Energy-saving centrifugal fan

Abstract

The energy-saving centrifugal fan comprises a base, a volute is installed on the top face of a top plate of the base, a vertical air outlet pipe part of the volute is located at the left end of an upper wall plate of the volute, the upper wall plate of the volute is an arc-shaped wall plate, and a protruding part extending downwards is formed between the left end of the arc-shaped wall plate and a right side plate of the vertical air outlet pipe part. An impeller is installed in the volute, and the top of the impeller is close to the inner wall face of an upper wall plate of the volute. The protruding part extending downwards is formed between the left end of the upper wall plate of the volute and the right side plate of the vertical air outlet pipe part, so that the bottom end of the protruding part is close to the front portion of the top of the impeller, a gap in the position is reduced, the backflow amount of exhausted air is greatly reduced, the air displacement is improved, and the energy-saving effect is greatly improved; the device is convenient to mount, dismount, overhaul and maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan equipment technical field more specifically, relate to a kind of energy-saving centrifugal fan. BACKGROUND

[0002] Centrifugal fan is according to the principle of kinetic energy conversion into potential energy, using high-speed rotating impeller to accelerate gas, then deceleration, change flow direction, make kinetic energy into potential energy, centrifugal fan main components include casing, impeller etc.Part.Operating principle of centrifugal fan is: when motor rotates, the impeller of fan rotates with, impeller in rotation, air is thrown from impeller, air is thrown from impeller and gathered in the cavity of volute, and is discharged from gas outlet.

[0003] However, the existing volute in the installation of impeller, its one side wall surface at gas outlet end and impeller have gap, it is easy to discharge from gas outlet, and part of gas backflow to volute through the gap, thereby reduce the effective air volume of fan, increase energy consumption;

[0004] Meanwhile, the external protection cover of motor in the existing centrifugal fan is generally fixedly connected by multiple bolts, at least six bolts, so that its installation and disassembly are troublesome. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the insufficient of prior art, provide a kind of energy-saving centrifugal fan, it is formed to the right side plate between the left end of the upper wallboard of volute and vertical gas pipe part Downward-extending protruding part, so that its bottom end is close to the front part of the top of impeller, reduce the gap at this place, so that the backflow volume of discharged gas is greatly reduced, improve exhaust capacity, energy-saving effect greatly improves, and its protection cover adopts two bolts fixed, and its installation and disassembly are convenient, facilitate overhaul and maintenance.

[0006] The utility model solves the technical problem of the scheme:

[0007] A kind of energy-saving centrifugal fan, including base, the top surface of the top plate of the base is installed with volute, the vertical gas pipe part of the volute is at the left end of the upper wallboard of volute, the left end of the upper wallboard of volute is arc-shaped wallboard, and it is formed to the right side plate between vertical gas pipe part Downward-extending protruding part, impeller is installed in volute, the top of impeller is close to the inner wall surface of the upper wallboard of volute, the bottom end of protruding part is close to the front part of the top of impeller, the distance between the wall surface of the rear side to the bottom of impeller and the corresponding inner side wall of volute gradually increases from top to bottom from rear to front.

[0008] The lower part of the rear side wall of the vertical air outlet pipe part is provided with a triangular support filler block between the front part of the upper wall plate of the volute, the front side wall of the triangular support filler block is welded and fixed on the lower rear wall surface of the rear side wall of the vertical air outlet pipe part, and the bottom surface of the triangular support filler block is an arc-shaped wall surface which is close to the top surface of the front part of the upper wall plate and is welded and fixed.

[0009] The left side wall and the right side wall of the volute are both fixed with side support frames, and the bottom ends of the side support frames are fixed on the top surface of the base.

[0010] The right top surface of the base is fixed with a motor fixing frame, a motor connecting seat is arranged above the motor fixing frame, a driving motor is fixed on the top surface of the motor connecting seat, a driving wheel is fixed on the output shaft of the driving motor, the right part of the central fixed rotating shaft of the impeller extends through the middle through hole of the right side plate of the volute and is fixed in the inner ring of the bearing seat fixed on the top surface of the bearing support frame fixed on the top surface of the base at the right side of the volute, a transmission wheel is fixed on the right end of the rotating shaft, and a transmission belt is tensioned on the driving wheel and the transmission wheel.

