CN219366363U

CN219366363U - Corrosion-resistant centrifugal fan

Info

Publication number: CN219366363U
Application number: CN202320633599.7U
Authority: CN
Inventors: 杜泽华; 马振兴
Original assignee: Hebei Zongtong Ventilation Equipment Manufacturing Co ltd
Current assignee: Hebei Zongtong Ventilation Equipment Manufacturing Co ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-07-18
Anticipated expiration: 2033-03-28

Abstract

The utility model discloses a corrosion-resistant centrifugal fan which comprises a frame, a motor, a bearing box, a main machine shell, an impeller, a main shaft and an anti-corrosion sleeve, wherein the anti-corrosion sleeve is tightly sleeved on the main shaft and is positioned on a shaft section in a cavity of the main machine shell, the inner end of the anti-corrosion sleeve is abutted against the rear end face of a hub of the impeller, and the outer end of the anti-corrosion sleeve extends out of a main shaft mounting hole of the main machine shell. The corrosion-resistant centrifugal fan can obviously improve the corrosion resistance of the shaft section of the working end of the main shaft and prolong the service life of equipment.

Description

Corrosion-resistant centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a corrosion-resistant centrifugal fan.

Background

The centrifugal fan is a machine for increasing the pressure of gas and discharging the gas by means of input mechanical energy. Centrifugal fans are widely used for ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial kilns; cooling and ventilation in air-conditioning devices and household appliances; drying and selecting grains; inflation and propulsion of wind tunnel wind source and air cushion ship, etc. In environments where corrosive gaseous media are transported, such as the exhaust of chemical plants or kiln furniture, centrifugal fans are often corrosive in the transported gaseous media, and in such situations corrosion resistant centrifugal fans are required.

Most of the current corrosion-resistant centrifugal fans are coated with a layer of corrosion-resistant material, such as a polypropylene coating and a hot galvanizing layer, etc., on the basis of the original centrifugal fans, namely all components contacting with a conveying medium, on the inner wall of a fan housing, impellers, deflectors, etc. Some corrosion-resistant centrifugal fans are manufactured from stainless steel materials to achieve corrosion resistance. The applicant finds out in a large number of practical experiences of production, manufacture, maintenance and maintenance of the corrosion-resistant centrifugal fan that the weak parts of the corrosion-resistant centrifugal fan are transmission main shafts, and the main shafts have the defects of high processing difficulty and low strength when the stainless steel shafts are adopted, so that the corrosion-resistant centrifugal fan is easy to bend and deform. When the main shaft of the fan adopts a carbon steel shaft, although the strength is not a problem, in order to obtain the corrosion-resistant effect, galvanization or corrosion-resistant coating is required, however, the stress condition of the shaft end is complex, the shaft end of the main shaft provided with the impeller is subjected to the action of repeatedly changing bending moment, the surface tension of the shaft end repeatedly changes, so that the coating is easy to fall off, and the corrosion-resistant effect is lost.

Accordingly, there is a need to develop a corrosion resistant centrifugal fan that addresses the above-described problems.

Disclosure of Invention

The utility model aims to provide a corrosion-resistant centrifugal fan which can obviously improve the corrosion resistance of a shaft section of a working end of a main shaft and prolong the service life of equipment.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model relates to a corrosion-resistant centrifugal fan, which comprises a frame, a motor, a bearing box, a main machine shell, an impeller, a main shaft and an anti-corrosion sleeve, wherein the anti-corrosion sleeve is tightly sleeved on the main shaft and is positioned on a shaft section in a cavity of the main machine shell, the inner end of the anti-corrosion sleeve is abutted against the rear end surface of a hub of the impeller, and the outer end of the anti-corrosion sleeve extends out of a main shaft mounting hole of the main machine shell.

Further, the impeller is mounted to the working end of the main shaft through a detachable stainless steel hub, the hub is mounted to the main shaft through a flat key, and the end of the hub is axially locked through a stainless steel end baffle.

