Air inlet silencing box structure of high-speed centrifugal fan

Abstract

The high-speed centrifugal fan air inlet silencing box structure comprises a machine box, a base, an installation mechanism, a filtering mechanism and a silencing mechanism, the machine box is vertically arranged, the interior of the machine box is hollow, the top face of the machine box is open, a baffle is arranged on the lower portion in the machine box, an air outlet is formed in the rear side wall of the machine box, and a supporting assembly is arranged in the machine box; the supporting assembly comprises an upper cross beam and a lower cross beam; two ends of the upper cross beam are fixedly connected with the inner wall of the case; two ends of the lower cross beam are fixedly connected with the inner wall of the case; the base is connected with the bottom surface of the case; the mounting mechanism comprises a mounting plate and a connecting plate; the mounting plate is connected with the front and rear sides in the case; the connecting plates are arranged on two sides of the mounting plate, and two ends are fixedly connected with the mounting plate and the inner wall of the case; the filtering mechanism is arranged on the mounting mechanism; and the silencing mechanism is arranged between the upper cross beam and the lower cross beam. Filtering and noise elimination can be integrated, the service life of equipment is prolonged, a noise elimination corridor does not need to be specially laid in the fan room, the requirement for installation precision is low, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to centrifugal fan technical field, especially relate to a high speed centrifugal fan air intake silencer structure. BACKGROUND

[0002] The high speed centrifugal fan compresses air by the impeller rotating at high speed, and the speed is as high as several ten thousand revolutions per minute. The impeller rotating at high speed is easily damaged by the impurities in the air such as the powder layer particles and liquid drops, and partial pits or defects are generated. The strength of the impeller and the dynamic balance of the high speed rotor are greatly affected. With the further development of the damage, the high speed components such as the impeller, bearing and gear shaft are finally damaged, and the service life of the equipment is greatly reduced.

[0003] In addition, with the increasing environmental protection requirements of enterprises, the control of equipment noise is also paid more and more attention. Therefore, not only is there a high air inlet filtration requirement for the fan inlet, but also there is a very high demand for noise control. At present, most single-stage high speed centrifugal blowers adopt a relatively exposed structure. In order to improve the air inlet quality and reduce the noise, a special air inlet corridor needs to be laid outside the blower house, and the air inlet is connected with the air inlet corridor. The pipeline connection of this scheme is complex and the construction cost is high. In addition, the air inlet corridor opening and the blower air inlet are relatively independent parts, and it is difficult to ensure that they can be docked during assembly. The processing and installation are difficult. The air inlet pipeline inevitably transmits the weight and the accessory force due to the manufacturing error to the volute, and it is difficult to ensure the long-term reliability of the volute connection. There is a hidden danger of equipment operation. In addition, when the space position of the equipment needs to be changed, the air inlet corridor needs to be re-laid out, which is inconvenient to reform and has high reform cost. UTILITARIAN CONTENT

[0004] The utility model aims at providing a high speed centrifugal fan air inlet silencer structure to solve the technical problems in the above background.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A high-speed centrifugal fan intake silencer box structure includes a casing, a base, a mounting mechanism, a filtering mechanism, and a silencer mechanism. The casing is vertically arranged, hollow inside, and open at the top. The lower left and right sides of the casing have baffles that slope towards the vertical center line of the casing. An air outlet is located in the middle of the rear side wall of the casing. A support assembly is located inside the casing above the baffles. The support assembly includes an upper crossbeam and a lower crossbeam. The upper crossbeam is horizontally arranged left and right, with two beams spaced apart front and back, and its two ends are fixedly connected to the inner wall of the casing. The lower crossbeam is horizontally arranged left and right, with two beams spaced apart front and back, and its two ends are fixed to the inner wall of the casing. The inner wall is fixedly connected, and the lower crossbeam is located below the upper crossbeam; the base is vertically arranged, and its top surface is connected to the bottom surface of the chassis; the mounting mechanism includes a mounting plate and a connecting plate; the mounting plate is horizontally arranged front and back, and is located between the two upper crossbeams, with its top surface higher than the top surface of the upper crossbeam, and its two ends are fixedly connected to the front and rear sides of the chassis; the connecting plate is horizontally arranged front and back on the front and rear sides of the mounting plate, and multiple connecting plates are spaced apart on the left and right, the connecting plates are located above the upper crossbeam, and its two ends are fixedly connected to the mounting plate and the inner wall of the chassis; the filtration mechanism is located on the mounting mechanism; the silencing mechanism is located between the upper and lower crossbeams.

