CN111577665A - Large air volume and low noise vertical installation axial flow fan for integrated pipe gallery - Google Patents

Abstract

The invention discloses a large air volume and low noise vertical installation axial flow fan for an integrated pipe gallery, which includes a wind duct, a motor, a wheel hub and blades. The hub is fixedly connected to the output shaft of the motor, the blades are fixedly connected to the side wall of the hub, and also includes an air outlet equalizing and silencing guide vanes, and the air outlet equalizing and silencing guide vanes are located at the One end of the air duct is provided with an air outlet equalizing and silencing guide vanes at one end of the air duct, and the airflow generated inside the fan first flows through the air outlet equalizing and silencing guide vanes between the outflow air ducts. The flow rate and pressure energy level of the performance, and the custom-designed special muffler device; the main materials are galvanized steel sheet, galvanized muffler porous plate, and muffler cotton material; material, which can effectively reduce the sound power noise of the air flowing through it.

Description

Large air volume and low noise vertical installation axial flow fan for integrated pipe gallery

technical field

The invention relates to the technical field of a comprehensive pipe gallery ventilation system, and the specific field is a large air volume and low noise vertical installation axial flow fan for a comprehensive pipe gallery.

Background technique

The ventilation system of the integrated pipe gallery is an essential guarantee for the safety of equipment operation and the safety of operators in the pipe gallery. The ventilation system needs to be equipped with a large number of axial fans. Since the integrated pipe gallery passes through the center of the city, the fan noise needs to be strictly controlled. Therefore, the current pipe gallery usually uses a large number of fans with small air volume. Usually, according to the civil structure of the integrated pipe gallery, all fans of the ventilation system need to be installed in the top air well of the pipe gallery, and are arranged in a "line" arrangement along the top of the pipe gallery, and the vertical installation method is adopted. Many fans make the civil construction investment and equipment investment of the ventilation system larger, and the operating cost is higher and the maintenance workload is heavy.

If the performance of all fans is integrated and completed by one fan, equipment investment and civil installation costs will be greatly reduced, and the operating efficiency of the fan will be improved, the ventilation system will be energy-saving operation, and equipment maintenance will also be reduced. At present, the diameter of the impeller of the axial flow fan with large air volume is usually more than 2000mm, but the operating noise is relatively large. The noise 1 meter away from the fan outlet is usually above 90dB(A). Even if a muffler is used, due to the limitation of installation space, the The sound volume can only drop by 12-15dB(A) at most, which cannot meet the environmental noise requirements below 65dB(A).

The vertical installation axial flow fan with large air volume and low noise for integrated pipe gallery is a combination of the fan body structure and the muffler structure, using a large-sized impeller of special materials and a special low-speed motor, and no muffler is used. Axial flow fans whose noise is controlled below 70dB(A) 1 meter away from the fan outlet.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a vertical installation axial flow fan with large air volume and low noise for integrated pipe gallery, so as to solve the problems raised in the above background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: a large air volume and low noise vertical installation axial flow fan for an integrated pipe gallery, including a wind duct, a motor, a hub and a blade, and the motor is fixedly connected to the wind duct through a connecting plate. At the inner axis of the motor, the hub is fixedly connected to the output shaft of the motor, the blades are fixedly connected to the sidewall of the hub, and also includes an air outlet equalizing flow and noise reduction guide vanes, the air outlet The equalizing and sound-absorbing guide vanes are located at one end of the air duct.

Preferably, the air outlet equalizing and silencing guide vanes comprise an installation ring and an equalizing guide vane, and the equalizing guide vanes are evenly distributed on the outer surface of the mounting ring.

Preferably, the flow equalizing guide vane is made of galvanized sound-absorbing porous plate, and the mounting ring is made of galvanized steel plate.

Preferably, the outer surface of the equalizing guide vane is wrapped with sound-absorbing cotton.

Preferably, the outer surface of the air duct is provided with a plurality of mounting feet, and elastic pieces are respectively provided at the mounting feet.

Preferably, the blade is made of high-strength glass fiber and resin, and the blade adopts a high-efficiency airfoil blade.

Preferably, bolts are used between the hub and the corresponding blades.

Preferably, the inner wall of the air duct is provided with muffler cotton.

Preferably, protective nets are respectively provided at both ends of the air duct.

Compared with the prior art, the beneficial effect of the present invention is that: the axial flow fan is vertically installed with large air volume and low noise in the integrated pipe gallery, and the air flow generated inside the fan is reduced by setting the air outlet at one end of the air duct with equalizing and sound-absorbing guide vanes. Between the outgoing air ducts, the equalizing muffler guide vanes flow through the air outlet first. This part is a special muffling device custom-designed according to the flow rate and pressure energy level of aerodynamic performance; the main materials are galvanized steel sheet, galvanized muffler Acoustic perforated plate and muffler cotton material; the equalizing guide vane is made of galvanized muffled perforated plate and muffling cotton material, which can effectively reduce the sound power noise of the airflow passing through; the installation angle of the equalizing guide vane is related to the airflow speed of the fan Angle matching, the device can straighten out the high-speed airflow pressurized from the impeller, greatly reducing the turbulent noise.

