阅读说明：本技术 一种用于消除内部振动的变频器安装支架的处理方法 (Processing method of frequency converter mounting bracket for eliminating internal vibration ) 是由 张海涛 于 2020-05-06 设计创作，主要内容包括：本发明公开了一种用于消除内部振动的变频器安装支架的处理方法,涉及变频器技术领域,具体方法如下：1)制备分散相溶液；2)对安装支架表面同步进行喷射纺丝以及喷雾处理；3)将安装支架浸渍在含有二亚苄基山梨醇的溶液中；4)将烘干后的安装支架浸渍于两步溶液中,再进行凝胶和溶剂置换处理,经常压干燥后即可完成。本发明通过采用同步的喷射纺丝和喷雾处理工艺,在变频器安装支架的表面构建由纳米纤维网和凝胶层互相穿插形成的具有很好的弹性缓冲作用复合凝胶层,可以在变频器组件和安装支架之间以及安装支架和变频器壳体之间起到很好的减震作用,对变频器内部产生的震动具有很好的消除效果,从而可以减少变频器在工作中出现震动。(The invention discloses a processing method of a frequency converter mounting bracket for eliminating internal vibration, which relates to the technical field of frequency converters and comprises the following specific steps: 1) preparing a dispersed phase solution; 2) synchronously carrying out jet spinning and spraying treatment on the surface of the mounting bracket; 3) dipping the mounting bracket in a solution containing dibenzylidene sorbitol; 4) and (3) soaking the dried mounting bracket in the two-step solution, performing gel and solvent replacement treatment, and drying under normal pressure to obtain the finished product. According to the invention, by adopting synchronous jet spinning and spraying treatment processes, the composite gel layer with good elastic buffering effect is formed by mutually inserting the nano-fiber net and the gel layer on the surface of the frequency converter mounting bracket, so that a good damping effect can be achieved between the frequency converter assembly and the mounting bracket and between the mounting bracket and the frequency converter shell, and a good eliminating effect can be achieved on vibration generated in the frequency converter, thereby reducing vibration of the frequency converter during working.)

1. A processing method of a frequency converter mounting bracket for eliminating internal vibration is characterized by comprising the following steps:

1) dissolving a certain amount of glycerol in deionized water at the temperature of 80-90 ℃, heating the solution to 110 ℃ after stirring and dissolving, adding a proper amount of polyvinyl alcohol into the solution, continuously stirring for 1-2 hours to uniformly mix the polyvinyl alcohol, removing bubbles in the mixed solution by using an ultrasonic cleaning device to obtain a mixed solution, adding a certain amount of 3-epoxybutyronitrile resin into the nano-cellulose solution, mechanically mixing and stirring the mixture uniformly, adding the mixture into the mixed solution, and performing 300-400W ultrasonic treatment for 25-35min to obtain a dispersed phase solution;

2) weighing a certain amount of polyacrylonitrile, completely dissolving the polyacrylonitrile in a dimethylformamide solution under the condition of heating and stirring in a water bath at 40-50 ℃, then adding a proper amount of a stabilizer, an adhesion promoter and a dispersant to prepare a spinning solution, injecting the spinning solution serving as a raw material into a jet spinning device, injecting a dispersion phase solution into a spraying device, simultaneously and synchronously carrying out jet spinning and spraying treatment, so that the spinning solution is drawn to form disordered fibers which are stacked on the surface of a polished frequency converter mounting bracket, after the spinning is finished, placing the frequency converter mounting bracket in liquid nitrogen for fast freezing for 3-5min, then placing the frequency converter mounting bracket in a vacuum freeze dryer for freeze drying, and then carrying out vacuum heating treatment;

3) weighing a certain amount of dibenzylidene sorbitol, adding the dibenzylidene sorbitol into a decanol solution under the conditions of heating in a water bath at the temperature of between 80 and 90 ℃ and stirring at the speed of 150r/min for 1 to 2 hours to prepare a solution with the mass concentration of between 0.2 and 0.6 percent, then keeping the temperature unchanged, soaking a processed frequency converter mounting bracket in the solution for 30 to 40 seconds, taking out the solution, cooling to room temperature, and placing the solution in a vacuum oven to be heated until the solution is completely dried;

4) selecting ethyl orthosilicate, ethanol, distilled water, hydrochloric acid and ammonia water as raw materials according to a molar ratio of 1:3-4:1:7 × 10^-4Mixing ethyl orthosilicate, ethanol, distilled water and hydrochloric acid, stirring until a uniform and clear solution is obtained to obtain sol A, and then mixing according to the mole ratioThe ratio of 5-6:2-3:2 × 10^-3Mixing ethanol, distilled water and ammonia water to prepare a solution B, then soaking the frequency converter mounting bracket in the sol A for 5-10min, taking out and soaking in the solution B for 5-10min, taking out the soaked frequency converter mounting bracket, gelling for 2-3h at room temperature, then soaking in an absolute ethanol solution for 20-24h at 50-60 ℃, then carrying out solvent replacement for 2-3d at room temperature by using absolute ethanol, and drying at normal pressure to finish the treatment of the frequency converter mounting bracket.

