50results about How to "Shorten the distribution path" patented technology

A loudspeaker includes a frame connected to a magnetic circuit having a magnetic gap and a diaphragm having an outer circumference connected to the frame and connected around a voice coil embedded into the magnetic gap. A communication groove is provided for communicating a void portion formed between the rear surface of the diaphragm and the inner part of the voice coil, with outside. Thus, it is possible to shorten the air flow route on the diaphragm rear surface so as to reduce the air flow resistance and accordingly, to increase the reproduction sound pressure of the low range.

The invention provides a coupling jacket type fractal branching structure heat exchanger. The coupling jacket type fractal branching structure heat exchanger at least comprises an outer shell, an inner shell, a jacket layer, a first pipe plate, a first end socket, a second pipe plate, a second end socket, a main pipeline and fractal branching structure heat exchange pipe bundles, wherein the inner shell is arranged in the outer shell; the jacket layer is formed between the inner shell and the outer shell; the pipe plates and the end sockets are arranged at two ends of the outer shell; through holes which correspond to the position of the jacket layer are formed in the second pipe plate; one end of the main pipeline penetrates through and is fixed to the first end socket and the first pipe plate; the fractal branching structure heat exchange pipe bundles are arranged in the inner shell, the center parts are communicated with the main pipeline, and the tail ends are communicated with the jacket layer through a hole body in the inner shell. The coupling jacket type fractal branching structure heat exchanger provided by the invention has the advantages that a material collection problem in the prior art is solved, the heat transfer ability is substantially increased, the pressure drop of a system is reduced, and the technical purposes of high heat transfer ability and energy conservation are reached.

The invention discloses an implementation method of automatic resonance type electric power filtering and continuous reactive power compensation. When a resistant of an automatic resonance type electric power filtering and continuous reactive power compensation mixing system is designed, a medium voltage side winding equivalent impedance of a rectification transformer is equal to or approximately equal to 0, meanwhile the equivalent impedance under h harmonic frequency is equal to or approximately equal to 0 under the control of a multiple target mixture controller. By using the method, the restriction to an electric power filtering function by system impedance is eliminated, the influence caused by frequency fluctuations at an electric network side and a nonlinear load side to the electric power filtering performance can be avoided, and the high-efficiency operation of a power supply system is realized.

The invention discloses a battery pack box body and belongs to the technical field of new energy automobiles. The battery pack box body comprises a sealed box body, wherein the box body is separated into a heat exchange bin and a battery bunching bin which are communicated by a horizontal baffle; the heat exchange bin is internally provided with a refrigerating unit and a heating unit; a plurality of batteries are ranked in the battery bunching bin dispersively. The battery pack box body can ensure uniform internal temperature distribution of the box body, thereby effectively improving the energy source utilization ratio, reducing the noise transmitted outside, improving the waterproof performance, and further guaranteeing the safety of the battery pack.

The invention relates to a duplex coil large-drift-diameter plate type antiskid exhaust valve for installing a railway vehicle. The exhaust valve comprises a middle valve body, an air inlet side plate and an exhaust side plate. An air inlet diaphragm is installed between the middle valve body and the air inlet side plate, and an exhaust diaphragm is installed between the middle valve body and the exhaust side plate. A pre-control pressure inlet P, an air inlet D, an air outlet C and an atmosphere exhaust port O passage structure are sequentially arranged at the bottom of the middle valve body. An exhaust port T is formed in the exhaust side plate. A duplex coil redundant structure is installed between the air inlet side plate and the exhaust side plate and is composed of four coils, the four coils are divided into two sets to control whether corresponding movable iron cores are excited or not, the two sets of coils are in redundant backup and can both control the antiskid exhaust valve to work, and system reliability is improved. Large-caliber ports are adopted for the atmosphere exhaust port O, the air inlet D and the air outlet C, the atmosphere exhaust port O, the air inlet D and the air outlet C are horizontally arranged at the bottom of the middle valve body, air charging and exhausting operation can be fast performed on a brake cylinder, meanwhile, a slab structure is adopted, detachment and replacement are facilitated, and maintenance is facilitated.

The invention provides a distributed power grid system, comprising a first-grade node, a second-grade power network, a first secondary-grade node, a first user, a second secondary-grade node, a second user, a third secondary-grade node and a third user, wherein a power device of the user performs the power energy exchange through the respective second-grade node and the second-grade power network; the first-grade node can coordinate power energy exchange between the different second-grade nodes through the secondary-grade power network.

The invention relates to a wall-mounted air conditioner which comprises an angular housing, a heat exchanger, a main fan, a framework and a water pan assembly, wherein the angular housing comprises an upper panel, a lower panel and two side panels which are integrated, the upper panel and the lower panel are connected, the included angle between the upper panel and the lower panel is between 50 DEG and 90 DEG, an air inlet hole is disposed in the upper panel, an air outlet hole is disposed in the lower panel, an air chamber is formed by the framework and the water pan, the main fan is located inside the air chamber, the heat exchanger is located between the water pan and the framework, the water inlet hole is communicated with the air chamber by the heat exchanger, the air chamber is communicated with the air outlet hole, a flow guide air duct is disposed between the air inlet hole and the air outlet hole, and a flow guide fan is disposed in the flow guide air duct. By the wall-mounted air conditioner provided by the invention, a circulation route of air flow from the air inlet hole to the air outlet hole is greatly reduced, acting time of the air flow at components of the air conditioner inside the housing body is reduced, noise is reduced, non-heat exchange air is introduced by the flow guide air duct to the air outlet hole to be mixed with heat exchange air in order to form mixed air, air outflow becomes more soft, and comfort is greatly enhanced.

The invention discloses an atmospheric particulate measuring device and method based on surface acoustic wave technology. The measuring device comprises an impact type stage sampling unit, a surface acoustic wave sensor, a flow control unit and a control and arithmetic unit, wherein atmospheric particulates of different sizes are separated by the impact type stage sampling unit; the surface acoustic wave sensor is used for collecting the separated particulates of different sizes; the flow control unit is used for obtaining the volume of passing gas; the flow control unit is connected with thatcontrol and arithmetic unit, the control and arithmetic unit controls flow of wind speed according to calculation parameters of the flow control unit, simultaneously collects signals of the surface acoustic wave sensor, calculates mass of the particulates of different sizes, and calculates volume concentration or mass concentration of the atmospheric particulates of different sizes according to mass of the particulates of the size. Integration of particle size cutting and collection of the atmospheric particulates is achieved, mass of the particulates is directly measured by the surface acoustic wave sensor, and detection precision of the mass of the particulates is improved.