- •Vacuum technology development
- •1. Words to be remembered.
- •2. Translate the sentences. Pay attention to the words in italics.
- •5. Decide whether the following statements are true or false according to text a.
- •6. Answer the following questions to text a.
- •7. Read text b carefully paying attention to the words in bold type.
- •8. Decide whether the following statements are true or false according to text b.
- •9. Answer the questions to text b.
- •10. Match the words with the synonyms.
- •14. Match the parts of the sentences.
- •16. Grammar Tutorials: Word Order, Miscellaneous
- •17. Translate the following sentences. Notice the difference in the underlined words.
- •19. Translate the text from Russian into English. Use the list of words below for help.
- •Unit II. Theory of pvd Coatings
- •1. Words to be remembered.
- •1. Words to be remembered.
- •2. Translate the sentences. Pay attention to the words in italics.
- •3. Read text a carefully paying attention to the words in bold type.
- •4. Decide whether the following statements are true or false according to text a.
- •5. Answer the following questions to text a.
- •6. Read text b carefully paying attention to the words in bold type.
- •7. Decide whether the following statements are true or false according to text b.
- •8. Answer the questions to text b.
- •10. Make sure you know the meanings of these words. Match the words with their definitions.
- •11. Match the words with the synonyms (text a).
- •12. Match the same words with the antonyms (text a).
- •13. Translate the text on theory and practical use of pvd coatings, study the structure of TiAln. Make its technical and non-technical description.
- •14. Scan the text about Copper (Cu) carefully. Use the scattered Nouns – Verbs – Adjectives – Adverbial Modifiers to make as many correct sentences-statements as possible.
- •17. See the difference in the following words. Use a dictionary. Read all of them aloud. Make some sentences of your own. Some eight examples are given for you.
- •20. Learn the poem “The Planets” by heart. Say, if gold, silver and lead are used in vacuum technologies. What does present-day science say about the content of metals in the planets? The Planets
- •21. Practice makes perfect. Translate the text on Vacuum history in a written form.
- •24. Scan the biography of Michael Faraday. Put questions to the answers given below.
- •25. Look through the texts a-b again and make notes under the following headings. Then use your notes to talk about it.
- •History
- •II. Home Appliances II: Vacuum-Cleaner
- •20. Scan the biography. Put questions to the given answers.
- •Reading, Vocabulary & Creative Practice
- •1. Words to be remembered.
- •2. Translate the sentences. Pay attention to the words in italics.
- •3. Read text a. Pay attention to the words in bold type.
- •4. Decide whether the following statements are true or false according to text a.
- •5. Answer the questions to text a.
- •6. Read text b. Pay attention to the words in bold type.
- •7. Decide whether the following statements are true or false according to text b.
- •8. Answer the questions to text b.
- •13. Special Quiz. Think of the better way to remember the most of the vocabulary and the vacuum pump classification. Share your opinion on it with your partner.
- •Russian English
- •II. Классификация вакуумных насосов по принципу действия
- •15. A) Open the brackets giving the right forms of the words; b) Translate the text “Cryopump” in a written form; c) Compare texts 15.1 and 15.2.
- •16. Grammar Tutorials: Question Technique Read and give a title to the text. Put questions to the given answers.
- •18. Translate from Russian into English. Use the proper grammar rules and the prompting words in brackets.
- •19. Read the text “Pump Accessories”. Pay attention to the abbreviations, and Stone Wall Constructions. Summarize the text.
- •20. Translate the following abbreviations and Stone Wall Constructions.
- •21. Read about some pumps’ features and benefits. Pay attention to the suffixes in the words, describing the pumps. Using the descriptive words, try to persuade the customers to buy the pumps.
- •23. Make notes under the following headings. Then use your notes to talk about it.
- •Unit VI. Pumps and Compressors
- •“First, be sure a thing is wanted or needed, then go ahead.” Thomas Edison.
- •1. Words to be remembered.
- •2. Translate the sentences. Pay attention to the words in italics.
- •3. Read the text a. Pay attention to the words in bold type.
- •4. Decide whether the following statements are true or false according to text a.
- •5. Answer the questions to text a.
- •6. Read text b. Pay attention to the words in bold type.
- •7. Decide whether the following statements are true or false according to text b.
- •8. Answer the questions to text b.
- •10. Match the words with the synonyms.
- •11. Match the words with the antonyms.
- •12. Fill in the correct prepositions.
- •13. Open the brackets. Give the right forms of the words in bold. Translate the text in a written form.
- •14. Special Quiz. Read about the uses of compressors. Match the parts of the sentences making the sentences complete. Start from: Gas compressors are used … … .
- •17. Study the key words to the crossword from Unit III.
- •18. Engineer tested. Do you believe …
- •19. Study the compressor refrigerator schematic, operation and construction. Discuss the information in dialogues. How do you see the compressor refrigerator in the future?
- •Construction
- •20. Scan the biography both I) in English and II) in Russian. Make a close look at English and Russian versions. Find and write down the differences.
- •Follow-up Activity
- •21. Make notes under the following headings. Then use your notes to talk about it.
- •1. Kinetic Devices (General View).
- •Unit VII. Vacuum Engineering and Its Prospects
- •1. Words to be remembered.
- •2. Translate the sentences. Pay attention to the words in italics.
- •3. Read text a. Pay attention to the words in bold type.
- •4. Decide whether the following statements are true or false according to text a.
- •5. Answer the questions to text a.
- •6. Read text b. Pay attention to the words in bold type.
- •7. Decide whether the following statements are true or false according to text b.
- •8. Answer the questions to text b.
