A composite muffler for a ventilator system

Abstract

The application discloses a composite muffler of a ventilator system and belongs to the technical field of mufflers, which comprises a shell, air inlets and air outlets are respectively arranged on the two sides of the shell, and expansion assemblies are arranged on the sides of the air inlets and the air outlets. In the application, the product can reduce the flow speed of the straight-through through hole, reduce turbulent noise and pressure loss by shunting high-speed airflow through auxiliary exhaust holes, the auxiliary cavity in the resistance unit can absorb part of high-frequency turbulent noise, and the regenerative noise of the straight-through through hole is reduced, the driving motor drives the rotating shaft and the gear to rotate, the rack drives the mounting block, the horizontal plate, the connecting block and the concave seat to move, the length of the auxiliary cavity in the resistance unit is adjusted, the airflow stability is enhanced, the vortex shedding noise is reduced, the resonance frequency is reduced, the low-frequency noise under high speed is inhibited, the product forms multimodal resonance, and the overall use effect of the product is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of muffler, and particularly relates to a composite muffler of a ventilator system. BACKGROUND

[0002] The muffler is a device for preventing sound propagation and allowing airflow, and is an important measure for eliminating aerodynamic noise. The composite muffler refers to a structure composed of resistance and resistance principles, and is widely used in ventilator systems due to its adaptability to complex noise environments.

[0003] A new impedance composite muffler disclosed in Chinese patent document (CN105927315B) has a built-in resistance muffler which utilizes a resistance sound-absorbing material attached to the wall of a rigid pipeline through which sound waves propagate. The material allows most high-frequency sound waves to enter the material, thereby gradually consuming the sound waves. The resistance muffler has a good effect on high-frequency noise. The built-in resistance muffler mainly bypasses a resonance cavity on the pipeline or causes a sudden change in the area of the pipeline. The resistance muffler has selectivity for sound waves of different frequencies, causing reflection and interference of sound waves in the pipeline. The resistance muffler has a good effect on low- and medium-frequency noise. The muffler has the functions of resistance and resistance mufflers and has a good control effect on exhaust noise of various frequency bands. However, the noise characteristics of the muffler are different when the flow rate of gas in the pipeline changes. The muffler cannot achieve the best noise reduction effect according to the change in noise frequency in a complex noise environment. Therefore, the muffler needs to be improved. SUMMARY

[0004] The present application aims to solve the problem that the noise reduction parameters of the prior art are fixed during use, the noise characteristics are different when the flow rate of gas in the pipeline changes, and it is inconvenient to achieve the best noise reduction effect according to the change in noise frequency in a complex noise environment. A composite muffler of a ventilator system is provided.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A composite muffler of a ventilator system includes a shell, an air inlet and an air outlet are formed on both sides of the shell, an expansion assembly is arranged on one side of the air inlet and the air outlet, a resistance unit, a resonance pipeline and a resistance unit are arranged between the air inlet and the air outlet, an expansion assembly is arranged in the resistance unit, and an adjustment assembly is arranged on one side of the expansion assembly.

[0007] The expansion assembly comprises two concave seats slidingly sealed in the resistance unit, a plurality of connecting through holes are linearly arranged on opposite sides of the two concave seats, connecting blocks are fixedly connected to the outer sides of the two concave seats, a horizontal plate is fixedly connected to the other side of each connecting block, a mounting block is fixedly connected to the outer side of the horizontal plate, a rack is fixedly connected to one side of the mounting block, and the rack drives the concave seat to move to adjust the expansion of the auxiliary sound attenuation cavity in the resistance unit.

[0008] As a further description of the above technical solution:

[0009] One side of the concave seat is tapered, grooves are formed on the outer sides of the resistance unit, and symmetrical sliding grooves are formed on the inner sides of the resistance unit, the sliding grooves are connected to the grooves, the connecting blocks are slidingly connected in the sliding grooves, and the horizontal plates are slidingly sealed in the sliding grooves, the rack is slidingly connected in the resistance unit through a rectangular sliding block and a rectangular sliding groove, a gear is engagedly connected to one side of the bottom of the rack, a driving motor is fixedly connected to one side of the gear through a rotating shaft, and the other side of the driving motor is fixedly connected to the inner wall of the shell.