Description of drawings

Fig. 1 is the front sectional structure schematic diagram of the present invention;

Fig. 2 is the top sectional structure schematic diagram of the present invention;

FIG. 3 is a schematic top-view structural diagram of an air outlet equalizing and sound-absorbing guide vane of the present invention;

Fig. 4 is a schematic view of enlarged structure at place A in Fig. 1;

FIG. 5 is an enlarged schematic view of the structure at B in FIG. 1 .

In the picture: 1-Air duct, 2-Motor, 3-Hub, 4-Blade, 5-Air outlet equalizing muffler guide vane, 501-Installation ring, 502-Current equalizing guide vane, 6-Mounting foot, 7- Elastic parts, 8-protective net.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Figures 1-5, the present invention provides a technical solution: a large air volume and low noise vertical installation axial flow fan for an integrated pipe gallery, including a fan duct 1, a motor 2, a hub 3 and a blade 4, as shown in Figure 1, The motor 2 is fixedly connected to the inner axis of the air duct 1 through a connecting plate 5. The number of the connecting plates 5 is two, and is fixedly connected to the inner side wall of the air duct 1 by bolts. The motor 2 is located between the two connecting plates 5. The motor 2 is a special low-speed, F-class motor, which is installed vertically and can carry an increased axial load. The hub 3 is fixedly connected to the motor. On the output shaft of 2, the blade 4 is fixedly connected to the side wall of the hub 3. The hub 3 is made of Q235 carbon steel to ensure strength and toughness. As shown in Figure 2, the number of the blades 4 It is three, and also includes an air outlet equalizing and silencing guide vane 5, the air outlet equalizing and silencing guide vane 5 is located at one end of the air duct 1, and the fan is guided by the air outlet equalizing and silencing. One end of the leaf 5 is supplied with air.

Specifically, as shown in FIG. 3 , the air outlet flow equalization and noise reduction guide vane 5 includes an installation ring 501 and a flow equalization guide vane 502 . The installation ring 501 is annular, and the installation ring 501 is connected to the The air duct 1 is coaxially arranged, the flow-equalizing guide vanes 502 are evenly distributed on the outer surface of the mounting ring 501, and one end of the flow-equalizing guide vane 502 is fixedly connected to the outer surface of the mounting ring 501, so The other ends of the flow-sharing guide vanes 502 are respectively fixedly connected to the inner surface of the air duct 1 , the end surfaces of the flow-sharing guide vanes 502 are arc-shaped, and the flow-sharing guide vanes 502 and the mounting ring 501 They are installed at a certain angle, and the installation angle of the equalizing guide vanes 502 matches the airflow velocity angle of the blades 4. The device can straighten out the high-speed airflow pressurized from the inside of the air duct 1 and greatly reduce turbulence. noise, so as to achieve the purpose of noise reduction.

Specifically, the flow equalizing guide vane 502 is made of galvanized sound-absorbing porous plate, and the mounting ring 501 is made of galvanized steel plate, which is made of galvanized sound-absorbing porous plate, so that the air flowing through it flows into the surface of the Inside the hole, the air flow time is prolonged, and the vibration generated by the air is absorbed, so as to further reduce noise. Second, the mounting ring 501 is made of galvanized steel plate, so as to ensure its strength and prevent the device from being deformed during operation. This affects its noise reduction effect.

Specifically, the outer surface of the equalizing guide vane 502 is wrapped with sound-absorbing cotton, and the outer surface of the equalizing guide vane 502 is wrapped with sound-absorbing cotton. Different fibers are processed into rolls/sheets by various processes. Two-component sound-absorbing cotton is widely used. Polyester sound-absorbing cotton is one of them. 100% polyester fiber is hot-pressed with high technology It is composed of cocoon cotton shape, the sound absorption coefficient reaches 0.94 in the noise range of 125-4000HZ, soft and rich natural material texture experience, a variety of modern colors to choose from, simple decorative shape, and has good flame retardancy, and at the same time It has good physical stability, which determines that it will not expand and shrink due to changes in temperature and temperature. It has a soft, natural texture, high elasticity, and will not break under huge external impact. It is a good noise reduction material.

