Encoder protection system of cooling fan for variable frequency motor

Abstract

The encoder protection system of the cooling fan for the variable frequency motor comprises the variable frequency motor and the cooling fan for the variable frequency motor, and the variable frequency motor is provided with an encoder; the cooling fan for the variable frequency motor is characterized in that an encoder protection device is arranged in the cooling fan for the variable frequency motor, the cooling fan for the variable frequency motor is installed on the variable frequency motor, and the encoder protection device plays a role in protecting an encoder on the variable frequency motor; the encoder protection device is composed of a horn-shaped body and an installation support. The trumpet-shaped body is fixed in the cooling fan for the variable frequency motor through the mounting bracket; the encoder protection device is simple in structure and low in manufacturing cost, can effectively protect the encoder, and thoroughly solves the problem that the encoder is damaged by water vapor, water and fine dust under severe working conditions; the downtime is reduced, the cost of spare parts is reduced, the potential safety hazard of personnel is eliminated, and the production and equipment safety is ensured.

Description

Technical Field

[0001] The present invention relates to the field of electromechanical technology, and more specifically, to an encoder protection device for a cooling fan for a variable frequency motor. The device is used to effectively protect an encoder installed at the non-load end of the motor from damage to the normal operation of the encoder caused by moisture, water, and fine dust, and is widely used for the effective protection of encoders. Background Art

[0002] As we all know, encoders (whether incremental or absolute) are extremely precise electrical components used for automated detection. Moisture, water, and fine dust can have a significant detrimental effect on them. These particles can enter the encoder through the shaft seal, causing pulse loss at best and burnout at worst. These can lead to production downtime, and encoders are expensive, directly resulting in significant economic losses. Existing cooling fans for variable-frequency motors lack encoder protection. For example, the numerous rotary arm motors used in hot-rolled steel pipe production lines operate in extremely harsh conditions. While the cooling fan installed at the non-load side of the variable-frequency motor provides forced cooling, it also draws in large quantities of surrounding moisture, water, and fine dust (fine iron oxide) directly onto the encoder mounted on the motor's non-load side shaft. This dust then enters the encoder through the shaft seal, frequently causing encoder failure or damage and resulting in production line downtime, significantly impacting smooth production and economic efficiency. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned existing technology and provide an encoder protection device for a cooling fan for a variable frequency motor; it mainly solves the damage caused to the normal operation of the encoder by the existing cooling fan for a variable frequency motor without an encoder protection device.

[0004] The technical solution provided by the present invention is: an encoder protection system for a cooling fan for a variable frequency motor, comprising a variable frequency motor and a cooling fan for the variable frequency motor, an encoder being provided on the non-load end shaft of the variable frequency motor; the special feature of the system is that an encoder protection device is provided inside the cooling fan for the variable frequency motor, and the cooling fan for the variable frequency motor is installed on the variable frequency motor. At this time, the center line of the encoder protection device coincides with the center line of the encoder, and the encoder protection device protects the encoder on the variable frequency motor; the encoder protection device consists of a trumpet-shaped body and a mounting bracket; the trumpet-shaped body is fixed in the cooling fan for the variable frequency motor by the mounting bracket.

[0005] Furthermore, there are multiple mounting brackets, and the multiple mounting brackets are evenly distributed on the trumpet-shaped body.

[0006] Furthermore, the horn-shaped body covers an encoder on the variable frequency motor.

[0007] Beneficial effects of the present invention: 1. The encoder protection device is integrated with the cooling fan for the variable frequency motor to cover the encoder installed on the non-load end shaft of the variable frequency motor, implementing effective protection, thereby achieving the purpose of ensuring smooth production and improving economic benefits; 2. The structure is simple and the production cost is low; 3. After long-term on-site verification, it can effectively protect the encoder and completely solve the damage to the encoder caused by moisture, water, and fine dust under harsh working conditions; 4. It reduces downtime, reduces spare parts costs, eliminates personnel safety hazards, and ensures production and equipment safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure and assembly of the present invention; Figure 2 It is a schematic diagram of the structure and assembly of the encoder protection device of the present invention.

