Abstract: An attenuating apparatus for use with a positive displacement compressor. The device includes a bore formed in a housing of the compressor, the bore being positioned at an angle to a discharge chamber of the compressor and in fluid communication with the compressor discharge chamber. A plug is positioned within the bore, the plug movable within the bore to a preselected position. The plug has a first end in contact with a gas from the compressor discharge chamber and a second, opposite end being accessible from an exterior of the housing. A seal is positioned between the plug and the bore to seal an interface between the plug and the bore to prevent leakage of a gas from the compressor discharge chamber along the interface. The plug is lockable within the bore at the preselected position.

Abstract: A stagnation space defined by barriers is provided in a first muffler chamber communicating with a first cylinder chamber. The stagnation space overlaps with a refrigerant-gas inlet side of the first cylinder chamber, the inlet side being bordered by a center plane as viewed in a direction of a center axis of the first cylinder chamber. In the first muffler chamber, the high-temperature, high-pressure refrigerant gas is unlikely to enter into the stagnation space, so that heat is less absorbed to the inlet side of the first cylinder chamber.

Abstract: A blower assembly including a motor, an impeller and a volute that is configured such that an inlet chamber of the volute and an outlet chamber of the volute are divided from one another by an airtight membrane and the membrane is configured to allow the transmission of pressure waves between the inlet and outlet chambers.

Abstract: A muffler for a positive displacement pneumatic motor includes a case, an inlet, a diffuser, a pathway, and sound absorbing material. The inlet and the diffuser are attached to the case. The pathway extends between the inlet and the diffuser and allows ice to travel through the muffler. The sound absorbing material is positioned in the pathway and includes more than one duct through which gas passes.

Abstract: A linear compressor is provided that includes a shell; a fixed member installed inside the shell, and including a cylinder that provides a compression space for a refrigerant introduced into the shell; a moving member including a piston that compresses the refrigerant sucked into the compression space inside the cylinder, and that is linearly reciprocated with respect to the fixed member; and a suction muffler positioned on or in a suction passage of the refrigerant inside the shell. A suction volume with a larger sectional area in a central portion than in both ends is defined in the suction muffler.

Abstract: An attenuating apparatus for use with a positive displacement compressor. The device includes a bore formed in a housing of the compressor, the bore being positioned at an angle to a discharge chamber of the compressor and in fluid communication with the compressor discharge chamber. A plug is positioned within the bore, the plug movable within the bore to a preselected position. The plug has a first end in contact with a gas from the compressor discharge chamber and a second, opposite end being accessible from an exterior of the housing. A seal is positioned between the plug and the bore to seal an interface between the plug and the bore to prevent leakage of a gas from the compressor discharge chamber along the interface. The plug is lockable within the bore at the preselected position.

Abstract: A compressor has first and second enmeshed rotors rotating about first and second axes to pump refrigerant to a discharge plenum. The compressor includes a muffler system comprising a sound absorbing first element and a sound absorbing second element. The second element at least partially surrounds the first element and defines a generally annular flow path portion between the first element and the second element At least one of the first and second elements comprises an expanded bead material.

Abstract: A compression element is provided with a block, a piston, a valve plate arranged in an opening end of a compression chamber and forming a suction hole, a suction valve, a suction muffler forming a sound absorbing space and provided with a communication pipe, and a cylinder head, the communication pipe has a suction muffler outlet portion communicated with the suction hole, is arranged in such a manner as to extend in a vertical direction with respect to a center line passing through the suction hole, and is arranged in such a manner that a part of the suction muffler outlet portion covers a part of the suction hole in the suction muffler outlet portion positioned in a downstream side of refrigerant gas flowing through the communication pipe, in the case of projection the suction muffler outlet portion in a direction of a center line.

Abstract: A controlled-clearance sealing compressor device that provides precision rotor centering directly with respect to the stator housing, vane centering with respect to rotor (not the stator) and the dynamic balance design of the gliders required for practical single and dual vane devices. The devices uses roller bearings to control the radial position of the vane and control rods or pins are used to control axial positioning of the vane, its ‘centralization’ with respect to the rotor and the endplates. The positive displacement rotary vane compressors and vacuum pumps have friction reduction, efficiency enhancement and exceedingly long operating life as a result of the non-contact gas sealing of the process gas within the rotary vane compressors and vacuum pumps. In an embodiment the positive displacement compressing device is used in transportation vehicles.

