Induced draft fan of boiler

Abstract

The utility model relates to a boiler induced draft fan which comprises a sound insulation cover and a support arranged in the sound insulation cover, a bearing seat and a volute are installed on the support, a rotating shaft is arranged on the bearing seat in a rotating mode, one end of the rotating shaft extends into the volute and is provided with an impeller, the other end of the rotating shaft is in transmission connection with a motor, and a supporting plate and a bottom plate are arranged at the bottom of the support respectively. The multiple air bags and the damping assemblies are arranged between the supporting plate and the bottom plate, noise in the operation process is absorbed and blocked through the sound insulation cover, the influence of the noise on the surrounding environment is remarkably reduced, meanwhile, the weight of the whole equipment is supported through the air bags, and when the induced draft fan operates, vibration generated by the equipment can be absorbed and relieved through the elasticity of the air bags; and vibration generated when the air bag rebounds after vibration absorption is restrained through the damping assembly, so that vibration attenuation is accelerated, equipment is protected, and meanwhile vibration propagation is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler induced draft fan technology field, concretely relates to a boiler induced draft fan. BACKGROUND

[0002] The boiler induced draft fan plays a vital role in the garbage incineration power generation process, which is mainly used for inhaling external air and delivering it to the inside of the boiler, ensuring that the combustion reaction has enough oxygen to proceed, improving the combustion efficiency and power generation efficiency, reducing energy waste and pollutant emissions caused by incomplete combustion, and also used for extracting flue gas from the boiler, maintaining the negative pressure state in the hearth, preventing flue gas and flame from leaking into the surrounding environment, and protecting the safety of the operators.

[0003] However, the induced draft fan produces a lot of noise during operation, part of which is wind noise generated during operation, and the other part is caused by vibration. The vibration of the fan not only directly produces noise, but also transmits to the stratum or building structure through the foundation bearing the machine, further amplifying the noise. Workers exposed to high decibel noise for a long time are prone to hearing damage, and also distract attention and reduce work efficiency. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a boiler induced draft fan.

[0005] The utility model discloses a boiler induced draft fan, which can achieve the purpose of reducing noise and improving the working environment.

[0006] Preferably, the end of the motor away from the bearing seat is provided with an axial fan.

[0007] Preferably, the damping assembly comprises a shell, a support rod, a conical spring arranged opposite to the shell, a retaining ring arranged between the conical springs, pressure plates arranged on both sides of the retaining ring, damping blocks arranged between the two pressure plates and abutting against the inner wall of the shell, a hole formed in the middle of the retaining ring and the pressure plates, and a bolt screwed with the support rod arranged in the hole.

[0008] Preferably, the inner side of the damping block is provided with an elastic ring.

[0009] Preferably, the bottom of the conical spring on the lower side of the shell is provided with a buffer block.

[0010] Preferably, the soundproof cover is provided with a cooling fan.

[0011] Preferably, rubber plates are arranged between the support plates and the support.

[0012] The utility model discloses a beneficial effect is: through sound insulation cover absorbs and blocks the noise in the operation process, the influence of noise to the surrounding environment is reduced significantly, simultaneously, through the air bag support the weight of whole equipment, when the induced draft fan operates, the elasticity of air bag can absorb and slow down the vibration of equipment, then through the damping component to restrain the vibration of air bag when rebounding, thereby accelerating the attenuation of vibration, protecting equipment and reducing the propagation of vibration. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model makes further explanation to the utility model with the drawings, but the embodiment in the drawing does not constitute any limitation to the utility model, and for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to the following drawings.

[0014] Figure 1 It is a structure schematic diagram of a boiler induced draft fan of the utility model.

[0015] Figure 2 It is another structure schematic diagram of a boiler induced draft fan of the utility model.

[0016] Figure 3 It is a sectional view of the damping component of a boiler induced draft fan of the utility model.

[0017] Figure 4 It is an explosion view of the damping component of a boiler induced draft fan of the utility model.

[0018] The reference signs shown in the drawing are as follows: 1, sound insulation cover;2, support;3, volute;4, bearing seat;5, motor;6, rotating shaft;7, support plate;8, bottom plate;9, damping component;901, shell;902, support rod;903, conical spring;904, retaining ring;905, pressure bearing plate;906, damping block;907, bolt;908, elastic ring;909, buffer block;10, air bag;11, axial flow fan;12, heat dissipation fan;13, rubber plate. DETAILED DESCRIPTION

[0019] It should be noted that if the embodiment of the utility model has directionality indication (such as up, down, left, right, front, back, etc.), then the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawing), if the specific posture changes, then the directionality indication also changes accordingly.

[0020] In addition, the technical solutions among various embodiments can be combined with each other, but must be based on that a person skilled in the art can realize, when the combination of the technical solutions appears contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope required by the utility model.

[0021] The technical solutions of the utility model will be clearly and completely described below in combination with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by a person skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] Referring to Figures 1 to 4 As shown in the figure, the structure of the utility model is: a boiler induced draft fan, including a soundproof cover 1, a support 2 arranged in the soundproof cover 1, a bearing seat 4 and a volute 3 are installed on the support 2, the volute 3 is provided with an air inlet and an air outlet, a rotating shaft 6 is rotatably arranged on the bearing seat 4, one end of the rotating shaft 6 extends into the volute 3 and is provided with an impeller, the other end of the rotating shaft 6 is drivingly connected with a motor 5, the motor 5 drives the impeller to rotate through the rotating shaft 6 to generate airflow, air is sucked from the air inlet, after acceleration and compression by the impeller in the volute 3, the air is discharged from the air outlet, thereby increasing the negative pressure inside the furnace, promoting combustion, at the same time, under the action of the soundproof cover 1, the noise generated in this process can be effectively absorbed and blocked, significantly reducing the influence of noise on the surrounding environment, the bottom of the support 2 is respectively provided with a support plate 7 and a bottom plate 8, a plurality of air bags 10 and damping assemblies 9 are arranged between the support plate 7 and the bottom plate 8, the air bags 10 are mainly used for supporting the weight of the entire equipment, the elasticity of the air bags 10 can absorb and slow down the vibration generated by the equipment when the induced draft fan is running, at the same time, the vibration of the air bags 10 when rebounding after absorbing vibration is inhibited through the damping assemblies 9, thereby accelerating the attenuation of vibration, protecting the equipment and reducing the propagation of vibration.

