食品机械中泵的材料和结构该怎样选择

 

　　除了材料选择和加工过程中食品接触面的选择之外，食品工业还必须选择系统维护时，用于输送酸性和碱性清洗流体的管线和储罐设备，以及选择满足各种环境标准的使用腐蚀性化学品进行污水处理的设备。

 

　　In addition to the choice of food contact material selection and processing, food industry has to choose the system maintenance, for delivery of acidic and alkaline cleaning fluid pipelines and storage equipment, and can meet the use of chemicals corrosive environmental standards for sewage treatment equipment.

 

　　食品应用中要求的泵，其制造材料不能与产品发生化学反应或者以任何方式影响产品味道、颜色和其他特点。非食品接触流体设备设计因素包括减少维修和停车时间、增加产量和降低成本等，还有与供货商知识和服务有关的很多难以确定的因素。

 

　　Food requirements of the application of pumps, their material should not react chemically with the products or in any way affect product taste, color and other characteristics. Non food contact fluid equipment design factors which reduce the repair and parking time, increase yield and reduce the cost, there are a lot of related knowledge and service suppliers to determine the factors.

 

　　一种用途引起另一种用途

 

　　A use by another application

 

　　人们对塑料泵的兴趣开始于50多年前，当时制造了一种Vanton挠性线型螺状旋转泵以满足心脏/肺手术中对泵的严格要求。这种原始泵独特但简单的结构限制流体只接触两个基本部件：固体塑料泵体和粗糙的合成橡胶模制衬里。它解决了与无污染处理人体血液或者影响血液相关的两个主要问题。首先，它避免了金属污染的所有危险，因为接触材料对血液不产生污染或者与之发生化学反应。其次，它柔和的运动在血液输送过程中也不损害血液细胞。这种泵被接受的另一个原因是其结构的简单。它不包含阀门、密封、填料或者垫片。其拆卸清洗和再组装简单快捷。

 

　　People interested in plastic pump began 50 years ago, when making a Vanton flexible linear spiral rotary pump to meet the heart / lung operation of pump in the strict requirements. This unique original pump but simple structural constraints fluid contacts only the two basic components: solid plastic pump body and rough synthetic rubber molded lining. It solves the pollution-free treatment with human blood or blood related effects of two main problems. First, it avoids all the dangerous metal pollution, because contact materials on the blood does not produce pollution or chemical reaction with. Secondly, it sports a soft in the blood does not harm the process of blood cells. Another reason for this pump is accepted is its simple structure. It does not contain the valve, sealing, packing and gasket. The demolition and re cleaning quick and easy assembly.

 

　　此后，在化学材料制造商巨头像杜邦、道尔、Atofina和其他化学公司的帮助下，新的领域被开拓了。他们在开发用于处理腐蚀化学品：酸、碱、盐、溶剂等的大范围热塑料材料上走在前列。

 

　　Since then, the chemical material manufacturer giants like DuPont, Doyle, Atofina and other chemical company's help, the new field was opened. They used to deal with corrosion in the development of chemicals: wide range of thermoplastic materials acid, alkali, salt, solvent and so on in the forefront.

 

　　前进中的技术

 

　　Advance in technology

 

　　泵的设计者把这些新材料结合到成本-效率泵的设计中来，满足不断扩大的加工工业的需求。今天大约有150000台这种挠性线型泵——总能力为40GPM——在美国使用，而且在欧洲大约有一倍数量的泵在使用。除了需要用这些热塑料旋转螺状泵在低流速到中流速条件下来处理大范围敏感并有腐蚀性的流体外，为了处理化学品、食品、药品和相关工艺和工业企业所要求的更高输送流量，对非金属泵的要求是采用新的结构。泵制造商们回应了这一要求。

 

　　Designer pumps put into these new materials design cost - efficiency of pump in, meet the growing demand for the processing industry. Today there are about 150000 of the flexible linear pump -- total capacity of 40GPM -- used in the United States, and approximately doubled the number of pump in use in europe. In addition to the flow conditions at low flow rates using these thermal plastic rotating spiral pump down to handle a wider range of sensitive and corrosive fluid, in order to deal with the chemical, food, pharmaceutical and related technology and industrial companies are demanding higher transport flow, the non metal pump is a new structure. Pump manufacturers to respond to this request.

