Split type rotor of rotary vane compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a split type rotor of a rotary vane compressor, which comprises a shaft body and a rotating body, the shaft body comprises a long shaft section, an assembly section and a short shaft section which are sequentially arranged along the axis direction, the assembly section is provided with a tooth-shaped spline along the axis direction, and the rotating body is arranged on the assembly section in a pressing manner through the tooth-shaped spline; a first outer circular surface, a second outer circular surface and a first step surface are arranged at the end, away from the short shaft section, of the long shaft section, the shaft diameter of the first outer circular surface is smaller than that of the second outer circular surface, and the first step surface is located between the first outer circular surface and the second outer circular surface; a grinding undercut is formed in the connecting position of the first step face and the first outer circle face, two guide inclined faces and a guide arc face are formed, the two guide inclined faces are connected with one side of the first outer circle face and one side of the first step face respectively and are obliquely arranged towards the side where the first outer circle face is located, and the two sides of the guide arc face are connected with the other sides of the two guide inclined faces respectively. And the influence of machining abrasion on the assembly precision during mounting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a split rotor of a rotary vane compressor. Background Art

[0002] The rotary vane compressor is a common gas compression equipment. It draws gas into the compressor through the rotation of the rotor and discharges it after compression. It can provide continuous and stable gas flow and is widely used in air compression, refrigeration, chemical industry, oil and natural gas processing and other fields.

[0003] In the related art, the processing of the split rotor shaft requires several steps such as forging, rough turning, short shaft turning, long shaft turning, etc. After the processing is completed, it is also necessary to meet the requirements of one-way press fitting to ensure that no cracks are generated on the rotor after press fitting, and that there is sufficient connection strength between the shaft and the rotor; when processing the long shaft portion of the split rotor, the end face at the junction of the spline section and the shaft seal section is very narrow. During the grinding process on the grinder, the edges and corners of the grinding wheel contact the root of the step end face and wear to form a fillet, which affects the processing accuracy of the shaft shoulder, making it impossible for the adjustment gasket to be accurately seated during assembly, which has an adverse effect on the clearance adjustment.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a split rotor of a rotary vane compressor to avoid the influence of machining wear on the assembly accuracy during installation.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a split rotor of a rotary vane compressor, comprising: a shaft body and a swivel body, the shaft body comprising a long shaft section, an assembly section and a short shaft section arranged in sequence along the axial direction, the assembly section is provided with a 90° toothed spline along the axial direction, and the swivel body is press-fitted to the assembly section through the 90° toothed spline;

[0007] Wherein, the end of the long axis section away from the short axis section is provided with a first outer cylindrical surface, a second outer cylindrical surface and a first step surface, the axial diameter of the first outer cylindrical surface is smaller than the axial diameter of the second outer cylindrical surface, and the first step surface is located between the first outer cylindrical surface and the second outer cylindrical surface;

[0008] An overrun groove is provided at the junction of the first step surface and the first outer cylindrical surface, and the bottom of the overrun groove forms a first guiding inclined surface, a guiding arc surface and a second guiding inclined surface, the first guiding inclined surface is located on the side where the first step surface is located, and the second guiding inclined surface is located on the side where the first outer cylindrical surface is located, and the first guiding inclined surface and the second guiding inclined surface are both inclined toward the side where the first outer cylindrical surface is located, and the two sides of the guiding arc surface are respectively connected to the first guiding inclined surface and the second guiding inclined surface.

[0009] Furthermore, an involute spline is arranged on the first outer cylindrical surface, and the involute spline is extended along the axial direction from the end of the long axis section away from the overrun groove toward an end close to the overrun groove.

[0010] Furthermore, the long axis section is also provided with a third outer cylindrical surface, an inclined guide surface and a second step surface, the axial diameter of the third outer cylindrical surface is larger than the axial diameter of the second outer cylindrical surface, the two ends of the inclined guide surface are respectively connected to the second outer cylindrical surface and the third outer cylindrical surface, the second step surface is located at one end of the third outer cylindrical surface facing the short axis section, and the second step surface is connected to the assembly section.

