Bearing heat insulation protection structure of underwater motor

Abstract

The utility model discloses a bearing heat insulation protection structure of an underwater motor. The bearing heat insulation protection structure comprises a sealing housing. A bearing chamber; the tail bearing is arranged in the bearing chamber; the main shaft is arranged on the tail bearing; the heat insulation ring is arranged on the main shaft; an extension pipe is arranged in the sealing shell; the heat insulation ring is located in the bearing chamber and the extension pipe. At least one notch is formed in the inner wall of the heat insulation ring; a plurality of convex plates are arranged at one end, far away from the tail bearing, of the heat insulation ring; and the convex plate is positioned in the extension pipe. The heat insulation ring separates the bearing from the stator coil, and evaporation of lubricating grease is reduced. The extension pipe wrapping the heat insulation ring is arranged on the outer side of the bearing chamber, heat transfer is prevented, and meanwhile the area of a heat exchange area is reduced. The protrusions are arranged on the heat insulation rings, wind pressure flowing towards the outer side is formed through rotation of the main shaft, the opening section of the heat insulation cavity is smaller than the section of the inner cavity, and internal gas can flow out conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of underwater motor technology, and in particular relates to a bearing heat insulation protection structure for underwater motors. Background Technology

[0002] During motor operation, the coils of the stator generate the most heat. The temperature of the coils directly affects the bearings, which are temperature-dependent. Higher temperatures cause the bearing grease to evaporate faster, resulting in a shorter bearing lifespan. Currently, after prolonged operation, bearings in motors can overheat or remain at high temperatures for extended periods, leading to lubrication loss, decreased bearing lubrication, bearing seizure, and ultimately, motor burnout. Existing technology often uses external cooling fans to expel hot air from the motor. However, for underwater motors, due to the lack of external ventilation holes and the need for complete internal sealing, cooling fans cannot be used for heat dissipation.

[0003] Chinese patent document CN211063457U discloses a high-pressure cage-type protective motor bearing heat insulation device, including a base end cover, a bearing, an outer bearing cover, an inner bearing cover, a base, and a heat insulation plate. The bearing is installed inside the base end cover, and the outer bearing cover and the inner bearing cover are respectively installed on both sides of the bearing. The outer bearing cover and the inner bearing cover are fixedly connected to the base end cover, and the base end cover is fixedly connected to the base. The heat insulation plate is fixedly installed on the inner side of the inner bearing cover, and the shape of the heat insulation plate matches the inner side shape of the inner bearing cover in contact with it. The material of the heat insulation plate is glass cloth.

[0004] In the aforementioned patented solution, the heat insulation properties of the glass cloth material are used to provide heat insulation to the bearing inner cover, reducing the heat conducted to the bearing. However, when applied to underwater motors, since the underwater motor housing already has sufficient sealing and the motor structure is often required to be compact, an additional bearing cover is not necessary. When the glass cloth is directly placed between the bearing and the coil, its dimensional accuracy is poor due to its manufacturing process, and the glass cloth also has irregular thermal deformation capabilities, making it difficult to control its dimensions. If the size is too large, it will scratch the shaft or motor housing due to temperature changes; if the size is too small, it will leave a large heat exchange gap, failing to provide sufficient heat insulation. Utility Model Content

[0005] To overcome the technical problem that existing underwater motors require bearing insulation, but the existing insulation materials are difficult to control in terms of size due to poor dimensional accuracy and thermal deformation, resulting in scratches inside the casing or insufficient insulation, one objective of this utility model is to provide a bearing insulation protection structure for underwater motors. This structure involves setting an insulation ring on the main shaft to block the opening of the bearing chamber, and setting an extension tube on the outer side of the bearing chamber to wrap the insulation ring. This prevents heat transfer and reduces the area of ​​the heat exchange zone. In addition, a protrusion is set on the insulation ring, and the rotation of the main shaft generates outward air pressure to further prevent heat transfer.

