Vacuum sealing structure of motor

Abstract

The utility model relates to the technical field of motor shaft sealing, in particular to a motor vacuum sealing structure which comprises a motor shaft and a mounting plate, a shaft hole for the motor shaft to penetrate through is formed in the mounting plate, a bearing ring seat coaxial with the axis of the shaft hole is arranged on the mounting plate, and the motor shaft rotationally penetrates through the bearing ring seat. A fixed sealing assembly is arranged between the bearing ring seat and the mounting plate, the fixed sealing assembly is used for fixing the bearing ring seat and sealing the bearing ring seat on the mounting plate, the motor shaft is coaxially sleeved with a ball bearing, the bearing ring seat is provided with a bearing groove used for containing the ball bearing, and an elastic sealing piece is arranged between the bearing ring seat and the motor shaft; and the elastic sealing element is used for sealing the motor shaft in a rotating state. The motor shaft has the effect of improving the sealing performance between the motor shaft and the mounting plate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor shaft sealing, in particular to a motor vacuum sealing structure. BACKGROUND

[0002] A freeze dryer is a device for removing water from an object by using vacuum freeze drying technology, and is widely used in the fields of food, medicine, biological products and the like. The working principle of the freeze dryer is based on the three-state change of water. Water in the material is frozen into ice crystals by low temperature, and then the ice crystals are directly sublimated into water vapor in a vacuum environment, so that the drying purpose is achieved.

[0003] Since the processing process is in a low-temperature and vacuum environment, a conveying mechanism is usually used to realize the continuous processing process of the object. The conveying mechanism usually uses a motor as a driving source. Due to the limitation of the low-temperature and vacuum environment, the motor is usually arranged outside the body of the freeze dryer, and the motor shaft rotates into the inside of the freeze dryer. Therefore, the diameter of the hole for the motor shaft to pass through on the freeze dryer shell is usually larger than the diameter of the motor shaft. The inside of the freeze dryer needs to maintain a vacuum environment. The traditional solution is to arrange an annular sealing ring between the motor shaft and the body of the freeze dryer.

[0004] Since the motor will vibrate when working, the vibration will be transmitted to the motor shaft, causing the motor shaft to vibrate. The vibration of the motor shaft will press the annular sealing ring to one side, causing a gap on the side of the annular sealing ring opposite to the vibration direction of the motor shaft, thereby causing the vacuum effect in the freeze dryer to be poor. CONTENT OF THE INVENTION

[0005] In order to improve the problem that the vibration of the motor shaft causes the vacuum effect in the freeze dryer to be poor, the application provides a motor vacuum sealing structure.

[0006] The motor vacuum sealing structure provided by the application adopts the following technical scheme:

[0007] A motor vacuum sealing structure, comprising a motor shaft and a mounting plate, the mounting plate is provided with a shaft hole for the motor shaft to pass through, the mounting plate is provided with a bearing ring seat coaxial with the axis of the shaft hole, the motor shaft rotates through the bearing ring seat, a fixed sealing assembly is arranged between the bearing ring seat and the mounting plate, the fixed sealing assembly is used to fix and seal the bearing ring seat on the mounting plate, a ball bearing is coaxially sleeved on the motor shaft, a bearing groove for accommodating the ball bearing is arranged on the bearing ring seat, and an elastic sealing piece is arranged between the bearing ring seat and the motor shaft, the elastic sealing piece is used to seal the motor shaft in a rotating state.

[0008] By adopting the above technical solution, the fixed sealing assembly fixes and seals the bearing ring seat on the mounting plate. When the motor shaft rotates, the ball bearing supports the motor shaft and reduces friction. When the motor shaft rotates and vibrates, the elastic seal always seals the space between the motor shaft and the mounting plate, thereby maintaining the vacuum state inside the freeze dryer.

[0009] Optionally, the elastic seal includes a sealing ring plate coaxially disposed on the bearing ring seat, the inner circumferential sidewall of the sealing ring plate abutting against the outer circumferential sidewall of the motor shaft, the sealing ring plate being located between the mounting plate and the ball bearing, a deformation ring groove being coaxially formed on the side of the sealing ring plate facing away from the mounting plate, and a micro-variation ring groove being coaxially formed on the inner ring sidewall of the sealing ring plate.

[0010] By adopting the above technical solution, when the motor shaft vibrates, the vibrating motor shaft will squeeze the sealing ring. Due to the slight change in the ring groove and the deformation ring groove, the cross-section of the sealing ring changes significantly, resulting in different degrees of deformation on the side of the sealing ring closer to the mounting plate and the side farther from the mounting plate. Moreover, the amplitude of the motor shaft vibration only causes a gap to be created on the side of the sealing ring closer to the mounting plate, while the sealing ring on the side farther from the mounting plate will always abut against the circumferential outer wall of the motor shaft, thereby ensuring the sealing between the mounting plate and the motor shaft.

