Exhaust fan stop mechanism

Abstract

This utility model discloses a stop mechanism for an induced draft fan, including a metal support, a slider, a fixed block, an adjusting screw, and a stop block. The metal support is fixed to the upper surface of a concrete base and located below the coupling connecting the motor shaft of the drive motor and the fan shaft. A fixed block is fixed on the metal support, and an adjusting screw is threaded perpendicularly to the surface of the fixed block. One end of the adjusting screw is rotatably connected to the slider via a bearing. A stop block is provided on one side of the slider. Under the action of the adjusting screw, the stop block abuts against the surface of the coupling to prevent it from rotating. This stop mechanism for the induced draft fan can effectively prevent the fan shaft from reversing under negative pressure, protect the equipment from damage, and greatly improve ease of use.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically to a stop mechanism for an induced draft fan. Background Technology

[0002] During the purification of electrolytic flue gas, the purification system has three induced draft fans, normally two in use and one on standby. Because the main flue and the flue gas outlet pipe of each induced draft fan are connected in series, the flap valve at the flue gas outlet pipe cannot be closed tightly, causing the standby induced draft fan to always rotate in reverse under negative pressure. The drive motor that drives the impeller of the induced draft fan does not have a brake, which will cause varying degrees of damage to the impeller, fan shaft, motor, etc. The current method is to use wooden sticks to jam the fan shaft to prevent it from rotating, which is not only time-consuming and laborious, but also poses a safety hazard. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a fan stop mechanism that can effectively prevent the fan shaft from reversing under negative pressure, protect the equipment from damage, and is safe and convenient to operate, thus effectively solving the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a stop mechanism for an induced draft fan, comprising a metal support, a slider, a fixed block, an adjusting screw, and a stop block. The metal support is fixed on the upper surface of a concrete base and located below the coupling connecting the motor shaft of the drive motor and the fan shaft. A fixed block is fixed on the metal support, and an adjusting screw is threaded perpendicularly to the surface of the fixed block. One end of the adjusting screw is rotatably connected to the slider via a bearing. A stop block is provided on one side of the slider. Under the action of the adjusting screw, the stop block abuts against the surface of the coupling to prevent it from rotating.

[0005] As a preferred embodiment of this utility model, the stop block is a metal block with an arc-shaped bend, and the head of the stop block has an arc-shaped structure.

[0006] As a preferred embodiment of this utility model, the number of stop blocks is two, and the two stop blocks are fixed to one side of the slider in the upper and lower directions.

[0007] As a preferred technical solution of this utility model, the outer surface of the contact end of the stop block with the coupling is wrapped with a wear-resistant rubber strip.

[0008] As a preferred embodiment of this utility model, the upper surface of the metal support is provided with a groove, a slide rod is provided in the groove, and the lower end of the slider is slidably connected to the outer side of the slide rod.

[0009] Compared with the prior art, the beneficial effects of this utility model are: the design of the induced draft fan stop mechanism is reasonable and ingenious. By adjusting the lead screw to control the movement of the slider, the stop block is made to abut against the outer side of the coupling, thereby preventing the fan shaft and motor shaft from rotating and avoiding damage. It saves time and effort, and is safe and practical. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is the front view of the present utility model;

[0012] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 4 for Figure 2 Sectional view at point BB.

[0014] In the figure: 1 Metal support, 2 Slider, 3 Adjusting screw, 4 Fixing block, 5 Groove, 6 Slide rod, 7 Stop block, 8 Concrete base, 9 Drive motor, 10 Motor shaft, 11 Fan shaft, 12 Coupling, 13 Exhaust fan housing, 14 Flue gas outlet pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments (for ease of description and understanding, hereinafter referred to as...). Figure 2 (The above is described above). Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: a fan stop mechanism, including a metal support 1, a slider 2, a fixing block 4, an adjusting screw 3 and a stop block 7;

[0017] Metal support 1, drive motor 9 and induced draft fan housing 13 are all fixed on concrete base 8. The motor shaft of drive motor 9 is connected to fan shaft 11 through coupling 12. One end of fan shaft 11 is connected to impeller. Impeller is located in induced draft fan housing 13. Flue gas outlet pipe 14 is provided on one side of induced draft fan housing 13. The rotation of impeller draws flue gas into induced draft fan housing 13 and then introduces it into the main flue from flue gas outlet pipe 14.