[0011] A plurality of vertical guide rods are fixed on the bottom surface of the motor connecting seat, the vertical guide rods are inserted into the guide sleeve bodies fixed on the inner side walls of the vertical guide through holes on the top plate of the motor fixing frame, and the outer side walls of the vertical guide rods are close to the inner side walls of the corresponding guide sleeve bodies.

[0012] A vertical adjusting screw is fixed in the middle of the bottom surface of the motor connecting seat, the vertical adjusting screw is inserted into the central through hole formed in the middle of the top plate of the motor fixing frame, upper locking nuts and lower locking nuts are screwed on the vertical adjusting screw, and the top plate of the motor fixing frame is clamped between the upper locking nuts and the lower locking nuts.

[0013] The prominent effect of the utility model is:

[0014] The left end of the upper wall plate of the volute and the right side plate of the vertical air outlet pipe part form a downward extending protruding part, the bottom end of which is close to the front part of the top of the impeller, the gap at the position is reduced, the backflow amount of the discharged gas is greatly reduced, the exhaust capacity is improved, and the energy saving effect is greatly improved.

[0015] The protective cover is fixed by two bolts, the installation and dismounting are convenient, and the maintenance is convenient.

[0016] The driving motor can be adjusted in height, and the installation and dismounting of the transmission belt are very convenient. DRAWINGS

[0017] Fig. 1 It is a local structure schematic view of the utility model;

[0018] Fig. 2 It is a local sectional view of the volute of the utility model;

[0019] Fig. 3 is a partial top view of the base of the utility model;

[0020] Fig. 4 is a partial top view of the protective cover of the utility model. DETAILED DESCRIPTION

[0021] Embodiment, see as Figs. 1 to 4 shown, an energy-saving centrifugal fan, including base 10, the top surface of the top plate of base 10 is installed with volute 20, the vertical gas outlet pipe part 21 of volute 20 is at the left end of the upper wallboard of volute 20, the left end of the arc-shaped wallboard of the upper wallboard of volute 20 and the right side plate between vertical gas outlet pipe part 21 form the convex part 22 extending downward, the impeller 30 is installed in volute 20, the top of impeller 30 is close to the inner wall surface of the upper wallboard of volute 20, the bottom end of convex part 22 is close to the front part of the top of impeller 30, the distance between the wall surface from the back to the bottom of impeller 30 and the corresponding inner side wall of volute 20 gradually increases from top to bottom from back to front. Its convex part 22 makes the clearance between the wall surface of the front part of the top of impeller 30 and the back wall of the bottom end of convex part 22 greatly reduce, so that the gas discharged from vertical gas outlet pipe part 21 is basically not backflow, improves the exhaust capacity, realizes the energy-saving effect.

[0022] Further, the lower part of the back wall of vertical gas outlet pipe part 21 and the front part of the upper wallboard of volute 20 are provided with triangular support filling block 1, the front side wall of triangular support filling block 1 is welded and fixed on the lower back wall surface of the back wall of vertical gas outlet pipe part 21, the bottom surface of triangular support filling block 1 is arc-shaped wall surface and is welded and fixed on the top surface of the front part of the upper wallboard. Triangular support filling block 1 can improve the strength of volute 20 at convex part 22, so that convex part 22 is not easy to deform, ensure its use effect.

[0023] Further, the impeller 30 is a back-bending impeller, which can improve the airflow output capacity, reduce noise pollution and improve overall efficiency.

[0024] Further, the left side wall and the right side wall of volute 20 are both fixed with side support frame 23, and the bottom end of side support frame 23 is fixed on the top surface of base 10.

[0025] The right top surface of the base 10 is fixed with a motor fixing frame 11, the upper portion of the motor fixing frame 11 is provided with a motor connecting seat 12, a driving motor 13 is fixed on the top surface of the motor connecting seat 12, a driving wheel 140 is fixed on the output shaft of the driving motor 13, the right portion of the centrally fixed rotating shaft 31 of the impeller 30 extends through the central through hole of the right side plate of the volute 20 and is fixed on the inner ring of the bearing seat 15 fixed on the top surface of the bearing support frame 14 of the base 10 at the right side of the volute 20, the right end of the rotating shaft 31 is fixed with a transmission wheel 32, and a transmission belt 33 is tensioned on the driving wheel 140 and the transmission wheel 32.

[0026] The bottom surface of the motor connecting seat 12 is fixed with a plurality of vertical guide rods 150, the vertical guide rods 150 are inserted into the guide sleeve bodies 111 fixed on the inner side walls of the vertical guide through holes on the top plate of the motor fixing frame 11, and the outer side walls of the vertical guide rods 150 are tightly attached to the inner side walls of the corresponding guide sleeve bodies 111.

