Impedance composite silencer and array silencer

Abstract

The present invention discloses an impedance composite silencer and an array silencer, wherein the impedance composite silencer comprises a shell, which is a hollow column surrounded by side panels, including a first end and a second end, and the outer circumferential size of the cross section from the first end to the second end gradually decreases; a skeleton, which is located in the accommodating space of the shell, and the skeleton divides the accommodating space into chambers distributed along the circumference of the shell and independent of each other; wherein the chambers include a reactive silencer cavity and a resistive silencer cavity, and the reactive silencer cavity and the resistive silencer cavity are distributed at intervals; and a sound-absorbing material, which is filled in the resistive silencer cavity. The present invention increases the effective silencer area, increases the sound attenuation amount, has good aerodynamic performance, has energy-saving effect, and the gradual change of the flow cross section can effectively suppress high-frequency failure phenomenon.

Description

Technical Field

[0001] The present invention relates to the technical field of noise control, and in particular to an impedance composite silencer and an array silencer. Background Art

[0002] In the field of noise control engineering of large ventilation systems such as coal mines, mining, central air conditioning, and air compressor rooms, sheet-type and honeycomb-type silencer structures are often used. The two sides corresponding to the silencer channel are in a parallel state. Due to the limitations of the silencer flow area and engineering cost, the sheet body cannot be too thick, resulting in high-frequency failure and poor low-frequency silencer effect. At the same time, there are defects such as poor aerodynamic performance, large resistance loss, and high energy consumption. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the problems of high-frequency failure and poor low-frequency noise reduction effect of the above-mentioned existing impedance composite noise reduction bodies, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide an impedance composite silencer and an array silencer.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an impedance composite silencing body, the impedance composite silencing body comprising:

[0007] The housing is in a hollow columnar shape surrounded by side panels, including a first end and a second end, and the outer circumference of the cross section from the first end to the second end gradually decreases; and,

[0008] A frame, located in the accommodation space of the shell, the frame divides the accommodation space into chambers that are distributed along the circumference of the shell and are independent of each other;

[0009] Wherein, the chamber includes a reactive anechoic chamber and a resistive anechoic chamber, and the reactive anechoic chamber and the resistive anechoic chamber are distributed at intervals; and,

[0010] The sound absorbing material is filled in the resistive silencing cavity.

[0011] Preferably, the housing is surrounded by a plurality of side panels;

[0012] Wherein, the cross section of the shell is a regular polygon.

[0013] Preferably, the frame includes partitions distributed along the circumference of the shell, and two adjacent partitions are respectively connected to two sides of the same side plate;

[0014] Wherein, the chamber is formed between two adjacent partitions.

[0015] Preferably, the side plate comprises a first side plate and a second side plate, and the first side plate and the second side plate are sequentially arranged along the circumferential direction;

[0016] Wherein, the first side plate is a micro-perforated plate, and the second side plate is a perforated plate;

[0017] Among them, the resistant muffler cavity is formed between the two partitions connected to the two sides of the first side plate; and the resistive muffler cavity is formed between the two partitions connected to the two sides of the second side plate.

[0018] Preferably, the skeleton further comprises a central tube located at the axis of the shell;

[0019] Wherein, the partitions are all fixedly connected to the central tube.

[0020] Preferably, there are two second ends, the first end is located between the two second ends, and the outer circumference of the cross section from the first end to the second ends on both sides gradually decreases;

[0021] The outer circumferential dimensions of the cross sections of the two second ends are the same.

[0022] Preferably, the skeleton further comprises a central partition, which is located at the first end and perpendicular to the central tube;

[0023] Wherein, the partitions are symmetrically arranged about the central partition;

[0024] Wherein, the chambers on both sides of the central partition are independent of each other;

[0025] Wherein, the first side panels and the second side panels on both sides of the central partition are arranged alternately.