[0007] Furthermore, the filtration mechanism includes a tray and a filter plate; the tray is horizontally arranged on the left and right sides and is respectively disposed on the connecting plates on the front and rear sides of the mounting plate; the filter plate is horizontally disposed on the tray, and each tray is provided with multiple filter plates.

[0008] Furthermore, a filter access port is provided on the rear side wall of the chassis corresponding to the silencing mechanism; it also includes a filter door; the bottom of the filter door is connected to the front side wall of the chassis via a hinge, and the filter door can open or close the filter access port.

[0009] Furthermore, the connecting plate includes an upper connecting plate and a lower connecting plate; the upper connecting plate is located on the front side of the mounting plate, with its front end fixedly connected to the front side wall inside the chassis and its rear end fixedly connected to the upper part of the front side of the mounting plate; the lower connecting plate is located on the rear side of the mounting plate, with its front end fixedly connected to the lower part of the rear side of the mounting plate and its rear end fixedly connected to the rear side wall inside the chassis.

[0010] Furthermore, the pallet includes an upper pallet and a lower pallet; the upper pallet is horizontally disposed on the top surface of the upper connecting plate; the lower pallet is horizontally disposed on the top surface of the lower connecting plate.

[0011] Furthermore, a through groove is provided on the right side of the rear side wall of the upper tray; it also includes a limiting mechanism; the limiting mechanism includes a limiting rod, a front pressing block, and a rear pressing block; the limiting rod is horizontally arranged front and rear, and its front end is inserted into the through groove of the upper tray; the front pressing block is fixedly located on the front side of the limiting rod, and its front end face abuts against the rear side wall of the upper tray; the rear pressing block is fixedly located on the rear end of the limiting rod, and its rear end face abuts against the front side wall of the filter door.

[0012] Further, the sound attenuation mechanism comprises connecting pieces, a sound attenuation baffle, a fixing plate and a baffle stopper, the connecting pieces are horizontally arranged in front and back and are spaced apart left and right, the connecting pieces are U-shaped structures with openings upward, the sound attenuation baffle is fixed vertically in the openings of the connecting pieces, the baffle stopper is arranged at the rear end of the opening of the connecting piece, and the fixing plate is horizontally fixed on the left side of the connecting piece and is detachably connected with the top surface of the lower cross beam.

[0013] Further, the sound attenuation mechanism comprises connecting pieces, a sound attenuation baffle, a fixing plate and a baffle stopper, the connecting pieces are horizontally arranged in front and back and are spaced apart left and right, the connecting pieces are U-shaped structures with openings upward, the sound attenuation baffle is fixed vertically in the openings of the connecting pieces, the baffle stopper is arranged at the rear end of the opening of the connecting piece, and the fixing plate is horizontally fixed on the left side of the connecting piece and is detachably connected with the top surface of the lower cross beam.

[0014] Further, the sound attenuation mechanism comprises connecting pieces, a sound attenuation baffle, a fixing plate and a baffle stopper, the connecting pieces are horizontally arranged in front and back and are spaced apart left and right, the connecting pieces are U-shaped structures with openings upward, the sound attenuation baffle is fixed vertically in the openings of the connecting pieces, the baffle stopper is arranged at the rear end of the opening of the connecting piece, and the fixing plate is horizontally fixed on the left side of the connecting piece and is detachably connected with the top surface of the lower cross beam.

