CN210196058U

CN210196058U - Leakage-proof centrifugal fan

Info

Publication number: CN210196058U
Application number: CN201921141874.3U
Authority: CN
Inventors: Lianhua Zhang; 张连华; Baijin Chen; 陈柏金; Hui Zhang; 张晖
Original assignee: In Department Of Poly Letter Clean Hot Forging Equipment Research And Development Ltd By Share Ltd
Current assignee: In Department Of Poly Letter Clean Hot Forging Equipment Research And Development Ltd By Share Ltd; Zhongke Juxin Clean Energy and Hot Forging Equipment Research and Development Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-03-27
Anticipated expiration: 2029-07-19

Abstract

The utility model relates to a prevent centrifugal fan that leaks. The leakage problem of the traditional centrifugal fan can not be thoroughly solved, and the leakage problem is mainly caused by small medium molecules and relative sealing between dynamic and static objects. The utility model discloses set up centrifugal fan both sides face and admit air, the air current is impressed exhaust duct along the pivot in opposite directions and after getting into centrifugal blade assembly, and sealing device only undertakes the sealed of the inside negative pressure of fan, and gas can not leak to fundamentally has solved the problem that centrifugal fan leaked. The utility model has the advantages of novel design, low energy consumption, no leakage and the like.

Description

Leakage-proof centrifugal fan

Technical Field

The utility model relates to a centrifugal fan especially relates to a centrifugal fan who follows two-way air intake of axial belongs to gas delivery pressure boost energy storage technical field.

Background

The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. Centrifugal fans are widely used in ventilation, dust extraction and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings. The centrifugal fan accelerates gas by using an impeller rotating at a high speed according to the principle that kinetic energy is converted into potential energy, and then decelerates and changes the flow direction so as to convert the kinetic energy into the potential energy (pressure). In a single stage centrifugal fan, the gas enters the impeller from an axial direction, changes to a radial direction as it flows through the impeller, and then enters the diffuser. In diffusers, the gas changes flow direction and slows the gas flow by increasing the cross-sectional area of the conduit, which slows down the flow, which converts kinetic energy into pressure energy. The traditional centrifugal fan generally adopts single-side air inlet and centrifugally changes direction through an impeller, and in the process that air flow moves forwards along the axial direction, part of air flow is pressed out of the fan through a rotating gap between a rotating shaft and a fan shell to form air leakage.

For this reason, various sealing measures have been taken, but none of them can be completely solved. The leakage is prevented by purely using a sealing means, and the problem cannot be completely solved. The centrifugal fan with the bidirectional air inlet is designed on the basis of a large amount of practices, and the problem of leakage of the centrifugal fan can be fundamentally solved.

Disclosure of Invention

To the problem that needs to solve among the background art, the utility model provides an anti-leakage centrifugal fan. The leakage problem of the centrifugal fan is solved by the arrangement of relative bidirectional air inlet.

In order to realize above-mentioned purpose the utility model provides a following technical scheme, a prevent centrifugal fan that leaks, it includes gas transmission path, power transmission system and centrifugation fan blade assembly, gas transmission path includes: the centrifugal fan blade assembly comprises a shell, an air inlet pipeline and an air outlet pipeline, wherein the air outlet pipeline is communicated with an inner cavity of the shell, and the centrifugal fan blade assembly is arranged in the shell; the power transmission system includes: pivot, motor, the pivot passes shell and centrifugal fan blade assembly, the pivot with be equipped with sealing device between the shell, the pivot with centrifugal fan blade assembly fixed connection, the motor drives the pivot rotates its characterized in that: the centrifugal fan blade assembly comprises: the radial plate is two annular sheets which are oppositely and parallelly arranged, the blades are fixedly connected and evenly distributed, the axial plane of each blade is parallel to the axis of the rotating shaft, one end of each support rod is fixedly connected with the radial plate, the other end of each support rod is fixedly connected with the corresponding shaft sleeve, and the shaft sleeves are fixedly arranged on the rotating shafts; the space between the spoke plate inner hole and the shaft sleeve forms an air inlet channel; the air inlet pipeline is respectively communicated with two ends of the air inlet channel; the motor passes through the pivot drives centrifugal fan blade assembly rotates, and gaseous under the centrifugal action warp inlet channel is discharged radials outer fringe with cavity between the shell is impressed in succession the pipeline of giving vent to anger, above-mentioned in-process be the negative pressure in the inlet channel, the gaseous flow in the two inlet channels is in opposite directions inlet channel.

Further, the number of the blades is at least three.

Further, the blade is a planar plate.

Further, the blade is in a shape of a curved plate.

Furthermore, the planar plate-shaped blades and the extension lines thereof on the radial plate are superposed with the secant lines at the position on the radial plate, and the secant lines corresponding to each blade are equal in length and smaller than the diameter of the radial plate.

Further, a tangent line of a point on the convex arc surface of the curved plate-shaped blade, which is closest to the rotating shaft 4, intersects with the axis of the rotating shaft 4.

