108 results about "Expansion chamber" patented technology

A valve unit for an anti-lock braking system has a valve body, a piston, and an elastic element acting on the piston. The valve body has an outlet port, an inlet port, a primary chamber communicating with the outlet port, an expansion chamber with an outflow passage establishing fluid communication between the primary chamber and the expansion chamber, and a bypass passage between the inlet port and the outlet port. The piston is movable in the primary chamber and has a longitudinal through cavity, a first transversal surface facing the outlet port, and a second transversal surface facing away from the outlet port. The first transversal surface has an area smaller than the area of the second transversal surface. The elastic element exerts an elastic force to move the piston away from the outlet port. The valve unit is activatable by pressure of a brake fluid in the primary chamber.

This invention relates to the field of magnetic bearing technology, solving the problem of magnetic levitation bearings being easily damaged by impurities and particulate matter. It proposes a magnetic bearing purification and protection system, including a magnetic levitation bearing installed in an expander. The magnetic levitation bearing is connected to a main shaft, which is fixedly connected to an impeller in the expansion chamber of the expander. An air chamber is provided around the expansion chamber, connected to it via an air inlet perpendicular to the impeller shaft. The air outlet direction of the expansion chamber is along the impeller shaft towards the outside of the expander. The impeller is equipped with a throttling orifice device to remove impurities from the magnetic levitation bearing. The inlet of the air chamber is connected to a filter purification device to remove impurities and particulate matter from the gas. This invention ensures the stable operation of the magnetic levitation bearing and the safe operation of the system.

The utility model provides a liquid expansion mandrel fixing device for processing a hard chromium plated ball, which belongs to the technical field of hard chromium plated ball processing, and comprises a mandrel main body, and the inner part of the mandrel main body is divided into cavities and is used for realizing uniform expansion; a filling hole is formed in one side of the core shaft main body and is used for filling a hydraulic medium into the core shaft main body; a sealing screw is arranged at an opening of the filling hole; an expansion chamber and a compression chamber are arranged in an inner cavity of the mandrel body, the compression chamber is arranged on one side of a center shaft of the mandrel body, and a linkage structure is arranged in the compression chamber and used for clamping a ball. The utility model provides a liquid expansion mandrel fixing device for processing a hard chromium plated ball, which can solve the problems that the clamping force is concentrated on a local area and a plating layer is easy to crush due to the single-cavity design of the existing liquid expansion mandrel.

The invention discloses a denitration, desulfurization and noise elimination integrated purification system for a ship. The system comprises a cylindrical shell, and the interior of the cylindrical shell is divided into two cavities, namely a first expansion cavity and a second expansion cavity, by a perforated plate and a perforated pipe which are fixed to the cylindrical shell; the perforated pipe serves as an inner electrode, the cylindrical shell serves as a grounding electrode, an annular space among the perforated plate, the perforated pipe and the aluminum oxide ceramic serves as a discharge area, and the first expansion cavity and the second expansion cavity serve as an absorbent premixing and primary silencing unit and a plasma reaction and secondary silencing unit respectively. And a chemical absorption unit and a waste liquid collection unit are arranged at the downstream of the plasma reaction and secondary silencing unit in the tail gas flowing direction. According to the system, the two stages of expansion cavities and the tubular electrodes installed on the perforated plate form a composite noise elimination structure, and remarkable noise reduction is achieved. The device has the outstanding advantages of being compact in structure, light in weight, free of catalyst dependence, efficient in working in a wide temperature range and the like, and has a good reduction effect on harmful gas in low-temperature flue gas of a ship engine.

The utility model discloses a heat exchange system and a vehicle, and relates to the technical field of vehicles, the heat exchange system comprises an expansion box, the interior of the expansion box is provided with two mutually independent expansion cavities, one of the two expansion cavities is communicated with a first heat exchange loop, and the other of the two expansion cavities is connected with a second heat exchange loop; the driving pump is provided with two runners which are independent of each other, one of the two runners communicates with the first heat exchange loop so as to drive the heat exchange medium to flow in the first heat exchange loop, and the other runner communicates with the second heat exchange loop so as to drive the heat exchange medium to flow in the second heat exchange loop; and the other one of the two flow channels communicates with the second heat exchange loop so as to drive a heat exchange medium to flow in the second heat exchange loop. According to the technical scheme provided by the utility model, a traditional pure electric liquid cooling vehicle type cooling system is simplified.