[0015] Further, the sound attenuation mechanism comprises connecting pieces, a sound attenuation baffle, a fixing plate and a baffle stopper, the connecting pieces are horizontally arranged in front and back and are spaced apart left and right, the connecting pieces are U-shaped structures with openings upward, the sound attenuation baffle is fixed vertically in the openings of the connecting pieces, the baffle stopper is arranged at the rear end of the opening of the connecting piece, and the fixing plate is horizontally fixed on the left side of the connecting piece and is detachably connected with the top surface of the lower cross beam.

[0016] The beneficial effects of the utility model compared with prior art are:

[0017] 1. The utility model can realize filtration and sound attenuation integration, can prevent impurities from damaging centrifugal fan through the filtration mechanism, improves equipment life, can reduce noise generated in the working process of high-speed centrifugal fan through the sound attenuation mechanism, improves working environment, and protects the health of workers, and the fan room does not need to specially lay sound attenuation corridor, and the manufacturing and installation precision requirement is low, cost is low, and equipment is safe and reliable.

[0018] 2. The filtration mechanism of the utility model forms upper and lower two layer structures through the mounting mechanism, cooperates with the filtration access and filtration door on the case, is convenient for dismounting and replacing the filtration mechanism, is simple to operate, and is convenient to use.

[0019] 3. The utility model is convenient for dismounting and replacing the sound attenuation mechanism through the sound attenuation access, sound attenuation cover plate and guiding mechanism, is simple to operate, and is convenient to use.

[0020] 4. The utility model discloses a switching mechanism is set up, and the air inlet of centrifugal fan is matched with the sealing plate and the interference, is convenient for with centrifugal fan and is connected, guarantees the leakproofness simultaneously, can also adapt to the larger installation error, and does not transfer additional force on the fan equipment, makes centrifugal fan air inlet part connection kept relative independence, and installation is convenient and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic drawing of the utility model;

[0022] Figure 2 It is the structure schematic drawing of another view of the utility model;

[0023] Figure 3 It is the internal structure schematic drawing of the utility model case;

[0024] Figure 4 It is the connection structure schematic drawing of filter mechanism and sound elimination mechanism and case of the utility model;

[0025] Figure 5 It is the connection structure schematic drawing of filter mechanism of the utility model;

[0026] Figure 6 It is the structure schematic drawing of tray of the utility model;

[0027] Figure 7 It is the structure schematic drawing of limiting mechanism of the utility model;

[0028] Figure 8 It is the connection structure schematic drawing of sound elimination mechanism of the utility model;

[0029] Figure 9 It is the connection structure schematic drawing of sound insulation baffle of the utility model;

[0030] Figure 10 It is the connection structure schematic drawing of another view of sound insulation baffle of the utility model;

[0031] Figure 11 It is the connection structure schematic drawing of switching mechanism of the utility model;

[0032] In the drawing, 1-case;11-baffle;12-air outlet;

[0033] 13-supporting assembly;131-upper crossbeam;132-lower crossbeam;

[0034] 14-filtering access hole;15-filter door;16-sound elimination access hole;17-sound elimination cover plate;

[0035] 2-base;

[0036] 3 - mounting mechanism; 31 - mounting plate; 32 - connecting plate; 321 - upper connecting plate; 322 - lower connecting plate;

[0037] 4 - filtering mechanism; 41 - tray; 411 - upper tray; 4111 - through slot; 412 - lower tray; 42 - filtering plate;

[0038] 5 - sound attenuation mechanism; 51 - connecting piece; 52 - sound attenuation baffle; 53 - fixing plate; 54 - baffle stopper;

[0039] 6 - limiting mechanism; 61 - limiting rod; 62 - front pressing block; 63 - rear pressing block;

[0040] 7 - guiding mechanism; 71 - guide; 72 - guiding stopper;

[0041] 8 - switching mechanism; 81 - switching cylinder; 82 - sealing plate;

[0042] 9 - temperature measuring port; 10 - differential pressure measuring port. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only to make the reader have a thorough understanding of one or more aspects of the present application, and the aspects of the present application can be realized even without these specific details.

