CN201225338Y

CN201225338Y - Centrifugal blower

Info

Publication number: CN201225338Y
Application number: CNU200820113207XU
Authority: CN
Inventors: 夏亦秋; 夏亦清
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-16
Filing date: 2008-07-16
Publication date: 2009-04-22
Anticipated expiration: 2018-07-16

Abstract

The utility model discloses a centrifugal fan which comprises a motor, a housing, and an impeller that is positioned in the housing and is provided with vanes, wherein the impeller is also provided with a connecting shaft coaxially connected with a motor shaft by a rotating way. The centrifugal fan also comprises a leaked gas reflux apparatus arranged at the gap between the connecting shaft and the housing, one side part of the leaked gas reflux apparatus is connected with the housing by a sealing way, thereby gas leaked from the gap can enter into the leaked gas reflux apparatus, and the other side part of the leaked gas reflux apparatus is provided with an outlet communicated with an inlet of the centrifugal fan, thereby leaked gas can flow back to the fan from the outlet again. The centrifugal fan can effectively prevent transported aggressive gas from leaking into the environment.

Description

A kind of centrifugal blower

Technical field

The utility model belongs to the ventilation equipment field, particularly relates to the centrifugal blower of corrosive gass such as a kind of acid that is used to carry fields such as chemical industry, pharmacy, plating, electronics, environmental protection, alkali.

Background technique

Centrifugal blower is applied in a lot of occasions, when carrying corrosive gas as fields such as chemical industry, pharmacy, plating, needs centrifugal blower to have advantages of good anticorrosion performance especially.In general, the working principle of blower fan when carrying etchant gas is front intake grill air intake, above or the side air-out, can produce very big interior pressure because impeller is on-stream, at gas when exhaust outlet goes out to export, have certain gas from the coupling shaft of impeller and the gap between the casing seepage backward, the gas of seepage inevitably can cause the corrosion of motor and iron frame, simultaneously, the gas that spills also can bring pollution to environment, brings harm to human body.Therefore, needing badly provides a kind of centrifugal blower, and it can effectively solve the leakage problem of described gas.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of centrifugal blower, and its gas permeation that can effectively prevent to carry is in environment.

For solving above technical problem, the utility model is taked following technological scheme:

A kind of centrifugal blower, comprise motor, casing, be positioned at the impeller that casing has blade, impeller also has the coupling shaft that the arbor same axis with motor is rotationally connected, described centrifugal blower also comprises the seepage gas reflux apparatus of the gap location that is arranged between coupling shaft and the casing, thereby a sidepiece of seepage gas reflux apparatus is tightly connected mutually with coupling shaft and casing and can enters wherein from the gas of gap location seepage, the other side of seepage gas reflux apparatus has the outlet that communicates with the ingress of centrifugal blower, thereby the gas of seepage can flow back into the blower fan again from this outlet.

Described seepage gas reflux apparatus comprises that stuffing box gland is located at first working of plastics and second working of plastics on the coupling shaft rearward end, constitute a secret room between the part outer surface of first working of plastics, second working of plastics, coupling shaft and the part outer surface of casing, the seepage gas reflux apparatus also comprises the gas channel that the gas of the confession seepage that two end part are connected with secret room, outlet respectively passes through.

Described gas channel is a vacuum tube, and the oral area of one end is tightly connected mutually with second working of plastics.

First working of plastics is provided with first screw thread, second working of plastics is provided with second screw thread, described first screw thread, second screw thread are oppositely arranged, and are formed with the microchannel of crossing for the gas stream of seepage between them, and this microchannel constitutes the part of secret room.

Because the enforcement of above technological scheme, the relative prior art of the utility model has following advantage:

The gap location that may cause gas permeation between casing and impeller is provided with the seepage gas reflux apparatus, one sidepiece of seepage gas reflux apparatus is tightly connected mutually with coupling shaft and casing, the other side has the outlet that communicates with the ingress of centrifugal blower, when blower fan turns round, because the effect of blower fan suction, produce vacuum in the seepage gas reflux apparatus, the gas of seepage is inhaled in the seepage gas reflux apparatus, and further flow out from the outlet of seepage gas reflux apparatus, because the outlet of seepage gas reflux apparatus communicates with the inlet of centrifugal blower, thereby the corrosive gas of seepage comes back in the blower fan, so, can prevent effectively that the corrosive gas of carrying from leaking in the environment.