[0026] An array type muffler, comprising:

[0027] Framework; and,

[0028] A muffler unit, wherein the muffler unit is arranged in an array in a muffler chamber of the frame;

[0029] Wherein, the muffler unit is formed by connecting any of the above-mentioned impedance composite mufflers in the length direction;

[0030] Wherein, the outer peripheral dimension of the cross section of the muffler unit changes continuously in the length direction.

[0031] As a preferred solution of the impedance composite silencer of the present invention, the impedance composite silencers of two adjacent silencer units are arranged opposite to each other or staggered.

[0032] Beneficial effects of the present invention:

[0033] (1) Compared with the known ordinary sound-absorbing structure, the present invention improves the sound-absorbing efficiency and broadens the sound-absorbing frequency band.

[0034] (2) The cross-section of the impedance composite muffler of the present invention changes gradually from small to large and from large to small, which reduces ventilation resistance, has good aerodynamic performance, reduces energy consumption of power equipment, and has an energy-saving effect.

[0035] (3) The muffler formed by the impedance composite muffler array of the present invention has a gradual and alternating flow cross-section, which can effectively suppress high-frequency failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0037] Figure 1 This is a schematic diagram of the structure of the impedance composite silencer described in Example 1 of the present invention.

[0038] Figure 2 It is a schematic diagram of the structure of the shell in Example 2 of the present invention.

[0039] Figure 3 for Figure 2 Exploded diagram.

[0040] Figure 4 Schematic diagram of the distribution of reactive anechoic chambers and resistive anechoic chambers in Example 1 of the present invention.

[0041] Figure 5 It is a schematic structural diagram of the resistant muffler formed by a triangular pyramid according to the present invention.

[0042] Figure 6 It is a schematic structural diagram of the resistant muffler formed by an octagonal pyramid according to the present invention.

[0043] Figure 7 This is a schematic diagram of the structure of the skeleton in Example 3 of the present invention.

[0044] Figure 8 for Figure 7 Exploded diagram.

[0045] Fig. 9This is a schematic diagram of the overall structure of the array silencer described in Example 4 of the present invention.

[0046] Fig.10 This is an exploded view of the silencer unit described in Example 5 of the present invention.

[0047] Fig.11 This is a schematic diagram of the structure of the first connecting member in Example 5 of the present invention.

[0048] Fig.12 for Fig.11 Enlarged view of point A in the middle.

[0049] Fig.13 This is a schematic diagram of the structure of the second connecting member in Example 5 of the present invention.

[0050] Fig.14 This is a schematic diagram of the structure of the impedance composite silencer described in Example 6 of the present invention.

[0051] Fig.15 for Fig.14 Exploded view of the housing described in .

[0052] Fig.16 for Fig.14 Schematic diagram of the structure of the skeleton described in .

[0053] Fig.17 This is an exploded view of the silencer unit described in Example 7 of the present invention.

[0054] Fig.18 Schematic diagram of the array of the silencer units described in Example 7 of the present invention.

[0055] Fig.19 Schematic diagram of the array of the silencer units described in Example 8 of the present invention.

[0056] Fig. 20 It is a comparison chart of the sound attenuation of Example 7, Example 8 and a common plate-type silencer.

[0057] Fig.21 Schematic diagram of the shell dimensions of the impedance composite silencer described in Example 9.

[0058] Fig. 22 It is a comparison chart of the sound attenuation of Example 9, Comparative Test Example P1 and Comparative Test Example P2.

[0059] Fig.23 It is a comparison chart of the resistance loss between Example 9 and Comparative Test Examples P1 and P2.

[0060] Fig.24 This is a schematic diagram of the structure of the impedance composite silencer described in Example 10 of the present invention.

