Frequency-adjustable interpolation expansion chamber silencing device and use method thereof

Abstract

The invention discloses a frequency-adjustable interpolation expansion chamber silencing device and a using method thereof.The silencing device comprises a main pipeline, a telescopic pipe, a movable interpolation pipe, an expansion chamber, a fixed interpolation pipe, a first transmission assembly, a second transmission assembly and a control system, one end of the main pipeline communicates with an upstream pipeline, and the other end of the main pipeline communicates with one end of the telescopic pipe; the other end of the telescopic pipe is communicated with one end of the movable inner insertion pipe, the other end of the movable inner insertion pipe is slidably inserted into one end of the expansion chamber, one end of the fixed inner insertion pipe is communicated with the other end of the expansion chamber, and the other end of the fixed inner insertion pipe is communicated with the downstream pipeline. The output end of the second transmission assembly penetrates through the expansion chamber and then is connected with the partition plate, and the control system is connected with the main pipeline, the first transmission assembly and the input end of the second transmission assembly. According to the design, the silencing frequency range is large, the reliability is high, and the working process is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of mufflers, and in particular to a frequency-adjustable internal expansion chamber muffler and a use method thereof. Background Art

[0002] The control method of contemporary pipeline noise generally starts from the noise source, propagation path and pipeline outlet. The main means of noise reduction is to install a silencer on the pipeline, that is, to reduce the noise from the propagation path. For example, the expansion chamber silencer uses the sudden expansion or contraction of the pipeline cross section to produce a sudden change in the acoustic impedance in the pipeline, so that the sound waves of certain frequencies propagating in the pipeline are reflected back to the sound source, thus achieving the purpose of noise reduction. Since the expansion chamber silencer has a simple structure, the expansion ratio of the expansion chamber determines the amount of noise reduction, and the noise reduction frequency is determined by the length of the expansion chamber. It can effectively reduce the noise within a certain frequency range. Therefore, the expansion chamber silencer is widely used in pipeline noise control. However, this kind of silencer with an expansion chamber is designed with the setting of structural parameters at the beginning, and its main noise reduction frequency range is also determined accordingly, which cannot be changed with the actual situation. If the frequency of the noise source changes, the noise reduction effect of the expansion chamber silencer under this working condition will be greatly reduced and cannot meet the working condition requirements. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects and problems of the muffler in the prior art that the muffler has a small muffler frequency range, and to provide an interpolated expansion chamber muffler with a large muffler frequency range and an adjustable frequency, and a method for using the same.

[0004] To achieve the above purpose, the technical solution of the present invention is: a frequency-adjustable internal insertion expansion chamber silencer, comprising a main pipeline, a telescopic tube, a mobile internal insertion tube, an expansion chamber, a fixed internal insertion tube, a first transmission assembly, a second transmission assembly and a control system, one end of the main pipeline is connected to an upstream pipeline, the other end of the main pipeline is connected to one end of the telescopic tube, the other end of the telescopic tube is connected to one end of the mobile internal insertion tube, the other end of the mobile internal insertion tube is slidably plugged into one end of the expansion chamber, one end of the fixed internal insertion tube is connected to the other end of the expansion chamber, and the other end of the fixed internal insertion tube is connected to a downstream pipeline, the output end of the first transmission assembly is connected to the outside of the mobile internal insertion tube, the inner side wall of the expansion chamber is provided with a partition, the output end of the second transmission assembly is connected to the partition after passing through the expansion chamber, and the control system is respectively connected to the input end of the first transmission assembly, the input end of the second transmission assembly and the main pipeline;

[0005] The first transmission assembly is used to control the movable inner tube to slide along the length direction of the expansion chamber;

[0006] The second transmission assembly is used to control the partition to slide along the height direction of the expansion chamber;

[0007] The control system is used to obtain the noise frequency in the main pipeline, and determine the adjustment resonance frequency of the expansion chamber according to the noise frequency, and adjust the insertion length of the movable inner tube in the expansion chamber by controlling the first transmission component, and adjust the position of the partition in the expansion chamber by controlling the second transmission component, so as to adjust the initial resonance frequency of the expansion chamber to be the same as the adjustment resonance frequency.

