CN114198589B - Bent pipe structure fatigue relieving system and structure fatigue relieving control method - Google Patents
Bent pipe structure fatigue relieving system and structure fatigue relieving control method Download PDFInfo
- Publication number
- CN114198589B CN114198589B CN202111308875.4A CN202111308875A CN114198589B CN 114198589 B CN114198589 B CN 114198589B CN 202111308875 A CN202111308875 A CN 202111308875A CN 114198589 B CN114198589 B CN 114198589B
- Authority
- CN
- China
- Prior art keywords
- pressure
- values
- impellers
- value
- bent pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a bent pipe structure fatigue relieving system and a structure fatigue relieving control method, and relates to the technical field of pipeline structure fatigue relieving, wherein the system comprises a modulating assembly, a plurality of impellers and a plurality of control units, wherein the plurality of impellers are arranged at intervals; the interval adjusting device is used for adjusting the interval between two adjacent impellers in the modulating assembly; the pressure sensor is positioned in the bent pipe and used for detecting a pressure value; and the controller is used for controlling the interval adjusting device to adjust the interval between two adjacent impellers according to the pressure value. According to the invention, the high-pressure liquid flowing in the bent pipe is modulated and buffered through the impellers arranged at intervals, the buffer degree is adjusted by adjusting the distance between the adjacent impellers, and the distance between the adjacent impellers is adjusted according to the pressure value, so that the modulating component can quickly achieve the state of buffering the liquid, and the inner wall of the bent pipe is prevented from generating strong alternating load.
Description
Technical Field
The invention relates to the technical field of fatigue relief of pipeline structures, in particular to a bent pipe structure fatigue relief system and a structure fatigue relief control method.
Background
In the pipeline of the ship power system, high-pressure fluid is usually present, and particularly when the ultrahigh-pressure fluid flows through the bent pipe under the ultrahigh-pressure working condition in the ship power system, when the pipeline structure with the bending is passed through the L-shaped or U-shaped pipeline and the like, severe turbulence is formed in and near the bent section of the pipeline, so that corresponding pressure fluctuation is generated on the inner wall of the pipeline. Under the repeated alternating load effect, the structural damage of the pipeline bending structure is gradually accumulated, if the structural damage cannot be effectively relieved, the fatigue damage is gradually aggravated, and finally fatigue cracks are caused on the pipeline wall, even the pipeline wall is broken, and the safe operation of a ship power system is seriously influenced.
Disclosure of Invention
The invention provides a bent pipe structure fatigue relieving system and a structure fatigue relieving control method, which are used for solving the defects that in the prior art, when high-pressure liquid flows through a bent pipe, severe turbulence is formed in and near a bent section of the pipeline, so that corresponding pressure fluctuation is generated on the inner wall of the pipeline, structural damage is gradually accumulated, the pipe wall is broken, and the safe operation of a ship power system is seriously influenced.
The invention provides a fatigue relieving system for a bent pipe structure, which comprises the following components:
the modulation assembly is suitable for being partially or completely positioned in a bending section of the bent pipe or completely positioned at the downstream side of the bent pipe, and comprises a sliding rod and a plurality of impellers arranged at intervals, and the impellers are arranged on the sliding rod;
the interval adjusting device is used for driving the impellers to move along the sliding rod and adjusting the interval between two adjacent impellers;
a pressure sensor, which is suitable for being arranged in the bent pipe and is positioned at the side of the modulating component perpendicular to the flowing direction of the liquid or at the downstream side of the modulating component, and is used for detecting the pressure value;
and the controller is used for controlling the interval adjusting device to adjust the interval between two adjacent impellers according to the pressure value.
According to the bent pipe structure fatigue relieving system provided by the invention, the bent pipe structure fatigue relieving system further comprises a fixing frame;
the modulation component is connected between the fixing frames and the inner wall of the bent pipe, or at least two fixing frames are fixed on the inner wall of the bent pipe, and the modulation component is connected between the two fixing frames.
According to the fatigue relieving system for the bent pipe structure, which is provided by the invention, the fatigue relieving system further comprises a limiting structure, wherein the limiting structure is used for limiting the impeller to rotate relative to the sliding rod.
According to the fatigue relieving system for the bent pipe structure, the interval adjusting device comprises a telescopic mechanism, and the telescopic mechanism is used for driving the impeller to move along the sliding rod.
According to the fatigue relieving system for the bent pipe structure, the interval adjusting device further comprises elastic pieces, and at least one elastic piece is arranged between every two adjacent impellers.
According to the bent pipe structure fatigue relieving system provided by the invention, the elastic piece comprises a spring, and the spring ring is sleeved on the sliding rod.
The invention also provides a fatigue relieving control method for the bent pipe structure, which comprises the following steps:
controlling the distance between adjacent impellers to be sequentially adjusted to N preset distance values, wherein N is larger than 1, keeping the distance value unchanged in a preset time period when the distance is adjusted to each preset distance value, and acquiring K pressure values detected by a pressure sensor in the preset time period, wherein K is larger than 1;
determining a target distance value from the N preset distance values according to the plurality of temperature values;
and controlling the distance between adjacent impellers to be adjusted to the target distance value.
