Silencer for a fluidized bed dryer

Abstract

The application discloses a kind of sound attenuation device for boiling dryer, including silencer shell, the bottom and top outer wall are respectively provided with first, second mounting edge and bolt hole, first, second, third sound attenuation component are sequentially assembled in shell from bottom to top.Silencer shell is divided into four sections, first sound attenuation part is formed adjustable annular channel by first bushing, first sound attenuation pipe, first sleeve and first spring, second sound attenuation part is provided with sound attenuation passage and sound attenuation cotton, third sound attenuation part is realized dynamic cross-sectional area adjustment by second bushing, second sound attenuation pipe, second sleeve, expansion plate and second spring.The device can effectively reduce the noise of boiling dryer through the frequency self-adaptive adjustment of multi-stage sound attenuation structure, and the sound attenuation volume is greater than or equal to 25dB (A) under rated operating condition, and is suitable for-20℃-120℃ environment.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, specifically to a silencer device for a boiling dryer. Background Technology

[0002] A fluidized bed dryer is a device that uses fluidization technology to dry materials. It gets its name from the "boiling" state of the material particles in the hot airflow during operation. Fluidized bed dryers are widely used in industrial production, but the noise they generate during operation has long been a problem. Existing noise reduction devices simply use a single silencer pipe, resulting in poor noise reduction performance. Utility Model Content

[0003] To address the aforementioned technical problems, this application solves the problem that existing silencing devices simply use a single silencing pipe for silencing, resulting in poor silencing performance.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a silencing device for a boiling dryer, comprising a silencing housing (10), wherein a first mounting edge is provided on the outer peripheral wall of the bottom of the silencing housing (10), and a plurality of first bolt holes (401) are provided on the first mounting edge and are arranged at equal intervals along the circumferential direction; a second mounting edge is provided on the outer peripheral wall of the top of the silencing housing (10), and a plurality of second bolt holes (501) are provided on the second mounting edge and are arranged at equal intervals along the circumferential direction;

[0005] The muffler housing (10) is equipped with a first muffler component, a second muffler component and a third muffler component in sequence from bottom to top.

[0006] To better realize this utility model, the muffler housing (10) is further divided into four sections from bottom to top, namely the first section housing, the second section housing, the third section housing and the fourth section housing;

[0007] The first silencing component includes a first bushing (101), which is fixedly sleeved on the inner peripheral wall of the first section housing. A first mounting hole is provided at the middle position of the first bushing (101), and a first silencing tube (102) is fixedly sleeved in the first mounting hole. The end of the first silencing tube (102) extending toward the top of the muffler housing (10) is placed in the second section housing. A first sleeve (103) with one end closed and the other end open is suspended outside the first bushing (101) in the direction inside the first silencing tube (102), so that a uniform first annular channel is formed between the outer peripheral wall of the first silencing tube (102) and the inner peripheral wall of the first sleeve (103).

[0008] A first limiting part (104) is provided on the outer peripheral wall surface at both ends of the first sleeve (103). A first guide sleeve (105) is sleeved on the outer peripheral wall surface of the first sleeve (103) between the two first limiting parts (104). The outer peripheral wall surface of the first guide sleeve (105) is fixedly connected to the inner peripheral wall surface of the second section of the housing by multiple first fixing rods (106). The center position of the end face of the first sleeve (103) near the top of the muffler housing (10) is fixedly connected to the center position of the second muffler part by a first spring (107).

[0009] To better realize this utility model, further, when the first spring (107) is in the maximum compression state, the first limiting part (104) near the bottom of the muffler housing (10) is in contact with the annular end face of the first guide sleeve (105) near the bottom of the muffler housing (10), and the end of the first muffler tube (102) facing the top of the muffler housing (10) is located at half the distance from the closed end of the first sleeve (103) to the open end (based on the closed end of the first sleeve (103));

[0010] When the first spring (107) is in its natural state, the first limiting part (104) near the top of the muffler housing (10) is in contact with the annular end face of the first guide sleeve (105) near the top of the muffler housing (10), and the end of the first muffler tube (102) facing the top of the muffler housing (10) is located at one-third of the distance from the closed end of the first sleeve (103) to the open end (based on the closed end of the first sleeve (103)).

