A bushing temperature measuring lead wire inner sealing assembly and a two-stage sealing device

Abstract

The application discloses a bearing bush temperature measurement lead wire inner sealing assembly and a two-stage sealing device, relates to the technical field of rotating machinery shaft system lead wire sealing, and the inner sealing assembly comprises a modified bakelite strip, A sealing glue and a heat shrink tube, a plurality of arc-shaped grooves which are matched with the temperature measurement lead wire are formed in the modified bakelite strip along the length direction of the outer surface, the heat shrink tube is sleeved on the modified bakelite strip and is used for fixing the temperature measurement lead wire in the arc-shaped groove, and the A sealing glue is filled between the modified bakelite strip and the heat shrink tube. The two-stage sealing device comprises the inner sealing assembly and the outer sealing assembly which are both sealingly connected with the temperature measurement lead wire, the heat shrink tube which is used for wrapping the temperature measurement lead wire is arranged between the inner sealing assembly and the outer sealing assembly, and the inner sealing assembly and the outer sealing assembly block the oil seepage between the temperature measurement lead wire and the oil seepage on the outer surface of the heat shrink tube. The problems that the sealing effect is poor, maintenance is inconvenient, and lubricating oil is prone to residual seepage in the threading pipeline due to oil leakage of the existing bearing bush temperature measurement lead wire sealing device are solved.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for rotating machinery shaft leads, specifically to an internal sealing assembly and a two-stage sealing device for a bearing temperature measuring lead. Background Technology

[0002] When rotating machinery is running, the bearing temperature needs to be monitored by a bearing bearing temperature sensing element (such as a dual thermocouple). The sensing element is installed on the bearing bearing inside the bearing housing, and its 4-core temperature sensing lead needs to pass through the bearing housing and connect to an external terminal box to finally send the temperature signal to the control system. Since the bearing housing is filled with lubricating oil, during long-term operation of the unit, the lubricating oil can easily seep out of the bearing housing along the outer surface of the lead or the gap between the lead, resulting in lubricating oil loss, environmental pollution, and may also affect the normal operation of the terminal box equipment.

[0003] To prevent lubricating oil leakage, patent document CN205231702U discloses a sealing connection device for oil leakage of the probe lead of a compressor unit shaft system instrument detection probe. This technology treats oil leakage by adding an absolutely sealed connection device between the bearing housing and the junction box, which has the advantages of preventing oil leakage of the lead and not damaging the probe and probe lead during disassembly and assembly. However, careful analysis revealed that because the junction box is installed on the bearing housing wall, the distance between the wiring conduits is very short, resulting in the junction box and the glue-sealed box lacking a supporting and fixed foundation, thus rendering it impractical. Summary of the Invention

[0004] The purpose of this invention is to provide a simple, reliable, easy-to-assemble and disassemble, and highly adaptable bearing bearing temperature measuring lead internal sealing component and dual-stage sealing device, which aims to solve the technical problems of poor sealing effect, inconvenient maintenance, and easy leakage of lubricating oil residue in the wiring pipeline caused by oil leakage in existing bearing bearing temperature measuring lead sealing devices.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A bearing bearing temperature sensing lead inner sealing assembly includes a modified bakelite strip, A sealant, and heat shrink tubing. The modified bakelite strip has multiple arc-shaped grooves along its outer surface length that are adapted to the temperature sensing lead. The heat shrink tubing is sleeved on the modified bakelite strip to fix the temperature sensing lead in the arc-shaped grooves. The A sealant is filled between the modified bakelite strip and the heat shrink tubing.

[0006] The lower end of the heat shrink tubing is flush with the lower end of the modified bakelite strip, and sealant A is filled between the upper half of the modified bakelite strip and the heat shrink tubing.

[0007] The heat shrink tubing has a reflux hole located at the upper part of the lower half of the modified bakelite strip.

[0008] A dual-stage sealing device for a bearing bearing temperature sensing lead includes an inner sealing assembly for vertically mounting inside the bearing housing and an outer sealing assembly for externally fixing to the bearing housing. Both the inner and outer sealing assemblies are sealed to the temperature sensing lead. A heat shrink tubing is provided between the inner and outer sealing assemblies to jointly wrap the temperature sensing lead. The inner and outer sealing assemblies cooperate to form a dual-stage synergistic sealing structure, which respectively blocks oil leakage between the core wires of the temperature sensing lead and oil leakage from the outer surface of the heat shrink tubing.