[0061] Fig.25 This is a schematic diagram of the structure of the skeleton described in Example 10 of the present invention. DETAILED DESCRIPTION

[0062] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0063] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0064] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0065] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0066] Example 1

[0067] Reference Figures 1 to 4 , provides a schematic diagram of the overall structure of an impedance composite muffler, the impedance composite muffler 100 includes a shell 101, a frame 102 and a sound absorbing material 103;

[0068] The housing 101 is a hollow column surrounded by the side plate 101a, including a first end 101-1 and a second end 101-2 located in the length direction of the housing 101. The outer circumference of the cross section from the first end 101-1 to the second end 101-2 gradually decreases, that is, the housing 101 as a whole has a cross-sectional change along the length direction, such as Figure 1 As shown, in this embodiment, the housing 101 is in a frustum shape, which increases the chance of sound waves contacting the surface of the housing 101 and increases the effective sound-absorbing area;

[0069] The skeleton 102 is located in the accommodation space N1 of the shell 101, and the skeleton 102 divides the accommodation space N1 into chambers distributed along the circumference of the shell 101 and independent of each other; wherein the chambers include a reactive silencing chamber N2 and a resistive silencing chamber N3, the reactive silencing chamber N2 and the resistive silencing chamber N3 are sequentially arranged along the circumference of the shell 101, and the sound absorbing material 103 is filled in the resistive silencing chamber N3;

[0070] The sound absorbing material 103 is wrapped by sound-permeable glass cloth, sound-absorbing felt or other sound-permeable fabrics. The sound absorbing material can be made of centrifugal ultrafine glass wool, slag wool, wood fiber, polystyrene, polyvinyl chloride, polyurethane foam, urea-formaldehyde foam, phenolic foam and other materials.

[0071] The reactive silencing chamber N2 and the resistive silencing chamber N3 are arranged in an alternating manner. The reactive silencing chamber N2 forms a reactive silencing unit to absorb low and medium frequency narrowband noise. The resistive silencing chamber N3 and the sound-absorbing material 103 filled therein constitute a resistive silencing unit to absorb medium and high frequency broadband noise. By combining the reactive silencing unit and the resistive silencing unit into a whole, the synergistic effect of the two is brought into play. After the combination, the silencing frequency band is wider and the sound attenuation amount is greater.

[0072] Example 2

[0073] Reference Figures 1 to 4 This embodiment is different from the first embodiment in that: the shell 101 is surrounded by a plurality of side panels 101a; and the cross section of the shell 101 is a regular polygon.

[0074] In this embodiment, see Figure 4 The cross section of the shell 101 is a regular hexagon, and is surrounded by six side panels 101a. The shape of the side panels 101a is trapezoidal. The side edges of the side panels 101a are welded or riveted to each other to form a hexagonal pyramid, that is, the structure of the shell 101 of this embodiment, which is easy to install.

[0075] Of course, it can also be a structure with other regular polygonal cross-sections, such as Figure 5 As shown, it is an impedance composite muffler 100 formed by a triangular pyramid; Figure 6 As shown, an impedance composite silencer 100 is formed of an octagonal pyramid; in order to further improve the silencer effect and optimize the aerodynamic performance, under the premise of having certain processing capabilities and manufacturing processes, technical personnel in this field can adopt an impedance composite silencer 100 structure formed by an arbitrary regular polygon in cross section.

[0076] Among them, the side length a of the cross section of the first end 101-1 is 100~500mm, and the side length b of the cross section of the second end 101-2 is 30~100mm. The purpose of using the side length b of 30~100mm is to prepare the scale for the connection between the impedance composite silencers. If the side length b is too small, the connection strength is insufficient. If the side length b is too large, it will affect the size and layout of the silencer.

[0077] Example 3

[0078] Reference Figure 7 , 8 , this embodiment is different from the above embodiments in that: the skeleton 102 includes a partition 102a and a central tube 102b;

[0079] The central tube 102b is located at the axis of the shell 101, and six partitions 102a are evenly distributed along the circumference of the central tube 102b. The partitions 102a are in a right-angled trapezoid. The partitions 102a are welded and fixed to the central tube 102b. The partitions 102a and the central tube 102b are made of metal, fiberglass or PVC with a certain strength. The thickness of the partitions 102a is 1 to 3 mm.

