Transmission assembly and adjustment device

Abstract

The application provides a transmission assembly and an adjusting device. The transmission assembly comprises a support, a shaft, a friction piece, a transmission wheel and an adjusting piece. The shaft is rotatably arranged in the support. The friction piece is slidably arranged on one end of the shaft along the axial direction of the shaft and is abuttingly arranged on the shaft along the circumference of the shaft. The transmission wheel is connected with the shaft and is configured to drive the shaft to rotate under the action of a force. The adjusting piece is movably arranged on the shaft and is connected with the friction piece. The adjusting piece is configured to drive the friction piece to slide back and forth along the axial direction under the action of a force, so that the friction piece selectively contacts the shaft end surface of the screw rotor. The transmission assembly is arranged, so that the transmission assembly can be connected with the screw rotor in transmission or the transmission connection between the transmission assembly and the screw rotor can be released according to the requirement. The transmission assembly has a simple structure and is convenient to operate. The time consumed for the circumferential adjustment of the screw rotor can be reduced, so that the adjustment efficiency of the screw rotor can be improved and the assembly efficiency of the vacuum pump can be improved.

Description

Technical Field

[0001] This application relates to the field of vacuum equipment technology, and in particular to a transmission component and adjustment device. Background Technology

[0002] Vacuum equipment comes in various types, which can be categorized into rough vacuum equipment, medium vacuum equipment, and high vacuum equipment based on their vacuum level range. Medium vacuum equipment is primarily used to achieve a vacuum level of 10... 2 ~10 -1 Equipment requiring high pressure (P) such as twin-screw vacuum pumps. Twin-screw vacuum pumps are a type of oil-free dry vacuum pump that operates without the need for a working fluid (such as oil or water) for sealing, allowing direct gas extraction and avoiding contamination of the pumped medium. The core component of a twin-screw vacuum pump is a pair of screw rotors coupled together within the pump chamber.

[0003] In related technologies, the screw rotor is provided with helical grooves, and along the axis of the screw rotor, the width of the helical grooves gradually decreases from the air inlet to the exhaust outlet. When the two screw rotors rotate synchronously in opposite directions, the gas to be pumped enters the pump chamber from the air inlet under the action of pressure difference, and moves towards the exhaust outlet as the screw rotors rotate. As the width of the helical grooves gradually decreases with distance from the air inlet, the volume corresponding to each pitch of the helical groove gradually decreases, thereby gradually compressing the gas. Finally, the compressed gas is discharged from the pump chamber through the exhaust outlet.

[0004] During assembly, the adjustment and installation of the coupling position between the two screw rotors of a screw vacuum pump is a core factor affecting its stable and efficient operation. However, current devices for adjusting the screw rotor coupling position are cumbersome to operate, resulting in low assembly efficiency for screw vacuum pumps. Utility Model Content

[0005] This application provides a transmission component and an adjustment device to at least solve the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a transmission assembly is provided, comprising a bracket, a shaft, a friction element, a transmission wheel, and an adjusting element; the shaft is rotatably disposed on the bracket; the friction element is located at one end of the shaft, and the friction element slides along the axial direction of the shaft and is in a stop-fitting relationship with the shaft at one end, and along the circumference of the shaft; the transmission wheel is connected to the shaft and configured to drive the shaft to rotate under the action of a force; the adjusting element is movably disposed on the shaft and connected to the friction element, and the adjusting element is configured to drive the friction element to slide back and forth along the axial direction under the action of a force, so that the friction element selectively contacts the shaft end face of the screw rotor. Optionally, the adjusting member includes a moving rod and an adjusting part; the moving rod passes through the shaft and one end of the moving rod is connected to the friction member; the adjusting part is connected to the shaft and the other end of the moving rod, and the adjusting part is configured to drive the moving rod to move back and forth under the action of force so that the friction member slides back and forth along the axial direction.

[0007] Optionally, the two ends of the moving rod are movably connected to the friction element and the adjusting part, respectively; a first groove is provided at the end of the shaft away from the friction element, the bottom of the first groove is an arc-shaped concave surface, and part of the adjusting part is disposed in the first groove and contacts the bottom of the first groove; wherein, the adjusting part is configured to abut against the inner wall of the first groove and rotate around the center of the bottom of the first groove to drive the moving rod to move back and forth.

[0008] Optionally, the adjusting member also includes a spring, which is sleeved on the moving rod and compressed between the friction member and the shaft in the axial direction of the shaft.

