Roots pump rotor assembly

Abstract

The rotor assembly of the roots pump comprises a rotating shaft and a multi-stage rotor, and the multi-stage rotor is connected to the rotating shaft in a sleeving mode; key grooves corresponding to the rotors are formed in the rotating shaft, and connecting keys are arranged in the key grooves; a mounting groove is formed in the rotor, the mounting groove penetrates through the rotor in the axial direction, and the mounting groove is matched with the key groove to mount the same connecting key. According to the invention, when the rotor and the rotating shaft are mounted, the rotor only needs to be sleeved on the rotating shaft and move along the axial direction, so that the mounting grooves correspondingly clamp the connecting keys, the circumferential positioning of the rotor and the rotating shaft can be realized, the connection between the rotor and the rotating shaft is tight, and the reliability of torque transmission is ensured; meanwhile, the rotor and the rotating shaft can be disassembled and assembled only by sliding along the axial direction, so that the assembling and disassembling procedures are greatly simplified, and the production cost and the maintenance cost are reduced; and each rotor is correspondingly provided with one connecting key, so that the connection interference between each rotor and the rotating shaft is reduced, and the service life of the rotor assembly is prolonged.

Description

Technical Field

[0001] This application relates to the field of vacuum pump technology, specifically to a Roots pump rotor assembly. Background Technology

[0002] A Roots pump generally consists of a pump body, rotor assembly, bearings, sealing device, transmission device, etc., among which the rotor assembly is one of the most important structural components of a vacuum pump.

[0003] Currently, in existing Roots pumps, the rotor assembly includes a shaft and a multi-stage rotor. The rotor and shaft are connected by an interference fit. Although the interference fit method is very reliable in transmitting torque, it is difficult to disassemble and assemble, resulting in reduced production efficiency and increased maintenance costs. Utility Model Content

[0004] In view of this, and in response to the technical problem that the rotor assembly in the prior art uses an interference fit connection between the shaft and the rotor, which makes the installation and disassembly process relatively complicated, this application provides a Roots pump rotor assembly in which the shaft and the rotor are connected by a key, and each rotor corresponds to a connection position, which can reduce the difficulty of installation and disassembly.

[0005] This application provides a Roots pump rotor assembly, including a shaft and a multi-stage rotor, wherein the multi-stage rotor is sleeved on the shaft;

[0006] The rotating shaft is provided with a keyway corresponding to each rotor, and a connecting key is provided in the keyway;

[0007] The rotor is provided with a mounting groove that extends through the rotor axially, and the mounting groove cooperates with the keyway to install the same connecting key.

[0008] Compared with the prior art, in the Roots pump rotor assembly of this application, the shaft and the multi-stage rotor are installed, positioned, and limited by a connecting key. The shaft has a keyway for mounting the connecting key, and the connecting key is located within the keyway. Correspondingly, the rotor has a mounting groove that extends axially through the rotor and corresponds to the keyway. This allows the rotor to be installed on the shaft simply by fitting it onto the shaft and moving it axially, causing the mounting groove to engage the connecting key. This achieves circumferential positioning of the rotor and shaft, ensuring a tight connection and reliable torque transmission. Furthermore, the rotor and shaft can be disassembled and installed simply by sliding axially, greatly simplifying the installation and disassembly process and reducing production and maintenance costs.

[0009] In addition, each rotor is equipped with a corresponding connection key, which makes the connection between each rotor and the shaft independent, ensuring installation flexibility. At the same time, the interference between the connection between each rotor and the shaft is reduced, which reduces the probability that the connection failure between one rotor and the shaft will affect the connection stability of other rotors and improve the service life of the rotor assembly.

[0010] Preferably, the keyway is recessed radially toward the axis of the rotating shaft, and the shape of the keyway corresponds to the shape of the connecting key, so as to limit the positioning of the connecting key;

[0011] The radial thickness of the connecting key is greater than the radial depth of the keyway.

[0012] Preferably, the mounting groove is recessed radially away from the pivot axis, and the sum of the radial depth of the mounting groove and the radial depth of the keyway is greater than or equal to the radial thickness of the connecting key.