- •9. Make sure you know the meanings of these words. Match the words with their definitions. Consult the dictionaries.
- •10. Match the words with the synonyms.
- •11. Match the same words with the antonyms.
- •12. Fill in the correct prepositions.
- •13. Scan the text. Make its summary in Russian then give English translation of the summary.
- •14. 1) Scan the biography of Sir William Crookes. Pay attention to the underlined words and notions. Say or write what you know about them.
- •14. 2) Scan the biography of John Dalton. Put questions to the given answers.
- •15. Scan the article “Vacuum Technology Developed to Control Insects in Wood.” Divide the text into logical parts.
- •17. Read the advertisement. Make everybody trust the method described.
- •19. Read the article “Japanese Camera Used to Test Innovation.” Make up some 3–5 statements of your own which might be a summary to the article.
- •20. Study the suggested key answers to the previous tasks.
- •21. Make notes under the following headings. Then use your notes to talk about it.
- •Permissible pressure units including the torr 1) and its conversion
- •Vocabulary Terms And Abbreviations Used In Vacuum Engineering
- •Casing n оболочка, обшивка; отливка, литье
- •Confine V удерживать
- •Deliberate adj умышленный, обдуманный
- •Develop V развивать, строить, подготавливать, совершенствовать
- •Drastic adj глубокий, интенсивный, резкий
- •Drift n наклонный ствол, отклонение
- •Neutral n нейтральный
- •Vacuum technology development
- •220013, Минск, проспект Независимости, 65.
23. Make notes under the following headings. Then use your notes to talk about it.
1. Vacuum Pump History.
2. Vacuum Pump Classification.
3. Vacuum Pump Applications.
4. Vacuum Pump Accessories.
5. Vacuum Pump Repair.
6. Some Vacuum Pumps’ Benefits and Features.
Unit VI. Pumps and Compressors
Before you start: Think it over. Agree-Disagree
“First, be sure a thing is wanted or needed, then go ahead.” Thomas Edison.
“Wonders are many, and nothing is more wonderful than man.” Sophocles. Note: Sophocles, 495–406, Greek Dramatist
Reading, Vocabulary & Creative Practice
1. Words to be remembered.
axial-flow compressor mesh shaft
axis crankshaft radial similar to
attainable diaphragm reciprocating stage
blade diffuser reduce stationary
casing handle remediation turbine
contaminate housing rim vane
centrifugal impeller rotary screw via
combustion inlet part scroll wobble-plate
2. Translate the sentences. Pay attention to the words in italics.
1. The Earth rotates about an axis between the North Pole and the South Pole.
2. In vacuum service, the attainable pressure reduction is limited.
3. A propeller, an oar, a compressor have blades.
4. The contaminated ground water is drawn from wells by vacuum.
5. Centrifugal force is opposite centripetal.
6. Compressor is a part of a machine for compressing gas or air.
7. A force of collision impels an object along its path.
8. The teeth on these two wheels mesh as the teeth revolve.
9. This mechanical device increases the pressure of a gas by reducing its volume.
10. Compressors are similar to pumps.
11. My opinion is similar to yours.
12. A stationary target is easier to aim.
13. There is a big difference between the words “stationary” and “stationery”.
14. Vane is a bladelike part of certain machines, which has a flat surface.
15. I sent a present to my friend via her sister.
16. Wobble-plate compressor means “компрессор с качающей шайбой”.
3. Read the text a. Pay attention to the words in bold type.
A. Kinetic Devices
A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. Compression of a gas naturally increases its temperature. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas. Liquids are relatively incompressible, so the main action of a pump is to move the liquid elsewhere.
The term pump is generally used for liquid-handling or hand-operated devices while the term compressor is used when the pressure of a gas is increased in a motor-driven machine. A gas pump is generally called a compressor.
Kinetic devices include centrifugal pumps and compressors and axial-flow devices. In centrifugal pumps and compressors, the vanes of the impeller, or rotor take fluid in near the axis. Centrifugal pumps and compressors can handle at moderate flow rates and pressure increases.
Axial-flow compressors consist of a number of stages, each with a set of stationary and rotating blade passages.
Liquid ring pumps are known to be rotating positive displacement pumps. They are typically used as vacuum pumps but can also be used as gas compressors. The function of a liquid ring pump is similar to a rotary vane pump. They are an inherently low friction design, with the rotor being the only moving part.
The liquid ring pump compresses gases by means of an impeller rotating within and eccentric to a cylindrical casing. Liquid (usually water) is fed into the pump and by centrifugal action, forms a moving cylindrical ring against the inside of the casing. This liquid ring creates a series of seals in the space between the impeller vanes to form compression chambers. The eccentricity between the impeller rotating axis and the casing geometric axis results in a cyclic variation of the volume enclosed by the vanes and the ring.
Gas (or air) drawn into the pump via an inlet port in the end of the casing, is trapped in the space formed by the impeller vanes and the liquid ring. Liquid ring systems can be single or multi-stage. Typically a multi-stage pump will have up to two compression stages on a common shaft. In vacuum service, the attainable pressure reduction is limited by the vapor pressure of the ring-liquid. Single stage vacuum pumps typically produce vacuum to 35 torr (mm Hg), assuming air is being pumped and the ring-liquid is water at 15ºC (60F) or less.
These simple, but highly reliable pumps have a variety of industrial applications. For example, soil remediation, where contaminated ground water is drawn from wells by vacuum. In petroleum refining, vacuum distillation also makes use of liquid ring vacuum pumps to provide the process vacuum. Liquid ring compressors are often used in Vapor recovery systems.
Comprehension Check – 1