Device for eliminating shaft current of variable frequency motor

Abstract

The utility model relates to a device for eliminating shaft current of a variable frequency motor, which belongs to the technical field of variable frequency motors and comprises a variable frequency motor shaft body, an eliminating mechanism is arranged outside the variable frequency motor shaft body, a speed measuring component is arranged on the right side of the variable frequency motor shaft body, and the eliminating mechanism comprises a mounting plate sleeved with the variable frequency motor shaft body. According to the device for eliminating the shaft current of the variable frequency motor, by arranging the eliminating mechanism, a user can conveniently adjust the current eliminating device, the current eliminating device can conveniently adapt to connection with variable frequency motor shafts of different sizes, the user can conveniently install and use the current eliminating device, and the problems that no adjusting structure is provided, and operation is inconvenient are solved. The problems that in the using process of the variable frequency motor shaft current eliminating device, a user cannot conveniently adjust the current eliminating device, the current eliminating device cannot conveniently adapt to connection of variable frequency motor shafts of different sizes, and the practicability of the variable frequency motor shaft current eliminating device is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of variable-frequency motors, in particular to a device for eliminating the shaft current of a variable-frequency motor. Background Technique

[0002] With the rapid development of power electronics technology and new semiconductor devices, the AC speed regulation technology has been continuously improved and enhanced. The gradually improved frequency converter has been widely used in AC motors with its good output waveform and excellent performance-price ratio. The variable-frequency motor is used more and more. Usually, the variable-frequency motor adopts a six-wire special shielded cable, and the motor shell is connected to the ground and introduced to the common grounding busbar in the power distribution room for connection.

[0003] Please refer to a device for eliminating the shaft current of a variable-frequency motor with the publication number of CN221177483U. It adopts a combination of an elastic member and a carbon brush structure. The carbon brush rubs against the motor shaft to introduce the shaft current of the motor stator into the ground through wire I and wire II, so as to extend the service life of the motor bearing. It adopts a combination of a support rod and a base, and can adjust the height independently to avoid the carbon brush detaching from the motor shaft and reduce the hidden danger of failure. A limit nut is provided on the support rod to limit the static position of the support rod.

[0004] However, in this patent, there is no adjustment structure. During the use of the device for eliminating the shaft current of a variable-frequency motor, it is not convenient for the user to adjust the current elimination device, and it is not convenient for the current elimination device to adapt to the connection of variable-frequency motor shafts of different sizes, which affects the practicability of the device for eliminating the shaft current of a variable-frequency motor. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a device for eliminating the shaft current of a variable-frequency motor, which has the advantages of convenient adjustment and easy use, and solves the problems that there is no adjustment structure, it is not convenient for the user to adjust the current elimination device during the use of the device for eliminating the shaft current of a variable-frequency motor, it is not convenient for the current elimination device to adapt to the connection of variable-frequency motor shafts of different sizes, and it affects the practicability of the device for eliminating the shaft current of a variable-frequency motor.

[0006] To achieve the above object, the utility model provides the following technical solution: A device for eliminating the shaft current of a variable-frequency motor, including a variable-frequency motor shaft body, an elimination mechanism is arranged outside the variable-frequency motor shaft body, and a speed measurement component is arranged on the right side of the variable-frequency motor shaft body;

[0007] The elimination mechanism includes a mounting disk sleeved on the main body of the variable-frequency motor shaft. Two feet are fixedly connected to the bottom of the mounting disk. A cylinder sleeved on the main body of the variable-frequency motor shaft is fixedly connected to the top of the mounting disk. Two adjusting threaded rods are threadedly connected inside the cylinder. Arc-shaped conductive blocks are fixedly connected to the outer parts of the opposite ends of the two adjusting threaded rods. Adjusting rods hinged to the mounting disk are hinged to the opposite sides of the two arc-shaped conductive blocks. A grounding wire is fixedly connected to the right side of the mounting disk. A connection ring is fixedly connected to the end of the grounding wire away from the mounting disk.

[0008] Furthermore, the two feet are symmetrically distributed, and a fixing screw is threadedly connected inside the foot.

[0009] Furthermore, two threaded holes are provided inside the cylinder, and the adjusting threaded rod is threadedly connected to the cylinder through the threaded hole.

[0010] Furthermore, bearings are fixedly connected to the outer parts of the opposite ends of the two adjusting threaded rods, and the adjusting threaded rod is fixedly connected to the arc-shaped conductive block through the bearing.

[0011] Furthermore, a hinge seat is arranged inside the mounting disk, and the adjusting rod is hinged to the mounting disk through the hinge seat.

