Electrical equipment cooling line damping method

Abstract

The application discloses a kind of electrical equipment cooling pipeline vibration reduction methods, comprising: according to the fluid dynamics theory, determine the fluid flow state of each original cooling pipeline of flow passage;Determine the size range of new cooling pipeline;Combining flow passage operating rated flow, determine the limit flow velocity range of fluid at each key position in each new cooling pipeline;The Reynolds number of fluid corresponding limit flow velocity range at each key position is calculated;According to the order of multiple Reynolds numbers corresponding limit flow velocity range from big to small, the vibration value of test pipe is determined, compared with the technical requirement value of electrical equipment, the vibration value corresponding to the pipe size set smaller than the technical requirement value is set as the preset size set;The minimum preset size of the difference between the size of the pipe at its adjacent key position in the preset size set of the pipe at each key position is taken as the actual size of the pipe at the key position;Determine the pipe type according to actual size;Vibration reduction and noise reduction, without changing structural strength and electrical parameters, low cost, widely used.

Description

Technical Field

[0001] This invention relates to the field of pipeline vibration reduction technology, and specifically to a method for vibration reduction of cooling pipelines for electrical equipment. Background Technology

[0002] Pipeline vibration is one of the most frequent problems encountered in engineering equipment. Pipeline vibration can be caused by a variety of factors, including fluid flow, mechanical vibration, and external impacts. Turbulent flow, occurring when the Reynolds number exceeds a critical value, can induce periodic pressure pulsations. Sudden cessation or change of direction in the fluid can generate pressure waves, leading to water hammer and vibration in the pipeline. For example, the pressure wave propagation speed of a rapidly closing valve can reach 1400 m / s, and the cavitation effect caused by the collapse of air bubbles (the instantaneous pressure peak generated by bubble collapse can reach 1 GPa, with an duration on the microsecond scale) can also cause vibration. Mechanical vibrations include those generated during the operation of pumps and compressors, as well as pipeline vibrations caused by external factors such as earthquakes and wind. Furthermore, there is the resonance effect caused when the natural frequency of the pipeline and the external frequency excitation reach a certain consistency.

[0003] Common pipeline vibration reduction measures include increasing pipe supports, using vibration dampers, changing pipe materials, installing buffer devices, and adjusting system frequency. Adding pipe supports at appropriate locations and reducing pipe span can reduce vibration amplitude; however, this significantly increases system complexity and cost, and may not completely eliminate vibration in some cases. Vibration dampers installed at certain locations on the pipeline can absorb vibration energy, but their effectiveness depends on their design and installation location; improper installation may not effectively reduce vibration. Changing pipe materials primarily involves using high-damping materials or composite materials to increase the pipe's damping characteristics; however, the cost of adding high-damping materials is high, sometimes exceeding the value of the pipeline to be vibration-damped, leading to cost overruns, and may not be suitable in certain environments. Installing buffer devices in the pipeline system, such as expansion joints and flexible hoses, can also reduce vibration and impact; however, these devices require regular maintenance and replacement and may increase system complexity. Adjusting the system frequency can also reduce vibration, mainly by changing the pipe length, diameter, or support method to adjust the system's natural frequency and avoid resonance; however, adjusting the system frequency may require complex calculations and design, and may be difficult to implement in some systems. Therefore, for systems with complex pipeline designs and significant impact from vibration and noise, targeted pipeline vibration reduction measures are essential. Summary of the Invention

[0004] The main objective of this invention is to propose a vibration reduction method for cooling pipes in electrical equipment, aiming to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention proposes a vibration reduction method for cooling pipes in electrical equipment. The internal flow channel of the electrical equipment includes a main cooling pipe connecting a water-cooled control box to external equipment, and an internal cooling pipe within the water-cooled control box. The vibration reduction method for the cooling pipes of the electrical equipment includes the following steps:

[0006] Step S100: Determine the fluid flow state of each original cooling pipe in the internal flow channel of the electrical equipment according to fluid dynamics theory;

[0007] Step S200: Determine the size range of the corresponding new cooling pipe based on the fluid flow state of each original cooling pipe;

[0008] Step S300: Based on the rated flow rate of the flow channel, determine the limit velocity range of the fluid at each key location in each of the new cooling pipes, wherein the key location is the location where a three-way valve or flow meter is installed in the internal cooling pipe of the water-cooled control box.

