Anti-explosion low-noise box type centrifugal fan

Abstract

The utility model discloses an anti-explosion low-noise box type centrifugal fan which comprises a main box body, the main box body comprises an outer shell and an inner shell, and sound insulation cotton is filled between the outer shell and the inner shell. The inner shell is made of a perforated plate; a volute is installed in the main box body, the air outlet end of the volute is fixed to the inner side wall of a left end plate of the main box body and communicated with an air outlet through hole formed in the middle of the left end plate of the main box body, an air outlet connecting part is fixed to the left side wall of the left end plate of the main box body, and the air outlet connecting part is communicated with the air outlet through hole. The side fixing plates are convenient to mount and dismount, and meanwhile, the noise reduction effect of the main box body is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan equipment technical field more specifically, relates to a kind of low-noise box type centrifugal fan of explosion-proof. BACKGROUND

[0002] In the existing box type centrifugal fan, it is generally provided with an air inlet and an air outlet, the space at the air inlet is larger, so that during the later maintenance, only the connecting pipe at the air inlet needs to be disassembled, and then the internal components can be maintained and operated, but the connecting pipe needs to be disassembled every time, which makes the maintenance more troublesome and the effect is not ideal.

[0003] Therefore, some box type centrifugal fans are provided with a maintenance slot at the side plate of the box body, which is covered by a cover plate fixed by bolts. During maintenance, the cover plate can be opened for operation, but the disassembly and assembly of the cover plate are relatively troublesome.

[0004] Meanwhile, although the existing box type centrifugal fan has a noise reduction effect during movement, the effect is still limited. UTILITY MODEL CONTENTS

[0005] The utility model aims to overcome the shortcomings of the prior art and provide a low-noise box type centrifugal fan with explosion-proof function, which is provided with a side fixing plate that is easy to install and disassemble, and has a good noise reduction effect.

[0006] The technical problem of the utility model is solved by the following solution:

[0007] A low-noise box type centrifugal fan with explosion-proof function comprises a main box body, which comprises an outer shell and an inner shell, and the space between the outer shell and the inner shell is filled with sound insulation cotton; the inner shell is made of a perforated plate;

[0008] A volute is installed in the main box body, the air outlet end of the volute is fixed to the inner side wall of the left end plate of the main box body and communicates with the air outlet hole formed in the middle part of the left end plate of the main box body, and a air outlet connecting part is fixed to the left side wall of the left end plate of the main box body and communicates with the air outlet hole;

[0009] A rear air inlet slot is formed in the middle part of the right end plate of the main box body;

[0010] A plurality of transverse connecting beams are fixed to the top surface of the bottom plate at the right part of the main box body, an explosion-proof motor is fixed to the transverse connecting beams by bolts, a driving wheel is fixed to the output shaft of the explosion-proof motor, an impeller is inserted into the volute, the center shaft of the impeller extends out of the front and rear wall plates of the volute and is movably connected to the support frame fixed to the top surface of the bottom plate of the main box body at the front and rear parts of the volute through bearings, a transmission wheel is fixed to one end of the center shaft, and a transmission belt is tensioned between the driving wheel and the transmission wheel.

[0011] The middle part of the front side plate or the rear side plate of the main box body is formed with an inspection through slot, and a side fixing plate is fixed on the front side plate or the rear side plate of the main box body and covers the corresponding inspection through slot.

[0012] The inner side wall at the outer end of the inspection through slot is formed with a rectangular frame type slot, the side fixing plate comprises an outer fixing plate and an inner rectangular shell made of a porous plate and fixed at the inner side of the outer fixing plate, the outer end of the inner rectangular shell is welded and fixed on the inner side wall of the outer fixing plate, sound insulation cotton is filled in the space between the inner rectangular shell and the outer fixing plate, the inner rectangular shell is inserted into the inner end of the inspection through slot, the outer side wall of the inner rectangular shell is tightly attached to the inner side wall of the inner end of the inspection through slot, the edge part of the outer fixing plate is inserted into the rectangular frame type slot, the inner end surface of the edge part of the outer fixing plate is pressed against the inner end surface of the rectangular frame type slot, and a holding handle is fixed on the outer side wall of the outer fixing plate.