[0018] Metal support 1 is located below coupling 12. Fixed block 4 is fixed on metal support 1. Adjusting screw 3 is threaded perpendicular to the surface of fixed block 4. One end of adjusting screw 3 is rotatably connected to slider 2 through bearing. Stop block 7 is provided on one side of slider 2. When not in operation, stop block 7 moves under the action of adjusting screw 3, thereby pressing against the surface of coupling 12 to prevent it from rotating.

[0019] To improve the clamping effect on the surface of the coupling 12, the stop block 7 is a metal block with an arc-shaped bend, and the head of the stop block 7 has an arc-shaped structure.

[0020] To improve the stopping effect of preventing the coupling 12 from rotating, two stop blocks 7 are used, and the two stop blocks 7 are fixed on one side of the slider 2 in the upper and lower directions.

[0021] In order to increase the friction between the stop block 7 and the surface of the coupling 12, enhance the stopping force, and reduce the wear of the stop block 7, the outer surface of the contact end of the stop block 7 with the coupling 12 is wrapped with a wear-resistant rubber strip.

[0022] In order to improve the smoothness of the movement of the stop block 7 and provide effective support for the slider 2 to ensure the stability of the stop block 7, the upper surface of the metal support 1 is provided with a groove 5, and a slide rod 6 is provided in the groove 5. The lower end of the slider 2 is slidably connected to the outer side of the slide rod 6.

[0023] When in use: When this induced draft fan is not in use and the other two induced draft fans are in use, by rotating the adjusting screw 3, the slider 2 is pushed to move, which in turn drives the stop block 7 to abut against the surface of the coupling 12, preventing the motor shaft 10 and the fan shaft 11 from rotating, avoiding wear and tear on the impeller, motor shaft 10, fan shaft 11 and other equipment, and greatly improving the convenience of use.

[0024] The parts of the utility model not described in detail are prior art. Although embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A stop mechanism for an induced draft fan, characterized in that: The device includes a metal support (1), a slider (2), a fixing block (4), an adjusting screw (3), and a stop block (7). The metal support (1) is fixed on the upper surface of the concrete base (8) and located below the coupling (12) connecting the motor shaft (10) of the drive motor (9) and the fan shaft (11). The fixing block (4) is fixed on the metal support (1). The adjusting screw (3) is threaded perpendicularly to the surface of the fixing block (4). One end of the adjusting screw (3) is rotatably connected to the slider (2) through a bearing. A stop block (7) is provided on one side of the slider (2). The stop block (7) abuts against the surface of the coupling (12) under the action of the adjusting screw (3) to prevent it from rotating.

2. The induced draft fan stop mechanism according to claim 1, characterized in that: The stop block (7) is a metal block with an arc-shaped bend, and the head of the stop block (7) has an arc-shaped structure.

3. The induced draft fan stop mechanism according to claim 1, characterized in that: The number of stop blocks (7) is two, and the two stop blocks (7) are fixed on one side of the slider (2) in the upper and lower directions.

4. The induced draft fan stop mechanism according to claim 1, characterized in that: The outer surface of the contact end between the stop block (7) and the coupling (12) is wrapped with a wear-resistant rubber strip.

5. The induced draft fan stop mechanism according to claim 1, characterized in that: The upper surface of the metal support (1) is provided with a groove (5), and a slide rod (6) is provided in the groove (5). The lower end of the slider (2) is slidably connected to the outer side of the slide rod (6).

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