Exhauster

Community and Forum → Entomological collections → Exhauster

Pirx, 04.11.2007 19:47

An exhausteris a must — have item. At the same time, there are a million of its designs. In the summer I lost my old exhauster (glass, aluminum tubes, Soviet rubber-antique, in general). More precisely, it was stolen by some native, seduced, apparently, by the frankly bulbul appearance of the device. Therefore, the task of creating a new suction device for the next field season has become urgent. In the beginning, I encountered a problem with pipes. Previously, droppers (blood transfusion systems) with sufficiently wide tubes were sold, but now the standard has changed and the tubes are no longer suitable. The old dropper could not be obtained. While I was thinking, I accidentally discovered a large variety of quite suitable silicone transparent tubes of different diameters on the construction market. They are sold in meters, the price of a meter is slightly less than 1 cu. I also planned the capacity for the exhauster. It should serve as a blank for an ordinary plastic bottle. At one time, entomologists from Krasnodar showed me such exhusters and even gave me several blanks with an ordinary neck and a wide one. while I was thinking about the final version of the design, again by chance in a construction store I found an interesting piece for 2 cu., which is easy to convert into two exhusters. This is the building level (see photo).

It consists of two blanks for plastic bottles, a silicone tube of various lengths (I have -3 meters) and two blue bushings. Blanks have a spout in the cork, which is used in the level for free air penetration, and in the finished bottle — for drinking without opening the cork ("sports" version). A hole is drilled in the bottom of the blanks. The bushing has a hole. The sleeve is inserted into one end of the tube, the other end of which is passed all the way into the hole in the bottom of the workpiece. After that, with a couple of movements, the sleeve is finally fixed, bursting the tube in the hole.

Ecgauster from this level is made elementary. When screwing the plug, a piece of gauze, mill gas, or similar material folded a couple of times is inserted into it; the yellow plug is removed completely (the plug under it has a protrusion in the form of a tube). We catch it by sucking in air from the side of the traffic jam. The level allows you to create two devices plus you become the happy owner of extra scraps of silicone tubes.

Advantages of the device: efficiency and low cost of manufacturing, simplicity of design.

Disadvantages of the device: with this design, the narrow (literally) place is the diameter of the hole of the blue sleeve, which is smaller than the diameter of the silicone tube, which reduces the "sucking" force and narrows the range of sizes of sucked organisms.

Therefore, I would like to ask the forum members — will anyone suggest an alternative effective fastening of the tube in the bottom of the workpiece without a sleeve, i.e. without narrowing the insect-conducting paths?

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