[0008] The first transmission assembly includes a first connecting rod, a first driving gear, a first driven gear, and a first stepper motor. The output shaft of the first stepper motor is connected to the first driving gear. The first driving gear and the first driven gear are wound with a first synchronous belt. One end of the first connecting rod is connected to one side of the first synchronous belt, and the other end of the first connecting rod is connected to the outer circumferential surface of the movable inner tube. The first stepper motor is connected to the control system.

[0009] Two first intercepting rods are provided on one side of the first synchronous belt. The two first intercepting rods are arranged radially relative to the first driving gear and the first driven gear respectively. The first connecting rod is located between the two first intercepting rods and is arranged perpendicular to the first intercepting rod.

[0010] The second transmission assembly includes a second connecting rod, a second driving gear, a second driven gear, a second stepping motor, a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. The output shaft of the second stepping motor is connected to the second driving gear. The second driving gear and the second driven gear are wound with a second synchronous belt. The second connecting rod is L-shaped. The transverse portion of the second connecting rod is connected to one side of the second synchronous belt. One end of the first connecting rod and the second connecting rod is hinged to the longitudinal portion of the second connecting rod. One end of the third connecting rod and the fourth connecting rod is hinged to the other end of the first connecting rod and the second connecting rod respectively. The center of the third connecting rod is hinged to the outer side wall of the expansion chamber. The center of the fourth connecting rod is hinged to the center of the third connecting rod. The other ends of the third connecting rod and the fourth connecting rod are located in the expansion chamber and abut against one side of the partition. The second stepping motor is connected to the control system.

[0011] Two second intercepting rods are provided on one side of the second synchronous belt, and the two second intercepting rods are respectively arranged radially relative to the second driving gear and the second driven gear. The transverse portion of the second connecting rod is located between the two second intercepting rods and is arranged perpendicular to the second intercepting rod.

[0012] A chassis is coaxially arranged at one end of the movable inner tube located in the expansion chamber, a plurality of first baffles are arranged at intervals along the circumferential direction on one side of the chassis, a plurality of second baffles are arranged at intervals along the circumferential direction on one side of the first baffle, and a plurality of the first baffles, the second baffles, and the chassis are surrounded to form a circular ring structure, a plurality of third transmission components are arranged on the outer circumferential surface of the movable inner tube, and the output ends of the plurality of the third transmission components are respectively connected to the plurality of the first baffles and the second baffles in a one-to-one correspondence;

[0013] The third transmission assembly is used to drive the first baffle plate and the second baffle plate to be connected to the chassis in a radially sliding manner along the movable inner tube.

[0014] The third transmission assembly includes a cylinder, a first push rod and a second push rod, a side wall of the movable inner tube is provided with a first cavity, a second cavity is provided inside the chassis, the first cavity is connected to the second cavity, a first slide groove is provided on the outer peripheral surface of the movable inner tube, a second slide groove is provided on a side of the chassis close to the first baffle, the first slide groove is connected to the first cavity, the second slide groove is connected to the second cavity, the first push rod and the second push rod are both L-shaped, the vertical part of the first push rod is slidably connected to the first slide groove, the transverse part of the first push rod is slidably connected to the first cavity, the output end of the cylinder is connected to the transverse part of the first push rod, the vertical part of the second push rod is slidably connected to the second cavity, the transverse part of the second push rod is slidably connected to the second slide groove, one end of the transverse part of the second push rod is connected to the first baffle and the second baffle, the first push rod, the second push rod, the movable inner tube, and the chassis are surrounded to form a sealed cavity, and the input end of the cylinder is connected to the control system.

[0015] The outer side of the movable inner insert tube is axially connected with a convex groove slide rail, one end of the expansion chamber is provided with a groove along the length direction, and the convex groove slide rail is slidably connected to the groove.

[0016] The control system includes an acoustic frequency signal detector, a signal amplifier, an A / D converter, a DSP controller, and a driver. The input end of the acoustic frequency signal detector is located inside the main pipeline after passing through the main pipeline, the output end of the acoustic frequency signal detector is connected to the input end of the signal amplifier, the output end of the signal amplifier is connected to the input end of the A / D converter, the output end of the A / D converter is connected to the input end of the DSP controller, the output end of the DSP controller is connected to the input end of the driver, and the output end of the driver is connected to the first transmission component and the second transmission component.