[0009] The inner sealing assembly includes a modified bakelite strip, A sealant, and heat shrink tubing. The modified bakelite strip has an arc-shaped groove along its length that is adapted to the temperature sensing lead. The heat shrink tubing is fixedly sleeved on the modified bakelite strip, and the temperature sensing lead is sealed between the modified bakelite strip and the heat shrink tubing by the A sealant. The heat shrink tubing has an extension section that wraps around the temperature sensing lead. The extension section extends out of the bearing housing and is fixedly connected to the outer sealing assembly.

[0010] The lower end of the heat shrink tubing is flush with the lower end of the modified bakelite strip, and sealant A is filled between the upper half of the modified bakelite strip and the heat shrink tubing.

[0011] The heat shrink tubing has a reflux hole located at the upper part of the lower half of the modified bakelite strip.

[0012] The external sealing assembly includes a first connector, a second connector, and a locking cap through which the extension section passes in sequence. The first connector, the second connector, and the locking cap are fixedly connected in sequence. A sealing plug and a first sealing gasket for clamping and sealing the heat shrink tubing are fixed between the first connector and the second connector. A second sealing gasket for clamping and sealing the heat shrink tubing is fixed between the second connector and the locking cap.

[0013] The external sealing assembly has a sealing area located within the connection area of ​​the first sealing gasket, the second connector body, and the second sealing gasket. The space between the heat shrink tubing and the second connector body within the sealing area is filled with sealant B.

[0014] The first connector has an NPT1 / 2 external thread on one side for connection to the bearing housing, and an M24×1.5 external thread and a tapered groove on the other side; the second connector has an M24×1.5 internal thread on one side and an M24×1.5 external thread on the other side for fixing and locking the cap; the sealing plug is a tapered fluororubber structure located in the tapered groove, and the sealing plug has a through hole inside, the size of which matches the outer diameter of the heat shrink tubing after wrapping the temperature measuring lead.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The core function of the internal sealing component provided by this invention is to prevent lubricating oil from flowing along the outer surface of the temperature sensing lead to the outside of the bearing housing. It effectively blocks oil leakage between the core wires in the temperature sensing lead. In application, it is mainly installed inside the bearing housing and can be used in conjunction with an external sealing structure. It has the advantages of simple structure and good oil leakage prevention effect.

[0016] 2. The dual-stage sealing device provided by the present invention has an inner sealing component that can specifically block the oil seepage channels between multiple (4) core wires, and an outer sealing component that can block the oil seepage path on the outer surface of the heat shrink tubing. The two work together to form a dual-stage precise seal, which has the advantage of no dead corners of leakage and can completely solve the oil leakage problem.

[0017] 3. In this invention, the inner sealing component is placed vertically, and with the heat shrink tubing return hole, the oil can flow back to the bearing housing under the action of gravity, reducing oil residue. At the same time, the sealant prevents the oil from penetrating to the outside, avoiding the risk of residual leakage.

[0018] 4. The external sealing assembly of the present invention integrates a quadruple external sealing structure including a sealing plug, double sealing gaskets and sealant. The multiple sealing enhances the reliability of the sealing structure, adapts to the irregular outer diameter of heat shrink tubing, provides stable sealing effect, and the sealing plug, modified bakelite strip and heat shrink tubing are all oil-resistant and high-temperature resistant, while the sealant is not prone to aging and has a long service life.

[0019] 5. The structure of this invention has no complex nesting, and disassembly does not require violent disassembly. It is convenient to disassemble and assemble, adapts to maintenance needs, can effectively avoid damage to the temperature measuring lead, and meets the usage scenarios of regular maintenance of the tile.

[0020] 6. The present invention has a simple structure and strong adaptability. It does not rely on the installation space of bearing housing and terminal box and can be directly installed on the bearing housing wall. It is suitable for sealing temperature measurement lead wires of various rotating machinery shaft systems. Attached Figure Description

[0021] Figure 1 This is a schematic cross-sectional view of the internal sealing assembly. Figure 2 A schematic diagram of the three-dimensional structure of the modified bakelite strip; Figure 3 This is a schematic diagram of the structure of heat shrink tubing; Figure 4 This is a schematic diagram of the overall structure of the two-stage sealing device; Figure 5 This is a schematic diagram of the external sealing assembly.