[0011] To better realize this utility model, the second silencing part further includes a second silencing part (201), the outer peripheral wall of the second silencing part (201) is fixedly connected to the inner peripheral wall of the second section shell, a plurality of silencing channels (202) are axially opened on the end face of the second silencing part (201) and are evenly arranged in the circumferential direction, and a sound-absorbing cotton (203) is provided on the inner peripheral wall of each silencing channel (202), and the center position of the end face of the first sleeve (103) near the second silencing part is fixedly connected to the center position of the end face of the second silencing part (201) near the first silencing component by a first spring (107), and the projections of the first spring (107) and the silencing channel (202) in the axial direction do not coincide.

[0012] To better realize this utility model, the third silencing part further includes a second bushing (301), the second bushing (301) is fixedly sleeved on the inner peripheral wall of the fourth section housing, a second mounting hole is provided at the middle position of the second bushing (301), a second silencing tube (302) is fixedly sleeved in the second mounting hole, the end of the second silencing tube (302) extending toward the bottom of the muffler housing (10) is placed in the third section housing, and a second sleeve (303) with one end closed and the other end open is suspended outside the second bushing (301) in the direction of the inner side of the second silencing tube (302), so that a uniform second annular channel is formed between the outer peripheral wall of the second silencing tube (302) and the inner peripheral wall of the second sleeve (303);

[0013] An extension plate (304) is provided on the outer peripheral wall of the end of the second sleeve (303) away from the second silencing part. Multiple through holes (305) are equally spaced along the circumferential direction on the surface of the extension plate (304). The outer peripheral wall of the extension plate (304) is in contact with the inner peripheral wall of the third housing section and can slide axially. A second limiting part (310) is provided on the outer peripheral wall of the other end of the second sleeve (303) near the second silencing part. The second sleeve (303) is located in the... A second guide sleeve (306) is fitted on the outer peripheral wall between the extension plate (304) and the second limiting part (310). The outer peripheral wall of the second guide sleeve (306) is fixedly connected to the inner peripheral wall of the third section housing by multiple second fixing rods (307). The center position of the end face of the second sleeve (303) near the bottom of the muffler housing (10) is fixedly connected to the center position of the end face of the second muffler part (201) near the third muffler part by a second spring (308).

[0014] The through hole (305) and the silencing channel (202) near the third silencing part are connected to each other through the guide tube (309), and the upper middle section of each of the second fixing rods (307) is fixedly connected to the outer peripheral wall of one of the guide tubes (309). The projections of the second spring (308) and the guide tube (309) in the axial direction do not coincide.

[0015] To better realize this utility model, further, when the second spring (308) is in the maximum compression state, the extension plate (304) near the top of the muffler housing (10) is in contact with the annular end face of the second guide sleeve (306) near the top of the muffler housing (10), and the end of the second muffler tube (302) facing the bottom of the muffler housing (10) is located at half the position of the closed end of the second sleeve (303) towards the open end;

[0016] When the second spring (308) is in its natural state, the second limiting part (310) near the bottom of the muffler housing (10) is in contact with the annular end face of the second guide sleeve (306) near the bottom of the muffler housing (10), and the end of the second muffler tube (302) facing the bottom of the muffler housing (10) is located at one-third of the distance from the closed end of the second sleeve (303) to the open end.

[0017] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0018] 1. In this invention, the first and third silencing parts are dynamically adaptable to low-frequency (100-500Hz) and mid-to-high-frequency (500-3000Hz) noise by adjusting the length and cross-sectional area of ​​the annular channel driven by a spring. For example, when the compression state of the first spring changes, the position of the end of the first silencing tube inside the first sleeve is adjusted from 1 / 3 to 1 / 2, the channel length changes, and the absorption switching from low frequency to mid-to-high frequency is realized.

[0019] 2. In this invention, the spring elastic structure can automatically adjust the position of the silencing component according to equipment vibration or airflow pressure, without manual intervention. For example, the second spring drives the expansion plate to slide, so that the cross-sectional area of ​​the second annular channel is dynamically optimized according to airflow fluctuations, ensuring a stable silencing effect.