[0009] Step S400: Calculate the Reynolds number of the fluid at each of the key locations corresponding to the limiting velocity range;

[0010] Step S500: Measure the vibration values ​​of the pipes at each of the key locations in descending order of the multiple Reynolds numbers corresponding to the limiting flow velocity range of the fluid at each of the key locations, and compare them with the technical requirements of the electrical equipment. Take the pipe size corresponding to the vibration value that is smaller than the technical requirements as the preset size of the pipe at the key location, and set the multiple preset sizes as the preset size set of the pipe at the key location.

[0011] Step S600: Based on the dimensions of the pipes at adjacent key locations, take the preset size that has the smallest difference between the preset size set of the pipes at each key location and the dimensions of the pipes at adjacent key locations as the actual size of the pipe at that key location.

[0012] Step S700: Determine the model of the pipe at each of the key locations based on the actual dimensions of the pipe at each of the key locations.

[0013] Furthermore, the fluid flow state includes laminar flow, turbulent flow, and strong turbulent flow.

[0014] Furthermore, step S200 specifically includes:

[0015] Step S210: Determine the maximum size of each new cooling pipe based on the structure and size of the space where each original cooling pipe is located;

[0016] Step S220: Obtain the minimum size of each of the new cooling pipes by combining the fluid flow state of each of the original cooling pipes;

[0017] Step S230: Determine the size range of each of the new cooling pipes based on the maximum size and the minimum size, and obtain the minimum hydraulic diameter corresponding to each size.

[0018] Furthermore, step S300 specifically includes:

[0019] Step S310: Select a size from the size range for each of the new cooling pipes, and calculate the limit flow velocity of the fluid at each key location in each of the new cooling pipes according to the limit flow velocity calculation formula and the rated flow rate of the flow channel.

[0020] Step S320: Combine the limiting flow velocities of the fluid at each key location in each of the new cooling pipes under each dimension to obtain the limiting flow velocity range of the fluid at each key location in each of the new cooling pipes.

[0021] Furthermore, the formula for calculating the limiting flow velocity is k = (4Q / πl)², where k is the limiting flow velocity of the fluid at each critical location in each of the new cooling pipes of a certain size, Q is the rated flow rate of the flow channel, and l is the minimum hydraulic diameter corresponding to each of the critical locations of a certain size.

[0022] Furthermore, step S400 specifically includes:

[0023] The Reynolds number of the fluid at each of the key locations corresponding to the limiting velocity range is calculated according to the Reynolds number calculation formula, wherein the Reynolds number calculation formula is Re = (kl / μ), Re is the Reynolds number of the fluid at each of the key locations at a limiting velocity, and μ is the dynamic viscosity coefficient of the fluid.

[0024] Furthermore, step S500 specifically includes:

[0025] Step S510: Arrange the multiple Reynolds numbers calculated for the fluid at each of the key locations in descending order, and use the actual water flow test method to measure and test the vibration values ​​of the pipeline at the key locations in descending order of the multiple Reynolds numbers.

[0026] Step S520: Compare the multiple vibration values ​​with the technical requirement values ​​of the electrical equipment in sequence to obtain the pipe size corresponding to the vibration value that is smaller than the technical requirement value;

[0027] Step S530: The pipe size corresponding to the vibration value that is less than the technical requirement value is taken as the preset size of the pipe at the critical location, and the multiple preset sizes are set as the preset size set of the pipe at the critical location.

[0028] Furthermore, a transition cone pipe is provided between the pipe located at the critical position and its adjacent pipe.

[0029] Furthermore, the critical location is the location where the flow meter is installed, and a transition straight pipe is provided between the critical location and its adjacent pipe, and the diameter of the transition straight pipe is 5 times the diameter of the new cooling pipe.

