CN110805564A

CN110805564A - Centrifugal fan

Info

Publication number: CN110805564A
Application number: CN201911204412.6A
Authority: CN
Inventors: 张国高; 徐景勇
Original assignee: Individual
Current assignee: Dongguan Accor Ventilation Equipment Manufacturing Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-02-18
Anticipated expiration: 2039-11-29
Also published as: CN110805564B

Abstract

The invention discloses a centrifugal fan, which comprises a frame, wherein an air inlet is arranged at the position of the right side surface of the frame, a cover plate covers the surface of the frame, a machine body is fixedly installed in the frame, an air outlet is welded at the upper end of the machine body, the air outlet is upwards exposed at the top of the frame, the cover plate is attached to the outer wall of the air outlet, a first air inlet is arranged at the front end of the machine body, two supports are arranged at the front and the back in the frame, the two supports are respectively positioned at the front and the back side surfaces of the machine body, reinforcing rods are fixed at the upper and the lower parts in the frame, the supports and the reinforcing rods are fixedly welded, and a crankshaft is assembled between the two supports; this product can reduce the vibration, utilizes the air inlet to carry out the forced air cooling to the motor simultaneously.

Description

Centrifugal fan

Technical Field

The invention relates to a centrifugal fan.

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 removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial kilns.

Among them, the common centrifugal fan is, for example, a cabinet type centrifugal fan, which is a high-efficiency and low-noise cabinet type centrifugal fan, and is convenient to install and use due to its compact structure and light weight, and is also often used for ventilation and dust exhaust in industrial production.

However, most of existing cabinet type centrifugal fans are integrally installed with a motor and a blowing fan, resonance can be caused due to vibration caused by rotation of the motor and fan blades, harm can be caused to human bodies due to the resonance, meanwhile, due to long-time work, the centrifugal fan is easy to age due to temperature gathering in the cabinet body, and generally, when the motor works at a temperature higher than 75 ℃, the motor is easy to damage, so that the service life is short and the damage is broken.

Based on the problems, the centrifugal fan capable of reducing vibration and simultaneously cooling the motor by air cooling by utilizing inlet air is designed.

Disclosure of Invention

The invention aims to provide a centrifugal fan which can reduce vibration and simultaneously utilize inlet air to cool a motor.

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

a centrifugal fan comprises a frame, an air inlet is arranged at the position of the right side face of the frame, a cover plate covers the surface of the frame, a machine body is fixedly installed inside the frame, an air outlet is welded at the upper end of the machine body and upwards exposed at the top of the frame, the cover plate is attached to the outer wall of the air outlet, a first air inlet is arranged at the front end of the machine body, two supports are arranged at the front and the rear inside the frame and respectively located at the front side face and the rear side face of the machine body, reinforcing rods are fixed inside the frame up and down, the supports and the reinforcing rods are fixedly welded, a crankshaft is assembled between the two supports, a bearing is assembled between the crankshaft and the supports, a driven pulley is connected to the front end of the crankshaft through a key, and a centrifugal fan blade is installed at the end of the crankshaft located inside the machine body, the centrifugal fan blade coaxially rotates in the machine body, negative pressure air is fed into the first air inlet, the air is discharged outwards through the air outlet after being fed in, a motor is fixedly mounted on the reinforcing rod below the centrifugal fan blade, the output end of the motor is connected with a driving belt wheel in a key mode, and a transmission belt is assembled between the driving belt wheel and the driven belt wheel; the cooling device for cooling the motor is installed inside the frame, negative pressure air is supplied to the air inlet after the centrifugal fan blade rotates, and after air is supplied, cold air acts on the motor through the cooling device, then enters the machine body and is finally discharged from the air outlet.

Preferably, a damping device is mounted between the machine body and the reinforcing rod.