[0010] As a further description of the above technical solution:

[0011] A straight-through through hole is formed on the side of the resistance unit opposite to the air inlet, auxiliary exhaust holes are arranged on the two sides of the straight-through through hole and in the resistance unit, a rectangular sliding hole is formed on the other side of the resistance unit, a sliding block is fixedly connected to one side of the concave seat, the sliding block is slidingly sealed in the rectangular sliding hole, and the sliding block and the inner circumferential side of the concave seat are arranged on the same plane.

[0012] As a further description of the above technical solution:

[0013] The adjusting assembly comprises two connecting boxes, the opposite sides of the two connecting boxes are fixedly connected to the inner walls of the resonance pipes, the resonance pipes are arranged in the resistance unit, a neck groove is arranged between the two connecting boxes, the neck groove is connected to the resistance unit, neck blocks are arranged on the two sides of the neck groove, and the neck blocks are slidingly sealed in the connecting boxes.

[0014] As a further description of the above technical solution:

[0015] The opposite sides of the two neck blocks are fixedly connected to sliding plates, the sliding plates are slidingly connected in the connecting boxes, the other sides of the sliding plates are fixedly connected to springs, the other sides of the springs are fixedly connected to the inner walls of the connecting boxes, the top of each neck block is provided with a secondary liquid bag, the two sides of the secondary liquid bag are fixedly connected to one side of the sliding plate and the inner wall of the connecting box, one side of the secondary liquid bag is connected to a liquid delivery pipe, the other end of the liquid delivery pipe is connected to a primary liquid bag, and the two sides of the primary liquid bag are fixedly connected to the mounting block and the outer wall of the resistance unit.

[0016] As a further description of the above technical solutions:

[0017] The expansion assembly comprises fixed nodes, both of which are fixedly connected with the outer wall of the shell on one side, a plurality of telescopic nodes are slidingly sealed in the fixed nodes, and movable nodes are slidingly sealed in the telescopic nodes.

[0018] As a further description of the above technical solutions:

[0019] Both sides of the fixed node are fixedly connected with a fixed box, a fixed shaft is rotatably connected in the fixed box, the top end of the fixed shaft extends to the outside of the fixed box and is fixedly connected with a handle, and a limiting module is arranged on the outer periphery of the fixed shaft.

[0020] As a further description of the above technical solutions:

[0021] The bottom end of the fixed shaft is fixedly connected with a first bevel gear, one side of the first bevel gear is meshingly connected with a second bevel gear, a connecting shaft is fixedly connected in the second bevel gear, the connecting shaft is rotatably connected in the fixed box, one end of the connecting shaft extends to the outside of the fixed box and is fixedly connected with a lead screw, a fixed block is rotatably connected on the side of the connecting shaft away from the second bevel gear, and one side of the fixed block is fixedly connected with the outer wall of the fixed node.

[0022] As a further description of the above technical solutions:

[0023] The outer periphery of the lead screw is provided with an adjusting seat through a lead screw seat, one side of the adjusting seat is fixedly connected with the outer wall of the movable node, a plurality of intermediate seats are arranged between the adjusting seat and the fixed block, and the intermediate seats are slidingly connected on the outer periphery of the lead screw.

[0024] As a further description of the above technical solutions:

[0025] One side of the inside of the adjusting seat, the fixed block and the intermediate seat is provided with a circular through hole, a limiting rod is arranged in the circular through hole, one end of the limiting rod is fixedly connected with the outer wall of the fixed box, the limiting rod is fixedly connected in the fixed block, and the limiting rod is slidingly connected in the adjusting seat and the intermediate seat, one side of the outside of the adjusting seat, the fixed block and the intermediate seat is fixedly connected with a connecting rod, and a connecting rod unit is arranged on the connecting rod.

