31 results about "Inertance" patented technology

An inertance tube and a surge volume for a pulse tube refrigerator system may be integrally coupled together, such as by the inertance tube being at least in part a channel in a wall of the surge volume. The surge volume may have a helical channel in an outer wall that forms part of the inertance tube. The surge volume tank may be surrounded by a cover that closes off the channel to form the inertance tube as an integral part of the surge volume. The inertance tube may have a non-circular cross section shape, such as a square shape or non-square rectangular shape. The channel may be tapered, perhaps changing aspect ratio. Alternatively, the inertance tube may be a separate tube having a non-circular shape, which may be wrapped around at least part of the surge volume.

The performance of a multi-stage inertance pulse tube cryocooler in accordance with an embodiment of the present invention may be enhanced by cooling the inertance tube of one stage placing it in thermal communication with the cool heat exchanger of a preceding stage. Cooling at least one inertance tube of a multi-stage cooler in this invention lowers the viscosity and sound speed of the gas in the inertance tube, thereby improving the cooling power for that subsequent cooling stage, and for the entire device.

The liquid ejection head comprises: a nozzle through which liquid is ejected; a pressure chamber which stores the liquid ejected through the nozzle; a pressurizing device which changes a volume of the pressure chamber to apply pressure to the liquid stored in the pressure chamber; and a supply port through which the liquid is supplied to the pressure chamber, wherein the liquid ejection head has a structure such that inertance Mn of the nozzle, liquid resistance Rn of the nozzle, compliance Cn caused by a surface tension of the liquid in the nozzle, inertance Ms of the supply port, and liquid resistance Rn of the supply port satisfy the following inequality: $\frac{4·\left(\mathrm{Mn}+\mathrm{Ms}\right)}{\mathrm{Cn}}\le {\left(\mathrm{Rn}+\mathrm{Rs}\right)}^2,$

so that oscillation of a meniscus surface located in vicinity of the nozzle is controlled at a time of refill when the liquid is filled in the pressure chamber through the supply port after the liquid is ejected from the nozzle.

A fluid jet device being provided with a fluid jet aperture section and producing a jet of fluid from the fluid jet aperture section includes: a pulsation generation section including a fluid chamber whose capacity can be changed, an inlet fluid path linked through the fluid chamber with a volume smaller than that of the fluid chamber, and an outlet fluid path linked through the fluid chamber and the fluid jet aperture section with an inertance set smaller than that of the inlet fluid path; and a pressure generation section that supplies the fluid to the inlet fluid path.

A liquid droplet ejection apparatus comprises: a nozzle from which a liquid droplet is ejected; a pressure chamber filled with liquid to which a pressure is applied in order to eject the liquid in a form of the liquid droplet from the nozzle; and a supply port which supplies the liquid to the pressure chamber, wherein inertance Mn of the nozzle, resistance Rn of the nozzle, compliance Cn of a nozzle section due to surface tension, inertance Ms of the supply port, and resistance Rs of the supply port satisfy the following two formulas: $\frac{1}{\mathrm{Mn}+\mathrm{Ms}}\sqrt{\frac{\mathrm{Mn}+\mathrm{Ms}}{\mathrm{Cn}}-\frac{{\left(\mathrm{Rn}+\mathrm{Rs}\right)}^2}{4}}>\pi f-\frac{\mathrm{Rn}+\mathrm{Rs}}{2\left(\mathrm{Mn}+\mathrm{Ms}\right)}\times \frac{1}{f}<\log 0.01.$

A CPAP apparatus in which the swing in pressure at the patient interface is adjusted by regulating the air flow from the flow generator through an air delivery conduit taking into account a pressure drop representative of the inertance of the airflow in the air delivery conduit during the increase of air flow from the flow generator.

An improved pulse tube cooler having a resonator tube connected in place of a compliance volume or reservoir. The resonator tube has a length substantially equal to an integer multiple of ¼ wavelength of an acoustic wave in the working gas within the resonator tube at its operating frequency, temperature and pressure. Preferably, the resonator tube is formed integrally with the inertance tube as a single, integral tube with a length approximately ½ of that wavelength. Also preferably, the integral tube is spaced outwardly from and coiled around the connection of the regenerator to the pulse tube at a cold region of the cooler and the turns of the coil are thermally bonded together to improve heat conduction through the coil.

