A silencer with a variable resonant cavity

Abstract

This utility model discloses a muffler with a variable resonant cavity, belonging to the field of muffler technology. It includes a housing, with a motor mounted at one end of the housing. A ball screw, comprising a screw rod and a nut, is installed inside the housing. The output end of the motor is connected to the screw rod, and a nut is mounted on the screw rod. A baffle is mounted at one end of the nut, and the nut and baffle are connected. A main pipe is installed inside the housing, penetrating the baffle. A first thin tube is mounted at one end of the main pipe, and a second thin tube is mounted at the other end. This design allows for changing the volume of the resonant cavity, diversifying the muffler's noise reduction capabilities, and enabling automatic adjustment of the muffler's noise reduction capacity to adapt to different operating conditions.

Description

Technical Field

[0001] This utility model belongs to the field of silencer technology, specifically relating to a silencer with a variable resonant cavity. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] The comfort of construction machinery is receiving increasing attention, and noise issues cannot be ignored. Engine noise is an important component of overall machine noise. As a crucial component for reducing engine noise in construction machinery, the performance of the muffler needs to be closely monitored. The muffler commonly used in construction machinery is the composite muffler, which combines the advantages of resistive and reactive mufflers.

[0004] Existing silencers are mainly composite silencers, which consist of sound-absorbing materials placed inside reactive silencers. Reactive silencers include several types such as expansion cavities, quarter-wavelength tubes, and Helmholtz resonators, but their structures are fixed, so their transmission loss is fixed and cannot cope with different working conditions or environments. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a muffler with a variable resonant cavity, which can change the volume of the resonant cavity, diversify the muffler's noise reduction capabilities, and achieve automatic adjustment of the muffler's noise reduction capabilities to adapt to different working conditions.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A muffler with a variable resonant cavity includes a housing, a motor is disposed at one end of the housing, and a ball screw is disposed inside the housing, the ball screw including a screw and a nut; The output end of the motor is connected to the screw, a nut is provided on the screw, a baffle is provided at one end of the nut, and the nut and the baffle are connected; a main pipe is provided inside the housing, the main pipe passes through the baffle, a first thin tube is provided at one end of the main pipe, and a second thin tube is provided at the other end.

[0007] Furthermore, a first bearing is provided at one end of the screw, and a second bearing is provided at the other end of the screw, and the first bearing and the second bearing are detachably connected to the screw.

[0008] Furthermore, the side of the first bearing is connected to the housing, and the end of the first bearing is connected to the motor.

[0009] Furthermore, the side of the second bearing is connected to the housing, and a bearing end cap is provided at one end of the second bearing.

[0010] Furthermore, the bearing end cap is connected to the second bearing and the housing.

[0011] Furthermore, the first thin tube is fixedly connected to the main pipe, and the second thin tube is fixedly connected to the main pipe, with the length of the second thin tube being greater than that of the first thin tube.

[0012] Furthermore, the baffle is a circular baffle, and a lip-shaped sealing ring is provided on the baffle.

[0013] Furthermore, the lip seal and the baffle are detachably connected.

[0014] Furthermore, both ends of the main pipe penetrate the shell, and the main pipe is fixedly connected to the shell; the main pipe, the first thin pipe, the second thin pipe, and the shell are welded together as one unit.

[0015] Furthermore, the motor and controller are electrically connected.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are: This invention incorporates a motor that drives a baffle to move left and right via a ball screw. This movement of the baffle changes the volume of the two resonant cavities, thus altering the overall noise reduction capability of the system. The different lengths of the first and second thin tubes increase the versatility of the noise reduction states.

[0017] The transmission loss curves of the baffles inside the muffler at different positions are stored in the controller. The controller makes different instructions to deal with different working conditions, so as to maximize the noise reduction capacity and realize the automatic adjustment of the muffler's noise reduction capacity to adapt to different working conditions. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 This is a structural diagram of the variable resonant cavity silencer of this utility model; In the diagram: 1. Shell; 2. Main pipe; 3. First capillary tube; 4. Second capillary tube; 5. Motor; 6. First bearing; 7. Screw; 8. Baffle; 9. Nut; 10. Lip seal; 11. Bearing end cap; 12. Second bearing. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] Existing silencers are mainly composite silencers, which consist of sound-absorbing materials placed inside reactive silencers. Reactive silencers include several types such as expansion cavities, quarter-wavelength tubes, and Helmholtz resonators, but their structures are fixed, so their transmission loss is fixed and cannot cope with different working conditions or environments.

[0022] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a muffler with a variable resonant cavity, such as... Figure 1 As shown, the device includes a housing 1, a motor 5 is installed at one end of the housing 1, and a ball screw is installed inside the housing 1. The ball screw includes a screw 7 and a nut 9. The output end of the motor 5 is connected to the screw 7, and the nut 9 is installed on the screw 7. A baffle 8 is installed at one end of the nut 9, and the nut 9 and the baffle 8 are connected. A main pipe 2 is installed inside the housing 1, and the main pipe 2 passes through the baffle 8. A first thin tube 3 is installed at one end of the main pipe 2, and a second thin tube 4 is installed at the other end.