[0030] In the technical solution of this invention, pipeline selection is performed by analyzing the fluid flow pattern and selecting a matching mode with the pipe size. This changes the fluid velocity and streamline condition inside the pipe, optimizes the fluid flow, reduces flow resistance, and reduces the severe pressure fluctuations caused by intense turbulence. Furthermore, the adjustment of pipe size eliminates abrupt changes in cross-section, improving the impedance matching degree of each component by 82%. This method does not require complex extreme fluid dynamics analysis and design, and can be easily applied to various systems. It does not require additional structures or vibration reduction equipment, achieving noise reduction without changing structural strength and electrical parameters. It is low-cost, saving 90% of the cost compared to traditional vibration reduction solutions (such as adding hydraulic dampers). In addition, this vibration reduction method has a wide range of applications. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 A flowchart of the vibration reduction method for cooling pipes of electrical equipment provided by the present invention.

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] Common pipeline vibration reduction measures include increasing pipe supports, using vibration dampers, changing pipe materials, installing buffer devices, and adjusting system frequency. Adding pipe supports at appropriate locations and reducing pipe span can reduce vibration amplitude; however, this significantly increases system complexity and cost, and may not completely eliminate vibration in some cases. Vibration dampers installed at certain locations on the pipeline can absorb vibration energy, but their effectiveness depends on their design and installation location; improper installation may not effectively reduce vibration. Changing pipe materials primarily involves using high-damping materials or composite materials to increase the pipe's damping characteristics; however, the cost of adding high-damping materials is high, sometimes exceeding the value of the pipeline to be vibration-damped, leading to cost overruns, and may not be suitable in certain environments. Installing buffer devices in the pipeline system, such as expansion joints and flexible hoses, can also reduce vibration and impact; however, these devices require regular maintenance and replacement and may increase system complexity. Adjusting the system frequency can also reduce vibration, mainly by changing the pipe length, diameter, or support method to adjust the system's natural frequency and avoid resonance; however, adjusting the system frequency may require complex calculations and design, and may be difficult to implement in some systems. Therefore, for systems with complex pipeline designs and significant impact from vibration and noise, targeted pipeline vibration reduction measures are essential.

[0038] In view of this, the present invention provides a method for vibration reduction of cooling pipes in electrical equipment, wherein the internal flow channel of the electrical equipment includes a main cooling pipe connecting a water-cooled control box to external equipment (such as a cooling tower, radiator, water pump, etc.), and an internal cooling pipe within the water-cooled control box. Figure 1 A flowchart of the vibration reduction method for cooling pipes of electrical equipment provided by the present invention.

[0039] Please see Figure 1 The vibration reduction method for the cooling pipes of the electrical equipment includes the following steps:

[0040] Step S100: Determine the fluid flow state of each original cooling pipe in the internal flow channel of the electrical equipment according to fluid dynamics theory.

[0041] Specifically, the fluid flow states include laminar flow, turbulent flow, and strong turbulent flow.

[0042] Step S200: Determine the size range of the corresponding new cooling pipe based on the fluid flow state of each original cooling pipe.

[0043] Furthermore, step S200 specifically includes:

[0044] Step S210: Determine the maximum size of each new cooling pipe based on the structure and size of the space where each original cooling pipe is located.

[0045] In this step, the dimensions of the space in which each of the original cooling pipes is located include the length, width, and height of the space.

[0046] Step S220: Obtain the minimum size of each of the new cooling pipes by combining the fluid flow state of each of the original cooling pipes.

[0047] Step S230: Determine the size range of each of the new cooling pipes based on the maximum size and the minimum size, and obtain the minimum hydraulic diameter corresponding to each size.

[0048] In this step, the size range of each of the new cooling pipes (DN1, DN2, DN3, DN4, ..., DN...) n (where n is the number of dimensions) is determined by the maximum dimension DN of each of the new cooling pipes. n The minimum size DN1 of each new cooling pipe is determined, and the minimum hydraulic diameter l corresponding to each size is determined according to the size DN of each new cooling pipe. Generally, the minimum hydraulic diameter l is equal to the pipe diameter d.

[0049] Step S300: Based on the size range of each of the new cooling pipes and the rated flow rate of the flow channel, determine the limit flow velocity range of the fluid at each key location in each of the new cooling pipes, wherein the key location is the location where a three-way valve or flow meter is installed in the internal cooling pipe of the water-cooled control box.