[0011] Furthermore, a first center hole is provided at the end of the long axis segment facing away from the assembly segment. The first center hole is coaxially arranged with the long axis segment, and a cone angle of the first center hole is 58°.

[0012] Furthermore, a second center hole is provided at the end of the short axis segment away from the long axis segment, the second center hole is coaxially arranged with the short axis segment, and a cone angle of the second center hole is 58°.

[0013] Furthermore, the depth of the first center hole is set greater than the depth of the second center hole.

[0014] Furthermore, the swivel is provided with an axial hole, multiple sets of blade grooves and a back-off groove along the axial direction. The axial hole is coaxially arranged with the swivel, and the aperture of the axial hole is matched with the axial diameter of the assembly section. The blade groove is rectangular, and multiple blade grooves are symmetrically spaced around the center of the axial hole. The back-off groove extends from the inner side surface of the swivel toward the corresponding end of the blade groove, and the angles between adjacent blade grooves are equal.

[0015] Furthermore, the blade grooves and the tool retreat grooves are correspondingly provided in 5 groups.

[0016] Furthermore, the 90° toothed spline is connected to the shaft hole by interference fit, and the interference amount is 0.02 to 0.09 mm.

[0017] Furthermore, a protrusion is arranged on the inner side wall of one end of the shaft hole to form a stepped assembly surface, and the assembly surface is connected with the short shaft section by interference fit, and the interference amount is 0.015 to 0.065 mm.

[0018] The beneficial effects of the utility model are as follows: the utility model provides an overtravel groove with a guide bevel and a guide arc surface at the junction of the first step surface and the first outer cylindrical surface, which can provide an accommodation space for the edges and corners of the grinding wheel during processing, thereby avoiding contact with the first step surface to form a rounded corner, ensuring the accuracy of positioning of the split rotor after assembly, and ensuring the assembly accuracy; by setting a 90° tooth spline, good mechanical engagement is provided, ensuring the connection strength between the swivel and the shaft body, meeting the requirements of one-way press-fitting, and avoiding the risk of cracks during the press-fitting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a split rotor of a rotary vane compressor in an embodiment of the utility model;

[0021] Figure 2 It is a side view of the split rotor of the rotary vane compressor in the embodiment of the utility model;

[0022] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0023] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the structure of the shaft body in the embodiment of the utility model;

[0025] Figure 6 It is a structural schematic diagram of a rotating body in an embodiment of the utility model.

[0026] Figure numerals: 10, shaft body; 11, major shaft section; 11a, first center hole; 111, first outer cylindrical surface; 111a, involute spline; 112, second outer cylindrical surface; 113, first step surface; 114, overtravel groove; 114a, first guide slope; 114b, guide arc surface; 114c, second guide slope; 115, third outer cylindrical surface; 116, inclined guide surface; 117, second step surface; 12, assembly section; 12a, 90° tooth spline; 13, minor shaft section; 13a, second center hole; 20, swivel; 21, shaft hole; 21a, assembly surface; 22, blade groove; 23, back-cut groove. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figures 1 to 6 The split rotor of the rotary vane compressor shown in the figure comprises: a shaft body 10 and a rotor 20, the shaft body 10 comprises a long shaft section 11, an assembly section 12 and a short shaft section 13 arranged in sequence along the axial direction, the assembly section 12 is provided with a 90° tooth spline 12a along the axial direction, and the rotor 20 is press-fitted to the assembly section 12 through the 90° tooth spline 12a;

[0031] The end of the long axis section 11 away from the short axis section 13 is provided with a first outer cylindrical surface 111, a second outer cylindrical surface 112 and a first step surface 113. The axial diameter of the first outer cylindrical surface 111 is smaller than the axial diameter of the second outer cylindrical surface 112. The first step surface 113 is located between the first outer cylindrical surface 111 and the second outer cylindrical surface 112.

