2898 results about "Muffler" patented technology

A compressor assembly may include a shell, a discharge fitting, a muffler, a compression mechanism, and a motor. The shell may have an opening therethrough with the discharge fitting generally extending therefrom. The muffler may be in communication with the discharge fitting and may be external to the shell. The muffler may have an inlet proximate the discharge fitting, an outlet distal from the discharge fitting, and a body portion extending therebetween. The muffler may include a valve assembly proximate the outlet. The compression mechanism may be contained within the shell and include a suction inlet and a discharge passageway. The discharge passageway may be connected to the opening in the shell for direct discharge of refrigerant from the compression mechanism to the discharge fitting. The motor may be contained within the shell and drivingly coupled to the compression mechanism.

The invention discloses a solid-state hydrogen storage fuel cell system and a control method. The solid-state hydrogen storage fuel cell system comprises a fuel cell stack and a solid-state hydrogen storage module, the solid hydrogen storage module provides hydrogen for the fuel cell stack; the solid hydrogen storage module is provided with a first heat dissipation mechanism, and the fuel cell stack is provided with a second heat dissipation mechanism; the first heat dissipation mechanism and the second heat dissipation mechanism exchange heat through the first heat exchanger; an inlet of the first heat dissipation mechanism is provided with a PTC1 heater; an outlet of the first heat dissipation mechanism is provided with a first temperature sensor; the first heat dissipation mechanism is connected with the air compressor through a cooling liquid circulation pipeline; the air compressor, the intercooler, the humidifier and the tail gas silencer are sequentially connected through air ducts; the humidifier interacts gas with the fuel cell stack; heat generated by the fuel cell stack and waste heat of the air compressor are used for supplying heat to solid hydrogen storage and release, so that a radiator of the air compressor is omitted, and the integration difficulty of the solid hydrogen storage fuel cell system is reduced.

The invention provides a thermal behavior experiment system and method under a narrow rectangular channel reflooding cooling condition. The system comprises a heating water storage tank, a nitrogen tank, a steam tank, a shield pump, a preheating section, a first direct-current power supply, a second direct-current power supply, a narrow rectangular channel test section, a steam-water separator, a surge tank, a flow control valve, a silencer and an electromagnetic valve. The experimental working medium is deionized water, and re-submerging cooling experiments under different system pressures, working medium supercooling degrees, heating wall surface heat flux densities, working medium submerging speeds, heating wall surface initial temperatures and channel interior initial liquid levels can be carried out on an experimental section of a narrow rectangular channel structure. The device is suitable for narrow rectangular channel structures with different sizes, and can be used for carrying out re-submerging experiments on experiment sections with single-plate double-channel, double-plate three-channel and more channels. The system pressure and the inlet flow in the submerging process can be kept stable, and it can be ensured that the supercooling degree of a working medium, the heating wall surface temperature and the initial liquid level are controllable.

The invention provides a pressure release valve with an active silencing function, which comprises a valve body provided with a liquid inlet cavity and a pressure release cavity which are communicated with each other; the bypass pipe is communicated with the liquid inlet cavity; the pressure relief assembly comprises an adjusting part, a pressure relief elastic part and a pressure relief valve element, the pressure relief valve element and the pressure relief elastic part are arranged in the pressure relief cavity, the adjusting part is movably arranged on the valve body, and the pressure relief elastic part is arranged between the adjusting part and the pressure relief valve element in a pressed mode; the piezoelectric actuator is arranged on the liquid inlet cavity, the noise reduction elastic piece is arranged between the driving end of the piezoelectric actuator and the pressure relief valve element in a pressed mode, and the piezoelectric actuator is configured to drive the noise reduction elastic piece. According to the pressure release valve with the active noise elimination function, an active noise elimination technology is introduced into pulsating noise control of the pressure release valve in the mode of arranging the piezoelectric actuator, and the acting force applied to the pressure release valve element can be adjusted through the noise reduction elastic piece so that transient noise caused by pulsating pressure when the pressure release valve element moves can be eliminated.