2. The method for processing a frequency converter mounting bracket for eliminating internal vibration according to claim 1, wherein in the step 1), the mass ratio of glycerol, polyvinyl alcohol and deionized water in the raw materials is 0.5-0.8:5-6: 30-40; the rotating speed of the continuous stirring is 100-150 r/min; the frequency of the ultrasonic cleaning device is 40-100KHz, and the processing time is 10-20 min.

3. The method for processing a frequency converter mounting bracket for eliminating internal vibration as claimed in claim 1, wherein in the step 1), the solid content of the nanocellulose in the obtained dispersion phase solution is 5-8%; the addition amount of the 3-epoxy butyronitrile resin is 3-6% of the solid content of the nano-cellulose.

4. The method for processing a frequency converter mounting bracket for canceling internal vibration according to claim 1, wherein in the step 2), the mass ratios of the polyacrylonitrile, the stabilizer, the adhesion promoter and the dispersant to the spinning solution are 15 to 20%, 1 to 5%, 0.5 to 2% and 0.3 to 1.5%, respectively.

5. The method for processing a mounting bracket of a frequency converter for eliminating internal vibration as claimed in claim 1, wherein in the step 2), the stabilizer is one or more of ferrous sulfate, isonicotinic acid and phenols; the adhesion promoter is one or more of silane coupling agent, titanate coupling agent and zirconium aluminate coupling agent; the dispersing agent is one or more of water glass, sodium pyrophosphate and sodium hexametaphosphate.

6. The method for processing a frequency converter mounting bracket for eliminating internal vibration according to claim 1, wherein in the step 2), the temperature of freeze drying is-40 to-50 ℃, and the drying time is 2 to 3 hours; the temperature of the vacuum heating treatment is 105-115 ℃, and the vacuum heating is carried out for 3-4 h.

7. The method for processing the frequency converter mounting bracket for eliminating the internal vibration as claimed in claim 1, wherein in the step 2), the spinneret hole diameter of the jet spinning device is 0.3-0.6mm, and the air gap width is 0.4-0.5 mm; the technological parameters of the jet spinning are as follows: the air pressure of the jet spinning device is 0.05-0.15MPa, the feeding speed is 7-10ml/h, the thickness is 0.4-0.8mm, and the receiving distance is 80-100 cm; the nozzle diameter of the spraying device is 0.5-1.0mm, and the gas pressure is 0.3-0.5 MPa.

8. A method of treating a transducer mounting bracket for canceling internal vibrations according to claim 1, wherein in step 4), the temperature of the vacuum oven is 50-60 ℃.

9. The method for treating the frequency converter mounting bracket for eliminating the internal vibration as claimed in claim 1, wherein in the step 3), the concentration of the hydrochloric acid solution is 10-12 mol/L, the concentration of the ammonia water is 1-1.5 mol/L, the solvent is replaced every 1d in the solvent replacement process, the temperature of the normal pressure drying is 70-80 ℃, and the drying time is 4-5 h.

10. The method for processing a mounting bracket of a frequency converter for eliminating internal vibration as set forth in claim 1, wherein the step 3) is performed by the following steps before the atmospheric drying: the mounting bracket is firstly placed in n-hexane solution for solvent replacement for 1-2d, then soaked in a trimethylchlorosilane/n-hexane mixed solution with a volume ratio of 1:8-10 at room temperature for 20-30h, taken out and then placed in the n-hexane solution for soaking for 15-20 h.

Technical Field

The invention belongs to the technical field of frequency converters, and particularly relates to a processing method of a frequency converter mounting bracket for eliminating internal vibration.

Background

The frequency converter is a power control device which applies frequency conversion technology and microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor, and mainly comprises a rectification unit (alternating current to direct current), a filtering unit, an inversion unit (direct current to alternating current), a braking unit, a driving unit, a detection unit and a microprocessing unit. With the rapid development of modern power electronic technology and microelectronic technology, high-voltage high-power variable-frequency speed regulation devices are continuously mature, and the high-voltage problem which is difficult to solve originally is solved well in recent years by the series connection of devices or the series connection of units. The high-voltage high-power variable-frequency speed regulation device is widely applied to various fans, water pumps, compressors, rolling mills and the like in industries such as large-scale mining production plants, petrochemical industry, municipal water supply, metallurgical steel, electric power energy and the like.

