Ventilation in mines by Wabner Robert & Salter Charles

Author:Wabner, Robert & Salter, Charles
Language: eng
Format: epub
Tags: Mine ventilation
Publisher: London : Scott, Greenwood & Co. ; New York : D. Van Nostrand Co; [etc., etc.]
Published: 1903-03-25T05:00:00+00:00

CHAPTEK VII.

VENTILATORS AND FANS.

VENTILATING machines with variable internal capacity, and working by the rectilinear movement of a bell or plunger.

145. THE HARZ VENTILATOR (Fig. 77).

The Harz ventilator is a machine that has long been used in the Harz mountain ore mines. It consists of a fixed chest K of circular section (seldom rectangular), open at the top, and traversed at the bottom by an air pipe t, communicating with the workings to be ventilated. The mouth of the pipe t is fitted with a suction valve c, opening upwards. The vessel P is partly filled with water to form a seal, and into this dips a bell B which can be raised and Jowered by a piece of mechanism T, which is usually a pump rod. The bell is open below, and is provided in the top with a second valve c 1 , also opening upwards. When the bell is raised the rarefaction of the air inside causes the valve c to open, c 1 remaining closed, and air flows upwards through the pipe t. On the descent of the bell the air underneath is compressed, closing the valve c, whilst c 1 is forced open and allows the imprisoned air to escape. In the position shown in Fig. 77 the arrangement of the valves is such that the apparatus acts by suction, but it may be easily modified so as to work by propulsion. Fairly high pressures can be obtained with this apparatus, and a considerable pit resistance can be overcome ; consequently it may be used for ventilating long cross drivages, drainage galleries, etc. —a circumstance indicating its employment in cases where compressed air, hydraulic power, or some other cheap source of motive power, is not available. However, the volume of air supplied by this apparatus is somewhat limited, since the bell can scarcely exceed 40 inches in diameter, the stroke 80 inches, or the speed 5 to 6 strokes per minute.

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