Cabinet type air inlet channel silencer

Abstract

The invention discloses a cabinet-type air inlet duct silencer, which belongs to the technical field of noise control and is used for being installed in the air inlet duct of a cabinet body, and comprises a fixing bracket, a silencer unit and a mounting bracket, wherein the fixing bracket fixes the silencer unit side by side in the mounting bracket, and the mounting bracket is installed as a whole in the air inlet duct; the silencer unit is a composite structure formed by a sound absorbing layer, a protective surface layer and a perforated plate, and a guide channel is arranged at the air inlet end of the silencer unit; the invention has a simple structure, is easy to manufacture, and is convenient to maintain and install, and can be used in air inlet ducts of cabinets of various types and models, and can effectively eliminate aerodynamic noise of the cabinet air inlet, mechanical noise radiated by a casing and bearings, and noise radiated by basic vibration.

Description

Technical Field

[0001] The invention relates to the technical field of noise control, and in particular to a cabinet-type air inlet channel silencer. Background Art

[0002] Cabinet-type high-speed centrifugal fans, compressors, and air compressors are widely used in the pharmaceutical, environmental protection, chemical, petroleum and other industries. The cabinet structure is compact, easy to install, and highly integrated. At the same time, the cabinet structure can isolate the radiation noise of the machine body to a certain extent. However, the air intake channel ensures the entry of airflow, and the aerodynamic noise radiation is large, which makes the machine body noise large. The noise energy value is high in the medium and high frequency bands, causing people to be irritable and have abnormal pulse and heart. The existing cabinet-type air inlet channel noise radiation energy level is high, and the existing air inlet channel silencer adopts a complex sound insulation board structure, which seriously affects the flow of airflow, and the air inlet area is large, and the air inlet silencer cannot be designed, and the conventional silencer measures seriously affect the appearance and space of the cabinet. Summary of the invention

[0003] Technical purpose: In view of the shortcomings of the prior art in the silencer of the cabinet-type air inlet duct, the present invention discloses a cabinet-type air inlet duct silencer with simple structure, good silencer effect and easy disassembly.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A cabinet-type air inlet duct silencer is installed at the entrance of the air inlet duct of a cabinet, and comprises silencer units installed side by side, a fixing bracket and a mounting frame for fixing the silencer units; the silencer unit adopts a symmetrical structure, comprising a sound absorption layer located in the center, a protective layer on both sides of the sound absorption layer, a first perforated plate and a second perforated plate outside the protective layer, a first cavity layer is formed between the first perforated plate and the protective layer, a second cavity layer is formed between the first perforated plate and the second perforated plate, a silencer channel is formed between the second perforated plates of adjacent silencer units, and a guide channel for guiding gas to enter is arranged at the end of the silencer channel; the combination of the two layers of perforated plates effectively broadens the sound absorption frequency, the silencer frequency band is wide, and it is well adapted to wide-band noise of fans, air compressors, compressors, etc.

[0006] The air inlet direction of the guide channel is perpendicular to the guide channel and is fixed at the end of the silencer channel; the guide channel is composed of two arc-shaped guide vanes, including a first arc-shaped guide vane and a second arc-shaped guide vane; the two arc-shaped guide vanes are respectively fixed at the ends of the second perforated plates of adjacent silencer units; the arc-shaped guide vanes optimize the inlet flow conditions, reduce airflow turbulence, and effectively reduce the regeneration noise of the airflow; the air intake direction is perpendicular to the guide channel, so that the sound waves are bent, thereby improving the silencer effect of medium and high frequencies; an airfoil-shaped guide vane is arranged inside the guide channel, which divides the entrance position of the guide channel into two channels with the same path width, so that the air intake is smoother and the airflow noise is reduced from the inlet.

[0007] The silencer unit is fixed inside the mounting frame by a fixing bracket. The fixing bracket adopts a groove structure and is fixed at the upper and lower ends of the silencer unit. The fixing bracket is detachably connected to the silencer unit, and the bottom of the fixing bracket is fixedly connected to the mounting frame. The mounting frame is integrally installed in the air inlet channel of the cabinet. The silencer unit is modularly arranged, which is convenient for overall disassembly and assembly and partial maintenance, saving costs.

