A belt guard for an air compressor that includes an air compressor silencer. The guard includes a housing that includes a front cover and a back cover, and an accommodation portion. The air compressor silencer is provided inside the housing in the accommodation portion, where the air compressor silencer includes a spirally shaped silencer core, and the spirally shaped silencer core includes at least one spiral chamber comprising a core inlet and a core outlet. Additionally, a compressor installation that includes a motor, a compressor, a belt connected to a compressor shaft of the compressor element and a motor shaft of the motor, and a belt guard that includes a front cover and a back cover, and an accommodation portion, where the compressor silencer is provided inside the housing in the accommodation portion.

A connecting device includes a substantially cylindrical or tubular body provided, at one of its ends, with an outer perimeter projection and co-operative with a duct of channel of a cylinder cap. The device is preferably producible with steel aluminum alloy, or another metal alloy with similar structural and thermal properties mainly due to the stresses it may suffer during use. The device is configured to be able to absorb tolerance variations and to have a resilience capable of providing resistance at the time when a connection undergoes mechanical stresses of performance, especially torsion.

A rotary compressor includes a compressor housing that is provided with a refrigerant discharge portion and a refrigerant suction portion, and an accumulator that is fixed to the outer peripheral surface of the compressor housing and connected to the suction portion. The accumulator has a cylindrical body portion, which is formed of a resin material, an upper portion, which is formed of a metal material and closes an upper end of the body portion, and a lower portion, which is formed of a metal material and closes a lower end of the body portion, the upper portion is joined to the upper end of the body portion, and the lower portion is joined to the lower end of the body portion.

A silencer comprises a main air guide tube provided with an air guide channel; the main air guide tube comprises an air inlet end and an air outlet end; both ends of an assistant air guide tube are connected with an outer wall of the main air guide tube, and the assistant air guide tube comprises a guide section and a reflux section; the guide section is provided with an air inlet, and the air inlet is communicated with the air guide channel; the reflux section is provided with an air outlet, and the air outlet is communicated with the air guide channel.

A pulsation damper for a condensate pump comprising a housing defining a fluid chamber having a liquid inlet connectable to an outlet of the condensate pump, an air inlet, and a liquid outlet, wherein the air inlet includes a one-way valve configured to selectively introduce air into the housing to maintain a first air pocket within the fluid chamber as liquid flows through the fluid chamber, wherein the liquid outlet is located outside the first air pocket, and wherein the air pocket is configured to dissipate pulsations within liquid entering the housing at the liquid inlet prior to the liquid discharging via the liquid outlet.

A screw compressor having screw rotors for compressing a process gas, a pipe bend conducting compressed process gas towards a silencer. The pipe bend at an inlet-side portion comprises a first connecting piece fastening the pipe bend to a pressure port and on an outlet-side portion a second connecting piece for fastening the pipe bend to the silencer. The pipe bend has a flow channel between the connecting pieces defined by an inner wall and an insert that projects into the inlet-side portion of the pipe bend. An outer wall of the insert projecting into the flow channel of the pipe bend and a portion of the inner wall of the pipe bend enclosing this outer wall on the outside delimit a space acting as resonator, coupled to the flow channel of the pipe bend.

The present invention relates to the technological field of acoustic filters applied to hermetic compressors. Problem to be solved: In hermetic compressors applied in cooling system, 5the work fluid sucked by the compression mechanism is hotter than the work fluid coming from the evaporator, and it is known that greater the temperature of this fluid, smaller is the efficiency of the compressor. Resolution of the problem: It is revealed a suction acoustic filter and a suction line including this acoustic filter capable of guarantee that the compression mechanism works mainly with the work fluid coming from the evaporator, which is colder than the work fluid accumulated inside the environment defined by the hermetic housing of compressor.

Reduction of noise produced by hermetic compressors. The acoustic filter includes an inlet duct, an outlet duct and a main chamber. The inlet duct includes a refrigerant fluid inlet and a refrigerant fluid delivery end. The refrigerant fluid delivery end is opposite to the refrigerant fluid inlet and it is capable of guiding the refrigerant fluid to the main chamber. The outlet duct includes a refrigerant fluid outlet and a refrigerant fluid collection end. The refrigerant fluid collection end is opposite to the refrigerant fluid outlet for guiding the refrigerant fluid from the main chamber to the fluid outlet. The filter includes a resonator chamber arranged adjacent to the inlet duct and adjacent to the main chamber. The resonator chamber and the inlet duct are fluidically connected by a resonator tube and the resonator chamber is separated from the main chamber by a sealing wall.

The present invention belongs to the technological field of compressors for cooling systems and, according to a preferred embodiment of the present invention, the connecting device a substantially cylindrical or tubular body provided, at one of its ends, with an outer perimetral projection and co-operative with a duct or channel of a cylinder cap, wherein, preferably, the device will be produced with steel, aluminum alloy, or other metal alloy with similar structural and thermal properties, mainly due to the stresses it may suffer during use and to be able to absorb the tolerance variations and to have a resilience capable of providing resistance at the time the connection undergoes mechanical stresses of performance—especially torsion.

A pump system (120) has a central pump unit (110), with which at least one hook-up unit (130). The least one hook-up unit (130) is from a group of a plurality of hook-up units (130) that can be combined in modular form for setting an operating point of a pump (10) that forms the pump unit (110). A method uses such a hook-up unit (130) in a pump system (120) for setting an operating point of the pump unit (110) thereof. A medical device is provided with such a pump unit (110) or with such a pump unit (110) and at least one hook-up unit (130) combined with the pump unit (110).