[0020] 3. In this utility model, the first silencing part uses sound wave reflection and interference to silencing, the second silencing part utilizes the damping dissipation of the silencing channel (with built-in silencing cotton), and the third silencing part combines the reflection of the annular channel with multi-stage silencing through the resonant hole to form a "reflection-absorption-resonance" synergistic effect. Under rated operating conditions, the total silencing volume is ≥25dB(A), and the mid-to-high frequency noise reduction is ≥20dB.

[0021] 4. In this utility model, the first spring and the axial projection of the silencing channel do not coincide, and the guide tube is coupled to the second fixed rod, which forces the sound wave to turn multiple times, increases the number of reflections, and further loses sound energy.

[0022] 5. In this utility model, the segmented design of the shell (four-section shell) can be connected by flanges, and the bolt holes are evenly distributed around the circumference, which is convenient for disassembly and assembly; each noise reduction component is modularly assembled, and damaged components (such as noise reduction cotton and springs) can be replaced independently, reducing maintenance costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 for Figure 1 Sectional view at point AA;

[0026] Figure 3 for Figure 1 Sectional view at point BB;

[0027] Figure 4 for Figure 1 Top view;

[0028] Figure 5 for Figure 4 Sectional view at CC;

[0029] Figure 6 A schematic diagram showing the coordination of the first, second, and third noise reduction sections;

[0030] Figure 7 This is a schematic diagram of the structure of the first muffler;

[0031] Figure 8 for Figure 7 The front view;

[0032] Figure 9 for Figure 8 Sectional view at point DD;

[0033] Figure 10 This is a schematic diagram of the second silencing section;

[0034] Figure 11 Schematic diagram of the third muffler section Figure 1 ;

[0035] Figure 12 for Figure 11 Top view;

[0036] Figure 13 for Figure 12 Sectional view at EE;

[0037] Figure 14 Schematic diagram of the third muffler section Figure 2 .

[0038] Explanation of reference numerals in the attached drawings: 10-Silencer housing; 101-First bushing; 102-First silencer tube; 103-First sleeve; 104-First limiting part; 105-First guide sleeve; 106-First fixing rod; 107-First spring; 201-Second silencer part; 202-Silencer channel; 203-Silencer cotton; 301-Second bushing; 302-Second silencer tube; 303-Second sleeve; 304-Extension plate; 305-Through hole; 306-Second guide sleeve; 307-Second fixing rod; 308-Second spring; 309-Guide tube; 310-Second limiting part; 401-First bolt hole; 501-Second bolt hole. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0040] Example 1

[0041] like Figures 1 to 14 As shown, a silencing device for a boiling dryer includes a silencing housing 10. The outer peripheral wall of the bottom of the silencing housing 10 is provided with a first mounting edge, and a plurality of 401s are provided on the first mounting edge and are arranged at equal intervals along the circumferential direction. The outer peripheral wall of the top of the silencing housing 10 is provided with a second mounting edge, and a plurality of 501s are provided on the second mounting edge and are arranged at equal intervals along the circumferential direction.

[0042] The muffler housing 10 is equipped with a first muffler component, a second muffler component, and a third muffler component in sequence from bottom to top.

[0043] like Figures 1 to 14 As shown, in this embodiment, the muffler housing 10 is divided into four sections from bottom to top: the first section housing, the second section housing, the third section housing, and the fourth section housing.

[0044] The first silencing part includes a first bushing 101, which is fixedly sleeved on the inner peripheral wall of the first section housing. A first mounting hole is provided at the middle position of the first bushing 101. A first silencing tube 102 is fixedly sleeved in the first mounting hole. The end of the first silencing tube 102 extending toward the top of the muffler housing 10 is placed in the second section housing. A first sleeve 103, which is closed at one end and open at the other end, is suspended outside the first silencing tube 102 in the direction of the inner side of the first bushing 101, so that a uniform first annular channel is formed between the outer peripheral wall of the first silencing tube 102 and the inner peripheral wall of the first sleeve 103.

