0102030405
Iyo inoyerera coefficient uye cavitation coefficient yevhavha inotsanangurwa mukuenzanisa tafura yekumanikidza uye kupisa kweiyo valve zvinhu.
2022-07-11
Iyo inoyerera coefficient uye cavitation coefficient yevhavha inotsanangurwa mukuenzanisa tafura yekumanikidza uye tembiricha yemidziyo yevhavha Iyo yakakosha parameter yevhavha ndiyo inoyerera coefficient uye cavitation coefficient yevhavha, iyo inowanzo kuwanikwa mune data yevhavha inogadzirwa. munyika dzepamusoro maindasitiri, uye kunyange kudhindwa mumuenzaniso. Nyika yedu inogadzira vharuvhu haina ruzivo urwu, nekuti tora chikamu ichi chedata chinoda kuita bvunzo kuti ugone kuisa kumberi, ino inyika yedu uye pasirese danho repamusoro revhavha gap imwe yeakakosha kuita. . A, kuyerera kwevhavha yevhavha yevhavha inoyerera ndiyo chiyero chevhavha inoyerera simba index, iyo yakakura yekuyerera kweyekukoshera kukosha, iyo inoyerera inoyerera nepakati pevhavha kana kudzvinyirira kurasikirwa kuri kudiki. Zvinoenderana neKV kukosha kwekuverenga formula Ipi: KV -- kuyerera coefficient Q -- vhoriyamu kuyerera m3/h δ P -- valve pressure kurasikirwa barP -- fluid density kg/m3 Mbiri, valve cavitation coefficient Iyo cavitation coefficient δ kukosha inoshandiswa kuona. rudzii rwekuvaka vharafu kusarudza kuyerera kuyerera. Ikoko: H1 -- pressure mH2 -- musiyano pakati pemhepo yemhepo uye saturated vapor pressure inoenderana nekushisa M δ P - musiyano pakati pekumanikidzwa pamberi uye shure kwevharuvhu M Iyo inobvumirwa cavitation coefficient δ inosiyana pakati pemavharuvhu nekuda kwemaitiro awo akasiyana. Sezvakaratidzwa mumufananidzo. Kana iyo yakaverengwa cavitation coefficient yakakura kudarika inobvumirwa cavitation coefficient, chirevo chacho chinoshanda uye cavitation haizoitiki. Kana iyo inobvumirwa cavitation coefficient iri 2.5, zvino: Kana δ2.5, cavitation haizoitiki. Pa 2.5δ1.5, zvishoma cavitation inoitika. Pa delta 1.5, kudedera kunoitika. Kuenderera mberi nekushandisa δ0.5 kuchakuvadza vharafu uye kudzika kwepombi. Iwo ekutanga uye anoshanda maitiro curves emavharuvhu haaratidze kana cavitation inoitika, rega rega pane iyo iyo muganhu wekushanda unosvika. Kuburikidza pamusoro kukarukureta zvakajeka. Naizvozvo, cavitation inoitika nekuti kana pombi yerotor ichipfuura nechikamu chechikamu chinodzikira mukuita kwemvura inokurumidza kuyerera, chikamu chemvura chinoputika, uye mabhuru anogadzirwa anobva aputika muchikamu chakavhurika mushure mevharuvhu, ine zviratidzo zvitatu: (1) Noise (2) vibration (kukuvadza kwakakomba kwenheyo uye zvimiro zvine hukama, zvichikonzera kuneta kuputsika) (3) Kukuvadzwa kwezvinhu (kukoromoka kwevharuvhu muviri uye pombi) Kubva pakuverenga pamusoro, hazvisi zvakaoma kuona iyo cavitation. yakabatana zvakanyanya nekumanikidza H1 mushure mevhavha. Kuwedzera H1 zvichava pachena kuchinja mamiriro ezvinhu uye kuvandudza nzira: A. Isa valve yakaderera mumutsara. B. Isai ndiro ye orifice mupombi kuseri kwevhavha kuti iwedzere