CN211692935U

CN211692935U - Locking structure for fixing molecular pump bearing

Info

Publication number: CN211692935U
Application number: CN202020162328.4U
Authority: CN
Inventors: 刘炯; 王宁
Original assignee: Kyky Technology Co ltd
Current assignee: KYKY TECHNOLOGY Co.,Ltd.; Suzhou Zhongke Keyi Technology Development Co.,Ltd.
Priority date: 2020-02-11
Filing date: 2020-02-11
Publication date: 2020-10-16
Anticipated expiration: 2030-02-11

Abstract

The utility model discloses a fixed locking structure of molecular pump bearing relates to the fixed technical field of molecular pump bearing, include: a main shaft; a bearing sleeved on the main shaft; and the fastener is arranged at one end of the main shaft, which is provided with the bearing. The fastener is close to the first terminal surface butt of the first terminal surface of bearing and the inner circle of bearing to exert the pretightning force to the inner circle of bearing, make the main shaft at high-speed rotation in-process, the bearing of cover dress on the main shaft can keep the inner circle to rotate steadily at preset position, solved the bearing and fixed insecure problem in the axial direction. The utility model provides a molecular pump bearing axial fixity's firm locking structure of molecular pump bearing.

Description

Locking structure for fixing molecular pump bearing

Technical Field

The utility model relates to a fixed technical field of molecular pump bearing, concretely relates to fixed locking structure of molecular pump bearing.

Background

The molecular pump is a common vacuum obtaining device, a cavity is formed in the molecular pump, a high-speed motor is installed in the cavity, and when the molecular pump works, a rotor rotating at a high speed compresses gas molecules in the cavity and enables the gas molecules to obtain a directional speed to be discharged to an exhaust port.

Among the prior art, the molecular pump bearing is often installed in the molecular pump bearing frame, because the molecular pump can produce great vibration to the bearing at high-speed rotatory in-process, in order to reduce the influence that the bearing vibration brought among the prior art, generally set up shock attenuation rubber ring or other shock attenuation non-metallic material between bearing and bearing frame, but inevitable has certain clearance between bearing and bearing frame, lead to the bearing to be fixed insecure at the axial direction of pivot, the bearing can produce axial displacement at the vibration in-process, lead to the bearing life to shorten, also influence the life of equipment.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the insecure defect of molecular pump bearing axial fixity among the prior art to a molecular pump bearing fixed locking structure is provided.

In order to solve the technical problem, the utility model provides a fixed locking structure of molecular pump bearing, include:

a main shaft; the bearing is sleeved on the main shaft; the fastening piece is installed at one end, provided with the bearing, of the main shaft, and the first end face of the fastening piece is abutted to the first end face of the inner ring of the bearing and applies pretightening force to the inner ring of the bearing.

The main shaft is installed the one end of bearing is equipped with first installation department and second installation department in proper order, first installation department with the inner circle clearance fit of bearing, the second installation department with fastener screw-thread fit.

The inside shaping of fastener have with the through-hole of second installation department adaptation, the through-hole inner wall is equipped with the internal thread, second installation department surface is equipped with the external screw thread.

And a thread tool withdrawal groove is formed between the second mounting part and the first mounting part.

And a notch is formed on the second end face of the fastener, which is far away from the bearing.

The opening is in a shape of a straight line.

The bearing is installed in the bearing groove of the bearing seat, and the end face, far away from the fastening piece, of the outer ring of the bearing is abutted to the end face of the main shaft.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a fixed locking structure of molecular pump bearing, the bearing housing is established on the main shaft, the one end that the main shaft is equipped with the bearing is installed to the fastener, and the first terminal surface butt of the first terminal surface of fastener and the inner circle of bearing to exert the pretightning force to the inner circle of bearing, guarantee at the high-speed operation in-process of molecular pump main shaft, the bearing does not take place the skew vibration in the main shaft axial, has guaranteed bearing pivoted stability, has prolonged the life of bearing, thereby the life of molecular pump has been improved.

2. The utility model provides a fixed locking structure of molecular pump bearing, the one end that the bearing was installed to the main shaft is equipped with first installation department and second installation department in proper order, the inner circle clearance fit of first installation department and bearing, the inside shaping of fastener have with the through-hole of second installation department adaptation, the through-hole inner wall is equipped with the internal thread, second installation department surface is equipped with the external screw thread, can be fixed on the axial direction through the fastener of screwing through screw thread fit with first installation department clearance fit's bearing, also convenient to detach.

3. The utility model provides a locking structure that molecular pump bearing is fixed, the shaping has the screw thread tool withdrawal groove between second installation department and the first installation department, is convenient for process the external screw thread on the second installation department in the manufacturing process in earlier stage.

4. The utility model provides a locking structure that molecular pump bearing is fixed, the shaping has "one" style of calligraphy opening on the second terminal surface that the bearing was kept away from to the fastener, and the rotating fastening spare of can being convenient for is installed or is dismantled it.

5. The utility model provides a locking structure that molecular pump bearing is fixed, bearing installation are in the bearing groove of bearing frame, and the terminal surface and the main shaft terminal surface butt of fastener are kept away from to the bearing inner race, guarantee that the one end that the fastener was kept away from to the bearing also can not take place the displacement in the axial fixedly.