[0013] Preferably, the rotor includes a rotor portion and a sleeve portion, the sleeve portion being coaxially arranged with the rotor portion, and the sleeve portion serving to separate the multi-stage rotors;

[0014] The mounting groove extends axially through both the rotor section and the sleeve section.

[0015] Preferably, the axial length of the keyway is less than the axial length of the rotor, wherein the two ends of the rotor extend beyond the two ends of the keyway.

[0016] Preferably, it further includes a first driving member and a second driving member, wherein the first driving member and the second driving member are respectively disposed at both ends of the multi-stage rotor.

[0017] Preferably, the multi-stage rotors are a first-stage rotor, a second-stage rotor, and a third-stage rotor, wherein the first-stage rotor, the second-stage rotor, and the third-stage rotor are arranged sequentially along the axial direction.

[0018] Preferably, the rotating shaft is provided with a first keyway, a second keyway and a third keyway, and the first keyway, the second keyway and the third keyway are spaced apart along the axial direction;

[0019] The axes of the first keyway, the second keyway, and the third keyway are on the same straight line.

[0020] Preferably, the first-stage rotor is provided with a first mounting groove, the second-stage rotor is provided with a second mounting groove, and the third-stage rotor is provided with a third mounting groove;

[0021] The first mounting slot corresponds to the first keyway, the second mounting slot corresponds to the second keyway, and the third mounting slot corresponds to the third keyway.

[0022] The rotor assembly of a Roots pump disclosed in this application has at least the following technical advantages:

[0023] 1. By setting an independent connecting key between each rotor and shaft for circumferential positioning, the connection stability and independence of each rotor and shaft are ensured, while the probability of the connection failure between some rotors and shaft affecting the connection stability of other rotors is reduced.

[0024] 2. By setting an axially through mounting groove on the rotor, the rotor can be displaced axially to achieve installation and disassembly with the shaft, simplifying the installation and disassembly process and reducing production and maintenance costs.

[0025] 3. By setting the sleeve part, the separation and axial positioning between rotors can be achieved, ensuring the connection stability between the shaft and the rotor. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of a Roots pump rotor assembly provided in an embodiment of this application;

[0027] Figure 2 This is a cross-sectional structural schematic diagram of a Roots pump rotor assembly provided in an embodiment of this application;

[0028] Figure 3 This is a three-dimensional structural schematic diagram of a rotating shaft provided in an embodiment of this application;

[0029] Figure 4 This is a three-dimensional structural schematic diagram of a rotor provided in an embodiment of this application;

[0030] Figure 5 yes Figure 2 A magnified view of part A.

[0031] Reference numerals: 1. Shaft; 2. Connecting key; 3. First-stage rotor; 4. Second-stage rotor; 5. Third-stage rotor; 6. First driving component; 7. Second driving component; 8. Keyway; 9. Mounting groove; 10. Rotor section; 11. Sleeve section. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0033] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0034] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0035] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 5 illustrate.

[0036] This application provides a Roots pump rotor assembly, such as Figures 1 to 2 As shown, the rotor assembly includes a shaft 1, a connecting key 2, a multi-stage rotor, a first driving component 6, and a second driving component 7. The first driving component 6, the multi-stage rotor, and the second driving component 7 are sequentially and axially spaced on the shaft 1. The multi-stage rotor and the shaft 1 are circumferentially positioned by the connecting key 2 to ensure the connection stability between the rotor and the shaft 1, thereby ensuring the reliability of torque transmission.

[0037] Specifically, such as Figures 1 to 2 As shown, the rotor assembly includes three rotors, which form three levels of rotors, namely primary rotor 3, secondary rotor 4 and tertiary rotor 5. The primary rotor 3, secondary rotor 4 and tertiary rotor 5 are arranged sequentially along the axial direction. The first driving member 6 is located on the side of the primary rotor 3 and the second driving member 7 is located on the side of the tertiary rotor 5.