[0050] In other words, the critical position is located in the internal cooling pipes, but not in the main cooling pipes.

[0051] Furthermore, step S300 specifically includes:

[0052] Step S310: Select a size from the size range for each of the new cooling pipes, and calculate the limiting flow velocity of the fluid at each key location in each of the new cooling pipes according to the limiting flow velocity calculation formula and the rated flow rate of the flow channel.

[0053] Step S320: Combine the limiting flow velocities of the fluid at each key location in each of the new cooling pipes under each dimension to obtain the limiting flow velocity range of the fluid at each key location in each of the new cooling pipes.

[0054] In this step, the limiting flow velocities of the fluid are generally determined in ascending order of size to obtain the limiting flow velocity range of the fluid at each key location.

[0055] Furthermore, the formula for calculating the limiting flow velocity is k = (4Q / πl). 2 Where k is the limiting velocity of the fluid at each critical location in each of the new cooling pipes of a certain size, Q is the rated flow rate of the flow channel, and l is the minimum hydraulic diameter corresponding to each of the critical locations of a certain size.

[0056] Thus, the limiting velocity range of the fluid at each critical location in each of the new cooling pipes can be calculated as (k1, k2, k3, k4, ... k n ).

[0057] Step S400: Calculate the Reynolds number of the fluid at each of the key locations corresponding to the limiting velocity range.

[0058] Furthermore, step S400 specifically includes:

[0059] The Reynolds number of the fluid at each of the key locations corresponding to the limiting velocity range is calculated according to the Reynolds number calculation formula, wherein the Reynolds number calculation formula is Re = (kl / μ), Re is the Reynolds number of the fluid at each of the key locations at a limiting velocity, and μ is the dynamic viscosity coefficient of the fluid.

[0060] Thus, the Reynolds numbers of the fluid at each of the key locations corresponding to the limiting velocity range are Re1, Re2, ..., Re... n .

[0061] Step S500: Measure and test the vibration values ​​of the pipes at each of the key locations in descending order of the multiple Reynolds numbers corresponding to the limiting flow velocity range of the fluid at each of the key locations, and compare them with the technical requirements of the electrical equipment. Take the pipe size corresponding to the vibration value that is smaller than the technical requirements as the preset size of the pipe at the key location, and set the multiple preset sizes as the preset size set of the pipe at the key location.

[0062] Further, step S500 specifically includes:

[0063] Step S510: Arrange the multiple Reynolds numbers corresponding to the limiting flow velocity range at each of the key locations in descending order, and use the actual water flow test method to measure and test the vibration values ​​of the pipeline at the key locations in descending order of the multiple Reynolds numbers.

[0064] In this step, a vibration value is calculated based on a Reynolds number, that is, the vibration value of the pipe corresponding to each size within the size range of the pipe at each of the key locations is obtained.

[0065] Step S520: Compare the multiple vibration values ​​with the technical requirement values ​​of the electrical equipment in sequence to obtain the pipe size corresponding to the vibration value that is smaller than the technical requirement value.

[0066] In this step, vibration values ​​that are less than the technical requirements are selected, and the corresponding pipe dimensions are determined.

[0067] Step S530: The pipe size corresponding to the vibration value that is less than the technical requirement value is taken as the preset size of the pipe at the critical location, and multiple preset sizes are set as the preset size set of the pipe at the critical location.

[0068] In other words, the dimensions within the preset size set are all dimensions that meet the vibration reduction and noise reduction requirements of the pipe at the critical location.

[0069] Step S600: Based on the dimensions of the pipes at adjacent key locations, the preset size with the smallest difference between the preset size set of the pipes at each key location and the dimensions of the pipes at adjacent key locations is taken as the actual size of the pipe at that key location.

[0070] In other words, among a series of pipe dimensions that meet the vibration reduction and noise reduction requirements at each key location obtained through step S500, a final actual size is selected. Specifically, the actual size is determined based on the pipe dimensions at the two adjacent key locations before and after each key location. That is, the pipe size changes little at any three adjacent key locations to avoid vibration caused by sudden size changes.

