Vacuum shielded motor housing with viewing window

Abstract

The utility model belongs to motor technical field especially relates to a vacuum shielding motor casing with observation window. Including motor shell, the stator assembly of being located in the motor shell and rotatably being located in the inside of stator assembly rotor assembly, add stator shield between the rotor assembly and stator assembly, the stator shield includes the tubular shield sleeve of being arranged in the periphery of rotor assembly coaxially and passing the inner chamber of stator assembly, the tubular shield sleeve front end is provided with shield end cap, and this shield end cap is equipped with the central hole of passing through rotor shaft, the tubular shield sleeve rear end is provided with shield tail cover, and this shield tail cover is equipped with observation window subassembly, the tubular shield sleeve and rotor assembly form first annular gap between, and with stator assembly inner wall form second annular gap. It can realize real -time monitoring internal working condition under the operation state, and provides multilayer sealing guarantee vacuum environment stability, reduces unnecessary disassembly maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a vacuum shielded motor housing with an observation window. Background Technology

[0002] Existing vacuum pump motors have the following technical defects during operation:

[0003] Lack of visual monitoring: Traditional motor housings are fully enclosed structures, making it impossible to observe the internal rotor operation status, bearing lubrication, and component wear (such as sparks, cracks, etc.) in real time. This results in delayed fault warnings and maintenance relying on periodic disassembly, which is inefficient.

[0004] Insufficient vacuum sealing: Ordinary motor housings cannot simultaneously provide dynamic sealing (the area through which the rotor shaft passes) and static sealing (the housing connection surface), which can easily lead to vacuum leakage and affect pump performance.

[0005] High maintenance costs: Because the internal condition cannot be directly judged, frequent shutdowns and disassembly are required, increasing labor and time costs, and the disassembly and assembly process may damage the sealing structure. Summary of the Invention

[0006] This utility model addresses the shortcomings of existing technologies by providing a vacuum shielded motor housing with an observation window.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a vacuum shielded motor housing with an observation window, comprising a motor housing, a stator assembly disposed within the motor housing, and a rotor assembly rotatably disposed inside the stator assembly. A stator shield is added between the rotor assembly and the stator assembly. The stator shield includes a cylindrical shield sleeve coaxially disposed around the rotor assembly and passing through the inner cavity of the stator assembly. A shield end cap is provided at the front end of the cylindrical shield sleeve, and the shield end cap has a central hole for the rotor shaft to pass through. A shield tail cap is provided at the rear end of the cylindrical shield sleeve, and the shield tail cap has an observation window assembly. The shield end cap and the shield tail cap are respectively sealed to the motor housing, and a first annular gap is formed between the cylindrical shield sleeve and the rotor assembly, and a second annular gap is formed between the cylindrical shield sleeve and the inner wall of the stator assembly.

[0008] Furthermore, the observation window assembly includes an observation hole on the shielding tail cover, an observation window covering the observation hole, and an annular pressure plate fixed to the shielding tail cover by evenly distributed fasteners. The inner diameter of the pressure plate is smaller than the outer diameter of the observation window so that the observation window is partially exposed.

[0009] Furthermore, the mounting end face of the shielding tail cover is provided with an annular sealing groove, and a sealing ring is embedded in the sealing groove to achieve a static seal between the observation window and the shielding tail cover.

[0010] Furthermore, the pressure plate is fixed by evenly distributed screws, which are tightened symmetrically in a cross pattern during installation.

[0011] Furthermore, the end face of the shielding end cap is provided with a second sealing groove for sealing cooperation with the vacuum pump flange.

[0012] Furthermore, the width of the first annular gap is 1-3 mm, and the width of the second annular gap is 0.5-2 mm.

[0013] Furthermore, the shielding sleeve is sealed to the shielding end cap and the shielding tail cap by circumferential welding.

[0014] Furthermore, the shielding sleeve is made of thin-walled non-magnetic metal material with a wall thickness of 1.5mm-3mm.