[0017] A method for using a frequency-adjustable internal expansion chamber silencer, the method comprising the following steps:

[0018] Step 1: After the acoustic frequency signal detector detects the acoustic signal in the main pipeline, it converts the acoustic signal into an analog signal through a signal amplifier and transmits it to the A / D converter. The A / D converter converts the analog signal into a digital signal and transmits it to the DSP controller;

[0019] Step 2: The DSP controller compares the acquired digital signal with the preset digital signal, calculates the adjustment resonance frequency of the expansion chamber, and determines the adjustment amount of the expansion chamber structural parameters according to the adjustment resonance frequency;

[0020] Step three: The DSP controller connects the adjustment quantity instruction of the expansion chamber structural parameters to the driver. The driver adjusts the insertion length of the movable inner tube in the expansion chamber by controlling the first transmission component, and adjusts the position of the partition in the expansion chamber by controlling the second transmission component to adjust the initial resonance frequency of the expansion chamber to the same as the adjustment resonance frequency. At this time, the driver stops working.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the frequency-adjustable interpolation expansion chamber silencer and its use method of the present invention, the direction of the noise is monitored in real time by a control system, and the first transmission assembly and the second transmission assembly are controlled by the control system at the same time, and the resonance frequency of the silencer is changed by changing the interpolation length of the inner insert tube in the expansion chamber and the volume of the expansion chamber, so that the silencer frequency band of the silencer can correspond to the frequency of the noise without replacing any silencer element, thus overcoming the problem of the single silencer frequency of the traditional reactive silencer, and being applicable to the silencer of noises of different frequencies, and having a large silencer frequency range. Therefore, the silencer frequency range of the present invention is large and has a wide range of application.

[0023] 2. In the frequency-adjustable interpolation expansion chamber silencer and its use method of the present invention, the first transmission assembly adopts a gear transmission mode, and the first stepper motor drives the first driving gear to rotate, thereby driving the first connecting rod to move. Since the first connecting rod is connected to the mobile interpolation tube, it will drive the mobile interpolation tube to move in the expansion chamber, thereby changing the interpolation length of the interpolation tube in the expansion chamber; by setting the first interception rod, the first connecting rod is prevented from exceeding the moving range due to inertia. Therefore, the present invention has high reliability and stable working process.

[0024] 3. In the frequency-adjustable interpolation expansion chamber muffler and its use method of the present invention, the second transmission assembly adopts a gear transmission method, and the second stepping motor drives the second driving gear to rotate, thereby driving the second connecting rod to move. The second connecting rod and the partition plate adopt a connecting rod transmission method, and the partition plate can be driven to move on the inner wall of the expansion chamber by moving the second connecting rod, thereby changing the volume of the expansion chamber; by setting a second intercepting rod, the second connecting rod is prevented from exceeding the moving range due to inertia. Therefore, the present invention has high reliability and stable working process.

[0025] 4. In the frequency-adjustable internal expansion chamber silencer and its use method of the present invention, a chassis is provided, and a first baffle and a second baffle are slidably connected to the chassis, and the first push rod is pushed to move by a cylinder. Since there is a closed cavity between the first push rod and the second push rod, the second push rod will move synchronously, so that the first baffle and the second baffle are unfolded, so as to facilitate the adjustment of the cross-sectional area of ​​the mobile internal insert tube and increase the silencer frequency range; by providing a groove and a convex groove slide rail, the mobile internal insert tube can be prevented from rotating during the movement process, resulting in the mobile internal insert tube being stuck during the movement process. Therefore, the present invention has high reliability and a large silencer frequency range. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a partial structural schematic diagram of the first transmission component in the present invention.

[0028] Figure 3 It is a partial structural schematic diagram of the second transmission assembly in the present invention.

[0029] Figure 4 It is a partial structural schematic diagram of the expansion chamber and the second transmission assembly in the present invention.

[0030] Figure 5 It is a partial structural schematic diagram of the third transmission assembly in the present invention.

[0031] Figure 6 It is a cross-sectional schematic diagram of the movable inner insert pipe and the chassis in the present invention.

[0032] Figure 7 yes Figure 6 A magnified schematic diagram of center A.

[0033] Figure 8 yes Figure 6 A magnified schematic diagram of point B in the middle.

[0034] Fig. 9 yes Figure 6 Enlarged schematic diagram of point C in the middle.

[0035] Fig.10 It is a structural schematic diagram of the expansion chamber and the movable inner cannula in the present invention.

