Vertical motor and bearing oil mist sealing device thereof

Abstract

The application discloses a bearing oil mist sealing device for a vertical motor, and relates to the technical field of motors, which comprises a positive pressure fan assembly arranged on a motor shaft and located in a motor stator cavity; the positive pressure fan assembly comprises fan blades which are plate-shaped structures extending along the axial direction of the motor shaft and are arranged in an inclined manner with the radial plane of the motor shaft; the inclined direction is such that the fan blades can apply an axial force to air when the motor shaft rotates, so as to generate an air flow from the motor shaft to a bearing oil tank, thereby preventing oil mist in the bearing oil tank from entering the motor stator cavity and avoiding pollution of the stator winding by the oil mist, and ensuring safe operation of the vertical motor. The application further discloses a vertical motor comprising a vertical motor body and the bearing oil mist sealing device for the vertical motor, wherein the bearing oil mist sealing device for the vertical motor is arranged on the motor shaft of the vertical motor body.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a vertical motor and its bearing oil mist sealing device. Background Technology

[0002] Vertical motors using thin oil lubrication, such as Figure 1 As shown, the thrust bearing that bears the weight of the rotor is equipped with a bearing oil tank 02 that stores lubricating oil 01. It is generally installed at the top of the motor. The motor shaft 03 passes through the oil baffle pipe 04 in the center of the bearing oil tank 02 and is installed as a whole with the thrust head 05. Below the bearing oil tank 02 are the motor stator and rotor. Due to the need for ventilation and cooling, a rotor fan 06 is generally installed on the rotor, and a wind baffle ring 08 is installed at the end of the stator winding 07.

[0003] When the motor is working, the bearing 09 generates heat due to rotation, which raises the temperature of the lubricating oil 01 and produces oil mist. Some of the oil mist will enter the vent hole 010 due to the negative pressure formed by the rotor fan 06, and enter the stator cavity 012 of the motor along the gap between the oil baffle tube 04 and the motor shaft 03 (i.e., the oil baffle tube cavity 011), contaminating the stator winding 07. In severe cases, it can cause insulation failure and a pressure failure accident.

[0004] It is evident that preventing oil mist from the bearing oil tank from entering the motor stator cavity and contaminating the stator windings is a problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a vertical motor and its bearing oil mist sealing device to solve the problems existing in the prior art, and to prevent oil mist in the bearing oil tank from entering the motor stator cavity and avoid oil mist contamination of the stator winding.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a bearing oil mist sealing device for a vertical motor, comprising: A positive pressure fan assembly is used to mount on the motor shaft and is located within the motor stator cavity; The positive pressure fan assembly includes fan blades, which are plate-shaped structures extending axially along the motor shaft. The fan blades are inclined to the radial plane of the motor shaft, and the inclination direction allows the fan blades to apply an axial force along the motor shaft when rotating with the motor shaft, thereby generating airflow from the motor shaft to the bearing oil tank, thus preventing oil mist in the bearing oil tank from entering the motor stator cavity.

[0007] Preferably, the positive pressure fan assembly further includes: A fan mount is used to fix it onto the motor shaft; the fan blades are disposed on the fan mount.

[0008] Preferably, the fan base is an annular structure; the fan blades are fixed to the outer annular surface of the fan base.

[0009] Preferably, there are multiple fan blades, and all the fan blades are evenly distributed on the outer ring surface of the fan base.

[0010] Preferably, the positive pressure fan assembly further includes: A windbreak is provided on the fan blade to prevent airflow along the motor shaft from being generated when the fan blade rotates.

[0011] Preferably, the windproof part is a windproof ring, which is sleeved on the outside of each of the fan blades.

[0012] Preferably, the inner wall of the wind deflector ring is fixedly connected to the end of each of the fan blades.

[0013] Preferably, the fan blade is an arc-shaped plate, and the concave surface of the fan blade is oriented towards the rotation direction of the motor shaft.

[0014] The present invention also provides a vertical motor, including a vertical motor body and the above-mentioned bearing oil mist sealing device for the vertical motor, wherein the bearing oil mist sealing device for the vertical motor is installed on the motor shaft of the vertical motor body.

[0015] Preferably, the bearing oil mist sealing device for the vertical motor is interference-fitted with the motor shaft of the vertical motor body.

[0016] The present invention achieves the following technical effects compared to the prior art: The present invention provides a bearing oil mist sealing device for a vertical motor, comprising a positive pressure fan assembly. The positive pressure fan assembly includes fan blades, which are plate-shaped structures extending axially along the motor shaft and are inclined to the radial plane of the motor shaft. By rotating with the motor shaft, the fan blades generate airflow from the motor shaft to the bearing oil tank, thereby regulating the pressure in the oil-blocking pipe cavity that connects the bearing oil tank and the motor stator cavity. This makes the pressure in the oil-blocking pipe cavity greater than the pressure in the bearing oil tank, thus counteracting the negative pressure in the motor stator cavity and preventing oil mist from entering the motor stator cavity. This avoids oil mist contamination of the stator windings and ensures the safe operation of the vertical motor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a vertical motor that uses thin oil lubrication.