Preferably, the damping device comprises a base rod fixedly mounted with the reinforcing rod, a stepped hole is formed in the base rod, a vibration stopping spring is mounted in a small hole of the stepped hole, the vibration stopping spring acts on the reinforcing rod, a movable rod is assembled through the stepped hole, two nuts are assembled on a rod wall of the movable rod, a buffer rubber ring made of rubber is sleeved on the rod wall of the movable rod, the buffer rubber ring is clamped between the two nuts, the buffer rubber ring contacts with the inner wall of the stepped hole, a check ring is in threaded connection with one end, far away from the reinforcing rod, of the base rod, the check ring limits the nuts, a plug made of rubber is inserted into one end, inserted into the stepped hole, of the movable rod, and the vibration stopping spring contacts with the plug; the organism supports through many damping device, we separate between organism and the spindle, avoid the spindle when rotatory, drive the organism, reduce the vibration of organism, in our practical application, the vibration of organism mainly derives from the air current of high-speed flow, for this reason, we have designed damping device, fixed connection between organism and the movable rod, when the organism vibrates, drive the movable rod simultaneous oscillation, the axial vibration of movable rod shakes and shakes through the cooperation of ending the spring and end cap, the radial motion of movable rod, absorb through buffering rubber ring, shake the structure through foretell, can reduce the frame vibration that leads to because the vibration of organism, reduce because the produced noise of frame vibration.

Preferably, the cooling device comprises a cover cap, the right side of the cover cap expands outwards to form an air inlet cover, the air inlet cover is attached to the inner wall of the air inlet, the motor is mounted on the inner side of the cover cap, after the centrifugal fan blades rotate, air inlet negative pressure is generated at the air inlet, air is sucked in by the negative pressure and then passes through the cover cap after passing through the air inlet cover, and the air passes through the cover cap and then contacts the motor.

Preferably, the cooling device comprises an air box, the motor is installed in the air box, the air box is composed of an upper part and a lower part, the two parts are connected through bolts, a hole for penetrating through a motor shaft is formed in the front end of the air box, an air inlet pipe is arranged at the position, close to the upper part, on the right side of the air box, an air outlet pipe is arranged at the position, close to the lower part, on the left side of the air box, a first air inlet cover is arranged on the inner side of the air inlet, glass cement is coated between the first air inlet cover and the inner wall of the air inlet to form sealing, a connecting pipe is arranged at the left side of the first air inlet cover, and a guide; when the structure is adopted, the sealing of the whole device needs to be kept, only the air outlet is used for air outlet, and the air inlet is used for air inlet.

Preferably, the cover plate comprises a surface plate, a middle plate and an inner plate, the surface plate, the middle plate and the inner plate are sequentially glued and fixed, and a honeycomb sound absorption hole is formed in the position, away from the middle plate, of one side face of the inner plate through injection molding; the middle layer plate is made of rubber, grid grooves are uniformly distributed on the surface of the middle layer plate, and the surface layer plate is a color steel plate.

The invention has the beneficial effects that:

1) in the product, the damping device can realize the damping of the machine body, reduce the resonance of the frame and reduce the noise generated by vibration;

2) in the product, air is formed through the cooling device, the motor is passively radiated through the cooling device, and the air flow is utilized to realize cooling while negative pressure air is fed;

3) the structure of this product is comparatively simple, and the cost is comparatively cheap, is fit for using widely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

FIG. 2 is a schematic internal view of the present product;

FIG. 3 is a top view of a centrifugal fan blade;

FIG. 4 is a top view of the present product;

FIG. 5 is a top view of the frame;

FIG. 6 is a schematic view of the installation of the cooling device;

FIG. 7 is a view showing an embodiment of a cooling apparatus;

FIG. 8 is a view showing an embodiment of a cooling apparatus;

FIG. 9 is a cross-sectional view of a shock absorbing device;

FIG. 10 is a front view of the skin panel;

FIG. 11 is a front view of the middle deck;

FIG. 12 is a front view of the inner panel.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

Further, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "sleeved," "connected," "penetrating," "plugged," and the like are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1

