32results about How to "Large cavity volume" patented technology

The invention provides a heater multi-pipe heat conducting type shell-tube water storage bearing heat interchanger and a manufacturing technology thereof. The heat interchanger comprises multiple round cold water pipes; head external blocking plates are welded at two ends of the round cold water pipes; heater pipe connecting blocking plates are welded in pipe openings at two ends of the round cold water pipes; round heater pipe connecting openings are formed on the heating pipe connecting blocking plates; pipe cavities are directly welded and communicated by the adjacent round cold water pipes through straight round cold water communicating pipes or butt-welded wall pulling pipes; at least one round heater pipe is penetrated into the cavity of each round cold water pipe; pipe openings of two ends of each round heater pipe are in welded connection with connecting openings of the round heater pipe on the heater pipe connecting blocking plates; round heater communicating pipes are in welded communication with the heater pipe connecting blocking plates or the round heater communicating pipes are sequentially welded and communicated with the head external blocking plates and are communicated with a thermal fluid shunting cavity to form a thermal fluid circulated heat transmission passage. The heat interchanging structure is more scientific and reasonable; the heat transmission area is improved by 55%-100%; the heat conduction rate is accelerated; the heat exchanging effect is excellent. The welding joints of the communicating pipes among the cavities are difficultly subjected to water leakage.

The invention discloses a method for preparing a carbon nano hollow polyhedron by using a hydrothermal method and belongs to the field of nano graphite preparation. According to the method, a chemicalsynthesis method is utilized, pyrene with a benzene ring structure is taken as a raw material, a reaction is carried out under an alkaline condition and at a relatively low temperature, and a prepared reaction product is high in graphitization degree, the cavity volume is large, and the reaction product has potential characteristics of light weight and high strength. The method is low in energy consumption, short in consumed time and high in product quality, the adopted chemical synthesis method is completely different from the prior art, and innovation and novelty are achieved.

The invention discloses a round header shell and tube water storage heater multi-tube heat conducting heat exchanger and a manufacturing process thereof. Two ends of a cold water round tube are communicated with a header body, the header body comprises a header inside semicircular orifice plate, a header outside semicircular plate and a header end cover plate, heater round tubes or combined heater round tubes are arranged in a cold water round tube cavity, the combined heater round tubes and / or the heater round tubes are communicated, a heater inlet joint and a heater outlet joint are communicated with inlet ends and outlet ends of the combined heater round tubes and / or the heater round tubes in a welded manner and then fixedly connected with the header outside semicircular plate, and a cold water inlet joint and a cold water outlet joint are welded on the header outside semicircular plate and communicated with an inner cavity of a header to realize circulation. The thin combined heater round tubes with manifolds for conducting heat, branching flow and converging ends are arranged in the cut-off middle of a heater tube, heat of a hot fluid center of the heater tube is promoted to be rapidly released from multi-tube dividing walls, and heat transfer area in the cold water tube cavity is increased by 45%-100%. By the aid of the reducing round tubes in communication, pressure resistance is high, and water does not easily leak.

The invention discloses a dynamic control mechanism of a hinge-free aircraft. A jet mechanism is positioned in a closed jet cabin in an aerofoil. A transmission mechanism and a motor are positioned in the aerofoil and out of the jet cabin; and the motor drives a rotating plate of a jet mechanism to move up and down through the transmission mechanism. An upper skin and a lower skin of the aerofoil are provided with a jet seam and an air suction seam. The jet cabin consists of an upper compartment and a lower compartment which are partitioned. The motion of the rotating plate enables the compartments to form two strokes of 'air suction' and 'air exhaust', and low-frequency high-speed airflow is generated through the air suction seam and the jet seam, so that pneumatic load distribution on the aerofoil is changed, and a pneumatic force required by dynamic control of the aircraft is generated. The dynamic control mechanism has large cavity volume and high air compression amount; high synthetic jet velocity can be generated under low driving frequency, good effect is achieved at a small angle of incidence, and flying weight and fuel oil consumption are reduced; and the dynamic control mechanism has the characteristics of simple structure and reliable start and operation, and can meet the requirement of dynamic control of the aircraft under different flying conditions.

