{"id":1505,"date":"2025-06-27T15:25:58","date_gmt":"2025-06-27T07:25:58","guid":{"rendered":"https:\/\/www.tflequip.com\/?p=1505"},"modified":"2025-06-27T15:25:59","modified_gmt":"2025-06-27T07:25:59","slug":"should-the-outlet-valve-be-closed-when-starting-a-centrifugal-pump","status":"publish","type":"post","link":"https:\/\/www.tflequip.com\/cs\/should-the-outlet-valve-be-closed-when-starting-a-centrifugal-pump\/","title":{"rendered":"M\u011bl by b\u00fdt v\u00fdstupn\u00ed ventil p\u0159i spou\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho \u010derpadla uzav\u0159en?"},"content":{"rendered":"

P\u0159i spou\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho \u010derpadla je t\u0159eba v\u011bnovat pozornost mnoha v\u011bcem. M\u011bli byste p\u0159i spou\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho \u010derpadla uzav\u0159\u00edt v\u00fdpustn\u00fd ventil?<\/p>\n

Odpov\u011b\u010f zn\u00ed, \u017ee ji mus\u00edte zav\u0159\u00edt!<\/p>\n

1: Pro\u010d by m\u011bl b\u00fdt p\u0159i spou\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho \u010derpadla uzav\u0159en v\u00fdtla\u010dn\u00fd ventil?<\/p>\n

\"20250627145014\"<\/p>\n

P\u0159i spu\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho vodn\u00edho \u010derpadla nen\u00ed ve v\u00fdstupn\u00edm potrub\u00ed \u010derpadla \u017e\u00e1dn\u00e1 voda, tak\u017ee nevznik\u00e1 \u017e\u00e1dn\u00fd odpor v potrub\u00ed a v\u00fd\u0161kov\u00fd odpor p\u0159i zved\u00e1n\u00ed. Po spu\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho \u010derpadla je v\u00fd\u0161ka odst\u0159ediv\u00e9ho \u010derpadla velmi n\u00edzk\u00e1 a pr\u016ftok je velmi velk\u00fd. V t\u00e9to dob\u011b je v\u00fdkon motoru \u010derpadla (v\u00fdkon h\u0159\u00eddele) velmi velk\u00fd (podle v\u00fdkonov\u00e9 k\u0159ivky \u010derpadla), co\u017e se snadno p\u0159et\u00ed\u017e\u00ed, co\u017e po\u0161kod\u00ed motor \u010derpadla a veden\u00ed. Proto mus\u00ed b\u00fdt p\u0159i spou\u0161t\u011bn\u00ed uzav\u0159en v\u00fdtla\u010dn\u00fd ventil, aby \u010derpadlo pracovalo norm\u00e1ln\u011b.<\/p>\n

P\u0159i pou\u017eit\u00ed axi\u00e1ln\u00edho vodn\u00edho \u010derpadla je situace opa\u010dn\u00e1. Mus\u00ed b\u00fdt spu\u0161t\u011bno s otev\u0159en\u00fdm ventilem. V tomto okam\u017eiku je v\u00fdkon motoru minim\u00e1ln\u00ed. Kv\u016fli nedostatku odporu v kr\u00e1tk\u00e9m \u010dasov\u00e9m \u00faseku bude pracovat s velk\u00fdm pr\u016ftokem, co\u017e \u010dasto zp\u016fsob\u00ed vibrace \u010derpadla, hluk a dokonce p\u0159et\u00ed\u017een\u00ed motoru, kter\u00fd sho\u0159\u00ed. Uzav\u0159en\u00ed v\u00fdstupn\u00edho ventilu se rovn\u00e1 um\u011bl\u00e9mu nastaven\u00ed tlaku odporu v potrub\u00ed. Pot\u00e9, co \u010derpadlo pracuje norm\u00e1ln\u011b, pomalu ventil spou\u0161t\u011bjte, aby \u010derpadlo mohlo postupn\u011b norm\u00e1ln\u011b pracovat po sv\u00e9 v\u00fdkonov\u00e9 k\u0159ivce.<\/p>\n

P\u0159ed spu\u0161t\u011bn\u00edm odst\u0159ediv\u00e9ho \u010derpadla je t\u0159eba zajistit dva body:<\/p>\n

