CN111917254A

CN111917254A - Stator encapsulating tool and encapsulating method for magnetic suspension molecular pump

Info

Publication number: CN111917254A
Application number: CN202010805834.5A
Authority: CN
Inventors: 陈林; 刘强; 张亮
Original assignee: Beijing Zhongke Jiuwei Technology Co ltd
Current assignee: Beijing Zhongke Jiuwei Technology Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-11-10

Abstract

The invention provides a stator filling and sealing tool and a filling and sealing method for a magnetic suspension molecular pump, belongs to the technical field of motor stator filling and sealing, and the stator filling and sealing tool for the magnetic suspension molecular pump comprises: the two ends of the mandrel are respectively connected with a pushing block, at least one pushing block can move along the axial direction of the mandrel, and the opposite ends of the two pushing blocks are provided with conical surfaces converging towards each other; the expansion assembly comprises a sliding block and a chuck, wherein the chuck is provided with a limiting structure which is suitable for enabling the sliding block to slide outwards along the radial direction; the non-metal sleeve is suitable for being sleeved on the outer surface of the expansion assembly in an elastic manner; according to the stator potting tool for the magnetic suspension molecular pump, the direct tight fit between the mandrel and the stator assembly cannot occur, so that the mandrel cannot be abraded or scratched in the repeated dismounting process of the mandrel, and the service life of the mandrel is prolonged.

Description

Stator encapsulating tool and encapsulating method for magnetic suspension molecular pump

Technical Field

The invention relates to the technical field of motor stator encapsulation, in particular to a stator encapsulation tool and an encapsulation method for a magnetic suspension molecular pump.

Background

The magnetic suspension molecular pump realizes the rotation speed control of a molecular pump rotor component by using a magnetic suspension motor, a stator of the magnetic suspension motor comprises an upper radial magnetic bearing stator, a motor stator and a lower radial magnetic bearing stator, and each stator and an internal sensor are encapsulated into an integral structure by using epoxy glue.

Before the motor stator is encapsulated, the mandrel needs to be inserted in the middle of the stator to position the stator in the radial direction. Specifically, when the mandrel is inserted into the stator, a release agent is coated on the mandrel, then the stator is sleeved on the mandrel, and the stator and the mandrel are ensured to be coaxial; then, epoxy glue is poured between the stators for encapsulation, after encapsulation is finished, the core shaft and the stators are required to be demoulded, and the core shaft is taken out of the stators so as to be conveniently used for encapsulation of the next stator.

However, since the outer diameter of the mandrel needs to limit the inner diameter of the stator, the mandrel and the stator are tightly fitted or have a small gap, and the mandrel is easily worn and scratched during repeated assembly and disassembly of the mandrel.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the encapsulation tool in the prior art is easy to wear and scratch in the repeated assembly and disassembly process of the mandrel, so that the stator encapsulation tool for the magnetic suspension molecular pump is provided.

The invention also provides an encapsulating method.

The invention provides a stator potting tool for a magnetic suspension molecular pump, which comprises:

the two ends of the mandrel are respectively connected with a pushing block, at least one pushing block can move along the axial direction of the mandrel, and the opposite ends of the two pushing blocks are provided with conical surfaces converging towards each other;

an inflation assembly comprising: a plurality of sliding blocks are arranged around the mandrel at intervals, and the outer surfaces of the sliding blocks are arc-shaped; further comprising: the clamping disc is clamped at the upper end and the lower end of the sliding block, and the clamping disc is provided with a limiting structure which is suitable for enabling the sliding block to slide outwards along the radial direction;

and the non-metal sleeve is suitable for being sleeved on the outer surface of the expansion assembly in an elastic manner.

Preferably, the plurality of sliding blocks are formed by equally dividing a hollow cylinder.

Preferably, the corners of the two ends of the sliding blocks facing the mandrel are chamfered.

Preferably, the taper of the chamfer of the sliding blocks is equal to the taper of the conical surface of the pushing block.

As a preferred scheme, two ends of the sliding block are respectively provided with a threaded hole;

the chuck is provided with a long hole opposite to the threaded hole, and the extending direction of the long hole corresponds to the radial sliding direction of the sliding block.

Preferably, the chuck is provided with baffle plates extending towards the direction of the slide block, the baffle plates are provided with a plurality of blocks uniformly arranged along the circumferential direction of the chuck, and the slide block is arranged between two adjacent baffle plates in a sliding manner.