[0045] A first limiting part 104 is provided on the outer peripheral wall surface at both ends of the first sleeve 103. A first guide sleeve 105 is sleeved on the outer peripheral wall surface of the first sleeve 103 between the two first limiting parts 104. The outer peripheral wall surface of the first guide sleeve 105 is fixedly connected to the inner peripheral wall surface of the second section of the housing by multiple first fixing rods 106. The center position of the end face of the first sleeve 103 near the top of the muffler housing 10 is fixedly connected to the center position of the second muffler part by a first spring 107.

[0046] like Figures 1 to 14 As shown, in this embodiment, when the first spring 107 is in the maximum compression state, the first limiting part 104 near the bottom of the muffler housing 10 is in contact with the annular end face of the first guide sleeve 105 near the bottom of the muffler housing 10, and the end of the first muffler tube 102 facing the top of the muffler housing 10 is located at half the distance from the closed end of the first sleeve 103 to the open end (based on the closed end of the first sleeve 103).

[0047] When the first spring 107 is in its natural state, the first limiting portion 104 near the top of the muffler housing 10 is in contact with the annular end face of the first guide sleeve 105 near the top of the muffler housing 10, and the end of the first muffler tube 102 facing the top of the muffler housing 10 is located at one-third of the distance from the closed end of the first sleeve 103 to the open end (based on the closed end of the first sleeve 103).

[0048] like Figures 1 to 14 As shown, in this embodiment, the second silencing part includes a second silencing part 201. The outer peripheral wall of the second silencing part 201 is fixedly connected to the inner peripheral wall of the second segment shell. Multiple silencing channels 202 are axially opened on the end face of the second silencing part 201 and are evenly arranged in the circumferential direction. A sound-absorbing cotton 203 is provided on the inner peripheral wall of each silencing channel 202. The center position of the end face of the first sleeve 103 near the second silencing part and the center position of the end face of the second silencing part 201 near the first silencing part are fixedly connected by a first spring 107. The projections of the first spring 107 and the silencing channel 202 in the axial direction do not coincide.

[0049] like Figures 1 to 14As shown, in this embodiment, the third silencing part includes a second bushing 301, which is fixedly sleeved on the inner peripheral wall of the fourth section housing. A second mounting hole is provided at the middle position of the second bushing 301, and a second silencing tube 302 is fixedly sleeved in the second mounting hole. The end of the second silencing tube 302 extending toward the bottom of the muffler housing 10 is placed inside the third section housing. A second sleeve 303, which is closed at one end and open at the other end, is suspended outside the second silencing tube 302 in the direction of the inner side of the second bushing 301, so that a uniform second annular channel is formed between the outer peripheral wall of the second silencing tube 302 and the inner peripheral wall of the second sleeve 303.

[0050] An expansion plate 304 is provided on the outer peripheral wall of the end of the second sleeve 303 away from the second muffler. The surface of the expansion plate 304 has a plurality of through holes 305 arranged at equal intervals along the circumferential direction. The outer peripheral wall of the expansion plate 304 is in contact with the inner peripheral wall of the third section housing and can slide axially. A second limiting part 310 is provided on the outer peripheral wall of the other end of the second sleeve 303 near the second muffler. A second guide sleeve 306 is sleeved on the outer peripheral wall of the second sleeve 303 between the expansion plate 304 and the second limiting part 310. The outer peripheral wall of the second guide sleeve 306 is fixedly connected to the inner peripheral wall of the third section housing by a plurality of second fixing rods 307. The center position of the end face of the second sleeve 303 near the bottom of the muffler housing 10 is fixedly connected to the center position of the end face of the second muffler 201 near the third muffler by a second spring 308.

[0051] The through hole 305 and the silencing channel 202 near the third silencing part are connected to each other through the guide tube 309 (metal or PVC material). The upper middle section of each of the second fixing rods 307 is fixedly connected to the outer peripheral wall of one of the guide tubes 309 (metal or PVC material). The projections of the second spring 308 and the guide tube 309 (metal or PVC material) in the axial direction do not coincide.