[0080] Two adjacent partitions 102a are respectively connected to the two sides of the same side plate 101a to form a triangular pyramid-shaped cavity, that is, a chamber is formed between two adjacent partitions 102a, with a total of six chambers of the same size. At the same time, due to the separation effect of the partitions 102a, the chambers are independent of each other.

[0081] The side plate 101a includes a first side plate 101a-1 and a second side plate 101a-2. The first side plate 101a-1 and the second side plate 101a-2 are both isosceles trapezoids. The first side plate 101a-1 and the second side plate 101a-2 are sequentially arranged along the circumferential direction.

[0082] The first side plate 101a-1 is a micro-perforated plate, which is made of metal, fiberglass or PVC with a certain strength. The thickness of the first side plate 101a-1 is ≤1mm, the diameter of the perforations of the first side plate 101a-1 is ≤1mm, and the perforation rate of the first side plate 101a-1 is ≤5%;

[0083] The second side plate 101a-2 is a perforated plate; the perforated plate is made of metal, fiberglass or PVC with a certain strength. The thickness of the second side plate 101a-2 is 1 to 3 mm, and the perforation rate of the second side plate 101a-2 is 20% to 30%.

[0084] At this time, a resistive muffler cavity N2 is formed between the two partitions 102a connected to both sides of the first side plate 101a-1; and a resistive muffler cavity N3 is formed between the two partitions 102a connected to both sides of the second side plate 101a-2.

[0085] See also Figure 5 If the number of sides of the polygon is an odd number, then there must be two adjacent side panels 101a that are the same first side panel 101a-1 or the same second side panel 101a-2. Therefore, the present invention preferably has an even number of sides of the polygon, which can ensure that the first side panel 101a-1 and the second side panel 101a-2 are spaced apart to improve the sound insulation effect.

[0086] Example 4

[0087] Reference Fig. 9 , this embodiment discloses an array type muffler, including a frame 200 and a muffler unit 300;

[0088] The silencer units 300 are arranged in an array in the silencer chamber N4 of the frame 200; if there is an existing air duct, the silencer units 300 are arrayed in the air duct; if used at both ends of the ventilation duct, that is, when there is no air duct, the frame 200 is made of materials such as steel plates and angle steels to form an independent silencer.

[0089] The support members 201 are arranged parallel to each other at both ends of the frame 200, and the support members 201 are arranged along the array direction of the silencer unit 300. The two ends of the silencer unit 300 are respectively fixed on the support members 201. In this embodiment, the support members 201 are made of angle steel, and the impedance composite silencers 100 at both ends are fixedly connected to the support members 201 by riveting or self-tapping screws.

[0090] The muffler unit 300 is formed by connecting any of the above-mentioned impedance composite mufflers 100 in the length direction; wherein the outer peripheral size of the cross section of the muffler unit 300 changes continuously in the length direction, that is, referring to Fig. 9 The first end 101-1 of the impedance composite silencer 100 is connected to the first end 101-1 of another impedance composite silencer 100, and the second end 101-2 of the impedance composite silencer 100 is connected to the second end 101-2 of another impedance composite silencer 100, so that a silencer unit 300 can be formed in which the outer peripheral dimension of the cross section continuously changes in the length direction. The outer peripheral dimension of the cross section of the silencer unit 300 is a gradual shape from small to large and from large to small in the length direction, which reduces the ventilation resistance, has good aerodynamic performance, reduces the energy consumption of power equipment, and has an energy-saving effect.

