A variable ducted stainless steel silencer box for fan silencing

Abstract

The present invention discloses a variable ducted stainless steel silencer box for fan silencer, comprising a main silencer structure, a middle silencer structure connected to the main silencer structure, and a tail silencer structure; the main silencer structure comprises a coaxially arranged main silencer outer cylinder and a main silencer inner cylinder, the main silencer inner cylinder is arranged inside the main silencer outer cylinder, and a silencer circulation channel is formed between the outer wall of the main silencer inner cylinder and the inner wall of the main silencer outer cylinder; a duct variable diameter mechanism is provided in the silencer circulation channel, comprising a plurality of first variable diameter guide blades and a second variable diameter guide blades, which together form an annular duct variable diameter guide ring; the silencer box has a highly efficient noise reduction function, can effectively absorb, reflect and reduce isolation noise, and reduce the noise level generated when the fan is running and when the air is circulating; considering the noise with differentiated frequencies generated due to the difference in air flow rate, the main silencer structure is designed as a variable ducted structure, which can cope with noise in a variety of complex situations.

Description

Technical Field

[0001] The invention relates to the technical field of silencer boxes, in particular to a variable duct type stainless steel silencer box used for fan silencer. Background Art

[0002] A silencer box refers to an air flow duct that also transmits noise. It can use pipes and elbows with sound-absorbing linings, or sudden changes in cross-sectional area, or other acoustic impedance methods to attenuate or reflect the noise in the duct.

[0003] Most of the existing sound-absorbing boxes adopt the impedance composite sound-absorbing principle, which is not only complex in structure and heavy in weight, but also uses high-temperature oxidation sound-absorbing fillers with poor impact resistance. The sound-absorbing fillers are easily damaged after being impacted by high-speed airflow, which in turn affects their sound absorption and noise reduction effects. In addition, the existing sound-absorbing fillers are easily penetrated by water vapor, resulting in a significant decrease in the performance of the sound-absorbing fillers and requiring frequent maintenance. Summary of the invention

[0004] The object of the present invention is to provide a variable ducted stainless steel silencer box for fan silencing, which can better achieve the fan silencing effect.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A variable ducted stainless steel silencer box for fan silencer, comprising a main silencer structure, a middle silencer structure connected to the main silencer structure, and a tail silencer structure;

[0007] The main body silencer structure comprises a main body silencer outer cylinder and a main body silencer inner cylinder which are coaxially arranged, and a silencer flow channel is formed between the outer side wall of the main body silencer inner cylinder and the inner side wall of the main body silencer outer cylinder;

[0008] A duct variable diameter mechanism is provided in the muffler circulation channel, and the duct variable diameter mechanism includes a plurality of first variable diameter guide blades and second variable diameter guide blades, and the first variable diameter guide blades and the second variable diameter guide blades together form an annular duct variable diameter guide ring;

[0009] A plurality of first variable-diameter drive receiving cylinders connected to the interior of the muffler flow channel are fixed on the outer side wall of the main muffler outer cylinder, a first variable-diameter drive connecting rod is slidably connected in the first variable-diameter drive receiving cylinder, and the plurality of first variable-diameter drive connecting rods are fixedly connected to each first variable-diameter guide vane in a one-to-one correspondence;

[0010] A plurality of second variable-diameter drive accommodating cylinders connected to the interior of the silencer flow channel are fixed on the inner side wall of the main body silencer inner cylinder, a second variable-diameter drive accommodating cylinder is slidably connected with a second variable-diameter drive connecting rod, and the plurality of second variable-diameter drive connecting rods are fixedly connected to each second variable-diameter guide blade one by one.

[0011] Preferably, an auxiliary muffler structure is provided in the muffler flow channel, and the auxiliary muffler structure includes a plurality of first auxiliary muffler pipes fixed on the inner side wall of the main muffler outer cylinder, and a plurality of second auxiliary muffler pipes fixed on the outer side wall of the main muffler inner cylinder.

[0012] Description: The auxiliary reduction structure can fine-tune the turbulence of the air flow in the channel, making the mutual cancellation effect of its own vibration frequencies more obvious.

[0013] Preferably, a vibration reduction mechanism is provided on the outer side wall of the main silencer outer cylinder, and the vibration reduction mechanism includes a plurality of vibration reduction containing boxes fixed on the outer side wall of the main silencer outer cylinder, and two vibration reduction plates parallel to each other are fixed in the vibration reduction containing boxes, and the vibration reduction plates are fixedly connected to the inner side wall of the vibration reduction containing boxes through a plurality of vibration reduction support springs.