[0015] Furthermore, the observation window is made of borosilicate glass or quartz glass, and the choice of material is determined based on the vacuum level of the working environment.

[0016] Furthermore, the fasteners of the pressure plate are four M5 hex socket screws. The mounting holes of the four M5 hex socket screws are evenly distributed at 90° on the shielding tail cover, and they are tightened to the rated torque in stages in a diagonal sequence during installation.

[0017] Compared with the prior art, this utility model has the following advantages.

[0018] This utility model features a shielding cover and a visualization window, enabling real-time monitoring of the internal operating conditions during operation; it also provides multi-layer sealing to ensure the stability of the vacuum environment and reduce unnecessary disassembly and maintenance. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0020] Figure 1 A three-dimensional viewing device for vacuum shielded motor housing with an observation window. Figure 1 .

[0021] Figure 2 A three-dimensional viewing device for vacuum shielded motor housing with an observation window. Figure 2 .

[0022] Figure 3 This is a front view of a vacuum shielded motor housing with an observation window.

[0023] Figure 4 yes Figure 3 AA sectional view.

[0024] Figure 5 This is a cross-sectional view of the assembly of a vacuum shielded motor housing shielding cover with an observation window.

[0025] Figure 6 It is an exploded view of a vacuum shielded motor housing with an observation window.

[0026] Figure 7 This is a three-dimensional view of a vacuum shielded motor housing shielding cover with an observation window.

[0027] Figure 8 This is a cross-sectional view of a vacuum shielded motor housing shield with an observation window.

[0028] In the diagram, 1. Motor housing; 2. Stator assembly; 3. Rotor assembly; 4. Drive shaft; 5. Vacuum pump; 6. Stator shield; 7. Observation window pressure plate; 8. Observation window; 9. Sealing ring; 601. Shielding sleeve; 602. Shielding end cover; 603. Shielding tail cover; 604. Observation hole; 605. Center hole; 606. Sealing groove two; 607. Sealing groove one. Detailed Implementation

[0029] Example: Figure 1-8 As shown, the vacuum shielded motor housing with an observation window includes a motor housing 1, a stator assembly 2 disposed within the motor housing 1, and a rotor assembly 3 rotatably disposed inside the stator assembly 2. A stator shield 6 is added between the rotor assembly 3 and the stator assembly 2. The stator shield 6 includes a cylindrical shielding sleeve 601 coaxially disposed around the rotor assembly 3 and passing through the inner cavity of the stator assembly 2. A shielding end cap 602 is provided at the front end of the cylindrical shielding sleeve 601, and the shielding end cap 602 has a central hole 605 for the rotor shaft to pass through. A shielding tail cap 603 is provided at the rear end of the cylindrical shielding sleeve 601, and the shielding tail cap 603 has an observation window assembly. The rear end refers to the end away from the vacuum pump after installation, and the front end refers to the end close to the vacuum pump during installation. The rotor shaft is also known as the drive shaft 4.

[0030] The shielding end cap 602 and the shielding tail cap 603 are respectively sealed to the motor housing 1, and the cylindrical shielding sleeve 601 forms a first annular gap with the rotor assembly 3 and a second annular gap with the inner wall of the stator assembly 2. The width of the first annular gap (between the rotor assembly and the shielding sleeve) is 1-3 mm, used to attenuate stray magnetic fields from the rotor while preventing a significant increase in magnetic reluctance due to an excessively large gap. The width of the second annular gap (between the shielding sleeve and the stator assembly) is 0.5-2 mm. This distance ensures a safe insulation distance between the stator windings and the shielding sleeve, and also allows for thermal expansion.