[0006] To achieve the above objectives, this utility model employs the following technical solution: a bearing heat insulation protection structure for an underwater motor, comprising a sealed outer shell; a bearing chamber coaxially disposed at the inner bottom of the sealed outer shell; a tail bearing disposed within the bearing chamber; a main shaft, one end of which is disposed on the tail bearing; and a heat insulation ring disposed on the main shaft and located on the side of the tail bearing facing the other end of the main shaft; wherein, an extension tube is provided at the inner bottom of the sealed outer shell, the inner diameter of which is larger than the inner diameter of the bearing chamber; the heat insulation ring is located simultaneously within the bearing chamber and the extension tube; the inner wall of the heat insulation ring has at least one notch; the heat insulation ring is mounted on the main shaft with an interference fit; a plurality of protrusions evenly distributed along the circumferential direction are provided at the end of the heat insulation ring away from the tail bearing; the protrusions are located within the extension tube.

[0007] Furthermore, a stepped shaft is provided at one end of the main shaft near the tail bearing; the outer diameter of the stepped shaft is smaller than the outer diameter of the main shaft; a tapered surface is provided at the connection between the stepped shaft and the main shaft; the middle part of the tapered surface is directly opposite the end of the extension tube.

[0008] Specifically, a spacer ring is coaxially disposed at one end of the heat insulation ring facing the tail bearing; the spacer ring abuts against the inner ring of the tail bearing; and the two ends of the heat insulation ring abut against the inner ring of the tail bearing and the end of the stepped shaft, respectively.

[0009] The conical surface, the outer wall of the stepped shaft, the inner wall of the extension tube, and the heat insulation ring together form a heat insulation cavity with an annular opening. The cross-sectional area of ​​the annular opening is smaller than the cross-sectional area of ​​the heat insulation cavity. As the main shaft drives the heat insulation ring to rotate, the convex plate disturbs the airflow inside the heat insulation cavity, preventing external hot airflow from entering.

[0010] Furthermore, the bearing chamber inner wall is provided with an annular inner boss; the inner boss is directly opposite the outer ring of the tail bearing, and an annular wave spring sheet is provided between the inner boss and the outer ring of the tail bearing.

[0011] The annular space of the inner boss provides space for the escape of lubricating grease. On the one hand, it can hold excess lubricating grease, and on the other hand, after the escaped lubricating grease solidifies, some of it will re-adhere to the tail bearing.

[0012] Specifically, the cross-section of the wave spring sheet is V-shaped, and the two ends of the V-shape abut against the inner and outer rings of the tail bearing, respectively.

[0013] Furthermore, the heat insulation ring is made of Q235 steel; the heat insulation ring is formed by stamping.

[0014] Optionally, the convex plate is a linear straight plate arranged radially along the heat insulation ring or a linear inclined plate having an angle with the diameter of the heat insulation ring.

[0015] Furthermore, the distance between the outer wall of the heat insulation ring and the inner wall of the bearing chamber is 0.3 mm.

[0016] Furthermore, an annular cavity is coaxially arranged at the bottom of the inner side of the sealed housing and on the outer periphery of the bearing housing; a wire guide plate is provided at the opening of the annular cavity; a wire through hole is provided on the wire guide plate; and an external lead-in port is provided on the sealed housing, which is directly opposite to the wire through hole.

[0017] The annular cavity also increases the volume of hot air it holds, thus increasing the thermal contact area and facilitating heat exchange between the sealed outer shell and the external medium. The wiring plate prevents external impurities from entering the motor's operating area during maintenance and repair, protecting the motor's main structure.

[0018] Furthermore, two head bearings are provided at the end of the sealing housing away from the bearing chamber; the main shaft extends through the inner ring of the head bearing; and a bearing retainer ring for fixing the outer ring of the head bearing is provided inside the sealing housing.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. By installing a heat shield ring on the spindle to block the bearing chamber opening, the bearing and stator coil are separated. Tests have shown that the bearing with the heat shield ring has a temperature that is about 20°C lower than the bearing without the heat shield ring, which reduces the evaporation of bearing grease and extends the life of the tail bearing.

