TWI240781B - Screw rotor mechanism - Google Patents

Abstract

The present invention relates to a screw rotor mechanism of which the rotor profile is formed by a curve generated by a rack, and in particular to a screw rotor mechanism having reasonably distributed torque and high efficiency, as well as a pair of screw rotors having such a profile. The screw rotor mechanism includes a pair of mutually engaged screw rotors. The pair of screw rotors has teeth alternated by grooves to rotate about parallel axes within a working space of a machine. One of the rotors is a female rotor, and the other is a male rotor. The objective of the present invention is to provide a rotor ensuring optimal engagement in order to form a screw rotor mechanism that features easy design of tooth profile, good efficiency and reasonable distribution of torque over the male and female rotors.

Description

! 240781 ---------V. Description of the invention (1). '&Quot; 一 " ------ ~ 一 " " ------ [Technical field to which this invention belongs的 ^ Ming is about a kind of second wheel protection, red rotor mechanism of the curve produced by the rack as the rotor, especially the evaluation mechanism with adjustable torque distribution and high efficiency, and one pair with this profile Spiral rotor. 1 Previous technology] Previous studies have shown that the effect of spiral rod profiles on the spiral rotor mechanism has a great impact. In the early 1970s, after the asymmetrical contours replaced the symmetrical arc contours, the compressor efficiency increased by 10. %, In recent years, in order to meet the requirements of reducing noise and saving energy, more considerations have been taken into the design of the linear shape, such as thermal deformation and deformation by force. Once a successful 50% rotor profile is set, Will make the performance of the whole set of spiral rotor mechanism more competitive in the market. The widely used spiral rotor mechanism has a rotor with helical ribs and grooves inserted between them to rotate around a parallel axis in the working space of the machine. One of the rotors is a female rotor. Some are located inside the pitch circle, while other small parts are located outside the Lang circle; the other rotor is a male rotor, and the main part of each rib is located outside the pitch circle, while other small parts are located Pitch circle inside. Several previous patents have shown the rotor wheel temples of such helical rotor mechanisms. These advanced technologies have fully discussed this type of profile, and have also greatly improved the operational performance of these mechanisms. For example, U.S. Patent Nos. 2 6 22 7 87, 3787154, 4412796, 4899992, and 4 0 6 6 0 2 etc. However, these pre-designs are traditionally used to generate the rotor profile. It is to define the main tooth profile curve on one rotor, and then create a corresponding common car profile on the other rotor according to the common car theory.

Page 6 1240781 V. Description of the invention (2) And 'these tooth shapes are not the best design for the outline of the rotor, and He Qiaobu 66 prostitute. +. A 0.15 has its practical and manufacturing shortcomings, recently Developed another method of tooth profile ▲, which is to define the main ^ on a rack with an infinite radius of curvature, and then create a two-rotor tooth profile, for example, the U.S. patent curve produces a curve, and then the MW publication Shape, such as U.S. Patent No. 46436 54 and U.S. Patent No. 96 1 028 9.2, which has the advantage that the linear shape of the denture rack can be used to create the conjugate male and female rotor profiles, and at each point above, it can be created A point corresponding to the linear shape of the rotor is created in the entire curve, and the straight line segment on the rack linear shape will be in the rotor and belong to the corresponding involute segment to ensure that the two rotors are close to each other near the pitch circle. The rolling contact is conducive to the transmission of torque, and at the same time, the rotor maintains a seal over the entire contact length under the condition of maintaining the blow hole. : With bigger And stronger cross-sectional area of the blade, will help distribute child Yao torque. Female rotor [Content of the invention] The conventional spiral rotor profile uses the male rotor tooth tip and rotation; iHi's sealed gas is compressed when it is compressed: The tooth thickness is insufficient to cause bending resistance The strength is too small, or the rotor is uneven due to the S force of the female 2 curve. • Plus = _ because the rotor will be thermally expanded and subject to the gas 7 and holding it, which will cause wear of the male rotor tooth top or male and female rotors. In addition, the formation of $ g affects the efficiency of the compressor. Bei Zhengjifa: In view of the fact that the existing spiral rotors are not perfect in design, they have been researched and improved. After continuous trials and tests, they have developed