[0071] It should be noted that after step S500 and before step S600, the preset size set of the pipes at each key location is determined a second time based on the bending form of each of the new cooling pipes. Specifically, the bending forms include using 90° bends (occupying a large space and having high flow resistance), using 45° bends (reducing flow resistance and space occupation, suitable for compact layout), and using 180° U-bends (used for pipe reversal, requiring a larger space to be reserved). That is to say, bends are provided to connect pipes in the new cooling pipes, and the pipe diameter of the bends must be consistent with the pipe diameter. However, it is necessary to consider the bending radius comprehensively. For example, choosing a short radius bend (narrow space) will enhance turbulence and lead to significant resistance, requiring the selection of a larger pipe diameter for compensation.

[0072] Step S700: Determine the model of the pipe at each of the key locations based on the actual dimensions of the pipe at each of the key locations.

[0073] It should be noted that due to the thickness and processing precision of the pipe, the specifications corresponding to the pipe model are not the actual dimensions of the pipe. The specific dimensions need to be confirmed with the pipe manufacturer.

[0074] Specifically, a transition tapered pipe is installed between the pipe at the critical location and its adjacent pipe. This avoids abrupt changes in cross-section and helps improve the flow field.

[0075] Furthermore, the cone angle of the transition cone tube is less than or equal to 15°.

[0076] Specifically, the key location is the location where the flow meter is installed. A transition straight pipe is provided between the key location and the adjacent pipe, and the diameter of the transition straight pipe is 5 times the diameter of the new cooling pipe, which is beneficial to improving the flow field.

[0077] The vibration reduction method for cooling pipes in electrical equipment provided by this invention selects pipes by analyzing the fluid flow pattern and pipe size to match the selected pattern. This changes the fluid velocity and streamline condition inside the pipe, optimizes the fluid flow, reduces flow resistance, and reduces the severe pressure fluctuations caused by intense turbulence. By standardizing the pipe diameter, it eliminates abrupt changes in cross-section, improving the impedance matching of various components by 82%. Furthermore, this method does not require complex extreme fluid dynamics analysis and design, making it easily applicable to various systems. It also eliminates the need for additional structures or vibration reduction equipment, achieving vibration and noise reduction without altering structural strength or electrical parameters. It is cost-effective, saving 90% of the cost compared to traditional vibration reduction solutions (such as adding hydraulic dampers). In addition, this vibration reduction method has a wide range of applications.

[0078] Furthermore, the present invention provides a specific embodiment to illustrate a method for vibration reduction of cooling pipes in electrical equipment.

[0079] In a specific embodiment of the present invention, during a vibration and noise test of an inverter power supply, it was found that the vibration value at the monitoring point exceeded the required index. By shutting down the equipment and conducting a vibration test with only water flow, the vibration value at the mounting feet exceeded 96 dB (ambient 76.7 dB). Simultaneously, touching the inlet and outlet pipes of the water-cooled control box revealed obvious water turbulence. Based on the on-site testing of the fault symptoms, the preliminary diagnosis was that the excessive vibration of the main inverter power supply prototype was due to water flow vibration in the inlet and outlet pipes of the water-cooled control box. The external circulation water flow rate of the main inverter power supply's heat dissipation device is 45 L / min. The main cooling pipe is DN25 (inner diameter 25.0 ± 0.2 mm). The internal pipes of the water-cooled control box are equipped with devices such as three-way valves, flow meters, and temperature probes. The internal pipes of the water-cooled control box are DN20 (inner diameter 19.0 ± 0.2 mm). The minimum pipe diameter within the three-way valve device and the minimum pipe diameter within the flow meter device in the internal pipes of the water-cooled control box are 14 ± 0.1 mm and 19 ± 0.2 mm respectively.

