Method for preventing freezing of vehicle piping and vehicle piping for preventing freezing

Abstract

The present disclosure provides a vehicle pipeline anti-freezing method and a vehicle anti-freezing pipeline, which can be applied to the technical field of pipeline anti-freezing. The vehicle pipeline anti-freezing method comprises: constructing a pipeline heat transfer constraint condition according to a pipeline heat transfer parameter of a target vehicle and an operating environment parameter of the target vehicle, wherein the pipeline heat transfer constraint condition represents a constraint relationship between a heat transfer power of a heating assembly and a fluid in a pipeline and a heat transfer power between the fluid in the pipeline and an external environment; obtaining a distance threshold between adjacent heating assemblies pre-installed on the pipeline of the target vehicle based on the pipeline heat transfer constraint condition; wherein the distance threshold represents a maximum interval distance between the adjacent heating assemblies; generating a target installation position of the heating assembly based on the distance threshold and pipeline space information of the target vehicle; and installing the heating assembly on the pipeline of the target vehicle according to the target installation position.

Description

Technical Field

[0001] This disclosure relates to the field of pipeline antifreeze technology, specifically to a method for antifreeze vehicle pipelines and a vehicle antifreeze pipeline. Background Technology

[0002] In related technologies, the common method for preventing vehicle piping from freezing is to wrap the outside of the piping with heat tracing and insulation materials to prevent the fluid inside the piping from freezing due to excessively low temperature when the vehicle is running in a low-temperature environment, which could damage the piping inside the vehicle and the related equipment connected to the piping.

[0003] However, in the process of realizing the concept of this invention, the inventors discovered that: due to the complexity of the equipment inside the vehicle, the pipeline passes through the gaps in the complex equipment, and the amount of heat tracing material wrapped around it is generally estimated based on prior experience. In general, excessive heat tracing material is used to ensure the fluid temperature in the pipeline, which not only wastes heat tracing material, but also affects the daily maintenance of the pipeline. Summary of the Invention

[0004] In view of the above problems, this disclosure provides a method for preventing vehicle pipelines from freezing and a vehicle antifreeze pipeline.

[0005] According to one aspect of this disclosure, a method for preventing freezing of vehicle piping is provided, comprising: constructing piping heat transfer constraints based on piping heat transfer parameters and operating environment parameters of the target vehicle, wherein the piping heat transfer constraints characterize the constraint relationship between the heat transfer power between the heating components and the fluid in the piping and the heat transfer power between the fluid in the piping and the external environment; obtaining a distance threshold between adjacent heating components pre-installed on the piping of the target vehicle based on the piping heat transfer constraints; wherein the distance threshold characterizes the maximum spacing distance between adjacent heating components; generating a target installation position for the heating components based on the distance threshold and piping space information of the target vehicle; and installing the heating components on the piping of the target vehicle according to the target installation position.

[0006] According to embodiments of this disclosure, a pipeline heat transfer constraint condition is constructed based on the pipeline heat transfer parameters of the target vehicle and the operating environment parameters of the target vehicle, including: obtaining the fluid freezing temperature and the pipeline end temperature from the operating environment parameters; and constructing the pipeline heat transfer constraint condition based on the fluid freezing temperature, the pipeline end temperature and the pipeline heat transfer parameters of the target vehicle.

[0007] According to embodiments of this disclosure, a pipeline heat transfer constraint condition is constructed based on the fluid freezing temperature, the pipeline end temperature, and the pipeline heat transfer parameters of the target vehicle. This includes: determining the fluid freezing temperature as a threshold value for the temperature equilibrium point between adjacent heating components; determining the pipeline end temperature as a threshold value for the operating temperature of the heating components; and constructing the pipeline heat transfer constraint condition based on the threshold value for the temperature equilibrium point, the operating temperature threshold value, and the pipeline heat transfer parameters of the target vehicle.

[0008] According to embodiments of this disclosure, the operating environment parameters include the minimum ambient temperature; the pipeline heat transfer parameters include: the thermal conductivity of the pipeline material, the thermal conductivity of the fluid, the thermal conductivity of the insulation material, the pipeline dimensions, and the thickness of the insulation material.

[0009] According to embodiments of this disclosure, pipeline heat transfer constraints are constructed based on the threshold of the temperature equilibrium point, the operating temperature threshold, and the pipeline heat transfer parameters of the target vehicle. This includes: obtaining the heat transfer power between the heating components and the fluid within the pipeline based on the thermal conductivity of the pipeline material, the thermal conductivity of the fluid material, the pipeline size, the operating temperature threshold, the threshold of the equilibrium point temperature, and the undetermined interval distance between adjacent heating components; obtaining the heat transfer power between the fluid within the pipeline and the external environment based on the thermal conductivity of the insulation material, the pipeline size, the minimum ambient temperature, and the thickness of the insulation material; and constructing pipeline heat transfer constraints based on the heat transfer power between the heating components and the fluid within the pipeline and the heat transfer power between the fluid within the pipeline and the external environment.

