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

化工泵的各零部件检修要求是什么？

　　1　化工泵联轴器检修

　　化工泵联轴器主要有刚性联轴器和齿形联轴器。

　　(1) 刚性联轴器

　　刚性联轴器一般用在功率较小的离心泵上, 检修时首先拆下联接螺栓和橡皮弹性圈, 对温度不高的液体, 两联轴器的平面间隙为2. 2～4. 2 mm , 温度较高时, 应大于前窜量1. 55～2. 05 mm。联轴器橡胶弹性圈比穿孔直径应小0. 15～0. 35 mm。同时拆装时一定要用专用工具, 保持光洁, 不允许有碰伤划伤。

　　(2) 齿形联轴器

　　齿形联轴器挠性较好, 有自动对中性能。检修时一般按以下方法进行:

　　①检查联轴器齿面啮合情况, 其接触面积沿齿高不小于50 % , 沿齿宽不小于70 % , 齿面不得有严重点蚀、磨损和裂纹;

　　②不锈钢泵联轴器外齿圈径向跳动不大于0. 03 mm , 端面圆跳动不大于0. 02 mm;

　　③若需拆下齿圈, 必须用专用工具, 不可敲打, 以免使轴弯曲或损伤。当回装时, 应将齿圈加热到200 ℃左右再装到轴上。外齿圈与轴的过盈量一般为0. 01～0. 03 mm;

　　④回装中间接筒或其他部件时, 应按原有标记和数据装配;

　　⑤用力矩搬手均匀地把螺栓拧紧。

　　2　化工泵动密封部分的检修

　　离心泵机泵的动密封是指叶轮口环部位的密封, 一般半径方向应控制在0. 20～0. 45 mm。若间隙太小,组装后盘车困难; 间隙太大, 容易造成泵的振动。轴套和衬环间隙半径方向一般为0. 2～0. 6 mm。

　　3　化工泵静密封部分的检修

　　化工泵静密封部分包括泵体剖分结合面、轴承压盖与轴承箱体的结合面、润滑油系统的接头、进出口管的法兰等, 如检修不能保证无泄漏, 也同样使泵不能运行。上述部位的密封, 只要根据介质选准适用的胶粘剂和垫片, 即能保证无泄漏。现一般使用的剖分结合面胶粘剂为南大703、南大704。

　　4　叶轮和转子的检修

　　常用耐腐蚀化工泵多为单级叶轮或单级双吸式转子。检修时首先检查叶轮外观并清洗干净, 不管是更换备件安装新叶轮, 还是清洗旧叶轮, 回装后均要做静平衡, 必要时还要做动平衡。叶轮和轴的配合采用H/ h , 安装叶轮时键和键槽要正确接触。对于转子部分的轴径允许弯曲不大于0. 013mm , 对于低速轴弯曲应小于0. 07 mm , 对高速轴弯曲应小于0. 04 mm。轴套部分与轴的装配采用H/ h。

　　对于转子部分的轴, 检修后轴径向跳动不大于0. 013 mm , 轴套不大于0. 02 mm , 叶轮口环不大于0. 04 mm , 叶轮端面跳动不大于0. 23 mm。两端轴径不大于0. 02 mm。但对于结构较复杂的离心泵,上述数据根据泵的状况标准而有所变化。

　　5 　机械密封的检修

　　对化工流程泵机封检修时, 应先用专用工具正确拆下机封的动、静环, 并检查端面磨损情况, 凡是装机封的泵转子, 不管功率大小, 均应做动或静平衡试验。为保证密封不泄漏, 可在钳工平台上把动静面压紧, 倒上水做渗漏试验, 如果静态水不漏, 说明密封面的表面粗糙度和平面度均符合要求。安装时端面垂直度偏差不大于0. 015 mm。部分轴或轴套的径向跳动值如表5。

　　转速 / (r.min -1)径向跳动允差 / mm转速 / (r.min-1)径向跳动允差 / mm

　　750～1200≤0. 083500～7200≤0. 03

　　1200～1500≤0. 067200～10000≤0. 02

　　1500～3500≤0. 05

　　安装后其轴的轴向窜动量不大于0. 45 mm。应着重说明的是机械密封按要求装好后, 一定要盘车, 并检查冷却水部分是否可靠, 防止转动后泄漏或损坏机封端面。化工厂所用机泵的机械密封大多为单级、双级、串联式密封布置, 但不管哪种密封布置均不能有泄漏现象。

　　(1) 机泵单级密封布置

　　机泵单级密封布置如图3。

　　单级密封安装时, 必须保证动、静环平行, 轴套、轴颈部位不应有毛刺和划伤。(2) 机泵双级密封布置机泵双级密封布置如图4。双级布置密封安装时一定保证定位环尺寸和间隙, 并一次推到位置, O 形环不能脱出凹槽, 否则损坏机封密封面。