44results about How to "Reduce outflow resistance" patented technology

The invention discloses a reversing valve device. A first opening on a valve body is used for being communicated with a colorant container while a second opening on the same is used for being communicated with an injection pump, a valve core is arranged in an internal valve cavity of the valve body in a pivoted manner, an internal passage and a first colorant injection hole are arranged on the valve core, the internal passage is communicated with the second opening of the valve body, one end of the first colorant injection hole is communicated with the internal passage while the other end of the same is arranged on the peripheral surface of the valve core, a third opening on the valve body is formed on the inner wall of the internal valve cavity, a first passage is communicated with the first opening and the third opening, a fourth opening is formed on the lower end face of the valve body and communicated with the internal valve cavity, the first colorant injection hole can switch working positions along with rotating of the valve core, and the first colorant injection hole is exposed out of the fourth opening when being at a first colorant injection working position and communicated with the third opening when being at a non-colorant-injection position. By structural optimization, the phenomenon that colorant appears at a colorant outlet can be completely avoided. On the basis, the invention further provides a color mixer with the reversing valve device.

The invention discloses an internal waverider-derived high supersonic inlet duct, the shapes of the inlet and outlet of which can be customized, and a design method thereof. The structure of the internal waverider-derived high supersonic inlet duct comprises an inlet duct contraction section and an isolated section, wherein the shape of the inlet duct contraction section is in three dimensional inward contraction. The design method is that a non-axisymmetric internal contraction basic flow field is taken as the base, the non-axisymmetric internal contraction basic flow field comprises an axisymmetric internal contraction rotary wall surface and a non-axisymmetric variable radius central body, wherein the axisymmetric internal contraction rotary wall surface keeps no changing, and the radius of the central body is adjustable. The invention has the advantages that the internal waverider-derived high supersonic inlet duct can capture the inflow by full flow and has low Mach number automatic overflow; the shapes of the inlet and the outlet can be customized according to the layout requirement, and the parallel module installation or the integrated design with various aircrafts can be easily realized.

The invention provides an internal waverider-derived high speed inlet considering both internal flow performance and external flow performance and a design method thereof. The structure of the high speed inlet consists of a contraction section, an insulation section or an expansion section, wherein the contraction section of the high speed inlet is characterized by adopting three-dimensional inward contraction of a smooth curved surface. High speed incoming flow forms a curved surface shockwave at the inlet to close the inlet completely so as to realize that the inlet 'rides' on shockwave without overflow completely. The design method is to carry out flow line tracing by using a specific non-axisymmetric internally contracted basic flow field as a base to obtain downstream flow surface according to the given inlet shape, thereby obtaining a three-dimensional moulding surface of the internal waverider-derived high speed inlet. The non-axisymmetric internally contracted basic flow field can be obtained through performing gradual change based on the prior revolution surface along a circumferential contracting surface, and arranging a cylinder with specific radius on the axes. The internal waverider-derived high speed inlet and the method have the advantages that external flow resistance can be reduced more while ensuring high quality of internal flow, wide range of working mach number, strong counter pressure resistance and other performances of the internal flow.

The invention discloses a design method of a variable cross-section three-dimensional internal contraction air inlet channel matched with a curved cone projectile body, which comprises the curved coneprojectile body and the variable cross-section three-dimensional internal contraction air inlet channel and comprises the following steps: 1) designing the inlet shape of the variable cross-section three-dimensional internal contraction air inlet channel and the shoulder profile shape of the air inlet channel according to the geometric shape of the curved cone projectile body and the combustion chamber inlet shape requirement; 2) dispersing the inlet molded line of the air inlet channel and the shoulder molded line of the air inlet channel; 3) solving the axisymmetric basic flow field, and performing streamline tracking in the basic flow field according to the shape of the variable cross-section three-dimensional internal contraction air inlet to obtain a corresponding streamline; 4) cutting off the streamline according to the relative position of the inlet and outlet shapes of the variable cross-section three-dimensional internal contraction air inlet channel, and performing three-dimensional arrangement on the obtained streamline to obtain a variable cross-section three-dimensional internal contraction air inlet channel compression molded surface; and 5) on the basis of the variable-cross-section three-dimensional internal contraction air inlet channel compression molded surface, carrying out geometric construction on the variable-cross-section three-dimensional internal contraction air inlet channel matched with the curved cone projectile body.

The disclosure provides compositions and methods useful for treating glaucoma. In particular, the invention provides an adeno-associated viral (AAV)-mediated gene therapy for glaucoma in which transduced cells of the eye secrete a therapeutic protein (for example, a matrix metalloproteinase) resulting in remodeling of the extracellular matrix of the trabecular meshwork of said eye.

