184 results about "Thermoacoustics" patented technology

The invention relates to the technical field of safety and environmental protection, in particular to a negative-pressure circulating explosion-control dust removal method suitable for combustible dust places, which comprises the following steps: firstly, sealing a bin body and injecting carbon dioxide-nitrogen inert gas to generate a low-oxygen environment; then, a flow guide angle-adjustable cyclone separator, a dielectric barrier discharge plasma reactor and a waste heat thermo-acoustic transducer are driven to cooperatively capture dust, and sound node amplitude synthesis capture data are obtained through compressed sensing of a microphone; inputting the environment data and the capture data into a reinforcement learning process containing a micro-thermochemistry model, and outputting instructions for adjusting negative pressure pulse, inert flow, sound field intensity and cyclone geometry; in combination with distributed radio frequency imaging data, an adversarial digital twinborn model is generated to predict explosion free energy, and automatic rollback or shutdown is carried out when the explosion free energy exceeds a threshold, so that a safe, efficient and low-energy-consumption closed loop is formed.

The invention discloses a leakage monitoring method of a sealing connection structure for hydrogen conveying, and relates to the field of gas conveying and storage monitoring, and the method comprises the steps: S1, arranging an annular negative pressure sampling cavity to collect multi-modal data, and calculating the angle section suspiciousness; s2, applying thermal pulse and sweep frequency sound wave excitation, and collecting a response signal to generate a thermoacoustic leakage score; s3, environment compensation and multi-sensor fusion are carried out to obtain an angle section hydrogen concentration time sequence; s4, obtaining an inversion flux based on the comprehensive response and sparse-smooth inversion to realize leakage positioning; and S5, calculating a risk score and performing graded alarming according to a threshold value. Multi-point detection units are arranged in the circumferential direction of the sealing connection structure, signal fusion is adopted, full-coverage leakage monitoring and high-precision positioning of the sealing structure are achieved, emergency measures are automatically triggered in combination with risk grading, and the discovery timeliness and safety are improved.

The invention discloses a combustion chamber nonlinear stability prediction method based on multi-input thermo-acoustic disturbance modeling. The method is used for evaluating thermo-acoustic stability of combustion chambers of aero-engines, gas turbines and the like. According to the method, geometric, operation and analysis parameters are input, and cooling flow distribution is calculated; solving an effective equivalence ratio, a heat release rate and a temperature field, and calculating an acoustic modal frequency; constructing an equivalence ratio and inlet flow double-disturbance MISO transfer function, and generating an FTF curve; and judging oscillation through a limit cycle detection algorithm, calling a Tanh / PowerLaw model to calculate a saturated heat release rate, and finally visually outputting a result. Multi-factor coupling accurate modeling is achieved, intervention can be conducted in the initial stage of design, calculation only needs several minutes, the prediction precision and efficiency are improved, the research and development cost is reduced, and the safety of the combustion chamber is guaranteed.

To provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibration.SOLUTION: A member 1 for a gas-liquid heat exchanger includes a body part 11 in which heat is exchanged between air introduced to inside and liquid introduced to inside, and the body part 11 has a shape of an approximately columnar body that has a first bottom surface 111 and a second bottom surface 112 disposed approximately in parallel with each other and that includes a plurality of holes 113 linearly communicating both of the bottom surfaces with each other. Gas G is introduced to the plurality of holes 113, and the plurality of holes are provided approximately in parallel in the height direction of the body part 11 (first direction D1) and are provided to form a plurality of rows along a predetermined direction approximately orthogonal to the first direction (second direction D2). The body part 11 has a shape including a plurality of slits 118 to which liquid is introduced. The slits 118 are linearly provided between the plurality of rows from one end side of the row in the body part 11 to the other end of the row of the body part 11 so as not to intersect with the holes 113.SELECTED DRAWING: Figure 1