[0027] The central portion of the bottom surface of the motor connecting seat 12 is fixed with a vertical adjusting screw 16, the vertical adjusting screw 16 is inserted into the central through hole formed in the central portion of the top plate of the motor fixing frame 11, the upper locking nut 17 and the lower locking nut 18 are screwed on the vertical adjusting screw 16, and the top plate of the motor fixing frame 11 is clamped between the upper locking nut 17 and the lower locking nut 18.

[0028] With the structure, during use, the lower locking nut 18 can be loosened, the upper locking nut 17 can be rotated, the height position of the motor connecting seat 12 can be changed, the transmission belt 33 can be conveniently assembled and disassembled, the transmission belt 33 can be disassembled when the vertical adjusting screw 16 is lifted, the driving motor 13 is lifted, and the transmission belt 33 is not in a tensioned state, the driving motor 13 can be separated from the rotating shaft 31 and the transmission wheel 32, the driving motor 13 can be conveniently assembled and disassembled, and maintenance and repair can be facilitated.

[0029] The vertical guide rods 150 are inserted with compression springs 2, the top ends of the compression springs 2 are applied to the bottom surface of the motor connecting seat 12, the bottom ends of the compression springs 2 are applied to the top end surfaces of the corresponding guide sleeve bodies 111, radial extension edges are formed on the top end outer side walls of the guide sleeve bodies 111, and the bottom surfaces of the radial extension edges are pressed against the top surface of the top plate of the motor fixing frame 11.

[0030] During late installation, only the positions of the components such as the driving motor 13 need to be installed, the upper locking nut 17 is loosened, the lower locking nut 18 is rotated, the vertical adjusting screw 16 is lifted, the driving motor 13 is lifted, the transmission belt 33 is not in a tensioned state, the transmission belt 33 can be disassembled, the driving motor 13 can be separated from the rotating shaft 31 and the transmission wheel 32, the driving motor 13 can be conveniently assembled and disassembled, and maintenance and repair can be facilitated.

[0031] Rotating the upper locking nut 17, the vertical adjusting screw 16 is lowered, the driving motor 13 and other components are lowered, the transmission belt 33 is tensioned on the driving wheel 140 and the transmission wheel 32, and the installation is completed.

[0032] Further, the top surface of the top plate of the base 10 at the front and rear of the motor fixing frame 11 is fixed with left and right extending guide rails 3, the bottom surface of the front and rear side plates of the protective cover 50 is fixed with sliding blocks 51, the guide rail 3 is inserted into the sliding groove of the corresponding sliding block 51 and cooperates with the sliding groove, and the motor fixing frame 11 and the driving motor 13 are in the protective cover 50.

[0033] The lower part of the right side plate of the protective cover 50 is fixed with a connecting block 52 at the front and rear, and the connecting block 52 is fixed on the corresponding first connecting block 19 fixed on the top surface of the right part of the top plate of the base 10 by bolts.

[0034] The left side wall of the top plate of the protective cover 50 is pressed against the right side wall of the right side plate of the volute 20, a plurality of permanent magnet blocks are fixed in the middle of the right side wall of the right side plate of the volute 20, and the permanent magnet blocks are inserted into the corresponding grooves formed on the left side wall of the top plate of the protective cover 50 and are fixed by adsorption.

[0035] This structure makes it only need two bolts to fix the connecting block 52 when installing the protective cover 50, and the installation is completed, and when disassembling, only two bolts need to be disassembled, and then the protective cover 50 is moved to the right to realize disassembly, which is very convenient.

[0036] The protective cover 50 is fixed by bolts and permanent magnet blocks, and is convenient to install and disassemble.

[0037] The above only describes preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. An energy efficient centrifugal fan comprising a base (10) characterised in that: The top surface of the top plate of the base (10) is provided with a volute (20), the vertical air outlet pipe part (21) of the volute (20) is located at the left end of the upper wall plate of the volute (20), the upper wall plate of the volute (20) is an arc-shaped wall plate, the left end of the arc-shaped wall plate and the right side plate of the vertical air outlet pipe part (21) form a protruding part (22) extending downward, a impeller (30) is installed in the volute (20), the top of the impeller (30) is close to the inner wall surface of the upper wall plate of the volute (20), the bottom end of the protruding part (22) is close to the front part of the top of the impeller (30), and the distance between the rear side to the bottom wall surface of the impeller (30) and the corresponding inner side wall of the volute (20) gradually increases from top to bottom and from rear to front.