[0010] According to embodiments of this disclosure, based on pipeline heat transfer constraints, a distance threshold between adjacent heating components pre-installed on a target vehicle is obtained, including: obtaining the maximum value of a predetermined interval distance between adjacent heating components when it is determined that the heat transfer power between the heating component and the fluid in the pipeline is equal to the heat transfer power between the fluid in the pipeline and the external environment; and determining the maximum value of the predetermined interval distance as the distance threshold.

[0011] According to embodiments of this disclosure, the pipeline of the target vehicle may include multiple pipelines of different materials. The method further includes: for pipelines of the first material, obtaining a first distance threshold between adjacent heating components on the pipeline of the first material based on the heat transfer parameters and heat transfer constraints of the pipeline of the first material; for pipelines of the second material, obtaining a second distance threshold between adjacent heating components on the pipeline of the first material based on the heat transfer parameters and heat transfer constraints of the pipeline of the second material; and determining the minimum value between the first distance threshold and the second distance threshold as the distance threshold between adjacent heating components at the connection between the pipeline of the first material and the pipeline of the second material.

[0012] According to embodiments of this disclosure, a target installation location for a heating component is generated based on a distance threshold and the pipeline space information of the target vehicle, including: obtaining candidate installation locations for the heating component based on the pipeline space information of the target vehicle; generating multiple candidate installation schemes based on multiple candidate installation locations and pipeline lengths; evaluating the installation difficulty of the multiple candidate installation schemes to obtain an evaluation value; and determining the target installation location corresponding to the target installation scheme from the multiple candidate installation schemes based on the evaluation value.

[0013] According to embodiments of this disclosure, obtaining candidate installation locations for heating components based on pipeline space information of a target vehicle includes: determining the size of an obstacle device on the pipeline where the heating component is to be installed based on the pipeline space information of the target vehicle; and obtaining multiple candidate installation locations based on the size of the obstacle device and a distance threshold.

[0014] According to embodiments of this disclosure, the method further includes: determining fluid flow parameters in the pipeline from the operating environment parameters of the target vehicle; modifying the pipeline heat transfer constraint conditions based on the fluid flow parameters in the pipeline to obtain modified pipeline heat transfer constraint conditions; and obtaining a distance threshold between adjacent heating components pre-installed on the pipeline of the target vehicle based on the modified pipeline heat transfer constraint conditions.

[0015] According to embodiments of this disclosure, the heat transfer constraint conditions of the pipeline are modified based on the fluid flow parameters within the pipeline to obtain modified heat transfer constraint conditions. This includes: obtaining the fluid flow heat transfer power within the pipeline based on the fluid flow parameters within the pipeline; and obtaining the modified heat transfer constraint conditions based on the fluid flow heat transfer power, the heat transfer power between the heating component and the fluid within the pipeline, and the heat transfer power between the fluid within the pipeline and the external environment.

[0016] According to another aspect of this disclosure, a vehicle antifreeze pipeline is provided, comprising: a pipeline; wherein a plurality of heating components are disposed on the pipeline, wherein the installation positions of the plurality of heating components on the pipeline are determined according to the above-described vehicle pipeline antifreeze method.

[0017] According to embodiments of this disclosure, the spacing between adjacent heating components in a plurality of heating components is equal.

[0018] According to embodiments of this disclosure, since the pipeline heat transfer constraint conditions are constructed based on the pipeline heat transfer parameters and operating environment parameters of the target vehicle, reflecting the constraint relationship between the heat transfer power between the heating components and the fluid in the pipeline and the heat transfer power between the fluid in the pipeline and the external environment, the distance threshold between adjacent heating components obtained based on the pipeline heat transfer constraint conditions can accurately determine the reasonable installation position of the heating components installed on the pipeline. This allows for heat transfer to the fluid in the pipeline through the heating components, effectively compensating for heat loss due to the temperature difference between the inside and outside of the pipeline, and achieving the technical effect of preventing the fluid in the pipeline from solidifying. Furthermore, since the heating components are installed intermittently on the pipeline, normal pipeline maintenance will not be affected. Attached Figure Description

[0019] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 This diagram schematically illustrates an application scenario of an antifreeze method for vehicle piping according to an embodiment of the present disclosure.

[0021] Figure 2 A flowchart illustrating an antifreeze method for vehicle piping according to some embodiments of the present disclosure is shown.

[0022] Figure 3 A schematic diagram illustrating the installation position of the heating assembly according to an embodiment of the present disclosure is shown.

[0023] Figure 4 The flowchart illustrates a method for generating a target installation location for a heating assembly based on a distance threshold and pipeline space information of a target vehicle, according to an embodiment of the present disclosure.

[0024] Figure 5 A schematic diagram illustrating the installation location of a heating assembly according to other embodiments of the present disclosure is shown.

[0025] Figure 6 A flowchart illustrating an antifreeze method for vehicle piping according to other embodiments of the present disclosure is shown schematically; and

[0026] Figure 7 A schematic diagram of a vehicle antifreeze piping system according to an embodiment of the present disclosure is shown. Detailed Implementation

[0027] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0029] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0030] When using expressions such as "at least one of A, B, and C", they should generally be interpreted in accordance with the meaning that is commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B, and C, etc.).

