Stator potting tooling and potting method for magnetic levitation molecular pump

Abstract

The present invention provides a stator potting tool and a potting method for a magnetic levitation molecular pump, which belong to the technical field of motor stator potting. The stator potting tool for a magnetic levitation molecular pump comprises: a core shaft, with push blocks connected to both ends respectively, at least one of the push blocks can move along the axial direction of the core shaft, and the opposite ends of the two push blocks have conical surfaces converging toward each other; an expansion component, including a slider and a chuck, and the chuck has a limiting structure suitable for making the slider slide radially outward; a non-metallic sleeve is suitable for elastically sleeved on the outer surface of the expansion component; the stator potting tool for a magnetic levitation molecular pump of the present invention prevents a direct tight fit between the core shaft and the stator assembly, so during the repeated disassembly and assembly of the core shaft, the core shaft will not be worn or scratched, thereby extending the service life of the core shaft.

Description

Technical Field

[0001] The invention relates to the technical field of motor stator potting, and in particular to a stator potting tool and a potting method for a magnetic suspension molecular pump. Background Art

[0002] The magnetic levitation molecular pump uses a magnetic levitation motor to control the speed of the molecular pump rotor assembly. The stator of the magnetic levitation motor includes an upper radial magnetic bearing stator, a motor stator and a lower radial magnetic bearing stator. Each stator and internal sensor needs to be encapsulated with epoxy glue as an integral structure.

[0003] Before potting the motor stator, the mandrel needs to be inserted in the middle of the stator to position the stator radially. Specifically, when inserting the mandrel into the stator, first apply a release agent on the mandrel, then put the stator on the mandrel, and ensure that the stator and the mandrel are coaxial; then fill the stator with epoxy glue for potting. After potting, the mandrel and the stator need to be demoulded and the mandrel needs to be removed from the stator to facilitate potting of the next stator.

[0004] However, since the outer diameter of the core shaft needs to limit the inner diameter of the stator, the core shaft and the stator are tightly fitted or have a small gap, which can easily cause wear and scratches on the core shaft during repeated disassembly and assembly of the core shaft. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the potting tool in the prior art is easily worn and scratched during the repeated disassembly and assembly of the core shaft, thereby providing a stator potting tool for a magnetic levitation molecular pump.

[0006] The invention also provides a potting method.

[0007] The present invention provides a stator potting tool for a magnetic levitation molecular pump, comprising:

[0008] A mandrel, with push blocks connected to both ends, at least one of the push blocks can move along the axial direction of the mandrel, and opposite ends of the two push blocks have conical surfaces converging toward each other;

[0009] The expansion assembly comprises: a plurality of sliders arranged at intervals around the core shaft, the outer surface of the sliders being arc-shaped; and a chuck clamped at the upper and lower ends of the sliders, the chucks having a limiting structure suitable for making the sliders slide radially outward;

[0010] The non-metal sleeve is suitable for elastically sleeved on the outer surface of the expansion component.

[0011] As a preferred solution, the plurality of sliding blocks are formed by dividing a hollow cylinder into equal parts.

[0012] As a preferred solution, the corners of both ends of the plurality of sliders facing the core shaft are chamfered.

[0013] As a preferred solution, the taper of the chamfers of the plurality of sliding blocks is equal to the taper of the conical surface of the pushing block.

[0014] As a preferred solution, threaded holes are respectively provided at both ends of the slider;

[0015] The chuck is provided with an elongated hole opposite to the threaded hole, and the extending direction of the elongated hole corresponds to the radial sliding direction of the slider.

[0016] As a preferred solution, the chuck has a baffle extending toward the slider, the baffle has a plurality of baffles evenly arranged along the circumference of the chuck, and the slider is slidably arranged between two adjacent baffles.

[0017] As a preferred solution, at least one of the pushing blocks is connected to the core shaft by a threaded connection.

