CN203552690U - Adjustable resonant cavity - Google Patents

Abstract

The utility model provides an adjustable resonant cavity, which comprises: a sound-absorbing cavity, a volume adjustment device slidingly arranged at one end of the sound-absorbing cavity, and a connecting pipe arranged at the other end of the sound-absorbing cavity. Adding a volume adjustment device at one end of the anechoic chamber can adjust the volume of the anechoic chamber, so that the volume of the anechoic chamber can be adjusted within a certain range, and the first-order anechoic frequency of the adjustable resonant cavity can be within a certain range. Adjust within the range, so as to avoid the need to replace the entire noise reduction system when the noise reduction conditions change, effectively improving the utilization rate of the adjustable resonant cavity, and saving time and cost.

Description

adjustable resonator

technical field

The utility model relates to the field of auto parts, in particular to an adjustable resonant cavity.

Background technique

In the automotive field, it is often necessary to use some means to silence the interior of the car. The currently used resonant cavity (also known as the Helmholtz resonant cavity) is a cavity volume fixed structure. One end of the Helmholtz resonant cavity is connected to the sound field structure that needs to be silenced through a connecting tube, and the other end is a fixed volume structure. of the muffler chamber.

Please refer to FIG. 1 for details. The Helmholtz resonant cavity 10 in the prior art includes: an anechoic cavity 11 and a connecting pipe 12 arranged on one side of the cavity. connected.

However, since the volume of the anechoic cavity 11 is fixed, the anechoic frequency of the Helmholtz resonant cavity 10 is also fixed and cannot be changed. Once the working parts, working conditions, etc. change, or the actual volume of the anechoic chamber 11 of the Helmholtz resonator 10 has a large deviation due to production errors, the Helmholtz resonator 10 will The noise reduction efficiency is low, or even failure. That is to say, the anechoic frequency of the Helmholtz resonator 10 in the prior art is single and fixed, which cannot meet the requirements of different occasions.

Utility model content

The purpose of the utility model is to provide an adjustable resonant cavity, which can adjust the noise reduction frequency in a large range to meet the requirements of different occasions.

In order to achieve the above purpose, the utility model proposes an adjustable resonant cavity, including:

An anechoic cavity, a volume adjustment device and a connecting pipe; wherein, the volume adjustment device is slidably arranged at one end of the anechoic cavity, and the volume adjustment device is in close contact with the outer surface of the anechoic cavity, and the connection The pipe is arranged at the other end of the muffler cavity.

Further, the adjustable resonant cavity further includes a display scale, and the display scale is provided on the surface of the anechoic cavity close to the end of the volume adjustment device.

Further, the shape of the anechoic cavity is a hollow cylinder.

Further, the shape of the connecting pipe is a hollow cylinder.

Further, the shape of the volume adjusting device is a hollow cylinder.

Further, the volume adjusting device is slidably arranged at one end of the muffler cavity through threads.

Further, the volume adjusting device is slidably arranged at one end of the muffler cavity through a slot.

Compared with the prior art, the beneficial effect of the utility model is mainly reflected in that: adding a volume adjustment device at one end of the anechoic chamber can adjust the volume of the anechoic chamber, so that the volume of the anechoic chamber can be within the range Make adjustments to realize that the first-order noise reduction frequency of the adjustable resonance cavity can be adjusted within a certain range, so as to avoid the need to replace the entire noise reduction system when the noise reduction conditions change, and effectively improve the utilization rate of the adjustable resonance cavity , and save time and cost.

Description of drawings

FIG. 1 is a schematic structural diagram of a Helmholtz resonator in the prior art;

Fig. 2 is a schematic structural diagram of an adjustable resonant cavity in an embodiment of the present invention.

Detailed ways

The adjustable resonant cavity of the present invention will be described in more detail below in conjunction with the schematic diagram, wherein a preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art can modify the present invention described here and still realize the present invention New beneficial effects. Therefore, the following description should be understood as the broad knowledge of those skilled in the art, but not as a limitation of the present utility model.

In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions and constructions are not described in detail since they would obscure the invention with unnecessary detail. It should be appreciated that in the development of any actual embodiment, numerous implementation details must be worked out to achieve the developer's specific goals, such as changing from one embodiment to another in accordance with system-related or business-related constraints. Additionally, it should be recognized that such a development effort might be complex and time consuming, but would nevertheless be merely a routine undertaking for those skilled in the art.

In the following paragraphs, the present utility model is described more specifically by way of example with reference to the accompanying drawings. According to the following description and claims, the advantages and features of the utility model will be more clear. It should be noted that all the drawings are in very simplified form and use inaccurate scales, which are only used to facilitate and clearly illustrate the purpose of the embodiment of the present utility model.