Specifically, as shown in FIG. 1 , the outer surface of the air duct 1 is provided with a plurality of mounting feet 6 , and the mounting feet 6 are respectively provided with elastic members 7 , and the elastic members 7 play the role of shock absorption , the vibration isolation efficiency is more than 92%, the service life is long, and the vibration of the fan can be effectively isolated and the installation foundation can be protected. As shown in Figure 4, the outer part of the elastic member 7 is provided with a casing, and the casing is composed of the upper and lower casings. The upper and lower shells can slide against each other, and a closed space is formed between the two shells, and the elastic member 7 is located inside the closed space, thereby protecting the elastic member 7 and increasing the aesthetic appearance. Spend.

Specifically, the blade 4 is made of high-strength glass fiber and resin, which eliminates the noise caused by the impact of the airflow on the metal; at the same time, the impeller is light in weight and has a small moment of inertia, which reduces the start and stop time of the motor, delays the overall service life of the equipment, and The blade 4 adopts a high-efficiency airfoil blade shape, the airflow is stable, and the turbulent noise is reduced to a certain extent.

Specifically, as shown in FIG. 5 , the hub 3 and the corresponding blades 4 are connected by bolts, the hub 3 adopts a sandwich type, and the blade 4 is provided with a leaf handle at one end close to the hub 3 , The leaf handle is located inside the wheel hub 3 , the wheel hub 3 clamps the leaf stem, and is fixed by bolts, so that the wheel hub 3 becomes a whole.

Specifically, the inner wall of the air duct 1 is provided with muffling cotton, and the air duct 1 is formed by integral flanging of high-quality carbon steel with high roundness, which ensures that the gap between the blade 4 and the air duct 1 is uniform and reduces the Turbulence noise; the inner wall of the air duct 1 is equipped with galvanized muffler perforated plate and muffler cotton, which can effectively reduce the airflow noise; at the same time, the air duct is light in weight and good in rigidity, and the load on the roof is light.

Specifically, the two ends of the air duct 1 are respectively provided with protective nets 8 to prevent foreign objects from being sucked into the fan, which not only protects the fan, but also protects the safety of the ventilation system.

Working principle: when the present invention is used, the motor 2 drives the hub 3 to rotate, so that the hub 3 drives the blades 4 to rotate to supply air. The high-speed airflow that comes out greatly reduces the turbulent noise.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The standard parts used in the present invention can be purchased from the market, the special-shaped parts can be customized according to the description in the specification and the drawings, and the specific connection methods of each part adopt mature bolts, rivets, welding, etc. in the prior art Conventional means, machinery, parts and equipment all adopt conventional models in the prior art, and circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. Utility tunnel is with vertical installation axial fan of big amount of wind low noise, including dryer (1), motor (2), wheel hub (3) and blade (4), motor (2) are in through connecting plate (5) fixed connection the inside axle center department of dryer (1), wheel hub (3) fixed connection be in on the output shaft of motor (2), blade (4) fixed connection be in on the lateral wall of wheel hub (3), its characterized in that: the air outlet flow equalizing noise elimination guide vane (5) is further included, and the air outlet flow equalizing noise elimination guide vane (5) is located at one end of the air duct (1).

2. The large-air-volume low-noise vertical installation axial flow fan for the comprehensive pipe rack according to claim 1, characterized in that: the air outlet flow equalizing noise reduction guide vane (5) comprises a mounting ring (501) and flow equalizing guide vanes (502), and the flow equalizing guide vanes (502) are uniformly distributed on the outer surface of the mounting ring (501).

3. The large-air-volume low-noise vertical axial flow fan for the comprehensive pipe rack according to claim 2, characterized in that: the flow equalizing guide vane (502) is made of a galvanized silencing porous plate, and the mounting ring (501) is made of a galvanized steel plate.

4. The large-air-volume low-noise vertical axial flow fan for the comprehensive pipe rack according to claim 3, characterized in that: the outer surface of the flow equalizing guide vane (502) is wrapped with sound attenuation cotton.

5. The large-air-volume low-noise vertical installation axial flow fan for the comprehensive pipe rack according to any one of claims 1 to 3, characterized in that: the outer surface of the air duct (1) is provided with a plurality of mounting feet (6), and the mounting feet (6) are respectively provided with an elastic part (7).

6. The large-air-volume low-noise vertical installation axial flow fan for the comprehensive pipe rack according to any one of claims 1 to 3, characterized in that: the blade (4) is synthesized by high-strength glass fiber and resin, and the blade (4) is of an efficient wing profile.

7. The large-air-volume low-noise vertical installation axial flow fan for the comprehensive pipe rack according to any one of claims 1 to 3, characterized in that: the hub (3) and the corresponding blade (4) are connected through bolts.

8. The large-air-volume low-noise vertical installation axial flow fan for the comprehensive pipe rack according to any one of claims 1 to 3, characterized in that: the inner wall of the air duct (1) is provided with silencing cotton.

9. The large-air-volume low-noise vertical installation axial flow fan for the comprehensive pipe rack according to any one of claims 1 to 3, characterized in that: and two ends of the air duct (1) are respectively provided with a protective net (8).

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