The invention provides a fuel cell cooling system based on a vortex tube cooling effect, which comprises an air compressor, an intercooler, a humidifier, an electric pile, a check valve, a silencer, a three-way valve and a heat dissipation assembly which are connected in sequence, and is characterized by further comprising a vortex refrigeration tube and a plate heat exchanger, and the vortex refrigeration pipe is arranged between the silencer and the stop valve. According to the fuel cell cooling system based on the vortex tube cooling effect, by arranging the vortex cooling tube, high-pressure gas discharged from the tail of the system is utilized, and cold air generated by the vortex cooling tube is merged into the cooling system of the system, so that the energy consumption of heat dissipation is reduced, and the overall efficiency of the system is improved; and the volume of a heat dissipation assembly part which is one of the maximum components of the system is reduced, so that the overall volume of the system is reduced, and the volume power density of the system is improved. The auxiliary power consumption of the system is indirectly reduced, the integration level of the system is higher, and the cost is reduced.

A linear compressor includes a cylinder, a piston axially reciprocating in the cylinder, a first muffler unit coupled to the piston, a back cover that is disposed at a rear of the piston and defines an opening at a radially central area, and a second muffler unit coupled to the opening. The first muffler unit includes an inner guide disposed in the piston and a first intake muffler disposed at a rear of the inner guide. The second muffler unit includes a second intake muffler that communicates with the first intake muffler and is coupled to the opening, a muffler body surrounding the second intake muffler, and a muffler cover disposed between the muffler body and the back cover.

Provided are a cleaning device and a cleaning system, relating to the technical field of electric devices. A cleaning device (10) comprises: a fan assembly (100), wherein the fan assembly (100) provides a suction force for the cleaning device, and the fan assembly (100) is provided with a second air outlet; an air duct (410); and a first air outlet (430) and a first air inlet (420) communicated with the air duct (410), wherein the first air inlet (420) is communicated with the second air outlet (114) of the fan assembly (100), and a silencer (500) is provided in the air duct (410) so as to reduce noise. The silencer (500) is provided in the air duct (410), such that the noise can be reduced as the noise passes through the silencer (500) along with airflow, and the noise diffused to the outside can be reduced, thereby achieving a noise reduction effect.

The invention relates to the technical field of silencers, in particular to a generator set water-cooling silencer which comprises a working mounting plate and a water-cooling silencer body, matched connecting frames are symmetrically and fixedly arranged at the two ends of the working mounting plate, locking inserting holes are formed in the matched connecting frames, and the water-cooling silencer body is mounted on the working mounting plate. A water inlet pipe is fixedly arranged at one end of the water-cooling silencer body, a first sealing connecting groove is formed in the water inlet pipe, the water-cooling silencer body is very convenient to assemble and disassemble, and a first connecting pipe sleeve and a second connecting pipe sleeve can be driven to move only by pushing an operation batten downwards; according to the water-cooling silencer, the water inlet pipe and the water outlet pipe are connected with a water-cooling system pipeline, meanwhile, the water-cooling silencer body can be fixedly connected with the working mounting plate, three purposes are achieved, operation is easy, convenient and rapid, the working intensity of workers is reduced to a great extent, and the mounting and dismounting efficiency of the water-cooling silencer is greatly improved.

A muffler for use in a positive airway pressure system includes a housing with an inlet port adapted to operatively couple to receive a pressurized gas flow, an outlet port, and a tubular body extending between the inlet port and the outlet port. The muffler also includes a muffler insert positioned within the tubular body in an abutting relationship with an inner surface of the body. The muffler insert defines: a first chamber proximate the inlet port; a second chamber proximate the outlet port; and an intermediate chamber separate from, and located between, the first and second chambers. First and second pluralities of apertures are adapted to direct the pressurized gas flow between adjacent chambers. The muffler attenuates noise associated with the pressurized gas flow as the pressurized gas flow passes through the muffler.

The utility model discloses a pressure regulating silencer with a deslagging function, which comprises a silencing pipe, a pressure regulating sleeve sleeved on the silencing pipe and a silencing outer sleeve sleeved outside the pressure regulating sleeve, a silencing chamber is formed between the silencing pipe and the silencing outer sleeve, a deslagging silencing hole communicated with the silencing chamber is arranged on the silencing pipe, and a deslagging hole is arranged on the silencing outer sleeve. The residue discharging holes are formed in the silencing outer sleeve, so that independent residue discharging paths are formed among the residue discharging silencing holes in the silencing pipe, the silencing chamber between the silencing pipe and the silencing outer sleeve and the residue discharging holes in the silencing outer sleeve, and residues do not need to enter the nail fixing device any more. The nail fixing device effectively prevents the residues from entering the nail fixing device to cause corrosion, jamming and other damage to key components (such as a firing pin assembly), greatly prolongs the service life of related equipment components, reduces the maintenance frequency and cost caused by component damage, does not need to disassemble and assemble the nail fixing device main body to clean the residues in the nail fixing device, and improves the working efficiency. And the overall reliability and stability of the equipment are improved.

