1316 results about "Working fluid" patented technology

Heat exchangers for cryogenic fuel distribution systems and related methods are disclosed herein. An example aircraft disclosed herein includes a cryogenic fuel system including a cryogenic fuel, a hydraulic system including a hydraulic fluid, a gas turbine engine fluidly coupled to the cryogenic fuel system, and a heat exchanger fluidly coupled to the cryogenic fuel system, the heat exchanger is used to exchange heat between the cryogenic fuel and at least one of (1) hydraulic fluid or (2) working fluid thermally coupled to the hydraulic system.

A flow direction control device of heating stream and cooling stream is prepared as connecting said device separately to the first heat exchange unit, the second heat exchange unit, air conditioner and compressor for controlling heated working fluid from the first heat exchange unit to be sent to air conditioner for being used as the first heat media or to be sent to the second heat exchanger for being condensed there then to send it to air conditioner for being used as the second cooling media in order to make air conditioner output hot and cold alternatively, enabling to set heating course on the first heat exchange unit for providing the third heat media out.

The invention belongs to the technical field of refrigeration and heat dissipation of phase change materials, and particularly relates to a heat pipe heat dissipation device and an outdoor unit. The heat dissipation device comprises a first evaporation part, a condensation part, a gas collecting pipe and a liquid collecting pipe; the gas collecting pipe and the liquid collecting pipe are distributed at the upper end and the lower end of the first evaporation part and the upper end and the lower end of the condensation part, the first evaporation part, the condensation part, the gas collecting pipe and the liquid collecting pipe jointly form a closed circulation channel, natural circulation of evaporation, transmission, condensation and backflow of a working medium is completed through the thermosyphon effect, and therefore heat dissipation of a heating element is achieved. Through structural optimization of the heat pipe heat dissipation device, the self-circulation characteristic of a working medium in the evaporation, condensation and backflow processes is fully utilized, and the heat pipe heat dissipation device has the advantages of being free of external power, high in heat dissipation efficiency, compact in structure, high in reliability and the like and is suitable for application scenes such as outdoor units with limited space and high heat dissipation requirements.

A combination heat dissipation structure includes a vapor chamber and at least one heat pipe. The vapor chamber defines an airtight chamber filled with a working fluid and provided with first and second wick structures. The vapor chamber further includes at least one through hole formed on its upper wall and communicable with the airtight chamber, and annular elements provided in the airtight chamber corresponding to the through hole to contact with the first and second wick structures. The heat pipe has an open end inserted into the airtight chamber to contact with the first wick structure, such that the heat pipe is axially supported and located by the annular elements. With these arrangements, a flow-back path between the vapor chamber and the heat pipe is largely shortened to avoid dry burning in the vapor chamber and upgrade the two-phase heat exchange efficiency of the vapor chamber.

A hydraulic drive apparatus includes a hydraulic pump that discharges a working fluid; a flow dividing valve that divides a pump passage connected to the hydraulic pump into first and second passages, and changes an opening degree of each passage according to a signal that is input to the flow dividing valve; a travel system hydraulic circuit that is connected to the first passage and controls a flow of the working fluid to a travel motor; a loading system hydraulic circuit that is connected to the second passage and controls a flow of the working fluid to a loading actuator; a pressure sensor that detects a pressure supplied to the travel motor; and a control device that controls, by outputting the signal to the flow dividing valve, the opening degree of the first and second passages according to the pressure detected by the pressure sensor.

A combined heat dissipation structure includes a vapor chamber and at least one heat pipe. The vapor chamber includes an upper plate and a lower plate. A plate chamber is defined between the upper and lower plates. A first wick structure and a working fluid are provided in the plate chamber. The upper plate has at least one through hole communicating with the plate chamber and an annular flange protruding from the through hole toward the upper plate. The annular flange has a first positioning portion. The heat pipe has two ends defined as a closed end and an open end. A second positioning portion is formed on the heat pipe close to the open end. The second positioning portion is engaged with the first positioning portion, so that the heat pipe and the vapor chamber can be combined quickly, accurately.

