An anti-electrical corrosion mechanism for motor bearing

Abstract

The present invention relates to the technical field of motor anti-electrocorrosion. The present invention discloses an anti-electrocorrosion mechanism for motor bearings, including a motor, wherein the motor has a shell and a bottom cover that match each other, a first bearing cover is fixed on the outer side of the shell, a second bearing cover is integrally formed on the outer side of the bottom cover, and matching bearings are limited inside the first bearing cover and the second bearing cover; a conduction mechanism is provided between the shell and the bottom cover, and the conduction mechanism is used to reduce the risk of the matching bearings being corroded by electricity; a conduction matching part is provided on the outer side of the two matching bearings, and lubricating oil is contained in the conduction matching part. The present invention causes the lubricating oil at the lower end of the rectangular block to enter the annular groove and contact the matching bearing by rotating the shaft, thereby blocking the current from passing through the bearing raceway and avoiding the shaft voltage from breaking through the lubricating film and causing discharge; the vibration of the motor causes the lubricating oil in the annular groove to be replaced, ensuring that a continuously updated lubricating film is formed on the surface of the rotating element to avoid the degradation of the insulation performance.

Description

Technical Field

[0001] The invention relates to the technical field of motor anti-electrocorrosion, in particular to an anti-electrocorrosion mechanism for a motor bearing. Background Art

[0002] During the operation of the motor, due to electromagnetic induction, static electricity accumulation or high-frequency inverter drive and other factors, shaft voltage is easily generated between the rotating shaft and the bearing. When the voltage exceeds the insulation limit of the lubricating oil film, a discharge circuit will be formed through the inner and outer rings of the bearing and the rolling elements, causing electrical corrosion. This discharge will cause micro-pits on the bearing raceway and steel ball surfaces, accelerate wear and cause vibration and noise, and eventually cause the bearing to fail prematurely. According to statistics, electrical corrosion is the main reason for shortening the bearing life of high-speed variable frequency motors by 30%-50%.

[0003] The existing anti-electrocorrosion technologies are as follows:

[0004] 1. Block the current path by setting an insulating layer (such as Teflon block, ceramic coating, etc.) between the bearing and the motor shaft.

[0005] 2. Guide the shaft current to the ground terminal through the conductive component.

[0006] 3. Combine insulation and conductive design.

[0007] Based on the above solutions, there are still certain defects. The multi-layer insulation / conductive components make installation difficult and may affect the heat dissipation performance of the bearing.

[0008] In view of the above problems, this patent proposes an anti-electrocorrosion mechanism for motor bearings. Summary of the invention

[0009] The object of the present invention is to provide an anti-electrocorrosion mechanism for a motor bearing to solve the problems raised in the above background technology.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: an anti-electric corrosion mechanism for a motor bearing, comprising a motor, the motor having a shell and a bottom cover that match each other, a first bearing cover fixed to the outer side of the shell, a second bearing cover integrally formed on the outer side of the bottom cover, and matching bearings limited in the first bearing cover and the second bearing cover;

[0011] A conducting mechanism is provided between the housing and the bottom cover, and the conducting mechanism is used to reduce the risk of electrical corrosion of the mating bearing;

[0012] The outer sides of the two matching bearings are each provided with a conductive matching portion, and the conductive matching portion contains lubricating oil. When the motor is running, the conductive matching portion can replace the lubricating oil in the matching bearings.

[0013] Furthermore, the first bearing cover, the second bearing cover and the bottom cover are all made of metal, and the shell is a BMC plastic-sealed structure.

[0014] Furthermore, the lower end of the shell is buckled with the bottom cover, and an embedding groove is provided on the outer side of the shell;

[0015] The conduction mechanism includes a conduction pin and a conduction terminal. The conduction pin is embedded in the embedding groove. The conduction terminal is fixed at one end of the conduction pin to fix the conduction pin to the shell. The conduction pin contacts the first bearing cover. The other end of the conduction pin is buckled with the edge of the shell and the outer side contacts the bottom cover to reduce the shaft current.

[0016] Furthermore, a stator and a rotor are installed in the outer shell and the bottom cover, a rotating shaft is provided in the rotor, and an insulator is filled between the rotating shaft and the rotor.

[0017] Furthermore, an inner bearing cover with an opening facing upward is fixed inside the first bearing cover, and the two conducting fitting parts are respectively located inside the inner bearing cover and the second bearing cover.