Page 7 1240781 V. Description of the invention (3) --------------- One of the practical effects can meet the best efficiency, the torque is divided into two I, and the designed rotor, so that Constitute with Tai Invention Tree # ί Reasonable spiral rotor mechanism. The technology of the screw-rotor rotor mechanism of the present invention can be used on the machine's working outer door, such as from τ 、 tea, and there are several interlocking elements on each of the interlocking elements; The rotor is a male rotor: two = the cogging grooves can be interspersed with each other, in which the female rotor 'its profile is also produced by JJJ's 纟' · another-the rotor is the same as the snail provided by the invention 》 The advantages of the combined male and female rotor II + are that the two spray out each other. In this method, the profile can be produced by the -rack contour line. The value of bar 4 is added at the bottom of the rack by a ratio of the entire long axis to the short axis = degree round fox to protect the revolution: tooth m rotor tooth top generation-segment :: tooth: pressure angle and rotation of the female rotor ：: The left side of the profile can be allocated in accordance with 4: 2: the same as that of the male and female rotors; the rack profile can be obtained to: 5 ;: the strength of the non-rotating sub-mechanism can be adjusted. The appropriate spiral rotor can be used in M μ [本 发 ί 之 ::] To reduce ... and improve the efficiency Γ reactance, the spiral rotor mechanism of the present invention, it is necessary to Chen Ming Amendment without departing from the present invention :: If it is within the scope of the patent application according to this book. "The spirit of", you should still read the first and third drawings, the present invention < spiral rotor mechanism, including the first Page 8 1240781 V. Description of the invention (4) Including male rotor 1 〇 and female rotor 3 〇; Among them, the male rotor 丨 〇 has five spiral ribs 1 1 (only one complete rib is shown in the first figure) , And the same number of helical grooves 1 2 (only two are shown in the first figure), which have a pitch circle 14 and a rotating shaft 16. The rotor meshing with the male rotor 10 is a female rotor 30, The rotor 30 has a contour that can be engaged with the male rotor 10; 々 As shown in the second figure, the female rotor 30 has six spiral ribs 31 (only two complete ribs are shown in the second figure), and the equivalent Number of spiral grooves 3 2 (only one is shown in the second figure). With respect to the male rotor 10, the female rotor 30 has a pitch circle 34 and a rotating shaft 36. As shown in the third figure, when the two rotors are in the machine When the shells 41 cooperate and mesh with each other, the rotating shaft 16 of the male rotor 10 and the rotating shaft 36 of the female rotor 30 It is located on a common plane 40. Please refer to the fourth figure, the description of the formation of the outlines of the female rotor 30 and the male rotor 丨 〇 is as follows: Define the length of the center-to-center distance between the rotors 0.005 to 0.005 times; the length d2 The center-to-center distance between the rotors is 0.15 to 0.35 times. The center axis of the rotor 30 is used as the center of the rotor. The center-to-center distance is multiplied by the number of teeth of the rotor and divided by the number of teeth of the two rotors. 4. A radius with a length smaller than the radius of the pitch circle 34 is d2 as the tooth root circle 34b, and a radius with a length larger than the radius of the pitch circle 34 is d1 as the tooth tip circle 3 4a; The shaft 16 is the center of the circle. The center distance between the rotors is multiplied by the number of teeth of the male rotor and then divided by the sum of the number of teeth of the two rotors. The radius is the pitch circle i 4. 4a, and a tooth root circle 1 4b having a radius dl smaller than the pitch circle 4 and a circle 1 4b 'wherein' the circles 1, 4, 14a, 14b are circumscribed to the circles 34, 34b, 34a, respectively. Tooth circle 14a and root circle 34b and the plane formed by the rotating shafts 16, 36