[0032] An overtravel groove 114 is provided at the junction of the first step surface 113 and the first outer cylindrical surface 111, and the bottom of the overtravel groove 114 forms a first guiding inclined surface 114a, a guiding arc surface 114b and a second guiding inclined surface 114c. The first guiding inclined surface 114a is located on the side where the first step surface 113 is located, and the second guiding inclined surface 114c is located on the side where the first outer cylindrical surface 111 is located. The first guiding inclined surface 114a and the second guiding inclined surface 114c are both inclined toward the side where the first outer cylindrical surface 111 is located, and the two sides of the guiding arc surface 114b are respectively connected to the first guiding inclined surface 114a and the second guiding inclined surface 114c.

[0033] The utility model provides an overtravel groove 114 with a guide bevel 114a and a guide arc surface 114b at the junction of the first step surface 113 and the first outer cylindrical surface 111, which can provide an accommodation space for the edges and corners of the grinding wheel during processing, thereby avoiding contact with the first step surface 113 to form a rounded corner, ensuring the accuracy of positioning of the split rotor after assembly, and ensuring the assembly accuracy; by providing a 90° tooth spline 12a, good mechanical engagement is provided, ensuring the connection strength between the swivel 20 and the shaft body 10, meeting the requirements of one-way press-fitting, and avoiding the risk of cracks during the press-fitting process.

[0034] In addition, the one-way locking characteristics of the 90° toothed spline 12a can ensure that the swivel 20 will not slide in the opposite direction when pressed onto the shaft body 10, meeting the requirements of one-way press-fitting, and can evenly distribute pressure to reduce local stress concentration, thereby reducing the possibility of cracks caused by improper press-fitting.

[0035] On the basis of the above embodiment, an involute spline 111a is provided on the first outer cylindrical surface 111, and the involute spline 111a is extended along the axial direction from the end of the long shaft segment 11 away from the overtravel groove 114 toward the end close to the overtravel groove 114; due to the characteristics of its involute shape, the involute spline 111a can achieve a constant transmission ratio when transmitting torque, thereby improving the efficiency and smoothness of torque transmission.

[0036] It should be noted that the 90° tooth profile spline 12a and the involute spline 111a are both processed by a fully automatic CNC spline gear rolling machine, which has higher precision and efficiency and lower energy consumption.

[0037] On the basis of the above embodiment, the major axis section 11 is further provided with a third outer cylindrical surface 115, an inclined guide surface 116 and a second step surface 117. The axial diameter of the third outer cylindrical surface 115 is larger than the axial diameter of the second outer cylindrical surface 112. The two ends of the inclined guide surface 116 are respectively connected to the second outer cylindrical surface 112 and the third outer cylindrical surface 115. The second step surface 117 is located at one end of the third outer cylindrical surface 115 facing the minor axis section 13, and the second step surface 117 is connected to the assembly section 12. The third outer cylindrical surface 115 provides a larger support area, which helps to improve the overall stability and rigidity of the rotor. The inclined guide surface 116 forms a transition connection between the second outer cylindrical surface 112 and the third outer cylindrical surface 115. The second step surface 117 is connected to the assembly section 12. After the swivel 20 is press-fitted, it is abutted against the end surface of the swivel 20, that is, a positioning surface for the press-fitting of the swivel 20 is formed.

[0038] It should be noted that the first outer cylindrical surface 111, the second outer cylindrical surface 112, the third outer cylindrical surface 115, the inclined guide surface 116, the first step surface 113 and the second step surface 117 on the long axis section 11 are all formed by one-time grinding on a forming grinder. Among them, since the first outer cylindrical surface 111 is provided with an involute spline 111a, the first step surface 113 at the junction with the second outer cylindrical surface 112 is too narrow. By providing an overtravel groove 114 with a guide arc surface 114b, the edges and corners of the grinding wheel can be effectively avoided to avoid wear, thereby ensuring the molding quality and the positioning accuracy of the assembly.

[0039] On the basis of the above embodiment, a first center hole 11a is provided at the end of the long axis segment 11 away from the assembly segment 12, the first center hole 11a is coaxially arranged with the long axis segment 11, and the cone angle of the first center hole 11a is 58°; a second center hole 13a is provided at the end of the short axis segment 13 away from the long axis segment 11, the second center hole 13a is coaxially arranged with the short axis segment 13, and the cone angle of the second center hole 13a is 58°.