[0022] The markings in the diagram are as follows: 1. Inner sealing assembly, 2. Outer sealing assembly, 3. Temperature sensing lead, 4. Bearing housing, 5. Modified bakelite strip, 6. A sealant, 7. Heat shrink tubing, 8. Arc groove, 9. Return hole, 10. First connector, 11. Second connector, 12. Locking cap, 13. Sealing plug, 14. First sealing gasket, 15. Second sealing gasket, 16. B sealant. Detailed Implementation

[0023] Example 1 like Figure 1-3 As shown, this embodiment provides an internal sealing assembly for a bearing bearing temperature sensing lead. This internal sealing assembly is preferably vertically positioned inside the bearing housing 4 during use, and specifically includes a modified bakelite strip 5, A-type sealant 6, and heat shrink tubing 7. Both the modified bakelite strip 5 and the heat shrink tubing 7 have oil-resistant and high-temperature-resistant properties. The modified bakelite strip 5 is a phenolic resin modified with nitrile rubber. The modified bakelite strip 5 can be circular to facilitate adhesion to the heat shrink tubing 7, with a length of 50mm and a diameter of 8mm. The modified bakelite strip 5 has multiple arc-shaped grooves 8 along its outer surface length direction, each adapted to the temperature sensing lead 3. The number of arc-shaped grooves 8 corresponds to the number of core wires in the temperature sensing lead 3. Typically, there are four arc-shaped grooves 8, evenly distributed on the modified bakelite strip 5. Each core wire of the temperature sensing lead 3 is placed within its respective arc-shaped groove 8. The heat shrink tubing 7 is fitted onto the modified bakelite strip 5. After the heat shrink tubing 7 is heat-shrinked, it cooperates with the modified bakelite strip 5 to fix the temperature sensing lead 3 in the arc-shaped groove 8. The sealant A 6 can be a deoxime type silicone, which is filled between the modified bakelite strip 5 and the heat shrink tubing 7.

[0024] In this embodiment, the heat shrink tubing 7 can be 300mm long, with its lower end flush with the lower end of the modified bakelite strip 5. Its upper end wraps around the temperature sensing lead 3, extending out of the bearing housing 4, and can be connected to other sealing structures. The lower half of the modified bakelite strip 5 and the heat shrink tubing 7 are not filled with sealant A 6. Starting from the middle of the modified bakelite strip 5, sealant A 6 is filled between the upper half of the modified bakelite strip 5 and the heat shrink tubing 7, completely filling the gaps between each temperature sensing lead 3 and the arc-shaped groove 8 and the heat shrink tubing 7 in the upper half. This prevents lubricating oil from seeping between the core wires, thus achieving a better blocking effect.

[0025] Furthermore, the heat shrink tubing 7 is also provided with a reflux hole 9, which is located on the upper part of the lower half of the modified bakelite strip 5. Specifically, the reflux hole 9 is located 20mm from the lower end and has a size of 2mm. Since the channel is sealed and isolated at the midpoint of the modified bakelite strip 5 through the A sealant 6, the remaining lubricating oil adhering to the surface of the temperature sensing lead 3 can flow back into the bearing housing 4 through the 2mm reflux hole 9, thereby effectively preventing the lubricating oil from flowing along the outer surface of the temperature sensing lead 3 to the outside of the bearing housing 4.

[0026] The assembly process in this embodiment is as follows: 1. Embed the four temperature sensing leads 3 into the four rows of arc-shaped grooves 8 of the modified bakelite strip 5 respectively, ensuring that the core wires are evenly distributed and free from tangling; 2. Fill the modified bakelite strip 5 from the midpoint (25mm) upwards with deoxime-type silicone, ensuring that the silicone fills all gaps between the temperature sensing lead 3 and the groove wall and the inner wall of the heat shrink tubing 7. Do not fill the lower half with silicone.

[0027] 3. Insert the heat shrink tubing 7 from the end of the temperature sensing lead 3, making it flush with the lower end of the modified bakelite strip 5, ensuring that the 2mm reflux hole 9 on the heat shrink tubing 7 faces the inside of the bearing housing 4, thus completing the installation of the inner sealing assembly 1 and the temperature sensing lead 3.

