout spacing of the vacuum pump, and then further including:

[0016] Determine the number of vacuum pumps based on the length of the vacuum pipeline and the layout spacing.

[0017] According to a vacuum pump layout method provided by the present invention, the target pipe internal pressure is determined based on the train running resistance and the route construction cost.

[0018] According to a vacuum pump layout method provided by the present invention, the diameter of the vacuum pipeline is determined based on the following steps:

[0019] Based on the train running route, determine the train running speed and the length of the vacuum pipeline;

[0020] Based on the cross-sectional area of the train, the train running speed, and the specific heat ratio of the gas in the vacuum pipeline, determine the diameter of the vacuum pipeline.

[0021] According to a vacuum pump layout method provided by the present invention, the determining the diameter of the vacuum pipeline based on the cross-sectional area of the train, the train running speed, and the specific heat ratio of the gas in the vacuum pipeline includes:

[0022] Based on the train running speed, determine the incoming flow Mach number;

[0023] When the oncoming flow Mach number is less than or equal to 1, the cross-sectional area of the vacuum pipeline is determined based on the first model; when the oncoming flow Mach number is greater than 1, the cross-sectional area of the vacuum pipeline is determined based on the second model;

[0024] Based on the cross-sectional area of the vacuum pipeline, the pipe diameter of the vacuum pipeline is determined;

[0025] The first model is:

[0026]

[0027] The second model is:

[0028]

[0029] where A 管道 represents the cross-sectional area of the vacuum pipeline, A 列车 represents the cross-sectional area of the train, Ma represents the oncoming flow Mach number, and γ represents the specific heat ratio of the gas in the vacuum pipeline.

[0030] The present invention also provides a vacuum pump layout device, including:

[0031] An air extraction unit for extracting air from the vacuum pipeline where the vacuum pump is located at the current vacuum pump spacing in the current stage, and when the current pressure in the vacuum pipeline reaches the current target pressure, determining the air extraction time of the current stage based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline;

[0032] A statistics unit for, if the ending pressure in the current stage is greater than the target pressure in the pipe, using the ending pressure in the current stage as the starting pressure in the next stage and repeating the steps of the air extraction unit until the ending pressure in the current stage is less than or equal to the target pressure in the pipe, and then statistics the air extraction time of all current stages to obtain the total air extraction time;

[0033] A layout unit for, when the total air extraction time is greater than the first threshold and less than the second threshold, using the current vacuum pump spacing as the layout spacing of the vacuum pump.

[0034] The present invention also provides a vacuum pipeline system, including:

[0035] A vacuum pipeline and a plurality of vacuum pumps;

[0036] Among them, the multiple vacuum pumps are arranged on the vacuum pipeline according to the vacuum pump layout method described in any one of the above.

[0037] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the vacuum pump layout method described in any one of the above is implemented.

[0038] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the vacuum pump layout method described in any one of the above is implemented.

[0039] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, the vacuum pump layout method described in any one of the above is implemented.

[0040] The vacuum pump layout method, device, and vacuum pipeline system provided by the present invention, when the end pressure in the current stage is less than or equal to the target pressure in the pipe, and the total pumping time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pumps. This can not only ensure the uniformity of the gas in the pipe, but also avoid the problem of poor economy caused by too many pipe openings, making the layout of the vacuum pumps reasonable and meeting the requirements of the operation safety and green economy of the low-vacuum pipeline train. Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 It is a schematic flowchart of the vacuum pump layout method provided by the present invention;

[0043] Figure 2 It is a schematic flowchart of another vacuum pump layout method provided by the present invention;

[0044] Figure 3 It is a schematic structural diagram of the vacuum pump layout device provided by the present invention;

[0045] Figure 4 It is a schematic layout diagram of the vacuum pipeline system provided by the present invention;

[0046] Figure 5 It is a schematic structural diagram of the electronic device provided by the present invention. Detailed Embodiments

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts fall within the scope of protection of the present invention.

[0048] In order to ensure the low vacuum degree and its uniformity of the operating environment of the low-vacuum pipeline maglev train, multiple groups of vacuum pumps need to be arranged along the vacuum pipeline. However, if the layout spacing of the vacuum pumps is too large, it is difficult to ensure the uniformity of the gas in the pipeline; if the layout spacing of the vacuum pumps is too small, the excessive number of vacuum pump groups will result in more pipeline openings, with poor economy. In addition, if the vacuum pumps are arranged too concentratedly, it will also increase the air extraction resistance of the pipeline, and even cause the connection pipe size of the vacuum pump group to be too large, making implementation difficult.