The utility model discloses a silencer and an air conditioner. The silencing device is applied to the air conditioner, the air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve and a compressor, the inlet end of the silencing device is communicated with the exhaust end of the compressor, the outlet end of the silencing device is connected with the four-way valve, and the silencing device comprises at least two silencing branches. Each silencing branch is correspondingly provided with a silencer, and the connection relation between different silencers can be changed; and the controller is used for controlling the connection relationship between different silencers in the silencing device, so that the silencing parameters of the silencing device are changed, and the silencing amount of the silencing device is changed. By means of the air conditioner, noise of different frequencies can be reduced, the noise between the indoor part and the outdoor part of the air conditioner can meet the noise requirement, and the user experience is improved.

A method of designing a silencer by using an acoustic metamaterial according to the present disclosure includes distributing design variables through an experimental design method, performing optimal design on initial design proposals, obtaining an insertion loss of an optimal unit cell, and selecting a unit cell to be used first for effective noise reduction.

The invention discloses a pipeline flow-induced and sound-induced vibration detection and acoustic modal analysis experimental device which comprises a main pipeline, one end of the main pipeline is connected with a gas source, the other end of the main pipeline is connected with a first silencer, the other end of the first silencer is connected with a replaceable experimental pipeline, and the other end of the replaceable experimental pipeline is connected with a second silencer. The main pipeline and the replaceable experiment pipeline are on the same straight line; a flow adjusting part is arranged on the main pipeline close to the gas source; a modal analysis part and a pressure detection part are sequentially arranged at the position, close to the second silencer, of the replaceable experiment pipeline in the airflow direction; the system further comprises an experimental data acquisition part which is connected with the flow regulation part, the pressure detection part and the modal analysis part. The invention further discloses a pipeline flow-induced and sound-induced vibration detection and sound modal analysis method. A pipeline vibration test result obtained through the experimental device is high in precision and high in reliability, and meanwhile, a test part is convenient to disassemble and replace.

Systems and apparatuses include a container for a generator set. The container includes a housing including a cooling room structured to support a radiator and a radiator fan within the housing, an exhaust room structured to support an aftertreatment system, an engine room structured to contain the engine and the alternator within the housing, an air intake system positioned adjacent the engine room, and a control room structured to support control equipment for the generator set. The exhaust room may further support after treatment components including a muffler and an exhaust pipe.

The invention provides an automatic bonding device for motor silencing sponge, and relates to the technical field of motor production. The device comprises a sponge feeding assembly, an end cover feeding assembly, a gluing device, a material collecting device, a rotating table and three sets of material moving assemblies, and the sponge feeding assembly, the end cover feeding assembly and the material collecting device all correspond to one set of material moving assembly; a plurality of material bearing parts are arranged on the rotating table, and the positions of the material bearing parts can be switched according to the sequence of a feeding station, a gluing station, a bonding station and a discharging station; the sponge feeding assembly is used for providing silencing sponge and moving the silencing sponge to the feeding station through the corresponding material moving assembly. The gluing device can spray glue to the silencing sponge at the gluing station; the end cover feeding assembly is used for providing a motor end cover and moving the motor end cover to the silencing sponge at the bonding station through the corresponding material moving assembly to form a finished product; a material moving assembly corresponding to the material collecting device can move finished products at the discharging station into the material collecting device. The assembling device has the effect of being high in assembling efficiency.

The invention relates to the technical field of fluid dynamics experimental equipment, in particular to a circulating water tunnel in a low-noise environment, comprising: a water source power mechanism comprising a high-level water tank for bearing a water source and a water flow adjusting module for providing power for water flow in the high-level water tank through air pressure driving; the rectification test mechanism is used for adjusting water flow and performing a water flow test; the water source recovery mechanism is used for collecting the water source discharged by the rectification test mechanism and conveying the discharged water source to a high-level water tank of the water source power mechanism so as to maintain water balance of the circulating water tunnel; the noise reduction mechanism comprises a silencer, an iron sand frame and a flexible rubber plate; the data acquisition mechanism is used for acquiring the water level of the high-level water tank, the water flow speed of the test section and the noise intensity generated by the water flow adjusting module in the air pressure driving process. The noise can be effectively reduced.