[0031] Preferably, the observation window assembly includes an observation hole 604 on the shielding tail cover 603, an observation window 8 covering the observation hole 604, and an annular pressure plate 7 fixed to the shielding tail cover 603 by evenly distributed fasteners. The inner diameter of the pressure plate 7 is smaller than the outer diameter of the observation window 8 to partially expose the observation window 8. The observation window 8 is made of borosilicate glass or quartz glass, and the material selection is determined according to the vacuum level of the working environment. The pressure plate 7 is fixed by evenly distributed screws, which are tightened symmetrically during installation. The fasteners of the pressure plate 7 are four M5 hexagon socket screws, and the mounting holes of the four M5 hexagon socket screws are evenly distributed at 90° on the shielding tail cover 603. During installation, they are tightened in stages according to the diagonal sequence to the rated torque. The mounting screws of the observation window pressure plate must be tightened evenly in a symmetrical sequence to prevent the observation window from cracking due to local stress. The observation window needs to be made of a suitable material according to different vacuum levels, and the material needs to have a transparent effect.

[0032] In one possible embodiment, in the observation window assembly, the sealing ring 9 is disposed within the annular sealing groove of the shielding tail cap 603, and the outer diameter of the observation window 8 is larger than the diameter of the observation hole 604. The end face of the shielding end cap 602 is used for docking and fixed connection with the vacuum pump 5.

[0033] Preferably, the mounting end face of the shielding tail cover 603 is provided with an annular sealing groove 607, in which a sealing ring 9 is embedded to achieve a static seal between the observation window 8 and the shielding tail cover 603. Furthermore, the shielding sleeve 601, the shielding end cover 602, and the shielding tail cover 603 are sealed together by circumferential welding. The shielding sleeve 601 is made of thin-walled non-magnetic metal with a wall thickness of 1.5mm-3mm.

[0034] Another possible embodiment involves inserting one end of the shielding sleeve into the central hole of the shielding end cap, aligning the end face of the shielding sleeve with the end face of the shielding end cap, and welding the circumference of the mating area to seal one end of the shielding sleeve. Then, the shielding tail cap is inserted into the other end of the shielding sleeve, sealing this end face of the shielding sleeve, and the circumference of the mating area is welded. The shielding sleeve, shielding end cap, and shielding tail cap together form a stator shielding cover structure with a central hole at one end and an observation hole at the other end.

[0035] Another possible embodiment involves evenly distributed threaded holes around the observation hole of the shielding tail cover. The observation window pressure plate has mounting through holes corresponding to the threaded holes of the shielding tail cover. The sealing ring is placed into the sealing groove on the shielding tail cover, and then the observation window is placed on the observation hole protrusion of the shielding tail cover. The outer diameter of the observation window is larger than the observation hole, and the observation window presses down on the sealing ring. The observation window pressure plate then presses down on the observation window. A locking screw is inserted into the through hole of the observation window pressure plate, and the screw is screwed into the threaded hole of the shielding tail cover. The observation window pressure plate is tightened evenly in a symmetrical, cross-sectional order, thus completing the sealing of the stator shielding cover's shielding tail cover.

[0036] In another possible embodiment, after the stator core is installed into the motor housing, the stator core is fixed to the motor housing; the stator shield is inserted into the stator core. The shielding end cap of the stator shield fits into the tail end of the motor housing, and the shielding end cap of the stator shield fits into the motor mounting flange surface.

[0037] Another possible embodiment involves a connecting shaft on the vacuum pump, with a rotor structure fixedly mounted on the extended end of the connecting shaft. The motor, along with the stator shield, is fitted onto the extended rotor mechanism of the vacuum pump, ensuring that the stator core and rotor are aligned. The motor is then fixedly connected to the end face of the vacuum pump via its own flange.

[0038] Another possible embodiment is to open a sealing groove on the vacuum pump flange during motor installation. This sealing groove is set in correspondence with the sealing groove of the shield end cover. The sealing groove is filled with sealing material, which can realize the isolation and sealing of the inner cavity formed by the rotor and stator shield from the outside.

[0039] Another possible embodiment, in which the shielding sleeve is made of stainless steel and has a thin wall thickness, requires care to prevent deformation of the shielding sleeve during welding.