[0028] In actual use, if the lubricating oil in the bearing housing 4 seeps along the outer surface of the temperature measuring lead 3, it will converge in the gap between the heat shrink tube 7 and the bakelite strip of the inner sealing component 1. Since the inner sealing component 1 is placed vertically, the oil will flow back to the bearing housing 4 through the return hole 9 on the heat shrink tube 7 under the action of gravity. The oil that does not return will be blocked by the A sealant 6 after the midpoint of the modified bakelite strip 5 and will not be able to penetrate to the outside.

[0029] Example 2 like Figure 4 , 5 As shown, this embodiment provides a dual-stage sealing device for the bearing temperature sensing lead 3. This dual-stage sealing device includes an inner sealing component 1 and an outer sealing component 2 as described in Embodiment 1. The inner sealing component 1 is vertically installed inside the bearing housing 4, and its core function is to prevent lubricating oil from flowing along the outer surface of the temperature sensing lead 3 to the outside of the bearing housing 4. The outer sealing component 2 is fixed to the bearing housing 4 from the outside, and its core function is to prevent oil leakage along the outer surface of the heat shrink tubing 7, effectively preventing lubricating oil from leaking to the outside of the bearing housing 4 through the gap between the heat shrink tubing 7 and related components. Both the inner sealing component 1 and the outer sealing component 2 are sealed to the temperature sensing lead 3. The inner sealing component 1 and the outer sealing component 2 share a common heat shrink tubing 7 that wraps around the temperature sensing lead 3. The inner sealing component 1 and the outer sealing component 2 cooperate to form a dual-stage synergistic sealing structure, respectively blocking oil leakage between the core wires in the temperature sensing lead 3 and oil leakage from the outer surface of the heat shrink tubing 7.

[0030] like Figure 1-3As shown, the inner sealing component 1 includes a modified bakelite strip 5, A sealant 6, and heat shrink tubing 7. Both the modified bakelite strip 5 and the heat shrink tubing 7 have oil-resistant and high-temperature-resistant properties. The modified bakelite strip 5 is a phenolic resin modified with nitrile rubber. The modified bakelite strip 5 is circular to facilitate bonding with the heat shrink tubing 7. The length can be 50mm and the diameter can be 8mm. The modified bakelite strip 5 has multiple arc-shaped grooves 8 along the length of its outer surface, which are adapted to the temperature sensing leads 3. The number of arc-shaped grooves 8 is adapted to the number of core wires of the temperature sensing leads 3. There are usually 4 arc-shaped grooves 8, which are evenly arranged on the modified bakelite strip 5. Each core wire of the temperature sensing leads 3 is placed in each arc-shaped groove 8. The heat shrink tubing 7 is fixedly sleeved on the modified bakelite strip 5. After heat shrinking, the heat shrink tubing 7, together with the modified bakelite strip 5, fixes the temperature sensing lead 3 within the arc-shaped groove 8. Sealant A 6, which can be an oxime-type silicone sealant, is filled between the modified bakelite strip 5 and the heat shrink tubing 7. The heat shrink tubing 7, in conjunction with sealant A 6, effectively seals the temperature sensing lead 3 between the modified bakelite strip 5 and the heat shrink tubing 7. Furthermore, the heat shrink tubing 7 also has an extension section that wraps around the temperature sensing lead 3. This extension section extends out of the bearing housing 4 and is fixedly connected to the outer sealing assembly 2, so that the inner sealing assembly 1 and the outer sealing assembly 2 share a common heat shrink tubing 7 that wraps around the temperature sensing lead 3.

[0031] In this embodiment, the heat shrink tubing 7 can be 300mm long, with its lower end flush with the lower end of the modified bakelite strip 5. Its upper end wraps around the temperature sensing lead 3, extending out of the bearing housing 4, and can be connected to other sealing structures. The lower half of the modified bakelite strip 5 and the heat shrink tubing 7 are not filled with sealant A 6. Starting from the middle of the modified bakelite strip 5, sealant A 6 is filled between the upper half of the modified bakelite strip 5 and the heat shrink tubing 7, completely filling the gaps between each temperature sensing lead 3 and the arc-shaped groove 8 and the heat shrink tubing 7 in the upper half. This prevents lubricating oil from seeping between the core wires, thus achieving a better blocking effect.