[0018] Furthermore, the conductive matching part includes an inner shaft, a rectangular block, a support spring, a matching point and an inner sleeve body;

[0019] The inner bearing cover and the second bearing cover are both provided with an annular groove and a multi-petal fan-shaped opening, the annular groove and the multi-petal fan-shaped opening are connected, the cross-section of the fan-shaped opening is "L"-shaped, and there are multiple groups of evenly distributed inner shaft rods inside, the ends of the inner shaft rods are flush with the connection between the annular groove and the fan-shaped opening, the multiple groups of inner shaft rods divide the fan-shaped opening into multiple chambers, the multiple rectangular blocks slide in the multiple chambers respectively, the support spring is used to connect the rectangular blocks and the horizontal inner walls of the fan-shaped opening, the inner sleeve body has two, the two inner sleeve bodies are respectively clamped in the inner bearing cover and the second bearing cover, for closing the fan-shaped opening, the matching bearing is limited in the inner sleeve body, the rectangular block divides the chamber into two parts, the lower part is lubricating oil, and the upper part is gas. When the motor is working, heat is generated to drive the gas to expand, so that the rectangular block moves downward and pushes the lubricating oil to contact the matching bearing.

[0020] Furthermore, the inner sleeve body has a side ring and a bottom ring, the side ring and the bottom ring are integrated, the side ring is used to seal the vertical part of the fan-shaped opening, and the bottom ring is used to seal the horizontal part of the fan-shaped opening.

[0021] Furthermore, a matching hole is provided on the bottom ring, and matching points are fixed in the inner bearing cover and the second bearing cover, and the matching points match with the matching holes.

[0022] Furthermore, a first oil change port and a second oil change port are respectively provided on the outer sides of the first bearing cover and the second bearing cover, both of which are used to replace the lubricating oil in the conductive matching part.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention connects the outer core of the rotor and the shaft with insulating material, and the bearing covers on both sides of the motor are connected and conductive, which greatly reduces the risk of electrical corrosion of the mating bearings. When the motor is running, the shaft rotates to allow the lubricating oil at the lower end of the rectangular block to enter the annular groove and contact the mating bearing, blocking the current from passing through the bearing raceway and preventing the shaft voltage from breaking through the lubricating film and causing discharge; the motor vibrates to replace the lubricating oil in the annular groove, ensuring that a continuously renewed lubricating film is formed on the surface of the rotating element to avoid a decrease in insulation performance. Effectively reduce shaft current generation and avoid electrical corrosion of bearings. Reduce performance degradation caused by bearing damage, ensure long-term stable output power of the motor, improve the cooling or heating efficiency of the air-conditioning system, accurately maintain the set temperature, perform excellently in high-load operation, and greatly improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the separation structure of the housing and the bottom cover of the present invention;

[0027] Figure 3 This is a schematic diagram of a half-section structure of the housing and bottom cover of the present invention;

[0028] Figure 4 It is a schematic diagram of the stator and rotor structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the partial explosion structure of the conductive matching part of the present invention;

[0030] Figure 6 The present invention Figure 5 A is a schematic diagram of the partially enlarged structure of the middle part;

[0031] Figure 7 It is a schematic diagram of the matching structure of the inner shaft rod and the inner sleeve body of the present invention;

[0032] Figure 8 This is a schematic diagram of the installation position structure of the inner bearing cover inside the housing of the present invention;

[0033] Fig. 9 It is a schematic diagram of the outer structure of the bottom cover of the present invention.

[0034] In the figure: 1, outer shell; 11, first bearing cover; 12, embedding groove; 13, first oil change port; 14, inner bearing cover; 2, bottom cover; 21, second bearing cover; 22, second oil change port; 3, conduction mechanism; 31, conduction needle; 32, conduction terminal; 4, rotating shaft; 5, stator; 6, rotor; 7, insulator; 8, matching bearing; 9, conduction matching part; 91, annular groove; 92, fan-shaped mouth; 93, inner shaft rod; 94, rectangular block; 95, support spring; 96, matching point; 97, inner sleeve; 971, side ring; 972, bottom ring; 973, matching hole. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 9 The present invention provides a technical solution: an anti-electric corrosion mechanism for a motor bearing, comprising a motor, the motor having a housing 1 and a bottom cover 2 that cooperate with each other, a first bearing cover 11 fixed to the outer side of the housing 1, a second bearing cover 21 integrally formed on the outer side of the bottom cover 2, and matching bearings 8 are limited in the first bearing cover 11 and the second bearing cover 21;

[0037] A conducting mechanism 3 is provided between the housing 1 and the bottom cover 2, and the conducting mechanism 3 is used to reduce the risk of electrical corrosion of the mating bearing 8;

[0038] The outer sides of the two matching bearings 8 are both provided with a conducting matching portion 9 , and the conducting matching portion 9 contains lubricating oil. When the motor is running, the conducting matching portion 9 can replace the lubricating oil in the matching bearings 8 .