Abstract: An airflow assembly, includes a plenum, a barrel, a fan support, a fan assembly, and a plurality of ribs. The plenum includes an opening structure defining a plenum opening. The barrel extends in a downstream direction from the opening structure, and defines a barrel space and a downstream edge. The fan support is at least partially positioned within the barrel space. The fan assembly is supported by the fan support and includes (i) a motor and (ii) a blade assembly configured to rotate about an axis. Each of the ribs extends between (i) the opening structure or the barrel and (ii) the fan support. The downstream direction is parallel to the axis. An upstream direction is opposite of the downstream direction and parallel to the axis. A plane intersects the axis and is perpendicular to the axis.

Abstract: A refrigerant compressor that includes a compressor housing enclosing an outlet chamber and an outlet passage leading from the outlet chamber to an external high pressure connection, such that the pulsations in it are damped as much as possible. The refrigerant compressor includes a pulsation damping element inserted into the outlet passage of the compressor housing following the outlet chamber. The pulsation damping element has an inlet baffle which faces the outlet chamber and extends over a cross section of the outlet passage and, located opposite to the inlet baffle is an outlet baffle which extends over the cross section of the outlet passage. At least one reflection chamber is provided between the inlet baffle and the outlet baffle. The inlet baffle and the outlet baffle each have at least one passage which faces a reflection surface on the respectively other baffle.

Abstract: A linear compressor is provided that includes a stationary member including a cylinder that provides a space to compress a refrigerant; a movable member that linearly reciprocates with respect to the stationary member, and that includes a piston that compresses the refrigerant inside the cylinder and a supporter piston having a support portion that extends in a radial direction of the piston; front main springs positioned so as to be symmetrical with respect to centers of the piston and the supporter piston, one ends of which are supported by a front surface of the support portion of the supporter piston and the other ends of which are supported by the stationary member; a rear main spring, one end of which is supported by a back surface of the supporter piston; a suction muffler that provides a passage to introduce the refrigerant while reciprocating with the movable member, reduces noise, and includes an extended part that extends toward the supporter piston; and a spring guide fixed to the supporter piston

Abstract: A dynamic variable compression ring for use in submersible pumps. where the variable compression ring compensates for metal compression ring measurement errors during assembly. The dynamic variable compression ring also allows for thermal heating of the internal pump components, thus maintaining the desired diffuser compression values.

Abstract: An inlet plenum for a compressor that suppresses acoustic shock waves generated by the compressor, which inlet plenum has an inlet duct with a wall that surrounds an air flow path between a mouth of the inlet plenum and the compressor, comprises: at least one cavity that penetrates an inner surface of the wall, circumscribes the inner surface generally transversely to the air flow path and has a position along the air flow path that is generally coincident with at least one constructive interference peak of the acoustic shock waves along the inner surface; a width of the cavity along the direction of the air flow that is less than or equal to the wavelength of at least one of the acoustic shock waves; and a depth of the cavity generally perpendicular to the direction of the air flow that approximates a multiple of a quarter wavelength of at least one of the acoustic shock waves.

Abstract: A sealed compressor according to the present invention comprises an electric element; a compression element; a sealed container; and a suction pipe. The compression element includes a compression chamber, a piston provided inside of the compression chamber, and a suction muffler communicating with the inside of the sealed container and the compression chamber. The suction muffler is laid out such that an opening portion thereof at the sealed container side faces an opening portion of the suction pipe at the sealed container side. The suction muffler includes: a hood section provided in the vicinity of the opening portion of the suction muffler to extend toward the inside of the sealed container, the hood section being configured to collect cooling medium gas discharged from the suction pipe; and an auxiliary hood fastened to the hood section and formed in a manner to increase a collection area of the hood section.