The invention discloses a porous medium combustor adapting to a high gas velocity condition, relates to the technical field of combustors, and solves the problems that the porous medium combustor is large in fluid resistance, limited in combustion reaction area and low in heat recycling efficiency at a high gas velocity. A porous medium layer is arranged in a metal shell, a fuel premixing cavity is formed in the center of the porous medium layer, and the upper end of the fuel premixing cavity is closed; a flue gas channel is formed between the porous medium layer and the side wall of the metal shell; a diluent channel is embedded in the side wall of the metal shell and is communicated with the flue gas channel; the porous medium layer comprises a first-stage heat resistant layer, a second-stage ordered structure combustion layer and a third-stage heat recovery layer; and a telescopic ignition electrode is arranged at the bottom of the secondary ordered structure combustion layer. A radial flow structure and an ordered pore material are adopted, the pore Reynolds number of a porous medium is reduced by expanding the flow section area of the unit combustion chamber volume, a combustion reaction area is expanded, the wide stable combustion limit range can be achieved under the high gas speed condition, and thermo-acoustic oscillation is restrained.

The invention relates to the technical field of aerospace, and particularly provides a liquid metal closed-loop thermal management system and method for a hypersonic aircraft. The system comprises a liquid metal circulation loop which comprises a liquid metal pump used for driving a liquid metal working medium to circularly flow; the heat absorption device is integrated in the liquid metal circulation loop and used for receiving operation heat of the hypersonic flight vehicle and transmitting the operation heat to the liquid metal working medium flowing through the hypersonic flight vehicle. The thermo-acoustic power generation device at least comprises a hot end heat exchanger connected to the heat absorption downstream of the liquid metal circulation loop in series and used for converting part of heat energy of the liquid metal working medium heated after heat absorption into electric energy so as to drive a liquid metal pump. The liquid metal circulation loop further comprises a first diverter valve and a second diverter valve, the first diverter valve is connected into the heat absorption device, and the second diverter valve is connected into the thermo-acoustic power generation device. The dynamic cooperative controller is used for controlling the dynamic cooperative controller based on the flight state parameters of the hypersonic aircraft, the engine thrust requirement and the temperature of the key thermal protection part. The total flow of the liquid metal working medium and flow distribution in the heat absorption device and the thermo-acoustic power generation device are dynamically and cooperatively adjusted by controlling the liquid metal pump, the first diverter valve and the second diverter valve. According to the invention, the compactness of the system can be obviously improved, the heat sink consumption is greatly reduced, and a reliable and efficient heat management solution is provided for long-endurance hypersonic flight.

The invention discloses a strong premixing combustion chamber for restraining combustion noise based on a Helmholtz resonant cavity, and relates to the technical field of energy and power. Air and fuel enter the mixing cavity through corresponding connectors to be strongly premixed, premixed gas enters the hearth to be combusted through slit channels among water cooling channel branch pipes, a water cooling channel array can prevent backfire, the Helmholtz resonant cavity is connected with the hearth through a cavity neck and is provided with an air film cooling channel, the size of the Helmholtz resonant cavity needs to measure combustion noise, and a frequency spectrum is analyzed to obtain characteristic frequency. The neck length, the cross section area and the resonant cavity volume are calculated according to a Helmholtz resonance formula, and the sound absorption effect is verified in combination with a low-order thermoacoustic model. Combustion efficiency is improved through the strong premixing and slit water cooling design, tempering is prevented, NOx is reduced, the diffusion combustion problem is solved, the targeted design resonant cavity is matched with air film cooling, the defects that an existing silencing structure is large in size, poor in adaptation and low in high-temperature reliability are overcome, complex active control is not needed, cost is low, applicability is high, and the application range is wide. And cooperative control of high efficiency, low emission and unstable combustion is realized.