According to the fatigue relief control method for the bent pipe structure provided by the invention, the determining of the target distance value according to the plurality of temperature values in the N preset distance values comprises the following steps:
and calculating the pressure variance values of the K detected pressure values corresponding to each preset distance value to obtain N pressure variance values corresponding to the N preset distance values, and determining a target distance value according to the N pressure variance values in the N preset distance values.
According to the fatigue relief control method for the bent pipe structure provided by the invention, the determining of the target distance value according to the N pressure variance values in the N preset distance values comprises the following steps:
and determining that a preset distance value corresponding to the minimum pressure variance value in the N preset distance values is the target distance value.
According to the fatigue relief control method for the bent pipe structure, provided by the invention, when M pressure sensors are arranged in the bent pipe, M is larger than 1, and the fatigue relief control method for the bent pipe structure comprises the following steps: keeping the distance value unchanged in the preset time period when the distance value is adjusted to each preset distance value, controlling each pressure sensor in the M pressure sensors to detect K pressure values in the preset time period, calculating the pressure variance value of the K pressure values detected by each pressure sensor, determining the sum of the M pressure variance values detected by the M pressure sensors as the sum of the pressure variance values, and determining the sum of N pressure variance values corresponding to the N preset distance values;
and determining that a preset distance value corresponding to the minimum pressure variance value sum in N preset distance values is the target distance value according to the minimum pressure variance value sum in the N pressure variance value sums.
According to the bent pipe structure fatigue relieving system and the structure fatigue relieving control method, the high-pressure liquid flowing in the bent pipe is buffered through the impellers arranged at intervals, the modulation buffering degree is adjusted through adjusting the distance between the adjacent impellers, the distance between the adjacent impellers is adjusted according to the obtained liquid pressure value after buffering of the modulation assembly, and the pressure sensor and the controller are cooperatively matched, so that the bent pipe structure fatigue relieving system can automatically adjust the distance between the adjacent impellers, and the modulation assembly can achieve the state of optimal modulation buffering of the liquid.
The invention provides a structural fatigue relieving system suitable for a ship bent pipeline based on a turbulent flow modulation principle, which comprises a main body, a main body and a main body, wherein the main body is provided with a main body, the: specifically, first, a certain number of spiral blades with adjustable intervals are designed on the inner wall of a ship bent pipeline, and when fluid passes through the spiral blades, large-scale vortex rotating around a central axis of the pipeline is formed, so that a strong modulation effect is generated on turbulence; secondly, deploying a high-precision pressure sensor on the bent pipeline, and monitoring pressure fluctuation of the inner wall of the pipeline in real time; then, under different pipeline operation conditions, the pitch of the helical blades is automatically adjusted, and the turbulence modulation effect is further adjusted, so that the pressure fluctuation monitored in real time is minimized; finally, the bending pipeline can keep smaller pressure fluctuation under different operation conditions, and the alternating load of the inner wall of the bending pipeline is weakened, so that the structural fatigue of the inner wall of the bending pipeline is effectively relieved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of one of the structural fatigue mitigation systems provided by the present invention;
FIG. 2 is a schematic diagram of a structural fatigue mitigation system according to a second embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the portion I of FIG. 1;
FIG. 4 is a schematic flow chart of the fatigue relieving control method for the bent pipe structure provided by the invention;
FIG. 5 is a second flow chart of the fatigue relieving control method for the bent pipe structure provided by the invention;
fig. 6 is a schematic structural diagram of an electronic device provided by the present invention.
Reference numerals:
100: a modulation component; 110: an impeller; 120: a slide bar;
200: a fixing frame;
300: a pitch adjustment device; 310: an elastic member; 320: a telescoping device;
400: a pressure sensor;
500: a controller;
610: a processor; 620: a communication interface; 630: a memory;
640: a communication bus;
710: a front end pipe; 720: a curved section; 730: and a rear end pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In describing embodiments of the present invention, it should be noted that the terms "first" and "second" and the like are used for clarity in describing the numbering of the product components and do not represent any substantial distinction unless explicitly stated or defined otherwise. "up", "down", "in" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
The front side in the embodiment means the front side in the direction of flowing the liquid in the bent pipe, and the rear side in the direction of flowing the liquid out.
The description of the present invention "within …" includes both ends. Such as "in the range of 10 to 20," inclusive of the endpoints 10 and 20 at both ends of the range.
It should be noted that the term "coupled" is to be interpreted broadly, as being able to be coupled directly or indirectly via an intermediary, unless explicitly stated or defined otherwise. The specific meaning of the terms in the embodiments of the invention will be understood by those of ordinary skill in the art in a specific context.
The bent pipe structure fatigue relieving system and the structure fatigue relieving control method of the present invention are described below with reference to fig. 1 to 6.
Specifically, referring to fig. 1, the present embodiment provides a fatigue relief system for a bent pipe structure, including: the device comprises a modulation assembly 100, a fixing frame 200, a distance adjusting device 300, a pressure sensor 400 and a controller 500.