[0036] Fig.11 It is a structural schematic diagram of the expansion chamber in the present invention.

[0037] Fig.12 It is a structural block diagram of the control system in the present invention.

[0038] In the figure: upstream pipeline 1, main pipeline 2, telescopic pipe 3, movable inner tube 4, chassis 41, first baffle 42, second baffle 43, third transmission assembly 44, cylinder 441, first push rod 442, second push rod 443, first cavity 45, first slide groove 46, second cavity 47, second slide groove 48, sealing cavity 49, convex groove slide rail 410, expansion chamber 5, groove 51, fixed inner tube 6, first transmission assembly 7, first connecting rod 71, first driving gear 72, first driven gear 73, first synchronous belt 74, first stepper motor 75, first intercepting rod 76, second transmission assembly 8, second connecting rod 81, second driving gear 82, second driven gear 83, second synchronous belt 84, second stepper motor 85, first connecting rod 86, second connecting rod 87, third connecting rod 88, fourth connecting rod 89, second intercepting rod 810, control system 9, acoustic frequency signal detector 91, signal amplifier 92, A / D converter 93, DSP controller 94, driver 95, downstream pipeline 10, flange 11, partition 12. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Embodiment 1:

[0041] See also Figures 1 to 12 , a frequency-adjustable internal insertion expansion chamber silencer, comprising a main pipeline 2, a telescopic tube 3, a mobile internal insertion tube 4, an expansion chamber 5, a fixed internal insertion tube 6, a first transmission component 7, a second transmission component 8 and a control system 9, one end of the main pipeline 2 is connected to the upstream pipeline 1, the other end of the main pipeline 2 is connected to one end of the telescopic tube 3, the other end of the telescopic tube 3 is connected to one end of the mobile internal insertion tube 4, the other end of the mobile internal insertion tube 4 is slidably plugged into one end of the expansion chamber 5, one end of the fixed internal insertion tube 6 is connected to the other end of the expansion chamber 5, and the other end of the fixed internal insertion tube 6 is connected to a downstream pipeline 10, the output end of the first transmission component 7 is connected to the outside of the mobile internal insertion tube 4, the inner side wall of the expansion chamber 5 is provided with a partition 12, the output end of the second transmission component 8 is connected to the partition 12 after passing through the expansion chamber 5, and the control system 9 is respectively connected to the input end of the first transmission component 7, the input end of the second transmission component 8, and the main pipeline 2;

[0042] The first transmission assembly 7 is used to control the movable inner tube 4 to slide along the length direction of the expansion chamber 5;

[0043] The second transmission assembly 8 is used to control the partition plate 12 to slide along the height direction of the expansion chamber 5;

[0044] The control system 9 is used to obtain the noise frequency in the main pipeline 2, and determine the adjustment resonance frequency of the expansion chamber 5 according to the noise frequency, and adjust the insertion length of the movable inner tube 4 in the expansion chamber 5 by controlling the first transmission component 7, and adjust the position of the partition 12 in the expansion chamber 5 by controlling the second transmission component 8, so as to adjust the initial resonance frequency of the expansion chamber 5 to be the same as the adjustment resonance frequency.

[0045] The control system 9 includes an acoustic frequency signal detector 91, a signal amplifier 92, an A / D converter 93, a DSP controller 94, and a driver 95. The input end of the acoustic frequency signal detector 91 passes through the main pipeline 2 and is located inside the main pipeline 2. The output end of the acoustic frequency signal detector 91 is connected to the input end of the signal amplifier 92. The output end of the signal amplifier 92 is connected to the input end of the A / D converter 93. The output end of the A / D converter 93 is connected to the input end of the DSP controller 94. The output end of the DSP controller 94 is connected to the input end of the driver 95. The output end of the driver 95 is connected to the first transmission component 7 and the second transmission component 8.