[0009] Optionally, a mounting hole and a first through hole are sequentially connected in the shaft. A portion of the friction element is disposed in the mounting hole, a spring is disposed on the side of the friction element near the first through hole, and a moving rod passes through the first through hole. One end of the moving rod extends into the mounting hole to be movably connected with the friction element, and the other end extends into the first groove to be connected with the adjustment part.

[0010] Optionally, a mounting groove is provided at the end of the friction member away from the adjustment part, and a second through hole is provided at the bottom of the mounting groove. The adjustment member also includes a first seat and a first block. The first seat is disposed in the mounting groove. The first block is located at the end of the first seat away from the adjustment part, and the first block is rotatably engaged with the first seat along the radial direction of the shaft. The end of the moving rod away from the adjustment part passes through the second through hole and the first seat and is connected to the first block.

[0011] Optionally, the moving rod is threadedly connected to the first piece; And / or, the first seat is provided with a second groove at the end away from the adjustment part, the first block is a cylindrical structure, at least a part of the first block is disposed in the second groove and fits against the inner wall of the second groove.

[0012] Optionally, the adjusting member also includes a second block, which is rotatably connected to the adjusting part, and the end of the moving rod away from the friction member is connected to the second block.

[0013] Optionally, the moving rod is connected to the second threaded block; And / or, there are two adjustment parts, which are located at both ends of the second block and are rotatably connected to the second block.

[0014] Optionally, the shaft includes a first section and a second section. The first section is rotatably mounted on the bracket. The end of the first section away from the bracket slides axially with the friction element and stops with the friction element along the circumference of the shaft. A portion of the end face of the first section away from the friction element is connected to the second section, and another portion defines a mounting annular groove between the first section and the end face of the second section. The inner circumferential side of the transmission wheel is disposed in the mounting annular groove and is connected to the first section and / or the second section.

[0015] According to a second aspect of this application, an adjustment device is provided, which includes the aforementioned transmission component.

[0016] Optionally, two transmission components are provided, with the shafts of the two transmission components arranged side by side, and the transmission wheels of the two transmission components being gears that mesh with each other.

[0017] In the transmission assembly of this application embodiment, by setting the transmission assembly, the transmission assembly can be connected to or disconnected from the screw rotor as needed. Moreover, the transmission assembly has a relatively simple structure and is easy to operate, which can reduce the time spent on circumferential adjustment of the screw rotor, thereby improving the adjustment efficiency of the screw rotor and facilitating the improvement of the assembly efficiency of the vacuum pump.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a schematic diagram of the structure of the transmission assembly provided in an exemplary embodiment of this application; Figure 2 It is along Figure 1 Sectional view of AA; Figure 3 The adjustment element provided in the exemplary embodiments of this application is in Figure 2 A schematic diagram of the structure after adjusting the position of the friction component based on the diagram shown; Figure 4 This is a schematic diagram of the friction element and screw rotor transmission cooperation provided in an exemplary embodiment of this application; Figure 5This is a schematic diagram of the contact fit between the friction element and the screw rotor provided in the exemplary embodiment of this application; Figure 6 This is a structural block diagram of the adjustment device provided in an exemplary embodiment of this application; Figure 7 This is a partial schematic diagram of the adjustment device provided in an exemplary embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 20 - Transmission components; 21-Staff; 22-Shaft; 221-First groove; 222-Mounting hole; 223-First through hole; 224-First section; 225-Second section; 226-Connecting screw; 227-Connecting section; 228-Connecting threaded hole; 23-Friction component; 231-Mounting groove; 232-Second perforation; 24-Drive wheel; 25-Adjusting component; 251-Moving rod; 252-Adjusting part; 253-Spring; 254-First seat; 2541-Second groove; 255-First piece; 256-Second piece; 257-Handle; 26 - Rotary bearing; 30 - Screw rotor; 100 - Adjustment device. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] Before introducing the transmission component and adjustment device provided in the embodiments of this application, the relevant technologies of this application will be introduced first.

[0024] In related technologies, in order to ensure good rotation of the screw rotor when the screw vacuum pump is working, it is necessary to adjust the axial positioning of each screw rotor (i.e., the axial installation position of the screw rotor), the axial end face positioning of each screw rotor, the radial positioning between two mating screw rotors (i.e., the distance between the two screw rotors), and the circumferential positioning between two mating screw rotors (i.e., the circumferential angle of the helical surfaces of the two screw rotors) so that the mutual coupling relationship between the two screw rotors reaches an ideal matching state, so that the two screw rotors can operate stably.