1) Napl\u0148te pl\u00e1\u0161\u0165 \u010derpadla vodou, aby se vytvo\u0159il podtlak;<\/p>\n

2) \u0160oup\u00e1tko na v\u00fdtla\u010dn\u00e9m potrub\u00ed mus\u00ed b\u00fdt uzav\u0159eno, aby \u010derpadlo netvo\u0159ilo proud, co\u017e m\u016f\u017ee sn\u00ed\u017eit rozb\u011bhov\u00fd proud motoru a usnadnit plynul\u00fd rozb\u011bh \u010derpadla. P\u0159i plynul\u00e9m rozb\u011bhu \u010derpadla je t\u0159eba \u0161oup\u00e1tko otev\u00edrat pomalu a v\u010das.<\/p>\n

Odst\u0159ediv\u00e9 \u010derpadlo zved\u00e1 vodu pomoc\u00ed podtlaku, kter\u00fd vznik\u00e1 v d\u016fsledku odst\u0159ediv\u00e9 s\u00edly ob\u011b\u017en\u00e9ho kola. P\u0159i spou\u0161t\u011bn\u00ed odst\u0159ediv\u00e9ho \u010derpadla je proto nutn\u00e9 nejprve uzav\u0159\u00edt v\u00fdtla\u010dn\u00fd ventil a napustit vodu. Hladina vody mus\u00ed p\u0159esahovat \u010d\u00e1st ob\u011b\u017en\u00e9ho kola a vzduch v odst\u0159ediv\u00e9m \u010derpadle mus\u00ed b\u00fdt p\u0159ed spu\u0161t\u011bn\u00edm vypu\u0161t\u011bn. Po spu\u0161t\u011bn\u00ed se kolem ob\u011b\u017en\u00e9ho kola vytvo\u0159\u00ed podtlak, kter\u00fd nasaje vodu sm\u011brem vzh\u016fru, a m\u016f\u017ee se automaticky otev\u0159\u00edt, aby se voda zvedla. Proto mus\u00ed b\u00fdt nejprve uzav\u0159en v\u00fdstupn\u00ed ventil.<\/p>\n

2. O odst\u0159ediv\u00e9m \u010derpadle<\/p>\n

Odst\u0159ediv\u00e9 \u010derpadlo je lopatkov\u00e9 \u010derpadlo, jeho\u017e z\u00e1kladem je rotuj\u00edc\u00ed ob\u011b\u017en\u00e9 kolo. B\u011bhem procesu ot\u00e1\u010den\u00ed lopatky v d\u016fsledku interakce mezi lopatkami a kapalinou p\u0159ed\u00e1vaj\u00ed kapalin\u011b mechanickou energii, \u010d\u00edm\u017e se zvy\u0161uje tlak kapaliny a dosahuje se \u00fa\u010delu dopravy kapaliny. Provoz odst\u0159ediv\u00e9ho \u010derpadla m\u00e1 n\u00e1sleduj\u00edc\u00ed charakteristiky:<\/p>\n

1\uff09V\u00fdtlak vytv\u00e1\u0159en\u00fd odst\u0159ediv\u00fdm \u010derpadlem p\u0159i ur\u010dit\u00fdch ot\u00e1\u010dk\u00e1ch m\u00e1 omezenou hodnotu. Pr\u016ftok v pracovn\u00edm bod\u011b a v\u00fdkon h\u0159\u00eddele z\u00e1vis\u00ed na podm\u00ednk\u00e1ch soustavy za\u0159\u00edzen\u00ed p\u0159ipojen\u00fdch k \u010derpadlu (rozd\u00edl poloh, rozd\u00edl tlak\u016f a ztr\u00e1ty v potrub\u00ed). V\u00fdtlak se m\u011bn\u00ed s pr\u016ftokem.<\/p>\n

2) Stabiln\u00ed provoz, nep\u0159etr\u017eit\u00e1 dod\u00e1vka, bez pulzac\u00ed pr\u016ftoku a tlaku.<\/p>\n

