阅读说明：本技术 一种断路器灭弧室内装零部件表面异物处理方法 (Method for treating foreign matters on surfaces of parts in arc extinguishing chamber of circuit breaker ) 是由 王斌 金光耀 张学刚 张颖杰 陈思远 李春迎 王珊 张央央 申健 李润清 李晓征 于 2020-12-14 设计创作，主要内容包括：本发明属于高压电气类产品的防护领域,具体涉及一种断路器灭弧室内装零部件表面异物处理方法。该表面异物处理方法包括以下步骤：将待处理零部件喷砂或抛丸处理后依次进行脱脂、酸洗、超声波清洗、钝化和高压水清洗,然后在零部件的非导电连接部位制备涂层。本发明的内装零部件表面异物处理方法,通过抛丸、脱脂、酸洗、超声波清洗、钝化、高压水清洗等多个处理环节,能够有效解决内装件表面残留异物的问题,提高零部件表面质量,经表面涂装处理后,保证在运行过程中无异物散落,有效降低因金属异物存在而引发的放电事故。(The invention belongs to the field of protection of high-voltage electrical products, and particularly relates to a method for treating foreign matters on the surfaces of parts in an arc extinguishing chamber of a circuit breaker. The surface foreign matter treatment method comprises the following steps: after sand blasting or shot blasting treatment is carried out on the parts to be treated, degreasing, acid cleaning, ultrasonic cleaning, passivation and high-pressure water cleaning are carried out in sequence, and then coatings are prepared on the non-conductive connecting parts of the parts. The method for treating the foreign matters on the surface of the internal parts can effectively solve the problem of foreign matters remaining on the surface of the internal parts through a plurality of treatment links such as shot blasting, degreasing, acid washing, ultrasonic cleaning, passivation, high-pressure water cleaning and the like, improve the surface quality of the parts, ensure no foreign matters to scatter in the operation process after surface coating treatment, and effectively reduce discharge accidents caused by the existence of the metal foreign matters.)

1. A method for treating foreign matters on the surfaces of parts in an arc extinguish chamber of a circuit breaker is characterized by comprising the following steps: after sand blasting or shot blasting treatment is carried out on the parts to be treated, degreasing, acid cleaning, ultrasonic cleaning, passivation and high-pressure water cleaning are carried out in sequence, and then coatings are prepared on the non-conductive connecting parts of the parts.

2. The method for treating the foreign matters on the surfaces of the parts in the arc extinguishing chamber of the circuit breaker according to claim 1, wherein the roughness is controlled by the sand blasting or shot blasting treatment to be Ra6.3-12.5.

3. The method for treating the foreign matters on the surfaces of the parts in the arc extinguishing chamber of the circuit breaker as claimed in claim 1, wherein the acid washing is nitric acid solution cleaning, the nitric acid solution is prepared by nitric acid with the mass fraction of 60-70% and water, the addition amount of the nitric acid is 400-600ml/L, and the acid washing time is 30-60 s.

4. The method for treating the foreign matters on the surfaces of the parts in the arc extinguishing chamber of the circuit breaker as claimed in claim 1, wherein the ultrasonic cleaning is carried out at an ultrasonic power of 35 to 45kW, a frequency of 35 to 45kHz and an ultrasonic cleaning time of 5 to 10 min.

5. The method for treating foreign matters on the surfaces of parts in an arc extinguishing chamber of a circuit breaker according to claim 1, wherein the pressure for cleaning the parts with high-pressure water is 30 to 50 MPa.

6. The method for treating foreign matters on the surfaces of parts in an arc chamber of a circuit breaker according to claim 1, wherein the passivation is chromium-free passivation, and the treatment time is 5-10 min.

7. The method for treating foreign matters on the surface of parts in an arc chamber of a circuit breaker according to any one of claims 1 to 6, wherein the coating is a varnish layer with a thickness of 20 to 80 μm.

8. The method for treating foreign matters on the surfaces of parts in an arc chamber of a circuit breaker according to claim 7, wherein the preparing of the coating comprises spraying a water-based varnish and then drying at 80-100 ℃.

Technical Field

The invention belongs to the field of protection of high-voltage electrical products, and particularly relates to a method for treating foreign matters on the surfaces of parts in an arc extinguishing chamber of a circuit breaker.

Background

The circuit breaker explosion chamber is the important part of GIS system, and the dress spare part plays the effect of switching on and bearing current in the circuit breaker explosion chamber. Parts in an arc chamber of the circuit breaker are generally made of aluminum alloy and are formed by processes of spinning, casting, machining and the like. Before the aluminum alloy parts are assembled to the arc extinguish chamber of the circuit breaker, the aluminum alloy parts are generally treated by alkali washing, degreasing and the like to remove surface oil stains and tiny metal foreign matters, and further ensure the surface quality of the parts.