The utility model relates to a phase change thermo-acoustic engine experimental device which comprises a thermo-acoustic conversion system and an acoustic-electric conversion system. The thermo-acoustic conversion system comprises a sound production module and a Helmholtz resonant cavity, a ceramic plate stack soaked with water exists in the sound production module, and the stable temperature difference needed for generating the thermo-acoustic effect at the two ends of the ceramic plate stack is reduced. Sound waves generated by the thermoacoustic effect form standing waves in the Helmholtz resonant cavity, and the sound intensity is amplified; the acoustic-electric conversion system comprises piezoelectric ceramics and a triode common-emitter amplification circuit, the piezoelectric ceramics are arranged at the tail end of the resonant cavity and convert acoustic energy into electric energy, and the electric energy is amplified by the triode common-emitter amplification circuit and then drives a nixie tube to display. The experimental device integrates thermodynamics, fluid mechanics, acoustics, material science and electronic technology, has the characteristics of simple structure, low cost, rich physical process and strong exploration, is suitable for experimental teaching, particularly suitable for new engineering teaching requirements, and is beneficial to improving the multidisciplinary cross practice ability of students.

A heat engine 10, such as a gas turbine engine, has a controller 290 and a combustor, for example an afterburner combustor 120. The combustor has at least one fuel injection port 128 and at least one pilot ignition device 130. In use, the controller mitigates thermoacoustic instabilities in a gas flow, A, B within the heat engine by selectively energising the at least one pilot ignition device to ignite fuel discharged from the at least one fuel injection port. The heat engine can include a plurality of fuel injection ports radially distributed (170 Fig. 4) with respect to a centreline (9 Fig. 4) of the heat engine and can include a plurality of fuel injection ports angularly distributed (130 Fig. 4) around the centreline of the heat engine. The arrangement delivers a flame (139 Fig. 4) resulting from energisation of the at least one pilot igniting fuel discharged from the at least one fuel injection port, and the flame is blown-off across at least a part of an operating map of the heat engine. The heat engine may also include a main combustor 16.

The oil-electricity hybrid aero-engine comprises a tail nozzle and an outer duct, and further comprises a motor and an electronic cooling loop, the system comprises a thermoacoustic engine and a first thermoacoustic heat pump, the thermoacoustic engine is arranged at the tail nozzle and used for absorbing heat of tail gas at the tail nozzle, and the first thermoacoustic heat pump is arranged at the tail nozzle and used for absorbing heat of the tail gas at the outer duct. Sound power is output; the first thermo-acoustic heat pump comprises a first cold-end heat exchanger, a first heat regenerator and a first hot-end heat exchanger, the first cold-end heat exchanger is used for absorbing heat to form a low-temperature area and is used for cooling the electronic cooling loop, part of heat is transmitted to the first hot-end heat exchanger through the first heat regenerator by utilizing acoustic power, and the first hot-end heat exchanger releases heat to the outer duct. The system utilizes a thermo-acoustic energy conversion technology to enhance the cooling of electronic parts, and can also recover tail gas waste heat to convert the tail gas waste heat into heat with a higher temperature level.

The invention relates to a thermoacoustic machine (1) comprising a control device (14) configured to modulate the acoustic power generated by one or more acoustic sources (6-9) so that the temperature of an external source (2) connected to one or more thermoacoustic cells (10-13) of the machine (1) reaches or remains substantially the same as a setpoint temperature. Figure for the abstract: Fig. 1

The application provides a light emitting device, an outdoor lighting device and an optical alarm device, which comprise a resonant tube, a thermoacoustic compressor and a light emitting body. The thermoacoustic compressor is arranged at one end of the resonant tube, and the light emitting body is arranged at the other end of the resonant tube. The thermoacoustic compressor can make the gas at the position where the thermoacoustic compressor is arranged of the resonant tube vibrate, so as to generate sound waves, the sound waves propagate along the axial direction of the resonant tube, when the sound waves propagate to the position of the light emitting body, the light emitting body is driven to vibrate, and the light emitting body emits light when the light emitting body vibrates, because the light emitting body uses a mechanoluminescent material. The light emitting device provided by the application converts heat energy into mechanical energy in the form of sound waves through the thermoacoustic effect, and then drives the mechanoluminescent material to vibrate, and the mechanoluminescent material converts the mechanical energy into light through the mechanoluminescent effect. Because the light emitting device provided by the application has almost no moving parts, the light emitting device has the advantages of simple structure, high reliability and long service life.

