What are the maintenance requirements of chemical pump parts?1 chemical pump coupling equipment chemical pump coupling are rigid coupling and coupling of tooth profile (1) the rigid coupling rigid coupling general use on the smaller power of centrifugal pump, the connecting bolt at the first remove the maintenance and rubber elastic ring, the liquid temperature is not high, the two coupling plane clearance for 2. 2 ~ 4. 2 mm, the temperature is high,The rubber elastic ring of the coupling shall be 0. 15~0. 35 mm smaller than the diameter of the perforation. At the same time, special tools must be used during disassembly to keep it clean and clean.Check the engagement of coupling tooth surface, the contact area along the tooth height is not less than 50%, along the tooth width is not less than 70%, the tooth surface is not allowed to have serious pitting wear and crack;The radial runout of outer gear ring of stainless steel pump coupling shall not be greater than 0.03mm, and the runout of end face circle shall not be greater than 0.02mm;If the gear ring needs to be removed, special tools must be used, do not knock, so as to avoid bending or damage to the shaft. When reassembling, the gear ring should be heated to about 200 and then installed on the shaft. The interference between the outer gear ring and the shaft is generally 0.01 ~ 0.03mm.The indirect tube or other parts shall be assembled according to the original mark and data when being reassembled.2. Maintenance of the dynamic seal part of chemical pump; the dynamic seal of centrifugal pump refers to the seal of the impeller orifice ring. The general radius direction should be controlled at 0.20 ~ 0.45mm.Clearance is too large, easy to cause the vibration of the pump shaft sleeve and lining ring gap radius direction is commonly 0. 2 ~ 0. 6 mm 3 chemical pump static sealing part of the overhaul chemical pump static seal parts including pump body subdivision surface bearing gland and the combination of the bearing housing surface lubricating oil system of import and export of tube flange joint, etc., such as maintenance does not guarantee no leakage, also make the sealing of the pump can not run the above, as long as the types according to choose the suitable adhesives and gaskets,To ensure no leakage is now generally use subdivision surface adhesive for ntu 703 ntu 704 4 impeller and the rotor repair common corrosion resistant chemical pump is single stage impeller or more single stage double suction type rotor first check the impeller maintenance and clean appearance, whether replacement of spare parts, install the new impeller or cleaning the old impeller, returned it after all to do static equilibrium, when it is necessary to do dynamic balance of the impeller and shaft cooperate with H/H, when installing impeller key and the key to the correct contact for the rotor part of trunnion allows bending is not greater than 0. 013 mm,For low-speed shaft, the maximum bending should be less than 0.07mm; for high-speed shaft, the maximum bending should be less than 0.04mm. H/ H is adopted for the assembly of shaft sleeve part and shaft. For the shaft of rotor part, the radial runout of shaft shall not be greater than 0.013mm, shaft sleeve shall not be greater than 0.02mm, and impeller orifice ring shall not be greater than 0.04mm after maintenance.Impeller face runout is not greater than 0. 23 mm on both ends of the diameter of axle is not greater than 0. 02 mm but for more complex centrifugal pump structure, the data standard varies according to the state of pump for 5 of the mechanical seal maintenance overhaul, chemical process pump seal should be right down the plane with specialized tools dynamic static seal ring, and check the abrasion of end face, all installed seal of pump rotor, regardless of size, power are dynamic or static balance test should be done in order to ensure the seal is not leak, can be on the bench platform of dynamic and static compaction, pour water do leakage test,If static water doesn't leak,It indicates that the surface roughness and flatness of the sealing surface meet the requirements. When installed, the vertical deviation of the end surface shall not be greater than 0. 015 mm1500 ~ 3500 0. 05 after installation of the shaft axial channeling momentum is not greater than 0. 45 mm should emphasize mechanical seal is installed, according to the requirement must be turning, and check the cooling water section is reliable, prevent leakage or damage to the machine after rotation sealing end surface chemical plant most of the mechanical seal of pump used for single stage double tandem seal is decorated, but no matter what kind of seal leakage can be decorate both phenomena (1) single stage pump seal arrangement of single-stage pump seal arrangement as shown in figure 3 single-stage seal installation,(2) double-stage sealing arrangement of machine pump double-stage sealing arrangement as shown in FIG. 4 when double-stage sealing is installed, the size and gap of positioning ring must be guaranteed, and the positioning ring can be pushed to the position at one time, and the o-ring cannot be out of groove, otherwise the sealing surface of the machine will be damaged

化工泵的各零部件檢修要求是什么？

　　1　化工泵聯(lián)軸器檢修

　　化工泵聯(lián)軸器主要有剛性聯(lián)軸器和齒形聯(lián)軸器。

　　(1) 剛性聯(lián)軸器

　　剛性聯(lián)軸器一般用在功率較小的離心泵上, 檢修時(shí)首先拆下聯(lián)接螺栓和橡皮彈性圈, 對溫度不高的液體, 兩聯(lián)軸器的平面間隙為2. 2～4. 2 mm , 溫度較高時(shí), 應大于前竄量1. 55～2. 05 mm。聯(lián)軸器橡膠彈性圈比穿孔直徑應小0. 15～0. 35 mm。同時(shí)拆裝時(shí)一定要用專(zhuān)用工具, 保持光潔, 不允許有碰傷劃傷。