Abstract: A rotary compressor includes a rotation compression element, a discharge port and a muffler. The rotation compression element is configured to compress gas as a result of rotation of a crankshaft about a rotation axis. The discharge port is configured to discharge the gas compressed by the rotation compression element. The muffler is arranged to cover the discharge port and surround the crankshaft. The muffler has a muffler crankshaft hole through which the crankshaft passes, and a muffler discharge region configured to discharge the compressed gas discharged from the discharge port toward an outer surface of the crankshaft.

Abstract: A muffler for a compressor has a chamber between an inlet and an outlet and a communicating pipe for indirectly connecting the inlet to the outlet, whereby a suction loss of a refrigerant sucked into the muffler for the compressor can be reduced and also pressure pulsation can be reduced so as to enhance a cooling capability of the compressor and achieve a noise reduction effect. Also, an assembling structure of the muffler can be simplified, resulting in reduction of fabricating cost and improvement of productivity.

Abstract: A Inlet pipe (151) communicating the space inside the hermetic enclosure with sound absorbing space (147) of inlet muffler (145) is provided so as to be inclined downward from inlet-pipe inlet (155) toward inlet-pipe outlet (157). Outlet pipe (153) communicating sound absorbing space (147) with an inlet valve includes outlet-pipe inlet (161) and outlet-pipe outlet (163). Inlet-pipe inlet (155) and outlet-pipe inlet (161) are formed at substantially same height. Herewith, introducing a refrigerant gas to outlet-pipe inlet (161) making efficient use of potential energy of the refrigerant improves the compression efficiency and stabilizes the performance of the compressor.

Abstract: A shunt pulsation trap for a screw compressor reduces gas pulsation, NVH and improves off-design efficiency without using a traditional serial pulsation dampener and a sliding valve. Generally, a screw compressor with the shunt pulsation trap has a pair of multi-helical-lobe rotors housed in a compressor chamber for propelling gas flow from a suction port to a discharge port of the compressor chamber with internal compression. The shunt pulsation trap comprises an inner casing as an integral part of the compressor chamber, and an outer casing oversized surrounding the inner casing, therein housed various gas pulsation dampening means or gas pulsation energy recovery means or gas pulsation containment means, at least one injection port (trap inlet) branching off from the compressor chamber into the pulsation trap chamber and a feedback region (trap outlet) communicating with the compressor outlet.

Abstract: A compressor system and a method of reducing noise in the compressor system. The compressor system includes an inlet port configured to receive gas, an outlet port configured to output compressed gas, and a compressor pump connected to the inlet port via a pneumatic line and to the outlet port. The compressor pump is configured to pressurize gas input through the inlet port and to output a compressed gas through the outlet port. The compressor pump generates noise during operation of the compressor pump. The compressor system further comprises a side- branch resonator having a housing forming a cavity and an elongated member connected to the housing. The elongated member is pneumatically connected to the pneumatic line between the inlet port and the compressor pump. The side-branch resonator is configured to substantially reduce noise generated by the compressor pump, to monitor an operation of the compressor pump, or both.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flowpath. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flowpath. A check valve (70; 170; 270) has a valve element (72; 172; 272) mounted for movement between a first condition permitting downstream flow along the flowpath and a second condition blocking a reverse flow. The valve element includes a resonator (112; 174; 274).

Abstract: A silencer operative for a compressor or a vacuum pump, in particular for a compressor or a vacuum pump that operate according to the displacement principle, which in either case compresses a current of gas, in particular an air current, such that the silencer includes an entrance for the gas current that leaves the compressor, as well as an exit, the silencer including a branching region having an inflow channel which branches into two channel sections, such that a first channel section is constructed as a main conduit to conduct the gas current further, and a second channel section forms a branch that is closed at its end. The branch has an axial preferential direction oriented parallel to the direction of flow of the gas current in the inflow channel, so that the gas current impinges frontally on the branch that is closed at its end.

Abstract: A hermetic compressor having a frame, a cylinder provided at one side of the frame and having a compression chamber, a cylinder head coupled to the cylinder so as configured to hermetically seal the compression chamber and having a refrigerant discharge chamber to receive a refrigerant discharged from the compression chamber, a damping discharge chamber provided at the other side of the frame, a discharge guide path formed in the frame connecting the refrigerant discharge chamber and the damping discharge chamber, a discharge pipe having an entrance end connected to the damping discharge chamber, and an extension tube provided in the damping discharge chamber. The extension tube has an entrance end connected to an exit end of the discharge guide path, an exit end being spaced apart from an entrance end of the discharge pipe.

