Pin connection type rotor structure and vacuum pump

Abstract

The embodiment of the utility model discloses a pin connection type rotor structure, and the structure comprises a rotating shaft, one end of the rotating shaft is provided with an abutting step, the outer surface of the rotating shaft is provided with at least one first installation groove, and the first installation grooves are distributed in the axial direction; a plurality of rotors, each of which includes a through hole through which the rotating shaft passes; at least one second mounting groove is formed in the inner wall of the through hole, and the first mounting groove and the second mounting groove are spliced into a mounting position; the pin is installed in the installation position and used for limiting relative rotation of the rotor and the rotating shaft. According to the invention, the mounting positions formed by the first mounting grooves and the second mounting grooves respectively arranged on the rotating shaft and the rotor are matched with the pin joint mounting mode of the pins, so that the rotor and the rotating shaft can be simply, conveniently and quickly mounted with the advantages of simple structure and low-cost part production and processing.

Description

Technical Field

[0001] This application relates to the field of mechanical parts assembly technology, and in particular to a pin-connected rotor structure and a vacuum pump. Background Technology

[0002] In the field of rotating machinery (such as vacuum pumps and compressors), a reliable connection between the rotor and the shaft is one of the core technologies to ensure the efficient operation of the equipment.

[0003] Traditional connection methods mainly include keyed connections, expansion sleeve connections, and shaft sleeve clamping, but these technologies all have significant limitations. For example, keyed connections transmit torque by embedding a flat key or spline between the shaft and rotor. Although the structure is simple, it requires extremely high precision in keyway machining, and after long-term use, the keyway is prone to wear, leading to loosening of the fit and requiring frequent maintenance (as in the patent with publication number CN105156421A). Expansion sleeve connections use the radial deformation of an elastic sleeve to clamp the shaft and rotor (as in the shaft sleeve notch tightening scheme in patent CN202322592596.6). Although it can accommodate certain tolerances, its structure is complex, assembly requires special tools, and it is difficult to restore the sleeve deformation after disassembly. Repeated installation can easily lead to a decrease in connection stability, and the processing cost is high. Shaft sleeve clamping achieves fixation through interference fit or threaded clamping. Although the connection strength is high, it is extremely sensitive to the dimensional tolerances of the shaft and hole, and the mating surfaces are easily damaged during disassembly, making it difficult to adapt to frequent maintenance scenarios. It is evident that existing rotary connection methods generally suffer from structural complexity and high cost, leading to inconvenience in maintenance. Therefore, there is an urgent need for a rotor connection solution that balances low cost, ease of assembly, and high stability. Utility Model Content

[0004] The main objective of this application is to provide a pin-connected rotor structure and a vacuum pump, which aims to solve the technical problems of complex assembly structure and high cost of existing rotor connection schemes.

[0005] To achieve the above objectives, this application proposes a pin-connected rotor structure, comprising:

[0006] A rotating shaft, one end of which is provided with an abutment step, and at least one first mounting groove is provided on the outer surface of the rotating shaft, the first mounting groove being distributed along the axial direction;

[0007] Multiple rotors, each rotor including a through hole for the shaft to pass through; at least one second mounting groove is provided on the inner wall of the through hole, and the first mounting groove and the second mounting groove are combined to form a mounting position;

[0008] A pin, which is installed in the mounting position, is used to limit the relative rotation of the rotor and the shaft.

[0009] For example, in the pin-connected rotor structure provided in at least one embodiment of this application, each second mounting slot is a non-through slot with a closed surface at one end.

[0010] For example, in the pin-connected rotor structure provided in at least one embodiment of this application, each rotor has a through hole with transition steps on at most two sides, the transition steps extending along the axial direction of the through hole and abutting against the adjacent rotor.

[0011] For example, in the pin-connected rotor structure provided in at least one embodiment of this application, at least one third mounting groove is provided on the inner wall of the transition step, and the first mounting groove and the third mounting groove are combined to form a mounting position for pin installation.

[0012] For example, in the pin-connected rotor structure provided in at least one embodiment of this application, the first mounting groove, the second mounting groove and the third mounting groove are semi-circular grooves, and the pin is a cylindrical pin.

