Tunnel low-frequency series-parallel shrinkage pipe silencer

Abstract

The invention discloses a tunnel low-frequency series-parallel shrinkage pipe silencer. The tunnel low-frequency series-parallel shrinkage pipe silencer comprises a shell and five sets of series-parallel shrinkage silencer bodies. A front panel of the shell is provided with a left sound channel and a right sound channel which are mutually incident / emergent sound channels; five groups of series-parallel shrinkage pipe silencers are arranged in the shell and are connected with the left sound channel and the right sound channel through a front panel; one group of series-parallel type shrinkage pipe silencers comprises nine series type shrinkage pipe silencers and one shrinkage pipe silencer; the tandem type shrinkage pipe silencer is formed by connecting an incident / emergent port, a vertex sub-expansion pipe and a non-vertex sub-expansion pipe through a shrinkage pipe. Each sub-expansion pipe can be analogous as an incident / emergent port, and one section of expansion pipe is embedded into the sub-expansion pipe, which is equivalent to one shrinkage pipe silencer connected in series; mass production can also be achieved through the silencer primary and secondary mold. The low-medium-frequency-band silencer is excellent in low-medium-frequency-band silencing performance, wide in silencing frequency band, capable of being produced in batches and good in application prospect.

Description

Technical Field

[0001] The invention relates to a silencer, in particular to a tunnel low-frequency parallel-parallel type shrinkable tube silencer. Background Art

[0002] As a semi-enclosed space, the noise in the tunnel is reflected multiple times by the tunnel wall, superimposed and transmitted into the car body, forming a speaker effect, which seriously affects the passengers' riding comfort experience. By laying sound-absorbing and sound-insulating materials in the car, the mid- and high-frequency noise is significantly reduced, but the noise reduction effect of low-frequency noise, which is insensitive to human hearing and extremely harmful to the body, is poor.

[0003] Low-frequency noise has the characteristics of large wavelength, difficult attenuation, and strong penetration. The wheel-rail noise and aerodynamic noise generated by trains running in tunnels undergo multiple reflections and coupling in closed or semi-closed tunnels, resulting in a sharp increase in the reverberation effect and a prolonged reverberation time.

[0004] As train speeds continue to increase and the time it takes to travel through tunnels is shortened, little attention has been paid to reducing the reverberation noise in tunnels through tunnel wall silencers to further improve passenger comfort. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a tunnel low-frequency hybrid shrinkable tube silencer which has good low-frequency silencing effect, occupies a small space, and is convenient for batch production and construction.

[0006] In order to solve the above-mentioned problem, the present invention discloses a tunnel low-frequency hybrid shrinkable tube silencer, characterized in that: the silencer comprises a rectangular parallelepiped shell composed of two front and rear panels (3), two lower bottom panels (4), and two side panels (5); the front panel (3) is close to the track side, and is respectively provided with a left sound channel (1) and a right sound channel (2), and the left sound channel and the right sound channel are incident / exit sound channels for each other; the hybrid shrinkable tube silencer (12) refers to a series shrinkable tube silencer (13-21) and a shrinkable tube silencer (22) connected in parallel through the front panel (3); the series shrinkable tube silencer (13-21) comprises a plurality of ports (6), a plurality of vertex sub-expansion tubes (7), a plurality of non-vertex sub-expansion tubes (8), a plurality of normal shrinkable tubes (9), and a plurality of parallel shrinkable tubes (10).

[0007] The left sound channel (1) and the right sound channel (2) are respectively located on both sides of the front panel (3). The front panel is provided with holes with a diameter of 10 mm in the intervals of 0 mm to 155 mm and 165 mm to 320 mm from left to right, wherein the interval of 0 mm to 155 mm is the left sound channel (1), and the interval of 165 mm to 320 mm is the right sound channel (2).

[0008] The incident / exit port (6) is located behind the front panel and is a round tube with an inner diameter of 9 mm, a thickness of 0.5 mm, and a height of 10 mm.

[0009] The vertex sub-expansion tube (7) is an expansion tube located at the vertex of the rectangle in the frame schematic diagram (26), and is a circular tube with an inner diameter of 9 mm, a thickness of 0.5 mm, and a height of 12 mm.

[0010] The non-apex sub-expansion tube (8) is located between the two apex sub-expansion tubes and is a round tube with an inner diameter of 9 mm, a thickness of 0.5 mm, and a height of 10 mm.