[0091] Example 5

[0092] Reference Figures 10 to 13 , this embodiment is different from the above embodiment in that: the first ends 101 - 1 of the two impedance composite mufflers 100 are connected by a first connector 301 ; the second ends 101 - 2 of the two impedance composite mufflers 100 are connected by a second connector 302 ;

[0093] Reference Fig.11 , 12 The first connecting member 301 includes a supporting member 301a and a limiting member 301b. The supporting body 301a is in the shape of a plate. When the above-mentioned impedance composite muffler 100 is used, the supporting body 301a is a regular hexagonal plate; the limiting member 301b is attached to the surface of the supporting body 301a, and the limiting members 301b on the two side surfaces of the supporting body 301a are symmetrically distributed. The limiting member 301b is in the shape of a strip, and the limiting member 301b extends radially around the supporting body 301a and is distributed around the central axis of the supporting body 301a, wherein the limiting members 301b on the surface of one side of the supporting body 301a are twice the number of the partitions 102a, that is, twelve, and a space that can accommodate the partition 102a is formed between the two limiting members 301b. 02a, a total of six gaps N5 are formed, the partition 102a forms a receiving cavity N6 capable of accommodating the central tube 102b at the center of the support member 301a, and the gap N5 is connected to the receiving cavity N6. During installation, the first connecting member 301 is close to the first end 101-1 of the impedance composite silencer 100, and the partition 102a is made to enter the gap N5, and the end of the central tube 102b enters the receiving cavity N6, so that the chambers formed between the two partitions 102a are independent of each other, and then the end of the side plate 101a is welded to the support body 301a, and the above installation process is repeated to fix another impedance composite silencer 100 on the first connecting member 301;

[0094] Reference Fig.13 The second connecting member 302 includes a barrier 302a, a first connecting plate 302b and a second connecting plate 302c. The barrier 302a is in the shape of a plate. When the impedance composite muffler 100 is used, the barrier 302a is a regular hexagonal plate. The first connecting plate 302b and the second connecting plate 302c are sequentially arranged along the edge contour of the barrier 302a. The first connecting plate 302b and the second connecting plate 302c are distributed on both sides of the barrier 302a. The first connecting plate 302b and the second connecting plate 302c form an installation cavity N7. When installing, the second end 1 of the impedance composite muffler 100 is 01-2 is inserted into the installation cavity N7; the number of the first connecting plates 302b corresponds to the number of the first side plates 101a-1, and the first connecting plates 302b are provided with connecting holes corresponding to the through holes on the first side plates 101a-1, and the first connecting plates 302b are fixed to the first side plates 101a-1 by riveting; the number of the second connecting plates 302c corresponds to the number of the second side plates 101a-2, and the second connecting plates 302c are provided with connecting holes corresponding to the through holes on the second side plates 101a-2, and the second connecting plates 302c are fixed to the second side plates 101a-2 by riveting.

[0095] Example 6

[0096] Reference Figures 14 to 16This embodiment is different from the above embodiments in that: there are two second ends 101-2, the first end 101-1 is located between the two second ends 101-2, and the outer peripheral dimensions of the cross-section from the first end 101-1 to the second ends 101-2 on both sides gradually decrease; wherein the outer peripheral dimensions of the cross-sections of the two second ends 101-2 are the same.

[0097] Reference Fig.14 , that is, the impedance composite muffler 100 of this embodiment is in the shape of a hexagonal double pyramid, that is, two embodiments 1 are welded and fixed together, which can improve the installation efficiency.

[0098] Among them, refer to Fig.16 The skeleton 102 further includes a central partition 102c, which is located at the first end 101-1 and perpendicular to the central tube 102b; a hole with a diameter of 4 to 10 mm is made in the center of the central partition 102c by using a hole opener, and the central tube 102b is installed and fixed in the hole, and the central tube 102b is perpendicular to the central partition 102c. The central tubes 102b on both sides of the central partition 102c have the same length, and there are twelve partitions 102a symmetrically arranged about the central partition 102c; the chambers on both sides of the central partition 102c are independent of each other;

[0099] Furthermore, the first side plate 101a-1 and the second side plate 101a-2 on both sides of the central partition 102c are staggered, that is, the reactive sound-absorbing chamber N2 and the resistive sound-absorbing chamber N3 on both sides of the central partition 102c are staggered, and the sound waves continuously pass through the reactive sound-absorbing chamber N2 and the resistive sound-absorbing chamber N3 in sequence, which can improve the absorption of low, medium and high frequency broadband noise by this embodiment, improve the sound-absorbing efficiency, and broaden the sound-absorbing frequency band.

