Device for overcoming corrosion of variable frequency motor shaft current to motor bearing

Abstract

The utility model relates to a device for overcoming corrosion of variable frequency motor shaft current to a motor bearing, which belongs to the technical field of variable frequency motors, and comprises a shell, a bearing, an end cover and a motor shaft, the bearing, the end cover and the motor shaft are arranged on the shell, the left side surface of the end cover is fixedly connected with two connecting blocks, the peripheral wall of the motor shaft is sleeved with a lantern ring, and the lantern ring is fixedly connected with the shell. And connecting grooves are formed in the left side faces of the two connecting blocks correspondingly, moving plates are placed in the two connecting grooves correspondingly, clamping rings are fixedly connected to the opposite side faces of the two moving plates correspondingly, and electric brushes are placed in the two clamping rings correspondingly. According to the device for overcoming the corrosion of the variable frequency motor shaft current to the motor bearing, the current is grounded and the service life of the bearing is prolonged under the action of the electric brush, the lantern ring and the wire, the electric brush is pushed to move under the action of the first spring and is always in contact with the lantern ring, a gap between the electric brush and the lantern ring is avoided as much as possible, and the service life of the bearing is prolonged. The use effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of variable-frequency motors, and particularly relates to a device for overcoming the corrosion of the shaft current of a variable-frequency motor to the motor bearing. Background Technique

[0002] A variable-frequency motor refers to a motor that can continuously operate within the range of 10% to 100% of the rated speed with 100% rated load under standard environmental conditions, and the temperature rise will not exceed the rated allowable value of the motor. Since the motor is a high-power variable-frequency motor, three types of high-frequency bearing currents: circulating current, shaft grounding current, and capacitive discharge current may all exist.

[0003] Chinese Patent CN202488122U discloses a motor shaft current grounding device, which discloses a technical solution for extending the service life of the bearing, and solves the problem that when the existing shaft current is relatively large, the current flows through the bearing, which will cause great damage to the bearing and reduce the service life of the bearing.

[0004] When the device is in use, it is grounded through a carbon brush to ground the current flowing through the bearing, thereby improving the service life of the bearing. However, the carbon brush and the slip ring are in sliding contact, which is likely to cause wear to the carbon brush, and then cause a gap between the carbon brush and the slip ring, reducing the use effect. Therefore, a device for overcoming the corrosion of the shaft current of a variable-frequency motor to the motor bearing is proposed to solve the above problems. Content of the Utility Model

[0005] In view of the deficiencies of the prior art, the utility model provides a device for overcoming the corrosion of the shaft current of a variable-frequency motor to the motor bearing, which has the advantage of improving the use effect, and solves the problem that when the device is in use, it is grounded through a carbon brush to ground the current flowing through the bearing, thereby improving the service life of the bearing. However, the carbon brush and the slip ring are in sliding contact, which is likely to cause wear to the carbon brush, and then cause a gap between the carbon brush and the slip ring, reducing the use effect.

[0006] To achieve the above object, the utility model provides the following technical solution: A device for overcoming the corrosion of the shaft current of a variable-frequency motor to the motor bearing, comprising a housing and a bearing, an end cover and a motor shaft arranged on the housing. The left side surface of the end cover is fixedly connected with two connecting blocks, and a collar is sleeved on the outer peripheral wall of the motor shaft.

[0007] Connecting grooves are respectively opened on the left side surfaces of the two connecting blocks, moving plates are respectively placed inside the two connecting grooves, clamping rings are fixedly connected to the opposite side surfaces of the two moving plates, carbon brushes are respectively placed inside the two clamping rings, relief grooves are respectively opened on the front surfaces of the two connecting blocks, and two mounting grooves are opened on the left side surface of the collar.

[0008] A support assembly is provided inside each of the two connecting grooves to support the moving plate.

[0009] A fixing assembly is provided on the collar to fix the collar.

[0010] Furthermore, the moving plate fits with the connecting groove, the snap ring is a rectangular ring, and the brush fits with the snap ring.

[0011] Furthermore, the two relief grooves communicate with the two connecting grooves respectively, and the relief grooves are located at the bottom of the moving plate.