[0011] Optionally, the fixed sealing assembly includes a sealing and fixing ring plate disposed on the mounting plate, a fixing member is disposed between the sealing and fixing ring plate and the bearing ring seat, the fixing member is used to fix the bearing ring seat on the sealing and fixing ring plate, a primary sealing ring is disposed between the bearing ring seat and the mounting plate, and a sealing groove for accommodating the primary sealing ring is coaxially formed on the bearing ring seat.

[0012] By adopting the above technical solution, during the process of workers fixing the bearing ring seat to the sealing ring plate with fasteners, the primary sealing ring is compressed and seals the bearing ring seat and the mounting plate, thereby reducing the possibility of outside air flowing through the gap between the bearing ring seat and the mounting plate.

[0013] Optionally, the fastener includes a plurality of fixing bolts threaded to the sealing fixing ring plate, and the bearing ring seat has a plurality of countersunk holes through which the fixing bolts pass, with each fixing bolt corresponding to one of the countersunk holes.

[0014] By adopting the above technical solution, the workers first weld the sealing ring plate onto the mounting plate, and then fix the bearing ring seat onto the sealing ring plate with fixing bolts. The bolted connection facilitates future maintenance.

[0015] Optionally, a clamping ring plate is coaxially disposed on the bearing ring seat on the side of the sealing ring facing the ball bearing, and the clamping ring plate is used to press against the sealing ring.

[0016] By adopting the above technical solution, during the process of workers tightening the fixing bolts, the pressure ring plate continuously squeezes the sealing ring plate along the axial direction of the motor shaft, causing the sealing ring plate to deform continuously in the radial direction along the motor shaft axis, thereby making the sealing ring plate tightly attached to the circumferential outer wall of the motor shaft, thus achieving a sealing effect.

[0017] Optionally, the bearing ring seat is provided with a retaining ring for the bore, the retaining ring for the bore being located on the side of the ball bearing facing away from the mounting plate.

[0018] By adopting the above technical solution, the possibility of the ball bearing accidentally detaching from the bearing ring seat is reduced.

[0019] Optionally, a convex ring is coaxially provided on the motor shaft, and the convex ring is used to abut against the ball bearing.

[0020] By adopting the above technical solution, the displacement of the ball bearing in the axial direction is reduced, and the ball bearing is always subjected to the load in the radial direction of the motor shaft.

[0021] Optionally, the clamping ring plate and the bearing ring seat are integrally formed.

[0022] By adopting the above technical solutions, it is beneficial to reduce processing difficulty and cost.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The fixed sealing assembly fixes and seals the bearing ring seat on the mounting plate. When the motor shaft rotates, the ball bearing supports the motor shaft and reduces friction. When the motor shaft rotates and vibrates, the elastic seal always seals the space between the motor shaft and the mounting plate to maintain the vacuum state inside the freeze dryer.

[0025] 2. When the motor shaft vibrates, the vibrating motor shaft will squeeze the sealing ring. Due to the slight change in the ring groove and the deformation ring groove, the cross-section of the sealing ring changes significantly. This causes the side of the sealing ring closer to the mounting plate and the side farther from the mounting plate to deform to different degrees. The amplitude of the motor shaft vibration only creates a gap on the side of the sealing ring closer to the mounting plate, while the sealing ring on the side farther from the mounting plate will always abut against the outer circumferential wall of the motor shaft, thus ensuring the sealing between the mounting plate and the motor shaft.

[0026] 3. During the process of tightening the fixing bolts, the clamping ring plate continuously squeezes the sealing ring along the axial direction of the motor shaft, causing the sealing ring to deform continuously in the radial direction along the motor shaft axis, thereby making the sealing ring tightly adhere to the circumferential outer wall of the motor shaft, thus achieving a sealing effect. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0028] Figure 2 This is a cross-sectional view in the embodiments of this application used to illustrate the positional relationship between the sealing ring, the clamping ring plate, and the ball bearing.

[0029] Explanation of reference numerals in the attached drawings: 1. Motor shaft; 2. Mounting plate; 3. Shaft hole; 4. Bearing ring seat; 5. Fixed sealing assembly; 51. Sealing fixing ring plate; 52. Fixing element; 521. Fixing bolt; 522. Countersunk hole; 53. Primary sealing ring; 54. Sealing groove; 6. Ball bearing; 7. Bearing groove; 8. Elastic seal; 81. Sealing ring plate; 82. Deformable ring groove; 83. Micro-deformation ring groove; 9. Pressing ring plate; 10. Elastic retaining ring for the hole; 11. Raised ring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0031] This application discloses a vacuum sealing structure for an electric motor.