[0040] It should be noted that the first center hole 11a and the second center hole 13a have a positioning function in the grinding process, and the various form and position errors of the shaft body 10 are related to the positioning accuracy of the center hole. The first center hole 11a and the second center hole 13a are processed before the rolling process of the involute spline 111a, and the rolling process causes the shape of the center hole to be slightly deformed. After the shaft body 10 is heat treated, a layer of oxide scale is formed on the conical surface of the first center hole 11a and the second center hole 13a. Before the grinding process of the shaft body 10, a 60° center grinding is required to remove the oxide scale on the conical surface of the first center hole 11a and the second center hole 13a to form at least 3 / 4 circle of bright ring, and it is necessary to ensure that the contact degree between the center and the conical surface is more than 80%; the conical surface of the center hole is designed to be 58°, which is conducive to the 60° grinding center and The contact with the conical surface of the center hole is more complete, and it is easier to form a complete bright ring zone, thereby ensuring that various form and position errors in subsequent processes are controlled within the tolerance range.

[0041] On the basis of the above embodiment, the depth of the first center hole 11 a is set greater than the depth of the second center hole 13 a to ensure the assembly and positioning of the shaft body 10 in the subsequent processing process.

[0042] On the basis of the above embodiment, the swivel 20 is provided with an axial hole 21, a plurality of blade grooves 22 and a back-cut groove 23 along the axial direction. The axial hole 21 is coaxially arranged with the swivel 20, and the aperture of the axial hole 21 is matched with the axial diameter of the assembly section 12. The blade groove 22 is rectangular, and a plurality of blade grooves 22 are symmetrically spaced around the center of the axial hole 21. The back-cut groove 23 extends from the inner side surface of the swivel 20 toward the corresponding blade groove 22 end and is connected, and the angles between adjacent blade grooves 22 are equal; thereby ensuring the precise fit between the swivel 20 and the shaft body 10, so that the swivel 20 The rotation center is consistent with the rotation center of the shaft body 10, which improves the balance, stability and durability of the rotor; the blade groove 22 is set to be rectangular, which is conducive to the sliding and retracting of the blade in the groove; the retreat groove 23 is designed to be arc-shaped, ensuring that there is enough avoidance space when the blade retreats. In addition, during the grinding process of the groove, an avoidance space is provided for the outer cylindrical cutting edge of the grinding wheel, which is conducive to maintaining the sharpness of the cutting edge, and ultimately ensuring that the size and shape and position errors of the groove are within the tolerance range. The evenly distributed setting helps to maintain the balance of the rotor movement and reduce the performance degradation caused by vibration caused by imbalance.

[0043] Based on the above embodiment, 5 groups of blade slots 22 and blade recesses 23 are correspondingly arranged; this helps to maintain the stability of the split rotor during the operation of the compressor, and provides more gas compression areas, which helps to improve the compression efficiency of the gas inside the split rotor.

[0044] It should be noted that the rotor 20 is formed by powder metallurgy pressing and sintering, and its material properties meet the force requirements of the parts. The density is lower than that of the iron rotor, and there is a certain weight reduction effect. Due to the guarantee of the precision mold, the grinding allowance is small, and the five groups of blade grooves 22 and the retreat grooves 23 are all formed by pressing to avoid additional processing.

[0045] On the basis of the above embodiment, the 90° tooth spline 12a is connected with the shaft hole 21 by interference fit, and the interference is 0.02-0.09mm; it is convenient for the shaft tooth to be embedded in the swivel 20, enhancing the bonding strength between the two, and reducing the resistance during press fitting and the stress after press fitting.

[0046] On the basis of the above embodiment, a protrusion is arranged on the inner side wall of one end of the shaft hole 21 to form a stepped assembly surface 21a, and the assembly surface 21a is connected with the short shaft section 13 by interference fit, and the interference amount is 0.015-0.065mm, which further ensures the strength of the connection.