[0014] Description: The vibration reduction mechanism can effectively buffer and reduce the additional vibration generated by the overall structure of the main silencer structure during operation.

[0015] Preferably, the middle section silencer structure comprises a middle section silencer outer cylinder, a middle section silencer support frame is fixed inside the middle section silencer outer cylinder, a middle section compensation mechanism is installed on the middle section silencer support frame, and the middle section compensation mechanism comprises a plurality of middle section compensation silencer plates installed on the middle section silencer support frame;

[0016] A plurality of middle-section compensation sound-absorbing panels surround together to form a sound-absorbing compensation adjustment ring.

[0017] Note: The main silencer structure cannot reduce noise in all frequency bands. First, use the main silencer structure to reduce noise in most frequency bands, and then use the middle silencer structure to further reduce the airflow vibration noise in the residual frequency band to achieve better noise reduction and silencing effect.

[0018] Preferably, a plurality of compensating adjustment slide rails extending radially along the middle section silencer outer cylinder are fixed on the middle section silencer support frame, a compensating adjustment slider is slidably connected to the compensating adjustment slide rail, a compensating adjustment support shaft is fixed on the top of the compensating adjustment slider, a compensating adjustment support ring is rotatably connected to the compensating adjustment support shaft, and the middle section compensation silencer plate is fixedly connected to the compensation adjustment support ring.

[0019] Description: The compensation adjustment rail and the compensation adjustment slider are used to adjust the radial synchronous movement of each middle section compensation silencer plate along the middle section silencer outer cylinder to adjust the relative distance between the silencer compensation adjustment ring and the inner wall of the middle section silencer outer cylinder, so as to cope with the noise in various frequency bands and reduce it.

[0020] Preferably, a middle section compensation adaptive structure is provided in the middle section silencer outer cylinder, and the middle section compensation adaptive structure includes a plurality of pairs of middle section adaptive adjustment plates;

[0021] A plurality of C-shaped adaptive adjustment support frames are fixed on the inner wall of the middle section silencer outer cylinder, and the inner side of the adaptive adjustment support frame is rotatably connected with an adaptive adjustment support shaft extending parallel to the axis of the middle section silencer outer cylinder, the middle section adaptive adjustment plate is fixedly connected to the adaptive adjustment support shaft, and the adaptive adjustment support shaft is driven to rotate by a servo motor.

[0022] Description: By adjusting the deflection of the middle section adaptive adjustment plate to adapt to the spacing adjustment between each middle section compensation silencer plate and the inner wall of the middle section silencer outer cylinder, the middle section compensation silencer plate and the inner wall of the middle section silencer outer cylinder always maintain a fixed spacing to avoid negative interference between various air circulation channels.

[0023] Preferably, the middle section adaptive adjustment plate has a hollow structure, a plurality of filling baffles are fixed inside the middle section adaptive adjustment plate, and a sound-absorbing filling chamber is formed between two adjacent filling baffles.

[0024] Preferably, the middle section compensating sound-absorbing plate has a hollow structure, and a plurality of resonant frequency adjusting filling shells are fixed on the inner side wall of the middle section compensating sound-absorbing plate.

[0025] Note: By filling different media into the resonant frequency adjustment filling shell and the sound-absorbing filling chamber, the sound-absorbing and noise-reducing effect of the overall structure can be fine-tuned.

[0026] Preferably, the tail end silencer structure comprises a tail end silencer receiving tube, in which a plurality of independent silencers are installed;

[0027] The independent silencer comprises an independent silencer outer cylinder, in which a first silencer baffle, a middle silencer baffle and a second silencer baffle are fixed in sequence from top to bottom, a first silencer chamber is formed between the first silencer baffle and the middle silencer baffle, and a second silencer chamber is formed between the second silencer baffle and the inner bottom of the independent silencer outer cylinder;

[0028] A silencer input pipe connected to the first silencer chamber is fixed at the bottom of the independent silencer outer cylinder, and the lower end of the silencer input pipe is connected to the interior of the middle silencer outer cylinder. A silencer output pipe connected to the second silencer chamber is fixed to the top of the independent silencer outer cylinder, and the first silencer chamber and the second silencer chamber are connected through an intermediate connecting pipe.