[0013] A plurality of threaded through holes are formed on the inner side wall at the inner end of the inspection through slot, a ball head plunger is threaded in the corresponding threaded through hole, and the steel ball part of the ball head plunger protrudes out of the inner side wall of the inspection through slot and is nested in the corresponding side wall of the inner rectangular shell.

[0014] A rotating pressing block is movably connected to the front side plate or the rear side plate of the main box body around the inspection through slot through a hinge shaft, the end part of the rotating pressing block is located at the outer side of the edge part of the outer fixing plate, and the inner end surface of the end part of the rotating pressing block is tightly attached to the outer wall surface of the edge part of the outer fixing plate.

[0015] The prominent effect of the utility model is:

[0016] The side fixing plate is provided with a rotating pressing block for rotation and pressing, so that the installation and dismounting are convenient, the sound insulation cotton in the main box body has a sound absorption effect and reduces noise, the inner shell is made of a porous plate and also has a noise reduction effect, and therefore the noise reduction effect of the main box body is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a partial structure schematic view of the utility model;

[0018] Figure 2 is Figure 1 a partial enlarged view of

[0019] Figure 3 is a partial structure schematic view between the main box body and the side fixing plate;

[0020] Figure 4 is a partial sectional view between the main box body and the side fixing plate;

[0021] Figure 5 is Figure 4 a partial enlarged view of DETAILED DESCRIPTION:

[0022] Embodiments, see as Figures 1 to 5 As shown in the drawings, an anti-explosion low-noise box type centrifugal fan comprises a main box body 10, the main box body 10 comprises an outer shell and an inner shell, and sound insulation cotton 1 is filled between the outer shell and the inner shell; the inner shell is made of a perforated plate; the sound insulation cotton 1 and the inner shell of the perforated plate achieve a noise reduction effect.

[0023] A volute 20 is installed in the main box body 10, an air outlet end of the volute 20 is fixed at an inner side wall of a left end plate of the main box body 10 and communicates with an air outlet through hole formed in a middle part of the left end plate of the main box body 10, an air outlet connecting part 11 is fixed on a left side wall of the left end plate of the main box body 10 and communicates with the air outlet through hole; vertical support frames are fixed on outer side walls of front and rear wall plates of the volute 20, and bottom ends of the vertical support frames are fixed on a top surface of a bottom plate of the main box body 20.

[0024] A rear air inlet through slot 12 is formed in a middle part of a right end plate of the main box body 10;

[0025] A plurality of transverse connecting beams 13 are fixed on the top surface of the bottom plate at the right part of the main box body 10, an anti-explosion motor 30 is fixedly connected on the transverse connecting beams 13 through bolts, a driving wheel 31 is fixed on an output shaft of the anti-explosion motor 30, an impeller is inserted into the volute 20, both ends of a central rotating shaft of the impeller protrude from the front and rear wall plates of the volute 20 and are movably connected on support frames 110 fixed on the top surface of the bottom plate of the main box body 10 at the front and rear parts of the volute 20 through bearings, one end of the central rotating shaft is fixed with a transmission wheel 22, and a transmission belt 2 is tensioned on the driving wheel 31 and the transmission wheel 22; the transmission wheel 22 and the driving wheel 31 are synchronous pulleys, and the transmission belt 2 is a synchronous belt.

[0026] An inspection through slot 12 is formed in a middle part of the front or rear side plate of the main box body 10, and a side fixed plate 50 is fixed on the front or rear side plate of the main box body 10 and covers the corresponding inspection through slot 12.