Further, a blocking edge is arranged on the rear end face of the hub, and the blocking edge is sleeved on the inner end head of the anti-corrosion sleeve.

Further, a locking pin is arranged between the rear end face of the hub and the front end face of the anti-corrosion sleeve, the locking pin is a cylindrical pin, and a plurality of locking pins are uniformly distributed on the circumference.

Furthermore, the anti-corrosion sleeve is specifically made of polytetrafluoroethylene materials.

Further, the anti-corrosion sleeve comprises a sealing cover, the sealing cover is connected to the outer side of a main shaft mounting hole of the main machine shell through flange bolts, a lip-shaped sealing ring is arranged in a middle hole of the sealing cover, and the lip-shaped sealing ring seals a gap between the outer wall of the anti-corrosion sleeve and the main shaft mounting hole.

Further, the anti-corrosion sleeve is provided with a wear-resistant ring at the contact position with the lip-shaped sealing ring.

Further, an O-shaped ring for sealing is arranged between the sealing cover and the outer wall of the main machine shell.

Further, the end baffle is pressed onto the end face of the main shaft through an end sealing gasket.

Compared with the prior art, the utility model has the beneficial technical effects that:

according to the corrosion-resistant centrifugal fan, the corrosion-resistant sleeve is detachably arranged on the main shaft, and the corrosion-resistant sleeve isolates the surface of the main shaft and the conveyed corrosive gas medium, so that the main shaft is protected. Even if the corrosion damage occurs to the anti-corrosion sleeve, the anti-corrosion sleeve can be replaced and repaired during maintenance, so that the damage to the main shaft is avoided, and the service life of equipment is prolonged. The corrosion-resistant centrifugal fan can obviously improve the corrosion resistance of the shaft section of the working end of the main shaft and prolong the service life of equipment.

In addition, the impeller and the hub are detachably connected, the hub is made of stainless steel, and the impeller is made of carbon steel, so that the material cost can be reduced, and the hub is convenient to process and shape; the blocking edge is arranged on the rear end face of the hub, so that a press joint between the hub and the anti-corrosion sleeve can be shielded and protected, and the condition that the surface of the main shaft is contacted with corrosive gas medium is reduced. Through the setting of locking pin, can prevent that anticorrosive sleeve pipe from taking place to rotate for the main shaft and guarantee that both synchronous operation. The anticorrosive sleeve is manufactured by selecting the polytetrafluoroethylene material, so that the anticorrosive sleeve has a good corrosion resistance effect; by arranging the wear-resistant ring to be matched with the lip-shaped sealing ring of the sealing cover, a good sealing effect can be achieved.

Drawings

The utility model is further described with reference to the following description of the drawings.

FIG. 1 is a schematic diagram of a corrosion-resistant centrifugal fan in a three-dimensional structure;

FIG. 2 is a schematic diagram of a front view structure of the corrosion-resistant centrifugal fan of the utility model;

FIG. 3 is a schematic cross-sectional view of the spindle end mounting portion of the present utility model;

fig. 4 is a schematic view of a partial enlarged structure of the I portion in fig. 3.

Reference numerals illustrate: 1. a frame; 101. a small bracket; 2. a motor; 3. a bearing housing; 4. a main housing; 401. an air inlet; 5. an impeller; 6. a main shaft; 7. a belt pulley; 8. a hub; 801. a blocking edge; 9. an anti-corrosion sleeve; 901. a wear ring; 10. sealing cover; 11. an end sealing pad; 12. a flat key; 13. an end baffle; 14. an O-ring; 15. a lip seal; 16. and (5) a locking pin.

Detailed Description

The core of the utility model is to provide a corrosion-resistant centrifugal fan, which can obviously improve the corrosion resistance of the shaft section of the working end of the main shaft and prolong the service life of equipment.

