An asymmetric main rotor with an inclined surface

Abstract

An asymmetric main rotor with an inclined surface, comprising a rotor shaft, a rotor axis, an impeller and a tooth tip, characterized in that: the inclined surfaces are respectively arranged on the upper impeller and the lower impeller, the upper end of the inclined surface starts at the tooth tip, and the lower end of the inclined surface ends in a curve, one side of the curve starts between the first outer curve of the tooth top and the second outer curve of the tooth top, and the other side ends between the second inner curve of the tooth top and the third inner curve of the tooth top, and the side of the inclined surface close to the rotor shaft is higher than the side away from the rotor shaft; the upper impeller and the lower impeller are symmetrical with the rotor axis as the origin and are connected to each other, and by arranging the inclined surface on the side of the non-fixed end of the impeller, the problem of mechanical structure interference caused by thermal expansion of the material is avoided during high temperature and high speed operation of the rotor.

Description

Technical Field

[0001] The invention relates to the field of air compressors, in particular to an asymmetric main rotor with an inclined surface. Background Art

[0002] Roots blower is a driven fluid machine that boosts low-pressure gas to high-pressure gas. The principle is a rotary compressor that uses two blade-shaped rotors to make relative motion in the cylinder to compress and transport the gas.

[0003] When the Roots blower is running at high speed for a long time, the internal temperature is high. During the high temperature and high speed operation, the compressor rotor usually undergoes thermal expansion, which causes the rotor size to change, and then interferes with other mechanical structures in the working chamber, increasing the wear rate of the rotor and the failure rate of the compressor.

[0004] Invention patent content

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An asymmetric main rotor with an inclined surface comprises a rotor shaft, a rotor axis, an impeller and a tooth tip.

[0007] The right side of the impeller is composed of an upper impeller and a lower impeller;

[0008] The outer contour of the upper impeller is composed of 13 curves: an outer curve of the tooth root, a first outer curve of the tooth top, a second outer curve of the tooth top, a third outer curve of the tooth top, a fourth outer curve of the tooth top, a first inner curve of the tooth top, a second inner curve of the tooth top, a third inner curve of the tooth top, a first inner curve of the tooth root, a second inner curve of the tooth root, a third inner curve of the tooth root, a fourth inner curve of the tooth root, and a fifth inner curve of the tooth root;

[0009] The tooth root outer curve, the tooth top first outer curve, the tooth top second outer curve, the tooth top third outer curve and the tooth top fourth outer curve are smoothly connected in sequence;

[0010] The first inner curve of the tooth top, the second inner curve of the tooth top, the third inner curve of the tooth top, the first inner curve of the tooth root, the second inner curve of the tooth root, the third inner curve of the tooth root, the fourth inner curve of the tooth root and the fifth inner curve of the tooth root are also smoothly connected in sequence;

[0011] One end of the fourth outer curve of the tooth top is connected to one end of the first inner curve of the tooth top in an unsmooth manner, the tooth tip is a connection angle, and the connection angle is an acute angle;

[0012] Inclined surfaces are respectively arranged on the upper impeller and the lower impeller, wherein the upper end of the inclined surface starts at the tooth tip, and the lower end of the inclined surface ends at an inclined surface curve, one side of the inclined surface curve starts between the first outer curve of the tooth top and the second outer curve of the tooth top, and the other side of the inclined surface curve ends between the second inner curve of the tooth top and the third inner curve of the tooth top, and the side of the inclined surface close to the rotor shaft is higher than the side away from the rotor shaft;

[0013] The upper impeller and the lower impeller are centrally symmetrical with the rotor axis as the origin and are connected to each other.

[0014] In a preferred embodiment of the present invention, the lower end of the inclined surface is smoothly connected to the adjacent surface.

[0015] In a preferred embodiment of the present invention, the rotor shaft is a shaft body with a circular cross-section, the left end of the shaft body is a fixed end, the right end of the shaft body is a non-fixed end, and the radius of the cross-sectional circles at the left and right ends of the shaft body is smaller than the radius of the middle cross-sectional circle.

[0016] In a preferred embodiment of the present invention, the rotor shaft is provided with a fixed end step and an impeller first step in sequence from the fixed end to the impeller direction, and a non-fixed end first step, a non-fixed end second step and an impeller second step in sequence from the non-fixed end to the impeller direction.

[0017] In a preferred embodiment of the present invention, the fixed end and the fixed end step are transitioned in the form of a chamfered angle, the fixed end step and the impeller first step are transitioned in the form of a chamfered right angle, the non-fixed end and the non-fixed end first step are transitioned in the form of a chamfered angle, and the non-fixed end first step, the non-fixed end second step and the impeller second step are transitioned in the form of a chamfered right angle.