[0018] As a preferred solution, the core shaft has an extended end extending out of the expansion assembly, and the extended end is provided with a snap-in structure suitable for snapping with a wrench.

[0019] As a preferred solution, the snap-in structure is an external hexagonal cap.

[0020] The present invention also provides a potting method for a stator of a magnetic levitation molecular pump, using any of the above-mentioned stator potting tools for a magnetic levitation molecular pump, comprising the following steps:

[0021] Assembling the potting tool: evenly arranging multiple sliders around the core shaft; connecting the lower ends of the multiple sliders to the first chuck; sleeve the non-metallic sleeve from the upper end of the slider downward onto the outer surface of the multiple sliders; connecting the upper ends of the multiple sliders to the second chuck;

[0022] Place the potting tool into the arranged stator assembly;

[0023] Twist the push block to push the multiple sliders outward evenly in the radial direction to make the non-metallic sleeve and the stator assembly close to each other;

[0024] Casting resin, pouring resin between the stator assembly and the non-metallic sleeve;

[0025] Remove the potting tooling, reversely rotate the push block to allow the slider to move toward the center, and take out the potting tooling.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The present invention provides a stator potting tool for a magnetic levitation molecular pump, comprising: a core shaft, an expansion component and a non-metallic sleeve; a plurality of sliders are arranged in the non-metallic sleeve, a core shaft is passed through the plurality of sliders, pushing blocks are arranged at both ends of the core shaft, and a pushing block with a conical surface is arranged on the pushing block; the stator assembly to be potted is installed on the outer surface of the non-metallic sleeve, and the conical surface on the pushing block can push the sliders away from each other and push the non-metallic sleeve by rotating the pushing block, so that the non-metallic sleeve and the stator assembly are fitted; when disassembly and assembly are required, the pushing block is rotated, the sliders are brought closer to each other, so that the stator assembly and the non-metallic sleeve are separated, and the potting tool is disassembled; the device prevents the core shaft and the stator assembly from being directly tightly fitted, so that during the repeated disassembly and assembly of the core shaft, the core shaft will not be worn or scratched, thereby extending the service life of the core shaft;

[0028] 2. The present invention provides a stator potting tool for a magnetic levitation molecular pump, wherein the plurality of sliders are formed by equally dividing a hollow cylinder; the sliders are evenly distributed around the core shaft, and the extrusion of the non-metallic sleeve is more uniform.

[0029] 3. The present invention provides a stator potting tool for a magnetic levitation molecular pump, wherein the corners of both ends of a plurality of sliders facing the core shaft are chamfered, and the taper of the chamfer is equal to the taper of the conical surface of the push block; so that the slider is relatively smooth during the outward movement.

[0030] 4. The present invention provides a stator potting tool for a magnetic levitation molecular pump, wherein the long strip hole is arranged to limit the moving direction of the slider, so that the slider slides along a predetermined radial direction, and the two sliders do not move close to each other; the setting of the baffle ensures the consistency of the initial position of the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the internal structure of the stator potting tooling of the present invention.

[0033] Figure 2 It is a top view of the stator assembly and potting tooling of the present invention.

[0034] Figure 3 for Figure 2 A cross-sectional view of AA is shown.

[0035] Figure 4 for Figure 2 A schematic diagram of the three-dimensional structure of multiple sliders is shown.

[0036] Figure 5 for Figure 2 A schematic diagram of the three-dimensional structure of the chuck shown.