A liquid-jet head comprising a pressure generating chamber, which is supplied with a liquid via a liquid supply path and in which a nozzle orifice for jetting the liquid is formed, and a pressure generator for causing a pressure change within the pressure generating chamber, wherein when an inertance and a passage resistance of the liquid supply path are designated as M₁ and R₁, respectively, and an inertance and a passage resistance of the nozzle orifice are designated as M₂ and R₂, respectively, relationships M₂<M₁ and R₂>2×R₁ hold.

The invention discloses a compact coupled inertance tube type high-frequency coaxial pulse tube refrigerator and a manufacturing method thereof. The refrigerator is composed of a main base, an auxiliary base, a special-shaped compressor base, opposed linear-compressor main components, a left compressor shell, a right compressor shell, a compressor connecting tube, a main heat exchanger, an auxiliary heat exchanger, a regenerator, a pulse tube, a cold-end heat exchanger, a vacuum housing, a pulse tube connecting tube, an inertance tube, an air reservoir and a protective housing. Structural features of a coaxial pulse tube refrigerator, an inertance tube phase modulation device and a linear compressor can be given into full play, compactness and high reliability of an overall system are realized, and it is of important significance to practicability of the coaxial pulse tube refrigerator in the special fields such as aerospace.

The invention discloses a cryogenic thermo-acoustic refrigerator without an inertance tube or an air reservoir. The cryogenic thermo-acoustic refrigerator without the inertance tube or the air reservoir comprises refrigeration units which respectively consist of a pressure wave generating device and a refrigerator component; the number of the refrigeration units is an even number or three; each refrigerator component comprises a heat regenerator hot-end heat exchanger, a heat regenerator, a cold-end heat exchanger, a pulse tube, a pulse tube hot-end heat exchanger, a small hole regulating valve and a two-way intake regulating value, wherein the heat regenerator hot-end heat exchanger, the heat regenerator, the cold-end heat exchanger, the pulse tube, the pulse tube hot-end heat exchanger and the small hole regulating valve are connected with the output end of the pressure wave generating device of each refrigeration unit in sequence, and the two-way intake regulating value is arranged on a two-way intake tube connected between the output end of the pressure wave generating device of each refrigeration unit and the outlet end of the corresponding pulse tube hot-end heat exchanger; the small hole regulating valves of all the refrigeration units are connected through connecting tubes; when the refrigerator works, by controlling the phase of each pressure wave generating device to generate pressure waves, the sum of volume flow rates of the joints of all the small hole regulating valves is close to zero so as to enable the flow losses of the pressure waves in the heat regenerators to reach a minimum. As the refrigerator is not provided with the air reservoir or the inertance tube, the refrigerator has the advantages of being compact in structure and high in power density.

The invention discloses a variable-inertance and variable-damping damper. The variable-inertance and variable-damping damper comprises a variable-inertance assembly and a variable-damping assembly; the variable-inertance assembly comprises a rotating shaft, an inertance sleeve, an inertance piston rod and an inertance supporting rod, wherein the inertance sleeve is arranged on the end part of therotating shaft; the inertance piston rod is vertical to the axial direction of the rotating shaft and is arranged in the inertance sleeve; the inertance supporting rod is vertical to the axial direction of the inertance piston rod and is arranged on the end part of the inertance piston rod; the end part of the inertance supporting rod is connected with an inertance mass block; the variable-inertance assembly comprises an angle adjusting device which is used for adjusting the angle between the inertance supporting rod and the rotating shaft; the variable-damping assembly comprises an outer cylinder barrel, a left end cover, a right end cover, a left side disk, a right side disk, a damping exciting coil and magnetorheological fluid; the left side disk and the right side disk are arranged ina mounting cavity; the damping exciting coil is arranged in the mounting cavity; and the cavity is filled with the magnetorheological fluid; and the variable-inertance and variable-damping damper of the technical scheme combines a semi-automatic magnetorheological fluid technology with an active control technology so as to realize stepless variable-inertance and variable-damping adjustment and improve the damping effect.