Description of drawings

The utility model is described in more detail below in conjunction with the drawings and specific embodiments:

Fig. 1 looks schematic representation for master of the present utility model;

Fig. 2 is the enlarged diagram of analysing and observe of impeller of the present utility model;

Fig. 3 is the cross-sectional schematic of first working of plastics of the present utility model and second working of plastics;

Fig. 4 is the cross-sectional schematic after first working of plastics of the present utility model and second working of plastics intersect

Wherein: 1, motor; 2, casing; 3, impeller; 30, shroud; 31, blade; 32, hub disk; 33, coupling shaft; 4, seepage gas reflux apparatus; 40, outlet; 41, first working of plastics; 410, first screw thread; 42, second working of plastics; 420, second screw thread; 43, gas channel; 5, secret room; 6, microchannel; 7, plastic protective coating.

Embodiment

As shown in Figure 1, the centrifugal blower according to present embodiment mainly comprises motor 1, casing 2, places impeller 3, seepage gas reflux apparatus 4 in the casing 2.

As shown in Figure 2, above-mentioned impeller 3 comprises shroud 30, blade 31, coupling shaft 33 and hub disk 32, they are made by steel plate, and fix formation impeller 3 integral body by welding or riveted joint each other, because using steel plate makes, the intensity of impeller 3 is protected, and is not yielding, thereby balance is better.Simultaneously, in order to guarantee that steel plate 3 is difficult for being corroded property gas and corrodes, scribble one deck plastic protective coating 7 at the outer surface top roll of impeller 3.

As Fig. 1, shown in Figure 3, seepage gas reflux apparatus 4 is arranged on the gap location between coupling shaft 33 and the casing 2, and it mainly comprises first working of plastics 41 with first screw thread 410, second working of plastics 42, the gas channel 43 with second screw thread 420.First working of plastics 41, second working of plastics, 42 equal stuffing box glands are located on the rear portion of coupling shaft 33, and first working of plastics 41, second working of plastics 42 also are tightly connected with casing 2 respectively mutually, so, constitute a secret room 5 between the outer surface at the rear portion of first working of plastics 41, second working of plastics 42, coupling shaft 33, the part outer surface of casing 2, after corrosive gas leaks out from gap location, will enter secret room 5 and can not be discharged in the environment.Enter gas behind the secret room 5 further flow to seepage gas reflux apparatus 4 by gas channel 43 outlet 40 places, and flow out and enter the blower fan, thereby finish the backflow of seepage gas from exporting 40.

As shown in Figure 4, first screw thread 410, second screw thread 420 are oppositely arranged, and intersect the microchannel 6 of the gas communication that formation can enter for seepage between them.

Above-mentioned gas passage 43 is a vacuum tube that is communicated with outlet 40 and secret room 5, and the oral area of one end is connected with second working of plastics 42.

To sum up, centrifugal blower of the present utility model produces vacuum in the seepage gas reflux apparatus in the running, will suck wherein from the etchant gas of the outside seepage in gap of coupling shaft, and further get back to the blower fan from gas channel, prevent that the etchant gas of seepage is leaked in the environment.On first working of plastics that constitutes the seepage gas reflux apparatus and second working of plastics, crossing worm structure is set, can plays buffer gas pressure backward, gas is flowed in microchannel after vacuum tube sucks air inlet.

Claims

1, a kind of centrifugal blower, comprise motor (1), casing (2), be positioned at the impeller (3) that described casing (2) has blade (31), described impeller (3) also has the coupling shaft (33) that arbor (10) same axis with described motor (1) is rotationally connected, it is characterized in that: described centrifugal blower also comprises the seepage gas reflux apparatus (4) that is arranged on the gap location between described coupling shaft (33) and the described casing (2), one sidepiece of described seepage gas reflux apparatus (4) and described coupling shaft (33) and described casing (2) thereby be tightly connected mutually can enter wherein from the gas of gap location seepage, the other side of described seepage gas reflux apparatus (4) has the outlet (40) that communicates with the ingress of centrifugal blower, flows back into the blower fan again thereby the gas of seepage can export (40) from this.

2, a kind of centrifugal blower according to claim 1, it is characterized in that: described seepage gas reflux apparatus (4) comprises that stuffing box gland is located at first working of plastics (41) and second working of plastics (42) on described coupling shaft (33) rearward end, described first working of plastics (41), second working of plastics (42), constitute a secret room (5) between the part outer surface of the part outer surface of coupling shaft (33) and casing (2), described seepage gas reflux apparatus (4) also comprise two end part respectively with described secret room (5), the gas channel (43) that the gas of the confession seepage that described outlet (40) is connected passes through.

3, a kind of centrifugal blower according to claim 2 is characterized in that: described gas channel (43) is a vacuum tube, and the oral area of one end is tightly connected mutually with described second working of plastics (42).

4, a kind of centrifugal blower according to claim 2, it is characterized in that: described first working of plastics (41) is provided with first screw thread (410), described second working of plastics (42) is provided with second screw thread (420), described first screw thread (410), described second screw thread (420) are oppositely arranged, and between them, being formed with the microchannel of crossing for the gas stream of seepage (6), described microchannel (6) constitutes the part of described secret room (5).