{"id":1745,"date":"2017-07-27T14:55:26","date_gmt":"2017-07-27T19:55:26","guid":{"rendered":"http:\/\/www.IpsenHarold.com\/?p=1745"},"modified":"2026-03-11T17:34:54","modified_gmt":"2026-03-11T17:34:54","slug":"diffusion-pumps-backstreaming","status":"publish","type":"knowledge-center","link":"https:\/\/ipsenglobal.com\/de\/knowledge-center\/diffusion-pumps-backstreaming\/","title":{"rendered":"Fragen Sie den Experten: Wie verhindere ich das R\u00fcckstr\u00f6men meiner Diffusionspumpe?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Wenn Sie an h\u00e4ufige Wartungsprobleme denken, die Ihren Vakuumofen und Ihr Pumpsystem betreffen, ist R\u00fcckstr\u00f6mung eines der h\u00e4ufigsten Probleme bei Diffusionspumpen.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/ipsenglobal.com\/wp-content\/uploads\/2022\/03\/mikros-113.jpg\" alt=\"Ipsen vacuum furnace diffusion pump\" class=\"wp-image-3589\" srcset=\"https:\/\/ipsenglobal.com\/wp-content\/uploads\/2022\/03\/mikros-113.jpg 1024w, https:\/\/ipsenglobal.com\/wp-content\/uploads\/2022\/03\/mikros-113-300x169.jpg 300w, https:\/\/ipsenglobal.com\/wp-content\/uploads\/2022\/03\/mikros-113-768x432.jpg 768w, https:\/\/ipsenglobal.com\/wp-content\/uploads\/2022\/03\/mikros-113-18x10.jpg 18w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Bei allen Diffusionspumpen kommt es zu einer geringen R\u00fcckstr\u00f6mung. W\u00e4hrend dies f\u00fcr viele Anwendungen akzeptabel ist, muss bei kritischeren Anwendungen ein Ablenkblech installiert werden, um zu verhindern, dass Partikel die Diffusionspumpe verlassen und in den Hauptprozess gelangen. Die Verwendung einer unterk\u00fchlten K\u00fchlfalle zwischen der Diffusionspumpe und dem Hauptventil kann die F\u00e4higkeit des \u00d6ls, in den Ofen zur\u00fcckzuflie\u00dfen, erheblich reduzieren.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Was ist Backstreaming?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Das Pumpsystem ist so ausgelegt, dass es in eine bestimmte Richtung pumpt. Backstreaming tritt auf, wenn das F\u00f6rdermedium entgegen der gew\u00fcnschten Richtung flie\u00dft. Dies f\u00fchrt dazu, dass das F\u00f6rdermedium in die Kammer des Vakuumofens eintritt, anstatt in der gew\u00fcnschten Str\u00f6mungsrichtung zur\u00fcck in die Basis der Pumpe zu flie\u00dfen, wo es zur\u00fcckgef\u00fchrt wird. Wenn der Druck in der Kammer weiter ansteigt (nach dem Crossover), hat die Fl\u00fcssigkeit, die sich noch im \u00dcbergang befindet, ein h\u00f6heres Potenzial, \u00fcber den Druckunterschied in den Beh\u00e4lter gezogen zu werden.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Welche Probleme kann Backstreaming verursachen?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Eine R\u00fcckstr\u00f6mung kann zu einer Verunreinigung der hei\u00dfen Zone oder der Teile f\u00fchren. Das \u00d6l kann auch in das L\u00f6tmaterial gelangen, was zu einer schlechten L\u00f6tung und Verbindung f\u00fchrt. Die R\u00fcckstr\u00f6mung kann auch das gesamte Pumpensystem betreffen, nicht nur die Pumpen selbst.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Was sind m\u00f6gliche Ursachen f\u00fcr Backstreaming?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Abnormaler \u00dcbergang ins Hochvakuum - der normale \u00dcbergang betr\u00e4gt 80 Mikrometer oder weniger.