[0008] Preferably, the first arc-shaped guide plate includes two arc structures, namely a first arc segment and a second arc segment. The first arc segment is convex along the guide channel, and the second arc segment is concave along the guide channel. One end transitions with the arc of the first arc segment, and the other end is fixedly connected to the silencer unit; the shape of the second arc-shaped guide plate adopts a concave arc along the guide channel.

[0009] Preferably, the airfoil guide vane is in an arc shape, including a first spacer and a second spacer fitted at both ends, wherein the arc radius of the first spacer is smaller than that of the second spacer, and the first spacer is located in the guide channel on the side close to the first arc-shaped guide vane. The cross-sectional path of the guide channel changes continuously, thereby reducing airflow resistance, not affecting the intake efficiency, making the intake more evenly distributed, and controlling the intake noise from the source.

[0010] Preferably, the air inlet distance of the guide channel is 25~100mm, the distance at the narrowest position is 10~50mm, the arc radius of the first arc segment is 20~50mm, the radius of the second arc segment is 10~50mm, and the arc radius of the second arc guide plate is 15~45mm.

[0011] Preferably, the maximum hollow distance of the airfoil guide vane is 10-20 mm, the arc radius of the first spacer is 5-30 mm, the arc radius of the second spacer is 10-35 mm, and the arc height of the first spacer is 5-15 mm.

[0012] Preferably, the outer surface of the mounting frame is made of elastic material and fits tightly with the inner surface of the cabinet to prevent gas from entering the cabinet through the fitting gap and affecting the sound-absorbing effect.

[0013] Preferably, the sound absorbing layer is made of ultra-fine glass wool or polyurethane foam, preferably ultra-fine glass wool, with a thickness of 20-150 mm and a bulk density of 20 kg / m 3 ~50 kg / m 3 , moisture content 0.2%~3%, mass moisture absorption rate 2%~8%, hydrophobicity not less than 98%; and appropriate flow resistance, uniform pores, high sound absorption performance and chemical stability.

[0014] Preferably, the protective layer is made of one of glass fiber cloth, non-woven fabric or film, preferably glass fiber cloth; the first perforated plate and the second perforated plate are made of aluminum alloy or galvanized plate, preferably galvanized plate, with a pore size of 0.1~10mm, a hole spacing of 1~30mm, a perforated plate thickness of 0.2~5mm, and a perforation rate of 5%~40%. The use of perforated plates and protective layers will improve the medium and low frequency sound absorption coefficients, forming a composite sound absorption structure, which effectively absorbs the low-frequency pulsating noise of the intake air.

[0015] Preferably, the thickness of the first cavity layer is 10-80 mm, the thickness of the second cavity layer is 5-100 mm, and the double-layer cavity is set up to broaden the silencing frequency band by utilizing airflow resonance, effectively adapting to the silencing of various cabinet fans.

[0016] When the present invention is used, silencer units of appropriate size and quantity are installed according to the shape of the cabinet to form an air intake silencer device, which is fixed in the air intake channel of the cabinet. The airflow enters the silencer channel through the guide channel, and after being silenced by the silencer unit, it enters the interior of the cabinet.

[0017] Beneficial effects: The present invention optimizes the gas flow conditions and further reduces the airflow regeneration noise through the guide channel formed by the arc-shaped guide plate; the double-layer cavity setting widens the silencing frequency band, which is well adapted to the wide-band noise of fans, air compressors, compressors, etc., and has a wide range of applications; the perforated plate, the surface layer and the sound absorption layer constitute a composite sound absorption structure, which effectively eliminates noise in the low, medium and high frequency bands, the silencing frequency band is wide, and the high-frequency failure frequency of the silencing channel is high; the modular design can be disassembled as a whole or partially replaced, which is easy to operate and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 A three-dimensional diagram of the present invention installed in a cabinet-type air inlet duct;

[0020] Figure 2 It is a top sectional view of the present invention installed in a cabinet-type air inlet channel;

[0021] Figure 3A three-dimensional diagram of a muffler unit of the present invention;

[0022] Figure 4 It is a partial enlarged view of the muffler unit of the present invention;

[0023] Figure 5 is a plan view of the perforated plate of the present invention;

[0024] Figure 6 This is an enlarged view of the diversion channel of the present invention;