[0044] As Figures 1-11As shown, a high-speed centrifugal fan intake silencer box structure, including the case 1, base 2, mounting mechanism 3, filter mechanism 4, silencer mechanism 5, the case 1 is vertically arranged, its inside hollow, top surface opening, the lower part of the case 1 inside left and right sides are provided with the baffle 11 that is inclined to the vertical center line direction of the case 1, the rear wall of the case 1 is provided with the air outlet 12, the air outlet 12 is connected with the intake of high-speed centrifugal fan, the inside of the case 1 is located above the baffle 11 and is provided with support assembly 13;The support assembly 13 includes upper beam 131, lower beam 132;The upper beam 131 is horizontally arranged left and right, and is provided with two in front and back interval, and its two ends are fixedly connected with the inner wall of the case 1;The lower beam 132 is horizontally arranged left and right, and is provided with two in front and back interval, and its two ends are fixedly connected with the inner wall of the case 1, and the lower beam 132 is located below the upper beam 131;The base 2 is vertically arranged, and the top surface is connected with the bottom surface of the case 1 by bolt;The mounting mechanism 3 includes mounting plate 31, connecting plate 32;The mounting plate 31 is horizontally arranged in front and back, and is located between the two upper beams 131, and the top surface is higher than the top surface of the upper beam 131, and the two ends are fixedly connected with the inner front and back sides of the case 1;The connecting plate 32 is horizontally arranged in front and back on the front and back sides of the mounting plate 31, and is provided with a plurality of intervals left and right, and the connecting plate 32 is located above the upper beam 131, and the two ends are fixedly connected with the inner wall of the case 1 and the mounting plate 31;The filter mechanism 4 is arranged on the mounting mechanism 3;The silencer mechanism 5 is arranged between the upper beam 131 and the lower beam 132.Gas enters from the top surface of the case 1, first passes through the filter mechanism 4 to filter the airflow, then passes through the silencer mechanism 5 to mute, then converges in the middle of the case 1 through the two inclined baffles 11 at the bottom of the case 1, and finally sends the gas into the intake of high-speed centrifugal fan through the air outlet 12.

[0045] The filter mechanism 4 includes tray 41, filter plate 42;The tray 41 is horizontally arranged left and right, and is arranged on the connecting plate 32 on the front and back sides of the mounting plate 31 respectively;The filter plate 42 is horizontally arranged on the tray 41, and three filter plates 42 are arranged on each tray 41, the filter plate 42 includes an outer frame and a filter plate arranged in the outer frame to filter, the tray 41 is through the filter plate 42 position, and the tray 41 supports the outer frame of the filter plate 42.The filter plate 42 is placed on the connecting plate 32 of the mounting mechanism 3 through the tray 41, after the airflow enters from the top of the case 1, first contacts the filter plate 42, the filter plate in the filter plate 42 filters the airflow, and removes the impurities in the airflow.

[0046] The rear side wall of the cabinet 1 is provided with a filter maintenance opening 14 corresponding to the silencing mechanism 5; further comprising a filter door 15; the bottom of the filter door 15 is connected with the front side wall of the cabinet 1 through a hinge, and the filter door 15 can open or close the filter maintenance opening 14. By setting the openable filter door 15, the filter maintenance opening 14 can be opened or closed, so as to maintain or replace the filter mechanism 4.

[0047] The connecting plate 32 comprises an upper connecting plate 321 and a lower connecting plate 322; the upper connecting plate 321 is located on the front side of the mounting plate 31, and the front end is fixedly connected with the inner front side wall of the cabinet 1, and the rear end is fixedly connected with the upper part of the front side of the mounting plate 31; the lower connecting plate 322 is located on the rear side of the mounting plate 31, and the front end is fixedly connected with the lower part of the rear side of the mounting plate 31, and the rear end is fixedly connected with the inner rear side wall of the cabinet 1. The upper connecting plate 321 and the lower connecting plate 322 form an upper and lower two-layer structure, which is convenient for replacing the filter mechanism 4.