[0018] In a preferred embodiment of the present invention, a fixed end groove is provided on the side wall of the fixed end, and a non-fixed end first groove is provided on the side wall of the non-fixed end, and the non-fixed end first groove is spanned between the non-fixed end first step and the non-fixed end second step.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides an asymmetric main rotor with an inclined surface, which avoids the problem of mechanical structure interference caused by thermal expansion of materials during high-temperature and high-speed operation of the rotor by arranging the inclined surface on the side of the non-fixed end of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0022] Figure 1 It is a perspective view of the present invention.

[0023] Figure 2 It is a rear view of the present invention.

[0024] Figure 3 It is a right side view of the present invention.

[0025] Figure 4 It is the front view of the present invention.

[0026] Figure 5 It is a partial enlarged view of the inclined surface structure of the present invention. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] The detailed structure of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0029] refer to Figure 3 The right side of the impeller 1 is composed of an upper impeller 10 and a lower impeller 20, and the upper impeller 10 and the lower impeller 20 are symmetrical with the rotor axis 43 as the origin. The upper impeller 10 is composed of 13 curves: an outer curve 15 of the tooth root with the center of curvature located on the inside, a first outer curve 14 of the tooth top with the center of curvature located on the outside, a second outer curve 13 of the tooth top with the center of curvature located on the inside, a third outer curve 12 of the tooth top with the center of curvature located on the inside, a fourth outer curve 11 of the tooth top with the center of curvature located on the inside, a first inner curve 21 of the tooth top with the center of curvature located on the inside, a second inner curve 22 of the tooth top with the center of curvature located on the inside, a third inner curve 23 of the tooth top with the center of curvature located on the inside, a first inner curve 24 of the tooth root with the center of curvature located on the outside, a second inner curve 25 of the tooth root with the center of curvature located on the outside, a third inner curve 26 of the tooth root with the center of curvature located on the outside, a fourth inner curve 27 of the tooth root with the center of curvature located on the outside, and a fifth inner curve 28 of the tooth root with the center of curvature located on the outside.

[0030] Among them, the outer curve 15 of the tooth root, the first outer curve 14 of the tooth top, the second outer curve 13 of the tooth top, the third outer curve 12 of the tooth top, and the fourth outer curve 11 of the tooth top are smoothly connected in sequence; the first inner curve 21 of the tooth top, the second inner curve 22 of the tooth top, the third inner curve 23 of the tooth top, the first inner curve 24 of the tooth root, the second inner curve 25 of the tooth root, the third inner curve 26 of the tooth root, the fourth inner curve 27 of the tooth root, and the fifth inner curve 28 of the tooth root are also smoothly connected in sequence; one end of the fourth outer curve 11 of the tooth top is not smoothly connected to one end of the first inner curve 21 of the tooth top, the connection point is the tooth tip 10a, and the connection angle is an acute angle.

[0031] The right side surface formed by the upper impeller 10 and the lower impeller 20 moves vertically along the rotor shaft 4 to form the entire impeller 1.

[0032] refer to Figure 1 , Figure 4 and Figure 5 When the rotor is running at high temperature and high speed, the impeller 1 will expand due to the influence of temperature. Among them, the thermal deformation of the tooth tip 10a is the largest. For this reason, a slope 31a is provided on the right side of the impeller 1 away from the fixed end 41. The upper end of the slope 31a starts from the tooth tip 10a, and the lower end of the slope 31a ends at a slope curve. One side of the slope curve starts between the first outer curve 14 of the tooth top and the second outer curve 13 of the tooth top, and the other side of the slope curve ends between the second inner curve 22 of the tooth top and the third inner curve 23 of the tooth top. The lower end of the slope 31a is smoothly connected to the adjacent surface. The side of the slope 31a close to the rotor shaft 4 is higher than the side away from the rotor shaft 4, so as to reserve space for material expansion and avoid interference caused by thermal expansion. No slope is provided on the left side of the impeller 1, so as to maximize the sealing performance in the working chamber.

[0033] The rotor shaft 4 is a shaft body with a circular cross section, and the radius of the cross sections at both ends is smaller than the radius of the middle cross section. The left end of the rotor shaft 4 is a fixed end 41, and the right end is a non-fixed end 42. When the rotor is running at high temperature and high speed, the rotor shaft 4 will expand and deform due to heat. This arrangement leaves a certain amount of space margin for thermal expansion to avoid interference with mechanical mechanisms.

