1. Compact square form-factor outdoor high-power floodlight and Wall Washer for architectural and landscape lightings. Flood Light,LED Flood Light,Architecture Flood Light,High Power Flood Light,Addressable Flood Light,Anti-clare LED Flood Lights,Narrow Beam Angle Flood Light StrongLED Lighting Systems (Suzhou) Co., Ltd. , https://www.strongledcn.com
2. Cree or Lumileds LEDs in wide ranges of whites, tunable whites, mono colour,RGB, RGB+W and wide to narrow (3°) beam angles.
3. High brightness contrast level for smooth and consistent color change effect.
4. Extruded aluminum alloy body with high efficient heat dissipation fins, protective vent and clear glass diffuser.
5. Easy and flexible installation with adjustable 60° tit and rotatable mounting base.
6. AC110~220V or DC24V input voltage, Integrated AC power driver. DMX control with auto addressing function.
7. Rated IP 66
The basic theory of vane pump and fan Pump and fan to discuss the principle and performance is to study the fluid flow in the pump and fan law to find out the relationship between the fluid flow and the flow of parts geometry to determine the appropriate Flow path shape to achieve the required hydraulic (pneumatic) performance. Fluid flow through the pump and fan over the flow of components in the table below. Vane pump and fan over-current components operating characteristics of the role of motion analysis and research suction chamber fixed immobile fluid to the working impeller is relatively simple and relatively easy impeller rotation to complete the conversion of energy is more complex and difficult extrusion chamber fixed immobile fluid Pressing out the pipeline is relatively simple and easy. It is easy to see from the above table. To carry out the research on the basic theory of vane pump and fan, the main energy should be focused on the research of the fluid flow law in the impeller runner. §1-1 Fluid Flow Analysis in the Impeller I. Flow Analysis of the Fluid in the Centrifugal Impeller (I) Projection of the Impeller Flow Path and Its Flow Assumption Assumptions 1. The Impeller Flow Path Projection Figure 1-1 shows some Centrifugal impeller runner projection. Left part of the figure (not to look at the connection between the front and rear cover) shows the shape of the impeller front and rear cover; the right part of the figure (I have not seen the first point I, II ...) -1 axial projection of the impeller, plane projection and axial cross-sectional line Figure 1 - front cover; 2 - rear cover; 3 - leaves; 4,5 - blade inlet and outlet to cut off before The flat projection of the impeller obtained after the cover plate, you can see the plane projection of the blade surface. In order to see the blade surface shape, often attached to the axial (also known as meridian plane) projection map. The axial projection of an impeller is a diagram obtained by projecting a series of points on an impeller blade onto the same axial plane by rotational projection. The approach is to first project a set of lines connecting the axial planes of lines I, II ... with the impeller blades on the right (for ease of description, set the blades infinitely thin) onto the vertical axial plane OO 'using a rotation projection method , And then projected to the left, can be obtained with this set of intersection line shape exactly the same axial projection line (as shown on the left front and rear cover connection between the line), that impeller axial projection . The axial projection and the plane projection of the impeller can clearly express the geometric shape of the centrifugal impeller, which has important practical significance and value in the manufacture of the model and the localization of the imported equipment. In order to describe and analyze the convenience, usually only the axial projection and plane projection of the impeller simply painted as shown in Figure 1-2. 