[0029] Description: The noise vibration wave is reflected back and forth between the inner wall of the first silencing chamber and the inner wall of the second silencing chamber. By using the vibration wave phase difference principle, the peak and trough of the noise can offset each other, thereby achieving noise reduction.

[0030] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0031] 1. The present invention has a reasonable structural design and has an efficient noise reduction function. It can effectively absorb, reflect and reduce isolation noise, and reduce the noise level generated when the fan is running and when the air is circulating;

[0032] 2. The design of the muffler box of the present invention takes into account the noise with different frequencies due to the difference in air flow rate, so the main muffler structure is designed as a variable duct structure, which can cope with noise in various complex situations;

[0033] 3. The overall use of the middle section silencer structure and the tail end silencer structure of the present invention can reduce the noise of the fan operation and air circulation to a very low level;

[0034] 4. In the structure of the present invention, by filling different media into the resonant frequency adjustment filling shell and the sound-absorbing filling chamber, the sound-absorbing and noise-reducing effect of the overall structure can be fine-tuned to achieve a better noise reduction processing purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a top view of the main muffler structure of the present invention;

[0037] Figure 3 is a top view of the vibration reduction mechanism of the present invention;

[0038] Figure 4 This is a front view of the middle section noise reduction structure of the present invention;

[0039] Figure 5 yes Figure 4 A top view of

[0040] Figure 6 yes Figure 4 A local enlarged schematic diagram of the middle A;

[0041] Figure 7 It is a schematic diagram of the cross-sectional structure of the middle section compensation sound-absorbing plate of the present invention;

[0042] Figure 8 This is a schematic diagram of the cross-sectional structure of the middle section adaptive adjustment plate of the present invention;

[0043] Fig. 9 is a top view of the tail end noise reduction structure of the present invention;

[0044] Fig.10 It is a structural schematic diagram of the independent silencer of the present invention;

[0045] Fig.11 yes Fig.10 Top view of the .

[0046] In the figure, 10-main silencer structure, 11-main silencer outer cylinder, 12-main silencer inner cylinder, 100-silencer flow channel, 13-duct variable diameter mechanism, 130-duct variable diameter guide ring, 131-first variable diameter guide blade, 132-second variable diameter guide blade, 133-first variable diameter drive accommodating cylinder, 134-first variable diameter drive connecting rod, 135-second variable diameter drive accommodating cylinder, 136-second variable diameter drive connecting rod, 137-first variable diameter drive rod, 138-second variable diameter drive rod, 14-auxiliary reduction structure, 141-first auxiliary silencer pipe, 142-second auxiliary silencer pipe, 15-vibration reduction mechanism, 151-vibration reduction accommodating box, 152-vibration reduction plate, 153-vibration reduction support spring, 20-middle section silencer structure, 21-middle section silencer outer cylinder, 211-middle section silencer support frame , 22-middle section compensation mechanism, 2201-silencer compensation adjustment ring, 220-middle section compensation silencer plate, 221-compensation adjustment slide rail, 222-compensation adjustment slider, 223-compensation adjustment support shaft, 224-compensation adjustment support ring, 23-middle section compensation adaptive structure, 231-middle section adaptive adjustment plate, 232-adaptive adjustment support frame, 233-adaptive adjustment support shaft, 241-filling partition, 242-silencer filling chamber, 30-tail end silencer structure, 31-tail end silencer accommodating tube, 32-independent silencer, 320-independent silencer outer tube, 321-first silencer partition, 322-middle silencer partition, 323-second silencer partition, 324-first silencer chamber, 325-second silencer chamber, 326-silencer input pipe, 327-silencer output pipe, 328-middle connecting pipe. DETAILED DESCRIPTION

[0047] Combine the following Figure 1-Figure 11 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are consistent with the up, down, left, right, front, and back directions of the projection relationship of the respective main views or structural schematic diagrams themselves.