[0025] During adjustment, the axial positioning, axial end face positioning, and radial positioning between the two screw rotors can be quickly determined by the mating position between the tooling supporting the screw rotor and the screw rotor. However, for circumferential positioning, it is necessary to first determine the preliminary mating position based on the mutual coupling relationship of the two screw rotors. Then, the two screw rotors are locked relative to the tooling, and the motor is connected to the screw rotors via a transmission assembly. Next, the lock between the screw rotors and the tooling is released, allowing the motor to drive the two screw rotors to rotate relative to the tooling, simulating the rotation of the two coupled screw rotors under the working state of a screw pump. Based on the coupling under the simulated working state, it can be determined whether the circumferential angle between the two screw rotors needs adjustment. If adjustment is required, the motor is turned off, the transmission connection between the motor and the screw rotors is disconnected, and one of the screw rotors is rotated around its axis to adjust the circumferential angle of the mutual mating of the helical surfaces between the two screw rotors, thereby improving the coupling gap deviation between the two rotors and correcting accumulated machining and assembly errors. Then repeat the above steps until the coupling relationship between the two screws in the simulated working state reaches an ideal fit, and the two screw rotors operate well without jamming or wear.

[0026] In related technologies, the transmission components that connect or disconnect the motor and screw rotor as needed are complex in structure and cumbersome to operate. This results in a long time required for circumferential adjustment between the two screw rotors, leading to low assembly efficiency of the screw vacuum pump.

[0027] Based on this, embodiments of this application provide a transmission component and adjustment device that can quickly connect or disconnect the transmission between the motor and the screw rotor, thereby reducing the time spent on circumferential adjustment of the screw rotor and improving the adjustment efficiency of the screw rotor, which is beneficial to improving the assembly efficiency of the vacuum pump.

[0028] The following combination Figures 1 to 7 The transmission component 20 and the adjustment device 100 provided in the embodiments of this application will be described in detail.

[0029] Please see Figures 1 to 3In a first aspect, embodiments of this application provide a transmission assembly 20. The transmission assembly 20 includes a bracket 21, a shaft 22, a friction element 23, a transmission wheel 24, and an adjusting member 25. The shaft 22 is rotatably mounted on the bracket 21. The friction element 23 is located at one end of the shaft 22. The friction element 23 slides along the axial direction of the shaft 22 with one end of the shaft 22 and stops along the circumference of the shaft 22. The transmission wheel 24 is connected to the shaft 22 and configured to drive the shaft 22 to rotate under the action of a force. The adjusting member 25 is movably disposed on the shaft 22 and connected to the friction element 23. The adjusting member 25 is configured to drive the friction element 23 to slide back and forth along the axial direction under the action of a force, so that the friction element 23 selectively contacts the shaft end face of the screw rotor 30, such as... Figure 2 and Figure 3 As shown. For example, the shaft 22 can be rotatably mounted on the support frame via a bearing or via a bushing.

[0030] For example, the transmission wheel 24 is annular and sleeved on the shaft 22. Specifically, keyways are provided on the inner circumferential surface of the transmission wheel 24 and the outer circumferential surface of the shaft 22. Part of the key is located in the keyway of the transmission wheel 24, and the other part is located in the keyway of the shaft 22, thereby fixing the transmission wheel 24 and the shaft 22 together, so as to facilitate the transmission wheel 24 to drive the shaft 22 to rotate smoothly.

[0031] It is understandable that the friction element 23 and the shaft element 22 are inserted axially to facilitate the sliding fit between the friction element 23 and one end of the shaft element 22 axially.

[0032] It is understood that in this embodiment, the stop fit refers to a fit structure that restricts the relative rotation of the friction member 23 and the shaft member 22 on the circumference. Specifically, the cross-section (the section cut by a plane perpendicular to the axial direction) of the insertion fit between the friction member 23 and the shaft member 22 is non-circular, so as to achieve a stop fit between the friction member 23 and the shaft member 22 along the circumference, that is, the friction member 23 slides relative to the shaft member 22 but does not rotate. For example, the friction member 23 and the shaft member 22 are fitted by a flat rectangular shaft and a flat rectangular hole.