Abstract: The invention concerns an external gear hydraulic pump including a pump body housing rotating pinions that mutually engage. Located on opposite sides of the body are a cover and a support, forming an outlet manifold for high pressure fluid. Acoustic insulation elements damp the vibrations produced by the pinions. The acoustic insulation elements acoustically decouple the pump body from the support.

Abstract: A dual drive compressor is disclosed including a discharge chamber having a wall disposed therein forming a plurality of discharge zones within the discharge chamber to attenuate pulsations caused by a fluid received in the compressor and improve a performance of the compressor.

Abstract: A method and system for reducing pulsation in a gas compressor system. A pulsation control device, such as a filter bottle or side branch absorber, is installed at a port into some location on the compressor system. The pulsation control device has a choke tube with a variable cross-sectional area, such as by having multiple conduits that may be opened or closed or a diameter that may be varied. In operation, the cross sectional area of the choke tube is varied depending on the compressor speed.

Abstract: A pressure pulsation dampener for use in a gas stream is disclosed herein. The dampener can include a housing with an inlet half and an outlet half having a recess, a shaft hole, and an extension with an outlet port. The inlet half can be secured to the outlet half, and can have an extension with an inlet port, forming a flow path. A choke plate can be disposed in the recess within the flow path. A shaft can be disposed through the outlet half to move the openings. The dampener can include an indicator plate with indicator openings. A fastener can engage the indicator openings and secure to the outlet half. The dampener can have a transducer, a motor connected to the shaft, a motor driver, and a controller in communication with the motor driver for comparing frequency rates to preset limits and activating the motor.

Abstract: A compressor system including a first compressor and a second compressor. The first and second compressors each include a shell, a compression mechanism disposed within the shell, and a drive member adapted to drive the compression mechanism. A discharge tube assembly interconnects the first compressor and the second compressor, and the discharge tube assembly includes an inlet portion adjacent the first compressor that is inclined relative to another inlet portion adjacent the second compressor. The inlet portion that is inclined is adapted to prevent a backflow of oil through the discharge tube assembly.

Abstract: A hermetic compressor has a hermetic container storing oil, and a compressing element accommodated in the hermetic container and compressing a refrigerant gas. The compressing element has a compression chamber, a cylinder forming the compression chamber, a piston inserted into the cylinder for reciprocation, and a suction muffler whose one end communicates with the compression chamber. The suction muffler has a sound deadening space, a gas flow forming part forming a gas flow flowing in a constant direction in the sound deadening space, and an oil discharge opening provided in a downstream side of the gas flow in a lower part of the sound deadening space. By this construction, there is realized a hermetic compressor in which the oil does not readily remain in the suction muffler, whose noise is lower, and whose performance is stabilized.

Abstract: The invention provides an oil pump resonator in which various vibrations caused by pulsations that change in response to changes in oil pressure on a discharge port side can be attenuated by a resonator that comprises only one chamber, whereby the volume occupied by the resonator can be minimized. An oil pump in an engine, for feeding oil from a suction port to a discharge port through rotation of a rotor fitted in a pump housing, includes: a discharge flow channel communicating with the discharge port; a resonator comprising an introduction channel formed in the discharge flow channel and a chamber communicating with the introduction channel; and a piston having a leading end face section that makes up an inner wall face of the chamber, and reciprocating in response to pulsation changes. The piston slides so as to reduce the volume of the chamber as the frequency distribution of the pulsations becomes higher.

Abstract: A method and system for reducing pulsation in a gas compressor system. A pulsation control device, such as a filter bottle or side branch absorber, is installed at a port into some location on the compressor system. The pulsation control device has a choke tube with a variable cross-sectional area, such as by having multiple conduits that may be opened or closed or a diameter that may be varied. In operation, the cross sectional area of the choke tube is varied depending on the compressor speed.