The following description of the embodiments of the present utility model will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to the drawings, FIG. 1 is a schematic view of a three-dimensional structure of a corrosion-resistant centrifugal fan of the present utility model; FIG. 2 is a schematic diagram of a front view structure of the corrosion-resistant centrifugal fan of the utility model; FIG. 3 is a schematic cross-sectional view of the spindle end mounting portion of the present utility model; fig. 4 is a schematic view of a partial enlarged structure of the I portion in fig. 3.

In a specific embodiment, as shown in fig. 1 to 4, a corrosion-resistant centrifugal fan comprises a frame 1, a motor 2, a bearing box 3, a main machine shell 4, an impeller 5 and a main shaft 6, wherein the motor 2 and the main machine shell 4 are arranged on the frame 1, the bearing box 3 is elevated to the rear of the main machine shell 4 through a small bracket 101, the main shaft 6 is rotatably erected on the bearing box 3, and the working end of the main shaft 6 extends into the main machine shell 4 and is provided with the impeller 5. The inner wall of the main housing 4 and the entire surface of the impeller 5 are lined with a polyethylene or polypropylene coating. The output belt wheel of the motor 2 drives the belt wheel 7 at the input end of the main shaft 6 through a belt, the belt wheel 7 drives the main shaft 6 to rotate, and the main shaft 6 rotates to drive the impeller 5 to work. Compared with the existing centrifugal fan with corrosion resistance, the corrosion-resistant centrifugal fan is mainly different in that the corrosion-resistant centrifugal fan further comprises the corrosion-resistant sleeve 9, the corrosion-resistant sleeve 9 is tightly sleeved on the spindle 6 and is positioned on the shaft section in the cavity of the main machine shell 4, and the corrosion-resistant sleeve 9 is of a detachable structure. The inner end of the anti-corrosion sleeve 9 is abutted against the rear end face of the hub of the impeller 5, and the outer end of the anti-corrosion sleeve 9 protrudes out of the main shaft mounting hole of the main machine shell 4.

By detachably mounting the anti-corrosion sleeve 9 on the main shaft 6, the anti-corrosion sleeve 9 isolates the surface of the main shaft 6 from the conveyed corrosive gas medium, and plays a role in protecting the main shaft 6. Even if the corrosion damage occurs to the anti-corrosion sleeve 9, the anti-corrosion sleeve can be replaced and repaired during maintenance, so that the damage to the main shaft 6 is avoided, and the service life of equipment is prolonged. The corrosion-resistant centrifugal fan can obviously improve the corrosion resistance of the shaft section of the working end of the main shaft and prolong the service life of equipment.

In one embodiment of the present utility model, as shown in fig. 3 and 4, the impeller 5 is mounted to the working end of the main shaft 6 by means of a detachable stainless steel hub 8, using a mounting means of a positioning table and flange bolts. The hub 8 is mounted to the spindle 6 by means of a flat key 12 and the ends are axially locked by means of end stops 13 of stainless steel. The impeller 5 is made of a common carbon steel material and is coated with a polypropylene coating on the whole surface.

Specifically, as shown in fig. 4, a blocking edge 801 in a ring shape is arranged on the rear end face of the hub 8, and the blocking edge 801 is sleeved on the inner end head of the anti-corrosion sleeve 9.

Specifically, as shown in fig. 4, a locking pin 16 is arranged between the rear end face of the hub 8 and the front end face of the anti-corrosion sleeve 9, the locking pin 16 is specifically a cylindrical pin, and a plurality of locking pins 16 are uniformly distributed circumferentially. The hub 8 is provided with a plurality of mounting holes on the rear end face thereof, into which the locking pins 16 are interference-fitted.

The impeller 5 and the hub 8 are detachably connected, the hub 8 is made of stainless steel material alone, the impeller 5 is made of carbon steel material, the material cost can be reduced, and the processing and the forming are convenient; the blocking edge 801 is arranged on the rear end face of the hub 8, so that a pressure joint between the hub 8 and the anti-corrosion sleeve 9 can be shielded and protected, and the condition that the surface of the main shaft 6 is contacted with corrosive gas medium is reduced. By providing the locking pin 16, the anti-corrosion sleeve 9 can be prevented from rotating relative to the main shaft 6, so that synchronous operation of the anti-corrosion sleeve and the main shaft is ensured.