[0039] The first bearing cover 11 , the second bearing cover 21 and the bottom cover 2 are all made of metal, and the housing 1 is a BMC plastic-sealed structure.

[0040] Specifically, the motor has a housing 1 and a bottom cover 2, the housing 1 and the bottom cover 2 are buckled together, the matching bearing 8 is installed in the first bearing cover 11 and the second bearing cover 21, and the conductive matching part 9 is used to connect the bottom cover 2 and the first bearing cover 11 to achieve conductive contact between the matching bearings 8 at both ends, so that the shaft voltage is small, thereby reducing the effect of electrical corrosion. Compared with the traditional iron shell, the motor housing 1 with a BMC plastic sealing structure has better insulation performance and corrosion resistance. The housing 1 is a BMC plastic sealing structure, which can improve the safety and reliability of the motor and extend the service life of the motor.

[0041] The lower end of the housing 1 is buckled with the bottom cover 2, and an embedding groove 12 is provided on the outer side of the housing 1;

[0042] The conduction mechanism 3 includes a conduction needle 31 and a conduction terminal 32. The conduction needle 31 is embedded in the embedding groove 12. The conduction terminal 32 is fixed at one end of the conduction needle 31 and is used to fix the conduction needle 31 to the shell 1. The conduction needle 31 contacts the first bearing cover 11. The other end of the conduction needle 31 is buckled with the edge of the shell 1, and the outer side contacts the bottom cover 2 to reduce the shaft current.

[0043] Specifically, one end of the conduction pin 31 is fixed by the conduction terminal 32 , and the other end is buckled with the housing 1 , so as to facilitate the connection of the conduction mechanism 3 and reduce the shaft current.

[0044] The stator 5 and the rotor 6 are installed in the housing 1 and the bottom cover 2. The rotor 6 has a rotating shaft 4. An insulator 7 is filled between the rotating shaft 4 and the rotor 6.

[0045] Specifically, the insulator 7 is made of zirconia ceramic or LCP plastic, and is inserted between the rotating shaft 4 and the rotor 6 to directly cut off the conductive path between the metal parts. When the motor is running, the high resistance characteristic of the insulator 7 effectively prevents the current from passing through, thereby avoiding electrical corrosion.

[0046] An inner bearing cover 14 with an opening facing upward is fixed inside the first bearing cover 11, and two conducting mating parts 9 are respectively located inside the inner bearing cover 14 and the second bearing cover 21;

[0047] Specifically, the conductive mating portion 9 is used to further reduce the effect of electrical corrosion and reduce the corrosion effect of the mating bearing 8.

[0048] The conductive mating part 9 includes an inner shaft 93, a rectangular block 94, a support spring 95, a mating point 96 and an inner sleeve body 97;

[0049] The inner bearing cover 14 and the second bearing cover 21 are both provided with an annular groove 91 and a multi-petal fan-shaped opening 92, the annular groove 91 and the multi-petal fan-shaped opening 92 are connected, the fan-shaped opening 92 has an "L"-shaped cross section, and has multiple sets of evenly distributed inner shaft rods 93 inside, the ends of the inner shaft rods 93 are flush with the connection between the annular groove 91 and the fan-shaped opening 92, and the multiple sets of inner shaft rods 93 divide the fan-shaped opening 92 into multiple chambers, and multiple rectangular blocks 94 slide in the multiple chambers respectively, and the support spring 95 is used to connect the rectangular blocks 94. The inner wall of the rectangular block 94 and the sector-shaped opening 92 is horizontal, and the inner sleeve 97 has two inner sleeves 97, which are respectively clamped in the inner bearing cover 14 and the second bearing cover 21, and are used to close the sector-shaped opening 92, and the matching bearing 8 is limited in the inner sleeve 97. The rectangular block 94 divides the chamber into two parts, the lower part is lubricating oil, and the upper part is gas. When the motor is working, heat is generated to drive the gas to expand, so that the rectangular block 94 moves downward and pushes the lubricating oil to contact the matching bearing 8;