[0048] The tray 41 comprises an upper tray 411 and a lower tray 412; the upper tray 411 is horizontally arranged on the top surface of the upper connecting plate 321; and the lower tray 412 is horizontally arranged on the top surface of the lower connecting plate 322. The upper tray 411 and the lower tray 412 are respectively arranged on the upper connecting plate 321 and the lower connecting plate 322 of the mounting mechanism 3, and form an upper and lower two-layer structure, so that when any one layer of filter plate 42 needs to be replaced, the tray 41 on the layer can be pulled out, and the filter plate 42 on the layer can be replaced conveniently.

[0049] In a further embodiment, a handle is arranged on the rear side wall of the upper tray 411, and the upper tray 411 can be pulled out conveniently through the handle, further improving the convenience of the replacement operation.

[0050] The right side of the rear side wall of the upper tray 411 is provided with a through slot 4111; the limiting mechanism 6 is further included; the limiting mechanism 6 includes a limiting rod 61, a front pressing block 62 and a rear pressing block 63; the limiting rod 61 is horizontally arranged at the front and back, and the front end of the limiting rod 61 is inserted into the through slot 4111 of the upper tray 411; the front pressing block 62 is fixedly arranged at the front side of the limiting rod 61, and the front end surface of the front pressing block 62 is abutted with the rear side wall of the upper tray 411; the rear pressing block 63 is fixedly arranged at the rear end of the limiting rod 61, and the rear end surface of the rear pressing block 63 is abutted with the front side wall of the filter door 15; after the filter door 15 is closed, the lower tray 412 is pressed between the mounting plate 31 and the filter door 15, so that the lower tray 412 is fixed, but the upper tray 411 cannot be fixed and still can be displaced, therefore, by arranging the limiting mechanism 6, by inserting the front end of the limiting rod 61 into the through slot 4111 of the upper tray 411 and by making the front pressing block 62 contact with the upper tray 411, after the filter door 15 is closed, the filter door 15 can press the rear pressing block 63 at the rear end of the limiting rod 61, so that the front pressing block 62 presses the upper tray 411, the pressing of the upper tray 411 is realized, the upper tray 411 is fixedly limited, and the displacement of the upper tray 411 is prevented.

[0051] The sound elimination mechanism 5 includes a connecting piece 51, a sound elimination baffle 52, a fixed plate 53 and a baffle 54; the connecting piece 51 is horizontally arranged at the front and back, and a plurality of connecting pieces 51 are arranged at intervals left and right; the connecting piece 51 is in U-shaped structure, and the opening of the connecting piece 51 faces upward; the sound elimination baffle 52 is fixedly and vertically arranged in the opening of the connecting piece 51; the baffle 54 is arranged at the rear end in the opening of the connecting piece 51; the fixed plate 53 is horizontally fixedly arranged at the front and back on the bottom of the left side of the connecting piece 51, and the fixed plate 53 is detachably connected with the top surface of the lower cross beam 132 through bolts; when the sound elimination mechanism 5 needs to be installed, the fixed plate 53 on the left and right sides of the connecting piece 51 is bolted and fixed with the lower cross beam 132; when the sound elimination mechanism 5 needs to be replaced, the bolts are unscrewed, the sound elimination mechanism 5 is no longer connected with the lower cross beam 132, and the sound elimination mechanism 5 can be taken out for replacement.