[0100] Example 7

[0101] Reference Fig. 9 , 17 , 18. This embodiment is different from the above embodiments in that the array muffler disclosed in this embodiment is formed by an array of impedance composite mufflers 100 of embodiment 6, and the second ends 101 - 2 of two impedance composite mufflers 100 can be directly connected via a second connector 302 .

[0102] At the same time, the impedance composite silencer 100 of two adjacent silencer units 300 in this embodiment is arranged relative to each other, that is, the silencer units 300 of this embodiment are arrayed side by side in the silencer chamber N4 of the frame 200, and the first end 101-1 of the silencer unit 300 is opposite to the first end 101-1 of the adjacent silencer unit 300. At this time, an expansion chamber silencer structure can be formed. Although the existence of the expansion chamber silencer structure increases the local resistance loss, at the same time, the expansion chamber silencer structure is a resistive silencer cavity resistive silencer structure, which has an additional silencer effect and can improve the overall silencer effect.

[0103] On this basis, the flow cross-section of the anechoic chamber N4 changes gradually, limiting the direct penetration of sound waves, and the derived expansion chamber increases the number of reflections of sound waves, improving the defect that high-frequency sound waves can easily pass directly through the air flow channel due to their short wavelength, effectively suppressing high-frequency failure phenomena.

[0104] Example 8

[0105] Reference Fig. 9 , 17 , 19. This embodiment is different from Embodiment 7 in that the impedance composite silencers 100 of two adjacent silencer units 300 are arranged in a staggered manner, that is, the silencer units 300 of this embodiment are arranged in a staggered array in the silencer chamber N4 of the frame 200, and the first end 101-1 of the silencer unit 300 is opposite to the second end 101-2 of the adjacent silencer unit 300. At this time, a folded plate silencer structure is formed, which has no additional resistive silencer effect, but reduces the local resistance loss.

[0106] The silencer formed in the form of an array in this embodiment has a flow cross-section of the silencer chamber N4 that changes alternately, forming a curved airflow channel, which can also limit the direct penetration of sound waves, improve the defect that high-frequency sound waves can easily pass directly through the airflow channel due to their short wavelength, and effectively suppress high-frequency failure phenomena.

[0107] The array type silencer with expansion chamber silencer structure in Example 7 and the array type silencer with folded plate silencer structure in Example 8 were tested in the south wind shaft and north wind shaft of Fenghuangshan Coal Mine of Shanxi Jinmei Group, and compared with the ordinary plate silencer previously used in the south wind shaft and north wind shaft of Fenghuangshan Coal Mine of Shanxi Jinmei Group. The comparison data refer to Fig. 20 ;

[0108] Depend on Fig. 20 It can be seen that the sound attenuation of Example 7 is significantly greater than that of the ordinary sheet-type silencer, and Example 7 has a good effect in absorbing low- and medium-frequency broadband noise or absorbing medium- and high-frequency broadband noise; the sound attenuation of Example 8 is generally greater than that of the ordinary sheet-type silencer. Compared with the ordinary sheet-type silencer, Example 8 has a good effect in absorbing medium- and high-frequency broadband noise and can effectively suppress high-frequency failure phenomenon.

[0109] Example 9

[0110] Reference Fig.21 This embodiment is different from the above embodiments in that the total length L of the impedance composite silencer 100 is 300-2000 mm, the side length a of the cross section of the first end 101-1 of the impedance composite silencer 100 is 100-500 mm, and the side length b of the cross section of the second end 101-2 of the impedance composite silencer 100 is 30-100 mm.