[0012] Furthermore, the support assembly includes a first telescopic rod, the first telescopic rod is fixedly connected inside the connecting groove, the first telescopic rod is fixedly connected with the moving plate, a first spring fixedly connected with the connecting groove and the moving plate respectively is sleeved on the outer peripheral wall of the first telescopic rod, and a wire fixedly connected inside the connecting groove and extending to the back of the connecting block through the connecting groove is provided.

[0013] Furthermore, the wire fits with the brush, and the two moving plates are located between the two first telescopic rods.

[0014] Furthermore, the fixing assembly includes two second telescopic rods, the two second telescopic rods are respectively fixedly connected inside the two mounting grooves, baffles are fixedly connected to the opposite sides of the two second telescopic rods, positioning rods are fixedly connected to the opposite sides of the two baffles, positioning holes are formed in the top and bottom surfaces of the motor shaft, the two positioning rods respectively extend into the two positioning holes, and second springs fixedly connected with the mounting grooves and the baffles respectively are sleeved on the outer peripheral walls of the two second telescopic rods.

[0015] Furthermore, the positioning rod and the positioning hole are in clearance fit, and the baffle fits with the motor shaft.

[0016] Furthermore, both the first telescopic rod and the second telescopic rod are composed of a sleeve bin and a moving rod, one end of the moving rod penetrates and extends into the sleeve bin, a limiting block located inside the sleeve bin is fixedly connected to the outside of the moving rod, and a through hole adapted to the moving rod is formed in one side of the sleeve bin.

[0017] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0018] 1. The device for overcoming the corrosion of the motor bearing by the shaft current of the variable-frequency motor grounds the current through the action of the brush, the collar and the wire, improves the service life of the bearing, and through the action of the first spring, pushes the brush to move, so that the brush is always in contact with the collar, and tries to avoid generating gaps between the brush and the collar, thereby improving the use effect;

[0019] 2. The device for overcoming the corrosion of the motor bearing caused by the shaft current of the variable-frequency motor fixes the collar on the motor shaft through the clearance fit between the positioning rod and the positioning hole, facilitating the disassembly and assembly of the collar. Under the action of the second telescopic rod and the second spring, the positioning rod is supported, improving the stability of the positioning rod, and being more convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the present utility model;

[0021] Figure 2 is a left-side view of the collar in the structure of the present utility model;

[0022] Figure 3 is Figure 2 an enlarged schematic view of the structure of A in;

[0023] Figure 4 is a left-side view of the connecting groove in the structure of the present utility model;

[0024] Figure 5 is a top view of the top connecting block in the structure of the present utility model.

[0025] In the figure: 1 housing, 2 bearing, 3 end cover, 4 connecting block, 5 collar, 6 motor shaft, 7 installation groove, 8 second telescopic rod, 9 second spring, 10 baffle, 11 positioning rod, 12 positioning hole, 13 first telescopic rod, 14 first spring, 15 moving plate, 16 snap ring, 17 wire, 18 brush, 19 relief groove, 20 connecting groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment 1: Please refer to Figures 1 to 5 , a device for overcoming the corrosion of the motor bearing caused by the shaft current of the variable-frequency motor in this embodiment includes a housing 1 and a bearing 2, an end cover 3 and a motor shaft 6 arranged on the housing 1. Two connecting blocks 4 are fixedly connected to the left side surface of the end cover 3, and a collar 5 is sleeved on the outer peripheral wall of the motor shaft 6.

[0028] The left side surfaces of both connecting blocks 4 are provided with connecting grooves 20. Inside both connecting grooves 20, moving plates 15 are placed. On the opposite side surfaces of both moving plates 15, snap rings 16 are fixedly connected. Inside both snap rings 16, brush holders 18 are placed. On the front surfaces of both connecting blocks 4, relief grooves 19 are provided. On the left side surface of the collar 5, two mounting grooves 7 are provided.

[0029] Among them, the moving plate 15 fits with the connecting groove 20. The snap ring 16 is a rectangular ring. The brush holder 18 fits with the snap ring 16. The two relief grooves 19 communicate with the two connecting grooves 20 respectively. The relief groove 19 is located at the bottom of the moving plate 15.

[0030] Specifically, by pushing the brush holder 18, the brush holder 18 passes through the relief groove 19 and enters the inside of the connecting groove 20. Then the brush holder 18 is located at the bottom of the snap ring 16. The brush holder 18 is located inside the snap ring 16, restricting the brush holder 18. Then the brush holder 18 fits with the collar 5.