Specifically, the modulating assembly 100 includes a plurality of impellers 110 arranged at intervals, where the impellers 110 buffer the flowing liquid, and the impellers 110 have various embodiments, such as a rotating impeller, a three-blade impeller, or a four-blade impeller, and can modulate and buffer the flowing liquid passing through the impellers 110, prevent the high-pressure liquid from forming a strong alternating load in and near the curved section 720 of the flowing pipeline, and reduce structural fatigue caused by the high-pressure alternating of the liquid on the inner wall of the pipeline. Specifically, the present invention is capable of modulating and buffering the high-pressure liquid flowing through the impeller to reduce the alternating load of the liquid in the pipeline, and both the shape and the size fall within the protection scope of the impeller 110. Preferably, the present embodiment employs a helical impeller.
Specifically, the number of impellers 110 is plural, and the number of the impellers is two or more, and 6 impellers 110 are taken as an example in this embodiment.
Preferably, the plurality of impellers 110 connected in series may have one or more columns. When a plurality of impellers 110 connected in series are in a row, preferably, the center line of the impellers 110 coincides with the center line of the bent pipe; when the plurality of impellers 110 connected in series are arranged in a plurality of rows, the plurality of rows of impellers 110 are preferably arranged in a central symmetry along the center line of the bent pipe.
Preferably, when there is a row of a plurality of impellers 110 connected in series, the ratio of the outer diameter of the impellers 110 to the inner diameter of the elbow is greater than 1/2 and less than 1.
Specifically, the bent pipe in this embodiment refers to a pipe body, such as a C-shaped pipe or an L-shaped pipe, in which the flow direction of the liquid in the pipe is changed due to bending of the pipe. Specifically, the bending angle of the L pipe shown in FIG. 1 is 90 degrees. It should be noted that the elbow not only contains one inflow tube, but also may have multiple inflow organs that merge into the manifold at the same bending section 720. Specifically, the bent section 720 in this embodiment refers to a section of the pipeline corresponding to a region in which the flow direction of the liquid is changed by bending the pipeline when the liquid in the pipeline flows; it should be noted that the liquid does not bend in the flow direction described in the present embodiment when the flow direction is changed, for example, in a straight line pipe due to its own flow inertia. As shown in fig. 1, the overall flow direction of the liquid flowing upward in the vertical front-end pipe 710 is vertically upward, and the flow direction of the liquid after flowing into the bent section 720 is bent due to the bending of the pipe at the bent section 720, and finally flows into the rear-end pipe 730, and the flow direction is changed to the right.
Preferably, the region where the curvature of the outer wall of the elbow in the direction of fluid flow is changed is defined as curved section 720. As shown in fig. 1, the outer walls of the front end pipe 710 and the rear end pipe 720 are in a straight state along the fluid flow direction, and the curvature is always zero. The curvature of the outer wall of the curved section 720 in the direction of fluid flow is constantly changing.
The modulating assembly 100 in this embodiment is partially or fully located in the bent section 720 of the pipeline, so as to buffer the liquid in the bent pipe in time when the flow direction of the liquid changes, so that the inner wall of the bent pipe is prevented from forming a strong alternating load due to the change of the flow direction of the high-pressure liquid, and the structural fatigue of the inner wall of the bent pipe is effectively relieved.
Or, when the bending section 720 is difficult to form the bending-shaped modulation assembly 100, the impellers 110 of the modulation assembly 100 are arranged at intervals along a straight line and all are positioned at the downstream side of the bending pipe, that is, the modulation assembly 100 is all positioned in the rear end pipe 730 and the minimum distance between the modulation assembly and the bending section 720 is smaller than a first preset value, so that modulation buffering is performed when liquid flows through the bending section 720 and enters the rear end pipe 730, and strong alternating load is prevented from being generated at the inflow port of the rear end pipe 730. Specifically, the specific value of the first preset value, such as 5 cm, 10 cm or 30 cm, is set according to the actual condition of the pipe, and the closer the modulating assembly 100 is to the bending section 720, the better the modulating buffering effect is.
Specifically, the modulation assembly 100 is further provided with a sliding rod 120, the sliding rod 120 is fixedly connected with the inner wall of the elbow, the impeller 110 is mounted on the sliding rod 120 and is suitable for sliding along the axis of the sliding rod 120, and the sliding rod 120 sequentially passes through the central hole of the impeller 110, so that the impeller 110 is ensured to buffer flowing liquid. The slide bar 120 is provided to prevent the impeller 110 from being displaced in the radial direction of the pipe under the impact of flowing liquid. The distance between the impellers 110 along the axial direction of the slide bar 120 is adjustable, and the modulation buffer degree of the modulation assembly 100 on the flowing liquid is adjusted by adjusting the distance between the impellers 110.
Specifically, when the number of the impellers 110 exceeds 3, at least one group of adjacent impellers 110 is provided, and one or more groups of the intervals among the groups of adjacent impellers 110 can be adjusted, and the intervals among all groups of adjacent impellers 110 can also be adjusted, which is specifically exemplified by actual requirements.
Specifically, the fixing frame 200 is used for fixing the modulating assembly 100 on the inner wall of the elbow, so that the modulating assembly 100 is always partially or completely located in the bent section 720 of the pipeline, and the modulating assembly 100 is prevented from being offset by a larger distance due to the flow of the liquid.