[0050] Specifically, during the operation of the motor, the multi-petal fan-shaped opening 92 is sealed by the inner sleeve 97, but the multi-petal fan-shaped opening 92 is in a connected state with the annular groove 91. Therefore, when the temperature of the mating bearing 8 rises, the gas in the upper chamber can be heated to cause the gas to expand, so that the lubricating oil in the lower chamber enters the annular groove 91 and makes the lubricating oil contact with the mating bearing 8, thereby completing the lubrication of the mating bearing 8 and realizing the lubrication barrier function, chemical protection mechanism and environmental isolation function. In addition, since the motor will vibrate, the rectangular block 94 supported by the support spring 95 will cause local movement in the up and down directions, so that the lower chamber pushes the lubricating oil and absorbs the lubricating oil, thereby realizing the replacement of the lubricating oil. This alternating lubrication ensures the formation of a continuous lubricating film on the surface of the rotating element of the mating bearing 8, and renews the lubricating film, thereby avoiding the degradation of insulation performance due to aging or contamination of the lubricant.

[0051] The inner sleeve 97 has a side ring 971 and a bottom ring 972. The side ring 971 and the bottom ring 972 are integrated. The side ring 971 is used to seal the vertical part of the sector-shaped opening 92, and the bottom ring 972 is used to seal the horizontal part of the sector-shaped opening 92.

[0052] Specifically, the inner casing 97 is in two parts, and the longitudinal and transverse openings of the fan-shaped opening 92 are closed, so that the gas in the chamber can expand.

[0053] A matching hole 973 is formed on the bottom ring 972, and matching points 96 are fixed in the inner bearing cover 14 and the second bearing cover 21. The matching points 96 match with the matching holes 973 to prevent the inner sleeve body 97 from rotating, thereby increasing stability.

[0054] A first oil change port 13 and a second oil change port 22 are respectively provided on the outer sides of the first bearing cover 11 and the second bearing cover 21, both of which are used to replace the lubricating oil in the conductive matching part 9, and can replace the lubricating oil in the motor to facilitate subsequent maintenance.

[0055] The working principle of the present invention is as follows: the first bearing cover 11 and the second bearing cover 21 on both sides of the motor are connected in a conductive manner through the conducting mechanism 3, and the outer iron core of the rotor 6 and the rotating shaft 4 are filled and connected with insulating material, which greatly reduces the risk of electrical corrosion of the mating bearing 8.

[0056] Secondly, when the motor is running, the shaft 4 rotates, causing the matching bearing 8 to generate heat. Therefore, the air in the upper part of the rectangular block 94 is in an expanded state. When the temperature rises by 10°C, the volume of the air will increase by about 3.67%. Then the lubricating oil in the lower part of the rectangular block 94 is pushed to enter the annular groove 91 and contact the matching bearing 8 to achieve the lubrication barrier function, chemical protection mechanism and environmental isolation function. The oil film formed by the lubricating oil can block the current from passing through the bearing raceway, preventing the shaft voltage from breaking through the lubricating film and causing discharge. Some lubricating oils contain rust-proof ingredients such as sulfonates, which can form a protective film on the metal surface to inhibit electrochemical reactions. Grease can seal the bearing, reduce the intrusion of conductive media such as moisture and salt spray, reduce the possibility of electrolyte formation, and reduce the possibility of electrical corrosion of the matching bearing 8.

