An online insulation detection structure for an insulating bearing device

Abstract

The present invention discloses an online insulation detection structure of an insulating bearing device, comprising an insulating end cover, an insulating bearing inner cover, an insulating bearing outer cover and a detection line, wherein the insulating end cover comprises an end cover, a steel sleeve, and a latitude-free insulating layer, the insulating bearing outer cover comprises a bearing outer cover and a first insulating plate, the bearing outer cover is provided with a through hole A and a through hole B, the through hole A can be connected to the steel sleeve, the insulating bearing inner cover comprises a bearing inner cover and a second insulating plate, one end of the detection line is electrically connected to the steel sleeve through the through hole A, the other end of the detection line is electrically connected to a joint, the joint is placed in the through hole B, there are two fixed joints, which are respectively located at the openings of the through hole A and the through hole B, and are connected to the through hole A or the through hole B. The online insulation detection structure of the insulating bearing device can detect its insulation reliability without stopping the machine.

Description

Technical Field

[0001] The invention belongs to the technical field of motor bearing structure design, and in particular relates to an online insulation detection structure of an insulating bearing device. Background Art

[0002] Rolling bearings are the type of bearings commonly used in motors due to their compact structure, low price, and easy maintenance. In some special occasions, such as areas with Exd ⅡC T4 Gb explosion-proof requirements and small motor fields, rolling bearing structures must be used.

[0003] Rolling bearing failure generally includes electrical corrosion, fatigue deformation, abrasive wear, etc. Fatigue deformation refers to the natural plastic deformation of the bearing under normal lubrication conditions, and the deformation of the raceway, inner and outer rings; abrasive wear refers to the intrusion of dust and impurities from the outside into the bearing. When the rolling element and the raceway rotate, they constantly grind the rollers and the inner and outer raceways, causing the inner and outer rings to wear and fail; bearing electrical corrosion refers to the existence of current between the inner and outer rings and rollers of the bearing. The current acts continuously on the inner and outer ring raceways and the surrounding walls in the form of arcs. The raceway surface will corrode due to the influence of high temperature, forming thousands of micro pits. As time goes by, the pits will gradually become larger and more numerous until the bearing fails. Most domestic motors use famous bearing brands such as SKF, FAG, and NSK. With the increasing reliability of bearing devices, fatigue deformation and abrasive wear are no longer the key factors for rolling bearing failure, while rolling bearing electrical corrosion is the main cause of bearing failure. Severe cases directly cause motor shaft seizure, which in turn leads to unplanned shutdown of the factory.

[0004] The online insulation detection structure of the insulated bearing device can effectively prevent electrical corrosion of the bearing. The online insulation detection structure of the insulated bearing device is generally divided into two categories: one is a normal bearing device with an insulated bearing structure; the second is an ordinary bearing with an insulating end cover and an insulating inner and outer cover structure. At present, insulated bearings are expensive in the domestic market, and not all rolling bearings have corresponding reliable insulating bearings. The manufacturing cost of insulating end covers and insulating inner and outer covers is relatively low, so the online insulation detection structure of the second type of insulated bearing device has become the main insulation measure. The reliability of the online insulation detection structure of the insulated bearing device needs to be detected by a detection device to ensure the stable operation of the motor.

[0005] In the prior art, the detection device needs to be shut down before detecting the insulating end cover, which reduces work efficiency. Summary of the invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, an embodiment of the present invention provides an online insulation detection structure of an insulating bearing device, which can detect the insulation reliability of the online insulation detection structure of the insulating bearing device online without stopping the motor.

[0008] The online insulation detection structure of the insulating bearing device according to the embodiment of the present invention comprises an insulating end cover, an insulating bearing inner cover, an insulating bearing outer cover and a detection line.

[0009] An insulating end cover, the insulating end cover comprises an end cover, a steel sleeve, and a latitude-free belt insulating layer, the end cover is sleeved on the outside of the roller bearing, the steel sleeve is arranged between the end cover and the rolling bearing, and the latitude-free belt insulating layer is arranged between the steel sleeve and the end cover;

[0010] The insulating bearing outer cover comprises a bearing outer cover and a first insulating plate, wherein the first insulating plate is fixed at the inner stop of the bearing outer cover, the insulating bearing outer cover is arranged on the left side of the insulating end cover, and stops against the insulating end cover, the bearing outer cover is provided with a through hole A and a through hole B, the first insulating plate is provided with a hole corresponding to the through hole A, and the through hole A can be connected to the steel sleeve

[0011] An insulating bearing inner cover, the insulating bearing inner cover comprises a bearing inner cover and a second insulating plate, the second insulating plate is fixed at the inner stop of the bearing inner cover, the insulating bearing inner cover is arranged on the right side of the insulating end cover and abuts against the insulating end cover;

[0012] A detection line, one end of which is electrically connected to the steel sleeve through the through hole A, and the other end of which is electrically connected to a connector, and the connector is placed in the through hole B;

[0013] There are two fixed joints, which are respectively located at the openings of the through hole A and the through hole B and are fixedly connected to the through hole A or the through hole B.