[0027] Further, the transverse connecting beam 13 is a channel steel, a plurality of waist-shaped through slots are formed in a middle part of a top plate of the channel steel, through holes are formed in a connecting support part of the anti-explosion motor 30, screw rod parts of fixing bolts are inserted into the corresponding waist-shaped through slots and the through holes, rotating parts of the fixing bolts are pressed against a bottom surface of the top plate of the transverse connecting beam 13, a bottom surface of the connecting support part of the anti-explosion motor 30 is pressed against a top surface of the top plate of the transverse connecting beam 13, a gasket is inserted into a part of the screw rod part of the fixing bolt protruding from the top surface of the connecting support part and is screwed with a fixing nut, and the gasket is clamped between the fixing nut and the top surface of the connecting support part.

[0028] The structure makes the fixed nut be loosened when the transmission belt 2 is installed, the explosion-proof motor 20 is moved left along the transverse connecting beam 13, the distance between the transmission wheel 22 and the driving wheel 31 is reduced, the transmission belt 2 is conveniently installed or removed, the explosion-proof motor 20 is moved right along the transverse connecting beam 13 after installation, the transmission belt 2 is ensured in a tension state, and the fixed nut is tightened, so that the installation difficulty is reduced, and the installation effect is good.

[0029] Further, the inner side wall at the outer end of the maintenance through slot 12 is shaped as a rectangular frame slot, the side fixing plate 50 comprises an outer fixing plate 51 and an inner rectangular shell 52 made of a perforated plate and fixed at the inner side of the outer fixing plate 51, the outer end of the inner rectangular shell 52 is welded and fixed on the inner side wall of the outer fixing plate 51, sound insulation cotton 1 is filled in the space between the inner rectangular shell 52 and the outer fixing plate 51, the inner rectangular shell 52 is inserted into the inner end of the maintenance through slot 12, the outer side wall thereof abuts against the inner side wall of the inner end of the maintenance through slot 12, the edge portion of the outer fixing plate 51 is inserted into the rectangular frame slot, the inner end face of the edge portion of the outer fixing plate 51 abuts against the inner end face of the rectangular frame slot, and two holding handles 53 are fixed on the outer side wall of the outer fixing plate 51.

[0030] Further, a plurality of threaded holes are formed on the inner side wall at the inner end of the maintenance through slot 12, the ball head plunger 3 is screwed in the corresponding threaded hole, and the steel ball portion of the ball head plunger 3 extends out of the inner side wall of the maintenance through slot 12 and is nested in the corresponding recess on the side wall of the inner rectangular shell 52. The ball head plunger 3 can improve the positioning effect of the inner rectangular shell 52 during installation of the side fixing plate 50.

[0031] Further, the front side plate or the rear side plate of the main box body 10 around the maintenance through slot 12 is movably connected with a rotating pressing block 60 through a hinge shaft, the end portion of the rotating pressing block 60 is located at the outer side of the edge portion of the outer fixing plate 51, and the inner end face of the end portion of the rotating pressing block 60 abuts against the outer wall face of the edge portion of the outer fixing plate 51.

[0032] Further, the middle part of the end of the rotating pressing block 60 is formed with an expansion hole 61, the outer wall surface of the end of the corresponding rotating pressing block 60 is fixed with a supporting shell 62, the inside of the supporting shell 62 is formed with a cylindrical cavity, a circular supporting block 63 and a buffer compression spring 64 are inserted into and matched with the cylindrical cavity, the middle part of the circular supporting block 63 is fixed with a front and back extending positioning column 631, the inner end of the positioning column 631 extends out of the expansion hole 61 and is inserted into the corresponding positioning recess hole 511 in the outer wall surface of the edge of the outer fixed plate 51, the outer end of the positioning column 631 extends out of the outer through hole formed in the middle part of the outer end surface of the cylindrical cavity and is fixed with a pressing part 632, the pressing part 632 presses against the outer wall surface of the outer end plate of the supporting shell 62, one end of the buffer compression spring 64 presses against the outer end surface of the circular supporting block 63 and the other end presses against the inner end surface of the outer end plate of the supporting shell 62, the positioning column 631 is inserted into the buffer compression spring 64, and the inner end surface of the circular supporting block 63 presses against the outer wall surface of the end of the rotating pressing block 60.