[0011] The shrink tube is located between the incident / exit port, the vertex sub-expansion tube and the non-vertex sub-expansion tube, and is a circular tube with an inner diameter of 3 mm, a thickness of 0.5 mm and different lengths. The normal shrink tube (9) is located between the incident / exit port (6) and the vertex sub-expansion tube (7), and the lengths from both sides of the long side of the front panel to the middle are 85.55 mm, 75.55 mm, 65.55 mm, 55.55 mm, 45.55 mm, 35.55 mm, 25.55 mm, 15.55 mm and 5.55 mm, respectively. The parallel shrinkage tube (10) is located between the vertex sub-expansion tube and the non-vertex sub-expansion tube, and the parallel shrinkage tubes of the same muffler are the same; with the plane where the front panel (3) is located as a reference, from far to near, the lengths of the parallel shrinkage tube (10) are 19mm, 18.89mm, 18.75mm, 18.57mm, 18.33mm, 18.00mm, 17.50mm, 16.68mm, and 15mm respectively.

[0012] The series-connected contraction tube silencer (13-21) refers to a silencer in which a vertex sub-expansion tube is embedded at the vertex between the incident / exit ports, with the silencer distribution frame as a reference, and several non-vertex sub-expansion tubes are embedded between two vertices and connected in series through a contraction tube. The radius of the port is equal to that of the expansion tube, which is equivalent to a silencer formed by several contraction tube silencers connected in series. The number of non-vertex sub-expansion tubes is (a-30N) / 30, and N is the number of sub-expansion tubes located on the long side of the rectangle in the frame structure schematic diagram (26).

[0013] The frame structure schematic diagram (26) refers to a plane where a rectangle with a length of a and a width of b is located, which is indented at equal intervals of a / 10 and b / 10. The long sides of the small rectangles formed by the indentation coincide with the long side a, and the center points of the coincident long sides of all rectangles are the same. In the present invention, the long side a=300mm, the short side b=100mm, as shown in FIG. Figure 6 shown.

[0014] The shrinkable tube silencer (22) is a silencer device formed by connecting a port in a left sound channel (1) with a port in a right sound channel (2) using a shrinkable tube.

[0015] The series-connected shrinkable tube silencer (12) is located inside the housing and is a silencer assembly formed by connecting the series-connected shrinkable tube silencers (13-21) and the shrinkable tube silencer (22) in parallel via a front panel. Figure 2 shown.

[0016] The filler (11) refers to an easily solidifiable substance filled between the series-parallel shrinkable tube silencer (12) and the shell.

[0017] The muffler sub-mold (23) is formed by burying 1 / 2 of the hybrid shrinkable tube muffler (12) in a readily condensable material, such as Figure 3 shown.

[0018] The muffler master mold (24) is a rectangular parallelepiped groove with an inner length of 320 mm, a width of 110 mm, and a height of 10 mm. Figure 4 shown. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 The figure is a cross-sectional schematic diagram of a set of series-connected shrinkable tube silencers of the present invention.

[0022] Figure 3 It is a schematic diagram of a sub-mold of the present invention.

[0023] Figure 4 It is a schematic diagram of the mother mold of the present invention.

[0024] Figure 5 It is a sample formed by processing the mold of the present invention.

[0025] Figure 6 It is a schematic diagram of the component distribution framework of various mufflers of the present invention.

[0026] Figure 7 A schematic diagram of the sound transmission loss of the present invention obtained by finite element simulation.

[0027] In the figure: 1—left sound channel; 2—right sound channel; 3—front and rear panels; 4—upper and lower bottom plates; 5—left and right side plates; 6—incident / exit ports; 7—apex sub-expansion tube; 8—non-apex sub-expansion tube; 9—normal contraction tube; 10—parallel contraction tube; 11—filler; 12—parallel-connected contraction tube silencer; 13~21—tandem contraction tube silencer; 22—contraction tube silencer; 23—muffler processing sub-mold; 24—muffler processing mother mold; 25—muffler parts produced by muffler mother-and-child molds; 26—distribution diagram of various muffler parts of the present invention. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, a tunnel low-frequency hybrid shrinkable tube silencer comprises a rectangular parallelepiped shell composed of two front and rear panels (3), two upper and lower bottom plates (4) and two left and right side plates (5), five groups of hybrid shrinkable tube silencers (12), a filler (11), a sub-mold (23) and a mother mold (24); the front panel (3) is close to the track side and is respectively provided with a left sound channel (1) and a right sound channel (2), and the left sound channel (1) and the right sound channel (2) are mutually incident / exit. The sound emission channel; the hybrid type contraction tube silencer (12) is provided with nine series type contraction tube silencers (13-21) and one contraction tube silencer (22); the series type contraction tube silencers (13-21) are provided with a plurality of incident / exit ports (6), a plurality of vertex sub-expansion tubes (7), a plurality of non-vertex sub-expansion tubes (8), a plurality of normal contraction tubes (9) and a plurality of parallel contraction tubes (10); the contraction tube silencer (22) is provided with an incident port (6), an exit port (6) and a contraction tube.