[0111] In order to ensure the effective sound-absorbing area of ​​the present invention and improve the sound-absorbing effect, according to the ratio, the side length a is 4 times the side length b, the total length L is 5 times the side length a, a:b=4 and L:a=5 can form a more suitable frustum shape;

[0112] A comparative test was conducted, and the comparative test examples were P1 and P2, wherein the array muffler formed by the impedance composite muffler 100 with a:b=2, L:a=10 in the comparative test example P1; the array muffler formed by the impedance composite muffler 100 with a:b=7, L:a=3 in the comparative test example P2, and the array muffler formed by the impedance composite muffler 100 with a:b=4, L:a=5 in the present embodiment were tested in the Hujiazhang wind shaft and Shangzhuang wind shaft of Sihe Coal Mine, respectively, and the test results were referred to Fig. 22 , 24 ,Depend on Fig. 22 It can be seen that the noise reduction of the comparative test example P2 is the smallest, and the noise reduction of the comparative test example P3 is the largest. Fig.23 It can be seen that the resistance loss of comparative test example P2 is the smallest, and the resistance loss of comparative test example P3 is the largest.

[0113] This is because, the smaller the ratio of a:b and the larger the ratio of L:a, the smaller the taper of the cone, which is approximately rod-shaped. Although the resistance is small and the aerodynamic performance is good, the effective contact area between the sound wave and the surface of the shell 101 is reduced, which is not conducive to sound elimination. At the same time, the expansion chamber formed between the rod-shaped impedance composite silencer 100 is not obvious, and the additional resistance sound elimination is very small. Moreover, the short-wave component is not easy to contact the impedance composite silencer 100, and the short wave can directly penetrate from the sound elimination channel, causing high-frequency failure.

[0114] The larger the ratio of a:b and the smaller the ratio of L:a, the greater the taper of the cone, which is approximately a pancake shape. Although it can increase the contact opportunity between the sound waves and the surface of the shell 101 and increase the effective sound absorption area, the greater the taper, the greater the resistance, and the poor aerodynamic performance will increase the energy consumption of the power equipment.

[0115] Example 10

[0116] Reference Fig.24 , 25 , this embodiment is different from the above embodiment in that: there are two first ends 101-1 and two second ends 101-2, the two first ends 101-1 are located between the two second ends 101-2, and the outer peripheral dimensions of the cross-section from the first end 101-1 to the second end 101-2 are gradually reduced; wherein, referring to Fig.24The outer circumferential dimensions of the cross sections of the two first ends 101-1 are the same, the outer circumferential dimensions of the cross sections of the two second ends 101-2 are the same, the two first ends 101-1 are connected by a third side plate 101a-3 and a fourth side plate 101a-4, the third side plate 101a-3 and the fourth side plate 101a-4 are both rectangular plates, the third side plate 101a-3 is a micro-perforated plate that is the same as the first side plate 101a-1, and the fourth side plate 101a-4 is a micro-perforated plate that is the same as the second side plate 101a-2 The perforated plate, the third side plate 101a-3 and the fourth side plate 101a-4 are arranged in sequence along the circumferential direction; the third side plate 101a-3 has the second side plate 101a-2 on both sides, and the fourth side plate 101a-4 has the first side plate 101a-1 on both sides, that is, the reactive silencer cavity N2 and the resistive silencer cavity N3 are staggered, and the sound waves continuously pass through the reactive silencer cavity N2 and the resistive silencer cavity N3 in sequence, which can improve the absorption of low, medium and high frequency broadband noise by this embodiment, improve the silencer efficiency, and broaden the silencer frequency band.