2. Flow Analysis Assuming that the flow of fluid in the impeller is rather complicated, in order to analyze the flow rule, the following assumptions are often made: (1) The blade in the impeller is infinitely infinitely thin, that is, the blade of the impeller is considered to be some non-thickness bone line (Or type line). Constrained by the vane lines, the trajectories of the fluid micelles exactly coincide with the vane lines. (2) the fluid is the ideal fluid, that is, ignoring the viscosity of the fluid. Therefore, the flow loss in the impeller due to the non-uniform velocity field due to the viscosity can be ignored for a moment. (3) Flow is steady flow, ie the flow does not change with time. (4) The fluid is incompressible, and this is not very different from the actual situation, because the liquid volume changes very little pressure difference is very small, and the gas pressure drop is very small volume changes are often negligible. (5) The flow of fluid in the impeller is an axisymmetric flow. That is, on the same radius of the circle, the fluid micelles have the same size of the speed. That is to say, the shape of the streamlines in each laminar flow surface (the flow surface is the surface formed by one revolution of the flowline about the axis of the impeller) is exactly the same, so only one streamline need to be studied for each flow surface. (B) the movement of the fluid in the impeller and its speed Triangle 1, the movement of the fluid in the impeller and its speed Triangular impeller rotation, the fluid on the one hand and the impeller for rotation, that implicate the movement, the speed is called the implicated speed, with that ; At the same time in the impeller flow along the leaves outward flow, that is, the relative movement, the speed is called the relative speed, said. Therefore, the fluid movement in the impeller is a compound movement, that is, absolute movement, the speed is called absolute speed, as shown in Figure 1-3. Since the velocity is a vector, the absolute velocity equals the vector sum of the entrainment velocity and the relative velocity, ie: = = Figure 1-3 Fluid movement within the impeller (a) Circumferential movement (b) Relative movement (c) Absolute movement From this A vector of three velocity vectors is called a velocity triangle or velocity map, as shown in Figure 1-5. The velocity triangle is the basis for studying the energy transformation of the fluid in the impeller and its parameters. The velocity triangles shown in Figure 1-5 can be made at any point in the flow path of the impeller. However, when the research on one-dimensional flow of fluid in the impeller usually adopts one-dimensional flow, it is mainly to know the fluid at the impeller blade inlet and outlet Case. Because the speed triangle from these two places can compare the speed of the fluid before and after the impeller, so as to know the energy obtained after the fluid flows through the impeller. In order to distinguish the two parameters, the subscripts "1, 2" are used to indicate the impeller blade inlet and outlet parameters respectively; and the subscript "ï‚¥" is used to indicate the parameter of the blade with infinite and infinite infinity. In velocity triangles, define: Absolute velocity ï¡ = ïƒ (,); Flow angle ï¢ = ïƒ (, -); Blade mounting angle ï¢y = ïƒ (blade tangent direction, -). Obviously, when the fluid flows along the profile of the blade, the flow angle is equal to the mounting angle, ie ï¢ = ï¢y. In addition, in order to facilitate the calculation, often the absolute velocity is decomposed into two mutually perpendicular velocity components: one is the projection in the radial direction, expressed by ïµr, ïµr = ïµsinï¡, called the radial velocity; one is The projection in the circumferential tangential direction, expressed by ïµu, ïµu = ïµcosï¡, is called circumferential partial velocity, as shown in Figure 1-5. 2, the calculation of the speed triangle In the speed triangle, as long as the three known conditions can be made. According to the pump and fan design parameters used, you can easily determine the u, ïµ r and ï¡ 1, ï¢ 2 corner to make the speed triangle. The method is as follows: (1) The circumferential speed u is: ï¬ u = (1-1) Where D - the diameter of the impeller (for the import and export of speed triangle, respectively, D1, or D2, Impeller speed, r / min. (2) Radial speed of absolute speed ïµr is: ï¬ ïµr = (1-4) where qVT - the theoretical flow, that is, the flow through the impeller, m3 / s; b - the width of the impeller blades, m ; ï¹ - crowding coefficient is to consider the blade thickness of the crowd of the degree of crowding coefficient, its value is equal to the actual effective flow area and non-leaf flow area ratio for the pump, import, export crowding coefficient were: ï¹1 = 0.75 ~ 0.88; ï¹2 = 0.85 ~ 0.95. (3) ï¢2 and ï¡1 angle when the blade infinitely long, ï¢ 2 = ï¢ 2y; and ï¢ 2y in the design can be selected based on experience. The same ï¡ 1 can also be based on experience, inhalation conditions and design requirements set. In determining u2, ï¢2, ïµ 2r, you can make a proportionate exit speed triangle, also identified u1, ï¡1, ïµ 1r, you can press