[0021] 2. At the same time, an extension tube wrapped with a heat insulation ring is also installed on the outer side of the bearing chamber to prevent heat transfer and reduce the area of ​​the heat exchange zone. According to the test, the 0.3mm gap between the heat insulation ring and the inner wall of the bearing chamber can play the maximum protection role. Even if there is thermal deformation, it will not cause the heat insulation ring to scratch the sealing shell.

[0022] 3. Additionally, protrusions are set on the insulation ring to generate outward air pressure by rotating the main shaft. At the same time, the opening cross-section of the insulation cavity is smaller than that of the inner cavity cross-section, which facilitates the outward flow of internal gas.

[0023] 4. Compared with commonly used thermal insulation materials, Q235 steel is easy to process, has high processing precision, low cost, and reliable quality. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 2 For the present utility model Figure 1 Enlarged structural diagram of section A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the heat insulation ring of this utility model.

[0027] In the diagram: 1. Sealed outer shell; 11. Extension tube; 12. Heat insulation cavity; 13. Cable guide plate; 14. Cable through hole; 15. External lead-in port; 16. Annular cavity; 17. Inner boss; 2. Main shaft; 21. Conical surface; 22. Stepped shaft; 3. Tail bearing; 4. Heat insulation ring; 41. Spacer ring; 42. Protruding plate; 43. Notch; 5. Wave spring plate; 6. Stator coil; 7. Head bearing; 8. Bearing retaining ring. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] See Figures 1-3 A bearing heat insulation protection structure for an underwater motor includes a sealed outer shell 1, a bearing chamber coaxially disposed on the left side of the inner wall of the sealed outer shell 1, a tail bearing 3 coaxially disposed in the bearing chamber, and a main shaft 2 coaxially rotatably connected within the sealed outer shell 1. A heat insulation ring 4 is coaxially disposed on the main shaft 2; an extension tube 11 is coaxially disposed on the inner wall of the sealed outer shell 1; the inner diameter of the extension tube 11 is larger than the inner diameter of the bearing chamber; the heat insulation ring 4 is located within both the bearing chamber and the extension tube 11; the distance between the outer wall of the heat insulation ring 4 and the inner wall of the bearing chamber is 0.3 mm.

[0033] The heat insulation ring 4 is made of Q235 steel; the heat insulation ring 4 is formed by stamping.

[0034] The inner wall of the heat insulation ring 4 has four notches 43 evenly distributed along the circumferential direction; the heat insulation ring 4 is mounted on the main shaft 2 with an interference fit; the end of the heat insulation ring 4 away from the tail bearing 3 has multiple protrusions 42 evenly distributed along the circumferential direction; the protrusions 42 are located inside the extension tube 11. The protrusions 42 are linear straight plates arranged radially along the heat insulation ring 4, linear inclined plates forming an angle with the diameter of the heat insulation ring 4, or curved plates arranged along an involute, etc.

[0035] A stepped shaft 22 is provided at one end of the main shaft 2 near the tail bearing 3; the outer diameter of the stepped shaft 22 is smaller than the outer diameter of the main shaft 2; a tapered surface 21 is provided at the connection between the stepped shaft 22 and the main shaft 2; the middle part of the tapered surface 21 is directly opposite the end of the extension tube 11. A minor diameter shaft is provided at the end of the stepped shaft 22, the diameter of which is smaller than the diameter of the stepped shaft 22, and the minor diameter shaft is interference-fitted into the inner ring of the tail bearing 3.

[0036] A spacer ring 41 is coaxially disposed at one end of the heat insulation ring 4 facing the tail bearing 3; the spacer ring 41 abuts against the inner ring of the tail bearing 3; the two ends of the heat insulation ring 4 abut against the inner ring of the tail bearing 3 and the end of the stepped shaft 22, respectively. The conical surface 21, the outer wall of the stepped shaft 22, the inner wall of the extension tube 11, and the heat insulation ring 4 together form a heat insulation cavity 12 with an annular opening; the cross-sectional area of ​​the annular opening is smaller than the cross-sectional area of ​​the heat insulation cavity 12.

