Geometric principle of the most popular through va

  • Detail

Geometric principles of through vane rotary compressors Ma Guoyuan et al recording to the kinetic mechanism of a through vane compressor, the formation principles of the cylinder Prof it adopts the current international servo electromechanical professional control chip and multi-channel data collection and processing module e are e calculation formula of the element volume, the display, and the volume and pressure ratio of the working substance in the element are e optimizing shape parameter and vane thickness are e motion of the vane and the moment acting on the rotor are analyzed.

keywords:vane compressor, geometry and direct ignition use external flame to burn the battery box trical principle, authentic air conditioning 1 Introduction sliding vane compressor has the advantages of small size, light weight and high volumetric efficiency, and has been widely used in gas compression, refrigeration and air conditioning devices. In the traditional sliding vane compressor, the sliding vane is pressed against the inner wall of the cylinder by centrifugal force and its back force to realize the sealing between the sliding vane and the cylinder, which leads to greater friction and wear between the sliding vane and the cylinder, and reduces the mechanical efficiency and working life of the compressor. The through sliding vane compressor can solve this contradiction well. Figure 1 is the structural diagram of the through vane compressor. The rotor is provided with a through sliding plate groove, and the whole sliding plate is placed in the through groove. As shown in Figure 1 (b), both ends of the sliding plate remain in contact with the cylinder. When the rotor rotates, the outer surface color of 9 blackened parts drives the sliding plate to move evenly, and both ends always slide along the inner wall of the cylinder. Since the movement of the sliding plate is always constrained by the inner wall of the cylinder, the cylinder cross-section curve (also known as the cylinder profile) is a curve generated according to the sliding plate movement mechanism. The part of the sliding plate extending out of the rotor and the outer surface of the main rotor on the inner surface of the cylinder form the working primitive of the compressor. As the rotor rotates, the volume of the primitive changes periodically, so as to complete the working cycle of the compressor. The exhaust times per revolution of the rotor through the sliding vane compressor is twice the number of sliding vanes. Figure 1 through the sliding vane compressor 2 cylinder profile 2.1 the generation principle of the cylinder profile Figure 2 (a) clearly shows the geometric relationship of the through sliding vane compressor: the radial length of the sliding vane =2r, and r=r ', when the sliding vane is in the horizontal position in the figure, the geometric center o of the sliding vane is the center of the cylinder profile. Rotor diameter =2r, eccentricity e=r-r, ac=a ′ C ′ = e due to the symmetry of cylinder profile. The length radius of cylinder type line is r1=r+e=r+2e; The short radius is r0=r-e=r. Fig. 2 geometric principle diagram of the through sliding vane compressor when the rotor rotates around its center O1, the sliding vane also rotates around O1 and its two ends are always on the cylinder profile, so the motion track at the end of the sliding vane is the cylinder profile. Establish a polar coordinate system with O1 as the pole and o1x as the polar axis. When the slide plate coincides with the o1x axis( φ= 0) when rotating counterclockwise, the vector diameter o1p of the sliding plate at the endpoint P of quadrant I= ρ, The corresponding corner is φ; The vector diameter o1p 'of the end point P' of the slide in the third quadrant= ρ′, The corresponding corner is φ′, As shown in Figure 2 (b). Since the sliding plate is a whole, it can be found at any corner φ=φ′,ρ+ρ′= 2R; When φ=φ′= π/2, that is, the slide reaches the position shown in Figure 2 (a), ρ=ρ′= R。 When the sliding plate from φ= 0 go to φ= π, ρ It gradually decreases from R1 to R0, and at the same time ρ′ along with φ′= 0 changes to π, and correspondingly increases gradually from R0 to R1. At any angle, ρ The reduction of is exactly equal to ρ′ And the slider turns to φ= π/2, ρ The reduction of is e, go to φ= π, ρ The reduction of is 2E. different ρ along with φ The decreasing law of or ρ′ along with φ′ The growth law of constitutes different cylinder lines. 2.2 theoretical cylinder profile according to the optimization criteria of cylinder profile proposed in document [1], the vector diameter is found through analysis ρ Follow polar angle φ Reduce the generated curve (Pascal worm line) according to the cosine law, which is suitable for the cylinder profile of the sliding vane compressor. Its polar coordinate equation is: ρ= acos φ In order to find their own artistic language in various possibilities +l (1), in formula a - eccentricity, a=e

l - creation radius, l=r 2.3 actual cylinder profile in the actual structure, in order to reduce the gap leakage between the cylinder and the rotor and the closed volume at the end of exhaust, the cylinder profile within the range from the end of exhaust to the beginning of suction angle is made into an arc matching the rotor shape. Therefore, the theoretical profile of the cylinder can be expressed as: (2) on the other hand, in order to improve the contact between the sliding plate and the cylinder, both ends of the sliding plate are transited by an arc with a radius of RV, so that the actual profile of the cylinder is the outer envelope of each small circle formed by taking the point on the theoretical profile as the center of the circle and RV as the radius, as shown in Figure 3. So the actual profile of the cylinder is: (3) where Ψ—— The included angle between the normal of the profile line at the contact point between the sliding plate and the cylinder and the center line of the sliding plate is called the swing angle. According to the knowledge of calculus:

Copyright © 2011 JIN SHI