Specifically, the spacing adjustment device 300 is used for adjusting the spacing between two adjacent impellers 110 in the modulation assembly 100; in particular, the distance adjusting device 300 has various embodiments, and any adjusting device capable of adjusting the distance between two adjacent impellers 110 in the modulating assembly 100 falls within the protection scope of the present invention defined by the distance adjusting device 300.
The pressure sensor 400 is located in the elbow pipe and is located at a side of the modulating assembly 100 perpendicular to the flowing direction of the liquid, or is located at a downstream side of the modulating assembly 100, that is, is located behind the modulating assembly 100 and has a minimum distance from the modulating assembly 100 smaller than a second preset value, and is used for obtaining a pressure value in the elbow pipe; specifically, the pressure sensor 400 is mounted radially laterally or rearwardly of the brewing assembly 100, which refers to the rear side of the brewing assembly 100 in the direction of liquid flow. When the pressure sensor 400 is located at the rear of the modulating assembly 100, the minimum distance between the pressure sensor 400 and the modulating assembly 100 is smaller than the second preset value, and a specific value of the second preset value, such as 5 cm, 10 cm or 30 cm, is set according to the actual condition of the pipeline, so as to perform pressure detection on the pipeline of the liquid area buffered by the modulating assembly 100, and the pressure detection effect is better when the pressure sensor 400 is closer to the modulating assembly 100.
In this embodiment, the pressure sensor 400 is installed at the side or the rear of the modulating assembly 100, and detects the pressure conditions of the liquid and the pipeline buffered by the modulating assembly 100, so as to obtain the pressure values of the liquid and the pipeline buffered by the modulating assembly 100.
Preferably, the pressure sensor 400 may be provided in plural numbers for detecting pressure values in plural areas within the elbow. Preferably, the plurality of pressure sensors 400 are annularly around the outside of the modulation assembly 100, and the plurality of pressure sensors 400 are equidistantly disposed.
And a controller 500 for controlling the interval adjustment device 300 to adjust the interval between the adjacent two impellers 110 according to the pressure value.
The system is alleviated to return bend structure fatigue, through a plurality of impellers 110 that the interval set up to the high pressure liquid that flows through in the return bend is buffered, and adjust the modulation buffering degree through adjusting the interval of adjacent impeller 110, through the liquid pressure value after obtaining the modulation subassembly 100 buffering, adjust the interval between the adjacent impeller 110 according to the pressure value, and cooperate with the controller through pressure sensor 400, so that the system is alleviated to return bend structure fatigue can the automatic adjustment interval of adjacent impeller 110, make modulation subassembly 100 reach the state that carries out the best modulation buffering to liquid fast.
The invention provides a structural fatigue relieving system suitable for a ship bent pipeline based on a turbulent flow modulation principle, which comprises a main body, a main body and a main body, wherein the main body is provided with a main body, the: specifically, first, a certain number of spiral blades with adjustable intervals are designed on the inner wall of a ship curved pipeline, when fluid passes through the spiral blades, large-scale vortex rotating around a central axis of the pipeline is formed, a strong modulation effect is generated on turbulence, and turbulence energy is concentrated to the large-scale vortex, so that turbulence near the inner wall of the curved pipeline and corresponding pressure fluctuation are weakened, and structural fatigue is relieved; secondly, deploying a high-precision pressure sensor on the bent pipeline, and monitoring pressure fluctuation of the inner wall of the pipeline in real time; then, under different pipeline operation conditions, the distance between the spiral blades is automatically adjusted, the flow speed of the large-scale vortex is changed, and the turbulence modulation effect is further adjusted, so that the pressure fluctuation monitored in real time is minimized; finally, the bending pipeline can keep smaller pressure fluctuation under different operation conditions, and the alternating load of the inner wall of the bending pipeline is weakened, so that the structural fatigue of the inner wall of the bending pipeline is effectively relieved.
Specifically, as shown in fig. 2, the modulation assembly 100 is connected between the fixing frame 200 and the inner wall of the elbow, one end of the modulation assembly 100 is fixed on the inner wall of the elbow, and the other end of the modulation assembly 100 is fixedly connected with the inner wall of the elbow at another position through the fixing frame 200.
Alternatively, as shown in connection with fig. 1, there are at least two holders 200, and both holders 200 are fixed on the inner wall of the elbow, and the modulation assembly 100 is connected between the two holders 200. The modulating assembly 100 is fixed on the inner wall of the bent pipe through two fixing frames 200, and the mounting position of the modulating assembly 100 in the bent pipe can be selected according to actual conditions.
Specifically, the present embodiment provides a specific implementation manner of the distance adjusting device 300, and referring to fig. 3, the distance adjusting device 300 includes an elastic member 310 and a telescopic device 320, wherein the elastic member 310 is connected between two adjacent impellers 110, and at least one elastic member 310 is disposed between each two adjacent impellers 110.
The telescopic device 320 is connected between the modulating assembly 100 and the fixing frame 200, or the telescopic device 320 is connected between two adjacent impellers 110, or the telescopic device 320 is connected between the sliding rod 120 and the modulating assembly 100, and the telescopic device 320 is used for controlling the elastic piece 310 to stretch to different lengths.