[0025] Among them, 1-cabinet, 2-fixed bracket, 3-silencer unit, 4-guide channel, 5-mounting frame, 6-silencer channel, 7-wing-shaped guide vane; 301-sound absorption layer, 302-protection layer, 303-first cavity layer, 304-first perforated plate, 305-second perforated plate, 306-second cavity layer, 401-first arc-shaped guide vane, 402-second arc-shaped guide vane, 403-first arc segment, 404-second arc segment, 701-first spacer, 702-second spacer. DETAILED DESCRIPTION

[0026] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0027] like Figure 1 , Figure 2 The figure shows a cabinet-type air inlet duct silencer device provided by the present invention, which is installed in the air inlet duct of the cabinet 1, and includes a fixed bracket 2, a silencer unit 3 and a mounting frame 5. The silencer units 3 are fixed side by side in the mounting frame 5 through the fixed bracket 2, and a silencer channel 6 is formed between adjacent silencer units 3. A guide channel 4 for guiding the gas to enter is arranged at the end of the silencer channel 6. The outer surface of the mounting frame 5 is made of elastic material and is tightly fitted with the inner surface of the cabinet 1, so that the airflow enters the cabinet only through the silencer channel 6. The mounting frame 5 allows the silencer device to be disassembled and installed as a whole for easy maintenance.

[0028] The fixed bracket 2 adopts a groove structure and is located at the upper and lower ends of the silencer unit 3. The bottom is fixedly connected to the mounting bracket 5. The silencer unit 3 is stuck between the two fixed brackets 2 through the mounting groove of the fixed bracket 2, which is easy to replace and maintain, saving maintenance costs.

[0029] like Figure 2 , Figure 6 As shown, the guide channel 4 is composed of a first arc-shaped guide vane 401 and a second arc-shaped guide vane 402 on the outside, the air intake direction of the guide channel 4 is perpendicular to the channel direction of the guide channel 4, the inlet path width is 25~100mm, and an airfoil guide vane 7 for separation is arranged inside the guide channel 4.

[0030] The first arc-shaped guide plate 401 includes two arc structures, namely a first arc segment 403 and a second arc segment 404. The first arc segment 403 is convex along the guide channel 4, and the arc radius is 20~50mm. The second arc segment 404 is concave along the guide channel 4, one end of which is in transition with the first arc segment 403, and the other end is fixedly connected to the silencer unit 3, and the arc radius is 15~35mm; the second arc-shaped guide plate 402 is in the shape of an arc concave along the guide channel 4, and the arc radius is 15~45mm.

[0031] The airfoil guide vane 7 adopts an arc-shaped hollow structure, including a first spacer 701 and a second spacer 702 fitted at both ends, wherein the arc radius of the first spacer 701 is smaller than that of the second spacer 702, and the first spacer 701 is located in the guide channel 4 close to the first arc-shaped guide vane 401. The maximum hollow distance of the airfoil guide vane is 10-20 mm, the arc radius of the first spacer is 5-30 mm, the arc radius of the second spacer is 10-35 mm, and the arc height of the first spacer is 5-15 mm.

[0032] like Figure 3 , Figure 4 As shown, the sound-absorbing unit 3 is a symmetrical structure, including a sound-absorbing layer 301, a protective layer 302 and a double-layer perforated plate. The protective layer 302 is located on both sides of the sound-absorbing layer 301 and is used to compress the sound-absorbing layer 301; the double-layer perforated plates are located on both sides of the protective layer 302, and are the first perforated plate 304 and the second perforated plate 305 from the inside to the outside. The double-layer perforated plates effectively broaden the sound absorption frequency and the sound-absorbing frequency bandwidth, and are well adapted to wide-band noises such as fans, air compressors, and compressors.

[0033] The sound absorbing layer 301 is made of ultra-fine glass wool or polyurethane foam plastic, preferably ultra-fine glass wool, with a thickness of 20-150 mm, a bulk density of 20 kg / m3-50 kg / m3, a moisture content of 0.2%-3%, a mass moisture absorption rate of 2%-8%, and a hydrophobicity of not less than 98%.

[0034] The protective layer 302 is made of one of glass fiber cloth, non-woven fabric or film. A first cavity layer 303 is formed between the first perforated plate 304 and the protective layer 302, and the thickness of the first cavity layer 303 is 10~80mm; a second cavity layer 306 is formed between the first perforated plate 304 and the second perforated plate 305, and the thickness of the second cavity layer 306 is 5~100mm.