[0009] In the figure: 1. Frequency conversion motor, 2. Encoder, 3. Encoder protection device, 4. Cooling fan for frequency conversion motor, 31. Trumpet-shaped body, 32. Mounting bracket. DETAILED DESCRIPTION

[0010] To facilitate understanding and implementation, the following detailed description of an encoder protection system for a cooling fan for a variable-frequency motor, described in conjunction with the accompanying drawings, is provided as a specific embodiment. This embodiment is intended solely to illustrate the present invention and is not intended to limit its scope. For example, designs for encoder protection systems for cooling fans for variable-frequency motors that share similar or similar operating principles and workpiece standard component shapes can be considered.

[0011] like Figure 1 、 2As shown, an encoder protection system for a cooling fan for a variable frequency motor is first processed and manufactured into a trumpet-shaped body 31 of the encoder protection device 3 (it is recommended to use stainless steel plate, and the weld seam of the workpiece must be fully welded to prevent air leakage). The specific size is determined according to the size of the encoder 2, and the encoder 2 is completely covered. Then, three mounting brackets 32 are evenly welded to the trumpet-shaped body 31 at 120 degrees. The mounting brackets 32 can be a steel pipe with the inner hole tapped to form the encoder protection device 3. Then, the encoder protection device 3 is installed in the cooling fan 4 for the variable frequency motor, and the wall of the cooling fan 4 for the variable frequency motor is fixed. Open three holes at appropriate positions (or open appropriate long holes longitudinally to facilitate adjustment of the distance between the encoder guard 3 and the encoder 2), and use fixing bolts 33 to fix the encoder guard 3 and the cooling fan 4 for the variable frequency motor into one piece using three mounting brackets 32; install the encoder 2 on the non-load end shaft of the variable frequency motor 1; finally, install the cooling fan 4 for the variable frequency motor with the encoder guard 3 installed on the variable frequency motor 1. At this time, the center line of the encoder guard 3 coincides with the center line of the encoder 2, and the encoder guard 3 protects the encoder 2 on the variable frequency motor.

[0012] The encoder protection system of the cooling fan for the variable frequency motor of the present invention adopts an encoder protection device 3 and a cooling fan 4 for the variable frequency motor to be assembled into one body, and the encoder 2 installed on the non-load end shaft of the variable frequency motor 1 is completely covered to implement effective protection, thereby achieving the purpose of ensuring smooth production and improving economic benefits.

[0013] It should be understood that all technical features not elaborated in detail in this specification belong to the prior art. Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. A person of ordinary skill in the art can, under the guidance of the present invention, make more forms without departing from the scope of protection of the present invention and the claims, and all of these fall within the scope of protection of the present invention.

Claims

1. An encoder protection system for a cooling fan for a variable frequency motor, comprising a variable frequency motor (1) and a cooling fan (4) for the variable frequency motor, wherein an encoder (2) is provided on a non-load end shaft of the variable frequency motor (1); characterized in that: An encoder protection device (3) is provided inside the cooling fan (4) for the variable frequency motor. The cooling fan (4) for the variable frequency motor is mounted on the variable frequency motor (1). At this time, the center line of the encoder protection device (3) coincides with the center line of the encoder (2). The encoder protection device (3) plays a protective role for the encoder (2) on the variable frequency motor. The encoder protection device (3) consists of a trumpet-shaped body (31) and a mounting bracket (32). The trumpet-shaped body (31) is fixed in the cooling fan (4) for the variable frequency motor through the mounting bracket (32).

2. The encoder protection system for a cooling fan for a variable frequency motor according to claim 1, characterized in that: There are multiple mounting brackets (32), and the multiple mounting brackets (32) are evenly distributed on the trumpet-shaped body (31).

3. The encoder protection system for a cooling fan for a variable frequency motor according to claim 1, characterized in that: The horn-shaped body (31) covers the encoder (2) on the variable frequency motor (1).

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