[0032] Furthermore, the heat shrink tubing 7 is also provided with a reflux hole 9, which is located on the upper part of the lower half of the modified bakelite strip 5. Specifically, the reflux hole 9 is located 20mm from the lower end and has a size of 2mm. Since the channel is sealed and isolated at the midpoint of the modified bakelite strip 5 through the A sealant 6, the remaining lubricating oil adhering to the surface of the temperature sensing lead 3 can flow back into the bearing housing 4 through the 2mm reflux hole 9, thereby effectively preventing the lubricating oil from flowing along the outer surface of the temperature sensing lead 3 to the outside of the bearing housing 4.

[0033] Figure 1-3The detailed structure of the inner sealing assembly 1 is shown: the four temperature sensing leads 3 of the thermocouple are respectively embedded in the four arc-shaped grooves 8 of the modified bakelite strip 5, and the temperature sensing leads 3 are separated and arranged through the modified bakelite strip 5; after filling the upper half of the modified bakelite strip 5 with sealant A 6, the heat shrink tube 7 is sleeved on the outside of the temperature sensing leads 3. Since the inner sealing assembly 1 is placed vertically in the bearing housing 4, and the heat shrink tube 7 is flush with the lower end of the modified bakelite strip 5, and a return hole 9 is opened 20mm from the top, when the unit is running, the lubricating oil on the outer surface of the temperature sensing leads 3 will gather in the gap between the heat shrink tube 7, the modified bakelite strip 5 and the temperature sensing leads 3. Under the action of gravity, some of the lubricating oil will flow directly back to the oil tank; at the same time, because the channel is sealed and isolated by sealant A 6 at the midpoint (25mm) of the modified bakelite strip 5, the remaining lubricating oil adhering to the surface of the leads can flow back to the oil tank through the return hole 9 on the heat shrink tube 7.

[0034] In this embodiment, the external sealing assembly 2 is horizontally mounted on the wall of the bearing housing 4, including a first connector 10, a second connector 11, and a locking cap 12 fixedly connected in sequence. A sealing plug 13 and a first sealing gasket 14 for clamping and sealing the heat shrink tubing 7 are fixed between the first connector 10 and the second connector 11, and a second sealing gasket 15 for clamping and sealing the heat shrink tubing 7 is fixed between the second connector 11 and the locking cap 12. The external sealing assembly 2 has a sealing area located within the connection area of ​​the first sealing gasket 14, the body of the second connector 11, and the second sealing gasket 15. The space between the heat shrink tubing 7 and the body of the second connector 11 within the sealing area is filled with B sealant 16, which can be an oxime-type silicone rubber. The extension section of the temperature sensing lead 3 passes through the first connector 10, the second connector 11, and the locking cap 12 in sequence, and extends approximately 10 cm beyond the external sealing assembly 2.

[0035] Furthermore, one side of the first connector 10 is provided with an NPT1 / 2 external thread for connection with the bearing housing 4, used for threaded connection with the housing wall of the bearing housing 4; the other side is provided with an M24×1.5 external thread and a tapered groove. The external thread is used for connection with the second connector 11, and the tapered groove is used for installing the sealing plug 13. The sealing plug 13 has a tapered structure and is located in the tapered groove. It is made of fluororubber and has a through hole inside that matches the outer diameter of the heat shrink tubing 7 (including the internal temperature sensing lead 3). The heat shrink tubing 7 passes through this through hole. The first sealing gasket 14 is placed between the sealing plug 13 and the second connector 11. By rotating the second connector 11, the first sealing gasket 14 will compress the sealing plug 13, causing the sealing plug 13 to deform, thereby clamping and sealing the outer surface of the heat shrink tubing 7; the first sealing gasket 14 is also made of fluororubber. One side of the second connector 11 has an M24×1.5 internal thread for fixed connection with the first connector 10; the other side has an M24×1.5 external thread for fixing the locking cap 12. The second sealing gasket 15 is placed between the second connector 11 and the locking cap 12. By rotating the locking cap 12, the second sealing gasket 15 deforms, achieving clamping and sealing of the outer surface of the heat shrink tubing 7. After the sealing plug 13, the first sealing gasket 14, and the second sealing gasket 15 are deformed under force, they all act on the outer surface of the heat shrink tubing 7. After four temperature measuring leads 3 are inserted into the heat shrink tubing 7, its outer diameter is irregularly circular. Through the sealing area formed by the first sealing gasket 14, the second connector 11, and the second sealing gasket 15, the gap between the outer surface of the heat shrink tubing 7 and the second connector 11 is filled tightly with sealant B 16, which can improve the sealing effect between the outer sealing assembly 2 and the heat shrink tubing 7.

