Silencing device with adjustable resonant frequency

Abstract

A silencing device with the adjustable resonant frequency comprises a main pipeline, a sleeve and a plurality of resonators, the resonant frequencies of the resonators are different, the resonators are arranged on the peripheral face of the sleeve at intervals, the necks of the resonators are all communicated with the sleeve, and the necks of the resonators are communicated with the main pipeline. The casing pipe is rotatably connected to the outer peripheral surface of the main pipeline, a notch communicated with the main pipeline is formed in the outer peripheral surface, located on the inner side of the casing pipe, of the main pipeline, a neck opening of the resonator is matched with the notch of the main pipeline, and the outer peripheral surface of the main pipeline is connected with a locking device used for fixing the resonator. According to the design, the resonators with different resonant frequencies are sequentially connected with the main pipeline by rotating the sleeve, so that the resonant frequency of the pipeline is changed, noise of different frequency bands in the pipeline is reduced, and the device is convenient to use and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline noise processing, in particular to a noise reduction device with adjustable resonance frequency. Background Art

[0002] At present, the control of urban noise pollution has received more and more attention as people's quality of life improves. The construction of subways is mainly carried out in urban areas with concentrated residents. The treatment of mechanical equipment noise at the construction site is one of the important factors in creating high-quality projects. At present, the control of noise is mainly carried out from three aspects: the sound source, the propagation path and the ear. The control technology of pipeline noise belongs to the means of control from the propagation path. Using resonators to reduce noise is a common method of silencing, but the silencing performance of resonators has certain limitations. The resonator frequency of the resonator is determined by its own structural parameters. When the design parameters of the resonator are determined, its silencing frequency band is also determined. Therefore, the resonator can only be used in a specific silencing frequency band. For noise outside the specific frequency band, the resonator almost loses its function and the noise reduction effect almost disappears. This requires frequent replacement of resonators that match the noise frequency band when performing noise reduction, which is extremely inconvenient to use and has large limitations on noise reduction. Summary of the invention

[0003] The utility model aims to overcome the defects and problems of the resonator in the prior art, such as being inconvenient to use and having large noise reduction limitations, and to provide a noise reduction device with adjustable resonance frequency which is easy to use and has a wide range of applications.

[0004] To achieve the above objectives, the technical solution of the utility model is: a silencer with adjustable resonant frequency, comprising a main pipe, a sleeve and a plurality of resonators, the resonant frequency of each resonator being different, a plurality of resonators being arranged at intervals on the outer circumferential surface of the sleeve, the necks of a plurality of resonators being connected to the sleeve, the sleeve being rotatably connected to the outer circumferential surface of the main pipe, a notch connected to the main pipe being provided on the outer circumferential surface of the main pipe located on the inner side of the sleeve, the neck opening of the resonator being matched with the notch of the main pipe, and a locking device for fixing the resonator being connected to the outer circumferential surface of the main pipe.

[0005] The inner wall of the sleeve near both ends is provided with circular slide rails, and the outer peripheral surface of the main pipeline is provided with two circular slideways matching the two circular slide rails. The two circular slideways are respectively slidably connected to the two circular slide rails, and the notch is located between the two circular slideways.

[0006] The locking device includes a fastener and a plurality of locks, the plurality of locks are connected to the necks of the plurality of resonators in a one-to-one correspondence, the fastener is connected to the outer peripheral surface of the main pipe through a support rod, and the fastener is fastened and connected to the locks.

[0007] The plurality of lock buckles are distributed in a circumferential manner along the axis of the main pipe.

[0008] The buckle comprises a vertical rod and a buckle body, one end of the vertical rod is rotatably connected to the upper end of the support rod, the buckle body is connected to the other end of the vertical rod, and the buckle body is buckled and connected to the lock buckle.

[0009] There are two support rods, and the two support rods are vertically connected to the outer circumference of the main pipeline. The upper ends of the two support rods are connected to mounting plates, and a connecting column is connected between the two mounting plates. One end of the vertical rod is connected to a rotating plate, and the rotating plate is sleeved on the outer circumference of the connecting column.