[0031] Embodiment Two: Please refer to Figures 1 to 5 , in this embodiment, on the basis of Embodiment One, both inside the two connecting grooves 20 are provided with support components. The support component includes a first telescopic rod 13. The first telescopic rod 13 is fixedly connected inside the connecting groove 20. The first telescopic rod 13 is fixedly connected with the moving plate 15. A first spring 14 that is fixedly connected with the connecting groove 20 and the moving plate 15 respectively is sleeved on the outer peripheral wall of the first telescopic rod 13. Inside the connecting groove 20, a wire 17 is fixedly connected, and one end of the wire 17 penetrates through the connecting groove 20 and extends to the back surface of the connecting block 4.

[0032] Among them, the wire 17 fits with the brush holder 18. The two moving plates 15 are located between the two first telescopic rods 13.

[0033] Specifically, by pulling the moving plate 15, the moving plate 15 drives the snap ring 16 to move, squeezing the first telescopic rod 13 and the first spring 14, causing the first telescopic rod 13 and the first spring 14 to contract. The brush holder 18 is located at the bottom of the snap ring 16. By releasing the moving plate 15, under the action of the first spring 14, the snap ring 16 is pushed back to its original position. Through the cooperation among the collar 5, the wire 17, and the brush holder 18, the current is grounded, improving the service life of the bearing 2.

[0034] Embodiment Three: Please refer to Figures 1 to 5, in this embodiment, on the basis of the first embodiment and the second embodiment, it includes that a fixing component is provided on the collar 5. The fixing component includes two second telescopic rods 8. The two second telescopic rods 8 are respectively fixedly connected inside the two mounting grooves 7. On the opposite side surfaces of the two second telescopic rods 8, baffles 10 are fixedly connected. On the opposite side surfaces of the two baffles 10, positioning rods 11 are fixedly connected. Positioning holes 12 are formed on the top surface and the bottom surface of the motor shaft 6. The two positioning rods 11 respectively extend into the two positioning holes 12. Second springs 9 which are respectively fixedly connected to the mounting grooves 7 and the baffles 10 are sleeved on the outer peripheral walls of the two second telescopic rods 8.

[0035] Among them, the positioning rod 11 and the positioning hole 12 are in clearance fit. The baffle 10 and the motor shaft 6 are in contact. Both the first telescopic rod 13 and the second telescopic rod 8 are composed of a sleeve bin and a moving rod. One end of the moving rod penetrates and extends into the inside of the sleeve bin. A limiting block located inside the sleeve bin is fixedly connected to the outer side of the moving rod. A through hole adapted to the moving rod is formed on one side of the sleeve bin.

[0036] Specifically, pull the baffle 10 to drive the positioning rod 11 to move, squeeze the second telescopic rod 8 and the second spring 9, so that the second telescopic rod 8 and the second spring 9 contract. Push the collar 5 to sleeved the collar 5 on the motor shaft 6. The positioning rod 11 and the positioning hole 12 are on the same center line. Release the baffle 10. Under the action of the second spring 9, push the positioning rod 11 to reset. The positioning rod 11 is inserted into the positioning hole 12. Through the clearance fit between the positioning rod 11 and the positioning hole 12, the collar 5 is fixed on the motor shaft 6.

[0037] The working principle of the above embodiment is:

[0038] Pull the baffle 10 to make the baffle 10 drive the positioning rod 11 to move, squeeze the second telescopic rod 8 and the second spring 9 to shrink the second telescopic rod 8 and the second spring 9, push the collar 5, and put the collar 5 on the motor shaft 6. The positioning rod 11 and the positioning hole 12 are located on the same center line. Loosen the baffle 10, and push the positioning rod 11 to reset under the action of the second spring 9. The positioning rod 11 is inserted into the inside of the positioning hole 12. The collar 5 is fixed on the motor shaft 6 through the clearance between the positioning rod 11 and the positioning hole 12, and the moving plate 15 is pulled so that the moving plate 15 drives the snap ring 16 to move. Move, squeeze the first telescopic rod 13 and the first spring 14, make the first telescopic rod 13 and the first spring 14 shrink, push the brush 18, the brush 18 passes through the give way groove 19 into the inside of the connecting groove 20, and then the brush 18 is located at the bottom of the snap ring 16, loosen the movable plate 15, and push the snap ring 16 to reset under the action of the first spring 14, so that the brush 18 is located inside the snap ring 16, restrict the brush 18, and then make the brush 18 and the ring 5 fit together, through the cooperation between the ring 5, the wire 17 and the brush 18, the current is grounded, and the service life of the bearing 2 is improved.