<\/li>\n\n\n\n<li>Betrieb oberhalb von einem Mikron \u00fcber einen l\u00e4ngeren Zeitraum<\/li>\n\n\n\n<li>Niedriger oder hoher \u00d6lstand<\/li>\n\n\n\n<li>\u00dcberhitzte Diffusionspumpe - die ideale Wassertemperatur sollte 60-80 \u00b0F (16-27 \u00b0C) betragen; die maximale Wasseraustrittstemperatur betr\u00e4gt 125 \u00b0F (52 \u00b0C). Ursachen f\u00fcr \u00dcberhitzung sind unter anderem:\n<ul class=\"wp-block-list\">\n<li>Geringer oder kein Wasserdurchfluss<\/li>\n\n\n\n<li>Zu hei\u00dfes Wasser im Zulauf (\u00fcber 90 \u00b0F \/ 32 \u00b0C)<\/li>\n\n\n\n<li>Lecks in der Diffusionspumpe oder im Kreislauf der Haltepumpe<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Geringe W\u00e4rmezufuhr zur Diffusionspumpe, verursacht durch:\n<ul class=\"wp-block-list\">\n<li>Defekte Heizger\u00e4te<\/li>\n\n\n\n<li>Durchgebrannte Sicherungen oder unterbrochene Dr\u00e4hte<\/li>\n\n\n\n<li>Zu viel \u00d6l<\/li>\n\n\n\n<li>\u00dcberm\u00e4\u00dfige Wassermenge<\/li>\n\n\n\n<li>Wassertemperatur zu niedrig<\/li>\n\n\n\n<li>Falsche oder unsachgem\u00e4\u00df verdrahtete Ersatzheizger\u00e4te<\/li>\n\n\n\n<li>Thermoelement der Diffusionspumpe, das kalter Luft ausgesetzt ist<\/li>\n\n\n\n<li>Auff\u00fcllen der Kammer, bevor das Hauptventil vollst\u00e4ndig geschlossen ist<\/li>\n\n\n\n<li>Schlecht arbeitende oder unterdimensionierte Vorvakuumpumpe<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Wechsel des Herstellers der verwendeten Pumpfl\u00fcssigkeit. Dies kann die Betriebstemperatur beeinflussen, so dass sie zu hei\u00df oder zu kalt wird.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>Anmerkung:<\/strong> Verwenden Sie f\u00fcr den Anschluss von Heizger\u00e4ten keine Kupferdr\u00e4hte oder -kabelschuhe, da diese oxidieren und ausfallen k\u00f6nnen. Verwenden Sie nur Nickeldr\u00e4hte und Kabelschuhe. Als kurzfristige L\u00f6sung k\u00f6nnen auch Kabelschuhe aus rostfreiem Stahl verwendet werden.<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">Weitere hilfreiche Tipps finden Sie in unserem&nbsp;<a href=\"https:\/\/ipsenglobal.com\/de\/category\/ask-the-expert\/\" target=\"_blank\" rel=\"noreferrer noopener\">Frag den Experten Seite<\/a>.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Haben Sie eine technische Frage zur W\u00e4rmebehandlung oder zum Betrieb und zur Wartung von Vakuum\u00f6fen?<\/h5>\n\n\n\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n    <section id=\"button-block_df8aa6cba4d17355f16832e713a64f98\"\n        class=\"button-custom-block d-block d-lg-inline-block mx-auto me-lg-5 mb-4\">\n        <a class=\"btn btn-outline-secondary\" href=\"https:\/\/ipsenglobal.com\/de\/connect-with-an-expert\/\" target=\"_blank\">\n            Verbindung mit einem Ipsen-Experten        <\/a>\n    <\/section>","protected":false},"excerpt":{"rendered":"<p>Wenn Sie an h\u00e4ufige Wartungsprobleme denken, die Ihren Vakuumofen und Ihr Pumpsystem betreffen, ist R\u00fcckstr\u00f6mung eines der am h\u00e4ufigsten genannten Probleme bei Diffusionspumpen. Eine geringe Menge an R\u00fcckstr\u00f6mung<\/p>","protected":false},"author":7,"featured_media":1746,"menu_order":0,"template":"","meta":{"_acf_changed":false,"_tec_requires_first_save":true,"_searchwp_excluded":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_description":"","_tribe_blocks_recurrence_exclusions":"","_ecp_custom_2":"","footnotes":""},"categories":[112,612,654],"tags":[469,135,472,75],"class_list":["post-1745","knowledge-center","type-knowledge-center","status-publish","has-post-thumbnail","hentry","category-ask-the-expert","category-preventive-maintenance","category-pumping-systems","tag-backstreaming","tag-brazing","tag-diffusion-pump","tag-vacuum-furnace"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ask the Expert: How do I Prevent my Diffusion Pump from Backstreaming?<\/title>\n<meta name=\"description\" content=\"Backstreaming is one of the more-reported problems with diffusion pumps. 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