Ventilation sound insulator and silencer assembly

Abstract

The invention provides a ventilation sound insulator and a silencer assembly, and the ventilation sound insulator comprises a closed box body which is hollow to form a cavity; the plurality of hollow pipes respectively penetrate through the box body to form a plurality of channels which are mutually separated and independent from the cavity; wherein an elastic film is fixed on the inner wall of one channel, and the elastic film and the cavity form a film resonator. By the adoption of the sound insulation box, low-frequency noise can be effectively reduced by means of the thin film resonator formed by the elastic film and the cavity with the proper size, meanwhile, the sound insulation channel is matched with a common channel, so that the section of the box body has enough air flow passing area, air resistance is reduced, and noise is reduced. The ventilation sound insulator can effectively reduce low-frequency noise, can keep enough ventilation area proportion, and can be applied to more actual scenes.

Description

Technical Field

[0001] The invention relates to the technical field of mufflers, and in particular to a ventilation sound isolator and a muffler assembly. Background Art

[0002] Mufflers are widely used in ventilation ducts, such as boilers and steam turbine exhaust in industrial plants and mines such as power generation, chemical industry, metallurgy, and textiles, noise reduction of equipment such as fans and safety doors, and central air-conditioning systems in large buildings. The most mature technology at present is to use porous sound-absorbing materials or perforated plates installed on the side walls of the muffler to achieve the effect of attenuating noise in the channel. However, the principle of sound attenuation of perforated plates and sound-absorbing materials has been known to scientists and engineers all over the world for hundreds of years, and its inherent defects have not been overcome, that is, these two types of materials cannot effectively attenuate low-frequency sound waves, resulting in the effect of traditional mufflers being good at medium and high frequency sound insulation and poor at low frequencies. Summary of the invention

[0003] In view of this, the present invention provides a ventilation sound isolator and a muffler assembly to solve the above technical problems.

[0004] The ventilation sound isolator provided by the present invention comprises:

[0005] A closed box, wherein the box is hollow to form a cavity;

[0006] A plurality of hollow tubes, wherein the plurality of hollow tubes respectively penetrate the box body to form a plurality of channels that are separated from the cavity and are independent of each other;

[0007] An elastic film is fixed on the inner wall of one of the channels, and the elastic film and the cavity form a thin film resonator.

[0008] Optionally, the width of the channel accounts for 15%-30% of the width of the box.

[0009] Optionally, the ratio between the distance between two adjacent channels and the width of the channel is 6 / 13-12 / 13.

[0010] Optionally, the distance between every two adjacent channels is equal.

[0011] Optionally, in the channels where the elastic membrane is not provided, a noise reduction layer is fixed on the inner wall of at least one of the channels.

[0012] Optionally, the noise reduction layer is made of a porous material or a perforated plate.

[0013] Optionally, the elastic membrane is adhesively connected to the inner wall of the channel.

[0014] The present invention also provides a muffler assembly, comprising a plurality of the ventilation sound isolators described above, wherein the plurality of ventilation sound isolators are arranged in sequence and fixedly connected, and the plurality of channels of the plurality of ventilation sound isolators are connected one by one, and the plurality of channels with corresponding positions are connected to form a channel unit.

[0015] Optionally, in each of the channel units, an elastic membrane is fixed on the inner wall of at least one channel.

[0016] Optionally, adjacent ventilation sound isolators are adhesively connected.

[0017] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0018] By using the ventilation sound isolator and muffler assembly of the present invention, low-frequency noise can be effectively reduced by means of a thin film resonator formed by an elastic membrane and a cavity of appropriate size. At the same time, the coordination of the sound insulation channel and the ordinary channel ensures that there is sufficient area for wind flow through the cross-section of the box, thereby reducing wind resistance. This allows the ventilation sound isolator, which can effectively reduce low-frequency noise and retain a sufficient ventilation area ratio, to be applied to more practical scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a ventilation sound insulator according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a ventilation sound isolator according to another embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a ventilation sound isolator according to another embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a ventilation sound insulator according to another embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a muffler assembly according to an embodiment of the present invention;

[0024] Figure 6 for Figure 5 Front view of the muffler assembly shown.

[0025] Reference numerals:

[0026] 1: box; 2: hollow tube; 3: channel; 4: elastic membrane; 5: channel unit. DETAILED DESCRIPTION

[0027] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0028] Figure 1 A schematic diagram of a ventilation sound insulator according to an embodiment of the present invention; Figure 2 A schematic diagram of a ventilation sound isolator according to another embodiment of the present invention; Figure 3 A schematic diagram of a ventilation sound isolator according to another embodiment of the present invention; Figure 4 A schematic diagram of a ventilation sound isolator according to another embodiment of the present invention.

[0029] like Figure 1-Figure 4 As shown, the ventilation sound isolator includes a closed box 1 and a plurality of hollow tubes 2, wherein the box 1 is hollow to form a cavity; the plurality of hollow tubes 2 respectively penetrate the box 1 to form a plurality of channels 3 that are independent of the cavity; an elastic membrane 4 is fixed on the inner wall of one of the channels 3, and the elastic membrane 4 and the cavity constitute a thin film resonator.