Specifically, the elastic member 310 may be a spring or a shrapnel, in this embodiment, the impellers 110 are connected in a telescopic manner through the elastic member 310, and due to the arrangement of the spring or the shrapnel, the impellers 110 cannot rotate independently. Preferably, the spring is always in a stretched state during operation, so that the modulation assembly 100 does not drop greatly, and does not deviate and shake to a greater extent along with the flow of the liquid.
The telescopic device 320 is connected between the modulating assembly 100 and the fixing frame 200, or between two adjacent impellers 110, the telescopic device 320 can stretch and retract, the length value of the telescopic device is adjusted, the modulating assembly 100 is stretched, the elastic piece 310 stretches to different lengths in the stretching process, and the distance between the telescopic device 320 and the adjacent impellers 110 is adjustable.
Specifically, the telescopic device 320 according to the present embodiment includes at least one of a stepper motor, a cylinder, and an oil cylinder. Preferably, a stepper motor is used, and the adjacent impellers 110 in the modulation assembly 100 are driven by the telescopic stepper motor to adjust to different spacing values.
Preferably, in the modulation assembly 100 of the present embodiment, the modulation assembly 100 is connected to the fixing frame 200 through an elastic member 310, and the modulation assembly 100 is also connected to the inner wall of the elbow through the elastic member 310.
Preferably, the modulating assembly 100 further comprises a sliding bolt, the sliding bolt passes through the central hole of the impeller 110 and is fixedly connected with the impeller 110, and adjacent sliding bolts are connected through an elastic member 310, so as to realize telescopic connection between adjacent impellers 110.
Specifically, the slide bolt is slidably mounted on the slide bar 120. Preferably, the sliding bolt is provided with a through hole along the central axis thereof, the sliding rod 120 passes through the through hole to realize sliding connection between the sliding bolt and the sliding rod 120, and when the elastic piece 310 is a spring, the spring is sleeved on the sliding rod 120.
Preferably, the relief system according to the present embodiment further includes a limiting structure, where the limiting structure is configured to limit the impeller 110 from rotating circumferentially relative to the sliding rod 120, such as the elastic member 310 of the spacing adjustment device 300, and when the tension of the elastic member 310 reaches a certain level, the elastic member 310 acts as the limiting structure to limit the rotation of the impeller. Alternatively, the sliding rod 120 in this embodiment may be a circular rod, and the corresponding sliding bolt center hole is a circle matching the circular rod. Either elliptical or non-circular, such as polygonal, e.g. triangular or quadrilateral, etc. The elliptic and polygonal slide bars 120 and the impellers 110 are relatively fixed along the axial circumferential direction of the slide bars 120, namely the impellers 110 cannot rotate along the slide bars 120, so that the impellers 110 are prevented from rotating under the impact of flowing liquid to influence the buffering effect of the flowing liquid. Or the number of the slide bars 120 is two, so that the impeller 110 is prevented from rotating. The sliding rod 120 has a limiting function and is used as a limiting structure to limit the rotation of the impeller 110.
Specifically, on the basis of the fatigue relieving system of the elbow structure, the embodiment further provides a fatigue relieving control method of the elbow structure, which is shown in fig. 4 in combination, and includes the following steps:
in step S100, the distance between adjacent impellers 110 is controlled to be respectively adjusted to N preset distance values, N is greater than 1, the distance value is kept unchanged for a preset time period when each preset distance value is adjusted, and the pressure sensor 400 is controlled to detect K pressure values for the preset time period, wherein K is greater than 1.
Specifically, N preset distance values are stored in the controller, for example, the stepper motor is provided with N gears, and when the stepper motor runs to different gears, the distance between the adjacent impellers 110 is adjusted to different distance values.
It should be noted that, when the distance between any two adjacent impellers 110 in the plurality of impellers 110 is adjusted, there is a deviation in the adjustment of the distance between the different impellers 110, and the distance between the adjacent impellers 110 is the average value of the distances between all the adjacent two impellers 110 in all the impellers 110.
Specifically, when the adjacent impellers 110 are adjusted to a certain preset distance value, the distance between the adjacent impellers 110 is controlled to be constant and maintained for a preset period of time, and the pressure value is measured once every a certain period of time within the preset period of time, for example, K pressure values are detected.
For one pressure sensor 400, n×k pressure values are detected in total when the pitches of adjacent impellers 110 are respectively adjusted to N preset distance values;
Specifically, among the detected n×k pressure values, a target distance value to which the appropriate pressure is matched, which is one of N preset distance values, may be determined based on the degree of variation or the maximum value of the pressure values.
Step S300, controlling the distance between adjacent impellers 110 to be adjusted to the target distance value.
Specifically, after the target distance value is determined, the distance between the adjacent impellers 110 is controlled to be adjusted to the target distance value, and at this time, the buffer effect of the modulating component 100 on the flowing liquid meets the requirement that the pressure is in a proper range, so that the alternating load of the inner wall of the curved pipeline is weakened, and the structural fatigue of the inner wall of the curved pipeline is effectively relieved.
According to the invention, the distance between the impellers 110 is controlled by the sensor, the pressure value is obtained in real time by the pressure sensor, and the target distance value is determined according to the pressure value, so that the self-adjustment process of the bent pipe fatigue relieving system is realized.