[0012] Furthermore, the speed measurement component includes a top plate fixedly connected to the cylinder. A rotating cylinder sleeved on the main body of the variable-frequency motor shaft is fixedly connected inside the top plate. A buckle component clamped to the main body of the variable-frequency motor shaft is arranged inside the rotating cylinder. A gear is fixedly connected to the outside of the rotating cylinder. A speed measurement sensor corresponding to the position of the gear is fixedly connected to the top of the top plate.

[0013] Furthermore, a connecting bearing is fixedly connected to the outside of the rotating cylinder, and the rotating cylinder is fixedly connected to the top plate through the connecting bearing.

[0014] Furthermore, the buckle component includes a pull rod, a spring and a clamping block, and the pull rod penetrates through the rotating cylinder.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0016] 1. For the device for eliminating the shaft current of the variable-frequency motor, by setting the elimination mechanism, it is convenient for the user to adjust the current elimination device, facilitating the current elimination device to adapt to the connection with variable-frequency motor shafts of different sizes, which is beneficial for the user to install and use the current elimination device, and solves the problem that there is no adjustment structure, making it inconvenient for the user to adjust the current elimination device during the use of the device for eliminating the shaft current of the variable-frequency motor, and not facilitating the current elimination device to adapt to the connection with variable-frequency motor shafts of different sizes, thus affecting the practicability of the device for eliminating the shaft current of the variable-frequency motor.

[0017] 2. The device for eliminating the shaft current of the variable-frequency motor is provided with a speed measurement component, which facilitates the speed measurement of the variable-frequency motor and real-time monitors the rotation speed of the shaft of the variable-frequency motor. Description of the Drawings

[0018] Figure 1 It is a structural sectional view of the present utility model;

[0019] Figure 2 For the present utility model Figure 1 Enlarged view of structure A in;

[0020] Figure 3 It is a front view of the structure of the present utility model;

[0021] Figure 4 It is a three-dimensional view of a part of the structure of the present utility model.

[0022] In the figure: 1. Variable-frequency motor shaft body; 2. Mounting plate; 3. Foot; 4. Cylinder; 5. Adjusting screw rod; 6. Arc-shaped conductive block; 7. Adjusting rod; 8. Grounding wire; 9. Connecting ring; 10. Top plate; 11. Rotary drum; 12. Buckle assembly; 13. Gear; 14. Speed sensor; 15. Connecting bearing. Specific Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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.

[0024] Please refer to Figures 1 to 4 , the device for eliminating the shaft current of the variable-frequency motor in this embodiment includes a variable-frequency motor shaft body 1, an elimination mechanism is arranged outside the variable-frequency motor shaft body 1, and a speed measurement component is arranged on the right side of the variable-frequency motor shaft body 1.

[0025] Example 1. The elimination mechanism includes a mounting disk 2 sleeved on the main body 1 of the variable-frequency motor shaft. At the bottom of the mounting disk 2, there are two feet 3 fixedly connected. The two feet 3 are symmetrically distributed. A fixing screw is threadedly connected inside the feet 3. The user fixes the feet 3 to the outer shell of the variable-frequency motor through the fixing screw, completing the installation and fixation of the mounting disk 2. At the top of the mounting disk 2, there is a cylinder 4 sleeved on the main body 1 of the variable-frequency motor shaft. Inside the cylinder 4, there are two adjusting threaded rods 5 threadedly connected. There are two threaded holes opened inside the cylinder 4. The adjusting threaded rods 5 are threadedly connected to the cylinder 4 through the threaded holes, facilitating the connection between the adjusting threaded rods 5 and the cylinder 4 and enabling the user to turn the two adjusting threaded rods 5 for adjustment. The two adjusting threaded rods 5 are symmetrically distributed.

[0026] Among them, on the outer sides of the opposite ends of the two adjusting threaded rods 5, there are arc-shaped conductive blocks 6 fixedly connected. On the outer sides of the opposite ends of the two adjusting threaded rods 5, there are bearings fixedly connected. The adjusting threaded rods 5 are fixedly connected to the arc-shaped conductive blocks 6 through the bearings, facilitating the connection between the adjusting threaded rods 5 and the arc-shaped conductive blocks 6 and enabling the adjusting threaded rods 5 to be turned. The user turns the two adjusting threaded rods 5, driving the two arc-shaped conductive blocks 6 to move relatively or away from each other. By adjusting the positions of the two arc-shaped conductive blocks 6, the arc-shaped conductive blocks 6 are made to fit variable-frequency motor shafts 1 of different sizes. When the variable-frequency motor is working, the current on the variable-frequency motor shaft 1 is transmitted to the arc-shaped conductive blocks 6.