[0048] Embodiment 1:

[0049] A variable ducted stainless steel silencer box for fan silencer, such as Figure 1 As shown, it includes a main body noise reduction structure 10, a middle section noise reduction structure 20 connected to the main body noise reduction structure 10, and a tail end noise reduction structure 30;

[0050] like Figure 2 As shown, the main body silencer structure 10 comprises a main body silencer outer cylinder 11 and a main body silencer inner cylinder 12 which are coaxially arranged. The main body silencer inner cylinder 12 is arranged inside the main body silencer outer cylinder 11, and a silencer flow channel 100 is formed between the outer side wall of the main body silencer inner cylinder 12 and the inner side wall of the main body silencer outer cylinder 11;

[0051] A duct variable diameter mechanism 13 is provided in the muffler circulation channel 100. The duct variable diameter mechanism 13 includes a plurality of first variable diameter guide blades 131 and second variable diameter guide blades 132. The first variable diameter guide blades 131 and the second variable diameter guide blades 132 together form an annular duct variable diameter guide ring 130.

[0052] A plurality of first variable-diameter drive receiving cylinders 133 connected to the interior of the muffler circulation channel 100 are fixed on the outer wall of the main muffler outer cylinder 11, and a first variable-diameter drive connecting rod 134 is slidably connected in the first variable-diameter drive receiving cylinder 133. The plurality of first variable-diameter drive connecting rods 134 are fixedly connected to each first variable-diameter guide vane 131 in a one-to-one correspondence;

[0053] A plurality of second variable-diameter drive receiving cylinders 135 connected to the interior of the muffler circulation channel 100 are fixed on the inner side wall of the main muffler inner cylinder 12, and a second variable-diameter drive connecting rod 136 is slidably connected in the second variable-diameter drive receiving cylinder 135. The plurality of second variable-diameter drive connecting rods 136 are fixedly connected to each second variable-diameter guide vane 132 in a one-to-one correspondence;

[0054] A first diameter-changing driving rod 137 for driving the first diameter-changing driving connecting rod 134 to slide is disposed in the first diameter-changing driving accommodating cylinder 133 , and a second diameter-changing driving rod 138 for driving the second diameter-changing driving connecting rod 136 to slide is disposed in the second diameter-changing driving accommodating cylinder 135 .

[0055] like Figure 4 As shown, the middle section silencer structure 20 includes a middle section silencer outer cylinder 21, a middle section silencer support frame 211 is fixed inside the middle section silencer outer cylinder 21, a middle section compensation mechanism 22 is installed on the middle section silencer support frame 211, and the middle section compensation mechanism 22 includes a plurality of middle section compensation silencer plates 220 installed on the middle section silencer support frame 211;

[0056] A plurality of middle-section compensating sound-absorbing plates 220 are surrounded together to form a sound-absorbing compensating adjusting ring 2201 .

[0057] like Fig. 9 As shown, the tail end silencer structure 30 includes a tail end silencer receiving tube 31, and a plurality of independent silencers 32 are installed in the tail end silencer receiving tube 31;

[0058] like Fig.10 As shown, the independent silencer 32 includes an independent silencer outer cylinder 320, in which a first silencer baffle 321, an intermediate silencer baffle 322, and a second silencer baffle 323 are fixed in sequence from top to bottom, a first silencer chamber 324 is formed between the first silencer baffle 321 and the intermediate silencer baffle 322, and a second silencer chamber 325 is formed between the second silencer baffle 323 and the inner bottom of the independent silencer outer cylinder 320;

[0059] A silencer input pipe 326 connected to the first silencer chamber 324 is fixed at the bottom of the independent silencer outer tube 320, and the lower end of the silencer input pipe 326 is connected to the interior of the middle silencer outer tube 21. A silencer output pipe 327 connected to the second silencer chamber 325 is fixed to the top of the independent silencer outer tube 320, and the first silencer chamber 324 and the second silencer chamber 325 are connected via an intermediate connecting pipe 328.

[0060] Embodiment 2:

[0061] On the basis of Example 1, Figure 2 As shown, an auxiliary muffler structure 14 is provided in the muffler flow channel 100, and the auxiliary muffler structure 14 includes a plurality of first auxiliary muffler pipes 141 fixed on the inner wall of the main muffler outer cylinder 11, and a plurality of second auxiliary muffler pipes 142 fixed on the outer wall of the main muffler inner cylinder 12.

[0062] Embodiment 3:

[0063] On the basis of Example 2, Figure 2 As shown, the outer wall of the main muffler outer cylinder 11 is provided with a vibration reduction mechanism 15, such as Figure 3 As shown, the vibration reduction mechanism 15 includes a plurality of vibration reduction containing boxes 151 fixed on the outer wall of the main silencer outer cylinder 11, and two parallel vibration reduction plates 152 are fixed in the vibration reduction containing boxes 151. The vibration reduction plates 152 are fixedly connected to the inner wall of the vibration reduction containing boxes 151 through a plurality of vibration reduction support springs 153.