[0032] Reference Figure 1 A vacuum sealing structure for an electric motor includes a motor shaft 1 and a mounting plate 2. The mounting plate 2 has a shaft hole 3 through which the motor shaft 1 passes. A bearing ring seat 4 coaxial with the axis of the shaft hole 3 is arranged on the mounting plate 2. The motor shaft 1 rotates through the bearing ring seat 4. A ball bearing 6 is coaxially sleeved on the motor shaft 1.

[0033] Reference Figure 1 and Figure 2 The bearing ring seat 4 has a bearing groove 7 for accommodating the ball bearing 6. A retaining ring 10 for the hole is snapped onto the bearing ring seat 4. The retaining ring 10 for the hole is located on the side of the ball bearing 6 facing away from the mounting plate 2. The retaining ring 10 for the hole is used to abut against the outer ring of the ball bearing 6. A convex ring 11 is integrally formed on the motor shaft 1. The convex ring 11 is used to abut against the inner ring of the ball bearing 6.

[0034] Reference Figure 1 and Figure 2An elastic seal 8 is arranged between the bearing ring seat 4 and the motor shaft 1. The elastic seal 8 is used to seal the motor shaft 1 in the rotating state. A fixed sealing assembly 5 is arranged between the bearing ring seat 4 and the mounting plate 2. The fixed sealing assembly 5 is used to fix and seal the bearing ring seat 4 on the mounting plate 2.

[0035] Reference Figure 1 and Figure 2 The elastic seal 8 includes a sealing ring 81 coaxially arranged on the bearing ring seat 4. The sealing ring 81 may be made of rubber material. The inner circumferential sidewall of the sealing ring 81 abuts against the outer circumferential sidewall of the motor shaft 1. The sealing ring 81 is located between the mounting plate 2 and the ball bearing 6. A clamping ring 9 is coaxially integrally formed inside the bearing ring seat 4.

[0036] Reference Figure 1 and Figure 2 The clamping ring plate 9 is used to press against the sealing ring plate 81. The sealing ring plate 81 has a deformable ring groove 82 coaxially opened on the side facing away from the mounting plate 2. The inner ring side wall of the sealing ring plate 81 has a micro-variable ring groove 83 coaxially opened. The clamping ring plate 9 is located on the side of the sealing ring plate 81 facing the ball bearing 6. The inner diameter of the clamping ring plate 9 is larger than the inner diameter of the deformable ring groove 82.

[0037] Reference Figure 1 and Figure 2 The fixed sealing assembly 5 includes a sealing and fixing ring plate 51 welded to the mounting plate 2. A fixing member 52 is arranged between the sealing and fixing ring plate 51 and the bearing ring seat 4. The fixing member 52 is used to fix the bearing ring seat 4 on the sealing and fixing ring plate 51. The fixing member 52 includes a plurality of fixing bolts 521 threadedly connected to the sealing and fixing ring plate 51. The fixing bolts 521 can be countersunk bolts in the prior art.

[0038] Reference Figure 1 and Figure 2 The bearing ring seat 4 has multiple countersunk holes 522 for the fixing bolts 521 to pass through. The fixing bolts 521 correspond one-to-one with the countersunk holes 522. A primary sealing ring 53 is arranged between the bearing ring seat 4 and the mounting plate 2. A sealing groove 54 for accommodating the primary sealing ring 53 is coaxially provided on the bearing ring seat 4.

[0039] The worker first welds the sealing ring plate 51 onto the mounting plate 2, and then fixes the bearing ring seat 4 onto the sealing ring plate 51 with the fixing bolts 521. During the process of the worker tightening the fixing bolts 521, the primary sealing ring 53 continuously deforms, thereby achieving a seal between the bearing ring seat 4 and the mounting plate 2. At the same time, the pressing ring plate 9 and the mounting plate 2 continuously squeeze the sealing ring plate 81.

[0040] The sealing ring 81 deforms continuously along the radial direction of the motor shaft 1, so that the inner ring sidewall of the sealing ring 81 always presses against the outer circumferential sidewall of the motor shaft 1. When the motor shaft 1 rotates and vibrates, the cross-section of the sealing ring 81 changes due to the deformation ring groove 82 and the micro-deformation ring groove 83, resulting in different degrees of deformation on the side of the sealing ring 81 closer to the mounting plate 2 and the side farther away from the mounting plate 2.

[0041] Since the vibration amplitude of the motor shaft 1 is usually not very large, the vibration amplitude of the motor shaft 1 only causes a gap to be created on the side of the sealing ring 81 close to the mounting plate 2, while the sealing ring 81 on the side away from the mounting plate 2 will always abut against the circumferential outer wall of the motor shaft 1, thereby ensuring the sealing between the mounting plate 2 and the motor shaft 1.