[0026] As described above, due to the adoption of the above technical solutions, the beneficial effects of the present application are:

[0027] 1. In the present invention, by setting the expansion component, when the sensor detects that the wind speed of the external fan system is low, the airflow mainly enters the resistance unit through the straight through-holes inside the resistance unit. The resonant pipe will process the low-frequency noise in the low-speed airflow, and the resistance unit will process the medium and high-frequency noise in the low-speed airflow. The straight through-holes provide a main passage with low resistance for the airflow, avoiding the formation of vortex or retention of airflow in the resistance unit, reducing pressure loss, and having a weak diversion effect, so that the overall flow velocity distribution of the product is more uniform. When the sensor detects that the wind speed of the external fan system is high, the auxiliary holes on both sides begin to divert the airflow due to the increase in pressure difference, and part of the airflow will pass through the auxiliary The air is transported to the auxiliary processing chamber opened inside the resistance unit through the auxiliary holes. This product diverts high-speed airflow through the auxiliary holes, reduces the flow velocity of the straight-through holes, reduces turbulent noise and pressure loss, and the auxiliary chamber inside the resistance unit can absorb part of the high-frequency turbulent noise, reduce the regeneration noise of the straight-through holes, and make the drive motor drive the shaft and gear to rotate, so that the rack drives the mounting block, cross plate, connecting block and concave seat to move, so as to adjust the length of the auxiliary chamber inside the resistance unit, which can enhance the stability of the airflow, reduce the eddy shedding noise, and help reduce its resonant frequency, thereby helping to suppress low-frequency noise at high speed, so that the product forms multi-modal resonance, thereby effectively improving the overall use effect of the product.

[0028] 2. In the present invention, through the setting of the adjustment component, the mounting block will transport the liquid inside the main liquid sac to the auxiliary liquid sac during the movement, causing the auxiliary liquid sac to expand and drive the sliding plate and the neck block to move. The use width of the neck groove is adjusted, which can reduce the flow rate of high-speed airflow through the neck and reduce the vortex shedding noise. The expansion of the neck groove reduces the local resistance coefficient of the airflow and reduces the pressure loss of the resonant pipe during use. This product effectively improves the stability of the system through adaptive variable working condition silencer.

[0029] 3. In the present invention, through the provision of an expansion component, the staff can manually operate the handle to drive the fixed shaft, the first bevel gear, the second bevel gear, the connecting shaft and the screw to rotate, so that the screw seat drives the adjustment seat to move, and during the movement of the adjustment seat, the intermediate seat will drive the movement of the outer peripheral side of the screw through the connecting rod and the connecting rod unit, so that the intermediate seat drives the telescopic joint to expand, thereby improving the installation portability of the product. Through the provision of an integral telescopic conical guide joint, the axial length of the product can be easily adjusted, which can adapt to different installation spacings, reduce the requirements for pipeline centering accuracy, simplify the installation process, and the conical guide joint helps to improve the distribution uniformity of the airflow entering the muffler and reduce local resistance loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 2It is the whole stereoscopic structure schematic diagram of the expansion assembly in the application;

[0032] Figure 3 It is the partial stereoscopic structure schematic diagram of the expansion assembly in the application;

[0033] Figure 4 It is the whole stereoscopic structure schematic diagram of the resistance unit and the resistance unit in the application Figure 3 It is the partial enlarged structure schematic diagram of A in the application

[0034] Figure 5 It is the internal stereoscopic structure schematic diagram of the shell in the application;

[0035] Figure 6 It is the partial enlarged structure schematic diagram of B in the application Figure 5

[0036] Figure 7 It is the whole stereoscopic structure schematic diagram of the resistance unit and the resistance unit in the application;

[0037] Figure 8 It is the partial enlarged structure schematic diagram of C in the application Figure 7

[0038] Figure 9 It is the internal stereoscopic structure schematic diagram of the resistance unit in the application;

[0039] Figure 10 It is the partial enlarged structure schematic diagram of D in the application Figure 9

[0040] Figure 11 It is the partial stereoscopic structure schematic diagram of the resistance unit in the application.