[0014] In some embodiments, the steel sleeve is provided with a mounting hole, the through hole A is connected to the mounting hole, the mounting hole is provided with a screw, and the screw is used to fix the detection line.

[0015] In some embodiments, the screw threaded portion is provided with thread fastening glue.

[0016] In some embodiments, the online insulation detection structure of the insulating bearing device is further provided with a thermal resistor, and the bearing outer cover is further provided with a temperature measuring hole, and the thermal resistor is arranged in the temperature measuring hole.

[0017] In some embodiments, the online insulation detection structure of the insulating bearing device is further provided with an oil seal, and the oil seal is arranged on the outer side of the bearing outer cover and abuts against the bearing outer cover.

[0018] In some embodiments, the online insulation detection structure of the insulating bearing device is also provided with a water retaining ring, which is arranged on the outside of the bearing outer cover and abuts against the bearing outer cover. A cavity is formed between the water retaining ring and the bearing outer cover, and the oil seal is located in the cavity.

[0019] In some embodiments, the online insulation detection structure of the insulating bearing device is further provided with an oil filling pipe, and the oil filling pipe is arranged on the side wall of the end cover.

[0020] In some embodiments, the online insulation detection structure of the insulating bearing device is further provided with an oil drain pipe, and the oil drain pipe is arranged on the side wall of the end cover.

[0021] In some embodiments, the online insulation detection structure of the insulating bearing device is further provided with an oil slinger, and the oil slinger is arranged in the bearing outer cover and abuts against the rolling bearing.

[0022] Beneficial effects:

[0023] 1. The online insulation detection structure of the insulating bearing device of the present invention can detect the insulation reliability of the online insulation detection structure of the insulating bearing device without stopping the machine. At the same time, the device has a simple structure and is detachable, which is convenient for inspection and maintenance.

[0024] 2. Use thread fastening glue to ensure that the connection between the detection line and the screw is tight and not loose.

[0025] 3. Setting a thermal resistor can detect the temperature of the online insulation detection structure of the insulating bearing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of an online insulation detection structure of an insulating bearing device according to an embodiment of the present invention;

[0027] Figure 2 A side view of an online insulation detection structure of an insulating bearing device according to an embodiment of the present invention;

[0028] Figure 3 It is a partial cross-sectional view of the online insulation detection structure of the insulating bearing device according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Insulating end cover 1; end cover 101; non-weft tape insulation layer 102; steel sleeve 103; insulating bearing outer cover 2; bearing outer cover 201; first insulating plate 202; insulating bearing inner cover 3; bearing inner cover 301; second insulating plate 302; detection line 4; fixing joint 5; screw 6; thermal resistor 7; oil seal 8; water retaining ring 9; oil filling pipe 10; oil drain pipe 11; oil throwing ring 12. DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0032] The online insulation detection structure of the insulating bearing device of the embodiment of the present invention comprises an insulating end cover, an insulating bearing inner cover, an insulating outer cover and a detection line.

[0033] Specifically, Figures 1 to 3 As shown, the insulating end cap 1 includes an end cap 101, a latitude belt insulation layer 102 and a steel sleeve 103. The steel sleeve 103 is sleeved on the outside of the rolling bearing, and a toothed groove is provided on the steel sleeve 103. The latitude belt insulation layer 102 is fixed in the toothed groove. The end cap 101 is sleeved on the outside of the steel sleeve 103, and the end cap 101 and the latitude belt insulation layer 102 are in contact.

[0034] The insulating bearing outer cover 2 includes a bearing outer cover 201 and a first insulating plate 202. The bearing outer cover 201 is located on the left side of the insulating end cover 1. The first insulating plate 202 is provided between the bearing outer cover 201 and the insulating end cover 1. The two ends of the first insulating plate 202 are respectively stopped at the bearing outer cover 201 and the steel sleeve 103.

[0035] The insulating bearing inner cover 3 includes a bearing inner cover 301 and a second insulating plate 302. The bearing inner cover 301 is located on the right side of the insulating end cover 1. The second insulating plate 302 is provided between the bearing inner cover 301 and the insulating end cover 1. The two ends of the second insulating plate 302 are respectively abutted against the bearing inner cover 301 and the steel sleeve 103.

[0036] The two ends of the latitude-free insulating layer 102 are respectively stopped against the first insulating plate 202 and the second insulating plate 302. The latitude-free insulating layer 102, the first insulating plate 202 and the second insulating plate 302 isolate the steel sleeve 103 from the end cover 101, the bearing outer cover 201 and the bearing inner cover 301. The bearing outer cover 201 is provided with a through hole A and a through hole B, and the through hole A and the through hole B are symmetrically distributed about the center of the bearing outer cover. The first insulating plate 202 is provided with a hole coaxial and with the same diameter as the through hole A, and the steel sleeve 103 is provided with a mounting hole coaxial and with the same diameter as the through hole A.