[0033] When the side fixed plate 50 needs to be disassembled, the corresponding pressing part 632 is pulled outwards, so that the corresponding buffer compression spring 64 is compressed, the inner end of the positioning column 631 is moved out of the corresponding positioning recess hole 511, then the rotating pressing block 60 is rotated, so that the end of the rotating pressing block 60 is no longer tightly attached to the outer wall surface of the edge of the outer fixed plate 51, when all the rotating pressing blocks 60 are moved out, the side fixed plate 50 can be pulled outwards by holding the holding handle 53, so that the side fixed plate 50 is disassembled, which is very convenient.

[0034] When the side fixed plate 50 needs to be disassembled, the corresponding pressing part 632 is pulled outwards, so that the corresponding buffer compression spring 64 is compressed, the inner end of the positioning column 631 is moved out of the corresponding positioning recess hole 511, then the rotating pressing block 60 is rotated, so that the end of the rotating pressing block 60 is no longer tightly attached to the outer wall surface of the edge of the outer fixed plate 51, when all the rotating pressing blocks 60 are moved out, the side fixed plate 50 can be pulled outwards by holding the holding handle 53, so that the side fixed plate 50 is disassembled, which is very convenient.

[0035] Then, the corresponding pressing part 632 is pulled outwards, at the same time, the rotating pressing block 60 is rotated, so that the end of the rotating pressing block 60 is located at the outside of the edge of the outer fixed plate 51, the inner end surface of the end of the rotating pressing block 60 tightly attaches to the outer wall surface of the edge of the outer fixed plate 51, at the same time, the inner end of the positioning column 631 is aligned with the corresponding positioning recess hole 511, the pressing part 632 is loosened, the inner end of the positioning column 631 is inserted into the corresponding positioning recess hole 511 through the elastic recovery of the buffer compression spring 64, so that the positioning column 631 is installed, all the rotating pressing blocks 60 are sequentially installed in this way, so that the installation is completed, which is convenient for installation and has good installation effect.

[0036] The preferred embodiments of the utility model are described above, it should be pointed out that, for ordinary skilled person in the art, without departing from the technical principles of the utility model, a number of improvements and refinements can be made, these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. An explosion-proof low-noise box-type centrifugal fan comprising a main casing (10), characterized in that: The main box body (10) comprises an outer shell and an inner shell, and the space between the outer shell and the inner shell is filled with sound insulation cotton (1); the inner shell is made of a perforated plate; The volute (20) is installed in the main box body (10), the air outlet end of the volute (20) is fixed at the inner side wall of the left end plate of the main box body (10) and communicates with the air outlet through hole formed in the middle part of the left end plate of the main box body (10), the air outlet connecting part (11) is fixed on the left side wall of the left end plate of the main box body (10) and communicates with the air outlet through hole; The middle part of the right end plate of the main box body (10) is formed with a rear air inlet through slot (12); The top surface of the bottom plate at the right part of the main box body (10) is fixed with a plurality of transverse connecting beams (13), the explosion-proof motor (30) is fixed and connected on the transverse connecting beams (13) through bolts, the output shaft of the explosion-proof motor (30) is fixed with a driving wheel (31), the volute (20) is inserted with an impeller, the both ends of the central rotating shaft of the impeller protrude out of the front and rear wall plates of the volute (20) and are movably connected on the support frame (110) fixed on the top surface of the bottom plate of the main box body (10) at the front and rear parts of the volute (20) through bearings, one end of the central rotating shaft is fixed with a transmission wheel (22), and the transmission belt (2) is tensioned on the driving wheel (31) and the transmission wheel (22). The middle part of the front side plate or the rear side plate of the main box body (10) is formed with an inspection through slot (12), and the side fixed plate (50) is fixed on the front side plate or the rear side plate of the main box body (10) and covers the corresponding inspection through slot (12).

2. The explosion-proof low-noise canned centrifugal fan according to claim 1, characterized in that: The transmission wheel (22) and the driving wheel (31) are synchronous pulleys, and the transmission belt (2) is a synchronous belt.

