A vibration damping connector system to connect between a vacuum chamber and a vacuum pump such that the vacuum pump is supported by the vibration damping connector system includes a first cylindrical member and a second cylindrical member that provide a flow passage through which gas can flow from the vacuum chamber to the vacuum pump. At least one sealing member is disposed intermediate the first and second cylindrical members to provide a gas seal and a securing system securely connect the first and second cylindrical members. At least one resilient member disposed intermediate the securing system and a cylindrical member so that when the at least one sealing member is compressed by a pressure reduction caused in use by operation of the vacuum pump, the at least one resilient member can expand to enable the securing system to maintain a secure connection.

Methods, apparatus, systems and articles of manufacture are disclosed. A split shroud for an inner shroud of a gas turbine engine includes: at least one forward shroud segment and at least one aft shroud segment to couple to the at least one forward shroud segment, the at least one forward shroud segment and the at least one aft shroud segment forming a split line.

A centrifugal fan assembly including fan wheel, a primary inlet bell, a secondary inlet bell, and a flow grid. The primary inlet bell and secondary inlet bell direct air into an inlet of the fan wheel of the centrifugal fan. Also disclosed is a sound reduction assembly for reducing the sound produced by a centrifugal fan or centrifugal compressor. A method of directing air flowing into a centrifugal fan or a centrifugal compressor is also disclosed.

A turbofan engine according to an example of the present disclosure includes, among other things, a fan, and an outer housing surrounding the fan to define a bypass flow path, a compressor, a turbine section including a fan drive turbine and a second turbine, an epicyclic gear system with a gear reduction, the fan drive turbine driving the fan through the gear system, and the gear system straddle-mounted by first and second bearings. The fan drive turbine has a first exit area at a first exit point and is rotatable at a first speed. The second turbine has a second exit area at a second exit point and is rotatable at a second speed. A first performance quantity is defined as the product of the first speed squared and the first area. A second performance quantity is defined as the product of the second speed squared and the second area.

A fan cowling assembly for mounting to a working machine, the fan cowling assembly including: a support for mounting to a working machine, the support defining an opening for receiving a plurality of rotatable blades of a fan, in use; a fan ring mounted to the support by a ring mounting arrangement, the fan ring being arranged to surround the plurality of rotatable blades, in use; wherein the ring mounting arrangement is configured such that the fan ring is moveable relative to the support when mounted thereto.

An energy dissipating damper includes a first end portion configured to be coupled to a first structure, a second end portion, opposite the first end portion, configured to contact a second structure, and a body portion extending from the first end portion to the second end portion. The body portion includes a plurality leaves. The plurality of leaves may be fixed together at the first end portion and may be separable from each other at the second end portion. In response to the energy dissipating damper being in a loaded state, the plurality of leaves may be in direct contact with each at the second end portion. The energy dissipating damper may further include a contact element coupled to the second end portion, and the contact element may comprise an abradable material.

A fan blade unit and a fan impeller structure thereof. The fan blade unit includes a main body having a root section and an end section. The root section is connected with a hub. The end section extends in a radial direction away from the hub. The end section defines a first direction and a second direction. Multiple protrusion bodies are disposed at the end section and at least one channel is formed between the protrusion bodies. The channel extends in the first direction. The fan blade unit is applied to the fan impeller structure. When the fan impeller rotates, a high-pressure area is created between the channel and the wall of the outer frame of the fan, whereby the airflow is restrained from turning over from the lower wing face to the upper wing face to generate wingtip vortex.

An enclosure for a turbomachine includes a turbomachine drive shaft rotating about a longitudinal axis (X) by means of two roller bearings, an upstream bearing and a downstream bearing, each having an inner ring carried by the drive shaft. The two bearings share a single integral outer ring that has an upstream end and a downstream end connected to one another by a section of studs. The single outer ring is carried by an upstream base plate and a downstream base plate of a bearing support configured to be attached to a stationary structure of the turbomachine.

An assembling structure of a ceiling fan has a motor shaft and a driving assembly mounted on the motor shaft. The motor shaft is mounted through the driving assembly. The driving assembly has an upper cover, a lower cover, a chamber, a circuit board, and a positioning mechanism. The lower cover has a covering board and a mounting cylinder mounted in a center of the covering board, and is mounted on the motor shaft via the mounting cylinder. The chamber is formed between the upper cover and the lower cover. The circuit board is mounted in the chamber. The upper cover, the lower cover, and the circuit board are sequentially arranged from top to bottom. The positioning mechanism is mounted in the chamber and limits a mounting position of the circuit board. The present invention solves the noise issue.

A housing defines a housing interior. An air pump is within the housing interior. A first set of dampers supports the air pump within the housing. The first set of dampers at least partially isolates vibration of the air pump from the housing. A second set of dampers is configured to at least partially isolate vibration of the air pump from the housing. The second set of dampers arranged in series with the first set of dampers.