Abstract: A fuel-fired water heater includes a water storage tank, a flue positioned to receive combustion gases and transfer heat from combustion gases to water in the water storage tank, and a blower assembly. The blower assembly includes a housing defining an inlet positioned to receive combustion gases from the flue, an interior defined by the housing, and an outlet positioned to exhaust combustion gases from the interior of the housing. The blower assembly further includes a motor/impeller assembly that is positioned in the interior of the housing and is configured to direct combustion gases from the inlet of the housing toward the outlet of the housing. The housing of the blower assembly includes an interior wall portion, an exterior wall portion, and sound-absorbing material interposed between the interior and exterior wall portions. The interior wall portion defines perforations extending between the sound-absorbing material and the interior of the housing.

Abstract: An exemplary fan assembly includes a fan and a muffler. The fan includes an air outlet. The muffler is disposed at the air outlet of the fan. The muffler includes a base plate. The base plate defines vents therein and blades thereon corresponding to the air outlet of the fan. The blades extend from the base plate toward the fan. An electronic device incorporating the fan assembly is also provided.

Abstract: The present invention relates to a discharging noise system of a hermetic compressor.

Abstract: The present invention discloses a hermetic compressor which can reduce the noise by regulating a suction pressure in a connector enabling a suction pipe of a hermetic container and a suction muffler to communicate with each other. The hermetic compressor includes: a hermetic container including a suction pipe through which refrigerant is sucked and accommodating a compression mechanism unit for compressing the refrigerant; a suction muffler fixed to the compression mechanism unit and reducing the flow noise when the refrigerant passes; and a connector enabling the suction pipe and the suction muffler to communicate with each other and including a hole on a refrigerant passage to communicate with an inner space of the hermetic container. An inner pressure of the connector is equalized with an inner pressure of the hermetic container, which raises a refrigerant suction pressure.

Abstract: A supercharger has an inner wall defining an inner cavity for receiving lobed rotors for rotation therein, a low-pressure inlet and a high-pressure outlet. A sound attenuator is associated with the housing and located adjacent to the high-pressure outlet. The sound attenuator has a tuner chamber and circumferentially spaced tuner ports fluidly connecting the tuner chamber with the internal cavity of the housing to define a Helmholtz resonator. A land is defined between the circumferentially spaced tuner ports such that the high-pressure outlet and low-pressure inner chambers defined between the rotor lobes and the inner wall are fluidly connected when the rotor lobes are in alignment with the land to reduce the pressure differential between the high-pressure outlet and the low-pressure inner chambers.

Abstract: The present invention discloses a linear compressor in which a piston is linearly reciprocated inside a cylinder, for sicking a refrigerant into a compression space between the piston and the cylinder, and compressing and discharging the refrigerant, and especially, a structure of discharging the refrigerant for the linear compressor which can reduce a pulsation of a high pressure discharged refrigerant, by making the refrigerant compressed in the compression space flow from a sub-discharge space with a relatively small volume to a sub-discharge space with a relatively large volume in a discharge chamber. As a result, the structure of discharging the refrigerant for the linear compressor can efficiently reduce noise and vibration.

Abstract: A muffler that is externally mounted to a housing shell of a compressor. To externally mount the muffler to the housing shell and prevent unnecessary vibration of the muffler during compressor operation, an attachment device connects an essentially central portion of the muffler to the housing shell. The attachment device may also be adapted to house a pressure- or temperature-related sensor device.

Abstract: According to various embodiments, a method of reducing noise generated by a vacuum is described. The method comprises providing a vacuum comprising a motor including a motor shaft adapted to operate at a rotational speed of n; attaching a centripetal fan with t number of blades attached to the motor shaft; enclosing the fan between the motor and a motor housing end bracket disposed about the shaft, the motor housing end bracket defining an air input opposite an air output; wherein the variables of speed n and the number of blades t are selected so that a blade pass frequency (BPF) of the centripetal fan is greater than about 5000 Hertz, and the BPF is calculated as BPF=n*t/60. A vacuum implementing the method is also described.