The invention particularly relates to a flow dividing assembly and heating and ventilation equipment. The flow dividing assembly comprises a distributor and a second connecting pipe. The distributor is provided with an inflow hole, an expansion cavity and a plurality of flow dividing holes which are formed in sequence, and the inflow hole communicates with the flow dividing holes through the expansion cavity. And at least part of the second connecting pipe penetrates through the inflow hole and extends to the insertion section in the expansion cavity. In the direction from the inflow hole to the diversion hole, the first end of the insertion section is used for allowing a refrigerant to flow in, the second end of the insertion section is in a closed state and located in the expansion cavity, a plurality of outflow holes are formed in the circumferential direction of the insertion section, and the inflow holes are located in the expansion cavity and spaced from the second end of the insertion section. According to the flow dividing assembly, the blind pipe structure at the second end of the insertion section is used for mixing the backflow effect caused by flowing of gas and liquid refrigerants at the inlet, the effect of fully mixing the gas and liquid refrigerants is achieved, and the problems of bias flow caused by non-uniform distribution of the refrigerants in the inflow pipe and non-uniform mixing of the refrigerants in an old distributor are solved.

This invention discloses an ejection device with an adjustable expansion chamber volume, comprising: a base support, a launch tube, and an ejection controller. The launch tube is mounted on the base support, the expansion chamber is located at the rear of the launch tube, the directional device is located at the head of the launch tube, and the combat load is set inside the directional device. The expansion chamber contains a spring A, a movable base plate, and a limiting device. One end of spring A is connected to the inner bottom surface of the closed end of the expansion chamber, and the other end is connected to surface A of the movable base plate. The limiting device is used to limit the movable base plate. A cavity is formed between surface B of the movable base plate and the bottom surface of the combat load. The ejection controller controls the ejection power source to generate a working medium, which is released into the cavity to generate pressure, thereby ejecting the combat load. This invention can dynamically adjust the expansion chamber volume according to the expansion chamber pressure during the ejection process, reducing overload on the load, avoiding adverse effects on the electronic components of the load, and also reducing the recoil generated by the ejection, thus achieving miniaturization of the ejection device.

The invention discloses an impedance silencing device and a working method thereof.The device comprises a silencer barrel, an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are located at the two ends of the silencer barrel, the impedance silencing device is characterized by further comprising a silencing assembly and a flow guide mechanism, the silencing assembly and the flow guide mechanism are arranged in the silencer barrel, the inner diameter of the air inlet pipe is gradually increased in the airflow direction, and the outer diameter of the air outlet pipe is gradually increased in the airflow direction. The inner diameter of the air outlet pipe is gradually reduced in the airflow direction, and the air inlet pipe, the silencer barrel and the air outlet pipe form an expansion chamber structure. The silencing assembly comprises silencing plates which are fixedly arranged in the silencer barrel and divide an inner cavity of the silencer into a plurality of silencing channels connected in parallel. The flow guide mechanism comprises a flow guide cone arranged on the air inlet pipe, the flow guide cone is connected with a control assembly used for controlling the flow guide cone to move in the axial direction of the silencer barrel, the problem that the silencing performance and operation energy consumption of a fixed silencer cannot be considered at the same time under the variable working conditions is solved, and self-adaptive broadband efficient silencing and energy-saving operation are achieved.

The four-turbine double-exhaust-port diesel engine comprises a silencer body, a left air inlet cavity, a middle cavity and a right air outlet cavity are formed in the silencer body, the left air inlet cavity is provided with two air inlet pipes, the middle cavity is provided with two perforated pipes, and the right air outlet cavity is provided with two air outlet pipes; the two ends of the perforated pipe are connected with the left air inlet cavity and the right air outlet cavity respectively, and a first partition plate is arranged in the middle of the perforated pipe. The silencer is reasonable in structural design, and the flowing direction of gas in the silencer is the gas inlet pipe, the left side gas inlet cavity, the left side of the perforated pipe, the middle cavity, the right side of the perforated pipe, the right side gas outlet cavity and the gas outlet pipe in sequence. Noise reduction is carried out through an expansion cavity with the size larger than two times of the size of a single-inlet-single-outlet silencer, and the noise reduction effect is greatly improved.