Further, determining the target distance value according to the plurality of pressure values among the N preset distance values according to the embodiment includes:
and calculating the pressure variance values of the K detected pressure values corresponding to each preset distance value, determining N pressure variance values corresponding to the N preset distance values, and determining a target distance value in the N preset distance values according to the N pressure variance values.
For example, the sensor detects K pressure values, T (1) and T (2) … T (K), respectively, within a preset period, and calculates a pressure variance value S of the K pressure values, where the calculation formula is:
wherein, the liquid crystal display device comprises a liquid crystal display device,
for the N preset distance values, N pressure variance values S (1), S (2) … S (N) are calculated in total, and the target distance value of the N preset distance values is determined from the N pressure variance values.
Specifically, determining a target distance value of the N preset distance values according to the N pressure variance values includes: when the distance between the adjacent impellers 110 is controlled to be adjusted to a preset distance value, a corresponding pressure variance value under the preset distance value is calculated, and when the pressure variance value is smaller than the preset variance value, the adjusted preset distance value is the target distance value.
In the process of adjusting the distance between adjacent impellers 110, the embodiment detects and calculates the pressure variance value in real time, and when the pressure variance value is smaller than the preset variance value, namely, the pressure fluctuation range generated when the high-pressure liquid in the bent pipe flows is in a proper range, the pressure fluctuation can not generate larger alternating load on the inner wall of the bent pipe at the moment, the fatigue influence of the structure of the inner wall of the bent pipe is smaller, and the operation safety of the bent pipe is ensured.
Optionally, determining the target distance value of the N preset distance values according to the N pressure variance values further includes:
and determining that a preset distance value corresponding to the minimum pressure variance value in the N preset distance values is the target distance value.
After the distance between the adjacent impellers 110 is controlled to be adjusted to each preset distance value, N pressure variance values S (1), S (2) … S (N) are obtained, and a minimum pressure variance value is determined from the N pressure variance values, where a distance value corresponding to the minimum pressure variance value among the N preset distance values is a target distance value.
In this embodiment, the distance between adjacent impellers 110 is controlled to be adjusted to all preset distance values, the pressure variance value corresponding to each preset distance value is detected and calculated, and the preset distance value corresponding to the minimum pressure variance value is determined to be the target distance value, that is, the minimum pressure fluctuation is generated when the high-pressure liquid in the elbow flows, so that the alternating load of the inner wall of the bent pipeline is weakened, the structural fatigue of the inner wall of the bent pipeline is effectively relieved, and the operation safety of the bent pipeline is ensured.
Preferably, in the method for controlling fatigue relief of the bent pipe structure according to the present embodiment, during adjustment of the distance between adjacent impellers 110, a pressure variance value is detected and calculated in real time, the relationship between the pressure variance value and a preset variance value is determined, and when the pressure variance value is smaller than the preset variance value, adjustment of the distance between adjacent impellers 110 is stopped, and the current distance value is determined as the target distance value; when the pressure variance values corresponding to all the preset distance values are greater than or equal to the preset variance values, the step S200 and the step S300 are executed, and the target distance value is determined according to the minimum variance value in all the preset variance values, so that when the alternating load in the bent pipe is large, the alternating load in the bent pipe is controlled to be minimum, the alternating load on the inner wall of the bent pipe is weakened to the greatest extent, and the operation safety of the bent pipe is ensured.
Preferably, when a plurality of pressure sensors 400 are disposed in the elbow, if M pressure sensors 400 are disposed in the elbow, M is greater than 1, and referring to fig. 5, the fatigue relief control method for the elbow structure includes the following steps:
step S110, controlling the distance between adjacent impellers 110 to be respectively adjusted to N preset distance values, keeping the distance value unchanged in the preset time period when adjusting to each preset distance value, and controlling each pressure sensor 400 in the M pressure sensors 400 to detect K pressure values in the preset time period;
specifically, N preset distance values are stored in the controller, for example, the stepper motor is provided with N gears, and when the stepper motor runs to different gears, the distance between the adjacent impellers 110 is adjusted to different distance values.
It should be noted that, when the distance between any two adjacent impellers 110 in the plurality of impellers 110 is adjusted, there is a deviation in the adjustment of the distance between the different impellers 110, and the distance between the adjacent impellers 110 is the average value of the distances between all the adjacent two impellers 110 in all the impellers 110.
Specifically, each pressure sensor 400 detects K pressure values for a preset period of time, and for M pressure sensors 400, m×k pressure values are detected in total; for N preset distance values, detecting M multiplied by K multiplied by N pressure values altogether;
step S210, calculating pressure variance values of K pressure values detected by each pressure sensor 400, determining that the sum of M pressure variance values detected by M pressure sensors 400 is a pressure variance value sum, determining N pressure variance value sums corresponding to N preset distance values, and determining that a preset distance value corresponding to the minimum pressure variance value sum in the N preset distance values is the target distance value according to the minimum pressure variance value sum in the N pressure variance value sums;
specifically, for a single pressure sensor 400, it detects K pressure values within a preset time period, calculates the pressure variance values of the K pressure values, and calculates the pressure variance values of all the pressure sensor detection pressure values, respectively.