 

　　热塑料离心泵设计目前能获得的形式有卧式和立式结构，可用于流量达1500GPM、扬程达400ft，在温度为275°F或者稍高时可以连续或间断使用。他们可以以符合ANSI工艺泵标准的型号布置，可以布置在电磁驱动无密封机构和自动启动装置中。立式泵有干运行的能力，并且有独特的分段轴结构其允许长度为50ft。所有的这些类型都可用于食品工业，因为其设计和结构没有金属组件接触流体。

 

　　Design of thermal plastic centrifugal pumps available in the form of horizontal and vertical structure, can be used for flow rate up to 1500GPM, head of 400ft, at a temperature of 275 ° F or slightly high can be continuous or intermittent use. Layout models they can to comply with the ANSI process pump, can be no sealing mechanism and automatic starting device is arranged in the electromagnetic drive. Vertical pumps have run dry capability, and has the unique structure of the sectional axis the permitted length for 50ft. All of these types can be used in the food industry, because of its design and structure fluid does not contact the metal components.

 

　　典型应用

 

　　Typical applications

 

　　粘稠芥末和清醋

 

　　Viscous mustard and vinegar

 

　　挠性线型螺状旋转泵允许它处理清澈和6000SSU的粘稠流体、淤浆和有小颗粒的均匀流体。在这种装置中，清醋以地面液位储存，然后用泵打入地板上方的一个储罐。然后它因重力流入配料罐，往配料罐中加芥末籽和盐。这些混合配料排入一个搅拌/混合罐，制成的芥末产品被泵打入一个料斗并装入移动着的输送带上的瓶子中。

 

　　Flexible linear shaped rotary pump Lo allow it to deal with the viscous 6000SSU clear and fluid, slurry and small particles have uniform fluid. In this device, clear vinegar to ground level storage, and then use the pump into the top floor of a storage tank. And it is because of gravity flow of ingredients cans, cans of ingredients to add mustard seeds and salt. These mixed ingredients into a mixing / mixing tank, conveyor belt on the bottle made of mustard products are pumped into a hopper and into the moving in.

 

　　August Barer & Sons公司安装的泵要求在50PSI的压力和粘度为5000SSU的条件下能处理的流量为10GPM。只有两个部件接触了腐蚀性流体。它们都是塑料。较厚部分的聚丙烯泵体的寿命是无限的，因为它不与食品发生反应而且其光滑的内部也减少了磨损。合成橡胶挠性衬里也不与食品发生反应但是衬里皱曲会抽去产品的一部分，特别是流体中含有研磨粉时。该公司提供的一份服务报告说，处理清醋的这种泵在其运行的前20年只需要更换一次衬里。尽管处理粘稠芥末的泵要求定期并按计划更换衬里，这种工作可以在现场用几分钟完成，而不需要特殊工具。

 

　　August Barer & Sons, installation of the pump requires 50PSI pressure and viscosity of treatment to 5000SSU under the conditions of flow rate of 10GPM. Only two parts in contact with the corrosive fluid. They are all plastic. The thicker part of the life of polypropylene pump body is infinite, because it does not react with food and its smooth interior also reduces wear and tear. Flexible synthetic rubber lining does not react with food but a part of the song will be lining wrinkle removing product, especially when the fluid contains abrasive powder. A service report provided by the company said, this pump clear vinegar treatment at 20 years ago the only need to replace a liner. Although the pump requires processing viscous mustard regularly and according to plan to replace the lining, this work can be accomplished in a few minutes in the field, without the need for special tools.