[0010] The lock comprises a buckle and a fixing rod. The buckle is a rectangular frame structure. The buckle body is embedded in the buckle. One end of the fixing rod is connected to the outer side of the buckle, and the other end of the fixing rod is connected to the neck of the resonator.

[0011] A fixing piece is connected between the neck of the resonator and the buckle ring.

[0012] The plurality of resonators include a plurality of Helmholtz resonators and a plurality of side branch resonators. The resonance frequencies of the plurality of Helmholtz resonators are different from each other, and the resonance frequencies of the plurality of side branch resonators are different from each other.

[0013] The number of the resonators is four, the number of the Helmholtz resonators and the number of the side branch resonators are both two, the neck lengths and the volumes of the resonance cavities of the two Helmholtz resonators are different, and the resonance tube lengths of the two side branch resonators are different.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. In the utility model, a noise reduction device with adjustable resonance frequency can realize resonators with different resonance frequencies working on the same pipeline by rotating the sleeve, and achieve noise reduction under different working conditions according to the different resonance frequencies of the resonators. The device can achieve noise reduction of the resonator without any replacement of spare parts, has strong practicality, and has a simple structure and easy operation, which solves the problem of single noise reduction of the resonator. Therefore, the utility model is easy to use and has a wide range of applications.

[0016] 2. In the utility model, a silencer with adjustable resonance frequency is adopted. The combination of the slide rail and the slideway makes the rotation of the sleeve smoother and more stable. The locking device adopts the connection mode of buckle ring and buckle body. After switching the resonator, the buckle ring on the neck of the resonator is matched with the buckle body on the main pipe to fix the resonator directly. The vertical rod adopts the rotation mode. When switching the resonator, the buckle body can be taken out from the buckle ring by rotating the vertical rod. After the sleeve is rotated into place, the vertical rod is rotated in the opposite direction to connect the buckle body with the buckle ring on the neck of the resonator. The buckle ring is reinforced by setting a fixing part to make the device structure more stable. Therefore, the utility model has a stable structure and is easy to use.

[0017] 3. In the utility model, a noise reduction device with adjustable resonance frequency is provided, wherein the resonator adopts the design of Helmholtz resonator and side branch resonator. The Helmholtz resonator can be used for noise reduction in the low frequency band, and the side branch resonator can be used for noise reduction in the medium frequency band. A plurality of Helmholtz resonators and a plurality of side branch resonators are provided at the same time, and the resonance frequency of each resonator is different, thereby realizing the noise reduction of the resonator in the low and medium frequency bands. Therefore, the utility model has a wide range of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of a resonator and a sleeve in the utility model.

[0020] Figure 3 It is a structural schematic diagram of the sleeve in the utility model.

[0021] Figure 4 It is a structural schematic diagram of the fastener in the utility model.

[0022] Figure 5 It is a structural schematic diagram of the lock buckle in the utility model.

[0023] In the figure: main line 1, notch 11, circular slide 12, sleeve 2, circular slide rail 21, resonator 3, Helmholtz resonator 31, side branch resonator 32, locking device 4, fastener 41, vertical rod 411, buckle body 412, lock 42, buckle 421, fixing rod 422, fixing piece 423, support rod 43, mounting plate 44, connecting column 45, rotating plate 46. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Embodiment 1:

[0026] See also Figures 1 to 5A silencer with adjustable resonance frequency comprises a main pipe 1, a sleeve 2 and a plurality of resonators 3, the resonance frequency of each resonator 3 is different, a plurality of resonators 3 are arranged at intervals on the outer circumference of the sleeve 2, the necks of the plurality of resonators 3 are connected with the sleeve 2, the sleeve 2 is rotatably connected to the outer circumference of the main pipe 1, the outer circumference of the main pipe 1 located inside the sleeve 2 is provided with a notch 11 connected with the main pipe 1, the neck opening of the resonator 3 matches the notch 11 of the main pipe 1, and the outer circumference of the main pipe 1 is connected with a locking device 4 for fixing the resonator 3.