Abstract: A method of reducing pulsations in a reciprocating compressor system, the system having nozzles between cylinders and filter bottles of the compressor system, the nozzles attaching at ports of the cylinders and filter bottles. A special insert is designed to be placed in one or more of the nozzle. The insert is generally cylindrical, but has a narrowed throat, a flared inlet end, and a flared outlet end. The insert dimensions, such as the inner diameter of the throat and the distance from the throat to the outlet end are calculated to reduce pulsations as well as provide pressure recovery.

Abstract: A gas flow pressure pulsation dampener includes a sealed housing having an inlet port, an outlet port a center section disposed between the inlet port and the outlet port. A choke plate is rotatably disposed in the center section and has a plurality of different size openings disposed circumferentially about the plate. The plate is positioned in the center section so that the openings are placed between the inlet port and the outlet port. The size differences between the openings and the circumferential separation between adjacent openings are selected so that the plate always presents one full opening or parts of two openings between the inlet port and the outlet port. Means for rotating the choke plate are provided to select one of the choke openings to be disposed between the inlet port and the outlet port.

Abstract: A compressor has first and second enmeshed rotors: rotating about first and second axes. The first rotor is supported by a bearing system carried by a bearing case. The bearing case has at least a first port to a discharge plenum. A first sound-absorbing material is positioned within the first port.

Abstract: A noise reduced compressor has a body, an energy dissipation element, and a structural element configured to retain the energy dissipation element relative to the body. A noise reducer for an HVAC system compressor has an energy dissipation element and a structural element connected to the energy dissipation element. A method of reducing compressor noise includes disposing an energy dissipation element between a body of the compressor and a structural element and compressing the energy dissipation element against between the body of the compressor using the structural element.

Abstract: A hyperbaric oxygen therapy system includes a pressure vessel containing a gas, an oxygen concentration measurement apparatus for monitoring the concentration of oxygen in the gas, an environmental control apparatus for controlling the temperature of the gas in the vessel, and a pressure/ventilation control apparatus for controlling the pressure of the gas in the vessel. The pressure vessel is capable of accommodating a patient. The oxygen concentration measurement apparatus includes an oxygen concentration analyzer and a plurality of gas lines connecting the oxygen analyzer to the pressure vessel. The pressure/ventilation control apparatus includes a pressure controlling valve, a pressure sensor, a ventilation valve, and a controller having a programmable pressure profile. The environmental control apparatus includes a scrubber, a heat exchanger and a blower located within the pressure vessel. A compressor for the system includes a compressor silencer.

Abstract: A compressor includes a housing and one or more working elements. A muffler is located downstream of the discharge plenum and a helmholtz resonator is located in the discharge plenum upstream of the muffler.

Abstract: A compressor has first (26) and second (28; 30) enmeshed rotors rotating about first (500) and second (502; 504) axes to pump refrigerant to a discharge plenum (42). The compressor includes a muffler system (200) comprising a sound absorbing first element (232) and a sound absorbing second element (236). The second element at least partially surrounds the first element and defines a generally annular flow path portion (230) between the first element and the second element. A wall (250) at least partially surrounds the second element. A space (259) optionally containing a sound absorbing third element (261) surrounds the wall.

Abstract: The present invention refers to a noise muffler for refrigeration compressors capable of dampening noise generated by the intermittent flow of the compressor and at the same time a muffler that reduces the loss of load in the refrigeration system.

Abstract: A discharge system for a compressor which includes a first plurality of discharge chambers connected to provide a serial discharge from the compression chamber of the compressor to an outlet and a second set of discharge chambers providing a parallel discharge path from the compression chamber of the compressor to the outlet upon the pressure in the compression chamber exceeding a predetermined value.

Abstract: A suction system for a refrigerator compressor includes a suction muffler with an outlet tube mounted to a valve plate and a cylinder head having a reinforced portion in the area of the valve plate and the outlet tube.

Abstract: A method and system for reducing pulsation in lateral piping associated with a gas compressor system. A tunable side branch absorber (TSBA) is installed on the lateral piping. A pulsation sensor is placed in the lateral piping, to measure pulsation within the piping. The sensor output signals are delivered to a controller, which controls actuators that change the acoustic dimensions of the SBA.