[0029] Holes with a diameter of 10 mm and a depth of 2 mm are provided on the front panel (3) from left to right in the intervals of 0 mm to 155 mm and 165 mm to 320 mm, respectively. The interval of 0 mm to 155 mm is the left sound channel (1), and the interval of 165 mm to 320 mm is the right sound channel (2).

[0030] The rear panel (3) is a rectangular thin plate with a length of 320 mm, a width of 100 mm and a thickness of 2 mm.

[0031] The bottom plate (4) is a rectangular thin plate with a length of 320 mm, a width of 104 mm and a thickness of 2 mm.

[0032] The side plate (5) is a rectangular thin plate with a length of 104 mm, a width of 104 mm and a thickness of 2 mm.

[0033] The incident / exit port (6) is a circular tube with an inner diameter of 9 mm, a length of 10 mm, and a thickness of 1 mm.

[0034] The vertex expansion tube (7) is a round tube with an inner diameter of 9 mm, a length of 12.5 mm, and a thickness of 1 mm.

[0035] The non-apex expansion tube (8) is a round tube with an inner diameter of 9 mm, a length of 10 mm, and a thickness of 1 mm.

[0036] The muffler frame structure schematic diagram (26) refers to the plane where the rectangle with a length of a and a width of b is located, which is indented at equal intervals of a / 10 and b / 10. The long sides of the small rectangles formed coincide with one long side a of the initial rectangle, and the midpoints of the coincident long sides of all rectangles are the same, such as Figure 6 In the present invention, a=300mm and b=100mm.

[0037] The serial contraction tube silencer (13-21) is composed of an incident / exit port (6), a vertex sub-expansion tube (7), a non-vertex sub-expansion tube (8), a plurality of normal contraction tubes (9), and a plurality of parallel contraction tubes (10); wherein in the same serial contraction tube silencer, the normal contraction tubes (9) between the port (6) and the vertex sub-expansion tube (7) are of equal length, and the parallel contraction tubes (10) between the two vertex sub-expansion tubes (7) are of equal length; the serial contraction tube silencer (13-21 ), the number of non-apex sub-expansion tubes (8) is 9, 8, 7, 6, 5, 4, 3, 2, and 1, respectively; the number of parallel contraction tubes (10) located between two vertex sub-expansion tubes (7) is 10, 9, 8, 7, 6, 5, 4, 3, and 2, respectively, and the lengths of the contraction tubes are 19 mm, 18.89 mm, 18.75 mm, 18.57 mm, 18.33 mm, 18 mm, 17.5 mm, 16.67 mm, and 15 mm, respectively; the lengths of the normal contraction tube (9) located between the port (6) and the vertex sub-expansion tube (7) are 85.34 mm, 75.34 mm, 65.34 mm, 55.34 mm, 45.34 mm, 35.34 mm, 25.34 mm, 15.34 mm, and 5.34 mm, respectively.

[0038] The shrink tube silencer (22) refers to a silencer consisting of two inlet / outlet ports (6) and a shrink tube, wherein the shrink tube has a length of 30 mm.

[0039] The silencers (13-22) are embedded in the shell from left to right in sequence and fixed to form a set of hybrid shrinkable tube silencers. According to the above method, 5 sets of hybrid shrinkable tube silencers (12) are embedded in the shell and fixed to form a set of hybrid shrinkable tube silencers. Figure 2 The low frequency series-parallel shrink tube silencer shown.

[0040] 1 / 2 of the hybrid shrink silencer (12) is horizontally embedded in the mold slot, or buried in a quick-setting material to form a Figure 3 The sub-mold (23) is shown.

[0041] Use PVC board or iron sheet to make the mother mold (24), so that the inner part of the mother mold (24) is a rectangular container with a length of 320 mm, a width of 100 mm, and a height of 10 mm. Figure 4 shown.

[0042] The material to be processed is poured into the master mold (24), and extruded by the daughter mold (23), and solidified to form a Figure 5 The sample (25) shown, two samples (25) are combined together to form a low-frequency hybrid shrink tube silencer (10) unit.

[0043] The noise reduction effect of the present invention is as follows Figure 7 As shown, in the low and medium frequency band of 110Hz~2000Hz, the sound attenuation is 13.4dB, among which the sound transmission loss in the low frequency range of 310Hz~760Hz reaches 24dB, and the bandwidth reaches 450Hz.

