- •Введение
- •I. Write down the words and word combinations below into your exercise-book. Memorize them.
- •Explain what the following international words from Text 1 mean:
- •Read Text 1 and answer the following questions:
- •Find in the text the sentences with Passive Voice and translate them: text 1
- •V. Give a short summary of Text 1 unit 2
- •I. Write down the words and word combinations below into your exercise book. Memorize them.
- •II. Explain what the following international words from text 2 mean:
- •Read Text 1 and answer the following questions:
- •IV. Give a short summary of Text 2
- •I. Translate the text using a dictionary (in written form)
- •I. Write down the words and word combinations below into your exercise book.
- •II. Explain what the following international words from text 4 mean:
- •III Read and translate Text 4 with a dictionary:
- •IV. Answer the following questions to the text:
- •Give a short summary of Text 4
- •1.Write down the words and word combinations below into your exercise book.
- •II. Pronounce the following words: (Прочтите следующие слова)
- •Read and translate Text 5 with a dictionary:
- •IV. Answer the following questions to the text:
- •IV. Give a short summary of Text 5
- •I. Write down the words and word combinations below into your exercise book.
- •II. Read and translate the following words and word combinations:
- •III. Read and translate Text6 with a dictionary:
- •IV. Answer the following questions to the text:
- •Give a short summary of Text 6
- •1.Translate the text with a dictionary in written form
- •I. Write down the words and word combinations below into your exercise book.
- •II. Read and translate Text 8 with a dictionary
- •III. Answer the following questions to the text:
- •IV. Give a short summary of Text 8
- •I. Write down the words and word combinations below into your exercise book.
- •II. Read and translate Text 9 with a dictionary:
- •Vane pump
- •III. Answer the following questions to the text:
- •Give a short summary of Text 9
- •1. Write down the words and word combinations below into your exercise book.
- •II. Read and translate text 10 with a dictionary:
- •1. Write down the words and word combinations below into your exercise book.
- •2. Give a short summary of Text 12 without a dictionary
- •Содержание
IV. Answer the following questions to the text:
How are rotary pumps designed?
How can rotary pumps be classified?
What can you say about gear pumps?
Give a short summary of Text 4
UNIT 5
1.Write down the words and word combinations below into your exercise book.
1. spur gear pump шестеренный насос
2. mesh зубчатое зацепление
3. housing корпус
4. drive gear ведущее зубчатое колесо
5. drive shaft приводной вал
6. attach соединять, закреплять
7. counterclockwise против часовой стрелки
8. clockwise движущийся по часовой стрелке
9. shearpin
10. jamming of parts заклинивание, заедание .
11. herringbone gear pump ротативный насос с шевронными
шестернями
12. overlap наложение, совмещение
II. Pronounce the following words: (Прочтите следующие слова)
Spur gear pump, counterclockwise, shearpin, herringbone gear pump, clearance, drive shaft, excessive load, overlapping, pulsation
Read and translate Text 5 with a dictionary:
TEXT 5
SPUR GEAR PUMPS
The spur gear pump consists of two meshed gears which revolve in a housing. The drive gear in the illustration is turned by a drive shaft which is attached to the power source. The clearances between the gear teeth as they mesh and between the teeth and the pump housing are very small. The inlet port is connected to the fluid supply line, and the outlet port is connected to the pressure line, the drive gear is turning in a counterclockwise direction, and the driven (idle) gear is turning in a clockwise direction. As the teeth pass the inlet port, liquid is trapped between the teeth and the housing. This liquid is carried around the housing to the outlet port. As the teeth mesh again, the liquid between the teeth is pushed into the outlet port. This action produces a positive flow of liquid into the system. A shearpin or shear section is incorporated in the drive shaft. This is to protect the power source or reduction gears if the pump falls because of excessive load or jamming of parts.
HERRINGBONE GEAR PUMP
The herringbone gear pump is a modification of the spur gear pump. The liquid is pumped in the same manner as in the spur gear pump. However, in the herringbone pump, each set of teeth begins its fluid discharge phase before the previous set of teeth has completed its discharge phase. This overlapping and the relatively larger space at the center of the gears tend to minimize pulsations and give a steadier flow than the spur gear pump.