[0041] Legend:

[0042] 1, shell; 2, air inlet; 3, air outlet; 4, expansion assembly; 401, fixed section; 402, telescopic section; 403, movable section; 404, fixed box; 405, fixed shaft; 406, handle; 407, first bevel gear; 408, second bevel gear; 409, connecting shaft; 410, fixed block; 411, lead screw; 412, adjusting seat; 413, intermediate seat; 414, connecting rod; 415, connecting rod unit; 5, resonance pipeline; 6, resistance unit; 7, expansion assembly; 701, driving motor; 702, gear; 703, rack; 704, mounting block; 705, cross plate; 706, connecting block; 707, concave seat; 708, connecting through hole; 709, sliding block; 8, resistance unit; 9, adjusting assembly; 901, connecting box; 902, spring; 903, sliding plate; 904, neck block; 905, neck groove; 906, auxiliary liquid bag; 907, infusion tube; 908, main liquid bag. DETAILED DESCRIPTION ​​​

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0044] Please refer to Figures 1-11 The present application provides a technical solution: a composite muffler of a ventilator system, comprising a shell 1, an air inlet 2 and an air outlet 3 are respectively arranged on both sides of the inside of the shell 1, an expansion assembly 4 is arranged on one side of the air inlet 2 and the air outlet 3, a resistance unit 6, a resonance pipe 5 and a resistance unit 8 are respectively arranged between the air inlet 2 and the air outlet 3, a capacity expansion assembly 7 is arranged in the resistance unit 6, and an adjusting assembly 9 is arranged on one side of the capacity expansion assembly 7.

[0045] The capacity expansion assembly 7 comprises two concave seats 707 slidingly sealed in the resistance unit 6, a plurality of connecting through holes 708 are linearly arranged on opposite sides of the two concave seats 707, connecting blocks 706 are fixedly connected to the outside of both sides of the concave seats 707, a horizontal plate 705 is fixedly connected to the other side of the connecting block 706, an installation block 704 is fixedly connected to the outside of one side of the horizontal plate 705, a rack 703 is fixedly connected to one side of the installation block 704, the concave seats 707 are moved by the rack 703 to expand and adjust the auxiliary sound attenuation cavity in the resistance unit 6, one side of the concave seat 707 is tapered, grooves are arranged on both sides of the outside of the resistance unit 6, and upper and lower sliding grooves are symmetrically arranged on both sides of the inside of the resistance unit 6, the sliding grooves are in communication with the grooves, the connecting blocks 706 are slidingly connected in the sliding grooves, and the horizontal plate 705 is slidingly sealed in the sliding grooves, the rack 703 is slidingly connected in the resistance unit 6 through a rectangular sliding block and a rectangular sliding groove, a gear 702 is engagedly connected to one side of the bottom of the rack 703, a driving motor 701 is fixedly connected to one side of the gear 702 through a rotating shaft, the other side of the driving motor 701 is fixedly connected to the inner wall of the shell 1, a straight-through hole is arranged on the side of the resistance unit 6 opposite to the air inlet 2, auxiliary exhaust holes are arranged on both sides of the straight-through hole, the auxiliary exhaust holes are arranged in the resistance unit 6, a rectangular sliding hole is arranged on the other side of the resistance unit 6, a sliding block 709 is fixedly connected to one side of the concave seat 707, the sliding block 709 is slidingly sealed in the rectangular sliding hole, and the sliding block 709 and the concave seat 707 are arranged on the same plane.