[0064] Embodiment 4:

[0065] On the basis of Example 3, Figure 5 , Figure 6 As shown, a plurality of compensating adjustment rails 221 extending radially along the middle section silencer outer cylinder 21 are fixed on the middle section silencer support frame 211, and a compensating adjustment slider 222 is slidably connected to the compensating adjustment rail 221. The compensating adjustment slider 222 is driven by a servo motor to move along the compensating adjustment rail 221, and a compensating adjustment support shaft 223 is fixed on the top of the compensating adjustment slider 222. A compensating adjustment support ring 224 is rotatably connected to the compensating adjustment support shaft 223. The compensating adjustment support ring 224 is driven by a servo motor to rotate around the axis of the compensating adjustment support shaft 223, and the middle section compensation silencer plate 220 is fixedly connected to the compensation adjustment support ring 224.

[0066] Embodiment 5:

[0067] On the basis of Example 4, Figure 4 , Figure 5 As shown, a middle section compensation adaptive structure 23 is provided in the middle section silencer outer cylinder 21, and the middle section compensation adaptive structure 23 includes a plurality of pairs of middle section adaptive adjustment plates 231;

[0068] A plurality of C-shaped adaptive adjustment support frames 232 are fixed on the inner wall of the middle section silencer outer cylinder 21, and an adaptive adjustment support shaft 233 extending parallel to the axis of the middle section silencer outer cylinder 21 is rotatably connected to the inner side of the adaptive adjustment support frame 232, and the middle section adaptive adjustment plate 231 is fixedly connected to the adaptive adjustment support shaft 233, and the adaptive adjustment support shaft 233 is driven to rotate by a servo motor.

[0069] like Figure 8 As shown, the middle section adaptive adjustment plate 231 has a hollow structure, and a plurality of filling baffles 241 are fixed inside the middle section adaptive adjustment plate 231 . A silencer filling chamber 242 is formed between two adjacent filling baffles 241 , and the silencer filling chamber 242 is filled with pure water.

[0070] like Figure 7 As shown, the middle section compensating silencer plate 220 is a hollow structure, and a plurality of resonant frequency adjusting filling shells 229 are fixed on the inner side wall of the middle section compensating silencer plate 220 , and the resonant frequency adjusting filling shells 229 are filled with pure water.

[0071] Embodiment 6:

[0072] The difference from Example 5 is that the silencing filling chamber 242 is filled with 5.0 bar compressed air, and the resonance frequency adjustment filling shell 229 is filled with 5.0 bar compressed air.

[0073] Embodiment 7:

[0074] The difference from Example 5 is that the silencing filling chamber 242 is filled with 8.0 bar helium, and the resonance frequency adjustment filling shell 229 is filled with 8.0 bar helium.

[0075] Embodiment 8:

[0076] The difference from Example 5 is that the silencing filling chamber 242 is filled with 10.0 bar carbon dioxide gas, and the resonance frequency adjustment filling shell 229 is filled with 12.0 bar carbon dioxide gas.

[0077] In the actual application of the present invention, the fan conveys fresh air to the main muffler structure 10, and the fresh air enters the muffler circulation channel 100 from top to bottom. The flowing air is divided into two parts by the annular duct variable diameter guide ring 130. During the circulation of the two parts of air, the noise vibration will be reciprocated between the inner wall of the main muffler outer cylinder 11 and the duct variable diameter guide ring 130, and between the duct variable diameter guide ring 130 and the outer wall of the main muffler inner cylinder 12. The noise vibration separated in these two parts of the space will have a vibration effect on the first variable diameter guide blade 131 and the second variable diameter guide blade 132. The phase difference of the noise vibration in the two parts of the space is used to mutually reduce the vibration, thereby achieving the function of noise reduction and silencing.