[0027] In addition, on the sides where the two arc-shaped conductive blocks 6 are away from each other, there are adjusting rods 7 hinged to the mounting disk 2. On the right side of the mounting disk 2, there is a grounding wire 8 fixedly connected. The end of the grounding wire 8 away from the mounting disk 2 is fixedly connected with a connection ring 9. Inside the mounting disk 2, there is a hinge seat. The adjusting rods 7 are hinged to the mounting disk 2 through the hinge seat, limiting the arc-shaped conductive blocks 6 so that the arc-shaped conductive blocks 6 do not rotate following the adjusting threaded rods 5. The current on the arc-shaped conductive blocks 6 is transmitted to the mounting disk 2 through the adjusting rods 7. The current transmitted to the mounting disk 2 is transmitted to the ground through the grounding wire 8 and the connection ring 9, thereby transmitting and eliminating the current on the variable-frequency motor shaft 1.

[0028] It should be noted that by setting the elimination mechanism, it is convenient for the user to adjust the current elimination device, facilitating the current elimination device to adapt to the connection with variable-frequency motor shafts of different sizes, which is beneficial to the installation and use of the current elimination device by the user, and solves the problem that there is no adjustment structure, making it inconvenient for the user to adjust the current elimination device during the use of the variable-frequency motor shaft current elimination device, and not facilitating the current elimination device to adapt to the connection with variable-frequency motor shafts of different sizes, affecting the practicality of the variable-frequency motor shaft current elimination device.

[0029] Specifically, during the use of the device for eliminating the shaft current of the variable-frequency motor, the mounting plate 2 and the cylinder body 4 are sleeved on the variable-frequency motor shaft body 1, and the base 3 is fixedly connected to the variable-frequency motor housing through the fixing screws on the base 3, completing the fixation of the mounting plate 2 and the cylinder body 4. Then, turn the two adjusting threaded rods 5 to drive the arc-shaped conductive block 6 to move relatively, so that the arc-shaped conductive block 6 fits on the variable-frequency motor shaft body 1, and the connecting ring 9 is fixedly connected to the grounding wire, thereby achieving the purpose of adapting to connect with variable-frequency motor shaft bodies 1 of different sizes;

[0030] When the variable-frequency motor is working, the current on the variable-frequency motor shaft body 1 is transmitted to the arc-shaped conductive block 6, and the current on the arc-shaped conductive block 6 is transmitted to the mounting plate 2 through the adjusting rod 7. The current transmitted to the mounting plate 2 is transmitted to the ground through the grounding wire 8 and the connecting ring 9, thereby achieving the purpose of transmitting and eliminating the current on the variable-frequency motor shaft body 1.

[0031] Embodiment 2: Please refer to Figures 1 to 4 , the speed measurement component includes a top plate 10 fixedly connected to the cylinder body 4. Inside the top plate 10, there is a rotating cylinder 11 sleeved on the variable-frequency motor shaft body 1. An annular bearing 15 is fixedly connected to the outside of the rotating cylinder 11. The rotating cylinder 11 is fixedly connected to the top plate 10 through the annular bearing 15, facilitating the fixed connection between the rotating cylinder 11 and the top plate 10 and the rotation of the rotating cylinder 11. Inside the rotating cylinder 11, there is a snap component 12 clamped to the variable-frequency motor shaft body 1. A gear 13 is fixedly connected to the outside of the rotating cylinder 11, and a speed measurement sensor 14 corresponding to the position of the gear 13 is fixedly connected to the top of the top plate 10. The snap component 12 includes a pull rod, a spring, and a clamping block. The pull rod penetrates the rotating cylinder 11, the spring is sleeved on the outside of the pull rod, and the clamping block is fixedly connected to one end of the pull rod. The clamping block is clamped to the variable-frequency motor shaft body 1. When the variable-frequency motor shaft body 1 rotates, it drives the snap component 12 and the rotating cylinder 11 to rotate. The rotating cylinder 11 drives the gear 13 to rotate, and the speed measurement sensor 14 monitors the rotation speed of the gear 13 in real time, thereby obtaining the rotation speed of the variable-frequency motor.

[0032] It should be noted that by setting the speed measurement component, it is convenient to measure the speed of the variable-frequency motor and monitor the rotation speed of the variable-frequency motor shaft in real time.

[0033] Specifically, when the variable-frequency motor is working, the variable-frequency motor shaft body 1 rotates, driving the snap component 12 and the rotating cylinder 11 to rotate. The rotating cylinder 11 drives the gear 13 to rotate, and the speed measurement sensor 14 monitors the rotation speed of the gear 13 in real time, thereby obtaining the rotation speed of the variable-frequency motor.