[0031] In the technical solution of this invention, the user information (including but not limited to user personal information, user image information, user device information, such as location information) and data (including but not limited to data used for analysis, stored data, and displayed data) involved are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, storage, use, processing, transmission, provision, disclosure, and application of related data all comply with the relevant laws, regulations, and standards of the relevant countries and regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entry points for users to choose to authorize or refuse.

[0032] Due to the complexity of the equipment inside the vehicle, and the fact that pipelines pass through the gaps between these complex devices, the available space between the pipelines wrapped with heat tracing material and the equipment is quite narrow. Therefore, when performing pipeline maintenance or equipment disassembly, it is necessary to remove the heat tracing material and then re-wrap it after the maintenance. This creates obstacles for pipeline or equipment maintenance and disassembly work.

[0033] In addition, the amount of heat tracing material used is generally estimated based on prior experience, and excessive heat tracing material is often used to ensure the fluid temperature in the pipeline. This results in the inability to take accurate antifreeze measures for different operating conditions, leading to a waste of heat tracing material.

[0034] In view of this, the embodiments of this disclosure provide a method for preventing freezing of vehicle pipelines. Based on the distance threshold between adjacent heating components obtained from pipeline heat transfer constraints, the reasonable installation position of the heating components installed on the pipeline can be determined more accurately. This allows the heating components to transfer heat to the fluid in the pipeline, effectively compensating for heat loss caused by the temperature difference between the inside and outside of the pipeline, and thus preventing the fluid in the pipeline from solidifying. Furthermore, since the heating components are installed at intervals on the pipeline, normal pipeline maintenance will not be affected.

[0035] Figure 1 The illustration shows an application scenario of the antifreeze method for vehicle piping according to an embodiment of the present disclosure.

[0036] like Figure 1 As shown, in the application scenario of embodiment 100, the pipeline 120 of the target vehicle 110 may include a pipeline segment 140 exposed outside the equipment and a pipeline segment 150 hidden inside the equipment. A heater 130 can be installed on the pipeline segment 140 exposed outside the equipment to supplement heat into the pipeline and prevent the fluid in the pipeline 120 from freezing, which would damage the equipment and prevent the target vehicle from operating normally.

[0037] Figure 2 A flowchart illustrating an antifreeze method for vehicle piping according to an embodiment of the present disclosure is shown.

[0038] like Figure 2 As shown, the antifreeze method for vehicle pipelines in this embodiment 200 includes operations S210 to S240.

[0039] In operation S210, pipeline heat transfer constraints are constructed based on the pipeline heat transfer parameters of the target vehicle and the operating environment parameters of the target vehicle.

[0040] In operation S220, based on the pipeline heat transfer constraint, the distance threshold between adjacent heating components on the pipeline pre-installed in the target vehicle is obtained.

[0041] In operation S230, the target installation location of the heating component is generated based on the distance threshold and the pipeline space information of the target vehicle.

[0042] In operation S240, the heating components are installed on the pipeline of the target vehicle according to the target installation location.

[0043] According to embodiments of this disclosure, the target vehicle may include vehicles with complex internal structures such as rail vehicles and special vehicles. In the pipelines of the target vehicle, fluid flows along the pipelines into a terminal device, which may be, for example, a sensor-operated faucet inside the vehicle's passenger compartment. When the target vehicle operates in a low-temperature environment, due to the temperature difference between the inside and outside of the pipeline, the fluid inside the pipeline dissipates heat to the outside, causing heat loss and resulting in the fluid temperature at the outlet of the terminal device falling below the required temperature threshold. Even worse, when excessive heat loss occurs, causing the fluid temperature to drop to its freezing point, the fluid inside the pipeline freezes.

[0044] Therefore, when using heating components to supplement the heat of the fluid in the pipeline, it is necessary not only to ensure that the temperature of the fluid in the pipeline is higher than its freezing temperature, but also to ensure that the temperature of the fluid at the end of the pipeline meets the temperature requirements of the end equipment.

[0045] According to embodiments of this disclosure, pipeline heat transfer parameters may include: thermal conductivity of pipeline material, thermal conductivity of fluid, thermal conductivity of insulation material, inner diameter of pipeline, outer diameter of pipeline, and thickness of insulation material, etc.

[0046] According to embodiments of this disclosure, operating environment parameters may include minimum ambient temperature, fluid freezing temperature, and pipe end temperature. The minimum ambient temperature may be the lowest temperature of the environment in which the target vehicle's piping is located. The fluid freezing temperature can be determined based on fluid properties; for example, if the fluid is water and water's freezing temperature is 0°C, then the fluid freezing temperature may be 0 ± 0.5°C, where 0.5°C is a pre-set temperature fluctuation range. The pipe end temperature can be determined based on the operating temperature of the end device; for example, if the end device is a sensor faucet, the pipe end temperature may be 35 ± 2°C.

[0047] According to embodiments of this disclosure, a constraint relationship can be established between the heat transfer power between the heating component and the fluid in the pipeline and the heat transfer power between the fluid in the pipeline and the external environment, based on the pipeline heat transfer parameters and the operating environment parameters of the target vehicle. When the heat transfer power between the heating component and the fluid in the pipeline is equal to the heat transfer power between the fluid in the pipeline and the external environment, it indicates that the heat replenished by the installed heating component for the fluid is equal to the heat lost by the fluid, thus achieving minimum compensation for fluid heat loss.

