CN220748604U - Leakage-proof centrifugal fan - Google Patents

Abstract

The utility model discloses a leakage-proof centrifugal fan, which comprises a casing, a motor and an impeller, wherein the motor is arranged on one side of the casing, a motor shaft of the motor penetrates through the casing and then is arranged with the impeller, the impeller is arranged in a centrifugal cavity of the casing, an air inlet is formed in the other side of the casing, an air outlet is formed in the upper part of the casing, annular plates are respectively fixed on the front wall and the rear wall of the centrifugal cavity, sealing plates are respectively fixed on the outer walls of the two ends of the impeller, the annular plates and the sealing plates are coaxially arranged with the motor shaft, and a first sealing ring is arranged between the annular plates and the corresponding sealing plates. The leakage-proof centrifugal fan can effectively prevent gas from flowing out of a gap between the shell and the impeller, avoid the gas from generating channeling and ensure the exhaust efficiency.

Description

Leakage-proof centrifugal fan

Technical Field

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

Background

Most of the boiler blowers, material conveying blowers, sewage treatment blowers and the like adopt centrifugal blowers. Because radial runout and axial displacement exist when the centrifugal fan impeller rotates, gaps are needed to be reserved between the impeller and the shell, and air at the air inlet can directly enter the air duct without acceleration of the impeller or return to the air inlet from a gap after acceleration and pressurization of the impeller, so that the circulation of the air can be disturbed.

In the prior art, as disclosed in patent CN216894957U, this includes the shell, one side of the shell has air inlet, another side of the shell is fixed with the impeller structure, there is air outlet on the shell, the gas is discharged from the air outlet after entering the shell from the air inlet through the impeller acceleration, the impeller structure includes the impeller, there is motor driving the impeller on the shell, the end of the impeller has leak-proof plates, the air inlet is fixed with the leak-proof structure, the leak-proof structure includes the mounting plate, there are leak-proof rings in the mounting plate, there are connecting plates connected with leak-proof rings in the mounting plate, there are multiple connecting rods stretching out on the connecting plate, detachable connection has filter screens on the mounting plate, there are adjusting rings on the filter screen; the utility model has smart structure, the anti-leakage structure can generate corresponding displacement along with the movement of the impeller, no air flow passes between the impeller and the shell, the generation of channeling of air is avoided, and the exhaust efficiency is ensured.

However, in the centrifugal fan in the above patent, only the leakage prevention measure is performed on the centrifugal fan from the air inlet, but the leakage prevention measure is not performed on the gap between the motor and the housing, so that the gas may still leak from the gap between the motor and the housing, and a certain amount of gas may generate a cross flow.

Accordingly, there is a need to develop a leakage-proof centrifugal fan that addresses the above-described drawbacks.

Disclosure of Invention

The utility model aims to provide a leakage-proof centrifugal fan, which can effectively prevent gas from flowing out of a gap between a shell and an impeller, avoid the generation of channeling of the gas and ensure the exhaust efficiency.

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

the utility model discloses a leakage-proof centrifugal fan, which comprises a casing, a motor and an impeller, wherein the motor is arranged on one side of the casing, a motor shaft of the motor penetrates through the casing and then is arranged with the impeller, the impeller is arranged in a centrifugal cavity of the casing, an air inlet is formed in the other side of the casing, an air outlet is formed in the upper part of the casing, annular plates are respectively fixed on the front wall and the rear wall of the centrifugal cavity, sealing plates are respectively fixed on the outer walls of the two ends of the impeller, the annular plates and the sealing plates are coaxially arranged with the motor shaft, and a first sealing ring is arranged between the annular plates and the corresponding sealing plates.

Further, the impeller comprises impeller blades, an impeller front plate and an impeller rear plate, a plurality of impeller blades are regularly arranged between the impeller front plate and the impeller rear plate, and the outer sides of the impeller front plate and the impeller rear plate are fixedly connected with the sealing plate.

Further, an air outlet guide plate is fixed between the outer side of the annular plate and the inner wall of the same side of the centrifugal cavity, the air outlet guide plate is in a horn shape, and the small opening end of the air outlet guide plate faces the impeller.

Further, annular grooves which are matched with the sealing plates are formed in the front wall and the rear wall of the centrifugal cavity, and the outer edges of the sealing plates extend into the annular grooves and do not contact the surfaces of the annular grooves.

Further, a plurality of support ribs uniformly distributed on the circumference are arranged between the impeller front plate and the sealing plate and between the impeller rear plate and the sealing plate.