This application discloses a gas sensor and electronic device. The gas sensor includes a substrate, a micro-hot plate, and a microphone. At least one of the micro-hot plate and the microphone is disposed on the substrate. The micro-hot plate includes a heating element, and a thermoacoustic cavity is formed around the heating element. The microphone has a sensing cavity, with the sensing surface of the microphone facing the sensing cavity, and the sensing cavity communicating with the thermoacoustic cavity. The micro-hot plate also includes a first substrate and a heat insulation layer stacked together. The first substrate has a first through-hole, and the heating element is located within the heat insulation layer. Thus, the gas sensor of this embodiment, through the coordinated operation of the micro-hot plate and the microphone, can accurately detect the composition and concentration of gas using the thermoacoustic effect. Furthermore, it is fabricated using microfabrication technology, making it easy to integrate into various micro-devices and possessing broad application prospects.

The invention discloses a combustion instability feedforward control method and system based on modal early-stage identification, and belongs to the technical field of combustion control, and the method comprises the steps: S1, collecting a multi-physical field signal in a combustion chamber in real time; s2, based on the multi-physical field signal, identifying a current dominant mode and an amplitude increasing trend of combustion instability in real time; s3, double-condition judgment is carried out, and control is triggered before the oscillation amplitude reaches a preset safety threshold value; s4, matching a corresponding open-loop feedforward control strategy from a preset control strategy library; and S5, generating and applying a modal specific control instruction to drive an execution mechanism to perform intervention. According to the combustion instability feedforward control method and system based on modal early identification, early warning and modal specific control of combustion instability are achieved, the problems of phase mismatch and non-linear inadaptation are effectively avoided, the thermo-acoustic damage risk is remarkably reduced, and the reliability of the system is improved. And the robustness, the real-time performance and the engineering applicability of the control system are improved.

The invention relates to the technical field of power generation devices, and provides a nuclear fuel built-in loop free piston thermo-acoustic generator which comprises a thermo-acoustic engine, a control drum, a neutron reflecting layer and a piston type generator, the thermo-acoustic engine comprises a low-temperature heat exchanger, a heat regenerator and a reactor core which are arranged in sequence, and the reactor core is provided with a channel for working medium gas to circulate; the control drum is arranged on the peripheral side of the thermoacoustic engine; the thermoacoustic engine and the control drum are both arranged in the neutron reflecting layer, the piston type generator is provided with a main piston air cylinder, the main piston air cylinder is in acoustic communication with the outlet end of the thermoacoustic engine through an expansion cavity side resonance tube, and the piston type generator is used for converting part of acoustic power into electric energy and adjusting the acoustic impedance phase angle. The reactor core is directly used as a heat source to be arranged in the thermoacoustic engine, so that the reactor core directly replaces a hot end heat exchanger in the traditional technology, the arrangement of a middle heat transfer structure is avoided, the structure is simple, and the problem of low heat transfer efficiency caused by the heat transfer structure is avoided.

The application discloses a structure and method for inhibiting thermal acoustic oscillation of a gas turbine combustor, relates to the field of inhibiting thermal acoustic oscillation of a gas turbine combustor, and is applied to a combustor and comprises an outer layer pipe and an inner layer pipe, wherein the inner layer pipe is located in the outer layer pipe and the inner layer pipe and the outer layer pipe are coaxial; a back cavity is formed between the inner layer pipe and the outer layer pipe; a plurality of acoustic holes are arranged on the inner layer pipe and the acoustic holes are communicated with the back cavity; the space corresponding to the acoustic holes in the back cavity is a resonance cavity; and each acoustic hole and the resonance cavity form a resonance system. The application can effectively inhibit thermal acoustic oscillation of the gas turbine combustor and reduce the influence caused by the thermal acoustic oscillation.

A hollow plate of a combustor liner defining a combustion chamber includes an inner wall having a plurality of inner openings and one or more inner holes, an outer wall having one or more outer openings and a plurality of outer holes, a plurality of side walls coupled to the inner and outer walls to define a chamber, and a partition wall coupled to the plurality of side walls and dividing the chamber into a first sub-chamber and a second sub-chamber. The one or more outer openings communicate with the first sub-chamber and with the second sub-chamber via a plurality of tubes. The plurality of inner openings communicate with the second sub-chamber and with the first sub-chamber via one or more bypass tubes. The first sub-chamber, the second sub-chamber, or both are frequency tuned to reduce combustion dynamic frequencies.

