Rotary vane pump stator inner contour curve design method based on normal distribution function

Abstract

The invention discloses a rotary vane pump stator inner contour curve design method based on a normal distribution function. The method comprises the following steps: step 1, determining initial values of an arc radius B, a radius increment e, a rotary vane and stator inner width matching top arc radius r and a standard deviation [sigma] according to design requirements; step 2, calculating the arc length rho corresponding to each theoretical angle [gamma] of the arc; 3, constructing a theoretical inner contour curve; 4, determining a correction coefficient k, and calculating a correction angle [beta]; 5, calculating the actual arc length [eta]; 6, solving each actual angle [epsilon] corresponding to the actual arc length eta; 7, constructing an inner contour curve; and step 8, judging whether the inner contour curve meets the design requirement or not, if so, taking the inner contour curve obtained in the step 7 as a final inner contour curve, and if not, repeating the steps 1-7. According to the method, the adverse effect on the movement rule of the actual meshing point due to the fact that the thickness of the rotary vane cannot be ignored in the actual movement process of the rotary vane can be eliminated; and the speed and acceleration maximum value positions can be adjusted according to the speed increment and the rotating speed. By integrating the advantages, abrasion isreduced, the mechanical impact influence is reduced, and therefore the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of rotary vane pumps, and in particular relates to a method for designing a stator inner width curve of a rotary vane pump based on a normal distribution function. Background technique [0002] The rotary vane pump has the advantage of large displacement per unit volume. The design of the inner wide curve of the rotary vane pump stator is the core technology of the rotary vane pump. Generally, constant acceleration curves or multi-section curve splicing methods are used for design. However, after the engine speed increases , because the acceleration, jerk, and jerk of these two curves are discontinuous, there will be impact during the motion process, especially at the transition of the curve, which will shorten the life of the friction pair and affect the strength design of the moving parts. If you use a higher-order equation, although it can be Solve the problem of acceleration and jerk, but it is impossibl...

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Problems solved by technology

[0004] Moreover, the existing rotary vane pump curves are all multi-segment curves meshed or generated without considering the actual thickness of the rotary vane. In actual use, the multi-segment curves will have mechanical impact due to excessive positions, which will reduce the service life of the product.

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