The utility model discloses a steam jet pump, including the pump body and its inside chamber, the chamber inside is provided with mixing chamber, compression chamber, throat pipe and expansion chamber in proper order, and the communicating pipe is communicated with the chamber on the pump body, and the steam inlet and steam outlet of pump body and the communicating pipe are all set up a plurality of groups of through -hole for bolt to pass through on the one end away from the pump body, and the through -hole all is provided with fixed cylinder, and the fixed cylinder is provided with the locating cylinder, and the locating cylinder is provided with internal thread in, and the locating cylinder is located fixed cylinder outside one end and is equipped with gear, and the steam inlet and steam outlet and the communicating pipe each side to the pump body is provided with drive ring, and the drive ring inner wall is provided with the rack that is engaged with the gear, and the conventional pump body's each interface is all provided with a plurality of groups of bolt nut and is connected and is installed, and personnel one one is very troublesome to tighten and dismount, and it is not convenient when replacing maintenance, the utility model discloses can improve the dismounting efficiency of pump body butt joint.

The application discloses a kind of karst region adaptability modular expansion pile device and its construction method, belong to pile foundation engineering technical field, the device includes by a plurality of modular pile section splicing and is fixed by connecting piece and is formed pile body, expansion chamber, grouting system, valve control and pressure monitoring system and monitoring assembly are arranged in the pile body, the bottom end of pile body is fixed with bottom disc, and the bottom surface of bottom disc is provided with a plurality of drill bits, and the inner cavity of pile body is provided with mud filling pipeline along the axial direction.The grouting system includes the grouting pipeline arranged along the inside of pile body, and the grouting port is arranged in communication between the grouting pipeline and expansion chamber, and the switch valve is arranged on the grouting port branch, and the pressure monitoring unit is arranged on the grouting pipeline, and the monitoring assembly includes multidimensional sensor.The application can simplify construction process, reduce material consumption, improve the adaptability, reliability and safety and stability of pile foundation construction in karst region.

This utility model discloses a self-venting centrifugal pump for transporting lithium carbonate gas-liquid mixtures, relating to the field of fluid transport equipment technology. The aim is to achieve gas-liquid separation transport using a centrifugal pump, and the following technical solution is proposed: It includes a pump body, a first rotating shaft disposed within the pump body, a pump cover mounted on the rear side of the pump body, and a mechanical seal housing mounted on the rear side of the pump cover. An impeller is mounted on the first rotating shaft, and a second rotating shaft, coaxially arranged with the first rotating shaft, is disposed within the mechanical seal housing. A vacuum wheel is mounted on the second rotating shaft. An expansion chamber is formed at the bottom of the mechanical seal housing, and the expansion chamber is connected to the impeller chamber via the vacuum wheel chamber containing the vacuum wheel. This utility model provides an effective gas discharge path, allowing the centrifugal pump to focus on liquid transport, while the gas inside the centrifugal pump is discharged through the expansion chamber on the mechanical seal housing, thereby achieving gas-liquid separation transport in the centrifugal pump.

This invention relates to a five-axis machining center for metal processing, belonging to the field of metal processing equipment, and aims to solve the problems of clamping force attenuation, vibration, and inconvenience in disassembling and assembling the milling head during high-speed milling in existing equipment. It includes a machine tool body, a milling spindle, and a milling head. The end of the milling spindle is equipped with a hydraulically clamped milling head fixing mechanism, comprising a closed hydraulic expansion chamber, multiple sets of tilting embedded centrifugal compensation cylinders, and a milling vibration reduction assembly. The locking bushing within the hydraulic expansion chamber can radially elastically deform to grip the milling head shank. The counterweight piston within the centrifugal compensation cylinder generates centrifugal force with the rotational speed, linking a hydraulic linkage circuit to achieve dynamic compensation of the clamping force. Simultaneously, the milling vibration reduction assembly absorbs energy through damping springs and dissipates vibration through energy-dissipating sliders. This invention balances high-speed clamping stability, vibration resistance, and automation adaptability, extending the life of equipment and tools, and improving the high-speed precision machining capability and automation level of the machining center.

