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氟塑料泵和不銹鋼泵都是具有耐腐蝕性能泵，氟塑料泵一般分為，氟塑料離心泵，氟塑料磁力泵，氟塑料合金泵。不銹鋼泵可分為，不銹鋼離心泵，不銹鋼磁力泵。氟塑料泵和不銹鋼泵都有立式結(jié)構(gòu)和臥式結(jié)構(gòu)，具有自吸，磁力，離心等形式，那么這兩種耐腐蝕泵在性能上有什么區(qū)別呢？氟塑料材質(zhì)又稱為塑料王，可輸送任意濃度的強(qiáng)酸，強(qiáng)堿，強(qiáng)腐蝕溶液，一般不銹鋼材質(zhì)適合輸送輕腐液體，不銹鋼泵耐溫耐磨效果較好，氟塑料泵耐腐蝕效果好，這是整體性能的優(yōu)缺地方。從結(jié)構(gòu)上面，由于不銹鋼泵與塑料泵性能上的差異，不銹鋼泵的結(jié)構(gòu)設(shè)計(jì)有以下特殊性。

Fluoroplastics pumps and stainless steel pumps are corrosion-resistant pumps, fluoroplastics pumps are generally divided into fluoroplastics centrifugal pumps, fluoroplastics magnetic pumps, fluoroplastics alloy pumps. Stainless steel pump can be divided into stainless steel centrifugal pump, stainless steel magnetic pump. Fluoroplastics pump and stainless steel pump have vertical and horizontal structure, with self-priming, magnetic, centrifugal and other forms, so what is the difference in performance between the two anti-corrosion pumps? Fluoroplastics material, also known as plastic king, can transport any concentration of strong acid, strong alkali, strong corrosive solution. Generally, stainless steel material is suitable for conveying light rotten liquid. Stainless steel pump has better temperature resistance and wear resistance, and fluoroplastics pump has good corrosion resistance, which is the advantage and disadvantage of the overall performance. Structurally, due to the difference in performance between stainless steel pump and plastic pump, the structural design of stainless steel pump has the following particularities.

氟塑料泵

Fluoroplastic pump

一、葉輪與軸的連接形式

I. Connection Form of Impeller and Shaft

1、葉輪內(nèi)預(yù)埋金屬件，通過(guò)金屬件與軸用鍵連接，或葉輪與軸直接用鍵連接，葉輪端部用葉輪螺母保護(hù)。此結(jié)構(gòu)來(lái)源于金屬泵，由于密封面多，可靠性較差。長(zhǎng)時(shí)間使用后，軸易被介質(zhì)腐蝕。

1. The metal parts embedded in the impeller are connected with the shaft by keys, or the impeller is directly connected with the shaft by keys, and the end of the impeller is protected by impeller nuts. This structure comes from metal pump, because of many sealing surfaces, the reliability is poor. After a long time of use, the shaft is easily corroded by medium.

2、葉輪內(nèi)預(yù)埋金屬件，與泵軸用螺紋連接，取消葉輪螺母。此結(jié)構(gòu)可使軸完全受到保護(hù)，避免軸被介質(zhì)腐蝕的可能。缺點(diǎn)是螺紋加工精度要求較高，運(yùn)轉(zhuǎn)時(shí)嚴(yán)禁電動(dòng)機(jī)反轉(zhuǎn)。

2. The metal parts embedded in the impeller are connected with the pump shaft by threads, and the impeller nuts are cancelled. This structure can protect the shaft completely and avoid the possibility of the shaft being corroded by the medium. The disadvantage is that the thread processing accuracy is required to be high, and motor inversion is strictly prohibited when running.

