- •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.
4. Decide whether the following statements are true or false according to text a.
1. Otto von Guericke was the first to demonstrate the properties of vacuum in a practical way.
2. The scientist used eight dogs to separate the hemispheres.
3. The vacuum pump was originally invented to help teachers to study the properties of gases.
4. The history of progress in the study of vacuum is the history of vacuum pump design.
5. Before 1900, vacuum pumps were not produced.
6. In the 20th century the rotary oil pump, the molecular pumps were developed.
7. The pumps developed in the 20th century made a high vacuum possible.
8. With modern techniques all but one of every million molecules can be removed.
9. Efficient pumps can reduce the pressure of the gas to between 100 and 0.1 pascal.
10. The air of our atmosphere exerts low pressure to enter an enclosed space.
11. A pump is a toy.
12. Perhaps the best-known pump is the oil diffusion pump.
5. Answer the questions to text a.
1. What is vacuum pump?
2. Did a German or British scientist demonstrate the properties of vacuum in a practical way?
3. What does stand for the “Magdeburg Experiment”?
4. What was the advantage of the first vacuum pumps?
5. Did scientists pay attention to the design of pumps?
6. How are the pumps developed in the 20th century called?
7. What made high vacuum possible?
8. Does a perfect vacuum exist?
9. Can the human heart be compared with a pump?
10. What does a vacuum pump do?
11. How many force pumps can you name?
12. Is the vacuum pump a necessity in the 21st century?
6. Read text b. Pay attention to the words in bold type.
B. Types, Categories and Techniques
Pumps can be broadly categorized into three techniques:
Positive displacement pumps use a mechanism to repeatedly expand a cavity, allow gases to flow in from the chamber, seal off the cavity, and exhaust it to the atmosphere.
Momentum transfer pumps, also called molecular pumps, use high-speed jets of dense fluid or high speed rotating blades to knock gaseous molecules out of the chamber.
Entrapment pumps capture gases in a solid or absorbed state. This includes cryopumps, getters, and ion pumps.
Positive displacement pumps are the most effective for low vacuums, and their high back-stream flows through mechanical seals generally limit their usefulness in high vacuums. Momentum transfer pumps in series with positive displacement pumps are the most common configuration used to achieve high vacuums, but they stall at low vacuums. Entrapment pumps can be added to reach ultrahigh vacuums, but they have a maximum operational time since they do not exhaust materials. They periodically saturate and require regeneration, which usually means bringing the system back up to higher pressures and temperatures. The available operational time is usually unacceptably short in low and high vacuums, thus limiting their use to ultrahigh vacuums. Pumps also differ in details like manufacturing tolerances, sealing material, pressure, flow, admission or no admission of oil vapor, service intervals, reliability, tolerance to dust, tolerance to chemicals, tolerance to liquids and vibration.
In a momentum transfer pump, gas molecules are accelerated from the vacuum side to the exhaust side. Momentum transfer pumping is only possible below pressures of about 1 kPa. Matter flows differently at different pressures based on the laws of fluid dynamics. At atmospheric pressure and mild vacuums, molecules interact with each other and push on their neighboring molecules in what is known as viscous flow. When the distance between the molecules increases, the molecules interact with the walls of the chamber more often than the other molecules, and molecular pumping becomes more effective than positive displacement pumping. This regime is generally called high vacuum.
Molecular pumps sweep out a larger area than mechanical pumps, and do so more frequently, making them capable of much higher pumping speeds. They do this at the expense of the seal between the vacuum and their exhaust. The two main types of molecular pumps are the diffusion pump and the turbo-molecular pump. Turbo-molecular pumping systems are the most reliable and cost-effective means producing high vacuum. Besides, they are portable. Both types of pumps blow out gas molecules that diffuse into the pump. Diffusion pumps blow out molecules with jets of oil, while turbo-molecular pumps use high-speed fans. Both of these pumps will stall and fail to pump if exhausted directly to atmospheric pressure, so they must be exhausted to a lower grade vacuum created by a mechanical pump.