[0037] Description of reference numerals:

[0038] 1. Stator assembly; 2. Mandrel; 3. Non-metallic sleeve; 4. Slider; 5. First push block; 6. Second push block; 7. Chuck; 8. Hexagonal cap; 9. Chamfer; 10. Threaded hole; 11. Baffle; 12. Long hole. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] This embodiment provides a stator potting tool for a magnetic suspension molecular pump, such as Figure 1As shown, it includes: a core shaft 2 with push blocks connected to both ends respectively, an expansion component and a non-metallic sleeve 3 elastically sleeved on the outer surface of the expansion component, and the stator component 1 to be filled is installed on the outer surface of the non-metallic sleeve 3. By rotating the push block, the conical surface on the push block can push the sliders 4 away from each other, push the non-metallic sleeve 3, so that the non-metallic sleeve 3 and the stator component 1 are fitted; when disassembly and assembly are required, the push block is rotated, the sliders 4 are close to each other, so that the stator component 1 and the non-metallic sleeve 3 are separated, and the potting tool is removed; the device prevents the core shaft 2 and the stator component 1 from being directly tightly fitted, so that during the repeated disassembly and assembly of the core shaft 2, the core shaft 2 will not be worn or scratched, thereby extending the service life of the core shaft 2.

[0044] like Figure 2 , 3 As shown, the upper end of the core shaft 2 is connected to a first push block 5 through a threaded connection. Through the threaded connection, the first push block 5 can move along the axial direction of the core shaft 2. The lower end of the core shaft 2 is provided with a second push block 6. The opposite ends of the first push block 5 and the second push block 6 have conical surfaces converging toward each other; and the tapers of the first push block 5 and the second push block 6 are equal.

[0045] like Figure 4 As shown, eight sliders 4 are arranged around the mandrel 2. The eight sliders 4 are formed by equally dividing a hollow cylinder. The inner diameter of the hollow cylinder is equal to the outer diameter of the mandrel 2, which can ensure that the multiple sliders 4 have an expansion reference during the expansion process. At the same time, the corners of the two ends of the multiple sliders 4 facing the mandrel 2 are chamfered 9; the taper of the chamfer 9 of the slider 4 is equal to the taper of the first push block 5 and the second push block 6; chucks 7 are arranged at both ends of the slider 4 to limit the movement of the slider 4.

[0046] As an alternative implementation, the number of sliders 4 may be 3, 6 or 12.

[0047] like Figure 5 As shown, threaded holes 10 are respectively provided at both ends of the slider 4, and a long hole 12 corresponding to the threaded hole 10 is provided on the chuck 7, and the extension direction of the long hole is consistent with the radial movement direction of the slider 4; a plurality of baffles 11 are provided on the opposite sides of the two chucks 7, and the baffles 11 extend toward the direction of the slider 4, and the plurality of baffles 11 are evenly arranged along the circumferential direction of the chuck 7, and the slider 4 is arranged between two adjacent baffles 11; in this way, the consistency of the initial position of the slider 4 can be ensured.

[0048] A through hole is provided in the middle of the chuck 7, and the core shaft 2 passes through the through hole of the chuck 7 and extends from the middle of the slider 4. A hexagonal cap 8 is provided on the extended end, and the setting of the hexagonal cap 8 is convenient for the wrench to clamp it.

[0049] like Figure 3 As shown, the outer surface of the slider 4 is sleeved with a non-metallic sleeve 3, which has a certain elasticity and can be a silicone tube. After the non-metallic sleeve 3 is sleeved on the slider 4, it is mainly convenient for later demoulding.

[0050] Usage and principle

[0051] Assemble the potting tooling: place multiple sliders 4 evenly around the core shaft 2, and place the lower end of each slider 4 between two adjacent baffles 11 of the chuck 7. Screw the bolts through the long holes 12 of the chuck 7 and the threaded holes 10 on the slider 4 to fix the chuck 7 and the slider 4. Insert the non-metallic sleeve 3 from the upper end of the slider 4. After inserting, ensure that the entire non-metallic sleeve 3 is flat; fix the upper chuck 7 and the slider 4;

[0052] Place the potting tool into the arranged stator assembly 1;