[0078] The inner rod of the first variable-diameter driving rod 137 extends to drive the first variable-diameter driving connecting rod 134 together with the first variable-diameter guide vane 131 to extend radially along the main muffler outer cylinder 11, and the inner rod of the second variable-diameter driving rod 138 retracts to drive the second variable-diameter driving connecting rod 136 together with the second variable-diameter guide vane 132 to extend radially along the main muffler outer cylinder 11. The plurality of first variable-diameter guide vanes 131 and the plurality of second variable-diameter guide vanes 132 move synchronously to adjust the relative spacing ratio between the inner side wall of the main muffler outer cylinder 11 and the duct variable-diameter guide ring 130, and between the duct variable-diameter guide ring 130 and the outer side wall of the main muffler inner cylinder 12, thereby adjusting the overall noise reduction effect of the main muffler structure 10;

[0079] The flowing air is discharged from the upper end of the silencer flow channel 100 and enters the middle silencer outer cylinder 21. The air flows from the bottom to the top of the middle silencer outer cylinder 21, and the silencer compensation adjustment ring 2201 composed of a plurality of middle silencer compensation plates 220 is used to separate the flowing air into two parts, the inner and outer parts. The principle of vibration phase difference is also used to reduce the noise vibration.

[0080] The servo motor drives the compensation adjustment slider 222 to move along the compensation adjustment slide rail 221, and the compensation adjustment slider 222 drives the middle section compensation silencer plate 220 to move along the radial direction of the middle section silencer outer cylinder 21. The plurality of middle section compensation silencer plates 220 move synchronously along the radial direction of the middle section silencer outer cylinder 21 to adjust the relative distance between the silencer compensation adjustment ring 2201 and the inner side wall of the middle section silencer outer cylinder 21, thereby adjusting the overall noise reduction effect of the middle section silencer structure 20;

[0081] The flowing air is discharged from the upper end of the middle silencer outer cylinder 21 and enters the first silencer chamber 324 through the silencer input pipe 326. The air in the first silencer chamber 324 is then returned to the second silencer chamber 325 through the intermediate connecting pipe 328. The side walls of the first silencer chamber 324 and the second silencer chamber 325 are used to reflect the noise vibration waves back and forth, and the noise vibration is mutually reduced by using the vibration phase difference principle. Finally, the air in the second silencer chamber 325 is discharged through the silencer output pipe 327. The air discharged from the silencer output pipe 327 is then transported to each floor and each room through the ventilation duct.

Claims

1. A variable ducted stainless steel silencer box for fan silencing, characterized in that: It comprises a main body noise reduction structure (10), a middle section noise reduction structure (20) and a tail end noise reduction structure (30) connected to the main body noise reduction structure (10); The main body noise reduction structure (10) comprises a main body noise reduction outer cylinder (11) and a main body noise reduction inner cylinder (12) which are coaxially arranged, and a noise reduction circulation channel (100) is formed between the outer side wall of the main body noise reduction inner cylinder (12) and the inner side wall of the main body noise reduction outer cylinder (11); A duct variable diameter mechanism (13) is provided in the muffler circulation channel (100), the duct variable diameter mechanism (13) comprising a plurality of first variable diameter guide blades (131) and second variable diameter guide blades (132), the first variable diameter guide blades (131) and the second variable diameter guide blades (132) together forming an annular duct variable diameter guide ring (130); A plurality of first variable-diameter drive accommodating cylinders (133) connected to the interior of the silencing circulation channel (100) are fixed on the outer side wall of the main body silencer outer cylinder (11); a first variable-diameter drive accommodating cylinder (133) is slidably connected to the interior of the first variable-diameter drive accommodating cylinder (133); and the plurality of first variable-diameter drive connecting rods (134) are fixedly connected to each of the first variable-diameter guide vanes (131) in a one-to-one correspondence; A plurality of second variable-diameter drive accommodating cylinders (135) connected to the interior of the muffler circulation channel (100) are fixed on the inner side wall of the main body muffler inner cylinder (12); a second variable-diameter drive connecting rod (136) is slidably connected inside the second variable-diameter drive accommodating cylinder (135); and the plurality of second variable-diameter drive connecting rods (136) are fixedly connected to each of the second variable-diameter guide vanes (132) in a one-to-one correspondence; The middle section silencer structure (20) comprises a middle section silencer outer cylinder (21), a middle section silencer support frame (211) is fixed inside the middle section silencer outer cylinder (21), a middle section compensation mechanism (22) is installed on the middle section silencer support frame (211), and the middle section compensation mechanism (22) comprises a plurality of middle section compensation silencer plates (220) installed on the middle section silencer support frame (211); The plurality of middle section compensating sound-absorbing plates (220) are arranged together to form a sound-absorbing compensating adjusting ring (2201).