[0042] The implementation principle of the motor vacuum sealing structure in this application embodiment is as follows: the worker first welds the sealing fixing ring plate 51 onto the mounting plate 2, and then fixes the bearing ring seat 4 onto the sealing fixing ring plate 51 by fixing bolts 521. During the process of the worker tightening the fixing bolts 521, the primary sealing ring 53 continuously deforms, thereby achieving a seal between the bearing ring seat 4 and the mounting plate 2. At the same time, the pressing ring plate 9 and the mounting plate 2 continuously squeeze the sealing ring piece 81.

[0043] The sealing ring 81 deforms continuously along the radial direction of the motor shaft 1, so that the inner ring sidewall of the sealing ring 81 always presses against the outer circumferential sidewall of the motor shaft 1. When the motor shaft 1 rotates and vibrates, the cross-section of the sealing ring 81 changes due to the deformation ring groove 82 and the micro-deformation ring groove 83, resulting in different degrees of deformation on the side of the sealing ring 81 closer to the mounting plate 2 and the side farther away from the mounting plate 2.

[0044] Since the vibration amplitude of the motor shaft 1 is usually not very large, the vibration amplitude of the motor shaft 1 only causes a gap to be created on the side of the sealing ring 81 close to the mounting plate 2, while the sealing ring 81 on the side away from the mounting plate 2 will always abut against the circumferential outer wall of the motor shaft 1, thereby ensuring the sealing between the mounting plate 2 and the motor shaft 1.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vacuum sealing structure for an electric motor, characterized in that: The assembly includes a motor shaft (1) and a mounting plate (2). The mounting plate (2) has a shaft hole (3) through which the motor shaft (1) passes. The mounting plate (2) has a bearing ring seat (4) coaxial with the axis of the shaft hole (3). The motor shaft (1) rotates through the bearing ring seat (4). A fixing sealing assembly (5) is provided between the bearing ring seat (4) and the mounting plate (2). The fixing sealing assembly (5) is used to fix and seal the bearing ring seat (4) on the mounting plate (2). A ball bearing (6) is coaxially sleeved on the motor shaft (1). The bearing ring seat (4) has a bearing groove (7) for accommodating the ball bearing (6). An elastic seal (8) is provided between the bearing ring seat (4) and the motor shaft (1). The elastic seal (8) is used to seal the motor shaft (1) in the rotating state.

2. The vacuum sealing structure for an electric motor according to claim 1, characterized in that: The elastic seal (8) includes a sealing ring (81) coaxially disposed on the bearing ring seat (4). The inner circumferential sidewall of the sealing ring (81) abuts against the outer circumferential sidewall of the motor shaft (1). The sealing ring (81) is located between the mounting plate (2) and the ball bearing (6). A deformation ring groove (82) is coaxially formed on the side of the sealing ring (81) facing away from the mounting plate (2). A micro-variation ring groove (83) is coaxially formed on the inner ring sidewall of the sealing ring (81).

3. The vacuum sealing structure for an electric motor according to claim 2, characterized in that: The fixed sealing assembly (5) includes a sealing and fixing ring plate (51) disposed on the mounting plate (2). A fixing member (52) is disposed between the sealing and fixing ring plate (51) and the bearing ring seat (4). The fixing member (52) is used to fix the bearing ring seat (4) on the sealing and fixing ring plate (51). A primary sealing ring (53) is disposed between the bearing ring seat (4) and the mounting plate (2). A sealing groove (54) for accommodating the primary sealing ring (53) is coaxially opened on the bearing ring seat (4).

4. The vacuum sealing structure for an electric motor according to claim 3, characterized in that: The fastener (52) includes a plurality of fastening bolts (521) threaded onto the sealing and fixing ring plate (51). The bearing ring seat (4) has a plurality of countersunk holes (522) through which the fastening bolts (521) pass. The fastening bolts (521) correspond one-to-one with the countersunk holes (522).

5. The vacuum sealing structure for an electric motor according to claim 4, characterized in that: A clamping ring plate (9) is coaxially disposed on the bearing ring seat (4) on the side of the sealing ring plate (81) facing the ball bearing (6), and the clamping ring plate (9) is used to press against the sealing ring plate (81).

6. The vacuum sealing structure for an electric motor according to claim 1, characterized in that: The bearing ring seat (4) is provided with a hole elastic retaining ring (10), which is located on the side of the ball bearing (6) facing away from the mounting plate (2).

7. The vacuum sealing structure for an electric motor according to claim 1, characterized in that: A convex ring (11) is coaxially provided on the motor shaft (1), and the convex ring (11) is used to abut against the ball bearing (6).

8. The vacuum sealing structure for an electric motor according to claim 5, characterized in that: The clamping ring plate (9) and the bearing ring seat (4) are integrally formed and arranged.

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