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 embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a locking structure for fixing a molecular pump bearing according to the present invention;

fig. 2 is an exploded view of the locking structure for fixing the molecular pump bearing of the present invention;

FIG. 3 is a schematic structural view of the fastener of the present invention;

description of reference numerals:

1. opening the gap; 2. a fastener; 3. an inner ring; 4. a bearing; 5. a second mounting portion; 6. a first mounting portion; 7. a main shaft; 8. a tool withdrawal groove; 9. the end surface of the main shaft.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to 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", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Fig. 1-3 are a specific embodiment of the locking structure for fixing the bearing of the molecular pump provided by the present invention, which includes:

a main shaft 7; a bearing 4 sleeved on the main shaft 7; a fastener 2 is mounted at the end of the main shaft 7 where the bearing 4 is located.

As shown in fig. 1-2, the bottom surface of the fastening member 2 abuts against the top surface of the inner ring 3 of the bearing 4, and applies a downward pre-tightening force to the inner ring 3 of the bearing 4, so that the bearing 4 sleeved on the main shaft 7 can keep the inner ring 3 to stably rotate at a predetermined position in the process of high-speed rotation of the main shaft 7, the problem that the service life of the bearing 4 is shortened due to axial displacement of the bearing 4 is avoided, and the service lives of the bearing 4 and the molecular pump in which the bearing is located are prolonged.

Specifically, one end of the main shaft 7, which is provided with the bearing 4, is sequentially provided with a first installation part 6 and a second installation part 5, and the first installation part 6 and the second installation part 5 are circular rings with outer diameters smaller than the diameter of the main shaft 7 and are respectively matched with the inner diameter of the inner ring 3 of the bearing 4 and the inner threads of the fastening piece 2. The inner ring 3 of the bearing 4 is sleeved on the first mounting part 6 and is in clearance fit with the first mounting part 6, and the first mounting part 6 is used for preliminarily fixing the bearing 4.

Fastener 2 is established to the cover for second installation department 5, for making manufacturing process simple to be convenient for installation, dismantle fastener 2, second installation department 5 chooses for use screw-thread fit with fastener 2, have the through-hole with 5 adaptations of second installation department in 2 inside shaping of fastener, and the through-hole inner wall is equipped with the internal thread, and 5 surfaces of second installation department are equipped with the external screw thread. As shown in fig. 3, a "i" shaped notch is formed on a second end surface of the fastening member 2 away from the bearing 4, so that the fastening member 2 can be conveniently rotated to be mounted or dismounted, and the outer diameter of the fastening member 2 does not exceed the outer diameter of the inner ring 3 of the bearing 4. Rotating the fastener 2 so that its bottom surface abuts against the inner ring 3 of the bearing 4 causes the fastener 2 to fix the upper end of the bearing 4 in the axial direction.

To facilitate the machining of the external threads on the second mounting portion during the pre-fabrication process, a thread relief groove 8 is formed between the second mounting portion 5 and the first mounting portion 6.

Bearing 4 installs in the bearing groove of bearing frame, and fastener 2's terminal surface and main shaft terminal surface 9 butt are kept away from to bearing 4's outer lane, have guaranteed that bearing 4's lower extreme is fixed to bearing 4 has all been fixed in axial direction both sides, has guaranteed bearing 4's stability.

When using, bearing 4 and fastener 2 overlap respectively and establish on first installation department 6 and the second installation department 5 that sets gradually on main shaft 7, bearing 4 inner circle 3 adopts clearance fit with first installation department 6, fastener 2 adopts threaded connection with second installation department 5, bearing 4 installs in the bearing groove of bearing frame, bearing 4's outer lane bottom and 9 butts of main shaft terminal surface, bearing 4's inner circle top and fastener 2 butts, then bearing 4 is fixed in the axial, avoided molecular pump main shaft 7 to rotate the in-process bearing 4 at high speed at the ascending skew wearing and tearing of axial, the life of bearing 4 and molecular pump has been prolonged.

As an alternative embodiment, the notch formed in the second end face of the fastener 2 remote from the bearing 4 may be provided with a cross.

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 can be made without departing from the scope of the invention.

Claims

1. A locking structure for fixing a molecular pump bearing comprises:

a main shaft (7);

the bearing (4) is sleeved on the main shaft (7);

the fastening piece (2) is installed at one end, provided with the bearing (4), of the main shaft (7), and a first end face of the fastening piece (2) is abutted to a first end face of the inner ring (3) of the bearing (4) and applies pretightening force to the inner ring (3) of the bearing (4).

2. The molecular pump bearing fixing locking structure according to claim 1, wherein one end of the main shaft (7) where the bearing (4) is installed is sequentially provided with a first installation part (6) and a second installation part (5), the first installation part (6) is in clearance fit with the inner ring (3) of the bearing (4), and the second installation part (5) is in threaded fit with the fastener (2).

3. The locking structure for fixing the bearing of the molecular pump according to claim 2, wherein a through hole matched with the second mounting part (5) is formed in the fastener (2), the inner wall of the through hole is provided with internal threads, and the surface of the second mounting part (5) is provided with external threads.

4. The locking structure for fixing a molecular pump bearing according to claim 2, characterized in that a thread relief groove (8) is formed between the second mounting part (5) and the first mounting part (6).

5. The molecular pump bearing fixing locking structure according to any one of claims 1 to 4, wherein a notch is formed on a second end face of the fastening member (2) far away from the bearing (4).

6. The molecular pump bearing securing lock structure according to claim 5, wherein the notch is in the shape of a straight line.

7. A locking structure for fixing a molecular pump bearing according to any one of claims 1-4, characterized in that the bearing (4) is mounted in a bearing groove of a bearing seat, and the end surface of the outer ring of the bearing (4) far away from the fastening member (2) is abutted with the end surface (9) of the main shaft.