[0034] The working principle of the above embodiment is:

[0035] (1) For the device for eliminating the shaft current of a variable-frequency motor, during the use of the device for eliminating the shaft current of a variable-frequency motor, the mounting plate 2 and the cylinder body 4 are sleeved on the variable-frequency motor shaft body 1, and the base feet 3 are fixedly connected to the variable-frequency motor housing through the fixing screws on the base feet 3 to complete the fixation of the mounting plate 2 and the cylinder body 4. Then, turn the two adjusting threaded rods 5 to drive the arc-shaped conductive blocks 6 to move relatively, so that the arc-shaped conductive blocks 6 are in contact with the variable-frequency motor shaft body 1, and the connecting ring 9 is fixedly connected to the grounding wire, thereby achieving the purpose of adapting to connection with variable-frequency motor shaft bodies 1 of different sizes;

[0036] When the variable-frequency motor is working, the current on the variable-frequency motor shaft body 1 is transmitted to the arc-shaped conductive block 6, and the current on the arc-shaped conductive block 6 is transmitted to the mounting plate 2 through the adjusting rod 7. The current transmitted to the mounting plate 2 is transmitted to the ground through the grounding wire 8 and the connecting ring 9, thereby achieving the purpose of transmitting and eliminating the current on the variable-frequency motor shaft body 1.

[0037] (2) For the device for eliminating the shaft current of a variable-frequency motor, when the variable-frequency motor is working, the variable-frequency motor shaft body 1 rotates, driving the buckle assembly 12 and the rotating cylinder 11 to rotate. The rotating cylinder 11 drives the gear 13 to rotate, and the speed measurement sensor 14 monitors the rotation speed of the gear 13 in real time, thereby obtaining the rotation speed of the variable-frequency motor.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for eliminating shaft current of a variable frequency motor, comprising a shaft body of the variable frequency motor (1), characterized in that: An elimination mechanism is arranged outside the variable frequency motor shaft body (1), and a speed measuring component is arranged on the right side of the variable frequency motor shaft body (1); The elimination mechanism comprises a mounting plate (2) sleeved with a variable frequency motor shaft body (1), two feet (3) being fixedly connected to the bottom of the mounting plate (2), a cylinder (4) sleeved with the variable frequency motor shaft body (1) being fixedly connected to the top of the mounting plate (2), two adjusting threaded rods (5) being internally threadedly connected to the cylinder (4), arc-shaped conductive blocks (6) being fixedly connected to the outside of opposite ends of the two adjusting threaded rods (5), adjusting rods (7) being hingedly connected to the mounting plate (2) on the separated sides of the two arc-shaped conductive blocks (6), a grounding wire (8) being fixedly connected to the right side of the mounting plate (2), and a connecting ring (9) being fixedly connected to the end of the grounding wire (8) away from the mounting plate (2).

2. The device for eliminating shaft current of a variable frequency motor according to claim 1, characterized in that: The two base feet (3) are symmetrically distributed, and the internal threads of the base feet (3) are connected with a fixing screw.

3. The device for eliminating shaft current of a variable frequency motor according to claim 1, characterized in that: Two threaded holes are provided inside the cylinder (4), and the adjusting threaded rod (5) is threadedly connected to the cylinder (4) via the threaded holes.

4. The device for eliminating shaft current of a variable frequency motor according to claim 1, characterized in that: The outsides of the two adjusting threaded rods (5) at opposite ends are fixedly connected with bearings, and the adjusting threaded rods (5) are fixedly connected to the arc-shaped conductive block (6) via the bearings.

5. The device for eliminating shaft current of a variable frequency motor according to claim 1, characterized in that: An articulated seat is provided inside the installation plate (2), and the adjustment rod (7) is articulated with the installation plate (2) via the articulated seat.

6. The device for eliminating shaft current of a variable frequency motor according to claim 1, characterized in that: The speed measuring assembly comprises a top plate (10) fixedly connected to a cylinder (4); a rotating drum (11) sleeved with a frequency conversion motor shaft body (1) is fixedly connected to the interior of the top plate (10); a buckle assembly (12) is provided inside the rotating drum (11) and is snap-fitted with the frequency conversion motor shaft body (1); a gear (13) is fixedly connected to the exterior of the rotating drum (11); and a speed measuring sensor (14) corresponding to the position of the gear (13) is fixedly connected to the top of the top plate (10).

7. The device for eliminating shaft current of a variable frequency motor according to claim 6, characterized in that: A connecting bearing (15) is fixedly connected to the outside of the rotating drum (11), and the rotating drum (11) is fixedly connected to the top plate (10) via the connecting bearing (15).

8. The device for eliminating shaft current of a variable frequency motor according to claim 6, characterized in that: The buckle assembly (12) comprises a pull rod, a spring and a clamping block, and the pull rod passes through the rotating drum (11).

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