38results about How to "Improve flow resistance" patented technology

A MEMS flow sensor is provided having a micro flow channel etched in a silicon structure composed of two silicon substrates bonded or fused together. A heater and one or more temperature sensors are, in one embodiment, disposed around the perimeter of the flow channel and outside of the channel. In another embodiment, a heater and one or more temperature sensors are respectively disposed outside the flow channel at the top and bottom of the channel. In further embodiments, a heater and one or more temperature sensors are located inside the flow channel on one or more surfaces thereof or around the inside perimeter of the channel. The flow sensors in accordance with the invention are preferably fabricated using wafer scale fabrication techniques.

The invention provides a pavement patching material. The patching material comprises the following components in parts by weight: 70-90 parts of asphalt, 10-30 parts of extract oil, 15-30 parts of waste rubber powder, 2-8 parts of high polymer and 0.05-4 parts of crosslinking aid. The preparation method comprises the following steps of: heating the asphalt to 100-180 DEG C, adding the high polymer and uniformly stirring; heating the extract oil to 100-160 DEG C, adding the waste rubber powder and beginning to stir uniformly; blending the two stirred mixtures and uniformly stirring; and addingthe crosslinking aid and uniformly stirring. The patching material has the characteristics of simple process and higher high and low temperature resistance and can be applied to the patching of cracks of pavements or bridge floors.

The invention discloses chemically-modified hard asphalt and a preparation method thereof. The chemically-modified hard asphalt comprises the following components in parts by weight: 100 parts of basic asphalt, 0.5-3.0 parts of polyphosphoric acid, 2-12 parts of ductility increasing agent mother liquor and 0.2-0.4 part of a surfactant. The preparation method comprises the following steps: adding polyphosphoric acid into the melted basic asphalt for chemically-modified reaction, then adding the ductility increasing agent mother liquor for further reaction, and finally adding the surfactant for further reaction for a period of time to prepare the chemically-modified hard asphalt. The whole process is implemented under a high-speed stirring condition. The chemically-modified hard asphalt prepared by the preparation method disclosed by the invention is high in flow resistance, high in softening point, high in low-temperature ductility, high in bonding property with aggregate, and excellent in high temperature stability, low temperature cracking resistance, fatigue resistance and water invasion resistance; the chemically-modified hard asphalt is particularly suitable for areas with high temperature, wet areas and areas with large diurnal temperature difference and can be used for paving a pavement of a traffic road, so that common pavement damage phenomena such pavement rutting, upheaval, fatigue cracking, low-temperature cracking and water invasion of the pavement are effectively prevented, and the service life of the pavement is prolonged.

The invention discloses a preparation method of modified asphalt. The modified asphalt is produced by asphalt and an undersaturation double bond compound which are reacted under the action of an evocating agent; the method comprises the following steps: firstly, the asphalt is put into a reaction kettle; the evocating agent is added into the reaction kettle; the weight of the evocating agent is 0.05-1 percent of the weight of the asphalt; the undersaturation double bond compound with the weight of 1-10 percent of that of the asphalt and 0.1-1 percent of N-phenyl maleimide are added into the reaction kettle at the temperature of 80-160 DEG C; and the pressure remains 0.1-0.4 MPa. The reaction is carried out for 3-6 hours; the reaction product is deaerated and filtered, and then the modified asphalt is obtained. The chemically modified asphalt provided by the method has good performance, which greatly improves the shortcomings that the common asphalt has strong temperature sensibility, low viscosity, poor flexility and the like. The modified asphalt can meet the use performance of roads and prolong the service life of roads; when the modified asphalt is used in road maintaining, maintenance, the time of traffic closing is shortened, the construction condition is improved and the construction efficiency is increased.

The invention discloses a down-flow type anti-flow net cage, including a rectangular floating pipe positioned at the top of the net cage, wherein a cylindrical net cage with a horizontal axis is connected to the lower end of the floating pipe; an annular strengthening truss is arranged at one end of the cylindrical net cage, while a flow divider with a conical steel pipe truss structure is connected to the other end of the strengthening truss; a HDPE immersed pipe is arranged at the bottom of the cylindrical net cage along the direction parallel to the axis; the HDPE immersed pipe is filled with iron sand. Compared with the prior art, better stability is provided for water fluctuation due to the application of the conical flow divider, so that the instant pulling force extreme value of an anchor line system can become effective, the risk of dragging can be effectively reduced, and thereby the construction requirement of an anchoring device can be reduced. Compared with the prior art, the HDPE immersed pipe filled with the iron sand has the advantages of balanced traction force and good stability. And therefore, the down-flow type anti-flow net cage has the advantages of stable structure, outstanding anti-flow performance, good stability, low cost and low construction technical requirements.

The invention discloses a self-powered submersible net cage which comprises a submersible net cage body with a rigid main frame. A floating frame in the shape of a prismatic table is connected at the upper portion of the main frame. A sealed mesh is connected onto the inner side of the submersible net cage body. A traction cable is connected onto the lower side of the rigid frame and a self-submersion base, and the self-submersion base is provided with a winding-unwinding control assembly. The winding-unwinding control assembly can wind and unwind the traction cable as required so as to control the distance between the self-submersion base and the rigid main frame. The submersible net cage body is connected with a transducer which can convert wave energy to electricity, supply electricity to the winding-unwinding control assembly and store electricity. The winding-unwinding control assembly controls the distance between the self-submersion base and the rigid main frame by winding and unwinding the traction rope, and therefore harvesting and stocking of marketable fishes according to demands are achieved. The transducer generates electricity and store the electricity in the winding-unwinding control assembly. Therefore, the self-powered submersible net cage has the advantages of needing no counterweight system, being convenient to manage, small in energy consumption, good in storm resistance, constant in aquatic water capacity and applicable to middle and lower layer fish breeding.

The invention discloses a submergence lifting net cage comprising a submergence net cage body provided with a rigid main frame, wherein a prismatic floating frame is connected to the upper part of the main frame; a closed mesh is connected to the inner side of the submergence net cage body; a traction cable is connected to the lower side of the rigid main frame; the traction cable is further connected with a self-submergence base provided with a coiling and uncoiling control component; the coiling and uncoiling control component can be used for controlling the distance between the self-submergence base and the rigid main frame by coiling and uncoiling the traction cable according to needs. The coiling and uncoiling control component is used for coiling and uncoiling the traction cable to control the distance between the self-submergence base and the rigid main frame in order to harvest and breed commercial fish according to demand. The outer side of the rigid main frame is connected with an anchor rope through the traction cable to form an array system for facilitating management. The invention has the advantages of needing no counterweight system, and being convenient to manage, good in wave and current resistance, constant in aquatic water volume and suitable for breeding middle and lower fishes.