2. The energy efficient centrifugal fan as claimed in claim 1, wherein: The lower part of the rear side wall of the vertical air outlet pipe part (21) and the front part of the upper wall plate of the volute (20) are provided with a triangular support filling block (1), the front side wall of the triangular support filling block (1) is welded and fixed on the lower rear wall surface of the rear side wall of the vertical air outlet pipe part (21), and the bottom surface of the triangular support filling block (1) is an arc-shaped wall surface which is close to the top surface of the front part of the upper wall plate and is welded and fixed.

3. The energy efficient centrifugal fan as claimed in claim 1, wherein: The impeller (30) is a rear-bent impeller.

4. The energy efficient centrifugal fan as claimed in claim 1, wherein: The left side wall and the right side wall of the volute (20) are both fixed with a side support frame (23), and the bottom end of the side support frame (23) is fixed on the top surface of the base (10).

5. An energy efficient centrifugal fan as claimed in claim 4, wherein: The right part of the top surface of the base (10) is fixed with a motor fixing frame (11), the upper part of the motor fixing frame (11) is provided with a motor connecting seat (12), a driving motor (13) is fixed on the top surface of the motor connecting seat (12), a driving wheel (140) is fixed on the output shaft of the driving motor (13), the right part of the rotating shaft (31) fixed at the center of the impeller (30) extends out of the middle through hole of the right side plate of the volute (20) and is fixed in the inner ring of the bearing seat (15) fixed on the top surface of the bearing support frame (14) fixed on the right side of the volute (20) and the top surface of the base (10), the right end of the rotating shaft (31) is fixed with a transmission wheel (32), and a transmission belt (33) is tensioned on the driving wheel (140) and the transmission wheel (32).

6. An energy efficient centrifugal fan as claimed in claim 5, wherein: The bottom surface of the motor connecting seat (12) is fixed with a plurality of vertical guide rods (150), the vertical guide rods (150) are inserted into the guide sleeve bodies (111) fixed on the inner side walls of the vertical guide through holes on the top plate of the motor fixing frame (11), and the outer side walls of the vertical guide rods (150) are close to the inner side walls of the corresponding guide sleeve bodies (111); The middle part of the bottom surface of the motor connecting seat (12) is fixed with a vertical adjusting screw (16), the vertical adjusting screw (16) is inserted into the central through hole formed in the middle part of the top plate of the motor fixing frame (11), the vertical adjusting screw (16) is screwed with an upper locking nut (17) and a lower locking nut (18), and the top plate of the motor fixing frame (11) is clamped between the upper locking nut (17) and the lower locking nut (18).

7. An energy efficient centrifugal fan as claimed in claim 6, wherein: The vertical guide rod (150) is sleeved with a compression spring (2), the top end of the compression spring (2) is forced on the bottom surface of the motor connecting seat (12), the bottom end of the compression spring (2) is forced on the top end surface of the corresponding guide sleeve body (111), the top end outer side wall of the guide sleeve body (111) is formed with a radially extending edge, and the bottom surface of the radially extending edge is pressed against the top surface of the top plate of the motor fixing frame (11).

8. The energy efficient centrifugal fan as claimed in claim 5, wherein: The top surface of the top plate of the base (10) at the front and rear parts of the motor fixing frame (11) is fixed with left and right extending guide rails (3), the bottom surface of the front and rear side plates of the protective cover (50) is fixed with sliding blocks (51), the guide rails (3) are sleeved in the sliding grooves of the corresponding sliding blocks (51) and are matched with the sliding grooves, and the motor fixing frame (11) and the driving motor (13) are in the protective cover (50).

9. An energy efficient centrifugal fan as claimed in claim 8, wherein: The front and rear parts of the lower part of the right side plate of the protective cover (50) are fixed with connecting blocks (52), the connecting blocks (52) are fixed on the corresponding first connecting blocks (19) fixed on the top surface of the right part of the top plate of the base (10) through bolts; The left side wall of the top plate of the protective cover (50) is pressed against the right side wall of the right side plate of the volute (20), a plurality of permanent magnet blocks are fixed in the middle part of the right side wall of the right side plate of the volute (20), and the permanent magnet blocks are sleeved in the corresponding grooves formed in the left side wall of the top plate of the protective cover (50) and are fixed by adsorption.

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