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4〇 Intersect at point 50. Draw a vertical plane at the tangent point of the two circles. 40 == pitch line 60. Define a rack 70 whose tooth pitch is “the circumference of the male rotor 10W14 divided by the male rotor. 10 number of teeth; straight section; one side of the rack 70 with a length of 1 to 2 times dl as the radius rl to make a circle lc, the starting point 71a of the 0 arc 71 is tangent to the tooth tip line 60a, and the center of the circle is perpendicular to the square = square 〇. 3 ~ 〇. 5 times the tooth pitch, define the high-pressure side pressure angle u between 6. ~: between the starting point 71a of the arc, the end angle 7lb and the center of the circle t1 is defined as 90-U, so the end point 711 ^ It does not necessarily fall on the node line 60, it depends on u & rl, and if rl is too large, it will increase the leakage of compressed gas inside the compressor; if it is too small, it will cause processing difficulties; the degree of counterclockwise is 72 and the end point is taken Starting from point 71 b, draw a straight line (curve) 72a along the length of the angle u with the horizontal line less than 2 · 〇X d 1 -r 1; (as shown in the sixth circle, the pitch circle 34 in the figure is a schematic, non- Actual size) Extending a distance k greater than Γ1 from point 7 2 a along the normal direction of line 7 2 to get point 7 3a, extending the intersection in the opposite direction of the normal line of line 7 2 Line 6 0 at point 90 moves the initial position of pitch circle 34 to point 90 and fixes point 73a to pitch circle 34. The relative position of point 7 3a and pitch circle 34 remains unchanged during rolling. Scroll the pitch circle 34 from the initial position point 90 to the pitch line 60 and scroll down the range of 1/1 8 to 1/6 turns to the end point 1 00, and be fixed to the pitch circle 34 at point 7 3 a can draw a trajectory of a certain length. This trajectory is the cycloid 7 3 c. Find the cycloid (curve) 7 3 c. The equidistant line (curve) 7 3 is tangent to the straight line (curve) 7 2 at point 7 2 a. The extension distance k will determine the radius of curvature of the female rotor 30 tooth profile at the pitch circle 34.

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(As shown in the sixth figure, the pitch circle 4 in the figure is a schematic, non-actual size.) Extending a distance greater than rl along the normal direction of the end point 73b of the curve 73 to obtain a point 7 4a, the initial position of the pitch circle 14 Move to point 100 and fix point 7 "to the pitch circle 14. The relative position of point 74a and pitch circle 14 will remain the same during the rolling. The pitch circle 14 will be at the pitch from the initial position point 100. Scroll up on the line 60 from the range of 1/1 8 1/6 turns to the end point 丨 〇, and fixed to the pitch circle 丨 4 point 7 4 & you can draw a trajectory line with a special length, This trajectory is the cycloid W c,, and the cycloid isometric line 74 in the direction of the normal line of the cycloid (curve) 74c, so that the cycloidal isometric (curve) 74 and the cycloidal isometric (curve) 73 are at The point 73b is tangent, and the extension distance will determine the radius of curvature of the male rotor tooth shape at the tooth top circle 1 4 a; the pitch circle 14 and the life circle 34 are tangent to a point 800, with the point 800 as the center of the circle and the length d2 For the radius to obtain an arc (curve) 75 tangent to points 50 and 74b, the point "= an angle between the two ends 50 and 74b of the arc is used as the rack top to create a tooth top protection angle in the shape of a male rotor, angle Between 0. ~ 10. ;, The length of the equidistant line (curve) 73 and the cycloidal line (curve) 74 is so long as to be able to meet the condition that the contact point 73b is tangent and the normal of the end point 74b of the curve 74 can pass the point 80. Is the principle; 距 on the other side of the rack 7 〇 on the tooth top line 6 〇a from the point 7 丨 a a tooth pitch $ take point 7 9 a 'along the tooth top line 6 0 a take 0 · 〇2 ~ 0 · 〇6 times the center distance ^: a straight line (curve) 79 and get the end point 79b, the P of the straight line (curve) 79 will affect the female rotor 30 tooth thickness created, the longer the length, the greater the drought of the female rotor , Can withstand larger loads; the smaller the length, the thicker the tooth thickness of the female rotor, the smaller the load it can bear and the larger the amount of deformation,