[0034] The impeller 1 is also arranged in the middle of the rotor shaft 4. The rotor shaft 4 is provided with a fixed end step 41b and an impeller first step 41c in sequence from the fixed end 41 to the impeller 1. Synchronously, the cross-sectional circular radius of the rotor shaft 4 also increases from the fixed end 41 to the impeller 1. The fixed end 41 and the fixed end step 41b are transitioned in the form of a chamfered angle, and the fixed end step 41b and the impeller first step 41c are transitioned in the form of a chamfered right angle. Similarly, the rotor shaft 4 is provided with a non-fixed end first step 42c, a non-fixed end second step 42d and an impeller second step 42e in sequence from the non-fixed end 42 to the impeller 1. The cross-sectional circular radius of the rotor shaft 4 also increases from the non-fixed end 42 to the impeller 1. The non-fixed end 42 and the non-fixed end first step 42c are transitioned in the form of a chamfered angle, and the non-fixed end first step 42c, the non-fixed end second step 42d and the impeller second step 42e are transitioned in the form of a chamfered right angle.

[0035] Combined with reference Figure 2 A fixed end groove 41a is also provided on the side wall of the fixed end 41, and the groove 41a can be used for fixing with the bearing / sleeve. A non-fixed end first groove 42a is provided on the side wall of the non-fixed end 42, and a non-fixed end second groove 42b is provided across the non-fixed end first step 42c and the non-fixed end second step 42d.

Claims

1. An asymmetric main rotor with an inclined surface, comprising a rotor shaft, a rotor axis, an impeller and a tooth tip, characterized in that: The right side of the impeller is composed of an upper impeller and a lower impeller; The outer contour of the upper impeller is composed of 13 curves: an outer curve of the tooth root, a first outer curve of the tooth top, a second outer curve of the tooth top, a third outer curve of the tooth top, a fourth outer curve of the tooth top, a first inner curve of the tooth top, a second inner curve of the tooth top, a third inner curve of the tooth top, a first inner curve of the tooth root, a second inner curve of the tooth root, a third inner curve of the tooth root, a fourth inner curve of the tooth root and a fifth inner curve of the tooth root; The tooth root outer curve, the tooth top first outer curve, the tooth top second outer curve, the tooth top third outer curve and the tooth top fourth outer curve are smoothly connected in sequence; The first inner curve of the tooth top, the second inner curve of the tooth top, the third inner curve of the tooth top, the first inner curve of the tooth root, the second inner curve of the tooth root, the third inner curve of the tooth root, the fourth inner curve of the tooth root and the fifth inner curve of the tooth root are also smoothly connected in sequence; One end of the fourth outer curve of the tooth top is connected to one end of the first inner curve of the tooth top in an unsmooth manner, the tooth tip is a connection angle, and the connection angle is an acute angle; Inclined surfaces are respectively arranged on the upper impeller and the lower impeller, wherein the upper end of the inclined surface starts at the tooth tip, and the lower end of the inclined surface ends in an inclined surface curve, one side of the inclined surface curve starts between the first outer curve of the tooth top and the second outer curve of the tooth top, and the other side of the inclined surface curve ends between the second inner curve of the tooth top and the third inner curve of the tooth top, and the side of the inclined surface close to the rotor shaft is higher than the side away from the rotor shaft; The upper impeller and the lower impeller are centrally symmetrical with the rotor axis as the origin and are connected to each other.

2. An asymmetric main rotor with an inclined surface as claimed in claim 1, characterized in that: The lower end of the inclined surface is smoothly connected to the adjacent surface.

3. The asymmetric main rotor with an inclined surface as claimed in claim 1, characterized in that: The rotor shaft is a shaft body with a circular cross section, the left end of the shaft body is a fixed end, the right end of the shaft body is a non-fixed end, and the radius of the cross-sectional circles at the left and right ends of the shaft body is smaller than the radius of the middle cross-sectional circle.

4. The asymmetric main rotor with an inclined surface as claimed in claim 3, characterized in that: The rotor shaft is provided with a fixed end step and an impeller first step in sequence from the fixed end to the impeller direction, and a non-fixed end first step, a non-fixed end second step and an impeller second step in sequence from the non-fixed end to the impeller direction.

5. The asymmetric main rotor with an inclined surface as claimed in claim 4, characterized in that: The fixed end and the fixed end step are transitioned in the form of a chamfered angle, the fixed end step and the impeller first step are transitioned in the form of a chamfered right angle, the non-fixed end and the non-fixed end first step are transitioned in the form of a chamfered angle, and the non-fixed end first step, the non-fixed end second step and the impeller second step are transitioned in the form of a chamfered right angle.

6. The asymmetric main rotor with an inclined surface as claimed in claim 4, characterized in that: A fixed end groove is arranged on the side wall of the fixed end, a non-fixed end first groove is arranged on the side wall of the non-fixed end, and the non-fixed end first groove is arranged across between the non-fixed end first step and the non-fixed end second step.

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