[0046] A method for using a frequency-adjustable internal expansion chamber silencer, the method comprising the following steps:

[0047] Step 1: After the acoustic frequency signal detector 91 detects the acoustic signal in the main pipe 2, the acoustic signal is converted into an analog signal through the signal amplifier 92 and transmitted to the A / D converter 93. The A / D converter 93 converts the analog signal into a digital signal and transmits it to the DSP controller 94;

[0048] Step 2: The DSP controller 94 compares the acquired digital signal with the preset digital signal to calculate the adjustment resonance frequency of the expansion chamber 5, and determines the adjustment amount of the structural parameters of the expansion chamber 5 according to the adjustment resonance frequency;

[0049] Step three: The DSP controller 94 connects the adjustment quantity instruction of the structural parameters of the expansion chamber 5 to the driver 95. The driver 95 adjusts the insertion length of the movable inner tube 4 in the expansion chamber 5 by controlling the first transmission component 7, and adjusts the position of the partition 12 in the expansion chamber 5 by controlling the second transmission component 8, so as to adjust the initial resonance frequency of the expansion chamber 5 to be the same as the adjustment resonance frequency. At this time, the driver 95 stops working.

[0050] In this embodiment, the initial resonance frequency of the expansion chamber 5 refers to the resonance frequency calculated based on the various structural parameters of the expansion chamber 5 in the current state when it has not been adjusted. The adjusted resonance frequency of the expansion chamber 5 is the resonance frequency with the best sound absorption effect calculated based on the noise in the current main pipeline 2.

[0051] The specific formula for calculating and adjusting the structural parameters of the expansion chamber 5 is:

[0052]

[0053] Among them, f0 is the resonance frequency of the expansion chamber 5, c is the sound velocity of the noise, S is the cross-sectional area of ​​the movable inner tube 4, I is the interpolation length of the movable inner tube 4 in the expansion chamber 5, and V is the volume of the expansion chamber 5.

[0054] Embodiment 2:

[0055] The basic content is the same as that of Example 1, except that:

[0056] The first transmission assembly 7 includes a first connecting rod 71, a first driving gear 72, a first driven gear 73, and a first stepper motor 75. The output shaft of the first stepper motor 75 is connected to the first driving gear 72. The first driving gear 72 and the first driven gear 73 are wound with a first synchronous belt 74. One end of the first connecting rod 71 is connected to one side of the first synchronous belt 74, and the other end of the first connecting rod 71 is connected to the outer circumferential surface of the movable inner tube 4. The first stepper motor 75 is connected to the control system 9. Two first intercepting rods 76 are provided on one side of the first synchronous belt 74. The two first intercepting rods 76 are respectively arranged radially relative to the first driving gear 72 and the first driven gear 73. The first connecting rod 71 is located between the two first intercepting rods 76 and is arranged perpendicular to the first intercepting rod 76.

[0057] In this embodiment, the driver 95 controls the first stepper motor 75 to work. The first stepper motor 75 rotates to drive the first driving gear 72 to rotate. The first driving gear 72 rotates to drive the first synchronous belt 74 to move, so that the first connecting rod 71 moves synchronously. The first connecting rod 71 drives the mobile inner tube 4 to move in the expansion chamber 5.

[0058] Embodiment 3:

[0059] The basic content is the same as that of Example 1, except that:

[0060] The second transmission assembly 8 includes a second connecting rod 81, a second driving gear 82, a second driven gear 83, a second stepping motor 85, a first connecting rod 86, a second connecting rod 87, a third connecting rod 88 and a fourth connecting rod 89. The output shaft of the second stepping motor 85 is connected to the second driving gear 82. The second driving gear 82 and the second driven gear 83 are wound with a second synchronous belt 84. The second connecting rod 81 is L-shaped. The transverse portion of the second connecting rod 81 is connected to one side of the second synchronous belt 84. One ends of the first connecting rod 86 and the second connecting rod 87 are both hinged to the longitudinal portion of the second connecting rod 81. One ends of the third connecting rod 88 and the fourth connecting rod 89 are respectively hinged to the first connecting rod 86, The other end of the second connecting rod 87 and the center of the third connecting rod 88 are hinged to the outer wall of the expansion chamber 5, and the center of the fourth connecting rod 89 is hinged to the center of the third connecting rod 88. The other ends of the third connecting rod 88 and the fourth connecting rod 89 are located in the expansion chamber 5 and abut against one side of the partition 12. The second stepper motor 85 is connected to the control system 9. Two second intercepting rods 810 are provided on one side of the second synchronous belt 84. The two second intercepting rods 810 are respectively arranged radially relative to the second driving gear 82 and the second driven gear 83. The transverse portion of the second connecting rod 81 is located between the two second intercepting rods 810 and is arranged perpendicular to the second intercepting rod 810.