[0080] Based on the vibration reduction method for electrical equipment cooling pipes, the pipe diameter range is redesigned, including the following steps:

[0081] Step S100: Determine the fluid flow state of each original cooling pipe in the internal flow channel of the electrical equipment according to fluid mechanics theory. Specifically, Bernoulli's equation and Reynolds number formula: Re = ρvd / μ are used for calculation, where: at a water temperature of 30℃, the dynamic viscosity μ = 0.798 × 10⁻³ Pa·s, and the density ρ = 995.6 kg / m³. The calculation results are shown in Table 1. Analysis shows that the flow velocity is the highest at the smallest pipe cross-section inside the three-way valve, corresponding to the highest Reynolds number, reaching over 6500. The turbulence is severe, and excessive pulsating stress will aggravate the impact vibration of the fluid on the pipe wall. Combining theoretical calculations and experimental results, the flow characteristics are thoroughly identified during the design of the electrical equipment cooling pipe. Based on the water supply velocity and the pipe model of the internal pipe being DN20, the calculated internal flow velocity and Re at the smallest cross-section are significantly too high, and the turbulence at the corresponding location is aggravated, resulting in excessive impact vibration. Furthermore, this is mismatched with the main cooling pipe, further increasing the vibration.

[0082] Table 1

[0083]

[0084] Step S200: Based on the fluid flow state of each of the original cooling pipes, determine that the size range of the new cooling pipe corresponding to the main cooling pipe is 18~25mm (specifically 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm), and the size range of the new cooling pipe corresponding to the internal cooling pipe is 18~25mm (specifically 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm).

[0085] Step S300: Based on the rated flow rate of the flow channel, determine the limiting velocity range of the fluid at the three-way valve (≤4m / s) and the limiting velocity range of the fluid at the flow meter (≤2m / s).

[0086] Step S400: Calculate the Reynolds number of the fluid at the three-way valve corresponding to the limiting flow velocity range (≤57682) according to the Reynolds number calculation formula, and calculate the Reynolds number of the fluid at the flow meter corresponding to the limiting flow velocity range (≤39415).

[0087] Step S500: Measure the vibration values ​​at the three-way valve (flow meter) in descending order of the Reynolds numbers corresponding to the limiting flow velocity range, and compare them with the technical requirements of the electrical equipment (specifically, low-frequency noise value ≤ 80dB, high-frequency noise value ≤ 82dB). Use the pipe size corresponding to the vibration value that is less than the technical requirements as the preset pipe size at the three-way valve (flow meter), and combine the preset sizes into a preset size set for the pipe at the three-way valve (flow meter).

[0088] Step S600: Based on the dimensions of the pipes at adjacent key locations (three-way valve, flow meter) of each key location, the preset size with the smallest difference between the preset size set of the pipes at each key location and the dimensions of the pipes at adjacent key locations is taken as the actual size of the pipe at that key location. Finally, the actual size of the pipe at the three-way valve is determined to be 18mm and the actual size of the pipe at the flow meter is determined to be 24mm.

[0089] Step S700: Determine the pipe model as DN25 based on the actual dimensions of the pipe at each of the key locations.

[0090] Specifically, the comparison results before and after pipeline optimization using vibration reduction methods for electrical equipment cooling pipelines are shown in Table 2 below:

[0091] Table 2

[0092]

[0093] In other words, after optimizing the piping using vibration reduction methods for electrical equipment cooling pipes, the estimated flow velocity and Reynolds number at the smallest cross-section of components, as well as the degree of turbulence, are significantly reduced, with both high- and low-frequency noise levels below 80dB. Furthermore, using this method for piping optimization does not involve changes to structural strength or electrical controls, will not weaken existing functions, and will not negatively impact other coupled equipment.