[0013] For example, in the pin-connected rotor structure provided in at least one embodiment of this application, the first mounting groove, the second mounting groove and the third mounting groove are fan-shaped grooves, and the cross-section of the pin is D-shaped.

[0014] For example, in the pin-connected rotor structure provided in at least one embodiment of this application, the rotor is at least one of a Roots rotor, a claw rotor, or a multi-stage Roots rotor.

[0015] On the other hand, this application also provides a vacuum pump, including a pump body, wherein the pump body is provided with a pin-connected rotor structure as described in any one of the preceding claims.

[0016] Compared with the prior art, the pin-connected rotor structure of this application has at least the following beneficial effects:

[0017] The mounting position is formed by assembling the first and second mounting slots on the shaft and rotor, respectively. Pins are directly embedded to restrict relative rotation. Compared to traditional expansion sleeves or complex bushing structures, this design only requires one-time machining of the mounting slots via wire cutting or milling, significantly reducing the number of parts and machining steps, and lowering manufacturing costs. The design of assembling the rotor and pins layer by layer at the non-stepped end of the shaft eliminates the need for special tools or complex deformation operations. Positioning is achieved simply by inserting the pins layer by layer, and disassembly is achieved by reversing the operation. This avoids the risk of damage to the mating surfaces associated with traditional interference fits, improving assembly efficiency and maintenance convenience. The surface contact design between the pins and the assembled mounting position, compared to the line contact of keyed connections, disperses stress distribution, reduces fretting wear during long-term use, thereby maintaining connection stability and extending equipment life. Simultaneously, the mounting position, formed by the assembly of the mounting slots on the shaft and rotor, can leverage the versatility of standardized pins (such as cylindrical pins), reducing stringent requirements for shaft and hole machining accuracy. This allows the technical solution to flexibly adapt to different tolerance scenarios, enhancing system compatibility and practicality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a pin-connected rotor structure according to an embodiment of the present application;

[0020] Figure 2 for Figure 1 Cross-sectional view of an embodiment of a pin-connected rotor structure;

[0021] Figure 3 for Figure 1 Exploded view of an embodiment of a pin-connected rotor structure;

[0022] Figure 4 for Figure 3 Detailed view of rotors A and B in the pin-connected rotor structure;

[0023] Reference numerals: 10, rotating shaft; 11, abutment step; 12, first mounting groove; 20, rotor; 21, through hole; 22, second mounting groove; 23, transition step; 24, third mounting groove; 30, pin;

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] An embodiment of this application provides a pin-connected rotor structure, including a shaft, a rotor, and a pin: one end of the shaft is provided with an abutment step, and at least one first mounting groove is provided on the outer surface of the shaft, the first mounting grooves being distributed axially; the rotor includes a through hole for the shaft to pass through; at least one second mounting groove is provided on the inner wall of the through hole, the first mounting groove and the second mounting groove being joined together to form a mounting position; the pin is installed in the mounting position to limit the relative rotation between the rotor and the shaft.

[0030] See Figure 1 , Figure 2 The pin-connected rotor structure has a protrusion at one end of the rotating shaft 10 that surrounds the rotating shaft 10, i.e., abuts against the step 11. During the assembly process, the rotor 20 can abut against it, forming a restriction on the rotor 20 and preventing it from detaching from the rotating shaft 10.

[0031] Two grooves are symmetrically arranged on the circumferential surface of the rotating shaft 10, both distributed along the axial direction of the rotating shaft, forming the first mounting groove 12. The first mounting groove 12 is opened on the rotating shaft 10 in the form of a semi-circular groove. In addition to being able to form a shape that matches the outline of the pin 30 when it is assembled with the second mounting groove 22, it is also simple and convenient to process the rotating shaft 10 and the rotor 20, and is easy to mass-produce.

[0032] It should be noted that the main function of the abutment step in the rotor structure is to prevent the rotor from detaching from the shaft. During manufacturing, the groove can extend axially from the other end to the vicinity of the abutment step (i.e., Figure 2 , 3 (as shown in the diagram), or directly through the abutment step, forming a gap on the abutment step. This implementation method does not affect the realization of its function and also helps to reduce the processing difficulty.

