| 释义 |
▪ I. Leblanc1|ləblɑ̃|
Also LeBlanc.
The name of Nicolas Leblanc (1742–1806), French chemist, used attrib. to designate a (now obsolete) process for the manufacture of sodium carbonate in which sodium chloride is treated with hot concentrated sulphuric acid to form the sulphate (‘salt-cake’), which is then heated with limestone and coal and the resulting carbonate dissolved out with water.
[1864Chem. News 5 Mar. 111/1 (heading) Theoretical researches on the preparation of soda by Leblanc's process.] 1880G. Lunge Theoret. & Pract. Treat. Manuf. Sulphuric Acid & Alkali II. iv. 361 (heading) The manufacture of soda by the Leblanc process. 1930J. A. Timm Introd. Chem. xxxiii. 438 During the 75 years which followed, the LeBlanc process grew to be a great industry, spreading to Germany, Austria, and England. 1965D. Abbott Inorg. Chem. iv. 157 Sodium sulphate is manufactured by the first stage of the Leblanc process.
▪ II. Leblanc2 Electr. Engin.|ləblɑ̃|
The name of Maurice Leblanc (1857–1923), French electrical engineer, used attrib. to designate apparatus invented by him, as Leblanc connection, a method of connecting three single-phase transformer windings to convert three-phase current to two-phase; Leblanc exciter or phase advancer, a device for advancing the phase of the rotor current of an induction motor, consisting of a direct-current armature and commutator, having three sets of brushes per pair of poles connected to the slip rings of the main motor, and driven somewhat faster than the main motor.
1924M. Walker Control of Speed & Power Factor of Induction Motors vii. 117 The Leblanc exciter, consisting of an armature built like a continuous current armature and excited by the rotor currents following either the armature itself or in a field magnet surrounding the armature. 1948M. G. Say Performance & Design Alternating Current Machines (ed. 2) v. 68 The Le Blanc connection has the advantage of using a standard three-phase transformer core. 1965J. Hindmarsh Electr. Machines ix. 492 (heading) Leblanc phase advancer. 1966Brosan & Hayden Adv. Electr. Power & Machines vi. 243 In the Leblanc connexion there are three magnetic cores, and the primary windings may be connected in either star or delta. Ibid. x. 476 Another method of power factor control utilizes the Leblanc exciter. 1968A. R. Daniels Performance Electr. Machines v. 97 An alternative method of 3/2 phase conversion is the Leblanc connection. |