[0023] Motor 5 drives baffle 8 to move left and right via a ball screw. The left and right movement of baffle 8 changes the volume of the two resonant cavities, thereby altering the noise reduction capability of the entire system. Motor 5 is electrically connected to the controller, which is an existing structure and can be a PLC controller. The transmission loss curves of baffle 8 in different positions inside the silencer are stored in the controller. The controller provides different instructions to respond to different operating conditions, controlling motor 5 to drive screw 7 to rotate, which in turn drives nut 9 to move. Nut 9 drives baffle 8 to move, changing the volume of the resonant cavities and maximizing the noise reduction capability. This achieves automatic adjustment of the silencer's noise reduction capability to adapt to different operating conditions.

[0024] A first bearing 6 is mounted on one end of the screw 7, and a second bearing 12 is mounted on the other end of the screw 7. The first bearing 6 and the second bearing 12 are detachably connected to the screw 7. The side of the first bearing 6 is connected to the housing 1, and the end of the first bearing 6 is connected to the motor 5. The side of the second bearing 12 is connected to the housing 1, and a bearing end cover 11 is mounted on one end of the second bearing 12. The bearing end cover 11 is connected to the second bearing 12 and the housing 1.

[0025] The screw 7 is supported by the first bearing 6 and the second bearing 12, ensuring the rotation of the screw 7, reducing the coefficient of friction during the movement of the screw 7, and ensuring its rotational accuracy. The bearing end cap 11 serves as a seal, enclosing the housing 1, and is used to install the second bearing 12.

[0026] The first thin tube 3 is fixedly connected to the main pipe 2, and the second thin tube 4 is also fixedly connected to the main pipe 2. The length of the second thin tube 4 is greater than that of the first thin tube 3. The difference in length between the first thin tube 3 and the second thin tube 4 increases the diversity of the silencing states. The length of the thin tubes is equivalent to the length of the neck of the Helmholtz resonator, which affects the resonant frequency, i.e., the silencing frequency.

[0027] Both ends of the main pipe 2 penetrate the housing 1, and the main pipe 2 is fixedly connected to the housing 1. The main pipe 2, the first thin pipe 3, the second thin pipe 4, and the housing 1 are welded together as one unit. The baffle 8 is a circular baffle 8, and a lip seal ring 10 is provided on the baffle 8. The lip seal ring 10 and the baffle 8 are detachably connected. The baffle 8 and the nut 9 of the ball screw are connected together by bolts, and this structure contacts the housing 1 through the lip seal ring 10; the screw 7 of the ball screw is fixed in the housing 1 by bearings and connected to the motor 5, and the ball screw needs to be protected by a heat-insulated and sealed air box; the baffle 8 and the main pipe 2 also contact each other through the lip seal ring 10.

[0028] The working method of the muffler with variable resonant cavity: The transmission loss curve of the baffle 8 in the muffler at different positions is stored in the controller. The controller drives the motor 5 to work, the motor 5 drives the screw 7 to rotate, which in turn moves the nut 9. The nut 9 drives the baffle 8 to move, so as to change the volume of the resonant cavity. The moving position of the baffle 8 is determined according to actual needs.

[0029] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A resonant cavity variable muffler, characterized by, The device includes a housing, a motor is installed at one end of the housing, and a ball screw is installed inside the housing. The ball screw includes a screw and a nut. The output end of the motor is connected to the screw, a nut is provided on the screw, a baffle is provided at one end of the nut, and the nut and the baffle are connected; a main pipe is provided inside the housing, the main pipe passes through the baffle, a first thin tube is provided at one end of the main pipe, and a second thin tube is provided at the other end.

2. A resonant cavity variable attenuator as claimed in claim 1, characterized in that A first bearing is provided at one end of the screw, and a second bearing is provided at the other end of the screw. The first bearing and the second bearing are detachably connected to the screw.

3. A resonant cavity variable attenuator as claimed in claim 2, characterized in that The side of the first bearing is connected to the housing, and the end of the first bearing is connected to the motor.

4. A resonant cavity variable attenuator as claimed in claim 2, wherein, The side of the second bearing is connected to the housing, and a bearing end cap is provided at one end of the second bearing.

5. A resonant cavity variable attenuator as claimed in claim 4, characterized in that The bearing end cap is connected to the second bearing and the housing.

6. A resonant cavity variable attenuator as claimed in claim 1, wherein, The first thin tube is fixedly connected to the main pipe, and the second thin tube is fixedly connected to the main pipe. The length of the second thin tube is greater than that of the first thin tube.

7. A resonant cavity variable attenuator as claimed in claim 1, wherein, The baffle is a circular baffle, and a lip-shaped sealing ring is provided on the baffle.

8. A resonant cavity variable attenuator as claimed in claim 7, characterized in that The lip seal and the baffle are detachably connected.

9. A resonant cavity variable attenuator as claimed in claim 1, wherein, The main pipe passes through the shell at both ends and is fixedly connected to the shell; the main pipe, the first thin pipe, the second thin pipe and the shell are welded together as one unit.

10. A resonant cavity variable attenuator as claimed in claim 1, wherein, The motor and controller are electrically connected.

Images