DSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NFDSDO11557160001-NF

High voltage inverter will develop towards the direction of high power, miniaturization and light-weight.

② High voltage frequency converter will develop towards direct device high voltage and multiple superposition (device in series and unit in series).

③ New power semiconductor devices with higher voltage and current will be used in high-voltage inverters.

④ At this stage, IGBT, IGCT and SGCT will still play a major role, and SCR and GTO will withdraw from the inverter market.

⑤ The application of speed sensorless vector control, magnetic flux control and direct torque control will be mature.

⑥ Fully realize digitalization and automation: parameter self setting technology; Process self optimization technology; Fault self diagnosis technology.

⑦ Using 32-bit MCU, DSP, ASIC and other devices, the converter can achieve high-precision and multi-function.

⑧ The relevant supporting industries are developing towards a larger scale, and the social division of labor will be more obvious. With the further development of technical research, the domestic high-voltage inverter can already compare with the imported inverter in theory and function, but due to the limitations of process technology, the gap between the domestic high-voltage inverter and the imported product is still obvious. These conditions are mainly reflected in the following aspects:

① The major foreign products are stepping up to occupy the domestic market and speeding up the pace of localization.

② The R&D capability and industrialization scale are increasing year by year.

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4 Considerations for avoiding cavitation

In order to avoid discrimination, liquid oxygen often has a degree of supercooling when entering the pump, so as to reduce the possibility of liquid vaporization in the pump. If the inlet pressure of the liquid oxygen pump is increased, the saturation temperature of the liquid oxygen will be increased and the liquid oxygen will have a certain degree of supercooling. Generally, the installation position of the liquid oxygen pump is lowered to increase the inlet pressure of the liquid oxygen pump (even if there is a certain static head at the inlet of the liquid oxygen), and the degree of supercooling is improved (the degree of supercooling is considered to be 6 ℃~10 ℃ in the design). For example, when the pressure of liquid oxygen in the main condenser evaporator is 0.04MPa, its saturation temperature is 94K. When the inlet pressure of liquid oxygen pump increases to 0.09MPa due to the static pressure of the liquid column, its saturation temperature is 97K, which is equivalent to that liquid oxygen has obtained a supercooling of 3 ℃. In addition, attention shall be paid during operation: the liquid oxygen adsorber shall be thoroughly precooled before startup until the liquid is discharged; Do not rush to close the bypass valve. Once cavitation occurs, exhaust immediately to ensure safe operation of the liquid oxygen pump. In order to improve the anti cavitation ability of liquid oxygen pump, the method of installing spiral or axial flow inducer in front of the working wheel is currently adopted in the structure to "remove the middleman outside and remove the thermal insulation wall inside". This is Zhang Ruimin's brief summary of organizational structure adjustment. The thermal insulation wall is the middle manager. Citing the words of Charles Handy, a management master, he said, "The middle layer of an enterprise is a group of roasted geese. They have no nerves and will not reflect the market situation. According to Haier's plan, Haier cut about 26000 jobs last year and this year.

For many years, household appliances belong to large-scale manufacturing and labor-intensive industries. Many household appliances are produced by manual assembly, which requires not only a large number of front-line industrial workers, but also production management personnel for management. According to Xu Feng, in the traditional production link, the ratio of workers and management posts is 1:10, that is, 10 workers are equipped with a management post. If the team leaders of the front line are included, the ratio can reach 1:5. Previously, in industries with high degree of automation, such as automobiles and FMCG, one worker may manage one line, and the number of management personnel is also greatly reduced. The ratio of 1:20 management posts is a common level of allocation.

Today, the transformation and upgrading needs facing the household appliance industry are not only Haier, but also Gree, Hisense and other household appliance enterprises have invested a lot of money in automation transformation. For enterprises, this may be the optimization result of reducing costs and improving efficiency. But for employees, this year's jobs may be "optimized" tomorrow, which is not only a reality faced by front-line industrial workers, but also the management. According to Xu Feng, in the production and manufacturing process, generally speaking, ordinary industrial workers are the first to be eliminated, followed by ordinary technical workers, senior technical workers and technical personnel managers.