[0046] CUTTING-EDGE: First, the shell 1 is installed in the appropriate position, and sensors are provided at the air inlet 2 and the air outlet 3. When the ventilation system pipe needs to be connected to different positions outside, after the installation of the external ventilation system is completed, the external ventilation system will send the airflow into the resistance unit 6 through the air inlet 2. When the sensor detects that the wind speed of the external ventilation system is low, at this time, the airflow mainly enters the resistance unit 8 through the straight-through hole in the resistance unit 6, and the auxiliary exhaust hole contributes less due to low flow rate and small pressure difference. At this time, the resonant pipe 5 will process low-frequency noise in low-speed airflow, and the resistance unit 8 will process medium-high frequency noise in low-speed airflow. The straight-through hole provides a low-resistance main passage for the airflow, avoiding the formation of vortex or stagnation in the resistance unit, reducing pressure loss, and the shunt effect is weak, making the overall flow rate distribution of the product more uniform. When the sensor detects that the wind speed of the external ventilation system is high, at this time, the two auxiliary exhaust holes start to shunt the airflow due to the increase in pressure difference, and part of the airflow will be sent into the auxiliary processing cavity inside the resistance unit 6 through the auxiliary exhaust hole. The product can reduce the flow rate of the straight-through hole by shunting the high-speed airflow through the auxiliary exhaust hole, reduce turbulent noise and pressure loss, and the auxiliary cavity inside the resistance unit 6 can absorb part of the high-frequency turbulent noise, reduce the regenerative noise of the straight-through hole, and start the driving motor 701 according to actual needs. The driving motor 701 drives the shaft and the gear 702 to rotate, and the power is transmitted to the rack 703 through the linkage effect between the gear 702 and the rack 703, so that the rack 703 drives the mounting block 704, the horizontal plate 705, the connecting block 706 and the concave seat 707 to move, so as to adjust the length of the auxiliary cavity inside the resistance unit 6. It can enhance the stability of the airflow, reduce vortex shedding noise, and auxiliary reduce its resonance frequency, thereby auxiliary inhibit low-frequency noise at high speed, so that the product forms a multi-modal resonance, thereby effectively improving the overall use effect of the product.

[0047] The adjusting assembly 9 includes two connecting boxes 901, and the two connecting boxes 901 are fixedly connected with the inner wall of the resonant pipe 5 on opposite sides. The resonant pipe 5 is arranged in the resistance unit 6. A neck groove 905 is arranged between the two connecting boxes 901 and communicates with the resistance unit 8. Neck blocks 904 are arranged on both sides of the neck groove 905. The neck blocks 904 are slidingly sealed in the connecting boxes 901. Sliding plates 903 are fixedly connected to the opposite sides of the two neck blocks 904. The sliding plates 903 are slidingly connected in the connecting boxes 901. Springs 902 are fixedly connected to the other sides of the sliding plates 903 and the inner walls of the connecting boxes 901. Auxiliary liquid bags 906 are arranged on the top of the neck blocks 904. The auxiliary liquid bags 906 are fixedly connected to one side of the sliding plates 903 and the inner walls of the connecting boxes 901. Liquid delivery pipes 907 are communicated with one side of the auxiliary liquid bags 906. Main liquid bags 908 are communicated with the other ends of the liquid delivery pipes 907. The main liquid bags 908 are fixedly connected to the mounting blocks 704 and the outer walls of the resistance units 6.

[0048] Specific implementation: the mounting block 704 will extrude the main liquid bag 908 during the movement, the liquid inside the main liquid bag 908 is transported to the inside of the auxiliary liquid bag 906 through the infusion tube 907, the auxiliary liquid bag 906 is expanded and drives the sliding plate 903 and the neck block 904 to move, the use width of the neck slot 905 is adjusted, the flow rate of the high-speed airflow through the neck is reduced, the vortex shedding noise is reduced, the expansion of the neck slot 905 reduces the local drag coefficient of the airflow, reduces the pressure loss of the resonance pipeline 5 during use, and the product realizes self-adaptive variable working condition noise reduction, effectively improving the use stability of the system, wherein the infusion tube 907 is provided with a flow valve and a pressure valve.

