CN209976842U

CN209976842U - Negative pressure sealing device for centrifugal fan

Info

Publication number: CN209976842U
Application number: CN201920430715.9U
Authority: CN
Inventors: 沈虹
Original assignee: Jiangsu Heavy Fan Co Ltd
Current assignee: Jiangsu Heavy Fan Co Ltd
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2020-01-21
Anticipated expiration: 2029-04-01

Abstract

The utility model discloses a centrifugal fan negative pressure sealing device, which comprises a housing, the welding has the sleeve around the dwang on the right side wall of casing, the welding has first joint spare on the telescopic right-hand member face, it emits holes to have seted up gas leakage on the telescopic lower lateral wall, gas leakage inlet hole has been seted up on the lateral wall under the left end of casing, gas leakage is emitted and is connected through the trachea between the inlet hole. The welding of the right side portion of casing has the sleeve, the welding has the plectane on the dwang, through first joint spare between plectane and the sleeve, second joint spare and ring fastener are connected, can prevent effectively that gas from casing and bearing connection position from overflowing, and telescopic lateral wall is equipped with leaks gas and portal, the lateral wall is equipped with the gas leakage inlet hole under the left end of casing, leak gas and portal and leak gas and be connected through the trachea between the inlet hole, utilize the negative pressure of fan air inlet department to inhale back the gas of revealing, avoid gas from casing and bearing kneck to overflow, it leads to the surrounding environment contaminated to fill whole space.

Description

Negative pressure sealing device for centrifugal fan

Technical Field

The utility model belongs to the technical field of centrifugal fan device, concretely relates to centrifugal fan negative pressure sealing device.

Background

In the gas transportation industry, a centrifugal fan is a commonly used device, and the centrifugal fan is a machine which increases the gas pressure and discharges gas by means of input mechanical energy, and is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grains; wind tunnel wind source and air cushion boat inflation and propulsion. When the low-pressure centrifugal fans are operated in series or used for conveying dust-containing or powder materials, a large amount of dust-containing powder can fly out along the outer ring of the main shaft on the back of the impeller, the whole space is instantly diffused, and the environment is polluted.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centrifugal fan negative pressure sealing device to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a negative pressure sealing device of a centrifugal fan comprises a casing, wherein a bracket is welded on the left side inside the casing, bearings are fixedly arranged at the central position of the bracket and the central position of the right side wall of the casing, a rotating rod is rotatably arranged between the two bearings, impellers are uniformly welded on the rotating rod between the two bearings in the circumferential direction, an air inlet is formed in the left end of the casing, a circular plate vertical to the rotating rod is welded on the right end of the rotating rod, a circular ring clamping piece is welded on the edge part of the circular plate, a sleeve surrounding the rotating rod is welded on the right side wall of the casing, a first clamping piece is welded on the right end surface of the sleeve, a second clamping piece is fixedly connected on the right side of the first clamping piece through a bolt, and the circular ring clamping piece is matched with a clamping groove formed by the first clamping piece and the second clamping piece, an air leakage outlet hole is formed in the lower side wall of the sleeve, an air leakage inlet hole is formed in the lower side wall of the left end of the casing, and the air leakage outlet hole is connected with the air leakage inlet hole through an air pipe.

Preferably, the right end of the casing is fixedly provided with a motor, a rotating shaft of the motor is connected with the rotating rod through a coupler, and a protective cover is arranged outside the motor.

Preferably, rubber pads are bonded on the contact surfaces of the first clamping piece and the second clamping piece.

This setting can make and be connected inseparabler between first joint spare and the second joint spare, prevents gas leakage.

Preferably, the rear side surface of the casing is also provided with an air outlet, and the air outlet is perpendicular to the casing.

Preferably, a filter screen is fixedly installed on the air inlet.

This filter screen that sets up air intake department can filter the impurity of great particle diameter in the outside air, prevents inside the impurity of great particle diameter enters into the casing, influences the normal use of fan.

The utility model discloses a technological effect and advantage: the utility model discloses an, turn on the motor drive dwang and rotate, make the impeller rotate, air intake department produces the negative pressure and makes the air enter into the casing inner chamber, and discharge from the air outlet, air intake department fixed mounting has the filter screen, can block that the external great impurity from getting into the casing inside, the right side portion welding of casing has the sleeve, welding has the plectane on the dwang, be connected through first joint spare, second joint spare and ring fastener between plectane and the sleeve, can effectively prevent gas from the casing and bearing junction position escape, and the lateral wall of sleeve is equipped with the gas leakage exit, the lateral wall is equipped with the gas leakage inlet under the left end of casing, be connected through the trachea between gas leakage exit and the gas leakage inlet, can utilize the negative pressure of fan air intake department to inhale the gas that reveals back, avoid gas to escape from casing and bearing interface, it leads to the surrounding environment to, good anti-leakage effect, convenient use and low cost.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged schematic structural diagram of a point a in fig. 1 according to the present invention.