[0039] 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. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for overcoming the corrosion of a variable frequency motor shaft current on a motor bearing, comprising a housing (1), a bearing (2) arranged on the housing (1), an end cover (3) and a motor shaft (6), characterized in that: Two connecting blocks (4) are fixedly connected to the left side of the end cover (3), and a collar (5) is sleeved on the outer peripheral wall of the motor shaft (6); The left sides of the two connecting blocks (4) are each provided with a connecting groove (20), a movable plate (15) is placed inside the two connecting grooves (20), a clamping ring (16) is fixedly connected to the opposite side of the two movable plates (15), a brush (18) is placed inside the two clamping rings (16), a clearance groove (19) is provided on the front side of the two connecting blocks (4), and two mounting grooves (7) are provided on the left side of the sleeve ring (5); Support components are provided inside the two connection grooves (20), and a fixing component is provided on the collar (5).

2. The device for overcoming the corrosion of motor bearings caused by shaft current of a variable frequency motor according to claim 1, characterized in that: The movable plate (15) and the connecting groove (20) are in close contact with each other, the snap ring (16) is a rectangular ring, and the brush (18) and the snap ring (16) are in close contact with each other.

3. The device for overcoming the corrosion of motor bearings caused by shaft current of a variable frequency motor according to claim 2, characterized in that: The two clearance grooves (19) are respectively connected to the two connection grooves (20), and the clearance grooves (19) are located at the bottom of the movable plate (15).

4. The device for overcoming the corrosion of motor bearings caused by shaft current of a variable frequency motor according to claim 1, characterized in that: The support assembly comprises a first telescopic rod (13), the first telescopic rod (13) is fixedly connected inside a connecting groove (20), the first telescopic rod (13) and a movable plate (15) are fixedly connected, the outer peripheral wall of the first telescopic rod (13) is sleeved with a first spring (14) respectively fixedly connected to the connecting groove (20) and the movable plate (15), and the inside of the connecting groove (20) is fixedly connected with a wire (17) having one end penetrating the connecting groove (20) and extending to the back side of the connecting block (4).

5. The device for overcoming the corrosion of motor bearings caused by shaft current of a variable frequency motor according to claim 4, characterized in that: The conductor (17) and the brush (18) are in close contact with each other, and the two movable plates (15) are located between the two first telescopic rods (13).

6. The device for overcoming the corrosion of motor bearings caused by shaft current of a variable frequency motor according to claim 4, characterized in that: The fixing assembly comprises two second telescopic rods (8), the two second telescopic rods (8) are respectively fixedly connected to the inside of the two mounting grooves (7), the two second telescopic rods (8) are respectively fixedly connected to the opposite side surfaces with baffles (10), the two baffles (10) are respectively fixedly connected to the opposite side surfaces with positioning rods (11), the top surface and the bottom surface of the motor shaft (6) are respectively provided with positioning holes (12), the two positioning rods (11) respectively extend to the inside of the two positioning holes (12), and the outer peripheral walls of the two second telescopic rods (8) are respectively provided with second springs (9) fixedly connected to the mounting grooves (7) and the baffles (10).

7. The device for overcoming the corrosion of the motor bearing caused by the shaft current of the variable frequency motor according to claim 6, characterized in that: The positioning rod (11) and the positioning hole (12) are clearance-matched, and the baffle (10) and the motor shaft (6) are in close contact.

8. The device for overcoming the corrosion of the motor bearing caused by the shaft current of the variable frequency motor according to claim 7, characterized in that: The first telescopic rod (13) and the second telescopic rod (8) are both composed of a sleeve and a moving rod. One end of the moving rod penetrates and extends into the interior of the sleeve. The outer side of the moving rod is fixedly connected to a limiting block located inside the sleeve. A through hole matching the moving rod is opened on one side of the sleeve.

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