1240781 V. Description of the invention (7) " " —-Make a circle 78a with a radius r2 of 1 to 5 times dl, the starting point 7 9b of the arc 78 is tangent to the top line 60a, and its center is in the vertical plane 4 〇 The lower tooth pitch is deducted by a distance of d1, and the low-pressure side pressure angle v is defined as 3 〇. ~ 4 5. The angle t2 between the start point 79b, the end point 78b, and the center of the arc is defined as 90. — V, so the end point 78b does not necessarily fall on the nodal line 60. It is determined by ¥ and r2. The radius will make it difficult to manufacture; and] Take the point 78b as the starting point and take it in the direction of the v angle with the horizontal line. Less than 6 times dl minus r2, draw a straight line (curve) 77 and get the end point. After finding point 77a and point 50, select the most appropriate elliptical arc 76. The choice of this arc 76 must meet the conditions for maintaining tangent continuity and point continuity at contact 50 and 77a. It is important that In order to meet the continuous performance of tangent and contact, the degree of freedom of the elliptical arc needs to be relaxed to meet the continuous condition. Therefore, the length of the ellipse major axis with a center distance of 0.5 to 3.5 is given in the design, and then the continuous condition is satisfied. The position of the center of the ellipse, the angle of rotation of the ellipse around the center of the ellipse, and the parameter range of the ellipse arc are obtained. As shown in the fifth figure, when the rack 70 moves horizontally along the pitch line 60 and the female rotor 30 makes its rotation axis 36 During relative rotation, the single tooth profile of the female rotor 30 can be obtained from the relative motion relationship and meshing conditions, and the curve on the rack 70 generates the corresponding female rotor 30 contour curve, each corresponding curve During the movement, it is fully meshed; s rack 7 0 moves horizontally along the pitch line 60 and the male rotor 丨 〇 rotates its rotating shaft 16 relatively, the outline of the male rotor 丨 〇 can be based on this relative motion relationship and Finding the meshing conditions, The rack 7〇 curve A rotor generates the corresponding profile of the curve 10, the curve corresponding to the mother strip is also fully in motion

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1240781 V. Description of the invention (8) Engagement; through the above, the following conclusions can be drawn: A? Rack 70 is composed of several curves; each curve can be adjusted appropriately. For example, you can change the length of the major and minor axes of the radius r 丨 and β, the length of each straight line, the angle point, u, v, and the extension. By this, you can get a suitable medium compressor, air compressor, ... ·Wait}. B) Through the same rack 70, it can be opened and shaped, and the generated male and Γ turns; the design of the male rotor and the female is simpler. Breaking this car in total will make the rotor C) adjust the properties on the rack by items such as A), and the rotors in different occasions will be pecked efficiently and the torque will be reasonably distributed to the male teeth. If: properly, ⑸ Male rotor 丨. The tooth shape is formed by the teeth: shape. When the line is in the creation movement (such as the fifth temple pair / curve, the corresponding combination belongs to the entire rack curve creation chart, shown in the upper figure), it is the same as the tooth root. Between circles 14b. And the profile of the female rotor 30 with a contour between the teeth E) is formed by the rack 70 curve to form the shape of the female rotor ^, and the rack 70 is making a movement between the lines (such as the first heart line, Corresponding combination belongs to the entire segment of the rack curve creation chart, as shown in the lower and middle figures.) When it is between the tooth root circle 34b and the t contours between the teeth, the ellipse length k, (such as cold rotor teeth) The use of subtooths for each curve will give you a complete apex circle on each curve and curve 14a

苐 Page 13 1240781_ Brief description of the drawing The first drawing is the outline drawing of the male rotor defined by the present invention. The second figure is a partial outline view of the mother rotor defined by the present invention. The third figure is an overall outline view of the engagement of the spiral rotor of the present invention. The fourth figure is a partially enlarged view of the rotor of the present invention. Figures A and B are coordinate diagrams of the relative movement of the rack and the male and female rotors. The sixth diagram is a cycloid formation diagram of the rack. [Comparison of component names and symbols in the figure] 10: Male rotor 30: Female rotor 1 1, 31: Spiral teeth 12 ', 32: Spiral grooves 1 4: Male rotor pitch circle 1 4a: Male rotor teeth Top circle 1 4 b: Male rotor tooth root circle 1 6, 3 6: Rotary shaft 3 4: Female rotor tooth circle 34a: Female rotor tooth circle 34b: Female rotor tooth root circle 40 Rotary plane 41 Cabinet 50 Tangent point 60 pitch line