There is disclosed a thermoacoustic system. The system comprises a thermocouple junction and an electronic signal generator for generating an acoustic frequency driving signal across the junction, which causes the system to generate an acoustic wave via the Peltier effect.

The present application relates to the technical field of heat pump, in particular to a two-coupled heat pump system. The present application aims to solve the problem of low energy efficiency of the existing two-coupled heat pump. For this purpose, the two-coupled heat pump system of the present application comprises: a thermoacoustic engine comprising a cold-end heat exchanger, a first hot-end heat exchanger and a second hot-end heat exchanger; a first outdoor heat exchange part in heat exchange with the cold-end heat exchanger; a compressor in circulation communication with the first hot-end heat exchanger through a first refrigerant pipeline; a throttling element between the exhaust port of the compressor and one end of the first hot-end heat exchanger; an intermediate heat exchanger having a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path being located between the exhaust port of the compressor and the throttling element; a first indoor heat exchange part in direct or indirect heat exchange with the second hot-end heat exchanger; and a second indoor heat exchange part in heat exchange with the second heat exchange flow path. The present application can realize greater temperature span operation of the system, improve the energy efficiency and application range of the system.

This application relates to the field of non-ferrous metal processing and forming equipment technology, and discloses an extrusion processing and manufacturing equipment for non-ferrous metal sheets. Along the running direction of the non-ferrous metal sheet, it sequentially includes a continuous extrusion forming module, a thermoacoustic adaptive flutter cooling transition module, and a continuous drawing forming module. The thermoacoustic adaptive flutter cooling transition module includes a synchronous flexible track follower system and a coaxial nested independent suspended micro-forging array mounted on the synchronous flexible track follower system. The synchronous flexible track follower system is used to clamp and follow the newly extruded non-ferrous metal sheet, and the coaxial nested independent suspended micro-forging array contacts the non-ferrous metal sheet. By relying on the porous ceramic regenerator and high-pressure inert gas inside the closed-loop standing wave thermoacoustic plunger body, the massive amount of waste heat emitted from the residual thermal stress concentration area of ​​the metal sheet is directly converted into standing wave sound pressure with directional bombardment capability, allowing the micro-forging array to start spontaneously without relying on any external electromechanical vibration source.

The application provides a warning method and system for the tipping moment of a thermoacoustic system under Lévy noise, and relates to the technical field of thermoacoustic system stability analysis and early warning control, which comprises the following steps: based on the physical model of the thermoacoustic system, a non-uniform wave equation describing the pressure and velocity fluctuation of the system is constructed; the Galerkin modal expansion and Taylor expansion truncation are performed on the equation, and a random differential equation model is established by combining the time-varying control parameters and Lévy noise; the random differential equation model is solved by the Monte Carlo simulation and the random fourth-order Runge-Kutta numerical method, and the amplitude sequence of the thermoacoustic system changing with time is obtained; based on the probability distribution of the amplitude sequence, the change of the system dynamics characteristics is quantified by calculating the Shannon entropy, and the sequence of the Shannon entropy changing with time is obtained; the warning moment when the Shannon entropy sequence first passes through the preset threshold is determined, and the warning domain is generated according to the time difference between the warning moment and the actual tipping moment of the thermoacoustic system, so that the warning for the tipping moment of the thermoacoustic system is realized.

The present application relates to the technical field of heat pump, in particular to a thermoacoustic heat pump device. The present application aims to solve the problem that the application scene of the existing vapor compression heat pump is limited. For this purpose, the thermoacoustic heat pump device of the present application comprises: a thermoacoustic machine comprising a hot end heat exchanger and a cold end heat exchanger; a compressor in circulation communication with the cold end heat exchanger; a first heat exchanger, one end of which is in communication with the suction port of the compressor; a throttling element, two ends of which are respectively in communication with one end of the cold end heat exchanger and the second end of the first heat exchanger; a second heat exchanger in circulation communication with the hot end heat exchanger through a first cold carrier pipeline; a first pump body arranged in the first cold carrier pipeline; the intermediate heat exchanger has a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is communicated between the exhaust port of the compressor and the throttling element, and the second heat exchange flow path is communicated with the first cold carrier pipeline. The present application can realize the combination of the thermoacoustic machine and the vapor compression heat pump, and improve the applicability and working efficiency of the thermoacoustic heat pump device.