　　(2) 齒形聯(lián)軸器

　　齒形聯(lián)軸器撓性較好, 有自動(dòng)對中性能。檢修時(shí)一般按以下方法進(jìn)行:

　?、贆z查聯(lián)軸器齒面嚙合情況, 其接觸面積沿齒高不小于50 % , 沿齒寬不小于70 % , 齒面不得有嚴重點(diǎn)蝕、磨損和裂紋;

　?、诓讳P鋼泵聯(lián)軸器外齒圈徑向跳動(dòng)不大于0. 03 mm , 端面圓跳動(dòng)不大于0. 02 mm;

　?、廴粜璨鹣慢X圈, 必須用專(zhuān)用工具, 不可敲打, 以免使軸彎曲或損傷。當回裝時(shí), 應將齒圈加熱到200 ℃左右再裝到軸上。外齒圈與軸的過(guò)盈量一般為0. 01～0. 03 mm;

　?、芑匮b中間接筒或其他部件時(shí), 應按原有標記和數據裝配;

　?、萦昧匕崾志鶆虻匕崖菟〝Q緊。

　　2　化工泵動(dòng)密封部分的檢修

　　離心泵機泵的動(dòng)密封是指葉輪口環(huán)部位的密封, 一般半徑方向應控制在0. 20～0. 45 mm。若間隙太小,組裝后盤(pán)車(chē)困難; 間隙太大, 容易造成泵的振動(dòng)。軸套和襯環(huán)間隙半徑方向一般為0. 2～0. 6 mm。

　　3　化工泵靜密封部分的檢修

　　化工泵靜密封部分包括泵體剖分結合面、軸承壓蓋與軸承箱體的結合面、潤滑油系統的接頭、進(jìn)出口管的法蘭等, 如檢修不能保證無(wú)泄漏, 也同樣使泵不能運行。上述部位的密封, 只要根據介質(zhì)選準適用的膠粘劑和墊片, 即能保證無(wú)泄漏?，F一般使用的剖分結合面膠粘劑為南大703、南大704。

　　4　葉輪和轉子的檢修

　　常用耐腐蝕化工泵多為單級葉輪或單級雙吸式轉子。檢修時(shí)首先檢查葉輪外觀(guān)并清洗干凈, 不管是更換備件安裝新葉輪, 還是清洗舊葉輪, 回裝后均要做靜平衡, 必要時(shí)還要做動(dòng)平衡。葉輪和軸的配合采用H/ h , 安裝葉輪時(shí)鍵和鍵槽要正確接觸。對于轉子部分的軸徑允許彎曲不大于0. 013mm , 對于低速軸彎曲應小于0. 07 mm , 對高速軸彎曲應小于0. 04 mm。軸套部分與軸的裝配采用H/ h。

　　對于轉子部分的軸, 檢修后軸徑向跳動(dòng)不大于0. 013 mm , 軸套不大于0. 02 mm , 葉輪口環(huán)不大于0. 04 mm , 葉輪端面跳動(dòng)不大于0. 23 mm。兩端軸徑不大于0. 02 mm。但對于結構較復雜的離心泵,上述數據根據泵的狀況標準而有所變化。

　　5 　機械密封的檢修

　　對化工流程泵機封檢修時(shí), 應先用專(zhuān)用工具正確拆下機封的動(dòng)、靜環(huán), 并檢查端面磨損情況, 凡是裝機封的泵轉子, 不管功率大小, 均應做動(dòng)或靜平衡試驗。為保證密封不泄漏, 可在鉗工平臺上把動(dòng)靜面壓緊, 倒上水做滲漏試驗, 如果靜態(tài)水不漏, 說(shuō)明密封面的表面粗糙度和平面度均符合要求。安裝時(shí)端面垂直度偏差不大于0. 015 mm。部分軸或軸套的徑向跳動(dòng)值如表5。

　　轉速 / (r.min -1)徑向跳動(dòng)允差 / mm轉速 / (r.min-1)徑向跳動(dòng)允差 / mm

　　750～1200≤0. 083500～7200≤0. 03

　　1200～1500≤0. 067200～10000≤0. 02

　　1500～3500≤0. 05

　　安裝后其軸的軸向竄動(dòng)量不大于0. 45 mm。應著(zhù)重說(shuō)明的是機械密封按要求裝好后, 一定要盤(pán)車(chē), 并檢查冷卻水部分是否可靠, 防止轉動(dòng)后泄漏或損壞機封端面?；S(chǎng)所用機泵的機械密封大多為單級、雙級、串聯(lián)式密封布置, 但不管哪種密封布置均不能有泄漏現象。

　　(1) 機泵單級密封布置

　　機泵單級密封布置如圖3。

　　單級密封安裝時(shí), 必須保證動(dòng)、靜環(huán)平行, 軸套、軸頸部位不應有毛刺和劃傷。(2) 機泵雙級密封布置機泵雙級密封布置如圖4。雙級布置密封安裝時(shí)一定保證定位環(huán)尺寸和間隙, 并一次推到位置, O 形環(huán)不能脫出凹槽, 否則損壞機封密封面。