不銹鋼泵

Stainless steel pump

二、泵體襯里層厚度及其固定

2. Thickness and Fixation of Pump Body Lining Layer

按泵企業(yè)標(biāo)準(zhǔn)，襯里層厚度一般為5-8mm，如果襯里層過(guò)薄(如1.5~2mm)，是壓制過(guò)程易出現(xiàn)局部襯里缺陷，導(dǎo)致泵的允許使用溫度和使用壽命有所下降，襯里層從泵體和后蓋基體金屬脫落的可能性也增大。

According to pump enterprise standards, the thickness of lining layer is generally 5-8 mm. If the lining layer is too thin (e.g. 1.5-2 mm), local lining defects are likely to occur during the pressing process, resulting in a decrease in the allowable operating temperature and service life of the pump, and the possibility of the lining layer falling off from the base metal of the pump body and back cover is also increased.

襯里層固定方式可采取在基體金屬上布置較密的環(huán)形燕尾槽的方法，使襯里層固定牢靠，同時(shí)機(jī)加工量較小。也可用基體金屬上布置較密小孔（或螺紋孔）的方法，襯里層固定不如燕尾槽牢靠。

The method of fixing the lining layer can adopt the method of arranging dense annular dovetail groove on the base metal, so that the lining layer can be fixed firmly and the machining quantity is small. It can also use the method of arranging denser holes (or threaded holes) on the base metal. The lining layer is not as fixed as the swallow tail groove.

氟塑料泵

Fluoroplastic pump

三、接口

Three, interface

塑料泵進(jìn)出口的接管的受力目前尚未有相關(guān)的標(biāo)準(zhǔn)加以限定，一般由設(shè)計(jì)單位提出要求，并根據(jù)制造廠自身的制造情況而定。對(duì)于整體塑料泵殼，一般采用活套法蘭方式與管道連接，活套法蘭與兩端蓋板連接；還可采用把法蘭與蓋板做成整體的方式與管道連接。

At present, there is no relevant standard to limit the force on the inlet and outlet nozzles of plastic pumps. Generally, it is required by the design unit, and it depends on the manufacturing conditions of the manufacturer itself. For integral plastic pump shell, looper flange is usually used to connect with pipeline, looper flange is connected with both ends of cover plate, and flange and cover plate can also be used to make integral connection with pipeline.

四、葉輪密封處和背葉片與泵體的運(yùn)轉(zhuǎn)間隙

4. Operating Clearance between Impeller Seal and Back Blade and Pump Body

因塑料和玻璃鋼的線脹系數(shù)比鋼大2~6倍，沿用不銹鋼泵的運(yùn)轉(zhuǎn)間隙易發(fā)生咬合，使泵損壞。間隙過(guò)大又會(huì)使泵的效率降低，并造成泵軸向力的不平衡。由于徑向間隙不可調(diào)節(jié)，也可考慮采用軸向間隙，這樣無(wú)需拆泵，即可檢查并調(diào)節(jié)運(yùn)轉(zhuǎn)間隙，為了防止溫度變化引起的塑料泵殼上脫落或開裂，可考慮在泵殼上焊接龜甲絲網(wǎng)，從而使得襯塑泵可以做到較大規(guī)格型號(hào)，進(jìn)口管徑可達(dá)DN600。

Because the linear expansion coefficient of plastics and FRP is 2-6 times larger than that of steel, it is easy to bite along the running clearance of stainless steel pump, which causes damage to the pump. Excessive clearance will reduce the efficiency of the pump and cause the unbalance of the axial force of the pump. Because the radial clearance is not adjustable, the axial clearance can also be considered, so that the operating clearance can be checked and adjusted without dismantling the pump. In order to prevent the plastic pump shell from falling off or cracking caused by temperature change, the tortoise shell wire mesh can be welded on the pump shell, so that the lining pump can achieve a larger size and the diameter of the inlet pipe can reach DN600.

五、軸向平衡力

V. Axial Equilibrium Force

氟塑料泵的葉輪內(nèi)埋有金屬件，一般不宜用平衡孔的方法平衡軸向力。國(guó)內(nèi)外普遍采用背葉片平衡軸向力。

Metal parts are embedded in the impeller of fluoroplastics pump. Generally, it is not appropriate to balance the axial force by means of balancing holes. Back blade balancing axial force is widely used at home and abroad.