[0019] Figure 1 In the middle: 01-Lubricating oil, 02-Bearing oil tank, 03-Motor shaft, 04-Oil baffle pipe, 05-Thrust head, 06-Rotor fan, 07-Stator winding, 08-Wind baffle ring, 09-Bearing, 010-Ventil hole, 011-Oil baffle pipe cavity, 012-Motor stator cavity.

[0020] Figure 2 A schematic diagram of a bearing oil mist sealing device for a vertical motor provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the working state of the bearing oil mist sealing device for a vertical motor provided in an embodiment of the present invention.

[0021] Figures 2-3 In the middle: 100-positive pressure fan assembly, 101-fan base, 102-fan blade, 103-wind baffle ring, 1-motor shaft, 2-motor stator cavity, 3-bearing oil tank, 4-oil baffle tube cavity, 5-lubricating oil, 6-rotor fan, 7-vent hole, 8-stator winding, 9-oil baffle tube, 10-bearing, 11-thrust head, 12-wind baffle ring. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The purpose of this invention is to provide a vertical motor and its bearing oil mist sealing device to solve the problems existing in the prior art, which can prevent oil mist in the bearing oil tank from entering the motor stator cavity and avoid oil mist contamination of the stator winding.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 2-3 As shown, this embodiment provides a bearing oil mist sealing device for a vertical motor, including a positive pressure fan assembly 100, which is mounted on the motor shaft 1 and located inside the motor stator cavity 2.

[0026] In this embodiment, the positive pressure fan assembly 100 includes a fan base 101 and a fan blade 102.

[0027] The fan seat 101 is a ring-shaped structure used to be fixedly sleeved on the motor shaft 1; specifically, in this embodiment, the fan seat 101 can be interference-fitted with the motor shaft 1.

[0028] The fan blade 102 is fixed to the outer ring surface of the fan base 101. The fan blade 102 is a plate-shaped structure extending along the axial direction of the motor shaft 1, and the fan blade 102 is inclined to the radial plane of the motor shaft 1. The inclination direction allows the fan blade 102 to apply an axial force along the motor shaft 1 to the air when it rotates with the motor shaft 1, so as to generate airflow from the motor shaft 1 to the bearing oil tank 3, thereby preventing the oil mist in the bearing oil tank 3 from entering the motor stator cavity 2.

[0029] It should be understood that the aforementioned fan blade 102 can be an inclined straight plate structure or a spirally extended plate structure with a certain curvature. As long as the fan blade 102 can meet the usage requirements, it falls within the protection scope of this invention. In addition, "the fan blade is inclined to the radial plane of the motor shaft" can mean that the plane of the straight plate fan blade 102 is inclined to the radial plane of the motor shaft 1, or the tangential plane of the arc-shaped fan blade 102 is inclined to the radial plane of the motor shaft 1. Optionally, the fan blade 102 provided in the embodiment of this invention is an arc-shaped plate, and the concave surface of the fan blade 102 is arranged facing the rotation direction of the motor shaft 1, which can guide the airflow more smoothly and reduce eddy current losses. Under the same motor speed, the same number and size of blades, the arc-shaped blade has higher aerodynamic efficiency than the straight blade.

[0030] When the motor is running, the motor shaft 1 drives the fan blade 102 to rotate, which can generate airflow from the motor shaft 1 to the bearing oil tank 3. This airflow enters the oil baffle cavity 4 to form an active positive pressure, preventing the oil mist generated by the lubricating oil 5 in the bearing oil tank 3 from entering the motor stator cavity 2 through the vent 7 along the oil baffle cavity 4 under the negative pressure generated by the rotor fan 6, thus avoiding oil mist contamination of the stator winding 8.

[0031] Furthermore, multiple fan blades 102 are provided, and all fan blades 102 are evenly distributed on the outer ring surface of the fan base 101.

[0032] In this embodiment, the positive pressure fan assembly 100 further includes a baffle ring 103, which is sleeved on the outside of each fan blade 102, and the inner wall of the baffle ring 103 is fixedly connected to the end of each fan blade 102 to prevent airflow along the radial direction of the motor shaft 1 when the fan blade 102 rotates.

[0033] It should be noted that the fan base 101, fan blades 102, and wind deflector ring 103 in this embodiment are preferably made of metal. Each fan blade 102 is evenly welded to the fan base 101, and the wind deflector ring 103 is welded to each fan blade 102 to complete the assembly of the positive pressure fan assembly 100. The fan base 101 can be interference-fitted with the motor shaft 1 to complete the installation of the positive pressure fan assembly 100 and the motor shaft 1.