The basic design idea of the adjustable resonant cavity of the utility model is: by adding a volume adjustment device, the muffler cavity of the adjustable resonant cavity is changed from the original fixed cavity to the adjustable cavity, thereby realizing the adjustable resonant cavity The first-order muffler frequency can be adjusted within a certain range.

Please refer to FIG. 2 , in this embodiment, an adjustable resonant cavity 100 is proposed, including: an anechoic cavity 110, a volume adjustment device 130 and a connecting pipe 120; wherein, the anechoic cavity 110, the volume adjustment device 130 And the connecting pipe 120 has a certain thickness of the inner wall, as shown by the dotted line in Figure 2, the volume adjusting device 130 is slidably arranged at one end of the muffler cavity 110, and the volume adjuster 130 is connected to the wall of the muffler cavity 110 The outer surfaces are in close contact. After adding the volume adjustment device 130 , the volume of the entire muffler chamber 110 can be adjusted in a wide range. The connecting pipe 120 is arranged at the other end of the muffler chamber 110 .

In this embodiment, the adjustable resonant cavity 100 also includes a display scale 140, the display scale 140 is set on the surface of the anechoic cavity 110 near the volume adjustment device 130, and the display scale 140 is based on the adjustment volume Calculate the corresponding silencing frequency, that is, it corresponds to different volumes and the silencing frequency under the volume. Marking the display scale 140 on the outer surface of the adjustable resonant cavity 100 can achieve the purpose of quick adjustment as required.

When the working boundary conditions of the adjustable resonant cavity 100 change, the anechoic frequency also needs to change accordingly. By estimating the boundary conditions, the display scale 140 on the outer surface of the adjustable resonant cavity 100 can be adjusted. Changing the volume of the noise reduction cavity 110 can make the adjustable resonance cavity 100 effective and good noise reduction effect.

In this embodiment, the anechoic chamber 110 is a hollow cylinder, and the connecting pipe 120 is also a hollow cylinder. The surfaces are in close contact with each other, and the volume adjustment device 130 is also a hollow cylinder. Wherein, the volume adjusting device 130 is slidably provided at one end of the muffler cavity 110 through threads or slots, so as to realize volume adjustment of the muffler cavity 100 . Of course, the shapes of the sound-absorbing cavity 110 and the volume adjusting device 130 can also be changed adaptively, such as being hollow cuboids and the like.

The adjustable resonant cavity 100 of the utility model changes the fixed anechoic cavity 110 into an adjustable structure, and converts the volume into a first-order anechoic frequency, which is marked on the outer surface of the anechoic cavity 110 for easy adjustment, and then can be adjusted under the working boundary conditions When the change occurs, the sound-absorbing chamber 110 can work effectively only by changing the volume of the sound-absorbing chamber 110 .

To sum up, in the adjustable resonant cavity provided by the embodiment of the present utility model, adding a volume adjustment device at one end of the anechoic chamber can adjust the volume of the anechoic chamber, so that the volume of the anechoic chamber can be within the range Make adjustments to realize that the first-order noise reduction frequency of the adjustable resonance cavity can be adjusted within a certain range, so as to avoid the need to replace the entire noise reduction system when the noise reduction conditions change, and effectively improve the utilization rate of the adjustable resonance cavity , and save time and cost.

The above are only preferred embodiments of the utility model, and do not limit the utility model in any way. Any person skilled in the technical field, without departing from the scope of the technical solution of the utility model, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the utility model, which is not deviating from the utility model. The content of the technical solution still belongs to the protection scope of the present utility model.

Claims (7)

1. an adjustable resonator cavity, is characterized in that, comprising:

Noise elimination cavity, volume adjustment means and connecting pipe; Wherein, described volume adjustment means is slided and is located at described noise elimination cavity one end, and the laminating of the intimate of described volume adjustment means and described noise elimination cavity, and described connecting pipe is located at the other end of described noise elimination cavity.

2. adjustable resonator cavity as claimed in claim 1, is characterized in that, described adjustable resonator cavity also comprises display scale, and described display scale is located at the surface of described noise elimination cavity near volume adjustment means one end.

3. adjustable resonator cavity as claimed in claim 1, is characterized in that, the right cylinder that is shaped as hollow of described noise elimination cavity.

4. adjustable resonator cavity as claimed in claim 3, is characterized in that, the right cylinder that is shaped as hollow of described connecting pipe.

5. adjustable resonator cavity as claimed in claim 3, is characterized in that, the right cylinder that is shaped as hollow of described volume adjustment means.

6. adjustable resonator cavity as claimed in claim 5, is characterized in that, described volume adjustment means is slided and is located at described noise elimination cavity one end by screw thread.

7. adjustable resonator cavity as claimed in claim 5, is characterized in that, described volume adjustment means is slided and is located at described noise elimination cavity one end by draw-in groove.

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