The invention relates to the field of switches with arc extinguishing or arc preventing devices, in particular to a self-energy arc extinguishing chamber and a circuit breaker. The self-energy arc extinguish chamber comprises an air compression chamber cylinder barrel internally provided with a partition plate, a moving contact is installed in the air compression chamber cylinder barrel in a sealed and sliding mode on the front side of the partition plate, the moving contact is connected with a transmission rod penetrating through the partition plate in a sealed and sliding mode, an exhaust port is formed in the transmission rod, and an expansion chamber is formed in the moving contact. An air compression chamber is formed between the partition plate and the moving contact in the air compression type cylinder barrel, an exhaust chamber is formed on the side, opposite to the air compression chamber, of the partition plate, a pressure release valve and an air supplementing valve are arranged on the partition plate, a check valve is arranged on the moving main contact, an air supplementing opening is formed in the cavity wall of the exhaust chamber, and an air guide channel is formed between the air supplementing opening and the air supplementing valve. Gas exhausted from the transmission rod is isolated through the gas guide channel. Therefore, the high-temperature decomposed gas and impurities can be prevented from being supplemented into the air compression chamber along with the insulating gas, so that the gas supplemented into the air compression chamber is relatively clean insulating gas, and the arc extinguishing effect of the arc extinguishing chamber is improved.

This utility model relates to the field of pipeline sealing technology, and in particular to an adjustable expansion sealing ring, aiming to solve the technical problem that existing sealing rings are prone to excessive expansion or deformation in unnecessary areas, leading to a decrease in sealing reliability. Specifically, it includes an inner ring and an outer ring arranged coaxially, with the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring fixedly connected. The inner ring has an annular support groove inside, and an annular support member is installed inside the support groove. The outer ring has multiple expansion chambers arranged equidistantly along the circumference of the outer ring, and each expansion chamber contains a water-swellable filler. This utility model, by providing multiple independent expansion chambers and corresponding water inlets within the outer ring, ensures that when local leakage occurs in the pipeline, only the filler near the leakage point expands through the water inlet, avoiding unnecessary deformation caused by traditional integral expansion structures and improving sealing reliability.

The utility model relates to air compressor technical field discloses a low noise air compressor, including compressor body, the top of compressor body is provided with compression pump chamber, and the top of compression pump chamber is connected with air inlet pipe and air outlet pipe, make the air form spiral guide flow before entering compression pump chamber through setting up spiral air deflector and the structure of closed column, relieve the screeching noise caused by the sudden inrush airflow, through setting up the combination structure of expansion chamber, gather together chamber and perforated pipe in the air outlet end in proper order, form the exhaust path of " expansion - contraction - expansion", effectively slow down the sound wave impact in the high pressure air sudden release process, simultaneously, the flexible bellows and perforated plate cooperation sound absorbing material are embedded in the exhaust passage, realize multistage noise reduction, the rubber sheet is clamped for buffering connection vibration in the air filter chamber and air inlet pipe junction, sets up the rubber connecting seat in the bottom, further absorbs the structural vibration in the compressor operation.

Apparatuses, kits, and methods for enhancing handling of a sample cylinder of liquified petroleum gas may include a housing, a first mounting station, and a second mounting station. The first mounting station may include a first mounting fixture connected to the housing and configured to attach to the sample cylinder, and the second mounting station may include a second mounting fixture connected to the housing and configured to attach to an expansion chamber. A first valve may provide fluid flow from the sample cylinder to a waste destination or fluid flow from a source of pressurized gas to the sample cylinder. A second valve may provide fluid flow from the sample cylinder to the expansion chamber and a third valve may provide fluid flow from the expansion chamber to a waste destination.