[0052] like Figures 1 to 14 As shown, in this embodiment, when the second spring 308 is in the maximum compression state, the extension plate 304 near the top of the muffler housing 10 is in contact with the annular end face of the second guide sleeve 306 near the top of the muffler housing 10, and the end of the second muffler tube 302 facing the bottom of the muffler housing 10 is located at half the distance from the closed end of the second sleeve 303 to the open end (based on the closed end of the second sleeve 303).

[0053] When the second spring 308 is in its natural state, the second limiting part 310 near the bottom of the muffler housing 10 is in contact with the annular end face of the second guide sleeve 306 near the bottom of the muffler housing 10, and the end of the second muffler tube 302 facing the bottom of the muffler housing 10 is located at one-third of the distance from the closed end of the second sleeve 303 to the open end (based on the closed end of the second sleeve 303).

[0054] Working principle:

[0055] In use, the bottom inlet of the muffler housing 10 is bolted to the output port of the existing boiling dryer.

[0056] I. The silencing principle of the first silencing section

[0057] 1. Structural Composition

[0058] Core components: First bushing 101 (fixed to the inner wall of the first section of the housing), first silencer tube 102 (a pipe passing through the first mounting hole), first sleeve 103 (a sleeve with one end closed, forming a first annular channel with the first silencer tube 102), and first spring 107 (an elastic connector).

[0059] Key structure: The first annular channel between the first silencer tube 102 and the first sleeve 103 is used to guide the propagation of sound waves. The elastic connection of the first spring 107 allows the first sleeve 103 to move axially, changing the channel size.

[0060] 2. Noise reduction mechanism

[0061] Sound wave reflection and interference: After the sound wave enters the first silencer tube 102 from the boiling dryer, it enters the first annular channel. Since one end of the first sleeve 103 is closed, the sound wave is reflected at the closed end, interfering with the incident wave and canceling out part of the sound energy. Frequency adaptive adjustment: The change in the compression state of the first spring 107 (natural state / maximum compression) changes the position of the end of the first silencer tube 102 within the first sleeve 103: Natural state: The end of the first silencer tube 102 is located at 1 / 3 of the distance from the closed end to the open end of the first sleeve 103, with a longer channel length, suitable for absorbing low-frequency sound waves. Maximum compression state: The end of the first silencer tube 102 is located at 1 / 2 of the distance, with a shorter channel length, which can be adjusted to absorb mid-to-high frequency sound waves. This dynamic adjustment allows the first silencer section to adapt to noise frequencies under different operating conditions.

[0062] II. The silencing principle of the second silencing section

[0063] 1. Structural Composition

[0064] Core components: Second silencing part 201 (fixed to the inner wall of the second section of the shell), silencing channel 202 (through holes evenly distributed axially), and silencing cotton 203 (the inner wall structure of the hole, which is a damping layer).

[0065] Key structure: The first spring 107 connects the first silencing part and the second silencing part, transmitting vibration and adjusting position.

[0066] 2. Noise reduction mechanism

[0067] Silencing: Each silencing channel 202 converts sound wave energy into heat energy.

[0068] Damping dissipation: The sound-absorbing cotton 203 is a sound-absorbing material (such as porous fiber or damping layer). When sound waves pass through, they rub against the material, further dissipating energy. Sound wave path interference: The axial projection of the first spring 107 and the sound-absorbing channel 202 does not coincide, avoiding the propagation of sound waves in a straight line and also avoiding interference between the parts. The path offset enhances reflection and scattering, reducing noise intensity.

[0069] III. The silencing principle of the third silencing section

[0070] 1. Structural Composition

[0071] Core components: second bushing 301 (fixed to the inner wall of the fourth section housing), second silencer pipe 302 (pipe that passes through the second mounting hole), second sleeve 303 (sleeve with one end closed, forming a second annular channel with the second silencer pipe 302), extension plate 304 (an axially sliding ring), and second spring 308 (elastic connector).

[0072] Key structure: The second annular channel between the second silencer tube 302 and the second sleeve 303, the cross-sectional area of ​​which can be changed when the expansion plate 304 slides. The through hole 305 (the through hole on the surface of the expansion plate 304) is connected to the silencer channel 202 through the guide tube 309 (metal material or PVC material), forming a sound wave transmission path.