[0049] In response to this, the present invention provides a method for layout of vacuum pumps. Figure 1 is a schematic flowchart of the method for layout of vacuum pumps provided by the present invention, as Figure 1 shown, the method includes:

[0050] Step 110, air extraction step: Under the current vacuum pump spacing, perform air extraction on the vacuum pipeline where the vacuum pump is located in the current stage, and when the current pressure of the vacuum pipeline reaches the current target pressure, determine the air extraction time of the current stage based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline.

[0051] Here, the current vacuum pump spacing refers to the initial spacing of the vacuum pump in the current stage, and this spacing may be a reasonable spacing or an unreasonable spacing. The unreasonable spacing is divided into two cases. One is that the spacing is too large, making it difficult to ensure the uniformity of the gas in the pipeline; the other is that the spacing is too small, that is, the excessive number of vacuum pump groups will result in more pipeline openings, with poor economy. Among them, when the vacuum pipeline is first pumped, the corresponding current vacuum pump spacing can be given according to experience.

[0052] The current target pressure refers to the internal pressure that the vacuum pipeline needs to reach under the condition of air extraction in the current stage. For example, the current target pressure can be 1 / 10 of the starting pressure of the vacuum pipeline in the current stage.

[0053] The starting pressure of the vacuum pipeline at the current stage refers to the pressure inside the pipeline corresponding to the start of the pumping at the current stage, which can be used as the ending pressure of the vacuum pipeline at the previous stage. The ending pressure of the vacuum pipeline at the current stage refers to the pressure inside the pipeline corresponding to the end of the pumping at the current stage, which can be used as the starting pressure of the vacuum pipeline at the next stage. The effective pumping speed of the vacuum pump refers to the actual pumping speed of the vacuum pump, which varies with the inlet pressure, that is, the effective pumping speeds corresponding to different pumping stages are different. The pumped gas volume of the vacuum pump at the current stage refers to the pumped gas volume corresponding to the current vacuum pump spacing. When the current vacuum pump spacing is different, the corresponding pumped gas volumes are also different.

[0054] Furthermore, since the pumping time at the current stage is related to the starting pressure at the current stage, the ending pressure at the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump at the current stage, the pumping time corresponding to each pumping stage at the current vacuum pump spacing is different, and the pumping times corresponding to different current vacuum pump spacings are also different.

[0055] Optionally, a vacuum pump can be selected according to the type, composition, and dust and impurity content of the gas to be pumped, such as a Roots vacuum pump, a reciprocating vacuum pump, a water-ring vacuum pump, a rotary vane vacuum pump, etc., or a combined pump can be formed. For example: A Roots pump is a vacuum pump without internal compression and usually requires a fore pump (such as a rotary vane pump) to cooperate.

[0056] Step 120, statistical step: If the ending pressure at the current stage is greater than the target pressure inside the pipeline, then use the ending pressure at the current stage as the starting pressure at the next stage, and repeat the pumping step until the ending pressure at the current stage is less than or equal to the target pressure inside the pipeline. At this time, count the pumping times of all current stages to obtain the total pumping time.

[0057] Specifically, the target pressure inside the pipeline refers to the pressure inside the vacuum pipeline that needs to be finally achieved. If the ending pressure at the current stage is greater than the target pressure inside the pipeline, it indicates that the vacuum degree inside the vacuum pipeline does not meet the train operation requirements. Therefore, it is necessary to continue pumping the vacuum pipeline, that is, enter the pumping at the next stage. At this time, use the ending pressure at the current stage as the starting pressure at the next stage, and repeat step 110 until the ending pressure at the current stage is less than or equal to the target pressure inside the pipeline.

[0058] When the ending pressure at the current stage is less than or equal to the target pressure inside the pipeline, it indicates that the vacuum degree inside the vacuum pipeline meets the train operation requirements at this time. At this time, the pumping times of all current stages can be counted to obtain the total pumping time. That is, the total pumping time refers to the total pumping time required to make the pressure inside the vacuum pipeline reach the target pressure inside the pipeline at the current vacuum pump spacing.