[0057] In addition, local vibrations are bound to occur during the operation of the motor, which will cause the rectangular block 94 to squeeze the support spring 95 and also cause the support spring 95 to recover, causing the rectangular block 94 to produce local up and down movement. Based on this, the lubricating oil in the annular groove 91 is replaced. This alternating lubrication ensures the formation of a continuous lubricating film on the surface of the rotating element of the mating bearing 8, and renews the lubricating film to avoid degradation of insulation performance due to aging or contamination of the lubricant.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-electric corrosion mechanism for a motor bearing, characterized in that: The motor comprises a housing (1) and a bottom cover (2) which cooperate with each other, a first bearing cover (11) being fixed to the outer side of the housing (1), a second bearing cover (21) being integrally formed on the outer side of the bottom cover (2), and matching bearings (8) being limited in position in both the first bearing cover (11) and the second bearing cover (21); A conduction mechanism (3) is provided between the housing (1) and the bottom cover (2), and the conduction mechanism (3) is used to reduce the risk of electrical corrosion of the mating bearing (8); The outer sides of the two matching bearings (8) are each provided with a conducting matching portion (9), the conducting matching portion (9) having lubricating oil therein, and when the motor is running, the conducting matching portion (9) can replace the lubricating oil in the matching bearings (8); An inner bearing cover (14) with an opening facing upward is fixed inside the first bearing cover (11), and the two conducting matching portions (9) are respectively located inside the inner bearing cover (14) and the second bearing cover (21); The conductive matching portion (9) comprises an inner shaft (93), a rectangular block (94), a support spring (95), a matching point (96) and an inner sleeve body (97); The inner bearing cover (14) and the second bearing cover (21) are both provided with an annular groove (91) and a multi-petal fan-shaped opening (92). The annular groove (91) and the multi-petal fan-shaped opening (92) are connected. The fan-shaped opening (92) has an "L"-shaped cross section and has a plurality of groups of evenly distributed inner shaft rods (93) inside. The ends of the inner shaft rods (93) are flush with the connection between the annular groove (91) and the fan-shaped opening (92). The plurality of groups of inner shaft rods (93) divide the fan-shaped opening (92) into a plurality of chambers. The plurality of rectangular blocks (94) slide in the plurality of chambers respectively. The support spring (9 5) an inner wall horizontally connecting the rectangular block (94) and the fan-shaped opening (92), the inner sleeve (97) having two parts, the two inner sleeves (97) being respectively clamped in the inner bearing cover (14) and the second bearing cover (21), and being used to close the fan-shaped opening (92), the matching bearing (8) being limited in the inner sleeve (97), the rectangular block (94) dividing the chamber into upper and lower parts, the lower part being lubricating oil, and the upper part being gas, when the motor is working, heat is generated to drive the gas to expand, so that the rectangular block (94) moves downward and pushes the lubricating oil to contact the matching bearing (8).

2. The anti-electrocorrosion mechanism for motor bearings according to claim 1, characterized in that: The first bearing cover (11), the second bearing cover (21) and the bottom cover (2) are all made of metal, and the housing (1) is a BMC plastic-sealed structure.

3. The anti-electrocorrosion mechanism for motor bearings according to claim 1, characterized in that: The lower end of the outer shell (1) is buckled with the bottom cover (2), and an embedding groove (12) is provided on the outer side of the outer shell (1); The conduction mechanism (3) comprises a conduction pin (31) and a conduction terminal (32); the conduction pin (31) is embedded in the embedding groove (12); the conduction terminal (32) is fixed to one end of the conduction pin (31) and is used to fix the conduction pin (31) to the housing (1); the conduction pin (31) is in contact with the first bearing cover (11); the other end of the conduction pin (31) is buckled with the edge of the housing (1) and the outer side is in contact with the bottom cover (2) to reduce the shaft current.

4. The anti-electrocorrosion mechanism for motor bearings according to claim 1, characterized in that: A stator (5) and a rotor (6) are installed in the housing (1) and the bottom cover (2); a rotating shaft (4) is provided in the rotor (6); and an insulator (7) is filled between the rotating shaft (4) and the rotor (6).

5. The anti-electrical corrosion mechanism of the motor bearing according to claim 1, characterized in that: The inner sleeve (97) comprises a side ring (971) and a bottom ring (972), wherein the side ring (971) and the bottom ring (972) are integrally formed, the side ring (971) is used to seal the vertical portion of the fan-shaped opening (92), and the bottom ring (972) is used to seal the horizontal portion of the fan-shaped opening (92).

6. The anti-electrocorrosion mechanism for motor bearings according to claim 5, characterized in that: A matching hole (973) is provided on the bottom ring (972), and matching points (96) are fixed inside the inner bearing cover (14) and the second bearing cover (21), and the matching points (96) match with the matching holes (973).

7. The anti-electrical corrosion mechanism of the motor bearing according to claim 1, characterized in that: A first oil change port (13) and a second oil change port (22) are respectively provided on the outside of the first bearing cover (11) and the second bearing cover (21), both of which are used to replace the lubricating oil in the conductive matching portion (9).

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