Determination principle of local standard technica

2022-07-24
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The main body of the electric pump industry in Fujian Province is an export-oriented enterprise. There are serious deficiencies in the current national standards and industrial standards in the relevant professional fields, especially in the electric pump, and there are problems such as insufficient series specifications, and the electric pump safety has not been effectively integrated with the international standards, which are far from meeting the needs of the development of the electric pump industry in Fujian Province. In accordance with the development strategy of "winning by quality, building brand and developing in scale", Fujian electric machinery industry technology development base starts with standardization work and takes improving product quality as the starting point. Fujian pump product quality supervision and inspection station is responsible for organizing and guiding Fujian Yuandong Electric Machinery Group Co., Ltd. and other L6 electric pump manufacturing enterprises in Fujian electric machinery industry cluster to develop enterprise standards for electric pump products, It has filed 8 series including jet self priming electric pump and 48 electric pump food industry standards, and cooperated with the general licensing office and the Provincial Bureau of quality and technical supervision to carry out the production license of pump products in our province. On the basis of organizing and guiding the formulation of food industry standards, and in accordance with the requirements of Fujian Provincial Bureau of quality and technical supervision (mzjb [2009] No. 269 "the plan for the preparation and revision of Fujian provincial local office standards in 2009 (the first batch) on the 5.5 formula for calculating the acceleration power spectral density slope (db/oct)), the bureau undertook the formulation of five Fujian provincial local office standards for electric pumps, including the single-stage single suction centrifugal electric pump, These five standards basically cover the main electric pump products produced and operated by the cluster food industry. Motorcycle helmets can better regulate the production and operation behavior of industrial enterprises, provide technical basis for product production, testing, identification and promotion, and provide strong legal protection for export-oriented enterprises to effectively resist the technical barriers to trade in International trade

1 standard classification and naming rules

Fujian electric machinery industry technology development base organized technical experts from relevant scientific research, testing, industry associations and other units in Fujian Province to conduct a comprehensive technical investigation on the electric pump industry in Fujian Province. Based on the principle of standardization and unification of Fujian electric pump product name, model and specification, on the basis of investigation, with reference to the corresponding national industry standards, The classification and naming rules of local standards for electric pumps in Fujian Province are shown in Table 1

2 content of standard formulation Guangya aluminum plans to spend three years

according to the provisions of the standard (literature [1]), on the basis of referring to the national standards and industrial standards of electric pump phase fire (literature [2] ~ [1 7]), in combination with the actual production situation of the electric pump production and food industry in the motor industry cluster of Fujian Province, and taking into account the integration with the international and domestic markets, the single-stage single suction centrifugal electric pump, jet self-priming electric pump, vortex micro electric pump Types, models, basic parameters, technical requirements, test methods, inspection rules, marks, packaging, transportation and storage of vortex self-priming electric pumps and small multi-stage centrifugal electric pumps

3 determination principle of technical indicators

in accordance with the standard making principles of advanced technology, economic rationality and feasibility, on the basis of summarizing the real data of the products provided by the electric pump production and food industry, according to the guiding principles of the national and industrial standards on the indicators such as power factor, safety performance, performance tolerance, suction, necessary NPSH and efficiency, in accordance with the rules for the formulation of the electric pump series type spectrum, and in combination with the inspection results of a large number of prototypes, Determine the type spectrum specifications and technical indexes of the electric pump series, and determine the test and assessment methods of each performance index

3.1 power factor

the electric pump shall be used to assess the performance of the whole machine. The electric pump motor is only a part of the electric pump, and its performance shall meet the requirements of the overall performance of the electric pump. It shall not be removed for separate assessment; Power factor is an important parameter to be considered in the matching design of electric pump motor. Since it has been reflected in the overall efficiency of electric pump and motor temperature rise and other indicators, there is no need to conduct separate assessment. The standard does not specify power factor indicators

3.2 safety performance

during the formulation of the standard, in order to be in line with the international and domestic markets, the provisions on the safety performance of the electric pump directly refer to clauses 10, 11, 13, 15, 16, 19, 22, 27 in the standard (document [4]) and the standard (document [5]), to assess the load capacity, normal temperature rise, leakage current, electrical strength, humidity, abnormal (locked rotor), abnormal (7h dry grinding), static pressure, grounding and other safety items of the electric pump, Keep basically consistent with the safety certification inspection of electric pump outlet

3.3 performance tolerance

for the electric pump with input power less than 10 kW, its friction loss and volume loss become relatively important and difficult to predict. Refer to Appendix B of the standard (literature [8]) and make reasonable extension. The tolerances for flow, head and electric pump efficiency are shown in Table 2

3.4 suction head and necessary NPSH

for the products of vortex micro electric pump, vortex self-priming pump and jet self-priming pump, NPSH is not intuitive, and the suction head is more direct for users. These three standards do not specify the necessary NPSH index, but stipulate the suction head index and assessment method on the basis of a large number of prototype test data

for single-stage single suction centrifugal electric pump and small multi-stage centrifugal electric pump, according to the flow and input power specified by the electric pump, on the basis of a large number of prototype tests, the necessary NPSH is specified by referring to standard JB/T 541 and standard (literature [9]), as shown in Table 3

3.5 efficiency

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the efficiency of jet self-priming pump, vortex micro electric pump, vortex self-priming pump and small multi-stage centrifugal electric pump is specified on the basis of referring to the relevant national standards and industrial standards of electric pump, combined with the standard verification reports of a large number of prototypes, and in accordance with the standard preparation principles of advanced technology, economic rationality and feasibility; When the flow, head and other basic parameters of the electric pump do not comply with the provisions of the standard basic parameter table, the electric pump efficiency shall not be lower than the difference value of the electric pump efficiency under the adjacent flow of the standard basic parameter table

the efficiency index of single-stage single suction centrifugal electric pump is specified as follows:

the composition of pump efficiency and motor efficiency, with due consideration to the deviation of the matching between the pump and the motor at the best operating point, it is specified that the electric pump efficiency is calculated according to formula (1):

4 conclusion

db35/T l013.2010 whirlpool micro electric pump and other five local standards for electric pumps in Fujian Province were approved and issued on June 7, 2010 and implemented on July 8, 2010. The determination of the five standard technical indicators is scientific and reasonable, conforms to the standard making principles of advanced technology, economic rationality and feasibility, and reaches the leading level in China. It can be used as the technical basis for the production, sales, promotion and legal supervision of corresponding electric pump products in Fujian Province. Its implementation is conducive to standardizing and guiding the production and operation of electric pump products in Fujian Province, and promoting the development of electric pump industry and the improvement of product quality in Fujian Province

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