Dedicated deep groove ball bearing for variable frequency motor

Abstract

The utility model provides a special deep groove ball bearing for a variable frequency motor, belongs to the technical field of variable frequency motors, and aims to solve the problems of water vapor invasion, lubricating grease deterioration and corrosion caused by sealing failure and difficulty in observation due to vibration, aging and corrosion of the conventional deep groove ball bearing. Comprising a bearing outer ring, a bearing inner ring, a retainer, a rolling body, a deep groove raceway, a sealing sleeve, a groove assembly and a maintenance assembly, and the bearing inner ring is arranged in the bearing outer ring; the retainer is arranged between the bearing outer ring and the bearing inner ring; the rolling body is arranged in the retainer; the deep groove raceway is formed in the inner side of the bearing outer ring, and the deep groove raceway is formed in the outer side of the bearing inner ring; the sealing sleeves are in interference fit with the front and rear sides of the bearing outer ring; the groove assembly is arranged in the bearing outer ring; and the maintenance assembly is arranged in the sealing sleeve. The lubricating device has the advantages of uniform lubrication, visual monitoring, timely detection and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of variable frequency motor, more specifically, it is especially related to the deep groove ball bearing special for variable frequency motor. BACKGROUND

[0002] At present, variable frequency motor is increasingly widely used in industrial field. As a key component in variable frequency motor, the performance of deep groove ball bearing directly affects the operation effect of variable frequency motor. The existing deep groove ball bearing is mainly composed of inner ring, outer ring, rolling body, retainer and sealing sleeve, the inner ring is tightly matched with motor rotating shaft, the outer ring is fixed in bearing seat, and the inner walls of the two are provided with arc deep grooves; the rolling body circulates and rolls in the deep grooves; the retainer separates and guides the rolling body to be uniformly distributed to avoid mutual collision; the sealing sleeve effectively isolates external impurities and moisture through lip or labyrinth structure, and simultaneously prevents internal lubricating grease from leaking.

[0003] The utility model of the present application relates to bearing technical field, and discloses a kind of deep groove ball bearing for motor, including first stainless steel inner core, the outer wall of first stainless steel inner core is fixedly connected with first alumina ceramic layer, the inner wall of first stainless steel inner core is fixedly connected with second titanium alloy layer, the inner chamber of second titanium alloy layer is provided with second stainless steel inner core, the outer wall of second stainless steel inner core is fixedly connected with second alumina ceramic layer, the inner wall of second stainless steel inner core is fixedly connected with first titanium alloy layer.The deep groove ball bearing for motor of the utility model, high wear resistance and long life, effectively prolong the service life and maintenance cycle of motor, good heat management ability, prevent bearing overheating failure, ensure the stable operation of motor;High precision and dynamic balance design, reduce vibration and noise, improve the running stability of motor;Excellent sealing and lubricating performance, prevent external impurities from entering, ensure the cleanliness and stable operation of bearing.

[0004] Based on the above, the existing deep groove ball bearing is easily sealed failure by mechanical vibration, high temperature aging or chemical corrosion and other factors. The slight damage or aging of initial sealing sleeve is usually difficult to detect, however, with the passage of time, external humid air and moisture will continue to penetrate into the bearing, causing the emulsification and deterioration of lubricating oil, and then accelerating the rusting process of bearing inner ring, outer ring and rolling body. Moreover, under the condition of lack of lubricating oil in the bearing, uneven distribution of lubricating oil is easily caused by centrifugal force. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides special deep groove ball bearing of frequency conversion motor to solve the existing deep groove ball bearing, is affected by mechanical vibration, high temperature ageing or chemical corrosion and so on factor, easily appears sealing failure problem. The slight breakage or ageing of initial sealing cover is usually difficult to detect, however with time goes by, the outside humid air and moisture will continue to infiltrate into the bearing interior, cause the emulsification metamorphosis of lubricating grease, and then accelerate the rusting process of bearing inner race, outer race and rolling element. Moreover, under the condition of lacking lubricating grease in the bearing interior, uneven distribution of lubricating grease is prone to be caused by centrifugal force.