Referring to fig. 1 to 6, a centrifugal fan includes a frame 1, an air inlet 2 is disposed at a right side of the frame 1, a cover plate 3 covers a surface of the frame 1, a body 4 is fixedly mounted inside the frame 1, an air outlet 401 is welded to an upper end of the body 4, the air outlet 401 is upwardly exposed at a top of the frame 1, the cover plate 3 is attached to an outer wall of the air outlet 401, a first air inlet 402 is disposed at a front end of the body 4, two brackets 5 are disposed at front and rear sides inside the frame 1, the two brackets 5 are respectively disposed at front and rear sides of the body 4, a reinforcing rod 6 is fixed at upper and lower positions inside the frame 1, the brackets 5 and the reinforcing rod 6 are welded and fixed, a crankshaft 7 is assembled between the two brackets 5, and a bearing 701 is assembled between the crankshaft 7 and the brackets 5, a driven pulley 702 is keyed at the front end of the crankshaft 7, a centrifugal fan blade 8 is installed at the end of the crankshaft 7 located inside the machine body 4, after the centrifugal fan blade 8 coaxially rotates inside the machine body 4, negative pressure air is supplied at the first air inlet 402, after air is supplied, the air is discharged outside through the air outlet 401 via centrifugal force, a motor 9 is fixedly installed on the reinforcing rod 6 below, a driving pulley 901 is keyed at the output end of the motor 9, and a driving belt 10 is assembled between the driving pulley 901 and the driven pulley 702; a cooling device 11 for cooling the motor is arranged in the frame 1, negative pressure air is supplied to the air inlet 2 after the centrifugal fan blade 8 rotates, and cold air passes through the cooling device 11 to act on the motor 9 after the air is supplied, then enters the machine body 4 and is finally discharged from the air outlet 401.

Example 2

Referring to fig. 2, a damping device 12 is installed between the body 4 and the reinforcing bar 6.

Example 3

Referring to fig. 2 and 9, the damping device 12 includes a base rod 111 fixedly installed with the reinforcing rod 6, the base rod 111 has a stepped hole 112 therein, a vibration stopping spring 113 is installed in a small hole of the stepped hole 112, the wire diameter of the vibration stopping spring is 2mm, the vibration stopping spring 113 acts on the reinforcing rod 6, the movable rod 114 is assembled through the stepped hole 112, two nuts 115 are assembled on a rod wall of the movable rod 114, a buffer rubber ring 116 made of rubber is sleeved on the rod wall of the movable rod 114, the buffer rubber ring 116 is clamped between the two nuts 115, the buffer rubber ring 116 contacts an inner wall of the stepped hole 112, a retainer ring 117 is connected to a thread at an end of the base rod 111 far from the reinforcing rod 6, the retainer ring 117 forms a limit for the nut 115, a plug 118 made of rubber is inserted into an end of the movable rod 114 inserted into the stepped hole 112, the vibration stopping spring 113 contacts the plug 118 head; the organism supports through many damping device, we separate between organism and the spindle, avoid the spindle when rotatory, drive the organism, reduce the vibration of organism, in our practical application, the vibration of organism mainly derives from the air current of high-speed flow, for this reason, we have designed damping device, fixed connection between organism and the movable rod, when the organism vibrates, drive the movable rod simultaneous oscillation, the axial vibration of movable rod shakes and shakes through the cooperation of ending the spring and end cap, the radial motion of movable rod, absorb through buffering rubber ring, shake the structure through foretell, can reduce the frame vibration that leads to because the vibration of organism, reduce because the produced noise of frame vibration.

Example 4

Referring to fig. 7, the cooling device 11 includes a cover 121, the right side of the cover 121 expands outward to form an air inlet cover 122, the air inlet cover 122 is attached to the inner wall of the air inlet 2, the motor is mounted inside the cover, when the centrifugal fan rotates, air inlet negative pressure is generated at the air inlet, air is sucked into the air inlet cover by the negative pressure and then passes through the cover, and the air passes through the cover and contacts the motor.

Example 5

Referring to fig. 8, the cooling device 11 includes a wind box 131, the motor 9 is installed in the wind box 131, the wind box 131 is composed of an upper portion and a lower portion, the two portions are connected by bolts, a hole 132 for passing through a motor shaft is formed at the front end of the wind box 131, an air inlet pipe 133 is disposed at a position on the right side of the wind box 131 close to the upper portion, an air outlet pipe 134 is disposed at a position on the left side of the wind box 131 close to the lower portion, a first air inlet cover 135 is disposed at the inner side of the air inlet 2, a space between the first air inlet cover 135 and the inner wall of the air inlet 2 is coated with glass cement to form a seal, a connecting pipe 136 is disposed at the left side of the first air inlet cover 135, and a guide pipe; when the structure is adopted, the sealing of the whole device needs to be kept, only the air outlet is used for air outlet, and the air inlet is used for air inlet.