For example, M pressure sensors detect K pressure values, T respectively, within a preset time period 1 (1)、T 1 (2)…T 1 (K) And T M (1)、T M (2)…T M (K) And the pressure variance value S (M) of the M groups of pressure values is calculated by the following formula:
…
wherein, the liquid crystal display device comprises a liquid crystal display device,
…
for the current preset distance value, calculating the sum of M pressure variance values as the sum of pressure variance values S (Z), wherein the calculation formula is as follows:
S(Z)＝S(1)+S(2)+…+S(M)。
specifically, for N preset distance values, N pressure variance value sums S (Z) are calculated as S 1 (Z)、S 2 (Z)…S N (Z). And determining a preset distance value corresponding to the minimum pressure variance value sum in the N pressure variance value sums S (Z), wherein the preset distance value is a target distance value.
Step S300, controlling the distance between adjacent impellers 110 to be adjusted to the target distance value.
Specifically, after the target distance value is determined, the distance between the adjacent impellers 110 is controlled to be adjusted to the target distance value, and at this time, the buffer effect of the modulating component 100 on the flowing liquid meets the requirement that the pressure is in a proper range, so that the alternating load of the inner wall of the curved pipeline is weakened, and the structural fatigue of the inner wall of the curved pipeline is effectively relieved.
The controller provided by the invention is described below, and the controller described below and the bend structure fatigue relief control method described above can be referred to correspondingly.
Fig. 6 illustrates a physical schematic diagram of an electronic device, as shown in fig. 6, which may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to execute the bent-tube structure fatigue mitigation control method.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the method of bend-structure fatigue relief control provided by the methods described above.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program that when executed by a processor is implemented to perform the above-provided bend structure fatigue relief control methods.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A bent-tube structural fatigue mitigation system, comprising:
the modulation assembly is suitable for being partially or completely positioned in a bending section of the bent pipe or completely positioned at the downstream side of the bent pipe, and comprises a sliding rod and a plurality of impellers arranged at intervals, and the impellers are arranged on the sliding rod;
the interval adjusting device is used for driving the impellers to move along the sliding rod and adjusting the interval between two adjacent impellers;
a pressure sensor, which is suitable for being arranged in the bent pipe and is positioned at the side of the modulating component perpendicular to the flowing direction of the liquid or at the downstream side of the modulating component, and is used for detecting the pressure value;
the controller is used for controlling the interval adjusting device to adjust the interval between two adjacent impellers according to the pressure value;
the limiting structure is used for limiting the impeller to rotate relative to the sliding rod;
the outer diameter of the impeller is smaller than the inner diameter of the bent pipe.
2. The elbow structure fatigue mitigation system of claim 1, further comprising a mount;
the modulation component is connected between the fixing frames and the inner wall of the bent pipe, or at least two fixing frames are fixed on the inner wall of the bent pipe, and the modulation component is connected between the two fixing frames.
3. The elbow structure fatigue mitigation system according to claim 1 or 2, wherein the pitch adjustment device comprises a telescoping mechanism for driving the impeller to move along the slide bar.
4. The elbow structural fatigue mitigation system of claim 3, wherein the spacing adjustment device further comprises an elastic member, at least one elastic member being disposed between each adjacent two of the impellers.
5. The elbow structure fatigue mitigation system of claim 4, wherein the elastic member comprises a spring that is looped around the slide bar.
6. A bent-tube structure fatigue-relieving control method of the bent-tube structure fatigue-relieving system according to any one of claims 1 to 5, comprising the steps of:
controlling the distance between adjacent impellers to be sequentially adjusted to N preset distance values, wherein N is larger than 1, keeping the distance value unchanged in a preset time period when the distance is adjusted to each preset distance value, and acquiring K pressure values detected by a pressure sensor in the preset time period, wherein K is larger than 1;
determining a target distance value from the N preset distance values according to the pressure values;
and controlling the distance between adjacent impellers to be adjusted to the target distance value.
7. The method of claim 6, wherein determining a target distance value from a plurality of pressure values among the N preset distance values comprises:
and calculating the pressure variance values of the K detected pressure values corresponding to each preset distance value to obtain N pressure variance values corresponding to the N preset distance values, and determining a target distance value according to the N pressure variance values in the N preset distance values.
8. The method of claim 7, wherein determining a target distance value from N preset distance values according to N pressure variance values comprises:
and determining that a preset distance value corresponding to the minimum pressure variance value in the N preset distance values is the target distance value.