The frequency converter can often appear vibrations in work, not only can shorten the life of frequency converter, and the noise that produces moreover causes the injury to the human body. At present, a damping device is mainly externally connected to a shell of the frequency converter, but the externally connected damping device can only play a role in damping external vibration to the frequency converter, and does not have a function of eliminating vibration generated by resonance caused by harmonic waves output by a circuit in the process of working inside the frequency converter. In the prior art, a technical scheme for solving the problem of vibration generated inside the frequency converter is provided, for example, Chinese utility model patent CN208691144U discloses a frequency converter with a damping structure, a damping support is arranged in a frequency converter shell, a groove for installing a circuit board is arranged on the damping support, a damping pad is arranged in the groove, connecting grooves are arranged at two axial ends of the damping support, a first spring is arranged in each connecting groove, the frequency converter shell is provided with a mounting groove corresponding to each connecting groove, a second spring is arranged in each mounting groove, the mounting groove is connected with the connecting grooves through a connecting piece, one end of each connecting piece extends into each connecting groove to be abutted against the first spring, the other end of each connecting piece extends into each mounting groove to be abutted against the second spring, the damping support is constructed in the frequency converter so as to eliminate vibration inside the frequency converter, but the constructed damping support occupies a larger, the size and the weight of the frequency converter are increased, and the damping support constructed in the long-term use process can generate plastic deformation and even fatigue fracture of the installed spring, so that the damping effect cannot be achieved, and new vibration noise can be generated.

Disclosure of Invention

The invention aims to solve the existing problems and provides a processing method of a frequency converter mounting bracket for eliminating internal vibration.

The invention is realized by the following technical scheme:

a processing method of a frequency converter mounting bracket for eliminating internal vibration comprises the following specific steps:

1) dissolving 0.5-0.8 part of glycerol in 30-40 parts of 80-90 ℃ deionized water, heating the solution to 110 ℃ after stirring and dissolving, adding 5-6 parts of polyvinyl alcohol, continuously stirring for 1-2 hours at 150r/min of 100-; according to the dispersed phase solution provided by the invention, glycerol and polyvinyl alcohol are used as a first network, the strong hydrogen bond effect between the glycerol and the polyvinyl alcohol can endow the gel with high mechanical property, the nanocellulose is used as a second network, the toughness and elasticity of the gel can be improved, and the 3-epoxy butyronitrile resin is used as a cross-linking agent resin, so that the cross-linking reaction can be promoted, and the dispersed phase solution can be cross-linked on a nanofiber network substrate to form a gel layer with a stable three-dimensional network structure;

2) weighing a certain amount of polyacrylonitrile, completely dissolving the polyacrylonitrile in a dimethylformamide solution under the condition of heating and stirring in a water bath at 40-50 ℃, then adding a proper amount of a stabilizer, an adhesion promoter and a dispersant to prepare a spinning solution, injecting the spinning solution serving as a raw material into a jet spinning device, injecting a dispersion phase solution into a spraying device, simultaneously and synchronously carrying out jet spinning and spraying treatment, so that the spinning solution is drawn to form disordered fibers which are stacked on the surface of a polished frequency converter mounting bracket, after the spinning is finished, placing the mounting bracket in liquid nitrogen for fast freezing for 3-5min, then placing the mounting bracket into a vacuum freeze dryer, carrying out freeze drying for 2-3h at-40 to-50 ℃, and carrying out vacuum heating treatment for 3-4h at 105-115 ℃; the invention adopts synchronous jet spinning and spray treatment process to treat the surface of the frequency converter mounting bracket, uses polyacrylonitrile as spinning raw material, leads the polyacrylonitrile to be rapidly drawn into fiber by jet spinning, and orderly stacked and attached to the surface of the frequency converter mounting bracket to form a nano-fiber mesh substrate, sprays dispersion phase solution on the nano-fiber mesh substrate while carrying out jet spinning, can promote the cross-linking reaction of cross-linking agent resin to form gel by freeze drying and vacuum heating treatment, and leads the formed gel and the nano-fiber mesh to be mutually interpenetrated because the jet spinning and the spray treatment are carried out synchronously, the nano-fiber mesh interpenetrated in the gel layer can lead the stress of the gel layer to be more balanced when the gel layer is vibrated, can resist partial deformation, and can play a role of preventing the gel layer from cracking, the integrity of the elastic gel layer is improved, and the nanofiber net and the frequency converter mounting bracket have strong binding force, so that the function of fixing the gel layer can be achieved, and the gel layer is prevented from falling off;