Preferably, at least one pushing block is in threaded connection with the mandrel.

Preferably, the mandrel is provided with an extending end extending out of the expansion assembly, and the extending end is provided with a clamping structure suitable for being clamped with a wrench.

Preferably, the snap-in structure is an external hexagonal cap.

The invention also provides an encapsulating method for the stator of the magnetic suspension molecular pump, which adopts any one of the encapsulating tools for the stator of the magnetic suspension molecular pump, and comprises the following steps:

assembling an encapsulating tool: uniformly arranging a plurality of sliding blocks around a mandrel; connecting the lower ends of the plurality of sliding blocks with a first chuck; sleeving a non-metal sleeve on the outer surfaces of the sliding blocks from the upper ends of the sliding blocks downwards; connecting the upper ends of the sliding blocks with a second chuck;

placing the encapsulation tool into the placed stator assembly;

screwing a pushing block to push the sliding blocks outwards and uniformly along the radial direction so as to enable the non-metal sleeve to be tightly attached to the stator assembly;

pouring resin, namely pouring resin between the stator assembly and the non-metal sleeve;

dismantle the embedment frock, reverse revolve twist and promote the piece, make the slider remove towards central direction, take out the embedment frock.

The technical scheme of the invention has the following advantages:

1. the invention provides a stator potting tool for a magnetic suspension molecular pump, which comprises: a mandrel, an expansion assembly and a non-metallic sleeve; a plurality of sliding blocks are arranged in the non-metal sleeve, a mandrel penetrates through the plurality of sliding blocks, pushing blocks are arranged at two ends of the mandrel, and pushing blocks with conical surfaces are arranged on the pushing blocks; the stator assembly to be filled is installed on the outer surface of the non-metal sleeve, and the conical surface on the pushing block can push the sliding blocks to be away from each other by rotating the pushing block to push the non-metal sleeve, so that the non-metal sleeve is attached to the stator assembly; when the encapsulating tool needs to be disassembled and assembled, the pushing block is rotated, the sliding blocks are close to each other, so that the stator assembly and the non-metal sleeve are separated, and the encapsulating tool is disassembled; the device prevents the mandrel and the stator assembly from being directly tightly matched, so that the mandrel is not abraded or scratched in the repeated dismounting process of the mandrel, and the service life of the mandrel is prolonged;

2. the invention provides a stator potting tool for a magnetic suspension molecular pump, which is formed by equally dividing a plurality of sliding blocks into a hollow cylinder; the sliding blocks are uniformly distributed around the mandrel, and the non-metal sleeve is extruded more uniformly.

3. The invention provides a stator potting tool for a magnetic suspension molecular pump, wherein corners of two ends of a plurality of sliding blocks facing a mandrel are chamfers, and the conicity of the chamfers is equal to that of the conical surface of a pushing block; so that the slide block is relatively smooth in the outward movement process.

4. According to the stator potting tool for the magnetic suspension molecular pump, the long-strip hole is arranged to limit the moving direction of the sliding block, so that the sliding block slides along the preset radial direction, and the two sliding blocks cannot move close to each other; the arrangement of the baffle plate ensures the consistency of the initial position of the slide block.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of an internal structure of the stator potting tool of the present invention.

Fig. 2 is a top view of a stator assembly and potting fixture of the present invention.

Fig. 3 is a cross-sectional view a-a shown in fig. 2.

Fig. 4 is a schematic perspective view of a plurality of sliders shown in fig. 2.

Fig. 5 is a perspective view of the chuck shown in fig. 2.

Description of reference numerals:

1. a stator assembly; 2. a mandrel; 3. a non-metallic sheath; 4. a slider; 5. a first pushing block; 6. a second pushing block; 7. a chuck; 8. a hexagonal cap; 9. chamfering; 10. a threaded hole; 11. a baffle plate; 12. and (4) a long hole.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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