In one embodiment of the present utility model, as shown in fig. 3 and 4, the anti-corrosion sleeve 9 is made of polytetrafluoroethylene material.

Specifically, as shown in fig. 4, the corrosion-resistant centrifugal fan further comprises a sealing cover 10, the sealing cover 10 is connected to the outer side of the main shaft mounting hole of the main machine shell 4 through flange bolts, a lip-shaped sealing ring 15 is arranged in the middle hole of the sealing cover 10, and the lip-shaped sealing ring 15 seals a gap between the outer wall of the corrosion-resistant sleeve 9 and the main shaft mounting hole. The lip seal 15 is made of a fluorine rubber material which is corrosion-resistant and aging-resistant.

Specifically, as shown in fig. 4, the anti-corrosive sleeve 9 is provided with a wear ring 901 at a position contacting the lip seal 15. The wear-resistant ring 901 is a steel sleeve subjected to tempering heat treatment, the finish degree of the outer wall of the wear-resistant ring 901 is not lower than Ra0.8, and the wear-resistant ring 901 is compounded on the outer wall of the anti-corrosion sleeve 9.

The anticorrosive sleeve 9 is manufactured by selecting the polytetrafluoroethylene material, so that the anticorrosive sleeve has a good corrosion-resistant effect; by providing the wear ring 901 to cooperate with the lip seal 15 of the seal cap 10, a good sealing effect can be obtained.

In one embodiment of the present utility model, as shown in fig. 3 and 4, an O-ring 14 for sealing is provided between the sealing cover 10 and the outer wall of the main housing 4.

By providing the O-ring 14, the gap between the sealing cover 10 and the outer wall of the main housing 4 with corrosive gas medium can be reduced.

In one embodiment of the utility model, as shown in fig. 3 and 4, the end flaps 13 are pressed onto the end face of the spindle 6 by means of end seals 11. The end sealing pad 11 adopts a galvanized gasket or an outer PE coating gasket.

Through the arrangement of the end sealing pad 11, the end face of the main shaft 6 can be effectively protected, and the end face of the main shaft 6 is prevented from contacting the end face of the main shaft 6.

The utility model relates to a corrosion-resistant centrifugal fan working principle: in the operation process, the motor 2 drives the belt pulley 7 to rotate through belt transmission, the belt pulley 7 drives the main shaft 6 to rotate, the main shaft 6 transmits torque and rotating speed to the impeller 5, the impeller 5 centrifugally blows in the volute of the main machine shell 4, and corrosive gas media in a pipeline are continuously conveyed from the air inlet 401 to the air outlet. In the process that corrosive gas medium flows in the volute of the main machine shell 4, the surfaces contacted with the corrosive gas medium, the inner wall of the main machine shell 4 and the surface of the impeller 5 are coated with PP coatings, and the hub 8 is made of stainless steel, so that corrosion is not easy to occur. In the cavity inner shaft section of the main shaft 6, the anti-corrosion sleeve 9 performs closed protection on the exposed cantilever shaft section, so that the possibility that corrosive gas medium contacts the carbon steel main shaft 6 is reduced. Meanwhile, the anti-corrosion sleeve 9 and the sealing cover 10 are sealed through the lip-shaped sealing ring 15, so that leakage of corrosive gas media can be effectively reduced.