The present invention relates to a Flywheel Engine utilizing Flywheel with Peripheral Multiple Expanding Chambers, powered by Energies generation, each of which are used for accommodate one or more: Compressed Air, Hydrogen / generation, Water, Steam / generation, Energies Storage and Energies Supplies (CAHWSESES), creates combinations of Energies Supplies. When combining mixing of Pressurized Air and Water suppling Aeration water, integrated in hot Water / Solar Steam generation apparatuses, used for storing solar electricity or from grid electricity. moreover, combined with high pressure Air and Residual heat integrate Compressed Air with Residual Water, Hydrogen generation, using Solar PV electric and Solar Thermal energies. An innovative breakthrough technology, where the energies are channeled into peripheral expanding chambers, combined with fluid jets attached to a flywheel (CAHWS), and integrate with Electric Generator / Alternator, as well as mechanical energy output, which multiplying the energies that is exist / supplied today in the world market, defined as energies supplied from Energies Storage systems and generate various electricity and hot water generation system (e.g. about 2 times and more). Moreover, innovative Energies Storage and Energies Supplies with all mechanical systems have a lifespan of at least, 2 generations with the price lower than acid / salt batteries or lithium batteries or any other Energy storage Energy Supply, and this without the needs for chemical tanks.Innovations without the need for:1. Heat pumps for DHWS.2. Gas, Diesel, Mechanical combustion fossil Gasoline Engine and Electric diesel fuel generator.3. EV / Storage Lithium batteries.4. Mechanical elevations / lifting storage.As described above, currently available on the world market.

An inline muffler for use with a positive airway pressure (PAP) apparatus. The muffler may provide an expansion chamber with baffles that capture acoustic energy using, for instance, a disruptive gas flow path to effectively reduce downstream noise associated with a flow of pressurized gas produced by the PAP apparatus. In some embodiments, the muffler is constructed of two mostly identical halves with baffle segments being integrally formed therewith.

The application provides a silencing assembly and a scroll compressor. The silencing assembly comprises a cover, a cover fastening air inlet, and a silencing cavity constituting exhaust air; a side wall of the cover is provided with an exhaust port; at least an annular partition plate is arranged in the silencing cavity to cover the air inlet, the partition plate separates the silencing cavity into a first chamber and a second chamber which are isolated from each other; the first chamber is located at the inner side of the partition plate and is communicated with the exhaust port, and the second chamber is located at the outer side of the partition plate; the partition plate is provided with an opening which is communicated with the first chamber and the second chamber. The partition plate is arranged in the silencing cavity formed between the cover and the air inlet, a composite noise reduction structure combining resistive expansion chamber silencing and resistive interference silencing is formed, the airflow pulsation noise generated by the exhaust port of the static scroll when the compressor operates at various frequency bands can be weakened, and then the operating noise of the compressor is reduced, and the comfort is improved.

This invention discloses a wideband composite diesel engine exhaust muffler and its manufacturing method, belonging to the field of engine noise reduction technology. The muffler comprises a composite structure including a small-hole injection inlet, a two-stage series expansion chamber, a circumferentially inclined inner tube, and a resistive sound-absorbing layer. The small-hole injection pipe (3 mm diameter, 14 mm spacing) transfers low-frequency noise; the two-stage expansion chamber (volume 0.8 m³ + 1.2 m³, expansion ratio 5) and the inclined inner tube (15°–30°) synergistically optimize low-frequency noise reduction and reduce back pressure; and the resistive layer (5 cm glass wool + 2 mm porous steel plate) absorbs high-frequency noise. Experiments show that it achieves a noise reduction of 32 dB(A) at 100 Hz and a back pressure ≤2.2 kPa (3500 rpm), combining wideband noise reduction, low power loss, and high-temperature resistance. It is suitable for high-displacement diesel engines in engineering machinery, achieving efficient wideband noise reduction while reducing power loss and improving high-temperature performance.