The stator potting tool for the magnetic levitation molecular pump provided by the embodiment, as shown in fig. 1, includes: the two ends of the mandrel 2 are respectively connected with a pushing block, the expansion assembly and the non-metal sleeve 3 which is elastically sleeved on the outer surface of the expansion assembly, the stator assembly 1 to be filled is installed on the outer surface of the non-metal sleeve 3, and by rotating the pushing block, the conical surface on the pushing block can push the sliding blocks 4 to be away from each other and push the non-metal sleeve 3, so that the non-metal sleeve 3 is attached to the stator assembly 1; when the encapsulating tool needs to be disassembled and assembled, the pushing block is rotated, the sliding blocks 4 are close to each other, so that the stator assembly 1 and the non-metal sleeve 3 are separated, and the encapsulating tool is disassembled; the device makes the condition emergence that direct tight fit can not appear between dabber 2 and stator module 1, so at dabber 2's the dismouting in-process that relapses, also can not cause the condition emergence of wearing and tearing and scratch to dabber 2, has prolonged dabber 2's life.

As shown in fig. 2 and 3, the upper end of the mandrel 2 is connected with a first pushing block 5 through a screw thread, the first pushing block 5 can move along the axial direction of the mandrel 2 through the screw thread connection, the lower end of the mandrel 2 is provided with a second pushing block 6, and the opposite ends of the first pushing block 5 and the second pushing block 6 are provided with conical surfaces converging towards each other; and the taper of the first pushing block 5 and the second pushing block 6 is equal.

As shown in fig. 4, the mandrel 2 is provided with 8 sliding blocks 4, the 8 sliding blocks 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, and it can be ensured that the sliding blocks 4 have an expansion reference in the expansion process. Meanwhile, the corners of the two ends of the sliding blocks 4 facing the mandrel 2 are chamfers 9; the conicity of the chamfer 9 of the sliding block 4 is equal to that of the first pushing block 5 and the second pushing block 6; chucks 7 are arranged at two ends of the sliding block 4 to limit the movement of the sliding block 4.

As an alternative embodiment, the number of the sliders 4 may be 3, 6, 12, etc.

As shown in fig. 5, threaded holes 10 are respectively provided at both ends of the slider 4, the chuck 7 is provided with a long hole 12 corresponding to the threaded hole 10, and the extending direction of the long hole is consistent with the radial moving direction of the slider 4; a plurality of baffle plates 11 are arranged on the opposite surfaces of the two chucks 7, the baffle plates 11 extend towards the direction of the sliding block 4, the baffle plates 11 are uniformly arranged along the circumferential direction of the chucks 7, and the sliding block 4 is arranged between the two adjacent baffle plates 11; this ensures the consistency of the initial position of the slider 4.

The middle part of chuck 7 is provided with the through-hole, and dabber 2 passes the through-hole of chuck 7 and stretches out from the middle part of slider 4, stretches out to serve and is provided with hexagon cap 8, and hexagon cap 8 sets up and makes things convenient for the spanner to its joint.

As shown in fig. 3, a non-metal sleeve 3 is sleeved on the outer surface of the sliding block 4, the non-metal sleeve 3 has certain elasticity, and the non-metal sleeve 3 can be a silicone tube; after the non-metal sleeve 3 is sleeved on the sliding block 4, the later-stage demoulding is facilitated.

Method of use and principles

Assembling an encapsulating tool: a plurality of sliding blocks 4 are uniformly placed around the mandrel 2, the lower end of each sliding block 4 is placed between two adjacent baffle plates 11 of the chuck 7, a bolt penetrates through a long hole 12 of the chuck 7 and is screwed with a threaded hole 10 on the sliding block 4, the chuck 7 and the sliding block 4 are fixed, the non-metal sleeve 3 is sleeved in from the upper end of the sliding block 4, and after the non-metal sleeve is sleeved in, the flatness of the whole non-metal sleeve 3 is ensured; fixing the chuck 7 at the upper end with the slide block 4;

placing the encapsulating tool into the placed stator assembly 1;

the hexagonal cap 8 is clamped through a wrench, the first pushing block 5 is rotated, the sliding blocks 4 slide outwards under the extrusion of the first pushing block 5 and can also gradually move downwards, the sliding blocks are simultaneously extruded by the second pushing block 6 in the downward moving process, and the sliding blocks are not pushed outwards along the radial direction under the simultaneous extrusion of the first pushing block 5 and the second pushing block 6; meanwhile, the upper end and the lower end of the sliding block are simultaneously subjected to outward sliding force, and the sliding block is made of hard materials, so that the sliding block integrally moves along the radial direction in the vertical direction at the same time, and the movement of each position of the sliding block in the vertical direction is consistent. Meanwhile, under the action of the non-metal sleeve 3 and the upper and lower nuts, the sliding block 4 moves orderly and cannot move along the circumferential direction of the chuck; the sliding blocks 4 move outwards to extrude the non-metal sleeve 3, and the non-metal sleeve 3 is tightly attached to the stator assembly 1 due to the flexibility of the sliding sleeve;