[0033] It is understandable that the force driving the transmission wheel 24 to rotate, thereby causing the shaft 22 to rotate, can originate from a rotary motor. The output shaft of the rotary motor meshes with the transmission wheel 24 through an output gear to transmit rotational power to the shaft 22, which in turn drives the friction element 23 to rotate. The transmission wheel 24 can be a gear, a pulley, a sprocket, or something similar.

[0034] For example, the adjusting member 25 can be a screw, for instance, the screw is connected to the shaft 22, and the end of the screw shank can selectively abut against the outer peripheral surface of the friction member 23, thereby fixing the friction member 23 relative to the shaft 22 by tightening the screw, and allowing the friction member 23 to move relative to the shaft 22 by loosening the screw.

[0035] As another example, the adjusting member 25 can also be a telescopic rod, such as a pneumatic rod. In this way, the position of the friction member 23 relative to the shaft member 22 can be adjusted by adjusting the length of the telescopic rod, so as to drive the friction member 23 to slide back and forth axially.

[0036] As another example, the adjusting member 25 can also be a worm gear turbine, with the worm arranged axially and one end of the worm connected to the friction member 23, the worm meshing with the turbine. Rotating the turbine drives the worm to move, thereby driving the friction member 23 to slide back and forth axially.

[0037] The transmission assembly 20 can be applied to various working conditions. The embodiments of this application are mainly illustrated by the application of the transmission assembly 20 to adjust the circumferential fit between a pair of rotors of a screw vacuum pump.

[0038] For example, when adjusting the circumferential fit of the two screw rotors 30 of the screw vacuum pump, one of the two screw rotors 30 engages with the friction element 23 of the transmission assembly 20, while the other screw rotor 30 engages with the screw rotor 30 engaged with the transmission assembly 20 via a gear set, thereby achieving synchronous reverse rotation. Alternatively, two transmission assemblies 20 can be configured, with the friction elements 23 of each of the two transmission assemblies 20 engaging with their respective components.

[0039] Specifically, a pair of mating screw rotors 30 are placed in a fixture, and the transmission assembly 20 is positioned on one side of the fixture, with the axis of the shaft 22 coaxial with the axis of one screw rotor 30. When it is necessary to simulate the rotation of two coupled screw rotors 30 in the working state of a screw pump, the position of the friction element 23 is adjusted by the adjusting element 25, causing the friction element 23 to move towards the end of the screw rotor 30 until the friction element 23 abuts against the end of the screw rotor 30. Alternatively, the friction element 23 can directly abut against the end of the screw rotor 30, or a friction cylinder can be fixed to the shaft end of the screw rotor 30, with the friction element 23 abutting against the friction cylinder. This transmits the rotational power from the transmission wheel 24 sequentially through the shaft 22, the friction element 23, and the friction cylinder to the screw rotor 30, driving the screw rotor 30 to rotate and simulating the movement in the working state of a screw pump. Figure 4 As shown. When the motion of the screw rotor 30 under simulated working conditions determines that rotation of the screw rotor 30 is required, the motor is turned off, and the adjusting component 25 is adjusted so that the friction component 23 is moved away from the end of the screw rotor 30, thereby disengaging the transmission between the transmission assembly 20 and the screw rotor 30, as shown. Figure 5 As shown. Then rotate one screw rotor 30 to adjust the circumferential angle of the helical surfaces between the two screw rotors 30. Then repeat the above steps until the coupling relationship between the two screws in the simulated working state reaches an ideal fit, and the two screw rotors 30 operate well without jamming, wear, or other problems.

[0040] In this embodiment, by setting the transmission component 20, the transmission component 20 can be connected to or disconnected from the screw rotor 30 as needed. The transmission component 20 has a simple structure and is easy to operate, which can reduce the time spent on circumferential adjustment of the screw rotor 30, thereby improving the adjustment efficiency of the screw rotor 30 and improving the assembly efficiency of the vacuum pump.

[0041] Please see Figure 2 In some embodiments, the adjusting member 25 includes a moving rod 251 and an adjusting part 252. The moving rod 251 passes through the shaft 22. One end of the moving rod 251 is connected to the friction member 23. The adjusting part 252 is connected to the shaft 22 and the other end of the moving rod 251. The adjusting part 252 is configured to drive the moving rod 251 to move back and forth under the action of force, so that the friction member 23 slides back and forth axially. In this way, the adjusting part 252 is set away from the friction member 23, thereby reducing the difficulty of arranging the adjusting part 252 and the friction member 23 and the difficulty of operating the adjusting part 252, thereby improving the adjustment efficiency of the screw rotor 30 and improving the assembly efficiency of the vacuum pump.