[0052] The guiding mechanism 7 is further included; the guiding mechanism 7 includes a guiding piece 71 and a guiding baffle 72; the guiding piece 71 is horizontally arranged at the front and back, and a plurality of guiding pieces 71 are arranged at intervals left and right corresponding to the connecting piece 51; the guiding piece 71 is in U-shaped structure, and the opening of the guiding piece 71 faces downward, and the top surface of the guiding piece 71 is fixedly connected with the bottom surface of the two upper cross beams 131 at the front and back; when the sound elimination mechanism 5 is installed, the upper end of the sound elimination baffle 17 is inserted into the opening of the guiding piece 71, and the sound elimination mechanism 5 can enter the case 1, so that the installation of the sound elimination mechanism 5 is facilitated; the guiding baffle 72 is arranged at the rear end in the opening of the guiding piece 71, and the guiding baffle 72 can limit the stroke of the sound elimination mechanism 5, so that the sound elimination mechanism 5 is prevented from falling off when being inserted into the opening of the guiding piece 71.

[0053] The sound-absorbing maintenance opening 16 is arranged on the front side wall of the cabinet 1 corresponding to the position between the upper cross beam 131 and the lower cross beam 132; the sound-absorbing cover plate 17 is further included; the sound-absorbing cover plate 17 is covered on the sound-absorbing maintenance opening 16 and is detachably connected with the front side wall of the cabinet 1 through bolts; the sound-absorbing cover plate 17 is connected with the side wall of the cabinet 1 and can open or close the sound-absorbing maintenance opening 16, thereby facilitating the maintenance and replacement of the sound-absorbing mechanism 5.

[0054] The adapter mechanism 8 is further included; the adapter mechanism 8 includes the adapter cylinder 81 and the sealing plate 82; the adapter cylinder 81 is horizontally arranged in front of and behind the cabinet 1 and is provided with a through channel in the middle part; the rear end of the adapter cylinder 81 is arranged on the air outlet 12 of the cabinet 1; the sealing plate 82 is arranged on the front end face of the adapter cylinder 81 and has an inner diameter smaller than that of the adapter cylinder 81; the sealing plate 82 is made of silica gel material and is in interference fit with the air inlet of the centrifugal fan through the sealing plate 82, thereby facilitating the connection and ensuring the sealing property.

[0055] The temperature measuring opening 9 and the pressure difference measuring opening 10 are arranged on the front side wall of the cabinet 1, thereby facilitating the measurement of the temperature and the pressure difference.

[0056] In further embodiments, a flange interface is reserved on the top of the cabinet 1; when the temperature and the air quality of the fan room do not meet the requirements of the equipment, the air inlet gallery can be connected to the outside of the fan room to intake air.

[0057] The above only describes the preferred embodiments of the present application, and it should be noted that, for the ordinary skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A high-speed centrifugal fan air inlet silencer box structure, comprising a box, a base, a mounting mechanism, a filtering mechanism and a silencing mechanism, characterized in that: The cabinet is vertically arranged, hollow inside, open at the top, and provided with a baffle inclined to the vertical center line of the cabinet at the lower part of the left and right sides inside the cabinet. A gas outlet is arranged at the middle of the rear wall of the cabinet. A support assembly is arranged above the baffle inside the cabinet. The support assembly comprises upper cross beams and lower cross beams. The upper cross beams are horizontally arranged and spaced apart in front and back, and fixedly connected to the inner wall of the cabinet at both ends. The lower cross beams are horizontally arranged and spaced apart in front and back, and fixedly connected to the inner wall of the cabinet at both ends, below the upper cross beams. The base is vertically arranged, and the top surface of the base is connected to the bottom surface of the cabinet. The mounting mechanism comprises mounting plates and connecting plates. The mounting plates are horizontally arranged in front and back, and located between the two upper cross beams. The top surface of the mounting plates is higher than the top surface of the upper cross beams. The mounting plates are fixedly connected to the inner front and back walls of the cabinet at both ends. The connecting plates are horizontally arranged in front and back on both sides of the mounting plates, and spaced apart in left and right. The connecting plates are located above the upper cross beams, and fixedly connected to the inner wall of the cabinet and the mounting plates at both ends. The filtering mechanism is arranged on the mounting mechanism. The sound elimination mechanism is arranged between the upper cross beams and the lower cross beams.