[0033] Possibly, to enhance the fixing strength between the rotor 20 and the shaft 10 and improve the shear resistance of the rotor 20 structure during rotation, the first mounting groove 12 can be provided in more quantities, such as three, four, five, etc., but it is preferred that they are distributed on the shaft 10 in a symmetrical and uniform manner.

[0034] The rotor 20 has a through hole 21 at its shaft center. Two grooves, namely the second mounting groove 22, are correspondingly opened on the inner wall of the through hole 21. The second mounting groove 22 is also opened on the rotor 20 in the form of a semi-circular groove, which matches the corresponding first mounting groove 12 to form a complete cylindrical mounting position.

[0035] Similarly, the second mounting slot 22 can also be set according to the number of the first mounting slots 12 to achieve the assembly of more mounting positions.

[0036] The pin 30 is a cylindrical pin that can be inserted into the mounting position after the mounting position is assembled. When the rotor 20 is fitted onto the shaft 10, the engagement of the pin 30 with the mounting position can fix the rotor 20 and the shaft 10 and restrict their relative rotation.

[0037] In another embodiment, the first mounting groove 12 and the second mounting groove 22 can be made of grooves with a fan-shaped cross section, which, after being assembled, form a mounting position with a D-shaped cross section. Correspondingly, the pin 30 also adopts a pin with a D-shaped cross section. This irregularly shaped pin can enhance the torsional resistance and improve the durability and service life of the equipment when assembled in the actual operation of the rotor structure.

[0038] In the embodiments provided in this application, multiple different rotors 20 can be installed on the same rotating shaft 10. These rotors 20 can be one or more of Roots rotors, claw rotors, and multi-stage Roots rotors, and can be selected according to actual needs.

[0039] During assembly, each rotor 20 is sequentially inserted into the rotating shaft 10. After each rotor 20 is inserted, the first mounting groove 12 and the second mounting groove 22 are aligned to form a mounting position. Then, the pin 30 is inserted into the mounting position to fix the rotor 20 and the rotating shaft 10 in a relatively fixed manner in the rotation direction. The rotor structure is simple, and the assembly and disassembly are quick. Furthermore, the rotor 20, rotating shaft 10, and pin 30 can all be mass-produced in a standardized manner, which can effectively reduce assembly costs and improve efficiency.

[0040] Based on the pin-connected rotor structure of the previous embodiment, each second mounting slot 22 is a non-through slot with a closed surface at one end.

[0041] like Figure 4 As shown, the second mounting groove 22 opened on the inner wall of the through hole 21 of the rotor 20 is set in a non-through form, that is, it is partially opened on the inner wall of the through hole 21, so that one end of the second mounting groove 22 has a closed surface. This closed surface can serve as a limiting component for the assembly of the pin 30, preventing the pin 30 from coming out of the groove due to working vibration after assembly, thus causing the fixing relationship to fail. This is beneficial to the stability of the connection between the rotor 20 and the shaft 10.

[0042] In one embodiment of this application, each rotor 20 has a through hole 21 with transition steps 23 on at most two sides, the transition steps 23 extending along the axial direction of the through hole 21 and abutting against the adjacent rotor 20.

[0043] like Figure 3 , Figure 4 As shown, an annular transition step 23 is provided on the left and / or right sides of the through hole 21 of the rotor 20 along the axial direction. In actual operation, the rotor structure may require multiple rotors 20 to be installed on the same shaft 10 to work together. Adjacent rotors 20 not only need to maintain a distance, but also need to avoid changes in their relative working positions. By setting the transition step 23, adjacent rotors 20 abut against each other with the transition step 23, limiting sliding and displacement along the direction of the shaft 10, thereby ensuring the expected working position relationship. In addition, under the action of the transition step 23, one end of the installed pin 30 can also be restricted. For example, based on the previous embodiment, one end of the pin 30 is restricted by the closed surface of the non-through groove, and the other end is restricted by the transition step 23, thereby realizing the stable fixation of the pin 30 in the mounting position.

[0044] Furthermore, at least one third mounting groove 24 is provided on the inner wall of the transition step 23. The first mounting groove 12 and the third mounting groove 24 are combined to form a mounting position for the installation of the pin 30.