[0094] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for vibration reduction of cooling pipes in electrical equipment, wherein the internal flow channel of the electrical equipment includes a main cooling pipe connecting a water-cooled control box to external equipment, and an internal cooling pipe within the water-cooled control box, characterized in that... The vibration reduction method for the cooling pipes of the electrical equipment includes the following steps: Step S100: Determine the fluid flow state of each original cooling pipe in the internal flow channel of the electrical equipment according to fluid dynamics theory; Step S200: Determine the size range of the corresponding new cooling pipe based on the fluid flow state of each original cooling pipe; Step S300: Based on the rated flow rate of the flow channel, determine the limit velocity range of the fluid at each key location in each of the new cooling pipes, wherein the key location is the location where a three-way valve or flow meter is installed in the internal cooling pipe of the water-cooled control box. Step S400: Calculate the Reynolds number of the fluid at each of the key locations corresponding to the limiting velocity range; Step S500: Measure the vibration values ​​of the pipes at each of the key locations in descending order of the multiple Reynolds numbers corresponding to the limiting flow velocity range of the fluid at each of the key locations, and compare them with the technical requirements of the electrical equipment. Take the pipe size corresponding to the vibration value that is smaller than the technical requirements as the preset size of the pipe at the key location, and set the multiple preset sizes as the preset size set of the pipe at the key location. Step S600: Based on the dimensions of the pipes at adjacent key locations, take the preset size that has the smallest difference between the preset size set of the pipes at each key location and the dimensions of the pipes at adjacent key locations as the actual size of the pipe at that key location. Step S700: Determine the model of the pipe at each of the key locations based on the actual dimensions of the pipe at each of the key locations.

2. The vibration reduction method for electrical equipment cooling pipes as described in claim 1, characterized in that, The fluid flow states include laminar flow, turbulent flow, and strong turbulent flow.

3. The vibration reduction method for electrical equipment cooling pipes as described in claim 2, characterized in that, Step S200 specifically includes: Step S210: Determine the maximum size of each new cooling pipe based on the structure and size of the space where each original cooling pipe is located; Step S220: Obtain the minimum size of each of the new cooling pipes by combining the fluid flow state of each of the original cooling pipes; Step S230: Determine the size range of each of the new cooling pipes based on the maximum size and the minimum size, and obtain the minimum hydraulic diameter corresponding to each size.

4. The vibration reduction method for electrical equipment cooling pipes as described in claim 2, characterized in that, Step S300 specifically includes: Step S310: Select a size from the size range for each of the new cooling pipes, and calculate the limit flow velocity of the fluid at each key location in each of the new cooling pipes according to the limit flow velocity calculation formula and the rated flow rate of the flow channel. Step S320: Combine the limiting flow velocities of the fluid at each key location in each of the new cooling pipes under each dimension to obtain the limiting flow velocity range of the fluid at each key location in each of the new cooling pipes.

5. The vibration reduction method for electrical equipment cooling pipes as described in claim 4, characterized in that, The formula for calculating the limiting velocity is as follows: Where k is the limiting velocity of the fluid at the critical location under a certain size, Q is the rated flow rate of the flow channel, and l is the minimum hydraulic diameter corresponding to the critical location under a certain size.

6. The vibration reduction method for electrical equipment cooling pipes as described in claim 5, characterized in that, Step S400 specifically includes: The Reynolds number of the fluid at each of the key locations corresponding to the limiting velocity range is calculated according to the Reynolds number calculation formula, wherein the Reynolds number calculation formula is Re = (kl / μ), Re is the Reynolds number of the fluid at each of the key locations at a limiting velocity, and μ is the dynamic viscosity coefficient of the fluid.

7. The vibration reduction method for electrical equipment cooling pipes as described in claim 6, characterized in that, Step S500 specifically includes: Step S510: Arrange the multiple Reynolds numbers calculated for the fluid at each of the key locations in descending order, and use the actual water flow test method to measure and test the vibration values ​​of the pipeline at the key locations in descending order of the multiple Reynolds numbers. Step S520: Compare the multiple vibration values ​​with the technical requirement values ​​of the electrical equipment in sequence to obtain the pipe size corresponding to the vibration value that is smaller than the technical requirement value; Step S530: The pipe size corresponding to the vibration value that is less than the technical requirement value is taken as the preset size of the pipe at the critical location, and multiple preset sizes are set as the preset size set of the pipe at the critical location.

8. The vibration reduction method for cooling pipes of electrical equipment as described in claim 1, characterized in that, A transition cone pipe is installed between the pipe located at the critical position and its adjacent pipe.

9. The vibration reduction method for cooling pipes of electrical equipment as described in claim 1, characterized in that, The critical location is the location where the flow meter is installed. A transition straight pipe is provided between the critical location and the adjacent pipe, and the diameter of the transition straight pipe is 5 times the diameter of the new cooling pipe.

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