[0037] The detection line 4 can be an insulated detection line. One end of the detection line 4 passes through the through hole A and is electrically connected to the steel sleeve. The detection line A is fixed to the steel sleeve by a screw 6. The threaded part of the screw 6 is also provided with a thread fastener. The other end of the detection line 4 is electrically connected to the connector. The connector can be an OT connector. The OT connector is placed in the through hole B. The openings of the through hole A and the through hole B are both provided with a fixed connector. The fixed connector can be a Glen head. The fixed connector is detachably connected to the opening of the through hole A or the through hole BD.

[0038] The bearing outer cover 201 is also provided with a thermal resistor, which may be an end-face platinum thermal resistor 7. The end-face platinum thermal resistor may be arranged in a hole at other positions of the bearing outer cover for measuring temperature.

[0039] A water retaining ring 9 is also provided, which is arranged on the right side of the bearing outer cover 201 and abuts against the bearing outer cover 201. The bearing outer cover 201 has an annular groove, in which an oil seal 8 is provided, and the oil seal is located between the water retaining ring 9 and the bearing outer cover 201. An oil slinger 12 is provided in the bearing outer cover, and the oil slinger 12 abuts against the rolling bearing. A retaining ring is also provided, which is provided in the bearing outer cover 201, located on the right side of the oil slinger 12, and abuts against the oil slinger 12. An oil filling pipe 10 and an oil drain pipe 11 are provided on the end cover, and the oil filling pipe 10 and the oil drain pipe 11 are symmetrically distributed relative to the center of the end cover.

[0040] According to the online insulation detection structure of the insulating bearing device of the embodiment of the present invention, the online insulation detection structure of the insulating bearing device does not rotate when the shaft drives the bearing to rotate, so the insulation reliability can be detected without stopping the machine. When detecting the insulation reliability of the device, first remove the Glenn connector at the through hole B, take out the OT connector, electrically connect one end of the ammeter to the OT connector, insert the other end of the ammeter into the through hole B, and determine the insulation reliability of the device based on the reading of the ammeter.

[0041] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "left", "right", "front", "back", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

Claims

1. An online insulation detection structure for an insulating bearing device, characterized in that: include: An insulating end cover, the insulating end cover comprises an end cover, a steel sleeve, and a latitude-free belt insulating layer, the end cover is sleeved on the outside of the roller bearing, the steel sleeve is arranged between the end cover and the rolling bearing, and the latitude-free belt insulating layer is arranged between the steel sleeve and the end cover; An insulating bearing outer cover, the insulating bearing outer cover comprises a bearing outer cover and a first insulating plate, the first insulating plate is fixed at the inner stop of the bearing outer cover, the insulating bearing outer cover is arranged on the left side of the insulating end cover, and abuts against the insulating end cover, the bearing outer cover is provided with a through hole A and a through hole B, the first insulating plate is provided with a hole corresponding to the through hole A, and the through hole A can be connected to the steel sleeve; An insulating bearing inner cover, the insulating bearing inner cover comprises a bearing inner cover and a second insulating plate, the second insulating plate is fixed at the inner stop of the bearing inner cover, the insulating bearing inner cover is arranged on the right side of the insulating end cover and abuts against the insulating end cover; A detection line, one end of which is electrically connected to the steel sleeve through the through hole A, and the other end of which is electrically connected to a connector, and the connector is placed in the through hole B; Fixed joints, there are two fixed joints, which are respectively located at the openings of the through hole A and the through hole B and are fixedly connected to the through hole A or the through hole B; The steel sleeve is provided with a mounting hole, the through hole A is connected to the mounting hole, a screw is provided in the mounting hole, and the screw is used to fix the detection line; A thermal resistor is also provided, and a temperature measuring hole is also provided on the bearing outer cover, and the thermal resistor is arranged in the temperature measuring hole.

2. The online insulation detection structure of the insulating bearing device according to claim 1 is characterized in that: The screw thread portion is provided with thread fastening glue.

3. The online insulation detection structure of the insulating bearing device according to claim 1, characterized in that: An oil seal is also provided, which is arranged on the outer side of the bearing outer cover and abuts against the bearing outer cover.

4. The online insulation detection structure of the insulating bearing device according to claim 3 is characterized in that: A water retaining ring is also provided. The water retaining ring is arranged on the outer side of the bearing outer cover and abuts against the bearing outer cover. A cavity is formed between the water retaining ring and the bearing outer cover, and the oil seal is located in the cavity.

5. The online insulation detection structure of the insulating bearing device according to claim 1, characterized in that: An oil filling pipe is also provided, and the oil filling pipe is arranged on the side wall of the end cover.

6. The online insulation detection structure of the insulating bearing device according to claim 1, characterized in that: An oil drain pipe is also provided, and the oil drain pipe is arranged on the side wall of the end cover.

7. The online insulation detection structure of the insulating bearing device according to claim 1, characterized in that: An oil slinger is also provided, which is arranged in the bearing outer cover and abuts against the rolling bearing.

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