[0006] The purpose and function of the deep groove ball bearing special for frequency conversion motor of the utility model are achieved by the following specific technical means:

[0007] The deep groove ball bearing special for frequency conversion motor, including bearing outer ring, bearing inner race, retainer, rolling element, deep groove raceway, sealing cover, groove assembly and maintenance assembly, the bearing inner race is arranged inside the bearing outer ring, the retainer is arranged between the bearing outer ring and the bearing inner race, the rolling element is arranged inside the retainer, the deep groove raceway is arranged in the inside of the bearing outer ring, the deep groove raceway is arranged on the outside of the bearing inner race, the sealing cover is interference fit on the front and rear sides of the bearing outer ring, the groove assembly is arranged inside the bearing outer ring, and the maintenance assembly is arranged inside the sealing cover.

[0008] Further, the groove assembly includes a ceramic insulating coating and a rivet, the ceramic insulating coating is coated on the outside of the bearing outer ring, and the rivet is provided with multiple groups, and the multiple groups of rivets are circumferentially arranged inside the retainer.

[0009] Further, the groove assembly further includes a through hole and an arc-shaped groove, the through hole is provided with multiple groups, and the multiple groups of through holes are arranged inside the retainer, and the arc-shaped groove is provided with multiple groups, and the multiple groups of arc-shaped grooves are arranged on the inside of the retainer, and the arc-shaped groove and the through hole are communicated with each other.

[0010] Further, the groove assembly further includes a circular arc chamfer, and the circular arc chamfer is arranged on the outside of the multiple groups of arc-shaped grooves.

[0011] Further, the maintenance assembly includes a reaction tank, the reaction tank is fixedly installed inside the sealing cover, and the reaction tank is filled with color-changing silica gel.

[0012] Further, the maintenance assembly further includes a transparent window and a microfiltration membrane, the transparent window is fixedly installed on the front side of the reaction tank, and the microfiltration membrane is fixedly installed on the rear side of the reaction tank.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] First, the utility model has the groove assembly, through the ceramic insulation coating in bearing outer ring outside cladding, effective blocking shaft current, form double insulation protection in combination silicon nitride ceramic rolling element, avoid electric erosion damage, prolong the bearing life. Meanwhile, single outer ring coating design reduces cost and process difficulty, does not influence assembly adaptability. The through hole and the arc groove on the retainer are in communication with each other, the through hole enhances heat dissipation, the arc groove traps lubricating grease, cooperates with the outside arc chamfer, ensures the uniform distribution of grease, reduces the wear of rolling element, improves the running stability and lubrication effect of bearing.

[0015] Second, the utility model has the maintenance assembly, through the collaborative design of reaction tank, transparent window and microfiltration membrane, realize early warning of sealing failure. The microfiltration membrane allows only water vapor to enter the reaction tank by virtue of the oil-repellent and water-attracting characteristics, and intercepts lubricating grease. The discoloring silica gel filled in the tank intuitively reflects the water vapor content through color change, and the operator can quickly judge the humidity inside the bearing through the transparent window, timely find the sealing sleeve failure problem, avoid the lubricating grease emulsification, bearing corrosion and other faults caused by water vapor infiltration.

[0016] The utility model has the advantages of uniform lubrication, visual monitoring, timely detection, etc., improves the insulation performance, lubrication effect and running stability of the bearing, realizes the visual monitoring of the sealing state, reduces the equipment maintenance cost and fault risk, and provides reliable protection for the stable operation of the variable frequency motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the main structure schematic diagram of the utility model.

[0018] Figure 2 It is the ceramic insulation coating structure schematic diagram of the utility model.

[0019] Figure 3 It is the rolling element structure schematic diagram of the utility model.

[0020] Figure 4 It is the retainer structure schematic diagram of the utility model.

[0021] Figure 5 It is the reaction tank structure schematic diagram of the utility model.