pouring resin between the stator assembly 1 and the non-metal sleeve 3;

dismantle the embedment frock, reverse revolve twist first promotion piece 5 for slider 4 removes towards the central direction, takes out the embedment frock.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. The utility model provides a stator embedment frock for magnetic levitation molecular pump which characterized in that includes:

the two ends of the mandrel (2) are respectively connected with pushing blocks, at least one pushing block can move along the axial direction of the mandrel (2), and the opposite ends of the two pushing blocks are provided with conical surfaces converging towards each other;

an inflation assembly comprising: a plurality of sliding blocks (4) are arranged around the mandrel (2) at intervals, and the outer surfaces of the sliding blocks (4) are arc-shaped; further comprising: the clamping disc (7) is clamped at the upper end and the lower end of the sliding block (4), and the clamping disc (7) is provided with a limiting structure which is suitable for enabling the sliding block (4) to slide outwards along the radial direction;

and the non-metal sleeve (3) is suitable for being sleeved on the outer surface of the expansion component in an elastic manner.

2. The stator potting tool for a magnetic levitation molecular pump as claimed in claim 1, wherein the plurality of sliders (4) are formed by equally dividing a hollow cylinder.

3. The stator potting tool for a magnetic levitation molecular pump as claimed in claim 1, wherein corners of two ends of the plurality of sliding blocks (4) facing the mandrel (2) are chamfered (9).

4. The stator potting tool for a magnetic levitation molecular pump as claimed in claim 3, wherein the taper of the chamfer (9) of the plurality of sliding blocks (4) is equal to the taper of the conical surface of the pushing block.

5. The stator potting tool for a magnetic levitation molecular pump as claimed in any one of claims 1 to 4, wherein both ends of the slider (4) are respectively provided with a threaded hole (10);

the chuck (7) is provided with a long hole opposite to the threaded hole (10), and the extending direction of the long hole corresponds to the radial sliding direction of the sliding block (4).

6. The stator potting tool for the magnetic levitation molecular pump as claimed in claim 5, wherein the chuck (7) is provided with a baffle (11) extending towards the direction of the sliding block (4), the baffle (11) is provided with a plurality of blocks uniformly arranged along the circumferential direction of the chuck (7), and the sliding block (4) is slidably arranged between two adjacent baffles (11).

7. Stator potting tool for a magnetic levitation molecular pump according to any of claims 1 to 4, characterized in that a threaded connection is used between at least one of the push blocks and the mandrel (2).

8. The stator potting tool for a magnetic levitation molecular pump as claimed in claim 7, wherein the mandrel (2) has an extended end extending out of the expansion assembly, and the extended end is provided with a snap-in structure adapted to be snapped in with a wrench.

9. Stator potting tool for a magnetic levitation molecular pump according to claim 8, characterized in that the snap-in structure is an outer hexagon cap (8).

10. The encapsulating method for the stator of the magnetic levitation molecular pump is characterized in that the stator encapsulating tool for the magnetic levitation molecular pump, which is used according to any one of claims 1 to 9, comprises the following steps:

assembling an encapsulating tool: uniformly arranging a plurality of sliding blocks (4) around the mandrel (2); the lower ends of the sliding blocks (4) are connected with a first chuck (7); sleeving a non-metal sleeve (3) downwards onto the outer surfaces of a plurality of sliding blocks (4) from the upper ends of the sliding blocks (4); connecting the upper ends of the sliding blocks (4) with a second chuck (7);

placing the encapsulating tool into the placed stator assembly (1);

screwing a pushing block to push the sliding blocks (4) outwards and uniformly along the radial direction so as to enable the non-metal sleeve (3) to be tightly attached to the stator assembly (1);

pouring resin, namely pouring resin between the stator assembly (1) and the non-metal sleeve (3);

dismantle the embedment frock, reverse revolve twist and promote the piece, make slider (4) can move towards central direction, take out the embedment frock.