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Консультация № 175964
10.01.2010, 02:46
0.00 руб.
13.06.2013, 15:56
0
1
1
Здравствуйте, уважаемые эксперты! Прошу помощи в решении задачи! Поршневой насос простого действия с диаметром цилиндра D= 80 мм, ходом поршня S= 340 мм, числом двойных ходов в минуту n= 95ход/мин и объемным КПД = 0,9 подает рабочую жидкость в систему гидропривода. При какой частоте вращения должен работать включенный параллельно шестеренный насос с начальным диаметром шестерен dн= 64 мм, шириной шестерен b= 85мм, числом зубьев z= 30 и объемным КПД = 0,86, чтобы количество подаваемой жидкости удвоилось?
Обсуждение
13.01.2010, 12:03
общий
это ответ
Здравствуйте, alecsei.
Подача поршневого насоса определяется по формуле
Q1 = πD2/4 • S • n • η1,
где η1 – объемный КПД поршневого насоса.
Подача шестеренного насоса определяется по формуле
Q2 = kdн2/z • b • N • η2,
где k – коэффициент, учитывающий форму зубьев насоса (для некорригированных зубьев k = 7), N – частота вращения ведущего вала насоса, η2 – объемный КПД шестеренного насоса.
При параллельном подключении двух насосов их подачи складываются. Поэтому для удвоения количества подаваемой жидкости необходимо, чтобы выполнялось условие Q1 = Q2, откуда находим
πD2/4 • S • n • η1 = kdн2/z • b • η2,
N = (πD2/4 • S • n • η1)/(kdн2/z • b • η2) = (π • (80)2/4 • 340 • 95 • 0,9)/(7 • (64)2/30 • 85 • 0,86) ≈ 2,1 • 103 (об/мин).
Ответ: 2,1 • 103 об/мин.
С уважением.
Подача поршневого насоса определяется по формуле
Q1 = πD2/4 • S • n • η1,
где η1 – объемный КПД поршневого насоса.
Подача шестеренного насоса определяется по формуле
Q2 = kdн2/z • b • N • η2,
где k – коэффициент, учитывающий форму зубьев насоса (для некорригированных зубьев k = 7), N – частота вращения ведущего вала насоса, η2 – объемный КПД шестеренного насоса.
При параллельном подключении двух насосов их подачи складываются. Поэтому для удвоения количества подаваемой жидкости необходимо, чтобы выполнялось условие Q1 = Q2, откуда находим
πD2/4 • S • n • η1 = kdн2/z • b • η2,
N = (πD2/4 • S • n • η1)/(kdн2/z • b • η2) = (π • (80)2/4 • 340 • 95 • 0,9)/(7 • (64)2/30 • 85 • 0,86) ≈ 2,1 • 103 (об/мин).
Ответ: 2,1 • 103 об/мин.
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
Форма ответа
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