[0053] Use a wrench to clamp the hexagonal cap 8, and turn the first push block 5. Under the pressure of the first push block 5, the slider 4 slides outward and gradually moves downward. In the process of moving downward, it is squeezed by the second push block 6 at the same time. Under the simultaneous pressure of the first push block 5 and the second push block 6, multiple sliders push outward in different radial directions; at the same time, the upper and lower ends of the slider are simultaneously subjected to the force of sliding outward, and the slider is made of hard material, so that the slider moves in the radial direction as a whole in the vertical direction at the same time, and the movement of each position of the slider in the vertical direction is consistent. At the same time, under the action of the non-metallic sleeve 3 and the upper and lower nuts, the movement of the slider 4 is orderly and will not move in the circumferential direction of the chuck; multiple sliders 4 move outward to squeeze the non-metallic sleeve 3, and due to the flexibility of the sleeve itself, the non-metallic sleeve 3 and the stator assembly 1 are tightly attached;

[0054] Pouring resin: pouring resin between the stator component 1 and the non-metal sleeve 3;

[0055] To disassemble the potting tool, reversely twist the first push block 5 to move the slider 4 toward the center, and then take out the potting tool.

[0056] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A stator potting tool for a magnetic levitation molecular pump, characterized in that: include: A core shaft (2), with push blocks connected to both ends respectively, at least one of the push blocks being movable along the axial direction of the core shaft (2), and opposite ends of the two push blocks having conical surfaces converging toward each other; An expansion assembly, comprising: a plurality of sliders (4) arranged at intervals around the core shaft (2), the outer surface of the sliders (4) being arc-shaped; and a chuck (7) clamped at the upper and lower ends of the slider (4), the chuck (7) having a limiting structure suitable for causing the slider (4) to slide radially outward; A non-metallic sleeve (3) adapted to be elastically sleeved on the outer surface of the expansion component; The plurality of sliding blocks (4) are formed by dividing a hollow cylinder into equal parts; The two ends of the slider (4) are respectively provided with threaded holes (10); The chuck (7) has an elongated hole opposite to the threaded hole (10), and the extending direction of the elongated hole corresponds to the radial sliding direction of the slider (4); The chuck (7) has a baffle (11) extending in the direction of the slider (4), the baffle (11) comprises a plurality of baffles (11) uniformly arranged along the circumference of the chuck (7), and the slider (4) is slidably arranged between two adjacent baffles (11); At least one of the pushing blocks is threadedly connected to the core shaft (2).

2. The stator potting tool for a magnetic levitation molecular pump according to claim 1, characterized in that: The corners of both ends of the plurality of slide blocks (4) facing the core shaft (2) are chamfered (9).

3. The stator potting tool for a magnetic levitation molecular pump according to claim 2, characterized in that: The taper of the chamfers (9) of the plurality of sliding blocks (4) is equal to the taper of the conical surface of the pushing block.

4. The stator potting tool for a magnetic levitation molecular pump according to claim 1, characterized in that: The core shaft (2) has an extended end extending out of the expansion assembly, and a snap-in structure suitable for snapping with a wrench is provided on the extended end.

5. The stator potting tool for a magnetic levitation molecular pump according to claim 4, characterized in that: The snap-in structure is an external hexagonal cap (8).

6. A potting method for a stator of a magnetic levitation molecular pump, characterized in that: The stator potting tool for a magnetic levitation molecular pump according to any one of claims 1 to 5 comprises the following steps: Assembling the potting tool: evenly arranging a plurality of sliders (4) around the core shaft (2); connecting the lower ends of the plurality of sliders (4) to a first chuck (7); sleeve-mounting a non-metallic sleeve (3) from the upper ends of the sliders (4) downward onto the outer surfaces of the plurality of sliders (4); connecting the upper ends of the plurality of sliders (4) to a second chuck (7); Place the potting tool into the arranged stator assembly (1); The push block is screwed to push the plurality of slide blocks (4) outward evenly in the radial direction, so that the non-metallic sleeve (3) and the stator assembly (1) are in close contact with each other; pouring resin, pouring resin between the stator component (1) and the non-metallic sleeve (3); Remove the potting tooling, rotate the push block in the opposite direction so that the slider (4) can move toward the center, and remove the potting tooling.

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