[0038] In this application, as Figures 2 to 5 As shown, the rotating shaft 1 is provided with a keyway 8 corresponding to each rotor. The keyway 8 is recessed radially toward the axis of the rotating shaft 1. The shape of the keyway 8 corresponds to the shape of the connecting key 2, so that the keyway 8 can accommodate the connecting key 2 while also limiting the connecting key 2 to ensure that the connecting key 2 will not easily wobble relative to the keyway 8. The radial thickness of the connecting key 2 is greater than the radial depth of the keyway 8, so that the connecting key 2 can protrude radially from the outer surface of the rotating shaft 1, thereby positioning the rotor.

[0039] Correspondingly, such as Figure 3 , Figure 5As shown, the rotor is provided with a mounting groove 9, which penetrates the rotor axially and is recessed radially away from the rotating shaft 1. The sum of the radial depth of the mounting groove 9 and the radial depth of the keyway 8 is greater than or equal to the radial thickness of the connecting key 2, so that the mounting groove 9 and the keyway 8 cooperate to install the same connecting key 2, so that the connecting key 2 can act on both the rotating shaft 1 and the rotor at the same time, thereby achieving circumferential positioning of the rotor and the rotating shaft 1 to ensure the stability of torque transmission between the rotor and the rotating shaft 1.

[0040] Furthermore, since the mounting groove 9 passes through the rotor axially, when the rotor is installed with the shaft 1, it is only necessary to insert the rotor from one end of the shaft 1 onto the shaft 1 and move the rotor axially to the corresponding position so that the mounting groove 9 locks the connecting key 2, thereby achieving circumferential positioning of the rotor and the shaft 1. If it is necessary to remove the rotor from the shaft 1, the rotor is displaced axially, thereby achieving disassembly of the rotor from the shaft 1. In this embodiment, the rotor and shaft 1 can be disassembled and installed simply by sliding axially, which greatly simplifies the installation and disassembly procedures and reduces production and maintenance costs.

[0041] It should be noted that, as Figures 1 to 2 As shown, the number of keyways 8 on the rotating shaft 1 corresponds to the number of rotors, and the positions of the keyways 8 also correspond to the positions of the corresponding rotors. Each rotor has a corresponding mounting groove 9, and each keyway 8 contains a connecting key 2. In this application, the rotating shaft 1 has a first keyway 8, a second keyway 8, and a third keyway 8, which are spaced apart axially. The first-stage rotor 3 has a first mounting groove 9, which corresponds to the first keyway 8; the second-stage rotor 4 has a second mounting groove 9, which corresponds to the second keyway 8; and the third-stage rotor 5 has a third mounting groove 9, which corresponds to the third keyway 8. This allows each rotor to be connected to the rotating shaft 1 by a corresponding connecting key 2, ensuring that the connection between each rotor and the rotating shaft 1 is independent, guaranteeing installation flexibility. Simultaneously, the interference between the connection between each rotor and the rotating shaft 1 is reduced, decreasing the probability that a failure in the connection between one rotor and the rotating shaft 1 will affect the connection stability of other rotors, thus improving the service life of the rotor assembly.

[0042] Furthermore, in an optional embodiment of this application, such as Figure 2 , Figure 3 As shown, the axes of the first keyway 8, the second keyway 8, and the third keyway 8 are on the same straight line, which ensures that the installation of the three rotors is relatively convenient. The three connecting keys 2 can be placed on the rotating shaft 1 at the same time, thereby realizing the installation of the three rotors and improving the installation efficiency.

[0043] In another optional embodiment of this application, the axes of the first keyway 8, the second keyway 8, and the third keyway 8 are not on the same straight line, that is, the first keyway 8, the second keyway 8, and the third keyway 8 are staggered in the circumferential direction. This can improve the uniform force distribution of the rotating shaft 1 and increase the service life of the rotating shaft 1.

[0044] Based on any of the above embodiments, the rotor can be further extended; such as... Figure 4 , Figure 5 As shown, the rotor includes a rotor section 10 and a sleeve section 11. The sleeve section 11 is coaxially arranged with the rotor section 10 and is connected to the end of the rotor section 10. The rotor section 10 has a claw-shaped structure, and the sleeve section 11 has a cylindrical structure. The sleeve section 11 is located at the end of the current rotor that is close to another rotor, so that the sleeve section 11 can separate the multi-stage rotors and also play an axial positioning role between the multi-stage rotors, ensuring the stability between the multi-stage rotors.