A full-three-dimensional inward turning air inlet channel reverse design method based on the curved shock wave theory comprises the following steps of: 1) specifying full-three-dimensional incident shock waves in a full-three-dimensional reference flow field according to design requirements; 2) dispersing the full-three-dimensional incident shock waves into a series of reference planes, and solving a corresponding full-three-dimensional internal contraction basic flow field by utilizing a curved shock wave theory according to a full-three-dimensional incident shock wave angle, a shock wave curvature and a wave back parameter; 3) designing a full-three-dimensional inward turning air inlet channel outlet section, and performing streamline tracking in the full-three-dimensional internal contraction basic flow field in the step 2) to obtain a hypersonic speed full-three-dimensional inward turning air inlet channel compression profile, wherein the cross section is elliptical or quasi-rectangular; and 4) geometrically constructing a hypersonic speed full-three-dimensional inward turning air inlet channel on the basis of the full-three-dimensional inward turning air inlet channel compression profile in the step 3): according to the outlet area requirement, equally straightening or expanding and stretching a shoulder molded line to obtain a full-three-dimensional inward turning air inlet channel isolation section, and obtaining the full-three-dimensional inward turning air inlet channel based on the curved shock wave theory in the designed flight state.

The invention discloses a hypersonic aerocraft and air inlet internal and external waverider integrated design method, and relates to a near space aerocraft. An aerodynamics characteristic is firstly appointed, and then a design scheme meeting the characteristic is inferred backwards; a three-dimensional shock wave curved surface in a complex shape is appointed, the change rule of the transverse curvature center is obtained, and a series of basic flow fields meeting the needs of the waverider design are inferred backwards according to the change rule; flow lines of different curvature centers and different radial positions are traced in every basic flow field in the circumferential direction; a waverider device capable of producing the appointed complex three-dimensional shock wave curved surface is obtained finally, namely the integrated design scheme is obtained. The advantages of a waveriders and an internal waverider air inlet are kept, the integrated design of the two high-performance devices is achieved, the waverider model with high lift-drag ratio and the scheme of the air inlet with full-flow capture can be obtained at the same time, and accordingly the overall performance of the aerocraft is improved.

A short circuit prevention porous efficient liquid flushing electrode for arc discharge machining is characterized in that the electrode is cylindrical; the central area of the bottom of the electrodeis provided with a blind hole along the electrode axis; a plurality of inner liquid flushing through holes are distributed in one periphery of the outer side area of the bottom of the electrode in the axial direction; the side face of the electrode is provided with a plurality of liquid flushing chip discharge grooves, so that the side face of the electrode forms a discontinuous surface; each liquid flushing chip discharge groove is open in the bottom face of the electrode; and the openings of the liquid flushing chip discharge grooves and the inner liquid flushing through holes are formed ina staggered mode. According to the electrode, the decompression effect on work liquid from a non-discharge machining area can be reduced effectively, strong inner liquid flushing of the discharge machining area is maintained, a short circuit phenomenon is prevented, the quality of the machined surface is promoted, the machining rejection rate is lowered, and uniformity of electrode loss and the precision of the machining size are improved.

The invention discloses an internal waverider-derived high supersonic inlet duct, the shapes of the inlet and outlet of which can be customized, and a design method thereof. The structure of the internal waverider-derived high supersonic inlet duct comprises an inlet duct contraction section and an isolated section, wherein the shape of the inlet duct contraction section is in three dimensional inward contraction. The design method is that a non-axisymmetric internal contraction basic flow field is taken as the base, the non-axisymmetric internal contraction basic flow field comprises an axisymmetric internal contraction rotary wall surface and a non-axisymmetric variable radius central body, wherein the axisymmetric internal contraction rotary wall surface keeps no changing, and the radius of the central body is adjustable. The invention has the advantages that the internal waverider-derived high supersonic inlet duct can capture the inflow by full flow and has low Mach number automatic overflow; the shapes of the inlet and the outlet can be customized according to the layout requirement, and the parallel module installation or the integrated design with various aircrafts can be easily realized.

A liquid ejecting apparatus includes a liquid chamber in communication with a nozzle, a volume changing unit configured to change a volume of the liquid chamber, an inflow passage through which the liquid flows into the liquid chamber, an outflow passage through which the liquid flows out of the liquid chamber, a passage resistance changing unit configured to change a passage resistance of the outflow passage, and a controller configured to control the volume changing unit to reduce the volume of the liquid chamber so as to cause the liquid to be ejected through the nozzle. In filling the liquid chamber with the liquid for ejection of the liquid through the nozzle, the controller controls the passage resistance changing unit to change the passage resistance of the outflow passage to an increased passage resistance and controls the volume changing unit to increase the volume of the liquid chamber.