[0042] For example, the adjusting part 252 can be a sleeve, one end of which is rotatably fitted onto the end of the shaft 22 away from the friction member 23. A threaded hole is provided at the bottom of the sleeve, and the end of the moving rod 251 away from the friction member 23 is threadedly connected to the threaded hole. In this way, rotating the sleeve relative to the shaft 22 can drive the moving rod 251 to move relative to the sleeve through the threaded engagement between the sleeve and the moving rod 251, thereby enabling the adjusting part 252 to be configured to drive the moving rod 251 to move back and forth under the action of force, so that the friction member 23 slides back and forth axially.

[0043] As another example, the adjustment part 252 can also be a drive disk, with meshing teeth arranged around its circumference, and the moving rod 251 is provided with a rack that meshes with the meshing teeth. The drive disk rotates radially around the shaft 22 to drive the rack to drive the moving rod 251 to move back and forth, thereby enabling the adjustment part 252 to be configured to drive the moving rod 251 to move back and forth under the action of force, so that the friction member 23 slides back and forth along the axial direction.

[0044] As another example, the adjusting part 252 can also be a magnet, connected to the moving rod 251, and magnetically attracted to the shaft 22. Thus, by moving the adjusting part 252 to the desired position, the adjusting part 252 is configured to drive the moving rod 251 to move back and forth under the action of force, causing the friction member 23 to slide back and forth axially.

[0045] Please see Figure 2 In some embodiments, the two ends of the moving rod 251 are movably connected to the friction member 23 and the adjusting part 252, respectively. A first groove 221 is provided at the end of the shaft 22 away from the friction member 23. The bottom of the first groove 221 is an arc-shaped concave surface. Part of the adjusting part 252 is disposed in the first groove 221 and contacts the bottom of the first groove 221. The adjusting part 252 is configured to abut against the inner wall of the first groove 221 and rotate around the center of the bottom of the first groove 221 to drive the moving rod 251 to move back and forth. In this way, by rotating the adjusting part 252, the transmission connection between the motor and the screw rotor 30 can be quickly established or disengaged, thereby reducing the time spent on circumferential adjustment of the screw rotor 30, thus improving the adjustment efficiency of the screw rotor 30 and improving the assembly efficiency of the vacuum pump.

[0046] Specifically, such as Figure 2 As shown, Figure 2 The image shows the state where the friction element 23 moves toward and contacts the screw rotor 30. At this time, the center of the connection between the moving rod 251 and the adjusting part 252 is... Figure 2 Point A is located at position A, which lies on a circle of radius R. Figure 2 In the state shown, rotating the adjusting part 252 counterclockwise results in the following: Figure 3 The diagram shows the friction element 23 away from the screw rotor 30. Figure 3 In this process, the center of the connection between the moving rod 251 and the adjusting part 252 moves from point A to point B along a circle with radius R. At this time, the moving rod 251 moves to the right along the axial direction, thereby driving the friction element 23 to move to the right.

[0047] For example, the arc-shaped concave surface can be a spherical surface, and correspondingly, the part where the adjusting part 252 mates with the bottom of the first groove 221 is a spherical surface.

[0048] As another example, the arc-shaped concave surface can also be a cylindrical surface. Correspondingly, the part where the adjusting part 252 mates with the bottom of the first groove 221 is a cylindrical surface, such as... Figure 1 As shown.

[0049] The adjusting part 252 can be interference-fitted with the first groove 221, which can improve the stability of the adjusting part 252 in the first groove 221; the adjusting part 252 can also be magnetically attracted to the shaft 22 to improve the stability of the adjusting part 252 in the first groove 221.

[0050] Please see Figure 2 In some embodiments, the adjusting member 25 further includes a spring 253. The spring 253 is sleeved on the moving rod 251 and compressed between the friction member 23 and the shaft 22 in the axial direction of the shaft 22. In this way, by keeping the spring 253 in a compressed state, the spring 253 presses against the friction member 23 through deformation restoring force, thereby maintaining stable contact between the friction member 23 and the screw rotor 30 when it is in transmission engagement with the screw rotor 30 through the transmission assembly 20, thereby improving transmission reliability.