The embodiment of the invention discloses an ultrahigh compression ratio adjustable ejector and a variable working condition performance optimization design method thereof. The adjustable ejector comprises a nozzle, an adjusting cone, a suction chamber, a mixing chamber and a diffusion chamber, wherein working fluid is introduced into the nozzle, the adjusting cone is arranged at the throat part of the nozzle, and the fluid to be ejected is introduced into the suction chamber; the adjusting cone is formed by alternately and repeatedly connecting cylindrical surface sections and conical surface sections, and the adjusting cone can axially move; the method comprises the steps that the pressure of working fluid input into the adjustable ejector is monitored; when the pressure of the working fluid is changed between the first pressure and the second pressure, the adjusting cone is axially moved, and each cylindrical surface section directly faces the throat part in sequence, so that step type adjustment of the pressure of the working fluid is realized; when the pressure of the working fluid is changed between the second pressure and the fourth pressure, the adjusting cone is axially moved, and each conical surface section directly faces the throat part in sequence, so that the continuous adjustment of the pressure of the working fluid is realized; the mass flow of the ejected fluid in the adjustable ejector belongs to a preset range; the first pressure, the second pressure, the third pressure and the fourth pressure are gradually increased in sequence.

A combination heat dissipation structure includes a vapor chamber and at least one heat pipe. The vapor chamber defines an airtight chamber filled with a working fluid and provided with first and second wick structures. The vapor chamber further includes at least one through hole formed on its upper wall and communicable with the airtight chamber, and annular elements provided in the airtight chamber corresponding to the through hole to contact with the first and second wick structures. The heat pipe has an open end inserted into the airtight chamber to contact with the first wick structure, such that the heat pipe is axially supported and located by the annular elements. With these arrangements, a flow-back path between the vapor chamber and the heat pipe is largely shortened to avoid dry burning in the vapor chamber and upgrade the two-phase heat exchange efficiency of the vapor chamber.

The invention discloses a device and a method for simulating heat exchange and friction resistance measurement of an aviation high-speed motor under different working conditions, and relates to the field of heat management of high-speed rotating equipment. An additional heating sheet is attached to the outer surface of the inner rotor, and different surface structures are detachably assembled on the outer rotor to form a stator and rotor slit flow channel boundary; cooling liquid forms one-inlet and one-outlet forced convection through the radial through hole of the end cover. The rotating speed larger than or equal to 20,000 rpm, runner pressure drop and temperature data are synchronously collected through an axle load type sensor, and the heat exchange coefficient, the flow resistance coefficient and the friction resistance coefficient are calculated in real time based on energy conservation, a Darcy formula and a torque empirical formula. A real rotor surface structure is reproduced under the condition of high-speed rotation, working medium leakage is restrained through mechanical sealing, and runner blockage caused by centrifugal deformation of the surface structure is prevented through the outer rotor designed in an integrally-formed mode; the obtained convective heat transfer-resistance coefficient-friction resistance coefficient all-parameter curved surface database can guide optimization of the cooling flow channel of the aviation motor.

The valve device comprises a driving assembly, a valve seat assembly, a diaphragm and a valve element assembly, the valve seat assembly is fixedly connected with the driving assembly, the valve seat assembly is provided with a valve port, the driving assembly is in transmission connection with the valve element assembly, the valve element assembly can axially move to open or close the valve port, and the diaphragm is arranged in the valve element assembly in the axial direction of the valve device. At least part of the diaphragm is arranged between the driving assembly and the valve seat assembly; the valve device is provided with a liquid inlet cavity and a balance cavity, the valve element assembly is provided with a balance channel, the balance channel is communicated with the balance cavity and the liquid inlet cavity, the wall part limiting the mounting hole and the valve element assembly are arranged in a sealed mode, and the diaphragm limits part of the wall part of the balance cavity. Part of the working fluid can enter the balance cavity through the balance channel, and the driving force of the valve device can be reduced.