2. A variable ducted stainless steel silencer box for fan silencer according to claim 1, characterized in that: An auxiliary sound-reducing structure (14) is provided in the sound-reducing circulation channel (100), and the auxiliary sound-reducing structure (14) comprises a plurality of first auxiliary sound-reducing pipes (141) fixed on the inner wall of the main sound-reducing outer cylinder (11), and a plurality of second auxiliary sound-reducing pipes (142) fixed on the outer wall of the main sound-reducing inner cylinder (12).

3. A variable ducted stainless steel silencer box for fan silencer according to claim 1, characterized in that: The outer wall of the main body silencer outer cylinder (11) is provided with a vibration reduction mechanism (15), and the vibration reduction mechanism (15) comprises a plurality of vibration reduction accommodating boxes (151) fixed on the outer wall of the main body silencer outer cylinder (11), and two mutually parallel vibration reduction plates (152) are fixed in the vibration reduction accommodating boxes (151), and the vibration reduction plates (152) are fixedly connected to the inner wall of the vibration reduction accommodating boxes (151) via a plurality of vibration reduction support springs (153).

4. A variable ducted stainless steel silencer box for fan silencer according to claim 1, characterized in that: A plurality of compensating adjustment slide rails (221) extending radially along the middle section muffler outer cylinder (21) are fixed on the middle section muffler support frame (211); a compensating adjustment slider (222) is slidably connected to the compensating adjustment slide rail (221); a compensating adjustment support shaft (223) is fixed to the top of the compensating adjustment slider (222); a compensating adjustment support ring (224) is rotatably connected to the compensating adjustment support shaft (223); and the middle section compensating muffler plate (220) is fixedly connected to the compensating adjustment support ring (224).

5. The variable ducted stainless steel silencer box for fan silencer according to claim 1, characterized in that: A middle section compensating adaptive structure (23) is provided inside the middle section muffler outer cylinder (21), and the middle section compensating adaptive structure (23) comprises a plurality of pairs of middle section adaptive adjusting plates (231); A plurality of C-shaped adaptive adjustment support frames (232) are fixed on the inner side wall of the middle section silencer outer cylinder (21); an adaptive adjustment support shaft (233) extending parallel to the axis of the middle section silencer outer cylinder (21) is rotatably connected to the inner side of the adaptive adjustment support frame (232); the middle section adaptive adjustment plate (231) is fixedly connected to the adaptive adjustment support shaft (233); and the adaptive adjustment support shaft (233) is driven to rotate by a servo motor.

6. A variable ducted stainless steel silencer box for fan silencer according to claim 5, characterized in that: The middle section adaptive adjustment plate (231) has a hollow structure. A plurality of filling partitions (241) are fixed inside the middle section adaptive adjustment plate (231), and a sound-absorbing filling chamber (242) is formed between two adjacent filling partitions (241).

7. A variable ducted stainless steel silencer box for fan silencer according to claim 1, characterized in that: The middle section compensating sound-absorbing plate (220) has a hollow structure inside, and a plurality of resonant frequency adjusting filling shells (229) are fixed on the inner side wall of the middle section compensating sound-absorbing plate (220).

8. The variable ducted stainless steel silencer box for fan silencer according to claim 1, characterized in that: The tail end silencer structure (30) comprises a tail end silencer accommodating tube (31), wherein a plurality of independent silencers (32) are installed in the tail end silencer accommodating tube (31); The independent silencer (32) comprises an independent silencer outer cylinder (320), wherein a first silencer baffle (321), an intermediate silencer baffle (322) and a second silencer baffle (323) are fixed in sequence from top to bottom in the independent silencer outer cylinder (320), a first silencer chamber (324) is formed between the first silencer baffle (321) and the intermediate silencer baffle (322), and a second silencer chamber (325) is formed between the second silencer baffle (323) and the inner bottom of the independent silencer outer cylinder (320); A silencer input pipe (326) connected to the first silencer chamber (324) is fixed at the bottom of the independent silencer outer tube (320), and the lower end of the silencer input pipe (326) is connected to the interior of the middle silencer outer tube (21). A silencer output pipe (327) connected to the second silencer chamber (325) is fixed at the top of the independent silencer outer tube (320), and the first silencer chamber (324) and the second silencer chamber (325) are connected via an intermediate connecting pipe (328).

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