[0061] In this embodiment, the driver 95 controls the second stepper motor 85 to work. The second stepper motor 85 rotates to drive the second driving gear 82 to rotate. The second driving gear 82 rotates to drive the second synchronous belt 84 to move, so that the second connecting rod 81 moves synchronously. The second connecting rod 81 drives the first connecting rod 86 and the second connecting rod 87 to rotate around the end of the second connecting rod 81. At the same time, the third connecting rod 88 and the fourth connecting rod 89 rotate synchronously, so that the third connecting rod 88 and the fourth connecting rod 89 move and push the partition 12 to move in the expansion chamber 5.

[0062] Embodiment 4:

[0063] The basic content is the same as that of Example 1, except that:

[0064] A chassis 41 is coaxially arranged at one end of the movable inner tube 4 located in the expansion chamber 5, a plurality of first baffles 42 are arranged at intervals along the circumferential direction on one side of the chassis 41, a plurality of second baffles 43 are arranged at intervals along the circumferential direction on one side of the first baffle 42, a plurality of first baffles 42, second baffles 43 and chassis 41 are surrounded to form a circular ring structure, a plurality of third transmission components 44 are arranged on the outer circumferential surface of the movable inner tube 4, and the output ends of the plurality of third transmission components 44 are respectively connected to the plurality of first baffles 42 and second baffles 43 in a one-to-one correspondence;

[0065] The third transmission assembly 44 is used to drive the first baffle plate 42 and the second baffle plate 43 to be connected to the chassis 41 along the radial sliding direction of the movable inner tube 4. The third transmission assembly 44 includes a cylinder 441, a first push rod 442 and a second push rod 443. The side wall of the movable inner tube 4 is provided with a first cavity 45, and the interior of the chassis 41 is provided with a second cavity 47. The first cavity 45 is connected to the second cavity 47. The outer peripheral surface of the movable inner tube 4 is provided with a first slide groove 46. The side of the chassis 41 close to the first baffle plate 42 is provided with a second slide groove 48. The first slide groove 46 is connected to the first cavity 45, and the second slide groove 48 is connected to the second cavity 47. The first The push rod 442 and the second push rod 443 are both L-shaped, the vertical portion of the first push rod 442 is slidably connected to the first slide groove 46, the horizontal portion of the first push rod 442 is slidably connected to the first cavity 45, the output end of the cylinder 441 is connected to the horizontal portion of the first push rod 442, the vertical portion of the second push rod 443 is slidably connected to the second cavity 47, the horizontal portion of the second push rod 443 is slidably connected to the second slide groove 48, one end of the horizontal portion of the second push rod 443 is connected to the first baffle 42 and the second baffle 43, the first push rod 442, the second push rod 443, the movable inner tube 4, and the chassis 41 are surrounded to form a sealed cavity 49, and the input end of the cylinder 441 is connected to the control system 9. The outer side of the movable inner tube 4 is axially connected to a convex groove slide rail 410, one end of the expansion chamber 5 is provided with a groove 51 along the length direction, and the convex groove slide rail 410 is slidably connected to the groove 51.

[0066] In this embodiment, when it is necessary to adjust the silencer frequency of the silencer device, the cylinder 441 is controlled by the driver 95 to move the first push rod 442 and drive the second push rod 443 to move. The movement of the second push rod 443 drives the first baffle 42 and the second baffle 43 to slide radially outward along the movable inner tube 4, so that the cross-sectional area of ​​the movable inner tube 4 changes, thereby realizing the change of the silencer frequency.