[0036] In this embodiment, the assembly process of the inner sealing component 1 is the same as in Embodiment 1, and will not be repeated here. The assembly process of the outer sealing component 2 is as follows: 1. Screw the first connector 10 into the pre-drilled threaded hole on the wall of the bearing housing 4 through the NPT1 / 2 external thread and fix it securely.

[0037] 2. Insert the sealing plug 13 into the heat shrink tubing 7 and embed it into the conical groove of the first connector 10.

[0038] 3. Place the first sealing gasket 14 on the outside of the sealing plug 13, tighten the second connector 11 (M24×1.5 internal thread connected to the first connector 10), and deform the sealing plug 13 by squeezing the first sealing gasket 14 to clamp the outer surface of the heat shrink tubing 7.

[0039] 4. Fill the gap between the second connector 11 and the heat shrink tubing 7 with sealant B 16, and complete the assembly after sealant B 16 has cured.

[0040] 5. Place the second sealing gasket 15 on the outside of the second connector 11, tighten the locking cap 12 (connected to the second connector 11 with an M24×1.5 external thread), and clamp the heat shrink tubing 7 a second time by squeezing the second sealing gasket 15.

[0041] The implementation principle of this embodiment is as follows: like Figure 4 As shown, the bearing thermocouple is installed on the bearing pad inside the bearing housing 4, and led to the terminal box outside the bearing housing 4 via its own temperature sensing lead 3. Lubricating oil flows into the bearing. When the shaft rotates, oil may be thrown out of the bearing housing 4. Therefore, a lubricating oil return line is installed inside the bearing housing 4 to recover the lubricating oil thrown out during unit rotation. The temperature sensing bearing thermocouple adopts a double-branch structure with four leads. In actual rotating machinery operation, the unit's lubricating oil easily leaks through the leads to the outside of the bearing housing 4 and flows to the terminal box, causing environmental pollution and oil waste. Therefore, this invention provides two sealing components: an inner sealing component 1, installed inside the bearing housing 4 in a naturally vertical arrangement, blocks oil leakage along the four leads of the thermocouple; an outer sealing component 2, installed on the wall of the bearing housing 4, blocks oil leakage along the outer surface of the heat shrink tubing 7 (which has four leads running through it). If the lubricating oil in the bearing housing 4 seeps along the outer surface of the temperature measuring lead 3, it will converge in the gap between the heat shrink tube 7 and the modified bakelite strip 5 of the inner sealing component 1. Because the component is placed vertically, the oil will flow back to the bearing housing 4 through the return hole 9 on the heat shrink tube 7 under the action of gravity. The oil that does not return will be blocked by the A sealant 6 behind the midpoint of the modified bakelite strip 5 and will not be able to penetrate to the outside.

[0042] If a small amount of oil seeps into the outer surface of the heat shrink tubing 7, it will be sealed by the sealing plug 13 of the outer sealing assembly 2, the double sealing gasket, and the silicone 16 in the gap, and will not be able to seep through the outer sealing assembly 2 to the outside of the bearing housing 4.

[0043] Through the above-mentioned dual-stage sealing and reflux design, the oil leakage of the bearing temperature measuring lead 3 is completely blocked, ensuring that there is no loss of lubricating oil and no environmental pollution during the operation of the unit.

[0044] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in the disclosed methods or processes may be combined in any way, except for mutually exclusive features and / or steps.

Claims

1. A sealing assembly for a bearing temperature sensing lead, characterized in that: The product includes a modified bakelite strip (5), A sealant (6), and heat shrink tubing (7). The modified bakelite strip (5) has multiple arc-shaped grooves (8) along its outer surface length that are adapted to the temperature measuring lead (3). The heat shrink tubing (7) is fitted onto the modified bakelite strip (5) to fix the temperature measuring lead (3) in the arc-shaped grooves (8). A sealant (6) is filled between the modified bakelite strip (5) and the heat shrink tubing (7).