When the parts made of the materials are formed, metal chips and fine metal particles are attached to the surfaces of the parts, which is unavoidable, and after the oil stains on the surfaces of the parts are removed by using a conventional degreasing solution, the fine metal chips cannot be completely removed, and if the degreasing or pickling time is prolonged, a large amount of metal chips can be removed from the surfaces of the parts, but the substrates of the metal parts are corroded. After the surface of the part is pasted by using a 3M adhesive tape after the conventional degreasing and pickling time treatment, 3-5mm of metal wires or small metal powder and scraps on the adhesive tape can still be observed.

When the circuit breaker operates, especially when the circuit breaker operates in a megavolt class, because the internal components are at a high potential, if tiny metal foreign matters (such as metal wires, metal ash and the like) remain on the surface of a high potential electrode, the insulation level of a product is reduced in the live-line operation, and the risk of inducing discharge exists. The discharge accident may occur when the foreign matter on the surface of the mounted member is scattered. The foreign matter treatment level of the surfaces of the parts is improved, the scattering risk of the foreign matters is reduced, and the method has important significance for improving the operation reliability of the GIS system.

Disclosure of Invention

The invention aims to provide a method for treating foreign matters on the surfaces of parts in an arc extinguish chamber of a circuit breaker, which can effectively reduce the residual foreign matters on the surfaces of the parts and ensure that the parts are free from scattering of foreign matters in the system running process.

In order to achieve the aim, the technical scheme of the method for treating the foreign matters on the surfaces of the parts in the arc extinguish chamber of the circuit breaker is as follows:

a method for treating foreign matters on the surfaces of parts in an arc extinguish chamber of a circuit breaker comprises the following steps: after sand blasting or shot blasting treatment is carried out on the parts to be treated, degreasing, acid cleaning, ultrasonic cleaning, passivation and high-pressure water cleaning are carried out in sequence, and then coatings are prepared on the non-conductive connecting parts of the parts.

The components installed in the arc chamber of a circuit breaker typically include shields, electrical connections, bent conductors, end flanges, etc. The internal parts are made of aluminum alloy and are formed by processes such as spinning, casting, machining and the like.

The method for treating the foreign matters on the surface of the internal parts can effectively solve the problem of foreign matters remaining on the surface of the internal parts through a plurality of treatment links such as shot blasting, degreasing, acid washing, ultrasonic cleaning, high-pressure water cleaning and the like, improve the surface quality of the parts, ensure no foreign matters to scatter in the operation process after surface coating treatment, and effectively reduce discharge accidents caused by the existence of the metal foreign matters.

Removing oxide skin on the surface of the part by sand blasting or shot blasting, and controlling the surface roughness of the part. Preferably, the roughness of the sand blasting or shot blasting treatment is controlled to be Ra6.3-12.5. The shot used for shot blasting is made of stainless steel, and the grain diameter is 0.8 mm.

The degreasing process is mainly used for removing oil stains on the surface of the workpiece. When in cleaning, the travelling crane is used to make the workpiece swing up and down for 2-3 times, so that the parts containing inner cavities or blind holes are effectively cleaned, and the cleaning time can be properly prolonged according to the oil stain condition on the surface of the workpiece. The degreasing agent adopted in the process can adopt the existing commercial finished product, and preferably, the degreasing temperature is 60-70 ℃ and the time is 3-5 min.

The pickling process plays a role in removing 'floating ash' on the surface of the workpiece, preferably, the pickling is cleaning by using a nitric acid solution, the nitric acid solution is prepared by using 60-70% of nitric acid and water by mass fraction, the addition amount of the nitric acid is 400-600ml/L, and the pickling time is 30-60 s. The temperature during acid washing is room temperature.

The ultrasonic cleaning can remove foreign matters in holes and gaps to the maximum extent, preferably, the ultrasonic cleaning has the ultrasonic power of 40kW, the frequency of 40kHz and the ultrasonic cleaning time of 5-10 min. The temperature of ultrasonic cleaning is room temperature. The ultrasonic cleaning can be matched with a cleaning agent to further optimize the cleaning effect, preferably, the cleaning agent is prepared from a neutral cleaning agent and water, and the mass fraction of the neutral cleaning agent is 1-5%.

The high-pressure water cleaning can effectively remove 'floating ash' generated on the surface of the workpiece in the transferring process and the storing process, and further reduce the residual level of foreign matters, preferably, the pressure of the high-pressure water cleaning is 30-50 MPa. The time is 5-10 min.

And (3) passivating to further remove foreign matters such as metal wires, paint, metal ash and the like on the surface of the part, preferably, the passivation is chromium-free passivation, and the treatment time is 5-10 min. The passivation treatment may also serve the following functions: the passive film generated by passivation can protect the surface of the part, and the matrix is protected from being oxidized no longer in the transfer process of the part. The passivation treatment can increase the binding force between the coating and the substrate in the subsequent coating process, and tests show that the binding force can be effectively improved by about 30-40 percent after the passivation treatment. And a chromium-free passivation process is adopted, so that the process is more environment-friendly.

