Improvement of rotary vane compressor
In this paper, the geometry and motion of the vane compressor are analyzed and studied. The influence of the vane inclination on the speed and acceleration of the vane is discussed. The research shows that the relative motion speed and acceleration of the vane along the vane slot are related to the dip angle. The increase and increase, and the rate of change of the acceleration increases and is not uniform; when the inclination angle is 0, the relative movement speed and acceleration of the sliding piece along the sliding groove are minimum, and the rate of change of the acceleration is minimum and uniform.
Rotary vane compressor has great advantages over reciprocating compressors. It has few parts, light weight and good balance performance. It is especially suitable for single stage compression, and the refrigeration system with pressure not exceeding 5MPa, and other similar Medium and low pressure occasions. The sliding angle of the sliding vane compressor affects the movement of the sliding piece. When the rotor rotates, the sliding piece rotates with the rotor on the one hand, and on the other hand, it reciprocates linearly along the sliding groove, which is a composite plane motion. The difference in inclination causes the difference in the movement of the slide, which affects the friction and wear between the slide and the cylinder and the rotor, and also affects the performance and noise of the machine. In this paper, the relationship between the inclination angle and the motion of the sliding piece is analyzed, which provides a basis for selecting a reasonable sliding angle of the sliding piece.
1 The geometry of the sliding piece When the sliding vane compressor is working, the sliding piece rotates with the rotor, and its end is always attached to the inner wall of the cylinder by centrifugal force. Taking the OT point as the reference, the angle between OB and OT 11 cylinder 21 rotor 31 slider 41 backward tilting slide 51 radial sliding vane 61 forward tilting slide When the sliding vane is placed radially, if the rotor rotates evenly, then 2 The influence of the inclination of the sliding vane on the moving speed of the sliding vane When the rotor rotates, the sliding vane rotates evenly with the rotor on the one hand, and on the other hand, it reciprocates linearly along the sliding vane. We will analyze the sliding according to the decomposition and synthesis theorem of velocity. The speed of movement of the piece.
3 The influence of the inclination of the sliding piece on the acceleration of the sliding piece is shown in Fig. 3. When the sliding piece is at any position, the acceleration of the point B is a2, and the direction is from the point B to the center of the rotor. O. The relative acceleration a is to be obtained. The center line of the sliding groove, R is the radius of curvature of the point B of the cylinder line, and the direction of the tangential component a is along the tangential direction of the cylinder line of point B and points to the direction of rotation. The size is the direction of the Coriolis acceleration a perpendicular to the sliding direction. The center line of the slot is directed to the direction of rotation. The size is 11 cylinders. 21 The rotor 31 slides according to the acceleration synthesis theorem. a According to the projection theorem, a formula (3), (4) is substituted. From the above analysis, it can be seen that a The influence of the inclination angle H of the sliding piece is not large, and the influence of a by H depends on the change of v with H, that is, a increases with the increase of the inclination angle of the sliding piece, and is the smallest when the inclination angle is zero. The maximum value of HX0,a is smaller than the maximum value. The rate of change of HX0,a is large, and increases with the increase of the inclination of the sliding piece, and the variation is uneven; the rate of change of H is the smallest and uniform. From the working principle of the sliding piece, it is known that in order to avoid the impact and the contact stress is too large, the maximum value should be minimized, and the rate of change is small, so that the force of the sliding piece is good and does not cause a large Impact and contact stress.
4 Conclusions From the above analysis, the following conclusions can be drawn: (1) The relative motion velocity and acceleration of the sliding vane along the sliding slot increase with the increase of the inclination angle H, and the rate of change of the acceleration increases and is not uniform; when H=0 The relative movement speed and acceleration of the sliding piece along the sliding groove are minimized, and the rate of change of the acceleration is minimal and uniform. (2) In order to avoid excessive impact and contact stress on the slider, the inclination angle is 0.
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