[0048] According to embodiments of this disclosure, the maximum spacing between adjacent heating components can be obtained when the heat transfer power between the heating component and the fluid in the pipe is equal to the heat transfer power between the fluid in the pipe and the external environment.

[0049] Due to the complexity of the equipment inside the target vehicle, the space available for installing heating components on the piping is limited. Therefore, it is necessary to determine the actual installation location of the heating components based on the piping space information of the target vehicle, and then install the heating components on the piping according to the actual installation location.

[0050] Figure 3 A schematic diagram illustrating the installation position of the heating assembly according to an embodiment of the present disclosure is shown.

[0051] like Figure 3 As shown, in embodiment 300, the maximum distance between adjacent heating components can be 50cm. However, the pipe length between device A301 and device B302 is 20cm, the width of device B is 30cm, and the pipe length between device B302 and device C303 is 20cm. Therefore, the target installation position of heating component a304 can be determined to be 5cm away from the left side of device B, and the target installation position of heating component b305 is 10cm away from the right side of device B. At this time, the distance between heating component a and heating component b is 45cm, which is less than the distance threshold, thus satisfying the pipe heat transfer constraint condition.

[0052] According to embodiments of this disclosure, since the pipeline heat transfer constraint conditions are constructed based on the pipeline heat transfer parameters and operating environment parameters of the target vehicle, reflecting the constraint relationship between the heat transfer power between the heating components and the fluid in the pipeline and the heat transfer power between the fluid in the pipeline and the external environment, the distance threshold between adjacent heating components obtained based on the pipeline heat transfer constraint conditions can accurately determine the reasonable installation position of the heating components installed on the pipeline. This allows for heat transfer to the fluid in the pipeline through the heating components, effectively compensating for heat loss due to the temperature difference between the inside and outside of the pipeline, and achieving the technical effect of preventing the fluid in the pipeline from solidifying. Furthermore, since the heating components are installed intermittently on the pipeline, normal pipeline maintenance will not be affected.

[0053] Based on the pipeline heat transfer parameters of the target vehicle and the operating environment parameters of the target vehicle, the pipeline heat transfer constraints are constructed, which may include the following operations: obtaining the fluid freezing temperature and pipeline end temperature from the operating environment parameters; and constructing the pipeline heat transfer constraints based on the fluid freezing temperature, pipeline end temperature and the pipeline heat transfer parameters of the target vehicle.

[0054] According to embodiments of this disclosure, after heating components are installed on the pipeline, the temperature at the midpoint between adjacent heating components is the lowest fluid temperature in that section of the pipeline. It is understood that if the temperature at this point is higher than the fluid freezing temperature, it can be determined that the fluid temperature in other parts of the pipeline is also higher than the fluid freezing temperature. Therefore, the fluid freezing temperature can be determined as the threshold for the temperature equilibrium point between adjacent heating components; that is, the lowest temperature at the midpoint between adjacent heating components is taken as the temperature equilibrium point. This threshold (minimum value) can be 1-2°C higher than the fluid freezing temperature. The fluctuation range of the temperature equilibrium point threshold can be adjusted according to actual operating conditions, and this disclosure does not specifically limit this range.

[0055] According to embodiments of this disclosure, a heating component is used to supplement the fluid in the pipeline with heat. The operating temperature threshold of the heating component must be less than or equal to the temperature at the end of the pipeline to prevent the temperature at the end of the pipeline from exceeding the maximum temperature used in the actual scenario due to excessive heat supplementation by the heating component. For example, the end device can be a sensor faucet. If the water temperature of the sensor faucet is higher than human body temperature, it will cause scalding to passengers. Therefore, the temperature at the end of the pipeline can be determined as the operating temperature threshold of the heating component. For example, if the temperature at the end of the pipeline is 35°C, the operating temperature threshold of the heating component can be 1-2°C lower than the temperature at the end of the pipeline. The fluctuation range of the operating temperature threshold of the heating component can be adjusted according to the actual working conditions, and this disclosure does not specifically limit it.

[0056] According to embodiments of this disclosure, by determining the fluid freezing temperature as a threshold value for the temperature equilibrium point between adjacent heating components and determining the pipe end temperature as a threshold value for the operating temperature of the heating components, the constructed pipe heat transfer constraint conditions can satisfy both the fluid freezing protection within the pipe and the fluid temperature at the pipe end to meet application requirements.

[0057] According to embodiments of this disclosure, the heat transfer power between the heating element and the fluid in the pipe can be obtained based on the thermal conductivity of the pipe material, the thermal conductivity of the fluid material, the pipe size, the operating temperature threshold, the equilibrium point temperature threshold, and the undetermined interval distance between adjacent heating elements.