[0117] Among them, refer to Fig.25 The skeleton 102 also includes a partition plate 102d, which is rectangular. There are two central partition plates 102c, which are respectively located at the first end 101-1 and perpendicular to the central tube 102b; a circular hole with a diameter of 4 to 10 mm is made in the center of the central partition plate 102c by using a hole opener, and the central tube 102b is installed and fixed in the circular hole. The central tube 102b is perpendicular to the central partition plate 102c, and the central tubes 102b on both sides of the central partition plate 102c have the same length. The partition plate 102d is located between the two central partition plates 102c. There are six partition plates 102d that are evenly distributed along the circumference of the central tube 102b, and the chambers on both sides of the central partition plate 102c are independent of each other.

[0118] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0119] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0120] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0121] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An impedance composite muffler, characterized in that: The impedance composite muffler (100) comprises: A shell (101) is in the shape of a hollow column surrounded by a plurality of side plates (101a); the cross section of the shell (101) is a regular polygon, the number of sides of the polygon is an even number, the shell (101) comprises a first end (101-1) and a second end (101-2), and the outer circumference of the cross section from the first end (101-1) to the second end (101-2) gradually decreases; A skeleton (102) is located in the accommodating space (N1) of the shell (101), and the skeleton (102) divides the accommodating space (N1) into chambers that are distributed along the circumference of the shell (101) and are independent of each other; the chambers include a reactive silencing chamber (N2) and a resistive silencing chamber (N3), and the reactive silencing chamber (N2) and the resistive silencing chamber (N3) are arranged in sequence; and, A sound absorbing material (103), wherein the sound absorbing material (103) is filled in the resistive anechoic cavity (N3); The side plate (101a) comprises a first side plate (101a-1) and a second side plate (101a-2), and the first side plate (101a-1) and the second side plate (101a-2) are arranged in sequence along the circumferential direction; the first side plate (101a-1) is a micro-perforated plate, and the second side plate (101a-2) is a perforated plate; the reactive silencing cavity (N2) is formed between two partition plates (102a) connected to both sides of the first side plate (101a-1); and the resistive silencing cavity (N3) is formed between two partition plates (102a) connected to both sides of the second side plate (101a-2); The skeleton (102) comprises partitions (102a) distributed along the circumference of the shell (101), and two adjacent partitions (102a) are respectively connected to two sides of the same side plate (101a); the chamber is formed between the two adjacent partitions (102a); The skeleton (102) further comprises a central tube (102b) located at the axis of the shell (101); the partitions (102a) are fixedly connected to the central tube (102b); There are two second ends (101-2), the first end (101-1) is located between the two second ends (101-2), and the outer peripheral dimensions of the cross sections from the first end (101-1) to the second ends (101-2) on both sides gradually decrease; the outer peripheral dimensions of the cross sections of the two second ends (101-2) are the same; The skeleton (102) further comprises a central partition (102c), wherein the central partition (102c) is located at the first end (101-1) and is perpendicular to the central tube (102b); the partitions (102a) are symmetrically arranged with respect to the central partition (102c); the chambers on both sides of the central partition (102c) are independent of each other; and the first side plates (101a-1) and the second side plates (101a-2) on both sides of the central partition (102c) are staggered.

2. The impedance composite muffler according to claim 1, characterized in that: The perforation rate of the first side plate (101a-1) is ≤5%, and the perforation rate of the second side plate (101a-2) is 20-30%.

3. An array type muffler, characterized in that: include, frame(200); as well as, Noise elimination units (300), the noise elimination units (300) being arranged in an array in the noise elimination chamber (N4) of the frame (200); Wherein, the muffler unit (300) is formed by connecting the impedance composite muffler (100) according to any one of claims 1 to 2 in the length direction; Wherein, the outer peripheral dimension of the cross section of the muffler unit (300) changes continuously in the length direction.

4. The array type muffler according to claim 3, characterized in that: The impedance composite silencers (100) of two adjacent silencer units (300) are arranged relative to each other or staggered.

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