[0045] The assembly relationship between the third mounting slot 24 and the first mounting slot 12, as well as the assembly relationship of the pin 30, are the same as the corresponding relationship between the second mounting slot 22 and the first mounting slot 12 in the previous embodiment, and will not be repeated here.

[0046] It is understood that the second mounting groove 22 and the third mounting groove 24, which cooperate with the first mounting groove 12, can be implemented as a whole in some embodiments, that is, in the form that part of the groove is located on the transition step 23 and part of the groove is located on the inner wall of the through hole 21.

[0047] It should be noted that the transition steps on each rotor can be selected according to working needs or assembly relationship. For example, transition steps can be set on the left, right, left and right sides of the through holes of different rotors respectively, or they can be used directly without setting transition steps.

[0048] by Figure 3 Taking the disassembly direction (left side is the proximal end, right side is the distal end) as an example, the proximal F rotor only has a transition step on the right side of the through hole, and a third mounting groove is provided at the transition step. It can be understood that on this rotor, the third mounting groove can extend towards the through hole, forming a groove partly located on the transition step and partly located on the inner wall of the through hole, i.e., the second mounting groove and the third mounting groove are implemented as a whole; the proximal E rotor and the distal A rotor can be assembled on the shaft without a transition step, and are restricted and fixed by the transition steps on the adjacent rotors; for the distal B rotor, transition steps are provided on both sides of the through hole for connection and restriction; while the D rotor and C rotor only have a transition step on one side of the through hole. The transition step setting method and assembly relationship of each rotor in this application can be adapted as needed. The embodiments and drawings are only for demonstration and illustration, and are not limited thereto.

[0049] according to Figure 3 It can be understood that the rotor structure is installed layer by layer from the far end to the near end. On the side of each rotor near the far end, the assembly on the shaft is completed either through the third mounting groove on the transition step or through the second mounting groove on the through hole (the mounting position formed with the first mounting groove) and the use of pins. Regardless of whether the second or third mounting groove is used for assembly, it should be understood that the pins must be exposed after the rotor at the adjacent end is removed, so as to facilitate the removal of them with tools.

[0050] On the other hand, this application also provides an embodiment of a vacuum pump (not shown in the figures), which includes a pump body and a pin-connected rotor structure as in any of the previous embodiments. The pump body has two sets of mutually coupled and matched pin-connected rotor structures, and the rotors in different sets cooperate and work together.

[0051] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A pin-connected rotor structure, characterized in that, include: A rotating shaft, one end of which is provided with an abutment step, and at least one first mounting groove is provided on the outer surface of the rotating shaft, the first mounting groove being distributed along the axial direction; Multiple rotors, each rotor including a through hole for the shaft to pass through; at least one second mounting groove is provided on the inner wall of the through hole, and the first mounting groove and the second mounting groove are combined to form a mounting position; A pin, which is installed in the mounting position, is used to limit the relative rotation of the rotor and the shaft.

2. The pin-connected rotor structure according to claim 1, characterized in that, Each second mounting slot is a non-through slot with a closed surface at one end.

3. The pin-connected rotor structure according to claim 1, characterized in that, Each rotor has a through hole with transition steps on up to two sides, the transition steps extending axially along the through hole and abutting against the adjacent rotor.

4. The pin-connected rotor structure according to claim 3, characterized in that, At least one third mounting groove is provided on the inner wall of the transition step, and the first mounting groove and the third mounting groove are combined to form a mounting position for the installation of pins.

5. The pin-connected rotor structure according to claim 4, characterized in that, The first mounting groove, the second mounting groove, and the third mounting groove are semi-circular grooves, and the pin is a cylindrical pin.

6. The pin-connected rotor structure according to claim 4, characterized in that, The first mounting groove, the second mounting groove, and the third mounting groove are fan-shaped grooves, and the cross-section of the pin is D-shaped.

7. The pin-connected rotor structure according to claim 1, characterized in that, The rotor is at least one of a Roots rotor, a claw rotor, or a multi-stage Roots rotor.

8. A vacuum pump, characterized in that, It includes a pump body, wherein the pump body is provided with a pin-connected rotor structure as described in any one of claims 1-7.

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