[0049] The expansion assembly 4 comprises a fixed section 401, two fixed sections 401 are fixedly connected with the outer wall of the shell 1 on opposite sides, a plurality of telescopic sections 402 are slidingly sealed in the fixed section 401, a movable section 403 is slidingly sealed in the telescopic section 402, the fixed section 401, the telescopic section 402 and the movable section 403 are all tapered in cross-sectional shape, a fixed box 404 is fixedly connected on the outside of the fixed section 401, a fixed shaft 405 is rotatably connected in the fixed box 404, the fixed shaft 405 extends to the outside of the fixed box 404 and is fixedly connected with a handle 406 at the top end, a limiting module is arranged on the outer circumferential side of the fixed shaft 405, a first bevel gear 407 is fixedly connected to the bottom end of the fixed shaft 405, a second bevel gear 408 is meshingly connected on one side of the first bevel gear 407, a connecting shaft 409 is fixedly connected in the fixed box 404, and one end of the connecting shaft 409 extends to the outside of the fixed box 404 and is fixedly connected with a lead screw 411, a fixed block 410 is rotatably connected on the side away from the second bevel gear 408 of the connecting shaft 409, the fixed block 410 is fixedly connected with the outer wall of the fixed section 401 on one side, an adjusting seat 412 is arranged on the outer circumferential side of the lead screw 411 through a lead screw seat, the adjusting seat 412 is fixedly connected with the outer wall of the movable section 403 on one side, a plurality of intermediate seats 413 are arranged between the adjusting seat 412 and the fixed block 410, the intermediate seats 413 are slidingly connected on the outer circumferential side of the lead screw 411, a circular through hole is formed in one side of the adjusting seat 412, the fixed block 410 and the intermediate seat 413, a limiting rod is arranged in the circular through hole, one end of the limiting rod is fixedly connected with the outer wall of the fixed box 404, the limiting rod is fixedly connected in the fixed block 410 and slidingly connected in the adjusting seat 412 and the intermediate seat 413, a connecting rod 414 is fixedly connected on one side of the adjusting seat 412, the fixed block 410 and the intermediate seat 413, and a connecting rod unit 415 is arranged on the connecting rod 414.

[0050] Specifically, the staff manually operates the handle 406 to drive the fixed shaft 405 and the first bevel gear 407 to rotate, the power is transmitted to the second bevel gear 408 through the linkage effect between the first bevel gear 407 and the second bevel gear 408, the second bevel gear 408 drives the connecting shaft 409 and the lead screw 411 to rotate, then the power is transmitted to the lead screw seat through the linkage effect between the lead screw 411 and the lead screw seat, the lead screw seat drives the adjusting seat 412 to move, and the adjusting seat 412 drives the intermediate seat 413 to move on the outer peripheral side of the lead screw 411 through the connecting rod 414 and the connecting rod unit 415 during the movement, so that the intermediate seat 413 drives the telescopic section 402 to expand, thereby improving the installation portability of the product; the overall telescopic conical flow guide section is arranged, which facilitates the adjustment of the axial length of the product, can adapt to different installation spacings, reduces the requirement for the pipe centering accuracy, simplifies the installation process, is more flexible especially in the case of limited space or installation error, and the conical flow guide section assists in improving the uniformity of airflow entering the interior of the muffler and reducing local resistance loss; the connecting rod unit 415 is composed of a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all fixedly connected to the outer peripheral side of the connecting rod 414, the first connecting rod and the third connecting rod are arranged on one side, the second connecting rod and the fourth connecting rod are arranged on one side, the first connecting rod and the second connecting rod are hingedly connected to each other away from one end of the connecting rod 414, and the third connecting rod and the fourth connecting rod are hingedly connected to each other away from one end of the connecting rod 414; the material of the expansion assembly 4 is selected according to actual needs, and the fixed section 401, the telescopic section 402 and the movable section 403 are all internally provided with sound-absorbing materials and sealing layers.

[0051] Working principle: in use, first, the shell 1 is installed to a suitable position, and sensors are arranged at the air inlet 2 and the air outlet 3; when the ducts of the ventilator systems at different positions outside need to be connected, the staff manually operates the handle 406 to drive the fixed shaft 405 and the first bevel gear 407 to rotate, the power is transmitted to the second bevel gear 408 through the linkage effect between the first bevel gear 407 and the second bevel gear 408, the second bevel gear 408 drives the connecting shaft 409 and the lead screw 411 to rotate, then the power is transmitted to the lead screw seat through the linkage effect between the lead screw 411 and the lead screw seat, the lead screw seat drives the adjusting seat 412 to move, and the adjusting seat 412 drives the intermediate seat 413 to move on the outer peripheral side of the lead screw 411 through the connecting rod 414 and the connecting rod unit 415 during the movement, so that the intermediate seat 413 drives the telescopic section 402 to expand, thereby improving the installation portability of the product;