[0058] According to embodiments of this disclosure, the pipe dimensions may include the outer diameter R and the inner diameter r. The heat transfer power Q1 between the heating element and the fluid inside the pipe can be obtained according to equation (1):

[0059] Q1 = K 管 π*(R 2 -r 2 (T) 热 -T 中 ) / (d / 2)+K 流 πr 2 (T 热-T 中 ) / (d / 2) (1)

[0060] Among them, K 管 K represents the thermal conductivity of the pipe material. 流 R represents the thermal conductivity of the fluid material; R represents the outer diameter of the pipe; r represents the inner diameter of the pipe; T represents the inner diameter of the pipe. 热 Indicates the operating temperature threshold; T 中 The threshold value represents the equilibrium temperature; d represents the distance between adjacent heating elements.

[0061] According to embodiments of this disclosure, the heat transfer power between the fluid in the pipe and the external environment is obtained based on the thermal conductivity of the insulation material, the pipe size, the lowest ambient temperature, and the thickness of the insulation material.

[0062] For example, the heat transfer power Q2 between the fluid in the pipe and the external environment can be obtained according to equation (2):

[0063] Q2 = K 保 π*R 2 ((T 热 +T 中 ) / 2-T 环 ) / τ (2)

[0064] Among them, K 保 R represents the thermal conductivity of the insulation material; R represents the outer diameter of the pipe; r represents the inner diameter of the pipe; T 热 Indicates the operating temperature threshold; T 中 The threshold temperature representing the equilibrium point; T 环 τ represents the lowest ambient temperature; τ represents the thickness of the insulation material.

[0065] According to embodiments of this disclosure, the pipeline heat transfer constraint condition characterizes the constraint relationship between the heat transfer power between the heating component and the fluid in the pipeline and the heat transfer power between the fluid in the pipeline and the external environment. The constraint condition may be: the heat supplied by the heating component to the fluid in the pipeline is greater than or equal to the heat loss of the fluid in the pipeline to the external environment, i.e., Q1 is greater than or equal to Q2.

[0066] According to embodiments of this disclosure, obtaining a distance threshold between adjacent heating components pre-installed on a pipeline in a target vehicle based on pipeline heat transfer constraints may include the following operations: obtaining a maximum value of a predetermined interval distance between adjacent heating components when it is determined that the heat transfer power between the heating component and the fluid in the pipeline is equal to the heat transfer power between the fluid in the pipeline and the external environment; and determining the maximum value of the predetermined interval distance as the distance threshold.

[0067] Understandably, since the temperature is lowest at the midpoint between adjacent heating components, this point can be used as the temperature equilibrium point. Based on this equilibrium point, the heat transfer constraint for the pipeline can be determined as follows: the distance between adjacent heating components is maximized when the heat transfer power between the heating components and the fluid in the pipeline is equal to the heat transfer power between the fluid in the pipeline and the external environment. Under the current operating environment, the lowest temperature at the midpoint between adjacent heating components needs to compensate for the heat transfer power between the fluid in the pipeline and the external environment to ensure that the fluid in the pipeline does not freeze and that the temperature at the end of the pipeline meets the usage requirements of the terminal equipment.

[0068] According to embodiments of this disclosure, a distance threshold between adjacent heat transfer components is obtained based on the heat transfer constraint of the temperature equilibrium point, thereby enabling a more accurate determination of the installation position of the heating component on the pipeline.

[0069] According to the embodiments of this disclosure, the pipeline heat transfer constraint conditions described above are calculated based on pipelines of the same material. It is understood that when the pipeline material and the insulation material of the target vehicle are the same, the pipeline heat transfer constraint conditions obtained by formulas (1) and (2) can be used to obtain the distance threshold between adjacent heating components.

[0070] However, in practical application scenarios, especially in rail transit vehicles with complex pipelines, the pipelines can be made of various materials. Therefore, based on the pipeline heat transfer constraints constructed based on formulas (1) and (2) for different material pipe segments, the distance threshold between adjacent heating components installed on each type of pipe segment can be obtained.

[0071] According to embodiments of this disclosure, for a pipe made of a first material, a first distance threshold between adjacent heating components on the pipe made of the first material is obtained based on the pipe's heat transfer parameters and heat transfer constraints. The first material can be copper or aluminum, which have good thermal conductivity; therefore, the thermal conductivity of copper or aluminum can be substituted into formula K. 管 Other parameters are determined based on the actual heat transfer parameters of the pipeline, and will not be elaborated here. Based on the heat transfer constraint conditions of the pipeline constructed by formulas (1) and (2), the first distance threshold d between adjacent heating components on the pipeline section is obtained. 1max .

[0072] According to embodiments of this disclosure, for pipelines made of a second material, a second distance threshold between adjacent heating components on the pipeline made of the second material is obtained based on the pipeline heat transfer parameters and heat transfer constraints of the second material. The second material can be stainless steel, which has poor thermal conductivity; therefore, the thermal conductivity of stainless steel can be substituted into formula K. 管Other parameters are determined based on the actual heat transfer parameters of the pipeline, and will not be elaborated here. Based on the heat transfer constraint conditions of the pipeline constructed by formulas (1) and (2), the second distance threshold d between adjacent heating components on this pipe section is obtained. 2max .