[0027] The inner wall of the sleeve 2 near both ends is provided with circular slide rails 21, and the outer peripheral surface of the main pipeline 1 is provided with two circular slideways 12 matching the two circular slide rails 21. The two circular slideways 12 are respectively slidably connected to the two circular slide rails 21, and the notch 11 is located between the two circular slideways 12.

[0028] In this embodiment, when in use, the rotating sleeve 2 allows the resonator 3 to rotate on the main pipe 1. When the resonator 3 rotates to above the main pipe 1, the resonator 3 is fixed to the main pipe 1 by the locking device 4. When the stressor changes, the resonator 3 and the main pipe 1 are unlocked by the locking device 4, and the rotating sleeve 2 allows the resonator 3 in the corresponding sound-absorbing frequency domain to be connected to the main pipe 1 to complete the adjustment.

[0029] Embodiment 2:

[0030] The basic content is the same as that of Example 1, except that:

[0031] See also Figure 4 and Figure 5The locking device 4 includes a fastener 41 and a plurality of locks 42. The plurality of locks 42 are connected to the necks of the plurality of resonators 3 in a one-to-one correspondence. The fastener 41 is connected to the outer peripheral surface of the main pipeline 1 through a support rod 43. The fastener 41 is buckled and connected to the locks 42. The plurality of locks 42 are distributed in a circular pattern along the axis of the main pipeline 1. The fastener 41 includes a vertical rod 411 and a buckle body 412. One end of the vertical rod 411 is rotatably connected to the upper end of the support rod 43. The buckle body 412 is connected to the other end of the vertical rod 411. The buckle body 412 is buckled and connected to the locks 42. There are two support rods 43, and the two support rods 43 are vertically connected to the outer circumference of the main pipeline 1. The upper ends of the two support rods 43 are connected to a mounting plate 44, and a connecting column 45 is connected between the two mounting plates 44. One end of the vertical rod 411 is connected to a rotating plate 46, and the rotating plate 46 is sleeved on the outer circumference of the connecting column 45. The lock buckle 42 includes a buckle ring 421 and a fixing rod 422. The buckle ring 421 is a rectangular frame structure. The buckle body 412 is embedded in the buckle ring 421. One end of the fixing rod 422 is connected to the outer side of the buckle ring 421, and the other end of the fixing rod 422 is connected to the neck of the resonator 3.

[0032] A fixing member 423 is connected between the neck of the resonator 3 and the buckle ring 421 .

[0033] In this embodiment, when in use, the buckle body 412 on the main pipe 1 is rotated and lowered through the vertical rod 411. When the buckle body 412 can be just embedded in the buckle ring 421, the resonator 3 is fixed to the main pipe 1. When the stress source changes, the buckle body 412 is pulled out, and the sleeve 2 is rotated to the resonator 3 corresponding to the sound-absorbing frequency domain, and the buckle body 412 is embedded in the buckle ring 421 on the resonator 3 to complete the adjustment.

[0034] Embodiment 3:

[0035] The basic content is the same as that of Example 1, except that:

[0036] See also Figure 2 The multiple resonators 3 include multiple Helmholtz resonators 31 and multiple side branch resonators 32. The resonance frequencies of the multiple Helmholtz resonators 31 are different from each other, and the resonance frequencies of the multiple side branch resonators 32 are different from each other. The number of the Helmholtz resonators 31 and the number of the side branch resonators 32 are both two, the height of the neck of the two Helmholtz resonators 31 and the specification parameters of the resonance cavity are different, and the resonance cavity lengths of the two side branch resonators 32 are different.

[0037] In this embodiment, the resonant frequency calculation expression of the Helmholtz resonator 31 is:

[0038]

[0039] The resonance frequency of the side branch resonator 32 is calculated by:

[0040] f=(c / l)*(2n+1) / 4; n=0,1,2,3,…;

[0041] Wherein, c is the speed of sound; l is the tube length of the side branch resonator 32; l1 is the neck length of the Helmholtz resonator 31; S1 is the neck cross-sectional area of ​​the Helmholtz resonator 31; and V is the resonance cavity volume of the Helmholtz resonator 31.