[0059] Step 130, layout step: When the total air extraction time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pumps.

[0060] Specifically, if the total air extraction time is too long, it indicates that the layout spacing of the vacuum pumps is too large, making it difficult to ensure the uniformity of the gas in the pipe. In this case, it is necessary to reduce the current vacuum pump spacing; if the total air extraction time is too short, it indicates that the number of vacuum pumps is relatively large, which will further lead to more pipe openings and poor economy. In this case, it is necessary to increase the current vacuum pump spacing to reduce the number of vacuum pumps.

[0061] If the total air extraction time is greater than the first threshold and less than the second threshold, it indicates that at the current vacuum pump spacing, the layout of the vacuum pumps is reasonable, and the current vacuum pump spacing can be used as the layout spacing of the vacuum pumps. At this layout spacing, both the uniformity of the gas in the pipe can be ensured, and the problem of poor economy caused by too many pipe openings can be avoided. Among them, the first threshold and the second threshold can be specifically set according to the actual situation, and the embodiments of the present invention do not make specific limitations on this.

[0062] The vacuum pump layout method provided by the embodiments of the present invention, when the end pressure in the current stage is less than or equal to the target in-pipe pressure, and the total air extraction time is greater than the first threshold and less than the second threshold, uses the current vacuum pump spacing as the layout spacing of the vacuum pumps, which can not only ensure the uniformity of the gas in the pipe, but also avoid the problem of poor economy caused by too many pipe openings, making the layout of the vacuum pumps reasonable and meeting the requirements of the operation safety and green economy of the low-vacuum pipeline train.

[0063] Based on the above implementation, the method further includes:

[0064] When the total air extraction time is less than or equal to the first threshold, after increasing the current vacuum pump spacing, repeat the air extraction step and the statistics step until the total air extraction time is greater than the first threshold and less than the second threshold;

[0065] When the total air extraction time is greater than or equal to the second threshold, after reducing the current vacuum pump spacing, repeat the air extraction step and the statistics step until the total air extraction time is greater than the first threshold and less than the second threshold.

[0066] Specifically, if the total air extraction time is less than or equal to the first threshold, it indicates that the total air extraction time is too short, that is, the number of vacuum pumps is relatively large, which will lead to more pipe openings and poor economy. In this case, it is necessary to increase the current vacuum pump spacing to reduce the number of vacuum pumps, and repeat the air extraction step and the statistics step according to the method of the above embodiment until the total air extraction time is greater than the first threshold and less than the second threshold.

[0067] If the total pumping time is greater than or equal to the second threshold, it indicates that the total pumping time is too long, that is, the layout spacing of the vacuum pumps is too large, making it difficult to ensure the uniformity of the gas in the pipe. At this time, it is necessary to reduce the current spacing between the vacuum pumps, and repeat the pumping step and the statistical step according to the method of the above embodiment until the total pumping time is greater than the first threshold and less than the second threshold.

[0068] Based on any of the above embodiments, the pumping time at the current stage is determined based on the pumping time model, and the pumping time model is:

[0069]

[0070] Wherein, t represents the pumping time at the current stage, V represents the pumped volume at the current stage, Se represents the effective pumping speed of the vacuum pump, P0 represents the starting pressure of the vacuum pipeline at the current stage, P0 is determined based on the starting pressure of the vacuum pipeline at the current stage, P represents the ending pressure of the vacuum pipeline at the current stage, and P is determined based on the ending pressure of the vacuum pipeline at the current stage.

[0071] Specifically, the effective pumping speed of the vacuum pump changes with the inlet pressure. Since the starting pressure and the ending pressure corresponding to different stages are different, the starting pressure and the ending pressure corresponding to different stages are also different. That is, at the current spacing between the vacuum pumps, the effective pumping speeds corresponding to different pumping stages are different. The pumped volume of the vacuum pump at the current stage refers to the pumped volume corresponding to the current spacing between the vacuum pumps. When the current spacing between the vacuum pumps is different, the corresponding pumped volumes are also different.

[0072] After determining the effective pumping speed of the vacuum pump, the pumping time at the current stage can be obtained according to the pumped volume and the effective pumping speed at the current stage. It can be understood that since the effective pumping speeds corresponding to each pumping stage are different at the current spacing between the vacuum pumps, the pumping times corresponding to each pumping stage are also different.