3) weighing a certain amount of dibenzylidene sorbitol, adding the dibenzylidene sorbitol into a decanol solution under the conditions of heating in a water bath at 80-90 ℃ and stirring at 150r/min for 1-2h to prepare a solution with the mass concentration of 0.2-0.6%, then keeping the temperature unchanged, soaking the treated frequency converter mounting bracket in the solution for 30-40s, taking out the solution, cooling to room temperature, and placing the solution in a vacuum oven at 50-60 ℃ to be heated until the solution is completely dried; according to the invention, the frequency converter mounting bracket is immersed in the solution containing the dibenzylidene sorbitol, so that the dibenzylidene sorbitol grows in situ in the polyacrylonitrile nano-fiber net, the dibenzylidene sorbitol is introduced into the nano-fiber net, and the multi-stage nano-structure of the self-assembly nano-fiber-spinning nano-fiber is generated, thereby effectively improving the mechanical property of the nano-fiber net and improving the deformation resistance of the nano-fiber net;

4) selecting ethyl orthosilicate, ethanol, distilled water, hydrochloric acid with the concentration of 10-12 mol/L and ammonia water with the concentration of 1-1.5 mol/L as raw materials according to the molar ratio of 1:3-4:1:7 × 10^-4Mixing and stirring ethyl orthosilicate, ethanol, distilled water and hydrochloric acid until a uniform and clear solution is obtained to obtain sol A, and then mixing the sol A and the sol A according to the molar ratio of 5-6:2-3:2 × 10^-3Mixing ethanol, distilled water and ammonia water to prepare a solution B, then soaking the frequency converter mounting bracket in the sol A for 5-10min, taking out and soaking in the solution B for 5-10min, taking out the soaked mounting bracket, gelling for 2-3h at room temperature, then soaking in an absolute ethanol solution for 20-24h at 50-60 ℃, then carrying out solvent replacement for 2-3d with absolute ethanol at room temperature, wherein the absolute ethanol environment needs to be updated every 1d, and then drying at 70-80 ℃ under normal pressure for 4-5h to complete the treatment of the frequency converter mounting bracket; the gel layer formed by the invention contains two network chains, wherein the first network chain is composed of glycerol and polyvinyl alcohol, and is easy to dissolve in water, so that in order to avoid the influence on the structure of the gel caused by the swelling of the first network chain, the invention adopts a simple dipping method, and silicon dioxide particles are introduced into the gel matrix, so that the hydrophobicity of the gel layer can be improved, water molecules can be prevented from permeating and filling in the pores of the gel, and the damage to the gel structure can be prevented.

Preferably, in the step 2), the mass ratios of polyacrylonitrile, stabilizer, adhesion promoter and dispersant to the spinning solution are respectively 15-20%, 1-5%, 0.5-2% and 0.3-1.5%.

Preferably, in the step 2), the stabilizer is one or more of ferrous sulfate, isonicotinic acid and phenols; the adhesion promoter is one or more of silane coupling agent, titanate coupling agent and zirconium aluminate coupling agent; the dispersing agent is one or more of water glass, sodium pyrophosphate and sodium hexametaphosphate.

Preferably, in the step 2), the hole diameter of the spinneret of the jet spinning device is 0.3-0.6mm, and the width of the air gap is 0.4-0.5 mm; the technological parameters of the jet spinning are as follows: the air pressure of the jet spinning device is 0.05-0.15MPa, the feeding speed is 7-10ml/h, the thickness is 0.4-0.8mm, and the receiving distance is 80-100 cm; the nozzle diameter of the spraying device is 0.5-1.0mm, and the gas pressure is 0.3-0.5 MPa.

Preferably, in the step 4), the following treatment is performed before the atmospheric drying: firstly, placing the mounting bracket in a normal hexane solution for solvent replacement for 1-2d, then soaking the mounting bracket in a trimethylchlorosilane/normal hexane mixed solution with a volume ratio of 1:8-10 at room temperature for 20-30h, taking out the mounting bracket, and then placing the mounting bracket in the normal hexane solution for soaking for 15-20 h; the Si-CH is formed in the composite gel layer by modifying the formed composite gel layer with trimethylchlorosilane before drying₃And Si-O-Si chemical bonds, so that stable chemical bond connection is formed between the nano-cellulose and the silicon dioxide particles, and the phenomenon of structural collapse generated in the drying process can be avoided.

Compared with the prior art, the invention has the following advantages:

according to the treatment process provided by the invention, by adopting the synchronous jet spinning and spraying treatment process, the composite gel layer formed by mutually inserting the nanofiber net and the gel layer is constructed on the surface of the frequency converter mounting bracket, the composite gel layer has a good elastic buffering effect, can play a good damping role between the frequency converter assembly and the mounting bracket and between the mounting bracket and the frequency converter shell, and has a good elimination effect on vibration generated inside the frequency converter, so that the vibration of the frequency converter in the working process can be reduced, the service life of the frequency converter can be prolonged, and the generation of noise can be reduced.

Detailed Description

The present invention will be further described with reference to specific embodiments.