2. The bearing bearing temperature sensing lead inner sealing assembly according to claim 1, characterized in that: The lower end of the heat shrink tubing (7) is flush with the lower end of the modified bakelite strip (5), and sealant A (6) is filled between the upper half of the modified bakelite strip (5) and the heat shrink tubing (7).

3. The bearing bearing temperature sensing lead inner sealing assembly according to claim 2, characterized in that: The heat shrink tubing (7) is provided with a reflux hole (9), which is located at the upper part of the lower half of the modified bakelite strip (5).

4. A double-stage sealing device for a bearing temperature sensing lead, characterized in that: It includes an inner sealing assembly (1) for vertically setting inside the bearing housing (4) and an outer sealing assembly (2) for externally fixing to the bearing housing (4). Both the inner sealing assembly (1) and the outer sealing assembly (2) are sealed to the temperature measuring lead (3). There is a heat shrink tube (7) between the inner sealing assembly (1) and the outer sealing assembly (2) that together wraps the temperature measuring lead (3). The inner sealing assembly (1) and the outer sealing assembly (2) cooperate to form a two-stage cooperative sealing structure, which respectively blocks oil leakage between the core wires of the temperature measuring lead (3) and oil leakage from the outer surface of the heat shrink tube (7).

5. The double-stage sealing device for bearing temperature sensing leads according to claim 4, characterized in that: The inner sealing assembly (1) includes a modified bakelite strip (5), A sealant (6) and a heat shrink tube (7). The modified bakelite strip (5) has an arc-shaped groove (8) along its length that is compatible with the temperature measuring lead (3). The heat shrink tube (7) is fixedly sleeved on the modified bakelite strip (5), and the temperature measuring lead (3) is sealed between the modified bakelite strip (5) and the heat shrink tube (7) by the A sealant (6). The heat shrink tube (7) has an extension section that wraps around the temperature measuring lead (3). The extension section extends out of the bearing housing (4) and is fixedly connected to the outer sealing assembly (2).

6. The double-stage sealing device for bearing temperature sensing leads according to claim 5, characterized in that: The lower end of the heat shrink tubing (7) is flush with the lower end of the modified bakelite strip (5), and sealant A (6) is filled between the upper half of the modified bakelite strip (5) and the heat shrink tubing (7).

7. The double-stage sealing device for bearing temperature sensing leads according to claim 3, characterized in that: The heat shrink tubing (7) is provided with a reflux hole (9), which is located at the upper part of the lower half of the modified bakelite strip (5).

8. A double-stage sealing device for bearing temperature sensing leads according to any one of claims 4-7, characterized in that: The external sealing assembly (2) includes a first connector (10), a second connector (11) and a locking cap (12) through which the extension section passes in sequence. The first connector (10), the second connector (11) and the locking cap (12) are fixedly connected in sequence. A sealing plug (13) and a first sealing gasket (14) for clamping and sealing the heat shrink tube (7) are fixed between the first connector (10) and the second connector (11). A second sealing gasket (15) for clamping and sealing the heat shrink tube (7) is fixed between the second connector (11) and the locking cap (12).

9. A double-stage sealing device for bearing temperature sensing leads according to claim 8, characterized in that: The outer sealing assembly (2) has a sealing area located in the connection area between the first sealing gasket (14), the second connector (11) body and the second sealing gasket (15). The heat shrink tube (7) in the sealing area and the second connector (11) body are filled with B sealant (16).

10. A double-stage sealing device for bearing temperature sensing leads according to claim 8, characterized in that: The first connector (10) has an NPT1 / 2 external thread on one side that connects to the bearing housing (4), and an M24×1.5 external thread and a tapered groove on the other side; the second connector (11) has an M24×1.5 internal thread on one side and an M24×1.5 external thread for fixing the locking cap (12) on the other side; the sealing plug (13) is a tapered fluororubber structure and is located in the tapered groove. The sealing plug (13) has a through hole inside, and the size of the through hole matches the outer diameter of the heat shrink tube (7) after wrapping the temperature measuring lead (3).

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