Further, an air inlet guide plate is fixedly arranged on the outer side of the air inlet, and the air inlet guide plate is in a horn shape with a large opening end facing the outer side.

Further, the air inlet guide plate comprises a filter screen, and the filter screen is detachably arranged on the outer side end face of the air inlet guide plate.

Further, the number of the first sealing rings is more than two, and the first sealing rings are felt sealing rings specifically.

Further, second sealing rings are arranged at the positions of the motor shaft and the shaft hole of the shell, which penetrates through the motor shaft, and the number of the second sealing rings is more than two.

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

according to the leakage-proof centrifugal fan, the annular plates are respectively arranged on the front wall and the rear wall of the centrifugal cavity, the first sealing rings are arranged on the inner walls of the annular plates, the inner edges of the first sealing rings are in contact with the sealing plates at the two ends of the impeller, gaps between the end faces of the impeller and the side walls of the centrifugal cavity are sealed, airflow mess is reduced, and exhaust efficiency is guaranteed. Meanwhile, the strength of the end wall plate of the centrifugal cavity can be obviously improved due to the arrangement of the annular plate, and the bulge deformation condition is avoided.

In addition, through all set up the support rib between impeller front bezel and closing plate, between impeller back bezel and the closing plate, can guarantee the circularity and the stability of closing plate, avoid taking place to warp. Through the setting of air-out guide plate, can carry out auxiliary stay to the annular plate on the one hand, reduce its risk that takes place to warp, on the other hand can protect the dead angle behind the annular plate back, the direction is aired exhaust, avoids here to produce the vortex and influences normal exhaust. Through the arrangement of the annular groove, the wind resistance of the gap shifting wind flow can be increased, the shifting wind resistance is further increased, and the running condition of the fan is improved. Through set up the second sealing washer in the shaft hole department of motor shaft and the casing of passing, can prevent here gas leakage to the casing outside, further improved centrifugal fan's leak protection ability.

Drawings

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

FIG. 1 is a schematic diagram of a cross-sectional front view of a leak-proof centrifugal fan of the present utility model;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1A;

fig. 3 is a schematic perspective view of the leakage-proof centrifugal fan in a state of not installing a filter screen.

Reference numerals illustrate: 1. a housing; 101. a centrifugal chamber; 2. a motor; 3. an impeller; 301. impeller blades; 302. an impeller front plate; 303. an impeller back plate; 4. an air inlet; 5. an air outlet; 6. an annular plate; 7. a sealing plate; 8. an air outlet guide plate; 9. an annular groove; 10. support ribs; 11. a filter screen; 12. a first seal ring; 13. a second seal ring; 14. an air inlet guide plate.

Detailed Description

The utility model aims to provide a leakage-proof centrifugal fan, which can effectively prevent gas from flowing out of a gap between a shell and an impeller, avoid the generation of channeling of the gas and ensure the exhaust efficiency.

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 diagram of a cross-sectional front view of a leakage-preventing centrifugal fan according to the present utility model; FIG. 2 is an enlarged schematic view of the structure of FIG. 1A; fig. 3 is a schematic perspective view of the leakage-proof centrifugal fan in a state of not installing a filter screen.

In one embodiment, as shown in fig. 1 and 2, a leakage-proof centrifugal fan comprises a casing 1, a motor 2 and an impeller 3, wherein the motor 2 is installed on one side of the casing 1, and a motor shaft 201 of the motor 2 is coaxially installed with the impeller 3 after passing through the casing 1, and torque is transmitted by using a common flat key. The impeller 3 is arranged in the centrifugal cavity 101 of the casing 1, the other side of the casing 1, which is away from the motor 2, is provided with an air inlet 4, and the upper part of the casing 1 is provided with an air outlet 5. Annular plates 6 are welded on the front wall and the rear wall in the centrifugal cavity 101 respectively, and sealing plates 7 are fixed on the outer walls of the two ends of the impeller 3 respectively. The annular plate 6 and the sealing plate 7 are arranged continuously in a whole circle and are arranged coaxially with the motor shaft 201, a first sealing ring 12 is arranged between the annular plate 6 and the corresponding sealing plate 7, and a mounting groove of the first sealing ring 12 is formed in the inner wall of the annular plate 6.