[0073] 2. Noise reduction mechanism

[0074] Multi-stage reflection and interference: Sound waves enter the second annular channel from the second silencer tube 302, are reflected at the closed end of the second sleeve 303, and simultaneously enter the silencer channel 202 of the second silencer part through the through hole 305 and the guide tube 309 (metal or PVC material), forming a multi-stage silencer structure of "annular channel + resonant hole," with multiple reflections consuming sound energy. Dynamic cross-sectional area adjustment: The elastic state (natural state / maximum compression) of the second spring 308 affects the position of the extension plate 304: Natural state: The end of the second silencer tube 302 is located at 1 / 3 of the distance between the closed end and the open end of the second sleeve 303, with a smaller channel cross-sectional area, suitable for mid-to-high frequency silencer. Maximum compression state: The end is located at 1 / 2 of the distance, with an increased channel cross-sectional area, suitable for low-frequency sound waves. Sliding sealing design (the sealing ring on the outer periphery of the extension plate 304) ensures airtightness during adjustment, preventing sound wave leakage. Structural coupling noise reduction: The second fixed rod 307 (the rod that fixes the second guide sleeve 306) is fixedly connected to the guide tube 309 (metal material or PVC material) (connecting tube). When the sound wave propagates, it drives the structure to vibrate, and the energy is further dissipated through mechanical damping, thereby enhancing the noise reduction effect.

[0075] IV. Synergistic Effect of Three Mufflers

[0076] Complementary Frequency Coverage: The first and third silencing sections handle broadband noise through an adjustable annular channel, while the second silencing section absorbs specific frequencies through a resonant aperture, forming a composite mechanism of "broadband attenuation + narrowband noise reduction." Dynamic Adaptive Adjustment: The elastic structure of the first spring 107 and the second spring 308 allows the silencing sections to automatically adjust channel parameters according to equipment vibration or changes in operating conditions, optimizing the silencing effect in real time. Complex Sound Wave Path: Through channel offset, multi-level connectivity, and structural coupling, each silencing section causes multiple turns in the sound wave propagation path, increasing the number of reflections and interferences, and minimizing noise intensity.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A silencer for a boiling dryer, characterized in that: The muffler housing (10) includes a first mounting edge on the outer peripheral wall of the bottom of the muffler housing (10), and a plurality of first bolt holes (401) arranged at equal intervals along the circumferential direction are provided on the first mounting edge. The muffler housing (10) includes a second mounting edge on the outer peripheral wall of the top, and a plurality of second bolt holes (501) arranged at equal intervals along the circumferential direction are provided on the second mounting edge. The muffler housing (10) is equipped with a first muffler component, a second muffler component and a third muffler component from bottom to top.

2. The silencing device for a boiling dryer according to claim 1, characterized in that: The muffler housing (10) is divided into four sections from bottom to top, namely the first section housing, the second section housing, the third section housing and the fourth section housing; The first silencing component includes a first bushing (101), which is fixedly sleeved on the inner peripheral wall of the first section housing. A first mounting hole is provided at the middle position of the first bushing (101), and a first silencing tube (102) is fixedly sleeved in the first mounting hole. The end of the first silencing tube (102) extending toward the top of the muffler housing (10) is placed in the second section housing. A first sleeve (103) with one end closed and the other end open is suspended outside the first bushing (101) in the direction inside the first silencing tube (102), so that a uniform first annular channel is formed between the outer peripheral wall of the first silencing tube (102) and the inner peripheral wall of the first sleeve (103). A first limiting part (104) is provided on the outer peripheral wall surface at both ends of the first sleeve (103). A first guide sleeve (105) is sleeved on the outer peripheral wall surface of the first sleeve (103) between the two first limiting parts (104). The outer peripheral wall surface of the first guide sleeve (105) is fixedly connected to the inner peripheral wall surface of the second section of the housing by multiple first fixing rods (106). The center position of the end face of the first sleeve (103) near the top of the muffler housing (10) is fixedly connected to the center position of the second muffler part by a first spring (107).