[0073] Since the pumping times corresponding to each pumping stage are different, in order to accurately obtain the total pumping time, multiple pumping stages can be divided at the current spacing between the vacuum pumps. The more pumping stages there are, the closer the calculated total pumping time is to the actual pumping time. For example, the initial pressure of the vacuum pipeline is Pa, and the target pressure in the pipe is Pb, that is, it is necessary to calculate the total pumping time for reducing Pa to Pb. At this time, the pressure section from Pa to Pb can be divided into n segments. The more segments there are, the closer the calculated total pumping time is to the actual pumping time.

[0074] Based on any of the above embodiments, taking the current spacing between the vacuum pumps as the layout spacing of the vacuum pumps, the following further includes:

[0075] Determine the number of vacuum pumps based on the length of the vacuum pipeline and the layout spacing.

[0076] Specifically, the layout spacing of the vacuum pumps is a reasonable layout spacing. At this time, the vacuum pumps can be evenly arranged on the vacuum pipeline according to this layout spacing. That is, according to the length of the vacuum pipeline and the layout spacing, the number of vacuum pumps can be determined. Furthermore, based on the number of vacuum pumps and the layout spacing, the layout of the vacuum pumps on the vacuum pipeline can be completed.

[0077] Based on any of the above embodiments, the target pressure inside the pipe is determined based on the train running resistance and the route construction cost.

[0078] Specifically, the train running resistance is related to the operation cost. The operation cost is mainly related to consumables, labor, and fuel for overcoming the running resistance. And the gas density inside the pipe is proportional to the running resistance. Therefore, appropriately reducing the gas density inside the pipe can effectively control the operation cost. However, the gas density inside the pipe cannot be infinitely reduced. An overly small gas density inside the pipe poses higher requirements for pipeline sealing, resulting in a higher route construction cost.

[0079] In the embodiment of the present invention, the target pressure inside the pipe is determined based on the train running resistance and the route construction cost. That is, not only the running requirements of the train are considered, but also the economic issues are taken into account, making the completed layout of the vacuum pumps meet the requirements of the low-vacuum pipeline train for safe, stable, green, and economic operation.

[0080] Based on any of the above embodiments, the diameter of the vacuum pipeline is determined according to the following steps:

[0081] Based on the train running route, determine the train running speed and the length of the vacuum pipeline;

[0082] Based on the cross-sectional area of the train, the train running speed, and the specific heat ratio of the gas inside the vacuum pipeline, determine the diameter of the vacuum pipeline.

[0083] Specifically, the train running route is used to characterize the section information during the train operation, such as the running length, running environment, etc. According to the train running route, the train running speed and the length of the vacuum pipeline can be determined.

[0084] Through the train running speed, in order to avoid the aerodynamic effect of flow choking, according to the train running speed and the specific heat ratio of the gas inside the vacuum pipeline, the applicable blockage ratio at the train running speed can be deduced. And the blockage ratio is directly related to the cross-sectional area of the vacuum pipeline and the cross-sectional area of the train. Based on this, the diameter (i.e., the inner diameter) of the vacuum pipeline can be obtained.

[0085] Based on any of the above embodiments, determining the diameter of the vacuum pipeline based on the cross-sectional area of the train, the train running speed, and the specific heat ratio of the gas inside the vacuum pipeline includes:

[0086] Based on the train running speed, determine the incoming flow Mach number;

[0087] When the incoming flow Mach number is less than or equal to 1, determine the cross-sectional area of the vacuum pipeline based on the first model; when the incoming flow Mach number is greater than 1, determine the cross-sectional area of the vacuum pipeline based on the second model.

[0088] Determine the pipe diameter of the vacuum pipeline based on the cross-sectional area of the vacuum pipeline.

[0089] The first model is:

[0090]

[0091] The second model is:

[0092]

[0093] where A 管道 represents the cross-sectional area of the vacuum pipeline, A 列车 represents the cross-sectional area of the train, Ma represents the incoming flow Mach number, and γ represents the specific heat ratio of the gas in the vacuum pipeline.

[0094] Specifically, the incoming flow Mach number refers to the ratio of the train running speed to the speed of sound. When the incoming flow Mach number is less than or equal to 1, determine the cross-sectional area of the vacuum pipeline based on the first model; when the incoming flow Mach number is greater than 1, determine the cross-sectional area of the vacuum pipeline based on the second model.