A muffler assembly for a vehicle exhaust system including a muffler that has a primary muffler conduit with a primary resonator, a secondary muffler conduit with a secondary resonator, and a valve that directs exhaust flow through both the primary and secondary muffler conduits or primarily through the secondary muffler conduit depending on the position of the valve. The muffler provides a first level of sound attenuation when the valve is in an open position and a second level of sound attenuation when the valve is in a closed position. The second level of sound attenuation is greater than the first level of sound attenuation and therefore the muffler provides a louder exhaust sound when the valve is in the open position and a quieter exhaust sound when the valve is in the closed position.

The utility model discloses a high-parameter thermal power generating unit depressurization blowpipe temporary system, which belongs to the technical field of unit depressurization blowpipes and comprises a primary steam-water system, a secondary steam system, a target plate device and a silencer which are sequentially connected. The primary steam-water system comprises a separator, a superheater and a main steam pipeline which are connected in sequence, the secondary steam system comprises a hot resteam pipeline, a reheater and a cold resteam pipeline which are connected in sequence, the cold resteam pipeline is provided with a main adjacent blowing door, the main steam pipeline is communicated with the cold resteam pipeline through a high-pressure bypass pipeline, and the reheater is communicated with the high-pressure bypass pipeline. And the high-pressure bypass pipeline is provided with a high-pressure bypass adjacent blowing door. The secondary steam system and the high-pressure bypass system both participate in pipe blowing heat storage, the effective time of pipe blowing each time can be prolonged, the pipe blowing frequency is reduced, high efficiency and energy conservation are achieved, and stress damage to a boiler is relieved.

The invention relates to the technical field of silencer machining, in particular to a production and machining control system and method for an air conditioner silencer, and the method comprises the steps: obtaining an equivalent gap of a joint region, and determining whether the joint gap of a welding region is in a standard interval or not; when the joint gap is in the standard interval, the critical stress of the joint area is estimated according to the joint gap of the welding area and the linear expansion coefficient of the assembly material, and the risk level of the copper pipe in the joint area during high-frequency brazing is determined; when the copper pipe in the joint area is at the first risk level, the welding mode of high-frequency brazing is determined according to the critical stress; after the welding mode of brazing is determined, the welding stage where a weld joint is located is determined according to the temperature rising speed, and a corresponding brazing strategy is adopted; the current fluctuation of the induction coil is detected in the high-frequency brazing process, and the initial current frequency is adjusted back according to the fluctuation duration. The dissimilar metal welding defect rate is reduced by adjusting the welding mode and the brazing strategy of high-frequency brazing.

The utility model relates to a three-stage vacuum pump set using a water-cooling variable-frequency integrated motor. The dry type vacuum pump comprises a roots vacuum pump, a roots pump support frame, a rack and an air inlet flange, and is characterized by further comprising a two-stage dry type vacuum pump, an upper pump and lower pump connecting flange, an electric control system, an exhaust silencer, a communication line connector and a power line connector, and the two-stage dry type vacuum pump is composed of a high-pressure-difference roots vacuum pump and a dry type screw vacuum pump; the two-stage dry vacuum pump is installed on the rack and located under the roots vacuum pump; an air outlet of the roots vacuum pump is connected with an air inlet of the two-stage dry vacuum pump through the upper and lower pump connecting flange, and the exhaust silencer is connected with an air outlet of the two-stage dry vacuum pump; and a shell of the high-pressure-difference roots vacuum pump and a shell of the dry-type screw vacuum pump in the two-stage dry-type vacuum pump are provided with cooling water jackets. The Roots vacuum pump is reasonable in structural design, small in size and capable of dealing with the large-load working condition, and the overall failure rate of the Roots vacuum pump is reduced.

A spiral muffler (2) comprising a channels housing (8) and formed therein a centre channel (4) and at least one outer spiral channel (6), the channels housing having an inner tube wall (10) surrounding the centre channel (4) and an outer tube wall (12) forming an outer wall of the at least one outer spiral channel (6), the at least one outer spiral channel (6) being formed between the outer tube wall (12) and the inner tube wall (10), the channels housing further comprising at least one spiral wall (14) defining a spiral form of the at least one outer spiral channel (6) spiraling from a first axial side of the muffler to a second axial side of the muffler. The channels housing is formed of a plurality of stacked muffler modules (3), each muffler module comprising one or more spiral blades (14a, 14b), each spiral blade extending from a first end at a first axial side of the muffler module to a second end (22) at a second axial side of said muffler module, first and second ends of adjacent stacked muffler modules joining together in a contacting manner at said interfaces such that said at least one spiral wall (14) is formed from a plurality of stacked said spiral blades (14a, 14b).