3. The silencing device for a boiling dryer according to claim 2, characterized in that: When the first spring (107) is in the maximum compression state, the first limiting part (104) near the bottom of the muffler housing (10) is in contact with the annular end face of the first guide sleeve (105) near the bottom of the muffler housing (10), and the end of the first muffler tube (102) facing the top of the muffler housing (10) is located at half the distance from the closed end of the first sleeve (103) to the open end. When the first spring (107) is in its natural state, the first limiting part (104) near the top of the muffler housing (10) is in contact with the annular end face of the first guide sleeve (105) near the top of the muffler housing (10), and the end of the first muffler tube (102) facing the top of the muffler housing (10) is located at one-third of the distance from the closed end of the first sleeve (103) to the open end.

4. The silencing device for a boiling dryer according to claim 3, characterized in that: The second silencing part includes a second silencing part (201). The outer peripheral wall of the second silencing part (201) is fixedly connected to the inner peripheral wall of the second section of the shell. Multiple silencing channels (202) are axially opened on the end face of the second silencing part (201) and are evenly arranged in the circumferential direction. A sound-absorbing cotton (203) is provided on the inner peripheral wall of each silencing channel (202). The center position of the end face of the first sleeve (103) near the second silencing part is fixedly connected to the center position of the end face of the second silencing part (201) near the first silencing component by a first spring (107). The projections of the first spring (107) and the silencing channel (202) in the axial direction do not coincide.

5. A silencer for a boiling dryer according to claim 4, characterized in that: The third silencing part includes a second bushing (301), which is fixedly sleeved on the inner peripheral wall of the fourth section housing. A second mounting hole is provided at the middle position of the second bushing (301), and a second silencing tube (302) is fixedly sleeved in the second mounting hole. The end of the second silencing tube (302) extending toward the bottom of the muffler housing (10) is placed in the third section housing. A second sleeve (303) with one end closed and the other end open is suspended outside the second bushing (301) in the direction inside the second silencing tube (302), so that a uniform second annular channel is formed between the outer peripheral wall of the second silencing tube (302) and the inner peripheral wall of the second sleeve (303). An extension plate (304) is provided on the outer peripheral wall of the end of the second sleeve (303) away from the second silencing part. Multiple through holes (305) are equally spaced along the circumferential direction on the surface of the extension plate (304). The outer peripheral wall of the extension plate (304) is in contact with the inner peripheral wall of the third housing section and can slide axially. A second limiting part (310) is provided on the outer peripheral wall of the other end of the second sleeve (303) near the second silencing part. The second sleeve (303) is located in the... A second guide sleeve (306) is fitted on the outer peripheral wall between the extension plate (304) and the second limiting part (310). The outer peripheral wall of the second guide sleeve (306) is fixedly connected to the inner peripheral wall of the third section housing by multiple second fixing rods (307). The center position of the end face of the second sleeve (303) near the bottom of the muffler housing (10) is fixedly connected to the center position of the end face of the second muffler part (201) near the third muffler part by a second spring (308). The through hole (305) and the silencing channel (202) near the third silencing part are connected to each other through the guide tube (309), and the upper middle section of each of the second fixing rods (307) is fixedly connected to the outer peripheral wall of one of the guide tubes (309). The projections of the second spring (308) and the guide tube (309) in the axial direction do not coincide.

6. A silencer for a boiling dryer according to claim 5, characterized in that: When the second spring (308) is in the maximum compression state, the extension plate (304) near the top of the muffler housing (10) is in contact with the annular end face of the second guide sleeve (306) near the top of the muffler housing (10), and the end of the second muffler tube (302) facing the bottom of the muffler housing (10) is located at half the distance from the closed end of the second sleeve (303) to the open end. When the second spring (308) is in its natural state, the second limiting part (310) near the bottom of the muffler housing (10) is in contact with the annular end face of the second guide sleeve (306) near the bottom of the muffler housing (10), and the end of the second muffler tube (302) facing the bottom of the muffler housing (10) is located at one-third of the distance from the closed end of the second sleeve (303) to the open end.

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