[0034] The working principle of the bearing oil mist sealing device for vertical motors provided in this embodiment is as follows: For vertical motors using thin oil lubrication, the oil baffle 9 is welded to the bearing oil tank 3 to form a container that can hold the bearing 10 and the lubricating oil 5. The bearing 10 is immersed in the lubricating oil 5. The thrust head 11 is installed and fixed on the motor shaft 1. The motor shaft 1 passes through the oil baffle 9. A vent hole 7 is machined above the cavity of the thrust head 11. The oil baffle 9 is located in the middle between the thrust head 11 and the motor shaft 1. The gap between the oil baffle 9 and the motor shaft 1 forms the oil baffle cavity 4. Below the bearing oil tank 3 are the motor stator and rotor. Due to the need for ventilation and cooling, a rotor fan 6 is generally installed on the rotor. A wind baffle ring 12 is installed at the end of the stator winding 8.

[0035] When this device is not installed, the motor is running and the bearing 10 rotates at high speed, generating heat that heats the lubricating oil 5 and produces oil mist. At the same time, the rotor fan 6 rotates at high speed, creating a negative pressure zone inside the motor stator cavity 2. Under the action of negative pressure, the oil mist enters the motor stator cavity 2 through the vent hole 7 on the thrust head 11 and the oil baffle cavity 4, contaminating the windings and other components.

[0036] After this device is installed (i.e., the positive pressure fan assembly 100 is interference-fitted onto the motor shaft 1 and positioned below the bearing oil tank 3 and the oil baffle pipe 9), the motor runs, and the fan blades 102, which rotate at high speed along with the motor shaft 1, generate upward airflow that blows into the oil baffle pipe cavity 4. The positive pressure generated counteracts the negative pressure inside the motor stator cavity 2, preventing oil mist from entering the stator through the oil baffle pipe cavity 4 and contaminating the stator windings 8 and other components. The wind baffle ring 103 located on the outer circumference of the fan blades 102 prevents the fan blades 102 from generating radial airflow when rotating, reducing interference.

[0037] This embodiment also provides a vertical motor, including a vertical motor body and the aforementioned bearing oil mist sealing device for the vertical motor, wherein the bearing oil mist sealing device for the vertical motor is interference-fitted with the motor shaft of the vertical motor body.

[0038] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A bearing oil mist sealing device for a vertical motor, characterized in that: include: A positive pressure fan assembly is used to mount on the motor shaft and is located within the motor stator cavity; The positive pressure fan assembly includes fan blades, which are plate-shaped structures extending axially along the motor shaft. The fan blades are inclined to the radial plane of the motor shaft, and the inclination direction allows the fan blades to apply an axial force along the motor shaft when rotating with the motor shaft, thereby generating airflow from the motor shaft to the bearing oil tank, thus preventing oil mist in the bearing oil tank from entering the motor stator cavity.

2. The bearing oil mist sealing device for a vertical motor according to claim 1, characterized in that: The positive pressure fan assembly also includes: A fan mount is used to fix it onto the motor shaft; the fan blades are disposed on the fan mount.

3. The bearing oil mist sealing device for a vertical motor according to claim 2, characterized in that: The fan base has a ring-shaped structure; the fan blades are fixed to the outer ring surface of the fan base.

4. The bearing oil mist sealing device for a vertical motor according to claim 3, characterized in that: The fan blades are provided in multiple ways, and all the fan blades are evenly distributed on the outer ring surface of the fan base.

5. The bearing oil mist sealing device for a vertical motor according to claim 4, characterized in that: The positive pressure fan assembly also includes: A windbreak is provided on the fan blade to prevent airflow along the motor shaft from being generated when the fan blade rotates.

6. The bearing oil mist sealing device for a vertical motor according to claim 5, characterized in that: The windbreak part is a windbreak ring, which is sleeved on the outside of each of the fan blades.

7. The bearing oil mist sealing device for a vertical motor according to claim 6, characterized in that: The inner wall of the windshield ring is fixedly connected to the ends of each of the fan blades.

8. The bearing oil mist sealing device for a vertical motor according to claim 1, characterized in that: The fan blade is an arc-shaped plate, and the concave surface of the fan blade is oriented towards the rotation direction of the motor shaft.

9. A vertical motor, characterized in that: The invention includes a vertical motor body and a bearing oil mist sealing device for a vertical motor as described in any one of claims 1-8, wherein the bearing oil mist sealing device for a vertical motor is mounted on the motor shaft of the vertical motor body.

10. The vertical motor according to claim 9, characterized in that: The bearing oil mist sealing device for the vertical motor is interference-fitted with the motor shaft of the vertical motor body.

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