Through set up annular plate 6 respectively on centrifugal chamber 101 front and back wall, annular plate 6 inner wall installs first sealing washer 12, and the inner edge of first sealing washer 12 contacts the closing plate 7 at impeller 3 both ends, seals the clearance between impeller 3 terminal surface and centrifugal chamber 101 lateral wall, has reduced the air current disorder and has scurry, guarantees exhaust efficiency. Meanwhile, the strength of the end wall plate of the centrifugal cavity 101 can be obviously improved through the arrangement of the annular plate 6, and the bulge deformation condition is avoided.

In a specific embodiment of the present utility model, as shown in fig. 1 and 3, the impeller 3 includes impeller blades 301, an impeller front plate 302 and an impeller rear plate 303, the impeller rear plate 303 is an arc-shaped plate, and a plurality of impeller blades 301 are regularly arranged between the impeller front plate 302 and the impeller rear plate 303, and sealing plates 7 are welded on the outer sides of the impeller front plate 302 and the impeller rear plate 303.

Specifically, as shown in fig. 2, a plurality of support ribs 10 uniformly distributed circumferentially are provided between the impeller front plate 302 and the seal plate 7, and between the impeller rear plate 303 and the seal plate 7. The support ribs 10 can be supported by using reinforcing ribs or triangular rib plates.

By providing the support ribs 10 between the impeller front plate 302 and the seal plate 7 and between the impeller rear plate 303 and the seal plate 7, the roundness and stability of the seal plate 7 can be ensured, and deformation can be avoided.

In a specific embodiment of the present utility model, as shown in fig. 2, an air-out guide plate 8 is obliquely installed between the outer side of the annular plate 6 and the inner wall of the same side of the centrifugal cavity 101, the air-out guide plate 8 is in a horn shape, and the small opening end of the air-out guide plate 8 faces the impeller 3.

Through the setting of air-out guide plate 8, can carry out auxiliary stay to annular slab 6 on the one hand, reduce its risk that takes place to warp, on the other hand can protect the dead angle behind annular slab 6 back, the direction is aired exhaust, avoids here to produce the vortex and influences normal airing exhaust.

In one embodiment of the present utility model, as shown in fig. 2, annular grooves 9 corresponding to the sealing plates 7 are formed on the front and rear walls of the centrifugal chamber 101, and the outer edges of the sealing plates 7 extend into the annular grooves 9 and do not contact the surfaces of the annular grooves 9.

Through the arrangement of the annular groove 9, the windage of the clearance shifting wind flow can be increased, the shifting windage is further increased, and the running condition of the fan is improved.

In a specific embodiment of the present utility model, as shown in fig. 1 and 3, an air inlet guide plate 14 is fixedly installed at the outer side of the air inlet 4, the air inlet guide plate 14 is in a horn shape with a large opening end facing to the outer side, and the inner end of the air inlet guide plate 14 is directly welded at the outer side of the end wall of the centrifugal cavity 101 or is installed by adopting flange plate bolting.

Specifically, as shown in fig. 1, the air conditioner further includes a filter screen 11, wherein the filter screen 11 is a wire mesh, and the filter screen 11 is detachably mounted on the outer side of the air inlet guide plate 14. The filter screen 11 is an optional component, and may be installed according to actual conditions, or may be omitted when the gas impurity is small.

In one embodiment of the present utility model, as shown in fig. 1 and 2, the number of single-sided first seal rings 12 is more than two, and the first seal rings 12 are felt seal rings which have small friction resistance and allow the sealing plate 7 to be used under large circle runout.

In a specific embodiment of the present utility model, as shown in fig. 1, a second sealing ring 13 is disposed at the shaft hole of the motor shaft 201 and the penetrating housing 1, the second sealing ring 13 is a lip-shaped sealing ring or an O-shaped sealing ring, and the number of the second sealing rings 13 is more than two.

By providing the second seal ring 13 at the shaft hole of the motor shaft 201 and the passing casing 1, air leakage to the outside of the casing 1 can be prevented, and the leakage preventing performance of the centrifugal fan can be further improved.

According to the working principle of the leakage-proof centrifugal fan, after the motor 2 is started, the motor 2 drives the impeller 3 to rotate, impeller blades 301 are used for centrifugal blast, gas is guided by the air inlet guide plate 14 and then enters the centrifugal cavity 101 through the air inlet 4, and after the gas is accelerated by the impeller 3, the air guide plate 8 is matched with the volute for guiding, and then the gas is discharged through the air outlet 4. In the gap between the side wall of the casing 1 and the end face of the impeller 3, the gas after pressurization and acceleration is prevented from backward and inward reverse movement due to the blocking of the first sealing ring 12, and if a small amount of gas passes through the first sealing ring 12, the gas is blocked by the second sealing ring 13, so that the gas is difficult to leak outwards.

