What is a power amplifier?
26 Jul 2021

What is a power amplifier? Power amplifier referred to as power amplifier Car power amplifier-is the audio power amplifier in the car audio-visual system. Its function is to select and process the audio input signal, and amplify the power so that the electrical signal has the ability to push the speaker. Car power amplifiers are slightly different from those in ordinary home theaters. Because many car hosts integrate power amplification functions to play a pre-amplification function, car power amplifiers are sometimes referred to as post-amplification, which means that they can be connected and amplified. High level input over. Amplifier is an indispensable component of a good sound system. The power amplifier on the host often cannot really amplify the sound current, so if you want to have a good music experience, you must install a power amplifier. Generally speaking, the power of the power amplifier is greater than the power of the speaker. Many car owners think that installing a bass amplifier is just for shocking effects. In fact, this is ignoring the characteristics of the car. No matter how high-end cars are, there will be noise. The bass part of the music released during driving will be different Attenuation, and the addition of a bass power amplifier can increase the reserve power, supplement the loss of bass and reduce distortion. Because the car amplifier is connected to the host and the speaker, the coordination between the host and the speaker must be considered when purchasing the amplifier. It is directly related to the effect of music playback and the life of the equipment. The matching of car power amplifier mainly includes impedance matching and power matching. The power amplifier has a great influence on the sound quality. Generally speaking, the power amplifier and speakers of the same brand are better matched, which should be considered first; if you choose brand-name car speakers and power amplifiers, you can generally match them according to their technical parameters; for unknown brands It's best to actually pair with the audition.  

What is an aluminum extrusion die | aluminum extrusion factory
12 Aug 2021

We Provide aluminum extrusion,Aluminum extrusion factory.If you are interested in aluminum extrusion,You can browse related products and initiate consultations on our website. For product structure design engineers, although we don’t design aluminum extrusion dies, understanding the most basic extrusion die structure and the mechanism of how to shape different extrusions can help in extrusion When designing press parts, optimize the design to reduce mold cost and improve the production efficiency of extruded parts. 1 What is an extrusion die? The extrusion die is basically a thick circular steel plate containing one or more openings to form the desired profile. They are usually made of H-13 die steel and have been heat treated to withstand the pressure and heat of the hot aluminum as it passes through the die. 1 Classification of extrusion dies According to the cross-sectional shape of aluminum extrusions, the corresponding molds are divided into three categories: solid molds, semi-hollow molds and hollow molds. Among them, the hollow mold has the most complicated structure, is easy to wear and break, and has the highest cost. 3 The life of the extrusion die The heat accumulation and uneven pressure caused by the design of aluminum extrusion parts (such as thin walls, uneven wall thickness and prominent features) are the biggest killers of extrusion die life. Experienced extrusion mold engineers can design molds to control heat and uneven pressure, and reduce the extrusion speed to extend the life of the mold, but eventually the mold must be replaced. Before designing aluminum extrusion parts, product structure design engineers should understand which design features will most significantly affect mold processing costs. When possible, changing the design of the aluminum extrusion section, setting appropriate tolerances, and selecting appropriate aluminum alloy materials can save the processing cost of aluminum extrusion molds.

Why can't the heat medium of aluminum radiators use steam | aluminum heatsink
26 Oct 2021

The role of steam has been paid attention to since the beginning of the industrial revolution. In the process of modern heating and heating, there are also many application examples that use steam as the heat medium. The following Refrigeration Express will analyze the characteristics of steam as the heat medium of the heating system. Compared with hot water as the heating system, steam has the characteristics.    1. In the heat dissipation equipment of the system such as radiator, steam condenses into water to release heat. When steam and condensed water flow in the system pipelines, their state parameters change greatly, and they will also be accompanied by phase changes. The steam condenses and releases heat at a constant pressure in the heat dissipation equipment, and the heat medium temperature of the heat dissipation equipment is the saturation temperature under this pressure. The specific volume of steam in a steam heating system is much larger than that of hot water. The phenomenon of heating lag before and after heating can be greatly reduced. As the heat medium of the heating system, steam has a wide range of applications.    Steam is used in the heat dissipation equipment of the system to condense into water to release heat.    The heat q released when each 1kg of steam condenses in the heat sink can be calculated by the following formula:   Q = i-q kJ/kg degree of supercooling    When the steam entering the heat sink is saturated steam and the condensate flowing out is saturated condensate:   Q = r kJ/kg    If high temperature water 130/70 ℃ is used for heating, the heat released per 1kg of water is Q=c△tG=251.2kJ/kg. Using a steam gauge pressure of 200kPa for heating, the corresponding latent heat of vaporization r=2164kJ/kg.   2. When steam and condensed water flow in the heating pipeline, they will be accompanied by phase changes. The wet saturated steam produces condensed water along the way; the wet saturated steam may become dry saturated steam or superheated steam after being throttled by a valve, etc.; the condensed water re-vaporizes to produce "secondary steam". This causes the so-called "running,