[0051] Furthermore, by providing a spring 253 in a compressed state, the deformation restoring force of the spring 253 can increase the pressure of the adjusting part 252 acting on the inner wall of the first groove 221, thereby increasing the friction between the adjusting part 252 and the first groove 221, and thus improving the stability of the adjusting part 252 located in the first groove 221.

[0052] Please see Figure 2 In some embodiments, a mounting hole 222 and a first through hole 223 are sequentially connected within the shaft 22. A portion of the friction element 23 is disposed within the mounting hole 222. A spring 253 is disposed on the side of the friction element 23 near the first through hole 223, and a moving rod 251 passes through the first through hole 223. One end of the moving rod 251 extends into the mounting hole 222 to be movably connected to the friction element 23, and the other end extends into the first groove 221 to be connected to the adjusting part 252. This allows the transmission assembly 20 to have a compact structure, and the deformation of the spring 253 can be guided by the wall of the mounting hole 222, thereby improving the reliability of the transmission assembly 20.

[0053] Please see Figure 2 In some embodiments, a mounting groove 231 is provided at the end of the friction member 23 away from the adjusting part 252. A second through hole 232 is provided at the bottom of the mounting groove 231. The adjusting member 25 also includes a first seat 254 and a first block 255. The first seat 254 is disposed in the mounting groove 231. The first block 255 is located at the end of the first seat 254 away from the adjusting part 252, and the first block 255 is rotatably engaged with the first seat 254 along the radial direction of the shaft member 22. The end of the moving rod 251 away from the adjusting part 252 passes through the second through hole 232, the first seat 254, and is connected to the first block 255. In this way, the movable rod 251 and the friction member 23 can be movably connected, and the connection structure between the moving rod 251 and the friction member 23 is simple and easy to assemble.

[0054] Among them, the first seat 254 is fixed relative to the friction element 23.

[0055] For example, the first block 255 and the first seat 254 can be spherically engaged to achieve a rotatable engagement between the first block 255 and the first seat 254 along the radial direction of the shaft 22.

[0056] As another example, the first block 255 and the first seat 254 can be mated by their cylindrical surfaces to achieve a rotatable engagement between the first block 255 and the first seat 254 along the radial direction of the shaft 22.

[0057] In some embodiments, the movable rod 251 is threadedly connected to the first block 255. This improves the operability and maintainability of the transmission assembly 20.

[0058] Please see Figure 2 In some embodiments, a second groove 2541 is provided at the end of the first seat 254 away from the adjusting part 252. The first block 255 has a cylindrical structure. At least a portion of the first block 255 is disposed within the second groove 2541 and fits against the inner wall of the second groove 2541. This results in a larger mating area between the first seat 254 and the first block 255, which helps to improve the reliability of the rotational engagement between the first seat 254 and the first block 255.

[0059] It is understandable that the inner wall of the second groove 2541 is an arc surface, and its diameter is the same as that of the first piece 255.

[0060] It can be understood that the axis of the cylindrical structure is perpendicular to the axis of the shaft 22.

[0061] Please see Figure 2 In some embodiments, the adjusting member 25 further includes a second block 256, which is rotatably connected to the adjusting part 252. The end of the moving rod 251 away from the friction member 23 is connected to the second block 256. In this way, the movable connection between the moving rod 251 and the adjusting part 252 can be realized, and the connection structure between the moving rod 251 and the adjusting part 252 is simple and easy to assemble.

[0062] It can be understood that the rotatable connection between the second block 256 and the adjusting part 252 allows the second block 256 to rotate relative to the adjusting part 252 in a direction parallel to the radial direction of the shaft 22; that is, the second block 256 can rotate around... Figure 2 Midpoint A rotates relative to adjustment part 252.

[0063] Specifically, the axis of rotation of the second block 256 relative to the adjusting part 252 is perpendicular to the axis of the shaft 22 and parallel to the axis of the cylindrical structure.

[0064] In some embodiments, the movable rod 251 is threadedly connected to the second block 256. This improves the operability and maintainability of the transmission assembly 20.

[0065] Please see Figure 1 In some embodiments, two adjustment parts 252 are provided, with each adjustment part 252 located at one end of the second block 256 and rotatably connected to the second block 256. This improves the reliability of the connection between the moving rod 251 and the adjustment part 252.

[0066] For example, the two adjustment parts 252 are arranged symmetrically along the axis of the moving rod 251.