Page 141240781 Brief description of the diagram 6 0a: Tooth line 7 0: Rack 71: Arc (curve) 7 1 a · Start point 7 1 b: End point 71 c: Circle 7 2: Straight line (curve) 7 2 a : Point 7 3: Cycloidal isometric lines (curves) 73a, 73b: Point 7 3 c: Cycloidal (curves) 7 3 d: Straight line 74: Cycloidal isometric (curves) 7 4 a, 7 4 b: Point 7 4 c: Cycloid (curve) 75: Arc (curve) 76 · • Ellipse (curve) 77: Straight line (curve) 77a: Point 78: Arc (curve) 7 8a · Circle 7 8b: Point 7 9 : Straight line (curve) 7 9 a · starting point

Page 15 1240781 Brief description of drawings 7 9 b: End point 80: Point 90: Point 1 0 0 '1 1 0: Point pi: Tooth pitch dl, d2: Length r 1, r2: Radius u: High pressure side pressure angle v: low pressure side pressure angle

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Claims (1)

1240781 1. The scope of the patent application-1 type of helical rotation T mechanism 'is a kind of helical rotor including: the tooth ring and the helical tooth groove female rotor provided between the teeth, and the outline of the male rotor and the female rotor Zhuan Xing rack is produced by the majority of the line segments < s rack starting. 'Where the distance is the tooth pitch (represented by Pl) teeth; = the distance between the end point and the distance; from I) It is the length of the pitch circle of the male rotor divided by the distance (represented by do) multiplied by the male spine pitch bismuth f. The number of teeth in the rotor is divided by the teeth of the two rotors = °; Lang® 1 Series' is based on the rotation axis of the female rotor as the center, the distance between the two rotors / center distance (d〇) = the number of teeth of the female rotor and then divided by the number of teeth of the two rotors as the radius. With the center as the center and the radius as the pitch circle minus 0. 15 ~ 0. 35 times the length of the centerline of the rotor (d2), the circle of the tooth of the mother rotor has a large radius with its center as the center 〇 ·. 05 ~ 〇.05 times the length of the center-to-center distance between the rotors ⑷) Made: The circle of the tooth top of the circle 'male rotor is centered on its center, and its pitch circle is 0.15 ~ 0.35 times the center length of the two rotors U2) The circle made; its; f is the circle made with its center as the center and its pitch circle radius minus 0.005 ~ 0.05 times the center-to-center distance U1). 2. The spiral rotor mechanism of item 1 of the patent application, in which the pitch circle of the eight sons, the tooth top circle and the tooth root circle are respectively connected to the female rotor pitch circle and the tooth top circle. The plane of the two rotor shafts (with the root of 40 mm), and the pitch line is tangent to two pitch circles and perpendicular to the plane. The Temple of the Wheel of Racks is composed of most of the following line segments (curves): Fascinated U) The first circle school (indicated by) Page 17 1240781 6. The circle of the patent application circle is tangent to the top circle of the female rotor and the root circle of the male rotor (indicated by ,, 6 〇a "), the center of the circle is located at At a distance from the plane, the radius is small (indicated by, r 1 ') is 1 of dl, the opening angle of the circular path is 90 to 2 times, and its starting point is the pressure angle on the side at a tangent 6 qa ( (2) The first curve (or straight line segment) whose starting point is the end point of the first circular solitary, its length is less than rl, and the high-pressure side pressure angle (u ); (3) The second curve (indicated by, 7 3 ”) is obtained by the following steps: at the end of the first curve, extending a distance k along the normal direction of the first curve to a point, and The end point draws a line perpendicular to the first curve (or straight line segment) (indicated by, 7 3 d ") to obtain a point on the nodal line (indicated by, 9 "); Move the starting point of the rotor circle of the mother rotor to this point 90. In this way, the pitch circle of the mother rotor is tangent to the node line at point 90 and The straight line 7 3 d intersects at a point (indicated by 7 3a ”), and the point 73a does not hold the relative position of the female rotor pitch circle, and turns the pitch circle to a point on the pitch line (indicated by '1 〇 ()), Then obtain a curved