This application relates to the field of burner combustion control technology and discloses a burner fuel grading control optimization method. This method calculates the background noise energy during a silent monitoring period and selects the frequency of the minimum energy value as the target micro-perturbation frequency. A sinusoidal micro-perturbation signal is generated based on this frequency and superimposed on the command of the shift fuel regulating valve. Valve displacement and combustion chamber sound pressure signals are simultaneously acquired and orthogonal decoding is performed. Electromechanical transfer gain, thermoacoustic gain, and dynamic transmission phase difference are calculated and obtained. Based on the electromechanical transfer gain, it is determined whether amplitude compensation should be performed. A two-dimensional linkage verification matrix is ​​constructed by combining the time derivatives of the thermoacoustic gain and the dynamic transmission phase difference, thereby distinguishing between pure thermoacoustic mode over-limit and physical spatial anomalies, and executing the corresponding fuel grading closed-loop regulation or safety interlocking procedure. This invention eliminates valve mechanical execution errors, accurately distinguishes combustion instability conditions under strong noise backgrounds, and improves the safety of combustion system operation.

The utility model provides a thermo-acoustic power generation system which can reliably form a temperature gradient at a heat accumulator so as to improve the stability of thermo-acoustic power generation. The thermo-acoustic power generation system includes: a linear generator having a piston that vibrates within a cylinder to convert acoustic energy into electrical energy; an annular tube connected to the linear generator through the resonance tube; the prime motor is arranged in the annular pipe and comprises a cooler, a heat accumulator and a heater which are sequentially arranged, the cooler serves as a low-temperature side heat exchanger, the heater serves as a high-temperature side heat exchanger, and the heat accumulator forms a temperature gradient to generate thermo-acoustic self-excited vibration; the low-temperature side heat exchanger exchanges heat with first cooling water from the engine through a first cooling water loop, the low-temperature side heat exchanger can exchange heat with second cooling water through a second cooling water loop, and the second cooling water loop is independent of the first cooling water loop; the second cooling water is supplied to the low-temperature-side heat exchanger through the passage switching valve.

The invention relates to the technical field of heat pumps, in particular to a heat pump system. The invention aims to solve the problem that the application scene of the thermo-acoustic heat pump is relatively single. In order to achieve the purpose, the heat pump system comprises a thermo-acoustic machine, a heat exchanger and a heat pump, the outdoor heat exchanger comprises a first outdoor heat exchange part and a second outdoor heat exchange part, and heat exchange is conducted between the first outdoor heat exchange part and the cold end heat exchanger through a first secondary refrigerant; the indoor heat exchanger comprises a first indoor heat exchange part and a second indoor heat exchange part, and heat exchange is conducted between the first indoor heat exchange part and the hot end heat exchanger through a second refrigerating medium; an exhaust port of the compressor communicates with one end of the second indoor heat exchange part, and an air suction port communicates with one end of the second outdoor heat exchange part; and the two ends of the throttling element communicate with the other end of the second outdoor heat exchange part and the other end of the second indoor heat exchange part correspondingly. According to the heat pump system, the applicability of the system to different application scenes is improved, and the integration degree of the system is improved.