The invention relates to a heat transfer system (10) with a heat source (14) and a heat sink (50), wherein the heat source (14) has a heat discharge arrangement (34) for heat discharge from the heat source (14) by means of a working fluid (12), wherein within the heat discharge arrangement (34) the working fluid (12) can be thermally coupled or coupled to the heat source (14), and wherein by means of the working fluid (12) the heat source (14) can be thermally coupled or coupled to the heat sink (50).A high and defined heat transfer over a large operating temperature range can be achieved by the heat transfer arrangement (34) comprising at least two stages arranged parallel in terms of flow, a first stage (36) and a second stage (42), for heat transfer from the heat source (14) to the working fluid (12), wherein the stages (36, 42) are designed such that they have a different thermal resistance between the heat source (14) and the working fluid (12).

A shock absorber includes a first passage through which a working fluid flows from one chamber in a cylinder due to movement of a piston, a second passage which is provided in parallel with the first passage, a disk which is provided in the first passage and generates a damping force, a spool member, having a tubular shape, which is capable of changing a biasing force against the disk by moving in an axial direction, a pilot chamber which is provided in the second passage, located on an inner peripheral side of the spool member, and generates a biasing force against the disk in the spool member, and a closing member which blocks a flow of the working fluid from the pilot chamber to the other chamber and is provided to be movable with respect to the spool member.

A cooling system includes a liquid loop, a vapor compression loop, and a heat exchanger in fluid communication with each of the liquid loop and the vapor compression cycle loop. The liquid loop includes a cold sink for cooling a heat load. The vapor compression cycle loop is fluidly coupled to the liquid loop by a separator, which is configured to separate a two-phase form of a working fluid received from the cold sink into a vapor form of the working fluid and a liquid form of the working fluid.

A HVAC&R system includes a heat pump configured to selectively circulate a working fluid. The heat pump includes an outdoor heat exchanger, an indoor heat exchanger, a compressor, a reversing valve configured to direct the working fluid from the compressor to the outdoor heat exchanger or to the indoor heat exchanger, and a controller. The controller is configured to determine whether a pressure of the working fluid exiting the compressor exceeds a pressure threshold, and, in response to determining that the pressure of the working fluid exiting the compressor exceeds the pressure threshold, control the reversing valve to block the working fluid from flowing from the compressor through the reversing valve to the outdoor heat exchanger.

A compressor includes a housing, a first compression mechanism and a second compression mechanism disposed in the housing, and a housing cover fixed to the housing. Both the first compression mechanism and the second compression mechanism are configured to compress a working fluid from a suction pressure to a discharge pressure. The first compression mechanism includes a first cylinder housing having a first fluid storage plenum. The second compression mechanism includes a second cylinder housing having a second fluid storage plenum. The housing cover defines an intermediate-fluid port in fluid communication with the first fluid storage plenum via a first intermediate-fluid passage and the second fluid storage plenum via a second intermediate-fluid passage. Working fluid at an intermediate pressure enters the intermediate-fluid port. The intermediate pressure is greater than the suction pressure and less than the discharge pressure.

The invention discloses a thermal power generating unit coordination control data and mechanism hybrid modeling method and device, computer equipment and a computer readable storage medium, and relates to the technical field of thermal energy engineering and power system modeling and control. Establishing a high-precision dynamic mechanism model of the working medium flow and heat transfer process of the boiler-steam turbine system; then, constructing an error correction model fusing the long-short-term memory network, the convolutional neural network and residual connection; and finally, fusing the mechanism model and the error correction model through parallel computing to form a dynamic hybrid model with physical interpretability and high precision. Through the hybrid modeling strategy, the prediction accuracy of key parameters such as the main steam pressure, the separator outlet steam enthalpy value and the unit load in the wide load range, especially under the dry-state operation working condition is remarkably improved, and a reliable model basis is provided for designing an advanced unit coordination control system.

The invention discloses a circulating device. The circulating device comprises a material barrel, an infusion pump and a return pipe, and the material barrel is filled with working fluid; the lower part, with a liquid inlet, of the infusion pump is inserted into the charging basket and is positioned below the liquid level; a liquid outlet is formed in the upper part of the infusion pump; one end of the backflow pipe is communicated with a liquid outlet of the infusion pump, the other end of the backflow pipe is connected with the side wall of the bottom of the material barrel and communicated with the interior of the material barrel, and at least one part of liquid pumped by the infusion pump enters the bottom of the material barrel through the backflow pipe. According to the circulating device, the pumped-out machining liquid flows into the bottom of the material barrel through the backflow pipe, so that the machining liquid in the bottom of the material barrel is in a flowing state, the probability that the machining liquid at the bottom of the material barrel settles is reduced, the bottom settling phenomenon is reduced, and the machining effect and the product machining yield are improved.