[0067] Please see Figures 1 to 3 In some embodiments, the adjusting member 25 further includes a handle 257. One end of the handle 257 is connected to the adjusting part 252. Thus, the adjusting part 252 can be rotated by the handle 257 to increase the lever arm applied to the adjusting part 252, thereby improving the ease of operation of rotating the adjusting part 252.

[0068] Please see Figure 2 In some embodiments, the shaft 22 includes a first segment 224 and a second segment 225. The first segment 224 is rotatably mounted on the bracket 21. One end of the first segment 224, away from the bracket 21, slides axially with the friction member 23 and stops with the friction member 23 along the circumference of the shaft 22. A portion of the end face of the first segment 224 away from the friction member 23 is connected to the second segment 225, and another portion defines a mounting annular groove between the first segment 224 and the end face of the second segment 225. The inner circumferential side of the drive wheel 24 is disposed within the mounting annular groove and is connected to the first segment 224 and / or the second segment 225. In this way, the shaft 22 is a discrete component to form the mounting annular groove for mounting the drive wheel 24, thereby improving the reliability of the connection between the drive wheel 24 and the shaft 22 while facilitating assembly, thus improving the reliability of the transmission between the drive wheel 24 and the shaft 22.

[0069] It is understandable that the transmission wheel 24 can be connected to the first segment 224, the second segment 225, or both segments 224 and 225.

[0070] For example, the drive wheel 24 is connected to the first segment 224 by a key.

[0071] The connection between the first segment 224 and the second segment 225 can be a threaded connection, a screw connection, a welding connection, a snap-fit ​​connection, or a flange connection.

[0072] Please see Figure 2In some embodiments, the shaft 22 further includes a connecting screw 226. A connecting section 227 protrudes from the end face of the first segment 224 away from the friction member 23. The connecting section 227 is inserted into the second segment 225. The second segment 225 is provided with a connecting threaded hole 228. The connecting screw 226 is threaded into the connecting threaded hole 228. The end of the shank of the connecting screw 226 abuts against the portion of the connecting section 227 inserted into the second segment 225. The outer peripheral surface of the connecting section 227 and the opposing surfaces between the first segment 224 and the second segment 225 together define a mounting annular groove. This allows for both the connection and fixation of the first segment 224 and the second segment 225, and also improves the separability of the first segment 224 and the second segment 225, thereby enhancing the maintainability of the transmission assembly 20.

[0073] Please see Figure 2 In some embodiments, the transmission assembly 20 further includes a rotary bearing 26. The bracket 21 has a third through hole. The shaft 22 passes through the third through hole. The rotary bearing 26 is arranged in a ring between the wall of the third through hole and the shaft 22. This reduces the frictional force on the shaft 22 relative to the bracket 21 during rotation, thereby improving transmission efficiency.

[0074] It can be understood that the rotary bearing 26 is a part used to support rotating components and reduce friction and wear between the rotating components and stationary components during rotation. Its essence is a mechanical element that converts sliding friction into rolling friction.

[0075] Please see Figure 6 Secondly, embodiments of this application provide an adjustment device 100, which includes the aforementioned transmission assembly 20.

[0076] It is understood that the adjustment device 100 also includes tooling for supporting the positioning screw rotor 30.

[0077] It is understood that the adjustment device 100 includes the aforementioned transmission component 20, and the adjustment device 100 has all the beneficial effects of the aforementioned transmission component 20, which will not be repeated here.

[0078] Please see Figure 7 In some embodiments, two transmission components 20 are provided, with their shafts 22 arranged side by side, and their transmission wheels 24 being meshing gears. In this way, rotational power can be transmitted to the two screw rotors 30 through the two transmission components 20, eliminating the need to install gear sets on the screw rotors 30. This helps protect the surface structural integrity of the screw rotors 30 and improves the adjustment efficiency of the screw rotors 30, thereby increasing the assembly efficiency of the vacuum pump.

[0079] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0081] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A transmission assembly (20), characterized in that, include: Scaffold (21); A shaft (22) is rotatably mounted on the bracket (21); Friction element (23) is located at one end of the shaft (22). The friction element (23) slides along the axial direction of the shaft (22) and is in a stop-fitting relationship with the shaft (22) along the circumference of the shaft (22). A drive wheel (24) is connected to the shaft (22) and is configured to drive the shaft (22) to rotate under the action of force; as well as An adjusting member (25) is movably disposed on the shaft (22) and connected to the friction member (23). The adjusting member (25) is configured to drive the friction member (23) to slide back and forth along the axial direction under the action of force, so that the friction member (23) selectively contacts the shaft end face of the screw rotor.