Example 6

Referring to fig. 10, 11 and 12, the cover plate 3 includes a surface plate 311, a middle plate 312 and an inner plate 313, the surface plate 311, the middle plate 312 and the inner plate 313 are sequentially glued and fixed, and a honeycomb sound absorption hole 314 is formed at a side of the inner plate 313 away from the middle plate 312 by injection molding; the middle layer plate 313 is made of rubber, grid grooves 315 are uniformly distributed on the surface of the middle layer plate, and the surface layer plate 311 is a color steel plate.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A centrifugal fan, its characterized in that: the fan blade air-conditioner comprises a frame, an air inlet is formed in the position of the right side face of the frame, a cover plate covers the surface of the frame, an organism is fixedly installed inside the frame, an air outlet is welded at the upper end of the organism, the air outlet is upwards exposed at the top of the frame, the cover plate is attached to the outer wall of the air outlet, a first air inlet is formed in the front end of the organism, two supports are arranged in the front and back of the inside of the frame, the two supports are respectively located on the front side face and the back side face of the organism, reinforcing rods are fixed in the frame up and down, the supports and the reinforcing rods are welded and fixed, a crankshaft is assembled between the two supports, a bearing is assembled between the crankshaft and the supports, a driven pulley is connected to the front end of the crankshaft through a key, and a centrifugal fan blade is installed at the end, the centrifugal fan blade coaxially rotates in the machine body, negative pressure air is fed into the first air inlet, the air is discharged outwards through the air outlet after being fed in, a motor is fixedly mounted on the reinforcing rod below the centrifugal fan blade, the output end of the motor is connected with a driving belt wheel in a key mode, and a transmission belt is assembled between the driving belt wheel and the driven belt wheel; the cooling device for cooling the motor is installed inside the frame, negative pressure air is supplied to the air inlet after the centrifugal fan blade rotates, and after air is supplied, cold air acts on the motor through the cooling device, then enters the machine body and is finally discharged from the air outlet.

2. The centrifugal fan of claim 1, wherein: and a damping device is assembled between the machine body and the reinforcing rod.

3. The centrifugal fan of claim 2, wherein: damping device includes one and stiffener fixed mounting's base pole, the inside of base pole has a shoulder hole install a damping spring in the aperture of shoulder hole, damping spring effect the stiffener, through the shoulder hole is equipped with the movable rod, be equipped with two nuts on the pole wall of movable rod the cover is equipped with the buffering rubber ring of a rubber material on the pole wall of movable rod, buffering rubber ring is pressed from both sides and is established two between the nut, the contact of buffering rubber ring the inner wall of shoulder hole the base pole is kept away from that end screw thread of stiffener has a retaining ring, the retaining ring is right the nut forms spacingly the movable rod insert to the end cap that rubber material has been inserted to that one end in the shoulder hole, damping spring contact the end cap.

4. The centrifugal fan of claim 1, wherein: the cooling device comprises a cover cap, the right side of the cover cap is expanded outwards to form an air inlet cover, the air inlet cover is attached to the inner wall of the air inlet, the motor is installed on the inner side of the cover cap, after the centrifugal fan blade rotates, air inlet negative pressure is generated at the air inlet, air is sucked in by the negative pressure and then passes through the cover cap after passing through the air inlet cover, and the air passes through the cover cap and then contacts with the motor.

5. The centrifugal fan of claim 1, wherein: cooling device includes an bellows, the motor is installed in the bellows, two parts constitute about the bellows, bolted connection between two parts the hole that passes the motor shaft usefulness is seted up to the front end of bellows, the upper portion position department that is close to on bellows right side is provided with the air-supply line, the left lower part position department that is close to of bellows is provided with out the tuber pipe the inboard of air intake is provided with first air inlet cover, first air inlet cover with it forms sealedly to scribble after glass glues between the air intake inner wall, the left side department of first air inlet cover is provided with the connecting pipe, the connecting pipe with be equipped with the pipe between the air-supply line.