An assembly includes a fluid conditioning system including a cascade module and an active charge compensator integrated into the fluid conditioning system. The fluid conditioning system is transformable between a first mode and a second mode. In the first mode, the fluid conditioning system includes a first vapor compression loop and a second vapor compression loop. The first vapor compression loop and the second vapor compression loop are thermally coupled at the cascade module and the second vapor compression loop is fluidly separate from the first vapor compression loop. In the second mode, the fluid conditioning system includes a single vapor compression loop. The active charge compensator is operable to control a working fluid charge within the fluid conditioning system based on the mode of operation selected from the plurality of modes.

An oil-free compressor includes a compressor housing with a suction inlet and a discharge outlet, a compression mechanism and a liquid-vapor separation volume disposed within the compressor housing, a crankshaft. The compression mechanism has an inlet fluidly connected to the suction inlet and a discharge volume fluidly connected to the discharge outlet. The crankshaft is engaged with the compression mechanism. The liquid-vapor separation volume is configured to separate a mixed phase of working fluid into liquid working fluid and gaseous working fluid. The liquid working fluid is supplied to the bearing. A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a refrigerant circuit with an oil-free compressor, a condenser, one or more expanders, and an evaporator.

Heat exchangers for cryogenic fuel distribution systems and related methods are disclosed herein. An example aircraft disclosed herein includes a cryogenic fuel system including a cryogenic fuel, a hydraulic system including a hydraulic fluid, a gas turbine engine fluidly coupled to the cryogenic fuel system, and a heat exchanger fluidly coupled to the cryogenic fuel system, the heat exchanger to exchange heat between the cryogenic fuel and at least one of (1) the hydraulic fluid or (2) a working fluid thermally coupled to the hydraulic system.

The present disclosure provides a solution for a system and a method for converting heat into work. The solution makes use of a nozzle, in which pressurized heat transfer liquid (HTL) and a Liquid-Vapor-Phase-Changing (LVPhC) working fluid is about the same pressure are mixed to form a LVPhC-HTL mixture, which in turn undergoes evaporation and isothermal or quasi-isothermal expansion while flowing in the nozzle that results in acceleration of the mixture. The accelerated mixture is ejected from to thereby rotate a turbine and produce work from the generated kinetic energy. The LVPhC is separated from the mixture and condensed after its ejection from the nozzle and its pressure is elevated back to the working pressure in the nozzle. The present solution exploits the thermodynamic advantages of each phase of the LVPhC.

A device and related method that provides, but is not limited thereto, a two-phase heat transfer device with unique combination of enhanced evaporation and increased cooling capacity. An advantage associated with the device and method includes, but is not limited thereto, increased cooling capacity per unit area, controlled and optimized evaporation, prevention of boiling, and prevention of drying of the evaporator. An aspect associated with an approach may include, but is not limited thereto, using a non-wetting coating or structure to keep working fluid away from the spaces between elongated members of an evaporator and using a wetting coating or structure to form thin films of working fluid around the distal region of the elongated members. For example it can be used to cool a computer chip, a skin of a hypersonic flying object, parabolic solar collector, turbine or engine blade, or any other heat source that requires high heat flux.

The present disclosure in some embodiments provides an oil reservoir assembly for a vehicle, the assembly comprising: a first oil reservoir formed with an outlet; a second oil reservoir spaced apart from the first oil reservoir in a lateral direction and in front of the vehicle, in fluid communication with a master cylinder, and having an inlet; a connecting member connecting the outlet and the inlet to convey a working fluid from the first oil reservoir to the second oil reservoir and a first rib located inside the second oil reservoir, extending from an upper surface of the second oil reservoir and parallel to a longitudinal direction of the vehicle, and extending in a first direction of the inlet.