The utility model relates to the technical field of fluid mixing, in particular to a steam-water mixing silencing ejector. The device comprises a main channel, a gas inlet and a fluid inlet, the gas inlet is located at the front end of the main channel, the rear portion of the gas inlet is fixedly connected with a nozzle and arranged in a receiving chamber, the fluid inlet is located above the main channel, and the receiving chamber is arranged at the joint of the main channel, the gas inlet and the fluid inlet. And a flow collecting chamber, a first mixing chamber, a flow dividing chamber, a second mixing chamber and an expansion chamber are sequentially arranged behind the receiving chamber. Multiple sets of first mixing blades are rotationally connected into the first mixing cavity, multiple sets of second mixing blades are rotationally connected into the second mixing cavity, the inclination angle of the second mixing blades is smaller than that of the first mixing blades, and the number of the blades is larger than that of the first mixing blades. According to the ejector, through the multi-cavity design and the arrangement of the mixing blades, steam and water are in full contact, the stirring and mixing effects are enhanced, efficient and uniform mixing is achieved, and meanwhile the noise level is effectively lowered through reasonable cavity layout and component arrangement.

The invention provides a silencing device for a pneumatic tool, which can obtain a high silencing effect. The silencer is mounted at a tool exhaust port of the pneumatic tool. The muffler device is provided with a device main body (32) and a bag body (34). The device main body has a flow path (46) extending from an opening (42) communicating with the tool exhaust port to a closed end (44), and a through path (48) penetrating the device main body in a direction intersecting the longitudinal axis (L) at a position between the opening and the closed end. The bag body has an expansion chamber (56) that communicates with the through-passage, and a vent hole that communicates the expansion chamber with the external space at a position separated from the through-passage in the longitudinal axis direction. The exhaust gas discharged from the tool exhaust port flows in the direction of the longitudinal axis in the flow path, flows into the expansion chamber through the through path in a direction intersecting the longitudinal axis, is blown toward the inner peripheral surface of the bag body, flows in the direction of the longitudinal axis in the expansion chamber, and is discharged to the outside space from the exhaust hole.

The utility model provides a gas leakage detection device for a piston ring of a mechanical piston type compressor, and belongs to the field of high-pressure hydrogen gas leakage collection and detection. The problem that after the piston ring leaks gas, the pressure change of the low-pressure side needs to be detected, and leaked gas needs to be collected is solved. The device comprises a storage cavity used for storing leaked hydrogen; the diaphragm divides the accommodating cavity into an expansion cavity and a balance cavity; and the leakage-proof indication assembly is arranged on the balance cavity, and when air leakage occurs, the diaphragm expands and pushes the leakage-proof indication assembly. The device is mainly used for leak detection and gas collection of the mechanical piston type hydrogen compressor.

A noise-reduction system for pneumatic quick release valves includes a module attachable to an exhaust outlet of an existing valve or integrated directly into a valve housing. Noise reduction may be achieved using either a single asymmetric discharge outlet or multiple outlets, depending on implementation. In various embodiments, noise reduction is achieved using expansion chambers, turbulence-generating features, or exhaust-port geometries—including single or multiple non-circular outlets—configured to disrupt coherent airflow and reduce tonal and broadband noise. Optional features include resonator cavities, micro-structured liners, perforated elements, porous or composite media, and additive-manufactured structures. The system may be implemented as a retrofit module or as part of an original-equipment valve assembly and may include sensors or diagnostic features for performance monitoring. The disclosed designs maintain required brake-system performance and durability for heavy-duty vehicle environments.

The scroll compressor comprises a compression component and a shell, the compression component is provided with an exhaust port, an exhaust cavity is defined between the shell and the compression component, the exhaust port is communicated with the exhaust cavity, the exhaust cavity is communicated with an oil separation cavity through an air outlet hole, and the oil separation cavity is communicated with the shell through the air outlet hole. The exhaust cavity comprises a plurality of expansion cavities communicated through a contraction part, the expansion cavities are sequentially arranged in the direction from the exhaust port to the air outlet hole, and the exhaust port and the air outlet hole are communicated with the corresponding expansion cavities respectively; the maximum sectional area of the contraction part is smaller than the minimum sectional area of the expansion cavity. Therefore, the exhaust cavity comprises the multiple expansion cavities which are sequentially arranged in the direction from the exhaust port to the air outlet hole, and the expansion cavities communicate with one another through the contraction parts, so that multiple times of contraction and expansion can be carried out in the process that a refrigerant flows through the exhaust cavity, and the effect of reducing the exhaust pressure pulsation of the scroll compressor can be improved; and therefore, the noise of the scroll compressor can be reduced.