According to the corrosion-resistant centrifugal fan, the corrosion-resistant sleeve 9 is detachably arranged on the main shaft 6, and the corrosion-resistant sleeve 9 isolates the surface of the main shaft 6 and a conveyed corrosive gas medium, so that the main shaft 6 is protected. Even if the corrosion damage occurs to the anti-corrosion sleeve 9, the anti-corrosion sleeve can be replaced and repaired during maintenance, so that the damage to the main shaft 6 is avoided, and the service life of equipment is prolonged. The corrosion-resistant centrifugal fan can obviously improve the corrosion resistance of the shaft section of the working end of the main shaft and prolong the service life of equipment. In addition, through the detachable connection of the impeller 5 and the hub 8, the hub 8 is made of stainless steel material independently, and the impeller 5 is made of carbon steel material, so that the material cost can be reduced, and the processing and the forming are convenient; the blocking edge 801 is arranged on the rear end face of the hub 8, so that a pressure joint between the hub 8 and the anti-corrosion sleeve 9 can be shielded and protected, and the condition that the surface of the main shaft 6 is contacted with corrosive gas medium is reduced. By providing the locking pin 16, the anti-corrosion sleeve 9 can be prevented from rotating relative to the main shaft 6, so that synchronous operation of the anti-corrosion sleeve and the main shaft is ensured. The anticorrosive sleeve 9 is manufactured by selecting the polytetrafluoroethylene material, so that the anticorrosive sleeve has a good corrosion-resistant effect; by providing the wear ring 901 to cooperate with the lip seal 15 of the seal cap 10, a good sealing effect can be obtained. By providing the O-ring 14, the gap between the sealing cover 10 and the outer wall of the main housing 4 with corrosive gas medium can be reduced. Through the arrangement of the end sealing pad 11, the end face of the main shaft 6 can be effectively protected, and the end face of the main shaft 6 is prevented from contacting the end face of the main shaft 6.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims

1. The utility model provides a corrosion-resistant centrifugal fan, includes frame (1), motor (2), bearing box (3), main casing (4), impeller (5) and main shaft (6), its characterized in that still includes anticorrosive sleeve pipe (9), anticorrosive sleeve pipe (9) closely cup joints on main shaft (6) and be located on the axial section in main casing (4) cavity, the inner butt of anticorrosive sleeve pipe (9) is in impeller (5) wheel hub rear end face, anticorrosive sleeve pipe (9) outer end is visited out the main shaft mounting hole of main casing (4).

2. The corrosion-resistant centrifugal fan of claim 1, wherein: the impeller (5) is mounted to the working end of the main shaft (6) through a detachable stainless steel hub (8), the hub (8) is mounted on the main shaft (6) through a flat key (12), and the end part of the hub is axially locked through a stainless steel end baffle (13).

3. The corrosion-resistant centrifugal fan of claim 2, wherein: the rear end face of the hub (8) is provided with a blocking edge (801), and the blocking edge (801) is sleeved on the inner end head of the anti-corrosion sleeve (9).

4. A corrosion-resistant centrifugal fan according to claim 3, wherein: locking pins (16) are arranged between the rear end face of the hub (8) and the front end face of the anti-corrosion sleeve (9), the locking pins (16) are cylindrical pins, and a plurality of locking pins (16) are uniformly distributed on the circumference.

5. The corrosion-resistant centrifugal fan of claim 1, wherein: the anti-corrosion sleeve (9) is specifically made of polytetrafluoroethylene materials.

6. The corrosion-resistant centrifugal fan of claim 5, wherein: the anti-corrosion device is characterized by further comprising a sealing cover (10), wherein the sealing cover (10) is connected to the outer side of a main shaft mounting hole of the main machine shell (4) through flange bolts, a lip-shaped sealing ring (15) is arranged in a middle hole of the sealing cover (10), and the lip-shaped sealing ring (15) seals a gap between the outer wall of the anti-corrosion sleeve (9) and the main shaft mounting hole.

7. The corrosion-resistant centrifugal fan of claim 6, wherein: the anti-corrosion sleeve (9) is provided with a wear-resistant ring (901) at a contact position with the lip-shaped sealing ring (15).

8. The corrosion-resistant centrifugal fan of claim 6, wherein: an O-shaped ring (14) for sealing is arranged between the sealing cover (10) and the outer wall of the main machine shell (4).

9. The corrosion-resistant centrifugal fan of claim 2, wherein: the end baffle (13) is pressed onto the end face of the main shaft (6) through an end sealing gasket (11).