Claims

1. A frequency-adjustable internal expansion chamber muffler, characterized in that: The invention comprises a main pipeline (2), a telescopic tube (3), a movable inner tube (4), an expansion chamber (5), a fixed inner tube (6), a first transmission assembly (7), a second transmission assembly (8) and a control system (9), wherein one end of the main pipeline (2) is connected to an upstream pipeline (1), the other end of the main pipeline (2) is connected to one end of the telescopic tube (3), the other end of the telescopic tube (3) is connected to one end of the movable inner tube (4), the other end of the movable inner tube (4) is slidably plugged into one end of the expansion chamber (5), and the fixed inner tube (6) is connected to the upstream pipeline (1). ) is connected to the other end of the expansion chamber (5), the other end of the fixed inner tube (6) is connected to the downstream pipeline (10), the output end of the first transmission component (7) is connected to the outside of the movable inner tube (4), the inner wall of the expansion chamber (5) is provided with a partition (12), the output end of the second transmission component (8) passes through the expansion chamber (5) and is connected to the partition (12), and the control system (9) is respectively connected to the input end of the first transmission component (7), the input end of the second transmission component (8) and the main pipeline (2); The first transmission assembly (7) is used to control the movable inner tube (4) to slide along the length direction of the expansion chamber (5); The second transmission assembly (8) is used to control the partition plate (12) to slide along the height direction of the expansion chamber (5); The control system (9) is used to obtain the noise frequency in the main pipeline (2), determine the adjustment resonance frequency of the expansion chamber (5) according to the noise frequency, and adjust the insertion length of the movable inner tube (4) in the expansion chamber (5) by controlling the first transmission component (7), and adjust the position of the partition (12) in the expansion chamber (5) by controlling the second transmission component (8), so as to adjust the initial resonance frequency of the expansion chamber (5) to be the same as the adjustment resonance frequency.

2. The frequency-adjustable internal expansion chamber muffler according to claim 1, characterized in that: The first transmission assembly (7) comprises a first connecting rod (71), a first driving gear (72), a first driven gear (73), and a first stepper motor (75); the output shaft of the first stepper motor (75) is connected to the first driving gear (72); the first driving gear (72) and the first driven gear (73) are wound with a first synchronous belt (74); one end of the first connecting rod (71) is connected to one side of the first synchronous belt (74); the other end of the first connecting rod (71) is connected to the outer peripheral surface of the movable inner tube (4); and the first stepper motor (75) is connected to the control system (9).

3. The frequency-adjustable internal expansion chamber muffler device according to claim 2, characterized in that: Two first intercepting rods (76) are arranged on one side of the first synchronous belt (74), and the two first intercepting rods (76) are respectively arranged radially relative to the first driving gear (72) and the first driven gear (73), and the first connecting rod (71) is located between the two first intercepting rods (76) and is arranged perpendicular to the first intercepting rod (76).

4. The frequency-adjustable internal expansion chamber muffler device according to claim 1, characterized in that: The second transmission assembly (8) comprises a second connecting rod (81), a second driving gear (82), a second driven gear (83), a second stepping motor (85), a first connecting rod (86), a second connecting rod (87), a third connecting rod (88) and a fourth connecting rod (89); the output shaft of the second stepping motor (85) is connected to the second driving gear (82); the second driving gear (82) and the second driven gear (83) are wound with a second synchronous belt (84); the second connecting rod (81) is L-shaped; the transverse portion of the second connecting rod (81) is connected to one side of the second synchronous belt (84); the first connecting rod (86 ... the second driving gear (84); the second driving gear (82) and the second driven gear (83) are wound with a second synchronous belt (84); the second connecting rod (81) is L-shaped; the second driving gear (82) and the second driven gear (83) are L-shaped; the second driving gear (82) and the second driven gear (83) are L-shaped; the second ), one end of the second connecting rod (87) is hinged to the longitudinal part of the second connecting rod (81), one end of the third connecting rod (88) and the fourth connecting rod (89) are hinged to the other end of the first connecting rod (86) and the second connecting rod (87) respectively, the center of the third connecting rod (88) is hinged to the outer wall of the expansion chamber (5), the center of the fourth connecting rod (89) is hinged to the center of the third connecting rod (88), the other ends of the third connecting rod (88) and the fourth connecting rod (89) are located in the expansion chamber (5) and abut against one side of the partition (12), and the second stepping motor (85) is connected to the control system (9).

5. The frequency-adjustable internal expansion chamber muffler device according to claim 4, characterized in that: Two second intercepting rods (810) are provided on one side of the second synchronous belt (84), and the two second intercepting rods (810) are respectively arranged radially relative to the second driving gear (82) and the second driven gear (83), and the transverse portion of the second connecting rod (81) is located between the two second intercepting rods (810) and is arranged perpendicular to the second intercepting rod (810).