A three-dimensional vapor chamber assembly structure includes a housing, heat pipes, a capillary member and a working fluid. The housing includes a first housing plate and a second housing plate, a cavity formed between the first and second housing plates, and through holes formed on the second housing plate. The heat pipe penetrates through the through holes and includes an open end having a flange formed thereon. The flange includes lateral and longitudinal surfaces. The lateral surface of the flange is attached to the second housing plate via a welding layer, and the longitudinal surface of the flange is attached to the second housing plate via a welding product. The capillary member is arranged inside the cavity and attached to the housing. The working fluid is arranged inside the cavity. Accordingly, a firm and robust vapor chamber structure capable of preventing welding material from entering the cavity is achieved.

A suspension system includes: a variable damper configured to use a damping force variable actuator to adjust communication of working fluid generated in a passage by a relative movement between a vehicle body and a wheel, to thereby adjust a damping force over a range of a soft characteristic to a hard characteristic; and a controller configured to control the damping force variable actuator. The variable damper further includes a frequency response unit configured to reduce the damping force for vibration at a specific frequency. The controller is configured to increase a change rate from a soft side to a hard side at a time of controlling the damping force to reach a target damping force when a frequency of the relative movement between the vehicle body and the wheel is lower than a first frequency set to the frequency response unit.

A heat exchanger including a body containing a working fluid and including a first manifold and a second manifold; at least one internal partition being arranged in the body to form at least two internal channels, each internal channel being in fluid communication with the first manifold and with the second manifold; the body being intended to be thermally coupled to a cold source at a first part and to a hot source at a second part, the first part and the second part being connected by an elbow part; and wherein each internal channel has a cross-section in which the dimensions are adapted so that the working fluid contained in the internal channel has an Eötvös number Eo that is less than or equal to 2.

A working fluid circulates through a heat pump cycle in a first direction. Heat is transferred from a first environment to a working fluid. The working fluid is pressurized by a compressor. Heat is transferred from the working fluid to a second environment different from the first environment. A first portion of the working fluid is flowed through a throttle valve. A second portion of the working fluid is flowed to a turbine wheel of a flow-through electric generator. Electrical power is generated by the generator in response to the second portion of the working fluid flowing across the turbine wheel. The working fluid can circulate through the heat pump cycle in a second direction opposite the first direction. Regardless of whether the working fluid flows through the heat pump cycle in the first or second directions, impellers of the generator rotate in the same direction.

A three-dimensional vapor chamber assembly structure includes: a housing including a first housing plate and a second housing plate, an accommodation chamber is formed between the first housing plate and the second housing plate, the second housing plate has penetrated holes, and a recessed slot is respectively formed at an outer circumference of the penetrated holes; a plurality of heat pipes correspondingly disposed in the penetrated holes, the heat pipes has an open end, the open end has a flange, the flange is disposed in the recessed slot, the heat pipe is combined with the second housing plate via a welded layer on the flange and the recessed slot; a capillary structure disposed in the accommodation chamber and attached on the housing and a working fluid is disposed in the accommodation chamber. Accordingly, a welding material is prevented from entering the accommodation chamber.

Provided is a switching valve capable of maintaining a satisfactory contact state between a contact surface of a rotor and a seat surface of a stator in a rotation range of the rotor. A stator is provided with a plurality of inlet ports and outlet ports through which a working fluid passes, a rotor is provided with at least two through-holes and communication grooves which are able to selectively communicate between the inlet ports and the outlet ports, a casing is provided with a fluid inlet opening which communicates with each of the through-holes, and at least one of the through-holes always communicates with any of the outlet ports of in a rotation range of the rotor.

The invention provides a supercritical carbon dioxide power generation working medium pressure adjusting system, belongs to the technical field of power generation system working medium pressure adjusting, and can at least partially solve the problems that in the existing unit start-stop and load adjusting process, the system pressure is greatly changed, normal operation of a unit is affected, and the working efficiency is low. The system comprises a power generation module, and the power generation module comprises a compressor and a heat regenerator connected with the compressor through a pipeline; the carbon dioxide working medium circulating system is provided with the gas storage tank, part of the carbon dioxide working medium is stored in the gas storage tank through the differential pressure of the high-pressure part and the low-pressure part of the circulating system, the working quality of the circulating system is adjusted, and the carbon dioxide working medium circulating system has the advantages of being simple and convenient to operate.