Production process of aluminum light profile
26 Oct 2021

Cast Casting is the first process of aluminum production, the main process is: (1) Ingredients: According to the specific alloy grades to be produced, calculate the addition amount of various alloy components, and reasonably match various raw materials. (2) Smelting: The prepared raw materials are melted in the melting furnace according to the process requirements, and the slag and gas in the melt are effectively removed by degassing and slagging refining methods. (3) Casting: Under certain casting process conditions, the molten aluminum is cooled and casted into round casting rods of various specifications through a deep well casting system. Extrusion is a means of forming profiles. First, design and manufacture a mold according to the profile product section, and use an extruder to extrude the heated round cast rod from the mold. The commonly used grade of 6063 alloy also uses an air-cooling quenching process and subsequent artificial aging process during extrusion to complete the heat treatment strengthening. Different grades of heat-treatable and strengthened alloys have different heat treatment systems. Coloring (I will focus on the oxidation process first) Oxidation: The extruded aluminum alloy profile has a weak surface corrosion resistance, and it must be surface treated by anodic oxidation to increase the corrosion resistance, wear resistance and appearance of the aluminum. The main process is: (1) Surface pretreatment: Use chemical or physical methods to clean the surface of the profile to expose the pure matrix to facilitate obtaining a complete and dense artificial oxide film. It is also possible to obtain a mirror or matte (matt) surface by mechanical means. (2) Anodizing: The surface of the pretreated profiles will undergo anodization on the surface of the substrate under certain process conditions to form a dense, porous, and strong adsorption Al2O3 film. (3) Sealing: The pores of the porous oxide film formed after anodization are closed to enhance the anti-pollution, corrosion resistance and wear resistance of the oxide film. The oxide film is colorless and transparent. Using the strong adsorption of the oxide film before sealing, some metal salts are ads

Check the reason why the aluminum heat sink is not hot
05 Nov 2021

The aluminum heat sink is not hot, which may be one of the following reasons:     (1) The resistance is large. In a parallel system, this problem may occur when the radiator is replaced privately. The resistance is large, the hot water flow is small, and the heat dissipation is reduced;     (2) The heat medium water temperature is low, and the heat dissipation is small. The standard heat dissipation commonly used by our radiators is measured at the inlet temperature of 95°C, the outlet temperature of 70°C, and the room temperature at 18°C. If the inlet temperature of 70°C, the outlet temperature The heat dissipation is about 40% lower when the temperature is 55℃ and the room temperature is 18℃;     (3) The water pressure is low. At the far end or high place of the parallel system, the water pressure is low, the hot water is insufficient, and the heat dissipation is low;     (4) Different water inlet and outlet connection methods also reduce heat dissipation. It is best to enter and exit from the top, and the radiator is lowered by about 20% when tested under different conditions;     (5) Air blocking, you can open the air-conditioning valve to exhaust the air in the radiator and then close it;     (6) Partial blockage in the radiator;     (7) There are fewer radiator fins designed or installed, and the total heat dissipation capacity is not enough;     (8) There is a heating cover, which often reduces the heat dissipation by about 20%;     (9) The doors and windows are ventilated.     At present, the commonly used heat sink materials are copper and aluminum alloy, both of which have their own advantages and disadvantages. Copper has good thermal conductivity, but the price is more expensive, the radiator is difficult to process, the weight is too large (many pure copper radiators exceed the weight limit of the CPU), the heat capacity is small, and it is easy to oxidize.     The radiator is a collective term for a series of devices used to conduct and release heat. At present, radiators mainly include heating radiators and computer radiators. Amo