[0047] It should be noted that before the rotor 20 is pressed onto the shaft, it is necessary to heat the rotor 20 to 180°C and then keep it warm for 30 minutes. After taking it out, place the rotor 20 at the end where the short shaft section 13 of the shaft body 10 is located. On a 10T hydraulic press, set the pressure to 5Mpa and press it into place at one time. After the press-fitting, the split rotor needs to be left naturally for 24 hours or kept warm at an ambient temperature of 180°C for 3 hours to eliminate stress before entering the subsequent grinding process.

[0048] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A split rotor of a rotary vane compressor, characterized in that: include: A shaft body and a swivel, wherein the shaft body comprises a long shaft section, an assembly section and a short shaft section arranged in sequence along the axial direction, the assembly section is provided with a 90° toothed spline along the axial direction, and the swivel is press-fitted to the assembly section through the 90° toothed spline; Wherein, the end of the long axis section away from the short axis section is provided with a first outer cylindrical surface, a second outer cylindrical surface and a first step surface, the axial diameter of the first outer cylindrical surface is smaller than the axial diameter of the second outer cylindrical surface, and the first step surface is located between the first outer cylindrical surface and the second outer cylindrical surface; An overrun groove is provided at the junction of the first step surface and the first outer cylindrical surface, and the bottom of the overrun groove forms a first guiding inclined surface, a guiding arc surface and a second guiding inclined surface, the first guiding inclined surface is located on the side where the first step surface is located, and the second guiding inclined surface is located on the side where the first outer cylindrical surface is located, and the first guiding inclined surface and the second guiding inclined surface are both inclined toward the side where the first outer cylindrical surface is located, and the two sides of the guiding arc surface are respectively connected to the first guiding inclined surface and the second guiding inclined surface.

2. The split rotor of the rotary vane compressor according to claim 1, characterized in that: An involute spline is arranged on the first outer circumferential surface, and the involute spline is extended along the axial direction from the end of the long axis section away from the overrun groove toward an end close to the overrun groove.

3. The split rotor of the rotary vane compressor according to claim 1, characterized in that: The long axis section is also provided with a third outer cylindrical surface, an inclined guide surface and a second step surface. The axial diameter of the third outer cylindrical surface is larger than the axial diameter of the second outer cylindrical surface. The two ends of the inclined guide surface are respectively connected to the second outer cylindrical surface and the third outer cylindrical surface. The second step surface is located at one end of the third outer cylindrical surface facing the short axis section, and the second step surface is connected to the assembly section.

4. The split rotor of the rotary vane compressor according to claim 1, characterized in that: A first center hole is arranged at the end of the long axis section away from the assembly section. The first center hole is coaxially arranged with the long axis section, and a cone angle of the first center hole is 58°.

5. The split rotor of the rotary vane compressor according to claim 4, characterized in that: A second center hole is arranged at the end of the short axis segment facing away from the long axis segment. The second center hole is coaxially arranged with the short axis segment, and a cone angle of the second center hole is 58°.

6. The split rotor of the rotary vane compressor according to claim 5, characterized in that: The depth of the first center hole is set greater than the depth of the second center hole.

7. The split rotor of the rotary vane compressor according to claim 1, characterized in that: The swivel is provided with an axial hole, multiple sets of blade grooves and a back-off groove along the axial direction. The axial hole is coaxially arranged with the swivel, and the aperture of the axial hole is matched with the axial diameter of the assembly section. The blade groove is rectangular, and multiple blade grooves are symmetrically spaced around the center of the axial hole. The back-off groove extends from the inner side surface of the swivel toward the corresponding blade groove end, and the angles between adjacent blade grooves are equal.

8. The split rotor of the rotary vane compressor according to claim 7, characterized in that: The blade grooves and the tool retreat grooves are correspondingly provided in 5 groups.

9. The split rotor of the rotary vane compressor according to claim 7, characterized in that: The 90° toothed spline is connected to the shaft hole by interference fit, and the interference amount is 0.02-0.09 mm.

10. The split rotor of the rotary vane compressor according to claim 7, characterized in that: The inner side wall at one end of the shaft hole is convexly arranged to form a stepped assembly surface, and the assembly surface is connected with the short shaft section by interference fit, and the interference amount is 0.015-0.065mm.

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