摘要:
Sound damping apparatus for internal combustion engines, especially for public works or agricultural machines, and machines provided with such an apparatus.This sound damping device is intended for machines or engines mounted within a bonnet (1) and provided with a blower (3) discharging cooling air to the outside through a radiator (4). It is constituted by a sound damping element (9, 21) such as a block of expanded foam material having one or more central openings (14) oriented in the direction of flow of the air discharged by the blower and peripheral openings (16) inclined or specially shaped so as to direct the air towards the central flow passing through the central opening or openings downstream of the device. Means are provided for forming an expansion chamber (13) between the radiator and the sound damping element. There is produced as a result of this inclination a jet effect exerted by the lateral air on the central flow which produces the aspiration of a fraction of the said lateral air towards the center in the expansion chamber and a reduction of the noise level.
摘要:
A calendar mechanism for a timepiece having indicators for the day of the month and for the day of the week, in which the indicators are held in each position by a locking lever pivotally mounted for movement between operative and inoperative position with respect to the indicators. The locking lever has two integral arms, one cooperating with each of the indicators for locking and releasing them. The driving member which indexes the indicators once every twenty-four hours is provided with means for urging the locking lever into its operative position at all times except when the indicators are being indexed to new positions, so that the indicators remain in place when they are not being driven but can be independently reset at any time.
摘要:
A system for injecting a mixture of air and fuel into a turbomachine combustion chamber is disclosed. The system includes a fuel injector and a Venturi with an interior surface delimiting a premixing chamber. The Venturi includes an internal annular airflow cavity which is connected by air outlet ducts to the premixing chamber. The air outlet ducts open onto the interior surface of the Venturi so as to prevent to deposition of soot and the formation of coke on this surface.
摘要:
An annular combustion chamber of a turbomachine is disclosed. The combustion chamber includes two walls of revolution each having an annular groove extending around the longitudinal axis of the chamber and opening out inside the chamber. The groove has in cross section a substantially U or V shape that is splayed towards the downstream end and has lateral annular surfaces that are inclined with respect to the area of the wall at which the groove is situated.
摘要:
An igniter plug arrangement is disclosed. The arrangement includes an igniter plug of the semiconductor in shell type, a duct secured to a combustion chamber of a gas turbine engine, a floating sleeve via which the igniter plug is mounted in the duct, and a system for guiding air to cool the semiconductor of the igniter plug. The shell and the semiconductor define, at their combustion-chamber end, an annular igniter plug cavity. The shell includes orifices in the region of the igniter plug annular cavity that communicate with the annular cavity of the sleeve and orifices on its planar surface.
摘要:
According to one aspect, a hockey stick for training a person in stick handling, including an elongate upper stick portion configured to be gripped by a control hand of the person, an elongate lower stick portion rigidly coupled to the upper stick portion and configured to rotate therewith, and an elongate middle stick portion positioned between and collinear with the upper stick portion and the lower stick portion and configured to be gripped by a directional hand of the person. The middle stick portion is rotatably coupled to the elongate coupling member so that rotation of the upper stick portion causes the lower stick portion and the blade member to rotate without rotating the middle stick portion gripped by the directional hand. The hockey stick may include at least one locking mechanism coupled to the middle stick portion and at least one of the upper and lower stick portions. Each locking mechanism is movable between an unlocked position wherein the middle stick portion is rotatable relative to the upper stick portion and the lower stick portion, and a locked position wherein the upper stick portion, the lower stick portion and the middle stick portion are secured together so that rotation of the middle stick portion with respect to the upper and lower stick portions is inhibited.
摘要:
A hockey stick for training a person in stick handling, having elongate upper stick portion, an elongate lower stick portion, an elongate coupling member, and an elongate middle stick portion. The elongate upper stick portion is configured to be gripped by a control hand of the person. The elongate lower stick portion has a blade member extending outwardly therefrom. The elongate coupling member rigidly couples the upper stick portion to the lower stick portion. The elongate middle stick portion is positioned between and collinear with the upper stick portion and the lower stick portion and is configured to be gripped by a directional hand of the person. The middle stick portion is rotatably coupled to the elongate coupling member so that rotation of the upper stick portion causes the lower stick portion and the blade member to rotate without rotating the middle stick portion gripped by the directional hand.
摘要:
A fuel injector for a gas turbine engine combustion chamber is disclosed. The fuel injector includes a first fuel supply line for running at idle speed, a second, main, fuel supply line for running at speeds up to full throttle, and first and second injection orifices with which the two fuel supply lines respectively communicate. The injection orifices are arranged in a ring and the first orifices occupy a sector of the ring.
摘要:
The invention relates to a method of manufacturing (100) a multilayer structure on a support, the said structure comprising n elemental active layers of material, n being an integer greater than or equal to two, the method comprising at least the following steps: a step of depositing (200) a first elemental active layer of material, a step of depositing (300) an nth elemental active layer of material, characterized in that the method includes a single step of implanting ionic species (600) on the n elemental active layers of material deposited, through a resist, which is appropriate for modifying respective properties of each of the n elemental active layers in order to obtain a multilayer structure having controlled properties.
摘要:
A hockey stick for training a person in stick handling, having elongate upper stick portion, an elongate lower stick portion, an elongate coupling member, and an elongate middle stick portion. The elongate upper stick portion is configured to be gripped by a control hand of the person. The elongate lower stick portion has a blade member extending outwardly therefrom. The elongate coupling member rigidly couples the upper stick portion to the lower stick portion. The elongate middle stick portion is positioned between and collinear with the upper stick portion and the lower stick portion and is configured to be gripped by a directional hand of the person. The middle stick portion is rotatably coupled to the elongate coupling member so that rotation of the upper stick portion causes the lower stick portion and the blade member to rotate without rotating the middle stick portion gripped by the directional hand.