The invention provides a silencer, an air suspension assembly and a vehicle, relates to the technical field of vehicles, and aims to reduce the size of the air suspension assembly. The silencer comprises a flow guide plate, a shell, an air suction end cover and a silencing piece. The guide plate has guide holes. The shell is provided with a containing space, the flow guide plate abuts against the inner wall of the containing space so that the containing space can be divided into a silencing cavity and a pressure reduction cavity, the silencing cavity communicates with the pressure reduction cavity through the flow guide hole, the silencing cavity is provided with an exhaust port, and the pressure reduction cavity is provided with an exhaust port used for being connected with an exhaust pipe. The air suction end cover extends from one side of the shell to the direction away from the shell to form an air suction cavity, the end, away from the shell, of the air suction cavity is provided with an air suction port and an air suction port, the air suction port communicates with the outside, and the air suction port is used for being connected with an air supply pipe. And the silencing piece is arranged in the silencing cavity. Therefore, the size of the air suspension assembly can be reduced, and the cost of the air suspension assembly can be reduced.

The invention discloses a compressor and refrigeration equipment, and relates to the technical field of compressors. The compressor comprises a shell, a pump body assembly and a motor, the pump body assembly is located in the shell, a crankshaft of the pump body assembly is arranged on the upper silencer, the upper bearing, the first air cylinder, the second air cylinder and the lower bearing in a penetrating mode, a stator assembly of the motor is fixedly connected with the inner wall of the shell, and a rotor assembly is connected with the crankshaft. Due to the fact that a lower balance block is too close to an upper silencer or the diameter of the lower balance block is too large, disturbance to a refrigerant discharged by the lower silencer is increased, and the oil spitting rate is increased. The value of L * H / (H * D) is reasonably set to be within the range of 0.17-2.1, disturbance of the lower balance block to a refrigerant can be reduced, backflow of lubricating oil is facilitated, the oil spitting rate is reduced, meanwhile, it can be guaranteed that the overall size of the compressor is not too large, and compact design of the structure of the compressor is facilitated.

The present invention relates to the technical field of silencers, and in particular to a sheet-type silencer, comprising: a silencer sheet, and a silencer outer shell, wherein the silencer outer shell is suitable for accommodating at least two silencer sheets at intervals, and an airflow channel is formed between the two silencer sheets; the silencer sheet comprises: a silencer sheet outer shell, which is at least partially composed of a perforated plate, and is composed of at least two perforated plates with different perforation rates; and a sound-absorbing material, wherein the sound-absorbing material is uniformly filled inside the silencer sheet outer shell. The sheet-type silencer provided by the present invention makes the silencer sheet outer shell composed of at least two perforated plates with different perforation rates, and adopts different perforation rates to silence different frequency spectrum parts of the noise source, thereby achieving the best overall sound reduction under the same pressure loss conditions.

The application discloses a punching device for motorcycle exhaust muffler pipes and particularly relates to the technical field of punching devices, which comprises a supporting frame, a clamping and punching assembly arranged on the supporting frame, the clamping and punching assembly comprising a central cylinder arranged in the supporting frame, one end of the central cylinder being provided with an adjusting circular truncated cone cylinder, and a plurality of clamping blocks being arranged on the middle part of the adjusting circular truncated cone cylinder. The clamping blocks can be synchronously contracted or expanded along the radial direction, and the arc-shaped fitting grooves on the clamping blocks and the rubber pads can stably clamp the motorcycle exhaust muffler pipes with a certain range of outer diameter differences. The punching device can solve the problem that the traditional punching device can only be adapted to single-specification pipes and the time-consuming replacement of molds, greatly improve the universality of the equipment, simultaneously punch different positions of the same section of the muffler pipe, and automatically feed the slip ring through the motor-driven screw rod, so that the clamping, angle adjustment, punching and resetting linkage operation can be completed, manual intervention is reduced, and the operation strength is reduced.