The invention relates to an exhaust silencer of a pneumatic jumbolter and a working method of the exhaust silencer, and belongs to the field of noise control. Comprising an expansion chamber, a connecting sleeve, a resonant cavity, a sensor, a controller, a telescopic motor, a conical perforated plate and a porous sound absorption material, the expansion chamber telescopic section is provided with an air inlet, and the outer wall of the fixed section is provided with a telescopic motor; a through hole is formed in the connecting sleeve and is used for connecting the expansion chamber shell and the resonant cavity; the sensor is mounted on the connecting sleeve to receive and convert noise signals; the controller is installed at the top of the connecting sleeve and controls movement of the telescopic motor. The conical perforated plate is mounted in the resonant cavity to increase acoustic resistance of sound waves and reduce aerodynamic noise; and the porous sound absorption material is arranged at the tail end of the silencer, so that the silencing effect is further enhanced. The problems that in the prior art, the noise reduction effect is poor and the exhaust resistance is large due to the fact that the internal structure of a silencer is single are solved, automatic adjustment can be achieved according to the noise intensity, and the effect that the exhaust resistance is effectively reduced while noise reduction is guaranteed is achieved.

The invention relates to a device (100) for performing mechanical work and a method for operating the device (100). The device comprises at least one expansion chamber (1); and at least one mixture (2) of two miscible substances (3, 4) wherein at least one change of a state parameter (T, P), such as a temperature (T) and / or a pressure (P), influences at least one solubility of the substances (3, 4) in each other, wherein a quantity of the mixture (2) is contained in the expansion chamber (1); and at least one work unit (5) for converting the volume change work of the mixture (T, P) resulting from a change of a state parameter (T, P) into at least mechanical work.

This application discloses a rotary Stirling refrigerator, including a body and an expansion assembly disposed within the body. The expansion assembly includes an expansion cylinder and an expansion piston. The expansion cylinder has a through-hole extending radially through it, and the expansion piston has a through-channel. The through-channel has a first end and a second end opposite to each other. The first end penetrates the end of the expansion piston, and the second end penetrates the side wall of the expansion piston. The outer side wall of the expansion piston has a first through-groove communicating with the second end. The first through-groove extends circumferentially along the expansion piston, and in the axial direction of the expansion piston, the size of the first through-groove is larger than the diameter of the through-hole. Using the above-described rotary Stirling refrigerator, even when the position of the expansion cylinder deviates, the first through-groove can still correspond to and communicate with the through-hole on the expansion cylinder, achieving communication between the through-hole and the through-channel. This ensures that the gas flow rate between the expansion chamber and the compression chamber meets the requirements, thereby ensuring the stable refrigeration effect of the rotary Stirling refrigerator.

The invention relates to a self-energy arc extinguish chamber and a circuit breaker. The self-energy arc extinguish chamber comprises a first contact module, a cylinder module and a second contact module. The first contact module comprises a contact seat, a static arc contact and a static contact, wherein the static arc contact and the static contact are arranged on the contact seat. The air cylinder module comprises a cylinder barrel, a valve seat arranged in the cylinder barrel and a pull rod penetrating through the valve seat. The second contact module comprises a moving arc contact, a moving contact and an elastic piece, the moving arc contact is arranged at one end of the pull rod and is clamped with the static arc contact, the moving contact is sleeved in a first end part, close to the moving arc contact, in the cylinder barrel and is clamped with the static contact, an expansion chamber is defined by the moving contact, the first end part and the valve seat, one end of the elastic piece is arranged in the first end part, and the other end of the elastic piece is arranged in the second end part. And the other end is arranged on the moving contact. When the moving arc contact and the static arc contact are separated to generate a large amount of arc heat which flows into the expansion chamber, the elastic piece in the expansion chamber is driven to be stretched, the moving contact connected with the elastic piece rises, and the volume of the expansion chamber is increased so as to store more gas, improve the gas blowing capability and improve the breaking performance.