[0052] When the installation with the external ventilator system is completed, the external ventilator system will send the airflow through the air inlet 2 to the inside of the resistance unit 6, when the sensor detects that the wind speed of the external ventilator system is low, at this time the airflow mainly enters the inside of the resistance unit 8 through the straight-through hole in the inside of the resistance unit 6, the auxiliary exhaust hole contributes less because the flow speed is low and the pressure difference is small, at this time the resonant pipe 5 will process the low-frequency noise in the low-speed airflow, and the resistance unit 8 will process the medium-high frequency noise in the low-speed airflow, when the sensor detects that the wind speed of the external ventilator system is large, at this time the two auxiliary exhaust holes start to shunt the airflow because the pressure difference increases, part of the airflow will be sent to the auxiliary processing cavity inside the resistance unit 6 through the auxiliary exhaust hole, and according to the actual needs, the driving motor 701 is started, the driving motor 701 drives the shaft and the gear 702 to rotate, and the power is transmitted to the rack 703 through the linkage effect between the gear 702 and the rack 703, so that the rack 703 drives the mounting block 704, the horizontal plate 705, the connecting block 706 and the concave seat 707 to move, to adjust the length of the auxiliary cavity inside the resistance unit 6, and the mounting block 704 will extrude the main liquid bag 908 during the movement process, so that the liquid inside the main liquid bag 908 is sent to the inside of the auxiliary liquid bag 906 through the infusion tube 907, so that the auxiliary liquid bag 906 expands and drives the sliding plate 903 and the neck block 904 to move, to adjust the use width of the neck groove 905, convenient to use.