[0095] Based on any of the above embodiments, the present invention also provides a method for arranging vacuum pumps, as Figure 2 shown, the method includes:

[0096] First, determine the train running speed, and determine the inner diameter of the vacuum pipeline according to the isentropic theory or the Kantrowitz limit theory. At the same time, determine the pipeline length according to the train running route, and determine the target pressure inside the pipe according to the train operation cost and the route construction cost.

[0097] Next, set the initial spacing of the vacuum pumps, and use the initial spacing as the current vacuum pump spacing, and determine the pumping volume of the vacuum pumps at the current stage according to the current vacuum pump spacing and the inner diameter of the vacuum pipeline.

[0098] Then, select a type of vacuum pump and perform pumping using the staged pumping method. The pumping target requirement for each stage is to reduce the current pressure of the vacuum pipeline to 1 / 10 of the starting pressure of this stage. After the current pressure is less than or equal to the target pressure inside the pipe, calculate the pumping time for each stage according to the pumping volume of the vacuum pumps at each stage and the effective pumping speed of the vacuum pumps, and count the pumping time of all stages to obtain the total pumping time.

[0099] After obtaining the total pumping time, if the total pumping time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pumps, and determine the number of vacuum pumps in combination with the pipeline length to complete the layout design of the pumping station. Otherwise, adjust the current vacuum pump spacing and perform staged pumping according to the above method until the total pumping time is greater than the first threshold and less than the second threshold.

[0100] The vacuum pump layout device provided by the present invention will be described below. The vacuum pump layout device described below can be correspondingly referred to the vacuum pump layout method described above.

[0101] Based on any of the above embodiments, the present invention further provides a vacuum pump layout device, as Figure 3 shown, the device includes:

[0102] An air extraction unit 310, configured to perform current-stage air extraction on the vacuum pipeline where the vacuum pump is located at the current vacuum pump spacing, and when the current pressure of the vacuum pipeline reaches the current target pressure, determine the air extraction time of the current stage based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline;

[0103] A statistics unit 320, configured to, if the ending pressure in the current stage is greater than the target pressure inside the pipe, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the steps of the air extraction unit until the ending pressure in the current stage is less than or equal to the target pressure inside the pipe, and then statistics the air extraction time of all current stages to obtain the total air extraction time;

[0104] A layout unit 330, configured to, when the total air extraction time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pumps.

[0105] Based on any of the above embodiments, the device further includes an adjustment unit, configured to:

[0106] When the total air extraction time is less than or equal to the first threshold, after increasing the current vacuum pump spacing, repeat the air extraction step and the statistics step until the total air extraction time is greater than the first threshold and less than the second threshold;

[0107] When the total air extraction time is greater than or equal to the second threshold, after decreasing the current vacuum pump spacing, repeat the air extraction step and the statistics step until the total air extraction time is greater than the first threshold and less than the second threshold.

[0108] Based on any of the above embodiments, the pumping time at the current stage is determined based on a pumping time model, and the pumping time model is as follows:

[0109]

[0110] Wherein, t represents the pumping time at the current stage, V represents the pumped gas volume at the current stage, Se represents the effective pumping speed of the vacuum pump, P0 represents the starting pressure of the vacuum pipeline at the current stage, P0 is determined based on the starting pressure of the vacuum pipeline at the current stage, P represents the ending pressure of the vacuum pipeline at the current stage, and P is determined based on the ending pressure of the vacuum pipeline at the current stage.

[0111] Based on any of the above embodiments, the device further includes:

[0112] A calculation unit, configured to, after using the current distance between vacuum pumps as the layout distance of the vacuum pumps, determine the number of vacuum pumps based on the length of the vacuum pipeline and the layout distance.

[0113] Based on any of the above embodiments, the target pressure inside the pipe is determined based on the train operation resistance and the route construction cost.

[0114] Based on any of the above embodiments, the device further includes:

[0115] A length determination unit, configured to determine the train operation speed and the length of the vacuum pipeline based on the train operation route;

[0116] A pipe diameter determination unit, configured to determine the pipe diameter of the vacuum pipeline based on the cross-sectional area of the train, the train operation speed, and the specific heat ratio of the gas inside the vacuum pipeline.