The utility model discloses set up centrifugal fan both sides face and admit air, the air current is impressed the pipeline of giving vent to anger after getting into centrifugal blade assembly along inlet channel in opposite directions, because sealing device only undertakes the sealed of the inside negative pressure of fan, so gaseous medium can not leak to fundamentally has solved the problem that centrifugal fan leaked.

The utility model has the advantages of novel design, low energy consumption, no leakage and the like.

Drawings

Fig. 1 is a schematic front view structure diagram of a first embodiment of the present invention;

fig. 2 is a schematic front view structure diagram of a second embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the stepped section A-A of FIGS. 1 and 2.

In the accompanying figures 1, 2 and 3: the device comprises a shell 1, an air inlet pipeline 101, an air outlet pipeline 102, blades 2, a shaft sleeve 3, a rotating shaft 4, a radial plate 5, a support rod 501, a bearing 6 and a motor 7.

Detailed Description

The invention will be further explained with reference to the following drawings:

example one

As shown in fig. 1 and 3, the blade 2 in the figures is a planar plate, and the air outlet pipeline 102 is communicated with the inner cavity of the shell 1; the rotating shaft 4 is movably connected to the shell 1 through a bearing 6, and a sealing device is arranged between the rotating shaft and the shell; the radial plate 5 is two annular sheets which are oppositely and parallelly arranged, the radial plate of the two annular sheets 5 is fixedly connected by the blades 2, the blades 2 are uniformly distributed on the radial plate 5, the axial plane of each blade 2 is parallel to the axis of the rotating shaft 4, the radial plane of each blade 2 and the radial direction of the rotating shaft 4 form any angle, the blades 2 and the extension lines of the blades on the radial plate 5 are superposed with the secant of the radial plate 5, and the corresponding secant length of each blade 2 is equal and is smaller than the diameter of the radial plate 5; one end of the support rod 501 is fixedly connected with the spoke plate 5, the other end of the support rod is fixedly connected with the shaft sleeve 3, and the shaft sleeve 3 is fixedly arranged on the rotating shaft 4; the space between the inner hole of the radial plate 5 and the shaft sleeve 3 forms an air inlet channel; the air inlet pipeline 101 is respectively communicated with two ends of the air inlet channel; the motor 7 drives the centrifugal fan assembly to rotate through the rotating shaft 4, and the gas is discharged into a cavity between the outer edge of the radial plate 5 and the shell 1 through the gas inlet channel 101 under the centrifugal action and is continuously pressed into the exhaust pipeline 102. In the process, negative pressure exists in the air inlet channel, and the gas in the air inlet pipeline oppositely flows into the air inlet channel.

Example two

As shown in fig. 2 and 3, the blade 2 in the figure is a curved plate, the convex arc surface of the blade faces the rotation direction of the centrifugal fan blade assembly, and the tangent line of the point on the convex arc surface, which is closest to the rotating shaft 4, intersects with the axis of the rotating shaft 4, and the working process of the blade is the same as that of the first embodiment.

Claims

1. The utility model provides an anti-leakage centrifugal fan, it includes gas transfer passage, power transmission system and centrifugal fan blade assembly, gas transfer passage contains: the centrifugal fan blade assembly comprises a shell, an air inlet pipeline and an air outlet pipeline, wherein the air outlet pipeline is communicated with an inner cavity of the shell, and the centrifugal fan blade assembly is arranged in the shell; the power transmission system includes: pivot, motor, the pivot passes shell and centrifugal fan blade assembly, the pivot with be equipped with sealing device between the shell, the pivot with centrifugal fan blade assembly fixed connection, the motor drives the pivot rotates its characterized in that: the centrifugal fan blade assembly comprises: the radial plate is two annular sheets which are oppositely and parallelly arranged, the blades are fixedly connected and evenly distributed, the axial plane of each blade is parallel to the axis of the rotating shaft, one end of each support rod is fixedly connected with the radial plate, the other end of each support rod is fixedly connected with the corresponding shaft sleeve, and the shaft sleeves are fixedly arranged on the rotating shafts; and the space between the inner hole of the spoke plate and the shaft sleeve forms an air inlet channel.

2. The anti-leakage centrifugal fan according to claim 1, characterized in that: the number of the blades is at least three.

3. An anti-leakage centrifugal fan according to claim 1 or 2, characterized in that: the blade is in a plane plate shape.

4. An anti-leakage centrifugal fan according to claim 1 or 2, characterized in that: the blades are in a curved plate shape.

5. The anti-leakage centrifugal fan according to claim 3, wherein: the blades and the extension lines of the blades on the radial plate are overlapped with the secant lines at the position on the radial plate, and the secant lines corresponding to the blades are equal in length and smaller than the diameter of the radial plate.

6. The anti-leakage centrifugal fan according to claim 4, wherein: and a tangent line of a point on the convex arc surface of the curved plate-shaped blade, which is closest to the rotating shaft, is intersected with the axis of the rotating shaft.