[0037] The bearing chamber has an annular inner boss 17 on its inner wall; the inner boss 17 is directly opposite the outer ring of the tail bearing 3, and an annular wave spring 5 is disposed between the inner boss 17 and the outer ring of the tail bearing 3. The wave spring 5 has a V-shaped cross-section, and the two ends of the V-shape abut against the inner and outer rings of the tail bearing 3, respectively.

[0038] The bottom of the sealed housing 1 is coaxially provided with an annular cavity 16 on the outer periphery of the bearing housing; the annular cavity 16 is directly opposite the stator coil 6; a wire guide plate 13 is provided at the opening of the annular cavity 16; a wire guide hole 14 is provided on the wire guide plate 13; and an external lead-in port 15 is provided on the sealed housing 1, which is directly opposite to the wire guide hole 14.

[0039] Two head bearings 7 are provided on the right side of the inner wall of the sealed housing 1; the main shaft 2 passes through the inner ring of the head bearing 7; a bearing retainer 8 for fixing the outer ring of the head bearing 7 is provided inside the sealed housing 1.

[0040] The sealed housing 1 includes a central tube and end caps that are detachably connected to both ends of the central tube.

[0041] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A bearing heat insulation protection structure for an underwater motor, characterized in that: It includes a sealed outer shell and a bearing chamber, the bearing chamber being coaxially disposed at the inner bottom of the sealed outer shell; A tail bearing, wherein the tail bearing is disposed in the bearing housing; A main shaft, one end of which is mounted on the tail bearing; A heat insulation ring is disposed on the main shaft and located on the side of the tail bearing facing the other end of the main shaft; The inner bottom of the sealed housing is provided with an extension tube, the inner diameter of which is larger than the inner diameter of the bearing chamber; the heat insulation ring is located in both the bearing chamber and the extension tube; the inner wall of the heat insulation ring is provided with at least one notch; a plurality of protrusions evenly distributed along the circumference are provided at the end of the heat insulation ring away from the tail bearing; the protrusions are located in the extension tube.

2. The protective structure as described in claim 1, characterized in that: A stepped shaft is provided at one end of the main shaft near the tail bearing; the outer diameter of the stepped shaft is smaller than the outer diameter of the main shaft; a tapered surface is provided at the connection between the stepped shaft and the main shaft; the middle part of the tapered surface is directly opposite the end of the extension tube.

3. The protective structure as described in claim 2, characterized in that: A spacer ring is coaxially disposed at one end of the heat insulation ring facing the tail bearing; the spacer ring abuts against the inner ring of the tail bearing; the two ends of the heat insulation ring abut against the inner ring of the tail bearing and the end of the stepped shaft, respectively.

4. The protective structure as described in any one of claims 1-3, characterized in that: The bearing chamber has an annular inner boss; the inner boss is directly opposite the outer ring of the tail bearing, and an annular wave spring is provided between the inner boss and the outer ring of the tail bearing.

5. The protective structure as described in claim 4, characterized in that: The cross-section of the wave spring sheet is V-shaped, and the two ends of the V-shape abut against the inner and outer rings of the tail bearing, respectively.

6. The protective structure as described in any one of claims 1-3, characterized in that: The heat insulation ring is made of Q235 steel; the heat insulation ring is formed by stamping.

7. The protective structure as described in any one of claims 1-3, characterized in that: The convex plate is a linear straight plate arranged radially along the heat insulation ring or a linear inclined plate having an angle with the diameter of the heat insulation ring.

8. The protective structure as described in any one of claims 1-3, characterized in that: The distance between the outer wall of the heat insulation ring and the inner wall of the bearing chamber is 0.3 mm.

9. The protective structure as described in any one of claims 1-3, characterized in that: The bottom of the sealed housing is coaxially arranged with an annular cavity on the outer periphery of the bearing housing; a wire guide plate is provided at the opening of the annular cavity; a wire guide hole is provided on the wire guide plate; and an external lead-in port is provided on the sealed housing, which is directly opposite to the wire guide hole.

10. The protective structure as described in any one of claims 1-3, characterized in that: Two head bearings are provided at the end of the sealed housing away from the bearing chamber; the main shaft extends through the inner ring of the head bearing; a bearing retainer ring for fixing the outer ring of the head bearing is provided inside the sealed housing.

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