[0040] This invention enables real-time fault monitoring. Through the observation window 7, it allows direct observation of rotor operation for jamming or eccentricity, as well as bearing lubrication status, enabling timely detection of abnormalities such as sparks and cracks in the shielding sleeve 601, thus improving fault early warning capabilities. Furthermore, it optimizes vacuum sealing, achieving triple sealing: firstly, the shielding sleeve 601 is circumferentially welded to the end cover 602 and tail cover 603 for sealing; secondly, the observation window assembly is compressed and sealed by the sealing ring 9 and the pressure plate 7; finally, the mating surface between the shielding end cover 602 and the vacuum pump flange is sealed (sealing groove two). This ensures long-term stable operation of the motor under a certain vacuum environment. Moreover, the observation window assembly can be quickly disassembled and assembled (M5 screws are tightened in a cross pattern), facilitating replacement or cleaning. The thin-walled shielding sleeve 601 is made of non-magnetic material, reducing eddy current losses.

[0041] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A vacuum shielded motor housing with an observation window, comprising a motor housing (1), a stator assembly (2) disposed within the motor housing (1), and a rotor assembly (3) rotatably disposed inside the stator assembly (2), characterized in that: A stator shield (6) is added between the rotor assembly (3) and the stator assembly (2). The stator shield (6) includes a cylindrical shield (601) coaxially disposed around the rotor assembly (3) and passing through the inner cavity of the stator assembly (2). A shield end cap (602) is provided at the front end of the cylindrical shield (601), and the shield end cap (602) is provided with a central hole (605) for the rotor shaft to pass through. A shield tail cap (603) is provided at the rear end of the cylindrical shield (601), and the shield tail cap (603) is provided with an observation window assembly. The shielding end cap (602) and the shielding tail cap (603) are respectively sealed to the motor housing (1), and the cylindrical shielding sleeve (601) forms a first annular gap with the rotor assembly (3) and a second annular gap with the inner wall of the stator assembly (2).

2. The motor housing according to claim 1, characterized in that: The observation window assembly includes an observation hole (604) on the shielding tail cover (603), an observation window (8) covering the observation hole (604), and an annular pressure plate (7) fixed to the shielding tail cover (603) by evenly distributed fasteners. The inner diameter of the pressure plate (7) is smaller than the outer diameter of the observation window (8) so that the observation window (8) is partially exposed.

3. The motor housing according to claim 2, characterized in that: The mounting end face of the shielding tail cover (603) is provided with an annular sealing groove (607), and a sealing ring (9) is embedded in the sealing groove (607) to achieve static sealing between the observation window (8) and the shielding tail cover (603).

4. The motor housing according to claim 2, characterized in that: The pressure plate (7) is fixed by evenly distributed screws, and is tightened symmetrically in a cross pattern during installation.

5. The motor housing according to claim 1, characterized in that: The end face of the shielding end cap (602) is provided with a sealing groove (606) for sealing with the vacuum pump flange.

6. The motor housing according to claim 1, characterized in that: The width of the first annular gap is 1-3 mm, and the width of the second annular gap is 0.5-2 mm.

7. The motor housing according to claim 1, characterized in that: The shielding sleeve (601) is sealed to the shielding end cap (602) and the shielding tail cap (603) by circumferential welding.

8. The vacuum shielded motor housing according to claim 1, characterized in that: The shielding sleeve (601) is made of thin-walled non-magnetic metal with a wall thickness of 1.5mm-3mm.

9. The vacuum shielded motor housing according to claim 2 or 3, characterized in that: The observation window (8) is made of borosilicate glass or quartz glass, and the material selection is determined according to the vacuum level of the working environment.

10. The vacuum shielded motor housing according to claim 4, characterized in that: The fasteners of the pressure plate (7) are four M5 hex socket screws. The mounting holes of the four M5 hex socket screws are evenly distributed at 90° on the shielding tail cover (603), and they are tightened to the rated torque in stages in diagonal order during installation.

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