[0022] In the drawing, the corresponding relationship of component name and drawing number is as follows:

[0023] 1, bearing outer ring;101, ceramic insulation coating;2, bearing inner ring;3, retainer;301, rivet;302, through hole;303, arc groove;304, arc chamfer;4, rolling element;5, deep groove raceway;6, sealing sleeve;601, reaction tank;602, transparent window;603, microfiltration membrane. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be further described in detail below with reference to the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0025] Example 1: as shown in the accompanying drawings Figure 1 to the accompanying drawings Figure 5 :

[0026] The utility model provides a special deep groove ball bearing of frequency conversion motor, including bearing outer ring 1, bearing inner ring 2, retainer 3, rolling element 4, deep groove raceway 5, sealing sleeve 6 and groove assembly, bearing inner ring 2 sets up inside bearing outer ring 1, retainer 3 sets up between bearing outer ring 1 and bearing inner ring 2, rolling element 4 sets up inside retainer 3, deep groove raceway 5 is set up in bearing outer ring 1 inside, and deep groove raceway 5 is set up in bearing inner ring 2 outside, sealing sleeve 6 is interference fit in bearing outer ring 1 front and rear both sides, groove assembly sets up inside bearing outer ring 1.

[0027] Among them, groove assembly includes: ceramic insulation coating 101 and rivet 301, ceramic insulation coating 101 is covered in bearing outer ring 1 outside, rivet 301 is provided with multiple groups, and multiple groups of rivet 301 circumferential array is in retainer 3 inside.

[0028] Among them, groove assembly still includes: through hole 302 and arc slot 303, through hole 302 is provided with multiple groups, and multiple groups of through hole 302 are set up in retainer 3 inside, and arc slot 303 is set up with multiple groups, and multiple groups of arc slot 303 are set up in retainer 3 inside, and arc slot 303 and through hole 302 are interconnected.

[0029] Among them, groove assembly still includes: circular arc chamfer 304, and circular arc chamfer 304 is set up in multiple groups of arc slot 303 outside.

[0030] The specific use mode and effect of the embodiment:

[0031] By covering ceramic insulation coating 101 in bearing outer ring 1 outside, efficient insulation barrier can be built, the shaft current generated when the frequency conversion motor is running is effectively blocked, damage to deep groove raceway 5 and rolling element 4 caused by electric erosion is avoided, and the service life of the bearing is significantly prolonged. Combined with the rolling element 4 made of silicon nitride ceramic material, a double insulation protection system is formed, and the anti-electric erosion performance is further improved. At the same time, only the bearing outer ring 1 is coated, the material cost and process complexity are greatly reduced under the premise of ensuring the anti-electric erosion effect, and the production process is simplified. In addition, the design does not affect the assembly adaptability of the outer ring and the frequency conversion motor bearing seat, and is convenient for installation and maintenance.

[0032] During the operation of the bearing, when the rolling body 4 rolls in the retainer 3, it can drive the lubricating grease into the arc-shaped groove 303. The arc-shaped groove 303 can effectively intercept and store the lubricating grease, continuously provide lubrication for the rolling body 4, and avoid the problem of uneven lubrication caused by centrifugal force. The circular arc chamfer 304 outside the arc-shaped groove 303 can effectively reduce the wear of the rolling body 4 by optimizing the contact surface profile, and improve the stability of the bearing operation.

[0033] The through hole 302 provided on the retainer 3 not only improves the structural permeability of the retainer 3, enhances the heat dissipation effect, effectively avoids the accumulation of heat generated by the rolling body 4 due to high-speed operation, but also forms a grease flow channel in communication with the arc-shaped groove 303, promotes the circulation and flow of the lubricating grease and heat conduction, and further optimizes the lubrication and heat dissipation performance of the bearing.

[0034] Example two: based on example one, as shown in the figure, it also includes a maintenance assembly arranged inside the sealing sleeve 6. Figures 1 to 5

[0035] The maintenance assembly includes a reaction tank 601 fixedly installed inside the sealing sleeve 6, and the reaction tank 601 is filled with color-changing silica gel.

[0036] The maintenance assembly further includes a transparent window 602 and a microfiltration membrane 603, the transparent window 602 is fixedly installed on the front side of the reaction tank 601, and the microfiltration membrane 603 is fixedly installed on the rear side of the reaction tank 601.