The invention discloses a columnar hydraulic tappet, which has a shell, and a plunger which moves axially relative to the shell is correspondingly installed in the inner cavity of the shell, and a first annular groove is arranged under the head of the plunger. There is a second ring groove in the middle of the plunger, the middle wall of the plunger is between the first ring groove and the second ring groove, and the second ring groove is a concave wide ring groove, which is characterized in that the middle wall of the plunger At least one oil inlet hole communicating with the second annular groove is opened on the upper part, and a sealing band is left on the upper part of the middle wall of the plunger for cooperating with the inner cavity of the housing to block the circulation of the hydraulic medium. The position of the plunger oil inlet hole relative to the one-way valve is raised to increase the oil storage capacity of the plunger oil storage chamber. When the engine is cold started, the abundant hydraulic medium can quickly replenish the high-pressure chamber in the one-way valve, shortening the hydraulic pressure. The time it takes for the column to recover from the compressed height to the normal working height, quickly eliminate the valve clearance, reduce the time for the cold start of the valve train to eliminate the noise and the wear of the corresponding parts.

The invention discloses a vehicle protection device convenient to maintain. The vehicle protection device convenient to maintain is characterized by comprising an anti-collision housing and a buffering structure, wherein the anti-collision housing is arranged in front of a front end shell of a vehicle and the buffering structure is arranged between the anti-collision housing and the front end shell. The buffering structure comprises a plurality of buffering units, which are respectively arranged in at least two lines in the transverse direction; arc end surfaces are arranged at one ends, facing the anti-collision housing, of the buffering units; and the two adjacent buffering units are connected with each other in a clamped manner. According to the vehicle protection device convenient to maintain, the buffering structure is arranged between the anti-collision housing and the front end shell; on the one hand, the arc end surfaces are arranged at one ends, facing the anti-collision housing, of the buffering units so that the buffering units can preferably bear forces; especially, the plurality of lines of the arc force bearing structures match each other so that the acting effect isbetter; on the other hand, the longitudinal buffering units in each line are connected with each other in a clamped manner so that the buffering units are convenient to detach and can be updated in time if being partially damaged to avoid integral changing and reduce cost. On the whole, the good state is conveniently kept at any time to protect the vehicle body and a protection effect in collisionis more optimal.

The present invention relates to the technical field of hollow sphere preparation, particularly to a method for preparing hollow spheres through a microwave-assisted aerosol. The method comprises: A, dispersing a hollow sphere shell precursor in a polar solvent, adding an ammonium salt to form a colloidal solution or true solution, ie., a precursor solution; B, carrying out atomization on the precursor solution prepared in the step A to form aerosol liquid droplets; and C, introducing the aerosol liquid droplets prepared in the step B into a microwave generator to carry out microwave irradiation to obtain the hollow sphere powder particles. According to the present invention, the hollow sphere powder preparation method has characteristics of short production period, simple operation, no pollution, easy scale-up and easy promotion application, wherein the microstructure of the prepared hollow sphere powder is not easily damaged.

The invention relates to a preparation method of biodegradable polymer microcapsules. The method mainly comprises the following steps: preparing microspheres with openings, filling a capsule core material and sealing the openings of the microspheres. The biodegradable material microcapsules can be used to encapsulate micromolecular and bio-macromolecular substances and can also be used to load nanoscale and microscale particles. Compared with the traditional multiple emulsion embedding method, the method is milder so that bioactive substances are prevented from damaging; the residual capsule core material in the solution after embedding can be recycled; the method is more environmentally-friendly, the originally reported particle size and pore diameter can be realized, the volume of the inner cavity is larger so as to facilitate the loading of the capsule core material; and the method is suitable for mass production.