Preferably, the coating is a varnish layer with the thickness of 20-80 μm. The water-based varnish layer is formed on the surface of the part and has the following characteristics: 1. compared with the traditional oily paint, the water-based paint is more environment-friendly and green, and accords with the current environment-friendly situation and the current green production concept; 2. after the water varnish is sprayed, the surface of the part is still transparent, the state characteristics of the substrate on the surface of the part can be observed, and the appearance of the product is not influenced. 3. The water varnish with the thickness range can bear the high-temperature and high-voltage working environment of the arc extinguish chamber, and the core function of the parts is not affected.

Further preferably, the preparation of the coating comprises spraying the aqueous varnish and then drying at 80-100 ℃. By adopting drying, the tension of the parts and the paint film can be effectively eliminated, the residual moisture on the surfaces of the parts is removed, and the binding force between the paint film and the substrate is increased.

Drawings

Fig. 1 is a process flow chart of a method for treating foreign matters on the surfaces of parts in an arc extinguishing chamber of a circuit breaker according to embodiment 1 of the present invention.

Detailed Description

The following examples are provided to further illustrate the practice of the invention.

In the following examples, the degreasing agent is purchased from Shanghai Qijie, and the type is KT-121; the aqueous epoxy varnish was purchased from Zhengzhou Tuoli Lacquer Co., Ltd. An industrial neutral detergent for ultrasonic cleaning was purchased from hang state rockway limited. The chromium-free passivation solution is purchased from high (China) of Degaohan and Han.

First, the specific embodiment of the invention relates to a method for treating foreign matters on the surface of parts in an arc extinguishing chamber of a circuit breaker

Example 1

The method for treating foreign matters on the surfaces of parts in an arc extinguishing chamber of a circuit breaker in the embodiment is shown in a process flow chart of fig. 1, and is described by taking a bent conductor as an example, and the method for treating foreign matters on the surfaces of parts in the arc extinguishing chamber of the circuit breaker comprises the following steps of:

1) performing shot blasting treatment on the part to be treated, wherein shot used in the shot blasting treatment is stainless steel, the particle size is 0.8mm, and the roughness after the shot blasting treatment is Ra6.3; and then washing the workpiece with water.

2) Placing the parts treated in the step 1) in a degreasing agent for degreasing treatment, wherein the workpiece is swung up and down for 2-3 times, the temperature of the degreasing treatment is 60 ℃, and the time is 4 min; and then washing the workpiece with water.

3) And (3) placing the parts treated in the step 2) into an acid liquor for acid cleaning, wherein the acid liquor is prepared from 67.5% by mass of nitric acid and water, and the content of the 67.5% nitric acid is 500 ml/L. Pickling is carried out at room temperature for 40 s; and then washing the workpiece with water.

4) And (3) placing the parts treated in the step 3) into an ultrasonic cleaning solution for ultrasonic cleaning, wherein the ultrasonic cleaning solution is prepared from a neutral cleaning agent and water, and the mass fraction of the neutral cleaning agent is 2%. Ultrasonic cleaning is carried out at room temperature for 8min, the power is 40kW, and the frequency is 40 kHz; and then washing the workpiece with water.

5) Placing the parts treated in the step 4) in a chromium-free passivation solution for passivation treatment, wherein the treatment temperature is room temperature and the treatment time is 8 min; and then washing the workpiece with water.

6) Cleaning the parts treated in the step 5) with high-pressure water, wherein the cleaning pressure is 40MPa, and the cleaning time is 8 min; and then drying the workpiece at the drying temperature of 60 ℃ for 15 min.

7) Spraying water-based epoxy varnish on the non-conductive connection part of the part treated in the step 6), and drying at 80 ℃ to obtain a paint film with the thickness of 50 microns.

Example 2

The method for treating foreign matters on the surfaces of parts in an arc extinguish chamber of a circuit breaker in the embodiment is characterized in that the parts are shielding parts, the materials are 1060-grade aluminum alloy, and the parts are manufactured by a spinning process, and the method is different from the method introduced in the embodiment 1 only in that:

in the step 1), the roughness after shot blasting treatment is Ra12.5.

In the step 2), the temperature of degreasing treatment is 70 ℃, and the time is 3 min.

In the step 3), the pickling time is 30 s.

In the step 4), the mass fraction of the neutral cleaning agent is 5%. The ultrasonic cleaning time is 5 min.

In the step 5), the time of the passivation treatment is 5 min.

In the step 6), the cleaning pressure is 30MPa, and the cleaning time is 5 min.

In step 7), the thickness of the varnish coating was 30 μm.

In other embodiments of the method for treating foreign matters on the surfaces of parts in the arc extinguishing chamber of the circuit breaker, the parts such as the electrical connection part, the end flange and the like can be treated by referring to the above embodiments, wherein the process parameters of the procedures such as degreasing, pickling, ultrasonic cleaning, passivation and the like can be adjusted according to the complexity of the workpiece, the foreign matters on the surfaces can be treated to an extremely low level, and the foreign matters can be prevented from scattering in the operation process of the circuit breaker to the greatest extent.

After the internal parts are sprayed with water paint, the bonding force is detected by a cross-cut method, and the level reaches 0.

After the parts are assembled into a product, product prototype tests including operation impact, lightning impact, power frequency withstand voltage, partial discharge tests and the like are carried out, and the national standard regulations can be met.