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                                                                                                                                        現在位置首頁>實驗耗材配件>實驗室塑料制品>實驗室塑料耗材>多道排槍活塞組件 維修配件 721008
                                                                                                                                        多道排槍活塞組件 維修配件 721008
                                                                                                                                        多道排槍活塞組件 維修配件 721008
                                                                                                                                        • 多道排槍活塞組件 維修配件 721008

                                                                                                                                        多道排槍活塞組件 維修配件 721008

                                                                                                                                        產品報價:詢價

                                                                                                                                        更新時間:2022/3/9 19:53:55

                                                                                                                                        地:上海

                                                                                                                                        牌:其他品牌

                                                                                                                                        號:721008

                                                                                                                                        廠商性質: 1,2,

                                                                                                                                        公司名稱: 上海五云間貿易有限公司

                                                                                                                                        產品關鍵詞: 維修組件   活塞   配件  

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                                                                                                                                        移液器的組成部件

                                                                                                                                        移液器一般由數十個部件組成,多數是塑料部件。對于使用者而言,通常關注幾個容易了解且比較重要的部件:

                                                                                                                                        1、槍體(手握持的部分)。

                                                                                                                                        比較容易理解的是這一部分需要耐腐蝕、耐磨損,而容易被忽視的是這一部分需要很低的熱傳導性:如果手握持移液器的時間較長,有可能通過槍體把手溫傳導到內部的部件上,從而使移液器的內腔溫度升高,氣壓增大,從而影響移液器的精度。這個部件目前基本上都是用塑料,其中比較好的是PVDF(聚偏氟乙烯)。

                                                                                                                                        2、套柄(或稱套筒,指移液器的下半部分,一般為白色塑料)。

                                                                                                                                        除了耐腐蝕外,還需要:其一,耐磨損。套柄的下端需要不斷與吸頭發生摩擦;其二,耐沖擊。在國內,由于大多數情況下用質量較差的吸頭,在裝吸頭時需要用較大的力。為了解決這兩個問題,有的品牌在其套柄的下端甚至整個套柄使用了金屬材質;有的品牌則在設計上下功夫,減少套柄與吸頭的摩擦并減少裝吸頭的用力,這樣對套柄材質的要求就降低了。

                                                                                                                                        3、活塞(位于移液器下半部分的套柄內)。

                                                                                                                                        目前常用的材質有三種:

                                                                                                                                        一是不銹鋼。不銹鋼的機械加工性能較好,容易實現密封,并且強度高,不易變形,能保證非常高的精度,是移液器的普遍選擇。但不銹鋼也有缺點,那就是耐腐蝕性較差。因此,不銹鋼活塞對日常的使用和保養要求較高;

                                                                                                                                        二是塑料。塑料容易成型且成本低廉,低端移液器上使用比較普遍。同時,塑料也有很大的缺點,就是容易變形,很難保持較高的密封性,從而降低了移液器的精度。

                                                                                                                                        三是陶瓷。陶瓷的突出特點是耐腐蝕,但加工較困難,活塞表面無法做到象不銹鋼那樣平滑,因此要保持密封離不開潤滑劑的幫助。并且,如果用作小量程移液器的活塞,由于直徑過小,機械強度會較差;除了以上兩種,市場上還有一些特殊的材質: 比如玻璃。玻璃耐腐蝕且表面平滑,但表面不耐磨,容易出現劃痕,且損壞后極難修復??傮w上來說,不銹鋼活塞的精度高,塑料活塞的低。

                                                                                                                                        4、密封圈(安裝于活塞上)。

                                                                                                                                        因為密封圈可能會受到各種化學介質的“攻擊”,且對密封性的影響很大,需要保持較長的青春,所以好是用PTFE(聚四氟乙烯)等耐腐蝕、不易變形的材質。


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