Claims

1. A tunnel low-frequency hybrid shrink tube silencer, characterized by: The silencer comprises a rectangular parallelepiped shell consisting of two front and rear panels (3), two upper and lower bottom panels (4), and two left and right side panels (5); the front panel (3) is close to the track and is provided with a left sound channel (1) and a right sound channel (2), and the left sound channel (1) and the right sound channel (2) are incident / exit channels for each other; the shell is provided with five groups of mixed-parallel type shrinkable tube silencers (12), each group of mixed-parallel type shrinkable tube silencers is provided with a series-connected shrinkable tube silencer (13-21) and a shrinkable tube silencer (13-21). The series-connected shrinkable tube silencer (13-21) is provided with an incident / exit port (6), a plurality of vertex sub-expansion tubes (7), a plurality of non-vertex sub-expansion tubes (8), a plurality of normal shrinkable tubes (9) and a plurality of parallel shrinkable tubes (10); a quick-setting material (11) is filled in the shell to fix the components in the shell and enhance the sealing performance; the series-connected shrinkable tube silencer (12) can also be formed by combining a sample (25) produced in batches through a sub-mold (23) and a mother mold (24).

2. A tunnel low-frequency hybrid shrink tube silencer according to claim 1, characterized in that: Holes with a diameter of 10 mm are provided on the long side of the front panel (3) in the intervals of 0 mm to 155 mm and 165 mm to 320 mm from left to right, wherein the interval of 0 mm to 155 mm is the left sound channel (1), and the interval of 165 mm to 320 mm is the right sound channel (2).

3. A tunnel low-frequency hybrid shrink tube silencer according to claim 1, characterized in that: The layout framework of each component of the in-shell shrink tube silencer refers to a plane where the length a and the width b are located, and the plane is indented at equal intervals of a / 10 and b / 10, and the long sides of the small rectangles formed by the indentation all coincide with the long side a, and one long side of all rectangles coincides and has the same midpoint; the present invention takes a=300mm and b=100mm; the incident / exit port (6), the vertex sub-expansion tube (7), and the non-vertex sub-expansion tube (8) are regularly distributed on the sides of each rectangle and connected by a shrink tube to form a series shrink tube silencer (13-21) and a shrink tube silencer (22) with different structures.

4. The tunnel low-frequency hybrid shrink tube silencer according to claim 1 is characterized by: The shrinkable tube silencer (22) refers to a silencer device formed by connecting two ports (6) via a shrinkable tube.

5. The tunnel low-frequency hybrid shrink tube silencer according to claim 1 is characterized by: The hybrid shrink tube silencer (12) is composed of nine series-connected shrink tube silencers (13-21) and one shrink tube silencer (22). In the same series-connected shrink tube silencer, the normal shrink tube (9) located between the port (6) and the vertex sub-expansion tube (7) and perpendicular to the front panel (3) has the same length, and the parallel shrink tube (10) located between the vertex sub-expansion tubes (7) and axially parallel to the front panel (3) has the same length. In the series-connected shrink tube silencer (13-21), the number of non-vertex sub-expansion tubes (8) is 9, 8, 7, 6, 5, 4, 3, 2, and 1, respectively; the number of non-vertex sub-expansion tubes (8) located between the vertex sub-expansion tubes (7) is 9, 8, 7, 6, 5, 4, 3, 2, and 1, respectively. The number of sections of the parallel shrink tube (10) is 10, 9, 8, 7, 6, 5, 4, 3, and 2, respectively, and the lengths of the shrink tubes are 19 mm, 18.89 mm, 18.75 mm, 18.57 mm, 18.33 mm, 18 mm, 17.5 mm, 16.67 mm, and 15 mm, respectively; the lengths of the normal shrink tube (9) between the port (6) and the vertex sub-expansion tube (7) are 85.34 mm, 75.34 mm, 65.34 mm, 55.34 mm, 45.34 mm, 35.34 mm, 25.34 mm, 15.34 mm, and 5.34 mm, respectively.

6. The tunnel low-frequency hybrid shrink tube silencer according to claim 1, characterized in that: The hybrid shrinkable tube silencer (12) can be mass-produced through a sub-mold (23) and a mother mold (24); the sub-mold (23) is a group of low-frequency hybrid shrinkable tube silencers (12) embedded in a slot or buried in a quick-setting material; the mother mold (24) is a rectangular parallelepiped slot with an inner side length of 320 mm, a width of 100 mm, and a height of 10 mm.

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