[0045] In one embodiment, the mounting groove 9 extends axially through both the rotor portion 10 and the sleeve portion 11 to facilitate the installation of the rotor and the connecting key 2.

[0046] Based on any of the above embodiments, the keyway 8 can be further extended; such as... Figure 1 , Figure 5 As shown, the axial length of the keyway 8 is less than the axial length of the rotor. The two ends of the rotor extend beyond the two ends of the keyway 8, which allows the keyway 8 and the connecting key 2 to be hidden in the middle of the rotor. This prevents the connecting key 2 from protruding outward, ensuring that the connecting key 2 fully bears the force on the rotor while preventing the connecting key 2 from coming off between the rotor and the shaft 1. It also has a better aesthetic appearance and can prevent external components from interfering with the connecting key 2, further ensuring the connection stability between the rotor and the shaft 1.

[0047] It should be noted that the first drive component 6 is integrally formed with the rotating shaft 1, and the second drive component 7 is a five-bladed Roots rotor element. The second drive component 7 is connected to the rotating shaft 1 by a pin.

[0048] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0049] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A rotor assembly for a Roots pump, characterized in that, It includes a rotating shaft (1) and a multi-stage rotor, with the multi-stage rotor sleeved on the rotating shaft (1); The rotating shaft (1) is provided with a keyway (8) corresponding to each rotor, and a connecting key (2) is provided in the keyway (8); The rotor is provided with a mounting groove (9), which extends through the rotor axially. The mounting groove (9) cooperates with the keyway (8) to install the same connecting key (2).

2. The Roots pump rotor assembly according to claim 1, characterized in that, The keyway (8) is recessed radially toward the axis of the rotating shaft (1), and the shape of the keyway (8) corresponds to the shape of the connecting key (2) to limit the connection key (2); The radial thickness of the connecting key (2) is greater than the radial depth of the keyway (8).

3. The Roots pump rotor assembly according to claim 2, characterized in that, The mounting groove (9) is recessed radially away from the rotating shaft (1), and the sum of the radial depth of the mounting groove (9) and the radial depth of the keyway (8) is greater than or equal to the radial thickness of the connecting key (2).

4. The Roots pump rotor assembly according to claim 1, characterized in that, The rotor includes a rotor section (10) and a sleeve section (11). The sleeve section (11) is coaxially arranged with the rotor section (10). The sleeve section (11) is used to separate the multi-stage rotors. The mounting groove (9) passes through both the rotor portion (10) and the sleeve portion (11) axially.

5. The Roots pump rotor assembly according to claim 1, characterized in that, The axial length of the keyway (8) is less than the axial length of the rotor, wherein the two ends of the rotor extend beyond the two ends of the keyway (8).

6. The Roots pump rotor assembly according to claim 1, characterized in that, It also includes a first driving element (6) and a second driving element (7), which are respectively disposed at both ends of the multi-stage rotor.

7. The Roots pump rotor assembly according to claim 1, characterized in that, The multi-stage rotors are a first-stage rotor (3), a second-stage rotor (4), and a third-stage rotor (5), wherein the first-stage rotor (3), the second-stage rotor (4), and the third-stage rotor (5) are arranged sequentially along the axial direction.

8. The Roots pump rotor assembly according to claim 7, characterized in that, The rotating shaft (1) is provided with a first keyway (8), a second keyway (8) and a third keyway (8), and the first keyway (8), the second keyway (8) and the third keyway (8) are spaced apart along the axial direction; The axes of the first keyway (8), the second keyway (8), and the third keyway (8) are on the same straight line.

9. The Roots pump rotor assembly according to claim 8, characterized in that, The first-stage rotor (3) is provided with a first mounting groove (9), the second-stage rotor (4) is provided with a second mounting groove (9), and the third-stage rotor (5) is provided with a third mounting groove (9). The first mounting slot (9) corresponds to the first keyway (8), the second mounting slot (9) corresponds to the second keyway (8), and the third mounting slot (9) corresponds to the third keyway (8).

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