[0035] like Figure 5 As shown, the first perforated plate 304 and the second perforated plate 305 are made of materials including but not limited to aluminum alloy or galvanized plate, preferably galvanized plate, with a hole diameter of 0.1 mm to 10 mm, a hole spacing of 1 mm to 30 mm, a plate thickness of 0.2 mm to 5 mm, preferably 0.3 mm, and a perforation rate of 5% to 40%.

[0036] A cabinet-type air inlet duct silencer device provided by the present invention is integrally installed in the air inlet duct of a cabinet 1 through a mounting frame 5, the outer surface of the mounting frame 5 is in contact with the air inlet duct, the gas enters the silencer duct 6 through the guide channel 4 formed by the arc-shaped guide plate 401, and the intake air is noise-reduced and silenced by the silencer units 3 on both sides of the silencer duct 6, and finally the gas enters the interior of the cabinet.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cabinet-type air inlet duct silencer, fixed at the inlet duct entrance of a cabinet body (1), characterized in that: It comprises a silencer unit (3), a fixing bracket (2) and a mounting bracket (5); the silencer unit (3) is fixed inside the mounting bracket (5) via the fixing bracket (2), and the mounting bracket (5) is fixed as a whole at the entrance of the air inlet passage of the cabinet body (1); A silencer channel (6) is formed between adjacent silencer units (3), and a guide channel (4) for guiding gas to enter is provided at the end of the silencer channel (6); The guide channel (4) is composed of a first arc-shaped guide vane (401) and a second arc-shaped guide vane (402) on the outside, the air intake direction of the guide channel (4) is perpendicular to the channel direction of the guide channel (4), and an airfoil-shaped guide vane (7) for separation is arranged inside the guide channel (4); The first arc-shaped guide plate (401) comprises two arc structures, namely a first arc segment (403) and a second arc segment (404); the first arc segment (403) is convex along the guide channel (4), the second arc segment (404) is concave along the guide channel (4), one end of the first arc segment (403) is in transition with the arc, and the other end is fixedly connected to the muffler unit (3); the second arc-shaped guide plate (402) is in the shape of a concave arc along the guide channel (4); The airfoil guide plate (7) is in an arc shape, and comprises a first spacer (701) and a second spacer (702) attached at both ends, wherein the arc radius of the first spacer (701) is smaller than that of the second spacer (702), and the first spacer (701) is located in the guide channel (4) on a side close to the first arc-shaped guide plate (401); The muffler unit (3) has a symmetrical structure, comprising a central sound absorbing layer (301), a protective layer (302) located on both sides of the sound absorbing layer (301) and used to compress the sound absorbing layer (301), and a first perforated plate (304) and a second perforated plate (305) located on the outermost sides of the muffler unit (3); a first cavity layer (303) is formed between the first perforated plate (304) and the protective layer (302); and a second cavity layer (306) is formed between the first perforated plate (304) and the second perforated plate (305).

2. A cabinet-type air inlet channel silencer according to claim 1, characterized in that: The muffler units (3) are installed side by side inside the mounting frame (5); the fixed bracket (2) adopts a groove structure and is installed at the upper and lower ends of the muffler unit (3); the bottom of the fixed bracket (2) is fixedly connected to the mounting frame (5).

3. A cabinet-type air inlet duct silencer according to claim 2, characterized in that: The sound absorbing layer (301) is made of ultra-fine glass wool or polyurethane foam plastic, with a thickness of 20 mm to 150 mm, a moisture content of 0.2% to 3%, and a bulk density of 20 kg / m 3 ~50kg / m 3 , mass moisture absorption rate is 2%~8%, and hydrophobicity is greater than or equal to 98%.

4. A cabinet-type air inlet duct silencer according to claim 2, characterized in that: The protective surface layer (302) is made of one of glass fiber cloth, non-woven fabric, and film; the first cavity layer (303) has a thickness of 10 to 80 mm; and the second cavity layer (306) has a thickness of 5 to 100 mm.

5. The cabinet-type air inlet channel silencer according to claim 2, characterized in that: The first perforated plate (304) and the second perforated plate (305) are made of aluminum alloy or galvanized plate, with a hole diameter of 0.1-10 mm, a hole spacing of 1-30 mm, and a perforation rate of 5%-40%.

6. The cabinet-type air inlet duct silencer according to claim 1, characterized in that: The outer surface of the mounting frame (5) is made of elastic material.

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