2. The sound attenuation box structure for the high-speed centrifugal fan intake according to claim 1, characterized in that: The filtering mechanism comprises trays and filtering plates. The trays are horizontally arranged in left and right, and arranged on the connecting plates on both sides of the mounting plates. The filtering plates are horizontally arranged on the trays, and a plurality of filtering plates are arranged on each tray.

3. The sound attenuation box structure for the high-speed centrifugal fan intake according to claim 2, characterized in that: A filtering maintenance opening is arranged on the rear wall of the cabinet corresponding to the sound elimination mechanism. The filtering door is connected to the front wall of the cabinet through a hinge at the bottom. The filtering door can open or close the filtering maintenance opening.

4. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 3, characterized in that: The connecting plates comprise upper connecting plates and lower connecting plates. The upper connecting plates are located on the front side of the mounting plates, and fixedly connected to the inner front wall at the front end, and fixedly connected to the upper part of the front side of the mounting plates at the rear end. The lower connecting plates are located on the rear side of the mounting plates, and fixedly connected to the inner rear wall at the front end, and fixedly connected to the rear side of the mounting plates at the rear end.

5. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 4, characterized in that: The trays comprise upper trays and lower trays. The upper trays are horizontally arranged on the top surface of the upper connecting plates. The lower trays are horizontally arranged on the top surface of the lower connecting plates.

6. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 5, characterized in that: A through slot is arranged on the right side of the rear wall of the upper tray. The limiting mechanism comprises a limiting rod, a front pressing block, and a rear pressing block. The limiting rod is horizontally arranged in front and back, and inserted into the through slot of the upper tray at the front end. The front pressing block is fixedly arranged on the front side of the limiting rod, and abuts against the rear wall of the upper tray at the front end. The rear pressing block is fixedly arranged on the rear end of the limiting rod, and abuts against the front wall of the filtering door at the rear end.

7. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 1, characterized in that: The sound elimination mechanism comprises connecting pieces, sound elimination partitions, fixing plates, and partition baffles. The connecting pieces are horizontally arranged in front and back, and spaced apart in left and right. The connecting pieces are U-shaped structures, and the openings face upwards. The sound elimination partitions are fixedly and vertically arranged in the openings of the connecting pieces. The partition baffles are arranged at the rear end of the openings of the connecting pieces. The fixing plates are horizontally and fixedly arranged on both sides of the front and back of the bottom of the left side of the connecting pieces, and detachably connected to the top surface of the lower cross beam.

8. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 7, characterized in that: The device further comprises a guiding mechanism, which comprises guiding pieces and guiding baffles; the guiding pieces are horizontally arranged in front of and behind the connecting piece and are spaced apart from each other, and the guiding pieces are U-shaped structures with openings downward and top surfaces fixedly connected to the bottom surfaces of the two upper cross beams respectively; the guiding baffles are arranged at the rear ends of the openings of the guiding pieces.

9. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 8, characterized in that: The front side wall of the case is provided with a sound-damping maintenance opening corresponding to the position between the upper cross beam and the lower cross beam; the device further comprises a sound-damping cover plate; the sound-damping cover plate is detachably connected to the front side wall of the case and covers the sound-damping maintenance opening.

10. The sound attenuation box structure for a high-speed centrifugal fan intake according to claim 1, characterized in that: The device further comprises an adapter mechanism, which comprises an adapter cylinder and a sealing plate; the adapter cylinder is horizontally arranged in front of and behind the connecting piece, and a through channel is formed in the middle part of the adapter cylinder and extends from front to back; the rear end of the adapter cylinder is arranged on the air outlet of the case; the sealing plate is arranged on the front end surface of the adapter cylinder, and the inner diameter of the sealing plate is smaller than the inner diameter of the adapter cylinder.

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