[0073] According to embodiments of this disclosure, the installation positions of the heating components on different pipe sections made of different materials can be determined according to corresponding distance thresholds. For example, the first pipe section can be a copper pipe, and the second pipe section can be a steel pipe; since the thermal conductivity of copper is greater than that of steel, under the condition that other parameters are the same, the d of the copper pipe section... 1max Greater than d 2max At the connection between the copper pipe and the steel pipe, it can be d 2max This serves as a distance threshold between adjacent heating components at the connection point.

[0074] According to the embodiments of this disclosure, using the smallest interval between pipe segments of different pipe materials as the threshold at the connection point can reduce the impact of changes in pipe material on heat transfer, and timely replenish heat to the fluid inside the pipe, thereby achieving effective antifreeze protection for the fluid inside the pipe segment connection point.

[0075] In rail transit vehicles, to meet the ever-increasing service demands, the number and types of equipment are also increasing, and the piping between these devices is becoming more complex. Therefore, when installing heating components on the piping, it is necessary to consider the available installation space on the piping to determine the actual installation location of the heating components.

[0076] Figure 4 The flowchart illustrates a method for generating a target installation location for a heating assembly based on a distance threshold and pipeline space information of a target vehicle, according to an embodiment of the present disclosure.

[0077] like Figure 4 As shown, this embodiment 400 may include operations S410 to S440.

[0078] During operation S410, candidate installation locations for the heating components are obtained based on the pipeline space information of the target vehicle.

[0079] When operating S420, multiple candidate installation schemes are generated based on multiple candidate installation locations and pipeline lengths.

[0080] When operating the S430, the installation difficulty of multiple candidate installation schemes is evaluated, and an evaluation value is obtained.

[0081] In operation S440, based on the evaluation value, the target installation location corresponding to the target installation scheme is determined from multiple candidate installation schemes.

[0082] According to embodiments of this disclosure, obtaining candidate installation locations for heating components based on pipeline space information of the target vehicle may include the following operations: determining the size of an obstacle device on the pipeline where the heating component is to be installed based on the pipeline space information of the target vehicle; and obtaining multiple candidate installation locations based on the size of the obstacle device and a distance threshold.

[0083] According to embodiments of this disclosure, when the size of the obstacle device is less than or equal to a distance threshold, the heating components can be installed on either side of the obstacle device.

[0084] For example, if the distance threshold is 50cm and the obstacle device can be 30cm in size, then heating component A and heating component B can be installed on opposite sides of the obstacle device. If the candidate installation position of heating component A is 10cm from the left side of the obstacle device, the candidate installation positions of heating component B can be 3cm, 5cm, or 10cm from the right side of the obstacle device. As long as the distance between heating component A and heating component B is less than or equal to 50cm, it is acceptable; the candidate positions are not limited to those in the example above.

[0085] According to embodiments of this disclosure, when the size of the obstacle device is larger than a distance threshold, and the pipeline bypasses between the obstacle device and the vehicle wall, resulting in insufficient space on the pipeline for installing heating components, the first set of heating components can be installed on both sides of the obstacle device. The spacing between adjacent sets of heating components can be less than a percentage of the distance threshold to compensate for heat loss from the obstacle device. This percentage can be equal to the ratio of the distance threshold to the size of the obstacle device.

[0086] Figure 5 A schematic diagram illustrating the installation location of a heating assembly according to other embodiments of the present disclosure is shown.

[0087] like Figure 5 As shown, in embodiment 500, the distance threshold between adjacent heating components is 50cm, and the size of the obstacle device M501 can be 80cm. Because there is insufficient installation space on the pipes at the obstacle device, the interval between heating components c502 and d503 on the pipes on both sides of the obstacle device is at least 80cm. Therefore, the distance between heating component d503 and heating component e504, which are closer to the obstacle device in an adjacent group of heating components, can be less than 30cm (50x5 / 8).

[0088] According to embodiments of this disclosure, multiple candidate installation schemes are generated based on multiple candidate installation locations and pipeline lengths. For example, the spacing between adjacent heating components can be equal, achieving equidistant installation; or the spacing between adjacent heating components can be unequal, achieving non-equidistant installation. Examples include: the spacing between adjacent heating components gradually increasing, gradually decreasing, or exhibiting irregular changes.

[0089] According to embodiments of this disclosure, for multiple candidate installation schemes, the schemes can be evaluated based on installation difficulty. For example, different weights can be set, with higher weights assigned to locations with limited installation space and lower weights assigned to locations with ample installation space. This yields evaluation values ​​for multiple candidate installation schemes.

[0090] According to embodiments of this disclosure, the evaluation values ​​can be sorted, and the installation position of the heating component in the installation scheme with the lowest installation difficulty evaluation value can be determined as the target installation position.

[0091] According to embodiments of this disclosure, multiple candidate installation schemes are generated based on pipeline space and distance thresholds, which can flexibly adapt to various working conditions and improve the antifreeze effect under different working conditions.