The invention discloses a wide-speed-range air inlet channel design method based on double-incidence bending shock waves. The method comprises the following steps of designing a double-incidence bending shock wave reference flow field based on the bending shock wave theory; designing an air inlet channel initial throat section molded line, and performing reverse flow streamline tracking in the reference flow field to obtain an initial air inlet channel compression molded surface; designing an air inlet channel isolation section outlet section, expanding an air inlet channel initial throat section in a double-S-bend form, and stretching in an equal-straight manner to obtain a three-dimensional inward-turning wide-speed-range air inlet channel isolation section; carrying out wall surface fairing and viscosity correction; taking the tail end of a first-stage compression molded surface of an air inlet channel as the rotating shaft position of a first-stage splitter plate, and taking the length of a second-stage compression molded surface as the length of the first-stage splitter plate; taking the position where the second derivative of an upper wall curve of the air inlet isolation section is zero, taking the position as the position of a second-stage splitter plate rotating shaft, and taking the length from the second-stage splitter plate rotating shaft to the air inlet channel initial throat section as the length of the second-stage splitter plate; and designing a discharge port area under the Mach number and a throat area under the Mach number. Expansion waves at the position of the rotating shaft can be eliminated; and performance requirements are met.

A method is provided for increasing the aqueous outflow of fluid through a trabecular meshwork and into a Schlemm's canal of an eye. A liquid hydrogel precursor solution is introduced into the Schlemm's canal, during a medical procedure. The liquid hydrogel precursor solution is crosslinked to form a water-permeable flexible semi-solid hydrogel in the Schlemm's canal, during the medical procedure. The hydrogel is left in the Schlemm's canal upon conclusion of the medical procedure. Other embodiments are also described.

A ballpoint pen tip in which ink grooves are formed around an ink guide hole at equally distributed places, the ink guide hole connecting a ball house and a back hole of a holder for holding the writing ball, and the ink grooves radially penetrate through from the ball house side to the front end portion of the back hole. Inward protrusions are formed at positions which are respectively in contact with the rear ends of the ink grooves. If the inner diameter of the ink guide hole is A, the inner diameter of the front end portion of the back hole is B, the diameter of the circle circumscribing the ink grooves is C, and the diameter of the circle inscribing the inward protrusions is D, their relationships are A<B<C, and D<B.

The invention relates to a biconical refiner with an internal diversion channel. The biconical refiner comprises an engine base, a grinding chamber base, a main shaft, a biconical rotor and a biconical stator; the interior of a left conical rotor body and the interior of a right conical rotor body are each provided with a rotor diversion cavity, the rotor diversion cavities are communicated with a grinding chamber cover and a grinding chamber feeding cavity, and the external conical surface of the left conical rotor body and the external conical surface of the right conical rotor body are each provided with a rotor diversion hole perpendicular to the direction of the grinding surface; the interior of a left conical stator body and the interior of a right conical stator body are each provided with a stator diversion cavity, the stator diversion cavities are communicated with a grinding chamber cover discharge cavity, the external conical surface of the left conical stator body and the external conical surface of the right conical stator body are each provided with a stator diversion hole perpendicular to the direction of the refining surface, the rotor diversion cavities, the rotor diversion holes, the stator diversion holes and the stator diversion cavities from the internal diversion channel. According to the biconical refiner with the internal diversion channel, channel design is scientific and reasonable, throughput of the biconical refiner in unit time is increased, the refining efficiency of the middle and the big end of the conical rotor is exerted, and refining power consumption is further reduced.

The invention provides a transverse pressure gradient controlled ride wave forebody and air inlet channel integrated designing method and relates to a near space hypersonic flight vehicle. The method comprises the steps of designing a basic flow field required by a two-dimensional air inlet channel; confirming the position where a designed cross section is located; designing projection of front edge capture molded lines in the designed cross section according the working condition requirements and calculating projection distances from front edge points in wedge tangent planes to shock wave points in z-direction; obtaining pressure distribution of compression molded lines at the positions of the wedge tangent planes corresponding to disperse shock wave points; obtaining newly-generated two-dimensional air inlet channel compression molded lines by applying two-dimensional characteristic line method according to calculated pressure distribution; arranging the two-dimensional air inlet channel compression molded lines at the positions of the corresponding front edge capture molded lines to form a complete air inlet channel compression profile, obtaining a ride wave forebody and air inlet channel integrated device after three-dimensional modeling and finishing the transverse pressure gradient controlled ride wave forebody and air inlet channel integrated design. By adopting the method, the device can have high lifting drag characteristic, external flow resistance is reduced while engine thrust is increased.

The full three-dimensional waverider inverse design method based on the bending shock wave theory, 1) specify the three-dimensional external flow shock wave in the full three-dimensional reference flow field according to the design requirements, and the full three-dimensional external flow shock wave adopts an elliptical or non-axisymmetric shape design; The three-dimensional outflow shock wave is discretized into a series of reference planes, and according to the full three-dimensional outflow shock angle, shock curvature and wave parameters, the corresponding full three-dimensional external compression basic flow field is solved by using the bending shock theory; 3) the full three-dimensional waverider is designed The body captures the profile and performs streamline tracking in the full three-dimensional external compression basic flow field in step 2) to obtain the compression profile of the lower surface of the hypersonic full three-dimensional waverider, and the profile adopts an elliptic curve or a non-axisymmetric shape; 4 ) geometrically construct the hypersonic full three-dimensional waverider based on the following surface compression profile: according to the volume ratio requirements, the upper surface of the waverider is constructed as a plane or a convex surface, and the full Three-dimensional waverider.