6. The frequency-adjustable internal expansion chamber muffler device according to claim 1, characterized in that: A chassis (41) is coaxially arranged at one end of the movable inner tube (4) located in the expansion chamber (5); a plurality of first baffles (42) are arranged at intervals along the circumferential direction on one side of the chassis (41); a plurality of second baffles (43) are arranged at intervals along the circumferential direction on one side of the first baffle (42); a plurality of first baffles (42), second baffles (43) and chassis (41) are surrounded together to form a circular ring structure; a plurality of third transmission components (44) are arranged on the outer circumferential surface of the movable inner tube (4); output ends of the plurality of third transmission components (44) are respectively connected to the plurality of first baffles (42) and second baffles (43) in a one-to-one correspondence; The third transmission assembly (44) is used to drive the first baffle plate (42) and the second baffle plate (43) to be slidably connected to the chassis (41) along the radial direction of the movable inner tube (4).

7. The frequency-adjustable internal expansion chamber muffler device according to claim 6, characterized in that: The third transmission assembly (44) comprises a cylinder (441), a first push rod (442) and a second push rod (443); a first cavity (45) is provided on the side wall of the movable inner tube (4); a second cavity (47) is provided inside the chassis (41); the first cavity (45) is communicated with the second cavity (47); a first slide groove (46) is provided on the outer peripheral surface of the movable inner tube (4); a second slide groove (48) is provided on a side of the chassis (41) close to the first baffle (42); the first slide groove (46) is communicated with the first cavity (45); the second slide groove (48) is communicated with the second cavity (47); the first push rod (442) and the second push rod (443) are both L-shaped; the first push rod (44 2) is slidably connected to the first slide groove (46), the transverse part of the first push rod (442) is slidably connected to the first cavity (45), the output end of the cylinder (441) is connected to the transverse part of the first push rod (442), the vertical part of the second push rod (443) is slidably connected to the second cavity (47), the transverse part of the second push rod (443) is slidably connected to the second slide groove (48), one end of the transverse part of the second push rod (443) is connected to the first baffle plate (42) and the second baffle plate (43), the first push rod (442), the second push rod (443), the movable inner tube (4) and the chassis (41) are surrounded to form a sealed cavity (49), and the input end of the cylinder (441) is connected to the control system (9).

8. The frequency-adjustable internal expansion chamber muffler device according to claim 6, characterized in that: The outer side of the movable inner tube (4) is axially connected with a convex groove slide rail (410), one end of the expansion chamber (5) is provided with a groove (51) along the length direction, and the convex groove slide rail (410) is slidably connected to the groove (51).

9. The frequency-adjustable internal expansion chamber muffler device according to claim 1, characterized in that: The control system (9) comprises an acoustic frequency signal detector (91), a signal amplifier (92), an A / D converter (93), a DSP controller (94), and a driver (95). The input end of the acoustic frequency signal detector (91) passes through the main pipeline (2) and is located in the main pipeline (2). The output end of the acoustic frequency signal detector (91) is connected to the input end of the signal amplifier (92). The output end of the signal amplifier (92) is connected to the input end of the A / D converter (93). The output end of the A / D converter (93) is connected to the input end of the DSP controller (94). The output end of the DSP controller (94) is connected to the input end of the driver (95). The output end of the driver (95) is connected to the first transmission component (7) and the second transmission component (8).

10. A method for using the frequency-adjustable interpolation expansion chamber muffler according to claim 9, characterized in that: The method of use comprises the following steps: Step 1: After the acoustic frequency signal detector (91) detects the acoustic signal in the main pipeline (2), the acoustic signal is converted into an analog signal through the signal amplifier (92) and transmitted to the A / D converter (93). The A / D converter (93) converts the analog signal into a digital signal and transmits it to the DSP controller (94); Step 2: The DSP controller (94) compares the acquired digital signal with a preset digital signal to calculate the adjustment resonance frequency of the expansion chamber (5), and determines the adjustment amount of the structural parameters of the expansion chamber (5) according to the adjustment resonance frequency; Step three: The DSP controller (94) connects the adjustment quantity instruction of the structural parameters of the expansion chamber (5) to the driver (95). The driver (95) adjusts the insertion length of the movable inner tube (4) in the expansion chamber (5) by controlling the first transmission component (7), and adjusts the position of the partition (12) in the expansion chamber (5) by controlling the second transmission component (8) to adjust the initial resonance frequency of the expansion chamber (5) to the same as the adjustment resonance frequency. At this time, the driver (95) stops working.

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