The invention relates to a white LED (Light-Emitting Diode) light source of a transparent ceramic fluorescent tube packaged with blue chips on an inner wall thereof. The white LED light source is composed of the transparent ceramic fluorescent tube (1), a high transmittance packaging shell (2), an electrode (3), a cooling fin (4) and blue light-emitting bars (5), wherein the blue light-emitting bars (5) are adhered to the inner wall of the transparent ceramic fluorescent tube (1); the transparent ceramic fluorescent tube (1) is located right on the cooling fin (4) and placed in the high transmittance packaging shell (2); the high transmittance packaging shell (2) is inverselybuckled on the upper end face of the cooling fin (4); the electrode (3) is located under the cooling fin (4); one end of the electrode (3) is connected with the cooling fin (4) via a connection line and the other end of the electrode (3) is connection with an external power source. As the inner wall adhesion technology is adopted, the white LED light source is efficient and concise, the light emission is uniform; as the transparent ceramic fluorescent tube per se has excellent heat-conducting property and a big cavity volume is reserved between the transparent ceramic fluorescent tube and the high transmittance packaging shell, the heat dissipation effect is greatly improved. Since the remote excitation technology is adopted, the light emission is more uniform, the light diffusion loss is reduced and the light-emitting efficiency is improved.

The invention relates to a rotary piston pump having: a) a housing (10) with an inlet (11) and an outlet (12) for the medium to be pumped; b) at least one rotary piston (20), It is mounted drivably and rotatably in a housing (10) and has at least two contoured transport wings (22) which transport the medium to be transported from the inlet (11) to the outlet (12); c) and the sealing element (30) of each rotary piston (20), which bears on the sealing body (42) and runs on the contour of the rotary piston (20) during the rotation of the rotary piston (20) And carry out on the different side of transport wing (22) carry out moving from the smallest diameter of rotary piston (20) to the maximum diameter of rotary piston (20) and from the maximum diameter of rotary piston (20) to rotary piston (20) The smallest diameter movement in, wherein, d) the path that the sealing element (30) carries out on the movement side (221) of the transport wing (22) during the movement in is smaller than the path carried out on the side (222) during the movement out .

The invention discloses an anti-collision structure for an automobile. The anti-collision structure for the automobile comprises an anti-collision housing and a buffering structure, wherein the anti-collision housing is arranged in front of a front end shell of the automobile, and the buffering structure is arranged between the anti-collision housing and the front end shell; the buffering structure comprises two or more transversely arranged buffering units; arc end surfaces are arranged at one ends, facing the anti-collision housing, of the buffering units in the longitudinal direction; and the two adjacent buffering units are connected with each other in a clamped manner. According to the anti-collision structure for the automobile, the buffering structure is arranged between the anti-collision housing and the front end shell; on the one hand, the arc end surfaces are arranged at one ends, facing the anti-collision housing, of the buffering units in the longitudinal direction so thatthe buffering units can preferably bear forces; and on the other hand, the two adjacent transversely arranged buffering units are connected with each other in a clamped manner so that the buffering units are convenient to detach and can be updated in time if being partially damaged to avoid integral changing and reduce cost. On the whole, the good state is conveniently kept at any time to protectthe automobile body and a protection effect in collision is more optimal.

The invention discloses a surface energy-driven self-assembly method for preparing multi-cavity carbon spheres and application thereof. The keys of synthesis are as follows: firstly, a nano emulsion droplet is prepared, or a Ludox is selected as a base unit; then, a polymer is pre-polymerized on the surface of the nano emulsion droplet or Ludox so as to obtain a small-size secondary structure unit with high surface energy; along with the proceeding of hydrothermal reaction, the free energy of the system is reduced to cause self-aggregation and assembly of secondary units to form an aggregate with a multi-cavity structure, and the size of each cavity and the number of cavities can be adjusted by virtue of the size of the nano emulsion droplet and the concentration of the polymer; and the multi-cavity polymer can be pyrolyzed in the space of an inert silica limited range to obtain multi-cavity carbon spheres with expanded cavity sizes. When the prepared multi-cavity carbon spheres are used as carriers, because of strong adsorption potential in the cavities, the internal cavity volume can be fully occupied and utilized by object species.