2. The transmission assembly (20) according to claim 1, characterized in that, The adjusting member (25) includes: A movable rod (251) is inserted into the shaft (22), and one end of the movable rod (251) is connected to the friction element (23); and An adjustment part (252) is connected to the other end of the shaft (22) and the moving rod (251). The adjustment part (252) is configured to drive the moving rod (251) to move back and forth under the action of force, so that the friction member (23) slides back and forth along the axial direction.

3. The transmission assembly (20) according to claim 2, characterized in that, The two ends of the moving rod (251) are respectively movably connected to the friction member (23) and the adjusting part (252); A first groove (221) is provided at one end of the shaft (22) away from the friction member (23). The bottom of the first groove (221) is an arc-shaped concave surface. Part of the adjustment part (252) is disposed in the first groove (221) and contacts the bottom of the first groove (221). The adjustment part (252) is configured to abut against the inner wall of the first groove (221) and rotate around the center of the bottom of the first groove (221) to drive the moving rod (251) to move back and forth.

4. The transmission assembly (20) according to claim 3, characterized in that, The adjusting member (25) also includes a spring (253), which is sleeved on the moving rod (251) and compressed between the friction member (23) and the shaft (22) in the axial direction of the shaft (22).

5. The transmission assembly (20) according to claim 4, characterized in that, The shaft (22) is provided with a mounting hole (222) and a first through hole (223) connected in sequence. Part of the friction element (23) is disposed in the mounting hole (222). The spring (253) is disposed on the side of the friction element (23) near the first through hole (223). The moving rod (251) passes through the first through hole (223). One end of the moving rod (251) extends into the mounting hole (222) to be movably connected with the friction element (23), and the other end extends into the first groove (221) to be connected with the adjusting part (252).

6. The transmission assembly (20) according to any one of claims 3 to 5, characterized in that, A mounting groove (231) is provided at one end of the friction member (23) away from the adjusting part (252), and a second through hole (232) is provided at the bottom of the mounting groove (231). The adjusting member (25) further includes: The first seat (254) is disposed within the mounting slot (231); and The first block (255) is located at the end of the first seat (254) away from the adjusting part (252), and the first block (255) is rotatably engaged with the first seat (254) along the radial direction of the shaft (22); The end of the moving rod (251) away from the adjusting part (252) passes through the second through hole (232), the first seat (254) and is connected to the first block (255).

7. The transmission assembly (20) according to claim 6, characterized in that, The movable rod (251) is threadedly connected to the first block (255); And / or, the first seat (254) is provided with a second groove (2541) at one end away from the adjustment part (252), the first block (255) is a cylindrical structure, at least a portion of the first block (255) is disposed in the second groove (2541) and fits against the inner wall of the second groove (2541).

8. The transmission assembly (20) according to any one of claims 3-5, characterized in that, The adjusting member (25) also includes a second block (256), which is rotatably connected to the adjusting part (252), and the end of the moving rod (251) away from the friction member (23) is connected to the second block (256).

9. The transmission assembly (20) according to claim 8, characterized in that, The movable rod (251) is threadedly connected to the second block (256); And / or, the adjustment part (252) is provided as two, the two adjustment parts (252) are respectively located at both ends of the second block (256), and both are rotatably connected to the second block (256).

10. The transmission assembly (20) according to any one of claims 1 to 5, characterized in that, The shaft (22) includes a first section (224) and a second section (225). The first section (224) is rotatably mounted on the bracket (21). One end of the first section (224) away from the bracket (21) slides along the axial direction with the friction element (23) and stops along the circumference of the shaft (22) with the friction element (23). A portion of the end face of the first segment (224) away from the friction member (23) is connected to the second segment (225), and another portion defines a mounting ring groove between the end face of the first segment (224) and the second segment (225). The inner circumferential side of the transmission wheel (24) is disposed in the mounting ring groove and is connected to the first segment (224) and / or the second segment (225).

11. An adjustment device (100), characterized in that, Includes the transmission assembly (20) as described in any one of claims 1 to 10.

12. The adjusting device (100) according to claim 11, characterized in that, The transmission assembly (20) is configured as two, the shafts (22) of the two transmission assemblies (20) are arranged side by side, and the transmission wheels (24) of the two transmission assemblies (20) are meshing gears.

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