[0092] Heat loss is greatest when the fluid in a pipeline is stagnant; therefore, the previous embodiments mainly described antifreeze measures under the extreme condition of no fluid flow in the pipeline. However, in actual operating conditions, the fluid will flow during vehicle operation. Based on the fluid flow, heat transfer will also occur between the fluids in the pipeline. Therefore, in this case, the pipeline contamination constraint conditions can be modified based on the fluid flow parameters in the pipeline to obtain more accurate results.

[0093] Figure 6 A flowchart illustrating a method for preventing freezing of vehicle piping according to other embodiments of the present disclosure is shown.

[0094] like Figure 6 As shown, this embodiment 600 may include operations S610 to S670.

[0095] In operation S610, pipeline heat transfer constraints are constructed based on the pipeline heat transfer parameters of the target vehicle and the operating environment parameters of the target vehicle.

[0096] In operation S620, the fluid flow parameters in the pipeline are determined from the operating environment parameters of the target vehicle.

[0097] In operation S630, the heat transfer constraint conditions of the pipeline are modified according to the fluid flow parameters in the pipeline, and the modified heat transfer constraint conditions of the pipeline are obtained.

[0098] In operation S640, based on the modified pipeline heat transfer constraints, the distance threshold between adjacent heating components on the pipeline pre-installed in the target vehicle is obtained.

[0099] In operation S650, based on the pipeline heat transfer constraint, the distance threshold between adjacent heating components on the pipeline pre-installed in the target vehicle is obtained.

[0100] When operating the S660, the target installation location of the heating component is generated based on the distance threshold and the pipeline space information of the target vehicle.

[0101] When operating the S670, install the heating components on the pipeline of the target vehicle according to the target installation location.

[0102] According to the embodiments of this disclosure, the above-described operations S610, S650 to S670 are the same as the corresponding operations S210, S220 to S230 in the previously described embodiment 200, and will not be repeated here.

[0103] According to an embodiment of this disclosure, the above operation S630 may include the following operations: obtaining the fluid flow heat transfer power in the pipeline based on the fluid flow parameters in the pipeline; and obtaining the modified pipeline heat transfer constraint conditions based on the fluid flow heat transfer power, the heat transfer power between the heating component and the fluid in the pipeline, and the heat transfer power between the fluid in the pipeline and the external environment.

[0104] For example, the fluid flow heat transfer power Q3 can be obtained according to formula (3):

[0105] Q3 = C 流 πr 2 V 流 ρ 流 (T 热 -T 中 (3)

[0106] Among them, C 流 Represents the specific heat of the fluid; r represents the inner diameter of the pipe; V 流 ρ represents the fluid velocity. 流 T represents fluid density; 热 Indicates the operating temperature threshold of the heating element; T 中 The temperature threshold representing the temperature equilibrium point.

[0107] According to embodiments of this disclosure, the modified pipeline heat transfer constraint condition can be such that the maximum spacing between adjacent heating components is achieved when the sum of the heat transfer power of the fluid flow and the heat transfer power between the heating components and the fluid in the pipeline is equal to the heat transfer power between the fluid in the pipeline and the external environment.

[0108] According to embodiments of this disclosure, pipeline heat transfer constraints are obtained based on fluid heat transfer correction. Since the heat transfer factor of fluid flow is added, the calculation result of the heat transfer equilibrium point is more accurate.

[0109] Figure 7 A schematic diagram of a vehicle antifreeze piping system according to an embodiment of the present disclosure is shown.

[0110] like Figure 7 As shown, in embodiment 700, multiple heating components 720 are spaced apart on the pipeline 710, and the position of each heating component on the pipeline is determined according to the antifreeze method for vehicle pipelines described above.

[0111] According to embodiments of this disclosure, the spacing between adjacent heating components in a plurality of heating components is equal.

[0112] It should be noted that the spacing between adjacent heating elements can be determined based on the available space within the piping in the actual application scenario. For example, when there is ample space in the piping, multiple heating elements can be arranged with equal spacing. When the piping space is limited, the spacing between the heating elements can be adjusted. For instance, if the spacing between heating element a and heating element b is large, the spacing between the heating elements on adjacent pipe sections can be reduced to promptly compensate for heat loss from the fluid.

[0113] According to embodiments of this disclosure, by using spaced heating components to replenish the heat loss of the fluid in the pipeline in a timely manner, the freezing of the fluid in the pipeline can be effectively prevented.