kuramba. C. Ivhavha yevhavha yakazaruka uye yakananga inounganidza dura, iyo inowedzera nzvimbo yekuputika kwebubble uye inoderedza cavitation erosion. Kuongorora kwakadzama kwezvina zviri pamusoro apa, muchidimbu vharafu yegedhi, shavishavi vharuvhu maitiro makuru uye paramita runyorwa kuitira nyore kusarudza. Zvikamu zviviri zvakakosha zvinoita basa rakakosha mukushanda kwevharuvhu. Valve zvinhu kudzvinyirirwa uye tembiricha kuenzanisa tafura vharafu indasitiri insiders vanoziva kuti kusarudzwa vharafu zvinhu vanofanira kusarudza maererano vharafu ouinjiniya kumanikidza uye tembiricha inoshanda, zvinhu zvakasiyana mukumanikidzwa uye tembiricha zvakatipoteredza hazvina kufanana, tinotarisa kudzora ukama. Vemukati muindasitiri yevharuvhu vanoziva kuti kusarudzwa kwezvinhu zvevharuvhu zvinoda kusarudzwa zvinoenderana nekumanikidza kweinjiniya uye tembiricha inoshanda yevharuvhu. Kudzvinyirirwa uye tembiricha mamiriro ezvinhu akasiyana-siyana haana kufanana. Ngatitarisei hukama hwekusiyanisa pakati pavo. Valve zvinhu kudzvinyirirwa uye tembiricha kuenzanisa tafura Valve zvinhu kumanikidzwa uye tembiricha kuenzanisa tafura Gray kukandira simbi: Gray kukandira simbi yakakodzera mvura, chiutsi, mhepo, gasi uye mafuta ane zita kumanikidzwa PN≤ 1.0mpa uye tembiricha -10 ℃ ~ 200 ℃. Magiredhi akajairika egrey cast iron ndeaya: HT200, HT250, HT300, HT350. Malleable cast iron: Inokodzera kudzvanywa kwezita PN≤ 2.5mpa, tembiricha ye -30 ~ 300 ℃ yemvura, chiutsi, mhepo uye mafuta svikiro, zvinowanzoshandiswa mhando ndezvi: KTH300-06, KTH330-08, KTH350-10. Ductile iron: Inokodzera mvura, chiutsi, mhepo uye mafuta nePN≤4.0MPa uye tembiricha ye -30 ~ 350 ℃. Zvishandiso zvinowanzoshandiswa ndezvi: QT400-15, QT450-10, QT500-7. Tichitarisa danho razvino retekinoroji yemumba, fekitori yega yega haina kuenzana, uye vashandisi kazhinji havasi nyore kuyedza. Maererano nezvakaitika, zvinokurudzirwa kuti PN≤ 2.5mpa, valve yesimbi yakachengeteka. Acid inodzivirira yakakwira silicon ductile iron: Inokodzera corrosive media ine zita rekumanikidza PN≤ 0.25mpa uye tembiricha iri pasi pe120 ℃. Carbon steel: Inokodzera mvura, chiutsi, mhepo, hydrogen, ammonia, nitrogen uye petroleum zvigadzirwa zvine zita rekumanikidza PN≤32.0MPa uye tembiricha -30 ~ 425 ℃. Inowanzoshandiswa mamakisi WC1, WCB, ZG25 uye unhu simbi 20, 25, 30 uye yakaderera alloy structural simbi 16Mn. Inokodzera mvura, mvura yegungwa, okisijeni, mhepo, mafuta uye mamwe midhiya ane PN≤ 2.5mpa, pamwe nemhepo yemhepo ine tembiricha -40 ~ 250 ℃, iyo inowanzoshandiswa muchiso ndeye ZGnSn10Zn2 (tin bronze), H62, HPB59-1 (ndarira), QAZ19-2, QA19-4 (aluminum bronze). Yakakwira tembiricha yemhangura: Inokodzera muutsi uye petroleum zvigadzirwa zvine zita rekumanikidza PN≤ 17.0mpa uye tembiricha ≤570 ℃. Inowanzoshandiswa brand ZGCr5Mo, 1 cr5m0. ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, etc. Kusarudzwa kwakananga kunofanira kuenderana nekumanikidzwa kwevharuvhu uye kutaridzika kwekushisa.