9. The bend structural fatigue relief control method according to claim 6, wherein when M pressure sensors are provided in the bend, M is greater than 1, the bend structural fatigue relief control method comprising:
keeping the distance value unchanged in the preset time period when the distance value is adjusted to each preset distance value, controlling each pressure sensor in the M pressure sensors to detect K pressure values in the preset time period, calculating the pressure variance value of the K pressure values detected by each pressure sensor, determining the sum of the M pressure variance values detected by the M pressure sensors as the sum of the pressure variance values, and determining the sum of N pressure variance values corresponding to the N preset distance values;
and determining that a preset distance value corresponding to the minimum pressure variance value sum in N preset distance values is the target distance value according to the minimum pressure variance value sum in the N pressure variance value sums.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308875.4A CN114198589B (en) | 2021-11-05 | 2021-11-05 | Bent pipe structure fatigue relieving system and structure fatigue relieving control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308875.4A CN114198589B (en) | 2021-11-05 | 2021-11-05 | Bent pipe structure fatigue relieving system and structure fatigue relieving control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114198589A CN114198589A (en) | 2022-03-18 |
| CN114198589B true CN114198589B (en) | 2023-06-23 |
Family
ID=80646985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111308875.4A Active CN114198589B (en) | 2021-11-05 | 2021-11-05 | Bent pipe structure fatigue relieving system and structure fatigue relieving control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114198589B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB730009A (en) * | 1952-01-02 | 1955-05-18 | Fairey Aviat Co Ltd | Improvements relating to ducts for fluid flow |
| US5529084A (en) * | 1994-03-24 | 1996-06-25 | Koch Engineering Company, Inc. | Laminar flow elbow system and method |
| CN1612989A (en) * | 2002-01-03 | 2005-05-04 | 百思科技公司 | Fluid flow controller |
| CN101963172A (en) * | 2010-10-26 | 2011-02-02 | 西安建筑科技大学 | n-type 180-degree rectification bent pipe |
| CN107091390A (en) * | 2016-02-18 | 2017-08-25 | 北京福田康明斯发动机有限公司 | Bend pipe structure, pipeline and straight tube structure |
| CN110857752A (en) * | 2018-08-22 | 2020-03-03 | 尼的曼控股公司 | Ventilation system, method of operating a ventilation system, duct section to be used in a ventilation system, and use of such a duct section |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11085470B2 (en) * | 2019-05-31 | 2021-08-10 | Kalsi Engineering, Inc. | Flow conditioning assembly |
-
2021
- 2021-11-05 CN CN202111308875.4A patent/CN114198589B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB730009A (en) * | 1952-01-02 | 1955-05-18 | Fairey Aviat Co Ltd | Improvements relating to ducts for fluid flow |
| US5529084A (en) * | 1994-03-24 | 1996-06-25 | Koch Engineering Company, Inc. | Laminar flow elbow system and method |
| CN1612989A (en) * | 2002-01-03 | 2005-05-04 | 百思科技公司 | Fluid flow controller |
| CN101963172A (en) * | 2010-10-26 | 2011-02-02 | 西安建筑科技大学 | n-type 180-degree rectification bent pipe |
| CN107091390A (en) * | 2016-02-18 | 2017-08-25 | 北京福田康明斯发动机有限公司 | Bend pipe structure, pipeline and straight tube structure |
| CN110857752A (en) * | 2018-08-22 | 2020-03-03 | 尼的曼控股公司 | Ventilation system, method of operating a ventilation system, duct section to be used in a ventilation system, and use of such a duct section |
Non-Patent Citations (1)
| Title |
|---|
| T型管湍流穿透现象的热流固耦合疲劳分析;李庚旺;张骐;陈爽;欧阳斌;卢涛;;北京化工大学学报(自然科学版)(第04期);第84-91页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114198589A (en) | 2022-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Araya et al. | Transition to bluff-body dynamics in the wake of vertical-axis wind turbines | |
| CN114198589B (en) | Bent pipe structure fatigue relieving system and structure fatigue relieving control method | |
| CN114183620B (en) | Vibration and noise reduction system for bent pipe and vibration and noise reduction control method | |
| US9404368B2 (en) | Blade cascade and turbomachine | |
| Keil et al. | Enhancement of heat transfer by flow pulsation | |
| EP2653722B1 (en) | Yaw error sensor, wind turbine and yaw angle adjustment | |
| RU2721466C1 (en) | Method of controlling wind-driven power plant and corresponding wind-driven power plant | |
| CN114198583B (en) | Junction pipe thermal fatigue relieving system and thermal fatigue relieving control method | |
| CN106762709A (en) | A kind of micro- lift vertical axial-flow pump lift measurement apparatus and measuring method | |
| CN113202819A (en) | Guide device for shaft extension tubular pump based on adjustable blade number and control method | |
| AU2019372375B2 (en) | Video monitoring method and system for blade of wind turbine | |
| CA2846566A1 (en) | A sensor arrangement for a tidal generator | |
| CN107013784A (en) | Condense water hammer restraining device and suppression system | |
| CN109895985B (en) | Vibration control method and system for ship central cooler outboard seawater excitation heat exchange tube | |
| EP2896819A1 (en) | Water turbine generator | |
| PT2232058E (en) | Air turbine for a wave power station | |
| Fujisawa et al. | Flow visualization and PIV measurement of flow field around a Darrieus rotor in dynamic stall | |
| KR101261102B1 (en) | Method of setting performance characteristic of pump and method of manufacturing diffuser vane | |
| Elhelaly et al. | Effect of pitch ratio and flat bar support conditions on fei threshold for low mdp parallel triangular array–single-phase water-flow | |
| Massouh et al. | Investigation of wind turbine flow and wake | |
| Forbush et al. | Characterization and control of cross-flow turbine in shear flow | |
| EP2796707A1 (en) | Hydroelectric plant with an Archimedean screw rotor | |
| CN111680372A (en) | One-dimensional calculation method considering working capacity of centrifugal fan impeller in natural prerotation | |
| CA2537466A1 (en) | Horizontally constructed continuous steam generator and method for the operation thereof | |
| CN116892983B (en) | Water flow direction and flow velocity measuring device and measuring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |