UNS0863A-P,V1 HIEE305082R0001 ABB Digital I/O Card

Description

ABB UNS0863A-P,V1 HIEE305082R0001 Digital I/O Card

The harm of cavitation in liquid oxygen pump.

The effect of cavitation on liquid oxygen pump varies with its degree. When the degree of cavitation is not serious, the effect is not significant. If the cavitation reaches a certain degree, a lot of bubbles are produced at the inlet of the working wheel blade, and these bubbles condense into liquid as the liquid enters the place where the pressure is high (the outlet of the working wheel), and the bubbles burst rapidly. Because the density difference of gas liquid is hundreds of times, when the liquid oxygen condenses, the volume suddenly shrinks, and the liquid around rushes to the bubble position at a high speed, so that the impeller surface in contact with the bubble is violently impacted. It not only makes the pump flow, head and efficiency of the sudden decline, the continuity of the liquid flow is destroyed, and the pump impeller, regulating wheel and pump shell surface depression and micro cracks; Chemical corrosion can also occur where gas strikes. Therefore, it is necessary to avoid cavitation of liquid oxygen pump.

Considerations to avoid cavitation

In order to avoid the occurrence of discrimination, liquid oxygen is often made to have 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 is increased, so that the liquid oxygen has a certain degree of supercooling. Generally, the installation position of the liquid oxygen pump is lowered to improve the inlet pressure of the liquid oxygen pump (even if there is a certain static pressure head at the inlet of the liquid oxygen), and at the same time, the undercooling degree is improved (the design considers the undercooling degree of 6℃~10℃). For example, when the pressure of liquid oxygen in the main condensate 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 liquid column, its saturation temperature is 97K, which is equivalent to the supercooling degree of 3℃ obtained by liquid oxygen. In addition, attention should also be paid to the operation: the liquid oxygen adsorber should be thoroughly pre-cooled before being used until the liquid is released; Don't be too hasty in closing its bypass valve and so on. Once cavitation occurs, it should be immediately vented to ensure the safe operation of the liquid oxygen pump. In order to improve the anti-cavitation ability of the liquid oxygen pump, the structure is currently used in the working wheel in front of the placement of spiral or axial flow induction wheel method "outside to the middleman, to the heat insulation wall". This is Zhang Ruimin's brief summary of organizational restructuring, insulation wall is middle managers. It quotes Charles Handy, the management guru, as saying, "The middle tier in the business is a bunch of cooked geese. They don't have the nerve to reflect the market. Haier planned to cut about 26,000 jobs last year and this year.

For many years, household appliances belong to large-scale manufacturing and labor-intensive industries. Many household appliances production still rely on manual assembly, which not only requires a large number of first-line industrial workers, but also needs to be equipped with production management personnel for management. According to Xu Feng, in the traditional production link, the ratio of workers and management post is 1:10, that is, 10 workers are equipped with one management post, if the front-line team leader is included, the ratio can reach 1:5. Previously, in industries with high levels of automation, such as automobiles and fast-moving consumer goods, one worker might manage a single line, and the number of managers was drastically reduced, with a ratio of 1:20 managerial posts being a common staffing level.

Now the household appliance industry is facing the transformation and upgrading demand, not only Haier, including 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 the employees, this year's job may be "optimized" tomorrow, this is not only the front-line industry workers face the reality, including the management. According to Xu Feng, in the production and manufacturing link, generally speaking, the first to be squeezed out are ordinary industrial workers, followed by ordinary technical workers, senior technical workers, technical personnel managers.

General Information

• Product ID:HIEE305082R0001
• Catalog Description:UNS 0863A-P,V1:Digital I/O card

Additional Information

• Country of Origin:Switzerland (CH)
  
• Customs Tariff Number:85371092
  
• Frame Size:Undefined
  
• Gross Weight:0 kg
  
• Invoice Description:UNS 0863A-P,V1:Digital I/O card
  
• Made To Order:No
  
• Minimum Order Quantity:1 piece
  
• Order Multiple:1 piece
  
• Package Level 1 Gross Weight:0 kg
  
• Package Level 1 Units:1 piece
  
• Part Type:New
• Product Net Depth / Length:480 mm
  
• Product Net Height:82 mm
  
• Product Net Weight:0.66 kg
  
• Product Net Width:180 mm
  
• Product Type:Undefined
  
• Quote Only:No
  
• Selling Unit of Measure:piece
  
• Stocked At (Warehouses):Baden, Switzerland
• Two Speed Motor:No
  
• WEEE Category:Product Not in WEEE Scope

One year warranty, special discount after sale

The company focuses on DCS, PLC, robot, large servo four systems

The main products are all kinds of module/card, controller, touch screen, servo drive

The company's advantages: the supply of imported original products, professional production of accessories

Fast delivery time, complete supply, The seller has more than $1526000 worth of industrial control products inventory

We Can transport to the world！！！

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