[0117] Based on any of the above embodiments, the pipe diameter determination unit includes:

[0118] A first calculation unit, configured to determine the incoming flow Mach number based on the train operation speed;

[0119] An area determination unit, configured to, when the incoming flow Mach number is less than or equal to 1, determine the cross-sectional area of the vacuum pipeline based on a first model; when the incoming flow Mach number is greater than 1, determine the cross-sectional area of the vacuum pipeline based on a second model;

[0120] A second calculation unit, configured to determine the pipe diameter of the vacuum pipeline based on the cross-sectional area of the vacuum pipeline;

[0121] The first model is:

[0122]

[0123] The second model is as follows:

[0124]

[0125] where A 管道 represents the cross-sectional area of the vacuum pipeline, A 列车 represents the cross-sectional area of the train, Ma represents the incoming flow Mach number, and γ represents the specific heat ratio of the gas in the vacuum pipeline.

[0126] Based on any of the above embodiments, the present invention further provides a vacuum pipeline system, including:

[0127] a vacuum pipeline and a plurality of vacuum pumps;

[0128] wherein, the plurality of vacuum pumps are arranged on the vacuum pipeline according to the vacuum pump layout method described in any of the above embodiments.

[0129] As Figure 4 shown, the number of vacuum pumps is calculated according to the pipeline length, and the vacuum pumps are arranged on the vacuum pipeline according to the layout spacing of the vacuum pumps to obtain a vacuum pipeline system.

[0130] Figure 5 is a schematic structural diagram of the electronic device provided by the present invention, as Figure 5As shown in the figure, the electronic device may include: a processor 510, a memory 520, a communication interface 530, and a communication bus 540. Among them, the processor 510, the memory 520, and the communication interface 530 complete communication with each other through the communication bus 540. The processor 510 may call the logical instructions in the memory 520 to execute the vacuum pump layout method, and the method includes: an air extraction step: at the current vacuum pump spacing, perform current-stage air extraction on the vacuum pipeline where the vacuum pump is located, and when the current pressure of the vacuum pipeline reaches the current target pressure, based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage, determine the air extraction time of the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline; a statistics step: if the ending pressure in the current stage is greater than the target pressure inside the pipe, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the air extraction step until the ending pressure in the current stage is less than or equal to the target pressure inside the pipe, and then statistics the air extraction time of all current stages to obtain the total air extraction time; a layout step: when the total air extraction time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pump.

[0131] In addition, when the logical instructions in the above-mentioned memory 520 can be implemented in the form of software functional units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0132] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the vacuum pump layout method provided by each of the above methods. The method includes: an air extraction step: at the current vacuum pump spacing, perform current-stage air extraction on the vacuum pipeline where the vacuum pump is located, and when the current pressure of the vacuum pipeline reaches the current target pressure, based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage, determine the air extraction time of the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline; a statistics step: if the ending pressure in the current stage is greater than the target pressure inside the pipe, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the air extraction step until the ending pressure in the current stage is less than or equal to the target pressure inside the pipe, then statistics the air extraction time of all current stages to obtain the total air extraction time; a layout step: when the total air extraction time is greater than a first threshold and less than a second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pump.

[0133] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the vacuum pump layout method provided by each of the above. The method includes: an air extraction step: at the current vacuum pump spacing, perform current-stage air extraction on the vacuum pipeline where the vacuum pump is located, and when the current pressure of the vacuum pipeline reaches the current target pressure, based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage, determine the air extraction time of the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline; a statistics step: if the ending pressure in the current stage is greater than the target pressure inside the pipe, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the air extraction step until the ending pressure in the current stage is less than or equal to the target pressure inside the pipe, then statistics the air extraction time of all current stages to obtain the total air extraction time; a layout step: when the total air extraction time is greater than a first threshold and less than a second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pump.

[0134] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0135] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for the layout of a vacuum pump, characterized in that, Including: Air extraction step: At the current vacuum pump spacing, perform air extraction on the vacuum pipeline where the vacuum pump is located in the current stage, and when the current pressure of the vacuum pipeline reaches the current target pressure, determine the air extraction time of the current stage based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the volume of air extracted by the vacuum pump in the current stage; the volume of air extracted by the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the diameter of the vacuum pipeline; Statistics step: If the ending pressure in the current stage is greater than the target pressure inside the pipe, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the air extraction step until the ending pressure in the current stage is less than or equal to the target pressure inside the pipe, then statistics the air extraction time of all current stages to obtain the total air extraction time; Layout step: When the total air extraction time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pump.

