| dbo:abstract |
In hydraulic systems, a fuse (or velocity fuse) is a component which prevents the sudden loss of hydraulic fluid pressure. It is a safety feature, designed to allow systems to continue operating, or at least to not fail catastrophically, in the event of a system breach. It does this by stopping or greatly restricting the flow of hydraulic fluid through the fuse if the flow exceeds a threshold. The term "fuse" is used here in analogy with electrical fuses which perform a similar function. Hydraulic systems rely on high pressures (usually over 7000 kPa) to work properly. If a hydraulic system loses fluid pressure, such as due to a burst hydraulic hose, it will become inoperative and components such as actuators may collapse. This is an undesirable condition in life-critical systems such as aircraft or heavy machinery, such as forklifts. Hydraulic fuses help guard against catastrophic failure of a hydraulic system by automatically isolating the defective branch. When a hydraulic system is damaged, there is generally a rapid flow of hydraulic fluid towards the breach. Most hydraulic fuses detect this flow and seal themselves (or restrict flow) if the flow exceeds a predetermined limit. There are many different fuse designs but most involve a passive spring-controlled mechanism which closes when the pressure differential across the fuse becomes excessive. Many gas station pumps are equipped with a velocity fuse to limit gasoline flow. The fuse can be heard to engage with a "click" on some pumps if the nozzle trigger is depressed fully. A slight reduction in fuel flow can be observed. The fuse resets instantly upon releasing the trigger. (en) 液壓系統中的保險器（或速度保險器）是指可避免系統的液體壓力突然減少的設備。保險器有安全特性，即使系統受到破坏的情况，也可以讓系統繼續運作，或是至少不會出現災難性的失效。其原理是在若流量超過一限制值時，不讓液體從保險器流過，或是大幅限制液體的流動。 保險器的英文也是fuse，類比保險絲在電流過大時形成斷線的類似特性。 液壓系統需要高壓（一般會超過7000 kPa）才能正常運作。若液壓系統的液壓消失（例如液压软管破裂），會無法運作，像致動器之類的元件會崩溃。若是像飛機等生命關鍵系統或是像叉車之類的重型機械，不希望有這様的情形出現。液壓保險器可以自動隔離損壞的支路，避免液壓系統的災難性失效。 若液壓系統受損，會有大流量的液壓液體往破裂處流動。大部份的液壓保險器會在流量超過一預定值時偵測到此一情形，將其本身密封（或限制流量）。有許多不同的液壓保險器設計方式，但大部份都有被動式的彈簧控制機制，若保險器兩端的壓差過大，自動關閉流體通路。 許多加油站泵（例如）都有速度保險器以限制汽油的流量。若速度保險器動作，其油的流量會略為減少。若觸發信號移除，即可完全的重置保險器。 (zh) |
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| rdfs:comment |
液壓系統中的保險器（或速度保險器）是指可避免系統的液體壓力突然減少的設備。保險器有安全特性，即使系統受到破坏的情况，也可以讓系統繼續運作，或是至少不會出現災難性的失效。其原理是在若流量超過一限制值時，不讓液體從保險器流過，或是大幅限制液體的流動。 保險器的英文也是fuse，類比保險絲在電流過大時形成斷線的類似特性。 液壓系統需要高壓（一般會超過7000 kPa）才能正常運作。若液壓系統的液壓消失（例如液压软管破裂），會無法運作，像致動器之類的元件會崩溃。若是像飛機等生命關鍵系統或是像叉車之類的重型機械，不希望有這様的情形出現。液壓保險器可以自動隔離損壞的支路，避免液壓系統的災難性失效。 若液壓系統受損，會有大流量的液壓液體往破裂處流動。大部份的液壓保險器會在流量超過一預定值時偵測到此一情形，將其本身密封（或限制流量）。有許多不同的液壓保險器設計方式，但大部份都有被動式的彈簧控制機制，若保險器兩端的壓差過大，自動關閉流體通路。 許多加油站泵（例如）都有速度保險器以限制汽油的流量。若速度保險器動作，其油的流量會略為減少。若觸發信號移除，即可完全的重置保險器。 (zh) In hydraulic systems, a fuse (or velocity fuse) is a component which prevents the sudden loss of hydraulic fluid pressure. It is a safety feature, designed to allow systems to continue operating, or at least to not fail catastrophically, in the event of a system breach. It does this by stopping or greatly restricting the flow of hydraulic fluid through the fuse if the flow exceeds a threshold. The term "fuse" is used here in analogy with electrical fuses which perform a similar function. (en) |
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Fuse (hydraulic) (en) 液壓保險器 (zh) |
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