The present application relates to thermoacoustic engine technical field, provide a kind of phase modulation device and travelling wave thermoacoustic loop system, wherein, phase modulation device includes shell, first resonant tube and second resonant tube, and the cavity is inside in shell;First resonant tube is connected to the first end of shell and partially set in cavity, and first resonant tube entrance is set to the outside of shell, and first resonant tube outlet is set in cavity and is communicated with cavity;Second resonant tube is connected to the second end of shell and partially set in cavity, and second resonant tube outlet is set to the outside of shell, and second resonant tube entrance is set in cavity and is communicated with cavity.The phase modulation device of the present application is used for the phase modulation of travelling wave thermoacoustic loop system, by partially setting first resonant tube and second resonant tube inside cavity, the volume of phase modulation device is reduced, and the compactness of phase modulation device is improved;The pressure difference between the inside and outside of the pipe wall of first resonant tube and second resonant tube located in cavity is small, and the thickness of pipe wall can be reduced, and material is saved.

The invention relates to a thermo-acoustic combustion system (100) and a combustion and energy exchange apparatus (500) in the form of an L-shaped tube, for eliminating pests and undesirable vegetation. The combustion and energy exchange apparatus (500) comprises the thermo-acoustic combustion system (100), and a vaporizing system (200) comprising a dispersing trough (215). The thermo-acoustic combustion system (100) comprises a combustion chamber (120) housed in a vertical part of the L-shaped tube (105). The horizontal part of the L-shaped tube (205) is open at the bottom so that the emitted vapor reaches the ground and the vegetation to be eliminated. In the vertical part of the L-shaped tube (105), a reinforcing strap (108), a connecting element (50) and a fastening element (51) are provided for connecting the combustion and energy exchange apparatus (500) to a tractor or agricultural implement.

The invention relates to the technical field of heat pumps, in particular to a heat pump system. The problem that the application scene of the thermo-acoustic heat pump is single is solved. To this end, the heat pump system of the present application comprises: a thermo-acoustic machine having a cold-end heat exchanger and a hot-end heat exchanger; the first outdoor heat exchange part exchanges heat with the cold end heat exchanger through a first secondary refrigerant; an exhaust port of the compressor communicates with one end of the indoor heat exchanger, and an air suction port communicates with one end of the second outdoor heat exchange part; two ends of the throttling element are respectively communicated with the other end of the indoor heat exchanger and the other end of the second outdoor heat exchange part; and the intermediate heat exchanger is provided with a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path exchanges heat with the hot end heat exchanger through a second secondary refrigerant, and the second heat exchange flow path exchanges heat with a refrigerant between the indoor heat exchanger or the exhaust port of the compressor and the throttling element. The advantages of the thermo-acoustic machine and the compressor can be exerted, and the applicability of the system to different application scenes is improved.

The invention relates to the technical field of heat pumps, in particular to a dual heat supply pump system. The invention aims to solve the problem of low energy efficiency of the existing steam compression cycle dual heat supply pump in a low-temperature environment. To this end, the heat pump system of the present application comprises: a thermo-acoustic machine having a cold-end heat exchanger and a hot-end heat exchanger; the first outdoor heat exchange part exchanges heat with the cold end heat exchanger through a first secondary refrigerant; the dual-purpose heat exchanger directly or indirectly exchanges heat with the hot end heat exchanger through a second refrigerating medium; the intermediate heat exchanger is provided with a first heat exchange flow path and a second heat exchange flow path, and the first heat exchange flow path exchanges heat with the dual-purpose heat exchanger; an exhaust port of the compressor communicates with one end of the second heat exchange flow path, and an air suction port communicates with one end of the second outdoor heat exchange part; the two ends of the throttling element communicate with the other end of the second heat exchange flow path and the other end of the second outdoor heat exchange part correspondingly. Different operation modes can be selected based on different application scenes, and the operation energy efficiency of the system is improved.

An underwater sound generation device may be used for effective control of algae and other microorganisms in ponds and lakes. The sound projector may comprise a thermoacoustic sound transducer and an electronic unit for controlling the operation of the projector. The thermoacoustic projector may include a freestanding carbon nanotube (CNT) film encapsulated between two vibrating plates. The inert gas filled thin acoustical cavity provides a piston-type displacement of the plates and supports a high-temperature operation. A power supply driver, controlling the operation of the sound radiating system, may include a pulse generator, high-power switch amplifier, and a cable, connecting the projector with an electronic driver. The sound control system may provide an omnidirectional sound pressure level in a wide frequency range to affect the algae growth ecosystem over large distances.