Speed regulation frequency conversion top drive noise reduction device and noise reduction method

Abstract

The invention discloses a speed regulation frequency conversion top drive noise reduction device and a noise reduction method.The speed regulation frequency conversion top drive noise reduction device comprises a low-noise motor, a fan air duct is arranged above the low-noise motor, a motor rotor is fixed to a top drive hollow shaft through an expansion sleeve, a motor stator is arranged on the outer side of the motor rotor, and the upper end of the motor stator is fixed to a top drive lifting box through a bolt; and the lower end of the motor stator is fixed through an end cover, a junction box is arranged at the lower end of the end cover, an air outlet shutter is arranged on the outer side of the end cover, and a fan volute is arranged at the top of the top drive hollow shaft. And the rotating speed of the fan under most industrial control during loading is reduced, so that the noise of the motor during working is reduced, the influence on the body of a constructor is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of top drive motor noise reduction, and in particular to a speed-regulating variable-frequency top drive noise reduction device and a noise reduction method. Background Art

[0002] In the prior art, the load of a direct-drive top drive during normal drilling is mainly between 50% and 60%, while the fan of a conventional top drive adopts non-variable frequency control, and the fan starts directly to reach the rated power and load, resulting in abundant wind pressure and air volume. Therefore, the noise level of a conventional air-cooled top drive device generally reaches about 108dB, which is significantly higher than the acceptable noise standards in many industrial environments and public buildings, and has indeed caused considerable trouble to the application and promotion of the equipment. This high noise not only affects the health and work efficiency of the operators, but may also have adverse effects on the surrounding environment, limiting the wide application of the equipment in more fields. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a variable frequency speed regulation top drive noise reduction device to solve the problem of excessive noise of the air-cooled top drive motor in the prior art.

[0004] A variable frequency speed regulation top drive noise reduction device comprises a low noise motor, a fan air guide tube is arranged above the low noise motor, and a motor rotor is fixed to a top drive hollow shaft by an expansion sleeve, a motor stator is arranged on the outside of the motor rotor, the upper end of the motor stator is fixed to a top drive lifting box by bolts, the lower end of the motor stator is fixed by an end cover, a junction box is arranged at the lower end of the end cover, an air outlet louver is arranged on the outside of the end cover, and a fan volute is arranged on the top of the top drive hollow shaft.

[0005] Furthermore, an inner positioning sleeve is provided on the inner side of the end cover, and the top drive hollow shaft passes through the inner positioning sleeve.

[0006] Furthermore, the outer side of the top drive hollow shaft is sleeved with an outer sealing ring.

[0007] Furthermore, a stabilizing bearing is arranged on the inner side of the end cover.

[0008] Furthermore, the side of the low-noise motor is also covered with air duct sound-absorbing cotton, and the thickness of the air duct sound-absorbing cotton is 15 mm.

[0009] Furthermore, the inner side of the fan air guide tube is covered with top sound-absorbing cotton, and the thickness of the top sound-absorbing cotton is 25 mm.

[0010] Furthermore, a noise reduction method for a speed-controlled variable-frequency top drive noise reduction device includes the following contents: a speed control strategy is used to control the fan, when the main motor load is in the range of 85%-100%, the fan speed is set to 100%; if the main motor load is between 65%-85%, the fan speed is adjusted to 80%; when the load drops to 50%-65%, the fan speed is matched to 60%; if the load further drops to 30%-50%, the fan speed is set to 45%; and when the main motor load is less than 30%, the fan speed is matched to 30%. Beneficial effects of the present invention: The present application sets up a motor heat dissipation duct, and sets sound-absorbing cotton inside the duct, and through frequency conversion, the fan speed is reduced under most industrial control conditions under load, thereby reducing the noise level when the motor is working, reducing the impact on the health of construction workers, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of a speed-controlled variable-frequency top drive noise reduction device; Figure 2 The present invention is a schematic diagram of the air duct structure of a speed-regulating and variable-frequency top-drive noise reduction device.

[0012] In the figure: 1- low noise motor, 2- fan air guide tube, 3- fan volute, 4- top drive lifting box, 5- expansion sleeve, 6- motor rotor, 7- motor stator, 8- junction box, 9- air outlet louver, 10- end cover, 11- centering bearing, 12- outer sealing ring, 13- top drive hollow shaft, 14- inner positioning sleeve, 15- air guide tube sound absorbing cotton, 16- top sound absorbing cotton. DETAILED DESCRIPTION

[0013] The following is an explanation of the embodiments of the present invention by specific specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to the embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. It should be noted that in this specification, similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures.