Claims

1. A muffler with adjustable resonance frequency, characterized in that: The invention comprises a main pipe (1), a sleeve (2) and a plurality of resonators (3), wherein the resonance frequency of each resonator (3) is different, the plurality of resonators (3) are arranged at intervals on the outer peripheral surface of the sleeve (2), the necks of the plurality of resonators (3) are connected to the sleeve (2), the sleeve (2) is rotatably connected to the outer peripheral surface of the main pipe (1), the outer peripheral surface of the main pipe (1) located inside the sleeve (2) is provided with a notch (11) connected to the main pipe (1), the neck opening of the resonator (3) matches the notch (11) of the main pipe (1), and the outer peripheral surface of the main pipe (1) is connected to a locking device (4) for fixing the resonator (3).

2. A muffler with adjustable resonance frequency according to claim 1, characterized in that: The inner wall of the sleeve (2) near both ends is provided with circular slide rails (21), and the outer peripheral surface of the main pipe (1) is provided with two circular slideways (12) matching the two circular slide rails (21), the two circular slideways (12) are respectively slidably connected to the two circular slide rails (21), and the notch (11) is located between the two circular slideways (12).

3. A muffler with adjustable resonance frequency according to claim 1, characterized in that: The locking device (4) comprises a fastener (41) and a plurality of locks (42), wherein the plurality of locks (42) are connected to the necks of the plurality of resonators (3) in a one-to-one correspondence, the fastener (41) is connected to the outer peripheral surface of the main pipe (1) via a support rod (43), and the fastener (41) is fastened and connected to the locks (42).

4. A muffler with adjustable resonance frequency according to claim 3, characterized in that: The plurality of lock buckles (42) are distributed in a circular pattern along the axis of the main pipe (1).

5. A muffler with adjustable resonance frequency according to claim 3, characterized in that: The buckle (41) comprises a vertical rod (411) and a buckle body (412), one end of the vertical rod (411) is rotatably connected to the upper end of the support rod (43), the buckle body (412) is connected to the other end of the vertical rod (411), and the buckle body (412) is buckled and connected to the lock buckle (42).

6. A muffler with adjustable resonance frequency according to claim 5, characterized in that: There are two support rods (43), and the two support rods (43) are vertically connected to the outer peripheral surface of the main pipeline (1). The upper ends of the two support rods (43) are connected to mounting plates (44), and a connecting column (45) is connected between the two mounting plates (44). One end of the vertical rod (411) is connected to a rotating plate (46), and the rotating plate (46) is sleeved on the outer peripheral surface of the connecting column (45).

7. A muffler with adjustable resonance frequency according to claim 5, characterized in that: The lock buckle (42) comprises a buckle ring (421) and a fixing rod (422); the buckle ring (421) is a rectangular frame structure; the buckle body (412) is embedded in the buckle ring (421); one end of the fixing rod (422) is connected to the outside of the buckle ring (421); and the other end of the fixing rod (422) is connected to the neck of the resonator (3).

8. A muffler with adjustable resonance frequency according to claim 7, characterized in that: A fixing member (423) is connected between the neck of the resonator (3) and the buckle ring (421).

9. A muffler with adjustable resonance frequency according to claim 2, characterized in that: The plurality of resonators (3) include a plurality of Helmholtz resonators (31) and a plurality of side branch resonators (32); the resonance frequencies of the plurality of Helmholtz resonators (31) are different from each other, and the resonance frequencies of the plurality of side branch resonators (32) are different from each other.

10. A muffler with adjustable resonance frequency according to claim 9, characterized in that: The number of the resonators (3) is four, the number of the Helmholtz resonators (31) and the number of the side branch resonators (32) are both two, the neck lengths and the volumes of the resonance cavities of the two Helmholtz resonators (31) are different, and the resonance tube lengths of the two side branch resonators (32) are different.

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