[0037] The specific use and effect of the embodiment are as follows:

[0038] The reaction tank 601 in the maintenance assembly forms a selective communication structure with the inside of the bearing through the microfiltration membrane 603 on the rear side. Based on the oil-repellent and water-attracting characteristics and the pore size design, the microfiltration membrane 603 can effectively intercept the lubricating grease while allowing water vapor to penetrate into the inside of the reaction tank 601. The color-changing silica gel filled in the reaction tank 601 realizes humidity visualization monitoring through the reversible hydration reaction of cobalt chloride: when there is no water, cobalt chloride appears blue; as the water vapor adsorption increases, it gradually changes to blue-violet, purple-red and finally pink.

[0039] When the sealing sleeve 6 fails due to aging, damage, etc., external water vapor penetrates into the inside of the bearing, reacts with the color-changing silica gel in the reaction tank 601 through the microfiltration membrane 603. The operator can directly observe the color change of the silica gel through the transparent window 602 on the front side of the reaction tank 601, quickly judge the humidity condition in the bearing, and realize early warning of sealing failure.

[0040] In this embodiment, the oil-repellent and water-attracting characteristics of the microfiltration membrane 603 are mature existing technologies, which will not be described in detail here.

[0041] ​In this article, the following points need to be noted:

[0042] 1. The drawings of the embodiments only relate to the structures involved in the embodiments, and other structures can refer to the general design.

[0043] 2. In the case of no conflict, the features in the embodiments and the embodiments can be combined with each other to obtain new embodiments.

[0044] The above is only a specific embodiment of the present embodiment, but the protection scope of the present embodiment is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present embodiment, which should be covered within the protection scope of the present embodiment. Therefore, the protection scope of the present embodiment should be subject to the protection scope of the claims.

Claims

1. Deep groove ball bearing for variable frequency electric motors, characterized in that: The special deep groove ball bearing for variable frequency motor comprises a bearing outer ring (1), a bearing inner ring (2), a retainer (3), a rolling element (4), a deep groove raceway (5), a sealing sleeve (6), a groove assembly, a ceramic insulation coating (101), a rivet (301) and a maintenance assembly, the bearing inner ring (2) is arranged inside the bearing outer ring (1); the retainer (3) is arranged between the bearing outer ring (1) and the bearing inner ring (2); the rolling element (4) is arranged inside the retainer (3); the deep groove raceway (5) is arranged on the inner side of the bearing outer ring (1), and the deep groove raceway (5) is arranged on the outer side of the bearing inner ring (2); the sealing sleeve (6) is interference-fitted on the front and rear sides of the bearing outer ring (1); the groove assembly is arranged inside the bearing outer ring (1); the groove assembly comprises the ceramic insulation coating (101) and the rivet (301), the ceramic insulation coating (101) is coated on the outer side of the bearing outer ring (1); the rivet (301) is arranged in multiple groups, and the multiple groups of rivets (301) are circumferentially arranged inside the retainer (3); the maintenance assembly is arranged inside the sealing sleeve (6); the maintenance assembly comprises a reaction tank (601), the reaction tank (601) is fixedly installed inside the sealing sleeve (6), and the reaction tank (601) is filled with color-changing silica gel.

2. The deep groove ball bearing for variable frequency motor as claimed in claim 1, wherein: The groove assembly further comprises through holes (302) and arc-shaped grooves (303), the through holes (302) are arranged in multiple groups, and the multiple groups of through holes (302) are arranged inside the retainer (3); the arc-shaped grooves (303) are arranged in multiple groups, and the multiple groups of arc-shaped grooves (303) are arranged on the inner side of the retainer (3), and the arc-shaped grooves (303) and the through holes (302) are in communication with each other.

3. The deep groove ball bearing for variable frequency motors as described in claim 2, characterized in that: The groove assembly further comprises a circular arc chamfer (304), and the circular arc chamfer (304) is arranged on the outer side of the multiple groups of arc-shaped grooves (303).

4. The deep groove ball bearing for variable frequency motor as claimed in claim 1 wherein: The maintenance assembly further comprises a transparent window (602) and a microfiltration membrane (603), the transparent window (602) is fixedly installed on the front side of the reaction tank (601), and the microfiltration membrane (603) is fixedly installed on the rear side of the reaction tank (601).

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