3) Obecn\u011b nem\u00e1 samonas\u00e1vac\u00ed schopnost, \u010derpadlo mus\u00ed b\u00fdt napln\u011bno kapalinou nebo mus\u00ed b\u00fdt potrub\u00ed p\u0159ed zah\u00e1jen\u00edm pr\u00e1ce odvzdu\u0161n\u011bno.<\/p>\n

4) Odst\u0159ediv\u00e1 \u010derpadla se spou\u0161t\u011bj\u00ed se zav\u0159en\u00fdm ventilem v\u00fdtla\u010dn\u00e9ho potrub\u00ed a v\u00ed\u0159iv\u00e1 \u010derpadla a axi\u00e1ln\u00ed \u010derpadla se spou\u0161t\u011bj\u00ed s pln\u011b otev\u0159en\u00fdm ventilem, aby se sn\u00ed\u017eil startovac\u00ed v\u00fdkon.<\/p>\n

 <\/p>\n

\"20250627145030\"<\/p>\n

P\u0159ed spu\u0161t\u011bn\u00edm \u010derpadla se pl\u00e1\u0161\u0165 \u010derpadla napln\u00ed dopravovanou kapalinou; po spu\u0161t\u011bn\u00ed se ob\u011b\u017en\u00e9 kolo poh\u00e1n\u011bn\u00e9 h\u0159\u00eddel\u00ed ot\u00e1\u010d\u00ed vysokou rychlost\u00ed a kapalina mezi lopatkami se mus\u00ed ot\u00e1\u010det tak\u00e9 s n\u00edm. P\u016fsoben\u00edm odst\u0159ediv\u00e9 s\u00edly je kapalina vr\u017eena ze st\u0159edu ob\u011b\u017en\u00e9ho kola k vn\u011bj\u0161\u00edmu okraji a z\u00edsk\u00e1v\u00e1 energii, p\u0159i\u010dem\u017e vysokou rychlost\u00ed opou\u0161t\u00ed vn\u011bj\u0161\u00ed okraj ob\u011b\u017en\u00e9ho kola a vstupuje do spir\u00e1ln\u00edho t\u011blesa \u010derpadla.<\/p>\n

Ve spir\u00e1le se kapalina zpomaluje v d\u016fsledku postupn\u00e9ho roz\u0161i\u0159ov\u00e1n\u00ed pr\u016fto\u010dn\u00e9ho kan\u00e1lu a \u010d\u00e1st kinetick\u00e9 energie se p\u0159em\u011b\u0148uje na statickou tlakovou energii a nakonec proud\u00ed do v\u00fdtla\u010dn\u00e9ho potrub\u00ed pod vy\u0161\u0161\u00edm tlakem a je pos\u00edl\u00e1na na po\u017eadovan\u00e9 m\u00edsto. Kdy\u017e kapalina proud\u00ed ze st\u0159edu ob\u011b\u017en\u00e9ho kola k vn\u011bj\u0161\u00edmu okraji, vznik\u00e1 ve st\u0159edu ob\u011b\u017en\u00e9ho kola ur\u010dit\u00fd podtlak. Proto\u017ee tlak nad hladinou kapaliny v z\u00e1sobn\u00ed n\u00e1dr\u017ei je vy\u0161\u0161\u00ed ne\u017e tlak na vstupu do \u010derpadla, kapalina je neust\u00e1le vtla\u010dov\u00e1na do ob\u011b\u017en\u00e9ho kola. Je patrn\u00e9, \u017ee dokud se ob\u011b\u017en\u00e9 kolo ot\u00e1\u010d\u00ed, kapalina se neust\u00e1le nas\u00e1v\u00e1 a vypou\u0161t\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"

When starting a centrifugal pump, you need to pay attention to a lot of things. Should you close the outlet valve when starting a centrifugal pump? The answer is that you need to close it! 1: Why should the outlet valve be closed when starting a centrifugal pump? When the centrifugal water pump is started, […]<\/p>","protected":false},"author":4,"featured_media":1509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[36],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/posts\/1505"}],"collection":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/comments?post=1505"}],"version-history":[{"count":0,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/posts\/1505\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/media\/1509"}],"wp:attachment":[{"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/media?parent=1505"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/categories?post=1505"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tflequip.com\/cs\/wp-json\/wp\/v2\/tags?post=1505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}