2. The method for the layout of a vacuum pump according to claim 1, wherein It further includes: When the total air extraction time is less than or equal to the first threshold, after increasing the current vacuum pump spacing, repeat the air extraction step and the statistics step until the total air extraction time is greater than the first threshold and less than the second threshold; When the total air extraction time is greater than or equal to the second threshold, after decreasing the current vacuum pump spacing, repeat the air extraction step and the statistics step until the total air extraction time is greater than the first threshold and less than the second threshold.

3. The vacuum pump layout method according to claim 1, wherein The air extraction time of the current stage is determined based on an air extraction time model, and the air extraction time model is: Where t represents the air extraction time of the current stage, V represents the volume of air extracted in the current stage, Se represents the effective pumping speed of the vacuum pump, P0 represents the starting pressure of the vacuum pipeline in the current stage, P0 is determined based on the starting pressure of the vacuum pipeline in the current stage, P represents the ending pressure of the vacuum pipeline in the current stage, and P is determined based on the ending pressure of the vacuum pipeline in the current stage.

4. The method for the layout of a vacuum pump according to claim 1, wherein After using the current vacuum pump spacing as the layout spacing of the vacuum pump, it further includes: Determine the number of vacuum pumps based on the length of the vacuum pipeline and the layout spacing.

5. The method for arranging a vacuum pump according to claim 1, wherein, The target pressure inside the pipe is determined based on the train operation resistance and the route construction cost.

6. The method for arranging a vacuum pump according to any one of claims 1 to 5, characterized in that, The diameter of the vacuum pipeline is determined based on the following steps: Based on the train operation route, determine the train operation speed and the length of the vacuum pipeline; Based on the cross-sectional area of the train, the train operation speed, and the specific heat ratio of the gas inside the vacuum pipeline, determine the diameter of the vacuum pipeline.

7. The method for arranging a vacuum pump according to claim 6, characterized in that, The determining of the diameter of the vacuum pipeline based on the cross-sectional area of the train, the train operation speed, and the specific heat ratio of the gas inside the vacuum pipeline includes: Based on the train operation speed, determine the incoming flow Mach number; When the incoming flow Mach number is less than or equal to 1, determine the cross-sectional area of the vacuum pipeline based on the first model; when the incoming flow Mach number is greater than 1, determine the cross-sectional area of the vacuum pipeline based on the second model; Based on the cross-sectional area of the vacuum pipeline, determine the pipe diameter of the vacuum pipeline; The first model is: The second model is: Among them, A 管道 represents the cross-sectional area of the vacuum pipeline, A 列车 represents the cross-sectional area of the train, Ma represents the incoming flow Mach number, and γ represents the specific heat ratio of the gas in the vacuum pipeline.

8. A vacuum pump layout device, characterized in that, Including: An air extraction unit, which is used to extract air from the vacuum pipeline where the vacuum pump is located at the current vacuum pump spacing in the current stage, and when the current pressure of the vacuum pipeline reaches the current target pressure, determine the air extraction time of the current stage based on the starting pressure of the vacuum pipeline in the current stage, the ending pressure of the vacuum pipeline in the current stage, the effective pumping speed of the vacuum pump, and the pumped gas volume of the vacuum pump in the current stage; the pumped gas volume of the vacuum pump in the current stage is determined based on the current vacuum pump spacing and the pipe diameter of the vacuum pipeline; A statistics unit, which is used to, if the ending pressure in the current stage is greater than the target pressure inside the pipe, use the ending pressure in the current stage as the starting pressure in the next stage, and repeat the steps of the air extraction unit until the ending pressure in the current stage is less than or equal to the target pressure inside the pipe, and then statistics the air extraction time of all current stages to obtain the total air extraction time; A layout unit, which is used to, when the total air extraction time is greater than the first threshold and less than the second threshold, use the current vacuum pump spacing as the layout spacing of the vacuum pump.

9. A vacuum pipeline system, characterized in that, Including: A vacuum pipeline and multiple vacuum pumps; Among them, the multiple vacuum pumps are arranged on the vacuum pipeline according to the vacuum pump layout method described in any one of claims 1 to 7.

10. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the vacuum pump layout method described in any one of claims 1 to 7.

Images