The invention discloses an evaporator and storage equipment, and belongs to the technical field of refrigeration. The evaporator comprises a base plate, an evaporation pipe, a capillary pipe and a silencer, the evaporation pipe is arranged on the base plate, and the outlet end of the evaporation pipe is used for being communicated with the outside; the capillary tube is arranged on the substrate; the inlet end of the capillary tube is communicated with the outside; the silencer comprises a shell and at least one perforated plate, the shell forms a containing cavity, the outlet end of the containing cavity is communicated with the inlet end of the evaporation pipe, the inlet end of the containing cavity is communicated with the outlet end of the capillary pipe to form a heat dissipation loop allowing a refrigerant to flow, the perforated plate is installed in the containing cavity, and a plurality of through holes are formed in the perforated plate. And the axis of the through hole is parallel to the flowing direction of the refrigerant. The silencer is arranged between the capillary tube and the evaporation tube, and the silencer comprises the shell and the perforated plate located in the shell, so that the transition length of a refrigerant from the capillary tube to the evaporation tube is prolonged as much as possible, fluid noise and vibration are weakened, the noise reduction effect is improved, and the use experience of a user is improved.

The present application relates to the technical field of silencer, especially to a silencing assembly and a silencer, the silencing assembly is provided with a first panel, a second panel, a first connecting piece and a second connecting piece; the transparent first panel and the second panel are opposite and spaced apart; the first panel is provided with a plurality of through holes; the first connecting piece and the second connecting piece are opposite and spaced apart; one end of the first connecting piece is connected with the first panel, and the other end is detachably connected with the second panel; one end of the second connecting piece is connected with the first panel, and the other end is detachably connected or hinged with the second panel; the first panel, the second panel, the first connecting piece and the second connecting piece enclose a cavity in the shape of a cuboid. When dust collection affects the silencing effect, the second panel can be detached or rotated to open the inside of the silencing assembly for cleaning, and the dust collection is cleaned away, so that the silencing effect is ensured not to be affected by cleaning the dust collection, which is easy to realize, has higher efficiency and lower cost.

The invention discloses a silent and noise-reducing oxygen generator, comprising an organic shell, a base is provided at the bottom of the shell, a molecular adsorption tower is provided on one side of the outside of the shell, a solenoid valve is provided at the upper end of the inside of the shell, a turbine fan is provided below the solenoid valve, a muffler is connected to the turbine fan, a muffler chamber is provided at the bottom of the base, a muffler plate is installed in the muffler chamber, a compressor is installed on the muffler plate through a spring assembly, a plurality of groups of mutually parallel partitions are provided at the bottom of the muffler plate, muffler holes are provided on the rear end plate surface of the partition, an air guide arc plate is provided on the front end relative to the outer side of the outermost partition, and an air guide plate is provided at the bottom of the muffler plate; the invention can effectively reduce the airflow sound and nitrogen exhaust noise of the device during oxygen production by taking in air from one side of the upper part of the shell, the airflow changes the exhaust airflow guide and disperses the airflow energy after passing through the muffler chamber and the muffler plate, thereby reducing the noise generated by the exhaust airflow.

The utility model discloses a claw type compressor pressure release valve and belongs to the technical field of pressure release valve manufacturing. Comprising a valve body, a sealing nut, a silencer, a mounting seat and a valve element assembly, the sealing nut is arranged at an upper port of the valve body, the mounting seat is arranged at a lower port of the valve body, and the valve element assembly is arranged in the valve body and comprises an adjusting rod, a center rod, a spring seat, a spring and a valve element. The middle of the bottom of the valve element extends downwards to form a fixing column, a plurality of fixing supports are evenly distributed on the periphery of the fixing column, a cavity is formed in the space between every two adjacent fixing supports, the valve element is expanded in the radial direction to form a valve element end face, and the valve element end face is placed on the mounting base end face at the top of the mounting base. The fixed support is contained in the inner hole of the mounting base, high-pressure gas enters the cavity from the inner hole to push away the end face of the valve element, and the gas enters the valve body and is finally exhausted from the silencer. The pressure relief valve has the advantages that the working stability of the pressure relief valve can be improved, and the output pressure of the claw compressor is constant.

The object of the present invention is to provide a silencer that does not become brittle at low temperatures even with low-temperature gases, does not cause clogging, and has low resistance. [Solution] The silencer (A1, A2) comprises a gas inlet (4) through which low-temperature gas is introduced, a gas outlet (5) through which the low-temperature gas is discharged, and a gas passage (6) through which the low-temperature gas flows, and is provided with a passage-forming member (1) whose wall surface is made of mesh-like metal, a sound-absorbing material (2) that covers the outer periphery of the passage-forming member, and an exterior material (3) that covers the outer periphery of the sound-absorbing material, thereby reducing the sound emitted from the gas outlet.