[0014] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "set", "connected", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances. The directions or positional relationships indicated by “upper”, “lower”, “left”, “right”, “inside”, “bottom”, etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0015] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0016] In this embodiment, as shown in the attached Figure 1-2 As shown, a variable frequency speed regulation top drive noise reduction device includes a low-noise motor 1, a fan air guide 2 is arranged above the low-noise motor 1, and also includes a motor rotor 6 fixed to a top drive hollow shaft 13 through an expansion sleeve 5, a motor stator 7 is arranged on the outside of the motor rotor 6, the upper end of the motor stator 7 is fixed to the top drive lifting box 4 by bolts, the lower end of the motor stator 7 is fixed by an end cover 10, a terminal box 8 is arranged at the lower end of the end cover 10, and an air outlet louver 9 is arranged on the outside of the end cover 10, and a fan volute 3 is arranged on the top of the top drive hollow shaft 13.

[0017] Furthermore, an inner positioning sleeve 14 is provided on the inner side of the end cover 10 , and the top drive hollow shaft 13 passes through the inner positioning sleeve 14 .

[0018] Furthermore, the outer side of the top drive hollow shaft 13 is covered with an outer sealing ring 12 .

[0019] Furthermore, a stabilizing bearing 11 is arranged inside the end cover 10 .

[0020] Furthermore, the side of the low-noise motor 1 is also covered with air guide tube sound-absorbing cotton 15, and the thickness of the air guide tube sound-absorbing cotton 15 is 15 mm.

[0021] Furthermore, the inner side of the fan air guide tube 2 is covered with top sound-absorbing cotton 16, and the thickness of the top sound-absorbing cotton 16 is 25 mm.

[0022] The frequency conversion logic of this application is as follows: The fan is controlled by a speed control strategy. When the main motor load is in the range of 85%-100%, the fan speed is set to 100%; if the main motor load is between 65%-85%, the fan speed is adjusted to 80%; when the load drops to 50%-65%, the fan speed is matched to 60%; if the load further drops to 30%-50%, the fan speed is set to 45%; and when the main motor load is less than 30%, the fan speed is matched to 30%. This control method is implemented through the frequency converter and PLC system, aiming to ensure that under most working conditions of the top drive load, the fan speed can be kept below 60%, thereby controlling the fan noise within 83.5dB, thereby significantly reducing the fan noise.

[0023] Beneficial effects of the present invention: The present application sets up a motor heat dissipation duct, and sets sound-absorbing cotton inside the duct, and through frequency conversion, the fan speed is reduced under most industrial control conditions under load, thereby reducing the noise level when the motor is working, reducing the impact on the health of construction workers, and improving work efficiency.

[0024] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A variable frequency speed regulation top drive noise reduction device, It is characterized in that The invention comprises a low-noise motor (1), a fan air guide tube (2) is arranged above the low-noise motor (1), and a motor rotor (6) is fixed to a top drive hollow shaft (13) through an expansion sleeve (5), a motor stator (7) is arranged outside the motor rotor (6), the upper end of the motor stator (7) is fixed to a top drive lifting box (4) through bolts, the lower end of the motor stator (7) is fixed through an end cover (10), a terminal box (8) is arranged at the lower end of the end cover (10), and an air outlet louver (9) is arranged outside the end cover (10), and a fan volute (3) is arranged at the top of the top drive hollow shaft (13).

2. A variable frequency speed regulation top drive noise reduction device according to claim 1, It is characterized in that The end cover (10) further comprises an inner positioning sleeve (14) disposed on the inner side thereof, and the top drive hollow shaft (13) passes through the inner positioning sleeve (14).

3. A variable frequency speed regulation top drive noise reduction device according to claim 1, It is characterized in that It also includes a top drive hollow shaft (13) with an outer sealing ring (12) sleeved on the outer side.

4. A variable frequency speed regulation top drive noise reduction device according to claim 1, It is characterized in that The end cover (10) further comprises a centering bearing (11) arranged on the inner side thereof.

5. A variable frequency speed regulation top drive noise reduction device according to claim 1, It is characterized in that The side of the low-noise motor (1) is also covered with air guide tube sound-absorbing cotton (15), and the thickness of the air guide tube sound-absorbing cotton (15) is 15 mm.

6. A variable frequency speed regulation top drive noise reduction device according to claim 1, It is characterized in that The inner side of the fan air guide tube (2) is covered with top sound-absorbing cotton (16), and the thickness of the top sound-absorbing cotton (16) is 25 mm.

7. A noise reduction method for a speed-variable frequency top drive noise reduction device, based on a speed-variable frequency top drive noise reduction device as claimed in claims 1-6, It is characterized in that Including the following: Use speed control strategy to control the fan. When the main motor load is in the range of 85%-100%, the fan speed is set to 100%; if the main motor load is between 65%-85%, the fan speed is adjusted to 80%; when the load drops to 50%-65%, the fan speed is matched to 60%; if the load further drops to 30%-50%, the fan speed is set to 45%; and when the main motor load is less than 30%, the fan speed is matched to 30%.

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