[0023] As Figure 1 , Figure 2 As shown in the figure, an axial fan 11 is installed on the motor 5 away from the bearing seat 4, forced ventilation is carried out through the axial fan 11 to take away heat, keeping the temperature rise of the motor 5 within the allowable range, so that the motor 5 can be prevented from being damaged due to overheating, ensuring the stable operation of the induced draft fan.

[0024] As Figure 3 , Figure 4As shown, the damping assembly 9 comprises a shell 901, a support rod 902, the shell 901 is provided with a conical spring 903, the conical spring 903 is provided with a blocking ring 904, the two sides of the blocking ring 904 are provided with a pressure plate 905, the two pressure plates 905 are provided with a damping block 906 abutting the inner wall of the shell 901, a hole is formed in the middle of the blocking ring 904 and the pressure plate 905, a bolt 907 is arranged in the hole and is screwed with the support rod 902, the support rod 902 is connected with the bottom of the support plate 7, the shell 901 is connected with the bottom plate 8, when subjected to external impact, the conical spring 903 will be compressed and deformed, the damping block 906 will consume energy through friction and viscous effect with the inner wall of the shell 901, and absorb the vibration of the device and the shock when the air bag 10 rebounds after absorbing vibration.

[0025] As shown in Figure 3 , Figure 4 , the inner side of the damping block 906 is provided with an elastic ring 908, which ensures that the damping block 906 always abuts the inner wall of the shell 901, and at the same time makes the damping block 906 exert a certain pressure on the inner wall of the shell 901, increases the friction force, and improves the damping effect.

[0026] As shown in Figure 3 , Figure 4 , the bottom of the conical spring 903 on the lower side in the shell 901 is provided with a buffer block 909, which is used to isolate the vibration generated by the conical spring 903 during work.

[0027] As shown in Figure 1 , the soundproof cover 1 is provided with a cooling fan 12, which is used to exhaust the heat generated by the equipment in the soundproof cover 1 during operation, so as to avoid performance degradation or damage due to overheating.‌

[0028] As shown in Figure 2 , a rubber plate 13 is arranged between the support plate 7 and the support 2, which is used to avoid resonance between the support plate 7 and the support 2.

[0029] In specific use, the motor 5 drives the impeller to rotate through the rotating shaft 6 to generate air flow, absorbs air from the air inlet, and after acceleration and compression in the volute 3, discharges from the air outlet, thereby increasing the negative pressure inside the furnace, promoting combustion, and under the action of the soundproof cover 1, the noise generated in this process can be effectively absorbed and blocked, significantly reducing the influence of noise on the surrounding environment. At the same time, the weight of the entire equipment is supported by the air bag 10, and the elasticity of the air bag 10 can absorb and slow down the vibration generated by the equipment when the induced draft fan is running, and then the damping assembly 9 is used to suppress the shock when the air bag 10 rebounds after absorbing vibration, thereby accelerating the attenuation of vibration, protecting the equipment and reducing the propagation of vibration.

[0030] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be understood as the limitation of the essence and range of the utility model, and various modifications made by the ordinary skilled in the art after reading the above embodiments belong to the range protected by the utility model.

Claims

1. A boiler induced draft fan characterized by: The utility model relates to a sound insulation cover (1), support (2) set up in sound insulation cover (1), bearing seat (4), volute (3) are installed on support (2), bearing seat (4) are rotationally equipped with pivot shaft (6), one end of pivot shaft (6) extends to volute (3) and is equipped with impeller, the other end of pivot shaft (6) is driven connection has motor (5), the bottom of support (2) is equipped with support plate (7) respectively, bottom plate (8), a plurality of air bags (10) and damping assembly (9) are equipped between support plate (7), bottom plate (8), damping assembly (9) includes shell (901), support rod (902), the relative taper spring (903) is equipped with in shell (901), the taper spring (903) between is equipped with fender ring (904), the both sides of fender ring (904) are equipped with pressure plate (905), and the pressure plate (905) between two is equipped with the damping block (906) with shell (901) inner wall abutment, the hole is set up in fender ring (904), pressure plate (905) middle, the bolt (907) of screw connection with support rod (902) is equipped with in the hole.

2. A boiler induced draft fan as set forth in claim 1 wherein: The end of motor (5) away from bearing seat (4) is installed with axial fan (11).

3. A boiler induced draft fan as set forth in claim 1 wherein: The inside of damping block (906) is equipped with elastic ring (908).

4. A boiler induced draft fan as set forth in claim 1 wherein: The bottom of taper spring (903) in shell (901) is equipped with buffer block (909) on the downside.

5. A boiler induced draft fan as set forth in claim 1 wherein: Sound insulation cover (1) is equipped with cooling fan (12).

6. A boiler induced draft fan as set forth in claim 1 wherein: The rubber plate (13) is equipped between support plate (7) and support (2).

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