[0114] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0115] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A method for preventing freezing of vehicle piping, comprising: The fluid freezing temperature and pipe end temperature are obtained from the operating environment parameters of the target vehicle; the fluid freezing temperature is determined as the threshold of the temperature equilibrium point between adjacent heating components; the pipe end temperature is determined as the operating temperature threshold of the heating component; based on the temperature equilibrium point threshold, the operating temperature threshold, and the pipe heat transfer parameters of the target vehicle, pipe heat transfer constraints are constructed, wherein the pipe heat transfer constraints characterize the constraint relationship between the heat transfer power between the heating component and the fluid in the pipe and the heat transfer power between the fluid in the pipe and the external environment; when the heating component and the fluid in the pipe... When the heat transfer power is equal to the heat transfer power between the fluid in the pipeline and the external environment, it means that the heat replenished by the installed heating components is equal to the heat lost by the fluid, achieving minimum compensation for the fluid's heat loss; the target vehicle includes rail vehicles; the pipeline passes through the gaps between complex equipment in the target vehicle, and the available space between the pipeline wrapped with heat tracing material and the equipment is narrow; after the heating components are installed on the pipeline, the temperature at the midpoint of the distance between adjacent heating components is the lowest point of the fluid temperature in the pipeline, and the lowest temperature point at the midpoint of the distance between adjacent heating components is taken as the temperature equilibrium point; The fluid flow parameters within the pipeline are determined from the operating environment parameters of the target vehicle; Based on the fluid flow parameters in the pipeline, the heat transfer constraint conditions of the pipeline are modified to obtain the modified heat transfer constraint conditions of the pipeline. Based on the modified pipeline heat transfer constraint, a distance threshold between adjacent heating components pre-installed on the pipeline of the target vehicle is obtained; wherein, the distance threshold represents the maximum interval distance between the adjacent heating components. Based on the distance threshold and the pipeline space information of the target vehicle, the target installation location of the heating component is generated; and The heating assembly is installed on the pipeline of the target vehicle according to the target installation location.

2. The method according to claim 1, wherein, The operating environment parameters include the minimum ambient temperature; the pipeline heat transfer parameters include: the thermal conductivity of the pipeline material, the thermal conductivity of the fluid, the thermal conductivity of the insulation material, the pipeline dimensions, and the thickness of the insulation material; the pipeline heat transfer constraints are constructed based on the temperature equilibrium point threshold, the operating temperature threshold, and the pipeline heat transfer parameters of the target vehicle, including: The heat transfer power between the heating component and the fluid in the pipe is obtained based on the thermal conductivity of the pipe material, the thermal conductivity of the fluid, the pipe size, the operating temperature threshold, the temperature equilibrium point threshold, and the undetermined interval distance between adjacent heating components. Based on the thermal conductivity of the insulation material, the pipe dimensions, the lowest ambient temperature, and the thickness of the insulation material, the heat transfer power between the fluid inside the pipe and the external environment is obtained; and Based on the heat transfer power between the heating component and the fluid in the pipeline and the heat transfer power between the fluid in the pipeline and the external environment, the heat transfer constraint conditions of the pipeline are constructed.

3. The method according to claim 1, wherein, The method for obtaining the distance threshold between adjacent heating components pre-installed on the pipeline of the target vehicle based on the modified pipeline heat transfer constraint conditions includes: Given that the heat transfer power between the heating element and the fluid in the pipe is equal to the heat transfer power between the fluid in the pipe and the external environment, the maximum value of the undetermined interval distance between adjacent heating elements is obtained; and The maximum value of the undetermined interval distance is determined as the distance threshold.

4. The method according to claim 3, wherein the pipeline of the target vehicle may include multiple sections of pipeline made of different materials, and further includes: For a pipeline made of the first material, a first distance threshold between adjacent heating components on the pipeline made of the first material is obtained based on the heat transfer parameters of the pipeline made of the first material and the heat transfer constraint conditions of the pipeline. For pipelines made of the second material, a second distance threshold between adjacent heating components on pipelines made of the first material is obtained based on the heat transfer parameters of the pipelines made of the second material and the heat transfer constraints of the pipelines. as well as The minimum value between the first distance threshold and the second distance threshold is determined as the distance threshold between adjacent heating components at the connection point of the pipe made of the first material and the pipe made of the second material.

5. The method according to claim 1, wherein, The step of generating the target installation location of the heating component based on the distance threshold and the pipeline space information of the target vehicle includes: Based on the pipeline space information of the target vehicle, multiple candidate installation locations for the heating assembly are obtained; Based on the multiple candidate installation locations and the length of the pipeline, multiple candidate installation schemes are generated; The installation difficulty of the multiple candidate installation schemes is evaluated to obtain evaluation values; and Based on the evaluation value, the target installation location corresponding to the target installation scheme is determined from the plurality of candidate installation schemes.

6. The method according to claim 5, wherein, The step of obtaining the candidate installation location of the heating component based on the pipeline space information of the target vehicle includes: Based on the pipeline space information of the target vehicle, determine the dimensions of the obstacle device on the pipeline where the heating assembly is pre-installed; and The plurality of candidate installation locations are obtained based on the size of the obstacle device and the distance threshold.

7. The method according to claim 6, wherein, The step of modifying the heat transfer constraint conditions of the pipeline based on the fluid flow parameters within the pipeline to obtain the modified heat transfer constraint conditions includes: The heat transfer power of the fluid flow in the pipeline is obtained based on the fluid flow parameters within the pipeline; and The modified pipeline heat transfer constraint conditions are obtained based on the heat transfer power of the fluid flow, the heat transfer power between the heating component and the fluid in the pipeline, and the heat transfer power between the fluid in the pipeline and the external environment.

8. A vehicle antifreeze piping system, comprising: Pipeline; wherein a plurality of heating components are provided on the pipeline, and the installation positions of the plurality of heating components on the pipeline are obtained according to the method according to any one of claims 1-7.

9. The pipeline according to claim 8, wherein, The spacing between adjacent heating components in the plurality of heating components is equal.

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