According to the leakage-proof centrifugal fan, the annular plates 6 are respectively arranged on the front wall and the rear wall of the centrifugal cavity 101, the first sealing rings 12 are arranged on the inner walls of the annular plates 6, the inner edges of the first sealing rings 12 are in contact with the sealing plates 7 at the two ends of the impeller 3, gaps between the end faces of the impeller 3 and the side walls of the centrifugal cavity 101 are sealed, airflow turbulence is reduced, and exhaust efficiency is guaranteed. Meanwhile, the strength of the end wall plate of the centrifugal cavity 101 can be obviously improved through the arrangement of the annular plate 6, and the bulge deformation condition is avoided. In addition, by providing the support ribs 10 between the impeller front plate 302 and the seal plate 7 and between the impeller rear plate 303 and the seal plate 7, the roundness and stability of the seal plate 7 can be ensured, and deformation can be avoided. Through the setting of air-out guide plate 8, can carry out auxiliary stay to annular slab 6 on the one hand, reduce its risk that takes place to warp, on the other hand can protect the dead angle behind annular slab 6 back, the direction is aired exhaust, avoids here to produce the vortex and influences normal airing exhaust. Through the arrangement of the annular groove 9, the windage of the clearance shifting wind flow can be increased, the shifting windage is further increased, and the running condition of the fan is improved. By providing the second seal ring 13 at the shaft hole of the motor shaft 201 and the passing casing 1, air leakage to the outside of the casing 1 can be prevented, and the leakage preventing performance of the centrifugal fan can be further improved.

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 (9)

1. The utility model provides a leak protection centrifugal fan, includes casing (1), motor (2) and impeller (3), motor (2) are installed one side of casing (1) just motor shaft (201) of motor (2) pass behind casing (1) with impeller (3) are installed, impeller (3) set up in centrifugal chamber (101) of casing (1), air intake (4) have been seted up to the opposite side of casing (1), air outlet (5) have been seted up on the upper portion of casing (1), a serial communication port, be fixed with annular slab (6) respectively on the front and back wall in centrifugal chamber (101), be fixed with closing plate (7) on the outer wall of both ends of impeller (3) respectively, annular slab (6) with closing plate (7) all with motor shaft (201) coaxial setting, annular slab (6) and corresponding install first sealing washer (12) between closing plate (7).

2. The leakage-proof centrifugal fan according to claim 1, wherein: impeller (3) are including impeller blade (301), impeller front bezel (302) and impeller back bezel (303), and a plurality of impeller blade (301) rule are arranged impeller front bezel (302) with between impeller back bezel (303), impeller front bezel (302) with the outside fixed connection of impeller back bezel (303) closing plate (7).

3. The leakage-proof centrifugal fan according to claim 1, wherein: an air outlet guide plate (8) is fixed between the outer side of the annular plate (6) and the inner wall of the same side of the centrifugal cavity (101), and the air outlet guide plate (8) is in a horn shape and the small opening end of the air outlet guide plate (8) faces the impeller (3).

4. The leakage-proof centrifugal fan according to claim 1, wherein: annular grooves (9) which are matched with the sealing plates (7) are formed in the front wall and the rear wall of the centrifugal cavity (101), and the outer edges of the sealing plates (7) extend into the annular grooves (9) and do not contact the surfaces of the annular grooves (9).

5. The leakage-proof centrifugal fan according to claim 2, wherein: a plurality of support ribs (10) uniformly distributed on the circumference are arranged between the impeller front plate (302) and the sealing plate (7) and between the impeller rear plate (303) and the sealing plate (7).

6. The leakage-proof centrifugal fan according to claim 1, wherein: an air inlet guide plate (14) is fixedly arranged on the outer side of the air inlet (4), and the air inlet guide plate (14) is in a horn shape with the large opening end facing the outer side.

7. The leakage-proof centrifugal fan according to claim 6, wherein: the air inlet guide plate is characterized by further comprising a filter screen (11), wherein the filter screen (11) is detachably arranged on the outer side end face of the air inlet guide plate (14).

8. The leakage-proof centrifugal fan according to claim 1, wherein: the number of the first sealing rings (12) is more than two, and the first sealing rings (12) are felt sealing rings.

9. The leakage preventing centrifugal fan according to any one of claims 1 to 8, wherein: the motor shaft (201) and the shaft hole of the penetrating machine shell (1) are provided with second sealing rings (13), and the number of the second sealing rings (13) is more than two.