first cycloid corresponding to the trajectory of the point 73a, represented by, 73c "); find the first cycloid 7 = line, the equidistance line and the first- The end of the song (or straight line segment): then, this is the second curve; "Phase (4) the third curve (indicated by, 74 ") It is obtained by the following steps ... The end point of curve 7 3 is a normal line with a length of L to obtain a point (indicated by, 74a〃) * the height of the decrease is expressed by 72 / y) 2dl 1240781 6. The scope of patent application From the starting point to the point 100, connecting the points 7 4a and 100 ′ makes the relative position of the point 74a to the pitch circle of the male rotor unchanged; by turning the pitch circle of the male rotor on the pitch line, we obtain A curve corresponding to the trajectory of the point 7 4 a (second cycloid, represented by 74c); find the isometric line of the second cycloid 7 4 c, which The distance from the line and the end point of the second curve, this is the third curve; (5) the fourth curve (arc) (indicated by, 7 5 〃) the center of the circle of the arc is the revolution The point where the pitch circles of the child and the mother rotor are mutually circumscribed, and the length of the radius is d2; (6) the last line segment (or curve) (indicated by, 7 9 〃) which is a line along the straight line 6 0 a A line segment (or curve) defined by a point on the other side of the plane 4 〇, the distance between the point and the starting point of the first arc is p 1;, (7) —the end arc (with, , 7 8 〃) The circle of the arc is tangent to the line 60 a, and the distance between the center of the circle and the plane 40 is p 1-d 1 and the radius is 1 to 5 times dl (with ,,,, r 2々), the angle of the arc opening to the center of the circle is 9 (Γ-the pressure angle on the low pressure side (indicated by ,, ν "); (8) —the last curve (or straight line) (with, , 7 7 ") This curve starts at the end of the above-mentioned end arc 7 8 and its length is less than 6dl ~ r 2, the angle between the horizontal line and the pressure angle on the low pressure side (ν) Caimu et al. (9) the middle elliptical arc (indicated by, 7 6 〃) which connects the last curve (or straight line) 7 7 and the fourth 1240781 6. Scope of Patent Application Spring (arc) 7 5 and it meets the requirements of maintaining the tangent speed continuous and continuous contact at its two ends. 4. The spiral rotor mechanism according to item 3 of the scope of the patent application, wherein the center of the circle that produces the arc of the circle is a distance of 0.3 times to 0.5 times pl from the plane, and its radius is L1. 1 to 2 times the length. I. 5 · The spiral rotor mechanism according to item 3 of the patent application, where the high pressure pressure angle (u) is 6. ~ 15. ; And the low-pressure side pressure angle (ν) is 3045 °. 6 · The spiral rotor mechanism according to item 3 of the scope of patent application, wherein the length of the first curve (or line segment) is less than 2.0 d 1-r 1. 7 · If the spiral rotor mechanism of item 3 of the patent application scope, when the cycloid is created, the pitch circles of the female rotor and the male rotor are rotated 1 / 8th to 1 / 6th of a turn respectively. 8. The spiral rotor mechanism according to item 3 of the scope of patent application, wherein the opening angle of the fourth curve (arc) is less than 10 °. , And it is the protection angle of the male rotor tooth tip (indicated by, 〃). 9 · The spiral rotor mechanism according to item 3 of the scope of patent application, wherein the ellipse of the elliptical arc is given the length of the long axis of the ellipse of 0, 5 to 3, and 5 times the center distance, and then the continuous condition is satisfied. Find the position of the center of the ellipse, the angle of rotation of the ellipse about its center, and the parameter range of the ellipse arc interval. 10. The spiral rotor mechanism of item 3 in the scope of patent application, in which when more than one horizontal movement along the pitch line and the relative rotation of the mother rotor to its axis of rotation, the single tooth profile of the mother rotor can be relatively moved by this The relationship and the 0i composite condition are obtained, and the curve on the rack generates the corresponding female rotor profile curve Page 20 Page 21