3. The explosion-proof low-noise canned centrifugal fan according to claim 1, characterized in that: The transverse connecting beam (13) is a channel steel, the middle part of the top plate of the transverse connecting beam (13) is formed with a plurality of waist-shaped through slots, the connecting support part of the explosion-proof motor (30) is formed with a through hole, the screw rod part of the fixing bolt is inserted in the corresponding waist-shaped through slot and the through hole, the rotating part of the fixing bolt is pressed against the bottom surface of the top plate of the transverse connecting beam (13), the bottom surface of the connecting support part of the explosion-proof motor (30) is pressed against the top surface of the top plate of the transverse connecting beam (13), the gasket is inserted in the part of the screw rod part of the fixing bolt protruding out of the top surface of the connecting support part and is screwed with the fixing nut, and the gasket is clamped between the fixing nut and the top surface of the connecting support part.

4. The explosion-proof low-noise canned centrifugal fan according to claim 1, characterized in that: The inner side wall at the outer end of the inspection through slot (12) is formed with a rectangular frame-shaped slot, the side fixed plate (50) comprises an outer fixed plate (51) and an inner rectangular shell (52) made of a perforated plate and fixed at the inner side of the outer fixed plate (51), the outer end of the inner rectangular shell (52) is welded and fixed on the inner side wall of the outer fixed plate (51), the space between the inner rectangular shell (52) and the outer fixed plate (51) is filled with sound insulation cotton (1), the inner rectangular shell (52) is inserted into the inner end of the inspection through slot (12), the outer side wall of the inner rectangular shell (52) is tightly attached to the inner side wall of the inner end of the inspection through slot (12), the edge part of the outer fixed plate (51) is inserted in the rectangular frame-shaped slot, the edge inner end surface of the outer fixed plate (51) is pressed against the inner end surface of the rectangular frame-shaped slot, and the outer side wall of the outer fixed plate (51) is fixed with a holding handle (53).

5. The explosion-proof low-noise canned centrifugal fan according to claim 4, characterized in that: A plurality of screwing through holes are formed on the inner side wall at the inner end of the maintenance through slot (12), and the ball head plunger (3) is screwed in the corresponding screwing through hole, and the steel ball part of the ball head plunger (3) extends out of the inner side wall of the maintenance through slot (12) and is nested in the corresponding recess hole on the side wall of the inner rectangular shell (52).

6. The explosion-proof low-noise canned centrifugal fan according to claim 4, characterized in that: A rotating pressing block (60) is movably connected to the front side plate or the rear side plate of the main box (10) around the maintenance through slot (12) through a hinge shaft, the end part of the rotating pressing block (60) is located at the outside of the edge part of the outer fixed plate (51), and the inner end surface of the end part of the rotating pressing block (60) is tightly attached to the outer wall surface of the edge part of the outer fixed plate (51).

7. The explosion-proof low-noise canned centrifugal fan according to claim 6, characterized in that: The middle part of the end part of the rotating pressing block (60) is formed with an expansion through hole (61), a support shell (62) is fixed on the outer wall surface of the end part of the corresponding rotating pressing block (60), the inside of the support shell (62) is formed with a cylindrical inner cavity, a circular support block (63) and a buffer compression spring (64) are inserted into and matched with the cylindrical inner cavity, the middle part of the circular support block (63) is fixed with a front and rear extending positioning column (631), the inner end of the positioning column (631) extends out of the expansion through hole (61) and is inserted into the corresponding positioning recess hole (511) on the outer wall surface of the edge part of the outer fixed plate (51), the outer end of the positioning column (631) extends out of the outer through hole formed in the middle part of the outer end surface of the cylindrical inner cavity and is fixed with a pressing part (632) which is pressed against the outer wall surface of the outer end plate of the support shell (62), one end of the buffer compression spring (64) is applied to the outer end surface of the circular support block (63) and the other end is applied to the inner end surface of the outer end plate of the support shell (62), the positioning column (631) is inserted into the buffer compression spring (64), and the inner end surface of the circular support block (63) is pressed against the outer wall surface of the end part of the rotating pressing block (60).

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