[0053] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A composite muffler for a ventilator system, comprising a housing (1), characterized in that: An air inlet (2) and an air outlet (3) are respectively provided on both sides of the interior of the housing (1); an expansion component (4) is provided on one side of each of the air inlet (2) and the air outlet (3); a resistance unit (6), a resonance pipe (5) and a resistance unit (8) are respectively provided between the air inlet (2) and the air outlet (3); an expansion component (7) is provided inside the resistance unit (6); and an adjustment component (9) is provided on one side of the expansion component (7); The expansion component (7) includes two concave seats (707) that are slidably sealed inside the resistance unit (6), and the two concave seats (707) have a plurality of connecting through holes (708) in a linear array on opposite sides. The concave seats (707) are fixedly connected to connecting blocks (706) on both sides of the outside, and the other side of the connecting block (706) is fixedly connected to a transverse plate (705). The outside side of the transverse plate (705) is fixedly connected to a mounting block (704), and one side of the mounting block (704) is fixedly connected to a rack (703). The rack (703) drives the concave seat (707) to move to the auxiliary silencer cavity inside the resistance unit (6) to perform expansion adjustment; One side of the concave seat (707) is set to be conical, and grooves are provided on both sides of the outside of the resistance unit (6), and slidable grooves are symmetrically provided on both sides of the inside of the resistance unit (6), and the slidable grooves are connected to the grooves. The connecting block (706) is slidably connected to the inside of the slidable groove, and the cross plate (705) is slidably sealed inside the slidable groove. The rack (703) is slidably connected to the inside of the resistance unit (6) through a rectangular slider and a rectangular slidable groove. One side of the bottom of the rack (703) is meshed with a gear (702), and one side of the gear (702) is fixedly connected to a A driving motor (701), the other side of the driving motor (701) is fixedly connected to the inner wall of the shell (1), the resistance unit (6) is provided with a straight row through hole on the side opposite to the air inlet (2), auxiliary row holes are provided on both sides of the straight row through hole, and the auxiliary row holes are provided inside the resistance unit (6), the other side of the resistance unit (6) is provided with a rectangular sliding hole, one side of the concave seat (707) is fixedly connected to a sliding block (709), the sliding block (709) is slidably sealed inside the rectangular sliding hole, and the sliding block (709) and the inner circumference of the concave seat (707) are provided on the same plane; The regulating assembly (9) comprises two connecting boxes (901), and opposite sides of the two connecting boxes (901) are fixedly connected to the inner wall of the resonance pipe (5), and the resonance pipe (5) is arranged inside the resistance unit (6). A neck groove (905) is provided between the two connecting boxes (901), and the neck groove (905) is connected to the resistance unit (8). Neck blocks (904) are provided on both sides of the neck groove (905), and the neck blocks (904) are slidably sealed inside the connecting box (901). The opposite sides of the two neck blocks (904) are fixedly connected to a sliding plate (903), and the sliding plate (903) is slidably connected. Inside the connection box (901), a spring (902) is fixedly connected to the other side of the sliding plate (903), and the other side of the spring (902) is fixedly connected to the inner wall of the connection box (901). A secondary liquid capsule (906) is provided on the top of the neck block (904), and both sides of the secondary liquid capsule (906) are respectively fixedly connected to one side of the sliding plate (903) and the inner wall of the connection box (901). One side of the secondary liquid capsule (906) is connected to an infusion tube (907), and the other end of the infusion tube (907) is connected to a main liquid capsule (908), and both sides of the main liquid capsule (908) are respectively fixedly connected to the mounting block (704) and the outer wall of the resistance unit (6); The expansion component (4) comprises a fixed section (401), two fixed sections (401) having opposite sides fixedly connected to the outer wall of the shell (1), a plurality of telescopic sections (402) being slidably sealed inside the fixed section (401), a movable section (403) being slidably sealed inside the telescopic section (402), the fixed section (401), the telescopic section (402) and the movable section (403) being all tapered in cross-sectional shape, a fixed box (404) being fixedly connected to both sides of the outside of the fixed section (401), a fixed shaft (405) being rotatably connected inside the fixed box (404), the fixed shaft (405) being rotatably connected inside the fixed box (404), the top end of the fixed shaft (405) extending to the outside of the fixed box (404) and being fixedly connected to a rotating handle (406), and a limiting module being provided on the outer peripheral side of the fixed shaft (405).

2. The composite muffler for a ventilator system according to claim 1, characterized in that: The bottom end of the fixed shaft (405) is fixedly connected to a first bevel gear (407), one side of the first bevel gear (407) is meshedly connected to a second bevel gear (408), and the interior of the second bevel gear (408) is fixedly connected to a connecting shaft (409), the connecting shaft (409) is rotatably connected to the interior of the fixed box (404), and one end of the connecting shaft (409) extends to the outside of the fixed box (404) and is fixedly connected to a lead screw (411), the side of the connecting shaft (409) away from the second bevel gear (408) is rotatably connected to a fixed block (410), and one side of the fixed block (410) is fixedly connected to the outer wall of the fixed section (401).

3. The composite muffler for a ventilator system according to claim 2, characterized in that: An adjustment seat (412) is provided on the outer peripheral side of the lead screw (411) through a lead screw seat. One side of the adjustment seat (412) is fixedly connected to the outer wall of the movable joint (403). A plurality of intermediate seats (413) are provided between the adjustment seat (412) and the fixed block (410). The intermediate seats (413) are slidably connected to the outer peripheral side of the lead screw (411).

4. The composite muffler for a ventilator system according to claim 3, characterized in that: A circular through hole is provided on one side of the interior of the adjusting seat (412), the fixing block (410) and the intermediate seat (413). A limiting rod is provided inside the circular through hole. One end of the limiting rod is fixedly connected to the outer wall of the fixing box (404). The limiting rod is fixedly connected to the interior of the fixing block (410), and the limiting rod is slidably connected to the interior of the adjusting seat (412) and the intermediate seat (413). A connecting rod (414) is fixedly connected to one side of the exterior of the adjusting seat (412), the fixing block (410) and the intermediate seat (413). A connecting rod unit (415) is provided on the connecting rod (414).

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