In the figure: 1 casing, 2 supports, 3 bearings, 4 dwang, 5 impellers, 6 air intakes, 7 plectanes, 8 ring fastener, 9 sleeves, 10 first joint spare, 11 second joint spare, 12 bolts, 13 gas leakage holes, 14 gas leakage inlet holes, 15 trachea, 16 motor, 17 protection casings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, a centrifugal fan negative pressure sealing device comprises a casing 1, a bracket 2 is welded on the left side inside the casing 1, bearings 3 are fixedly installed at the central position of the bracket 2 and the central position of the right side wall of the casing 1, two rotating rods 4 are rotatably installed between the bearings 3, impellers 5 are uniformly welded on the rotating rods 4 located between the two bearings 3 in the circumferential direction, an air inlet 6 is arranged at the left end of the casing 1, a circular plate 7 perpendicular to the rotating rods 4 is welded on the right end of the rotating rods 4, a circular ring clamping member 8 is welded on the edge of the circular plate 7, a sleeve 9 surrounding the rotating rods 4 is welded on the right side wall of the casing 1, a first clamping member 10 is welded on the right end surface of the sleeve 9, and a second clamping member 11 is fixedly connected on the right side of the first clamping member 10 through a bolt 12, the ring fastener 8 is matched with a clamping groove formed by a first clamping piece 10 and a second clamping piece 11, an air leakage outlet hole 13 is formed in the lower side wall of the sleeve 9, an air leakage inlet hole 14 is formed in the lower side wall of the left end of the casing 1, and the air leakage outlet hole 13 is connected with the air leakage inlet hole 14 through an air pipe 15.

Specifically, the right end of casing 1 still fixed mounting has motor 16, the axis of rotation of motor 16 is connected with dwang 4 through the shaft coupling, motor 16 is equipped with protection casing 17 outward.

Specifically, rubber pads are bonded on the contact surfaces of the first clamping piece 10 and the second clamping piece 11.

Specifically, the rear side surface of the machine shell 1 is also provided with an air outlet, and the air outlet is perpendicular to the machine shell 1.

Specifically, a filter screen is fixedly installed on the air inlet 6.

When the air purifier is used, the motor 16 is turned on to drive the rotating rod 4 to rotate, so that the impeller 5 rotates, negative pressure is generated at the air inlet 6 to enable air to enter an inner cavity of the machine shell 1 and be discharged from the air outlet, a filter screen is fixedly installed at the air inlet 6 to prevent external large impurities from entering the machine shell 1, the sleeve 9 is welded at the right side part of the machine shell 1, the circular plate 7 is welded on the rotating rod 4, the circular plate 7 is connected with the sleeve 9 through the first clamping piece 10, the second clamping piece 11 and the circular ring clamping piece 8, so that the air can be effectively prevented from escaping from the connecting part of the machine shell 1 and the bearing 3, the side wall of the sleeve 9 is provided with the air leakage outlet 13, the lower side wall of the left end of the machine shell 1 is provided with the air leakage inlet 14, the air leakage outlet 13 is connected with the air inlet 14 through the air pipe 15, the leaked air can be, the whole space is filled, so that the surrounding environment is polluted, the leakage prevention effect is good, the use is convenient, and the cost is low.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a centrifugal fan negative pressure sealing device, includes casing (1), its characterized in that: the inner left side of the casing (1) is welded with a support (2), the central position of the support (2) and the central position of the right side wall of the casing (1) are fixedly provided with bearings (3), two bearings (3) are rotatably provided with rotating rods (4), the rotating rods (4) between the two bearings (3) are circumferentially and uniformly welded with impellers (5), the left end of the casing (1) is provided with an air inlet (6), the right end of the rotating rod (4) is welded with a circular plate (7) which is vertical to the rotating rod (4), the edge part of the circular plate (7) is welded with a circular ring clamping piece (8), the right side wall of the casing (1) is welded with a sleeve (9) which surrounds the rotating rod (4), the right end surface of the sleeve (9) is welded with a first clamping piece (10), the right side of the first clamping piece (10) is fixedly connected with a second clamping piece (11) through a bolt (12), the ring fastener (8) and the draw-in groove phase-match that first joint spare (10) and second joint spare (11) are constituteed, it leaks gas and portal (13) to have seted up on the lower lateral wall of sleeve (9), it leaks gas and has seted up on the left end lower wall of casing (1) and has advanced hole (14) to leak gas, leak gas and portal (13) and leak gas and advance and be connected through trachea (15) between hole (14).

2. The centrifugal fan negative pressure sealing device of claim 1, wherein: the right-hand member of casing (1) still fixed mounting have motor (16), the axis of rotation of motor (16) is connected with dwang (4) through the shaft coupling, motor (16) are equipped with protection casing (17) outward.

3. The centrifugal fan negative pressure sealing device of claim 1, wherein: rubber pads are bonded on the contact surfaces of the first clamping piece (10) and the second clamping piece (11).

4. The centrifugal fan negative pressure sealing device of claim 1, wherein: the rear side surface of the machine shell (1) is also provided with an air outlet, and the air outlet is perpendicular to the machine shell (1).

5. The centrifugal fan negative pressure sealing device of claim 1, wherein: and a filter screen is fixedly arranged on the air inlet (6).