[0030] When in use, any one of the multiple channels 3 is selected, and the elastic membrane 4 is fixed on the inner wall of the channel 3, and a certain pulling force is applied to the elastic membrane 4 to make it in a certain degree of tension state, then a thin film resonator composed of a membrane and an air layer is formed between the elastic membrane 4 and the cavity, and has a greater sound absorption effect near the resonance frequency of the thin film resonator. The channel 3 with the elastic membrane 4 fixed is a soundproof channel, and the channel 3 without the elastic membrane 4 fixed is a common channel. When noise passes through the soundproof channel, the resonance state generated by the coupling between the cavity and the elastic membrane 4 interacts with the noise in the soundproof channel, which can effectively reduce low-frequency noise. The frequency of the resonance state is closely related to the peripheral volume of the cavity. The larger the cavity volume, the lower the resonance state frequency, and the lower the noise frequency band of the soundproof channel response; the smaller the cavity volume, the higher the resonance state frequency, and the higher the noise frequency band of the soundproof channel response. By selecting a suitable outer size of the cavity, the low-frequency noise in the wind flow passing through the soundproof channel can be reduced by means of the thin film resonator composed of the elastic membrane 4 and the cavity. At the same time, when the wind flows through the ordinary channel, the noise in the wind is not reduced and the wind flows directly and smoothly.

[0031] By using the ventilation sound isolator of the present invention, with the help of a thin film resonator formed by the elastic membrane 4 and a cavity of appropriate size, low-frequency noise can be effectively reduced. At the same time, the cooperation between the sound insulation channel and the ordinary channel allows sufficient airflow area on the cross-section of the box 1, reducing wind resistance, so that the ventilation sound isolator can effectively reduce low-frequency noise and retain a sufficient ventilation area ratio, and can be applied to more practical scenarios.

[0032] like Figure 1-Figure 4 As shown, in this embodiment, the box body 1 is a rectangular parallelepiped, surrounded by a hard plate body, and the interior is hollow to form a cavity. Along the front and rear directions of the box body 1, four hollow tubes 2 penetrate the box body 1. The cross section of the hollow tube 2 is square, and the extension length is equal to the front and rear thickness of the box body 1. The surrounding cavity is closed, so that the channel 3 formed inside is completely isolated from the cavity. The four channels 3 are arranged in two rows and two columns. The elastic membrane 4 can be fixed to the inner wall of any channel 3. Figure 1 In the figure, the elastic membrane 4 is fixed on the inner walls of the four sides of the lower left corner channel 3. Figure 2 In the figure, the elastic membrane 4 is fixed on the inner walls of the four sides of the lower right corner channel 3. Figure 3 In the figure, the elastic membrane 4 is fixed on the inner walls of the four sides of the upper right corner channel 3. Figure 4 In the embodiment, the elastic membrane 4 is fixed on the inner walls of the four sides of the upper left channel 3, the channel 3 with the elastic membrane 4 fixed forms a soundproof channel, and the other three channels 3 without the elastic membrane 4 are ordinary channels. In this embodiment, the longitudinal cross-sectional dimensions of the box body 1 are 500mm×500mm, the thickness is 150mm, the longitudinal cross-sectional dimensions of each channel 3 are 130mm×130mm, the thickness is 150mm, and the elastic membrane 4 is fixed on the inner wall of one of the four channels 3. The frequency band of the noise response of the ventilation sound isolator can reach 150Hz, that is, it can eliminate the noise of the frequency band of 150Hz in the passing wind flow. At the same time, the cross-sectional area of ​​the four channels 3 accounts for 27% of the outer cross-sectional area of ​​the box body 1, which retains a sufficiently high ventilation rate and reduces wind resistance. According to the actual application, the shape of the box 1 and the hollow tube 2 can be adjusted. In order to match and reduce the noise of different frequency bands, the outer size of the box 1 can be adjusted appropriately, for example, the cross section is adjusted to 450×450mm, 600×600mm, etc. In order to obtain different ventilation rates, the cross-sectional size of the channel 3 can also be adjusted, and the number of channels 3 and the arrangement position on the box 1 can also be adjusted. For example, two channels, three channels, five channels, nine channels, etc. can be arranged. The channel 3 can be formed by the hollow tube 2 penetrating the hollow box 1, or it can be integrally formed during the manufacturing process of the box 1. The elastic membrane 4 has a very small rigidity and is in a tension state under tension. Plastic film, metal film, etc. can be selected.

[0033] Optionally, the width of the channel 3 accounts for 15%-30% of the width of the box 1. The width of the channel 3 is set so that the ventilation sound isolator as a whole has sufficient support provided by the box 1, and the channel 3 has sufficient cross-sectional area, which can effectively reduce wind resistance.

[0034] like Figure 1-Figure 4 As shown, in this embodiment, the cross-sections of the channel 3 and the box body 1 are both square, the cross-sectional width of the channel 3 is 130 mm, the outer width of the cross-sectional area of ​​the box body 1 is 500 mm, and the width of the channel 3 accounts for 26% of the width of the box body 1. With the changes in the outer dimensions of the box body 1 and the width of the channel 3, the ratio can also be set to other values ​​within 15%-30%.

[0035] Optionally, the ratio between the distance between two adjacent channels 3 and the width of the channel 3 is 6 / 13-12 / 13. This arrangement allows the two adjacent channels 3 to maintain an appropriate distance, which can not only provide a stable support for the ventilation sound isolator as a whole, but also allows the multiple channels 3 to maintain a certain distance and not be overly concentrated, thereby ensuring uniform ventilation.

[0036] like Figure 1-Figure 4 As shown, in this embodiment, the width of each channel 3 is 130 mm, the distance between two adjacent channels 3 in the transverse direction and the distance between two adjacent channels 3 in the longitudinal direction are both 80 mm, and the ratio between the distance between two adjacent channels 3 and the width of the channel 3 is 8 / 13. Depending on the actual application, the ratio can also be set to other ratios between 6 / 13 and 12 / 13, such as 7 / 13, 9 / 13, etc.

[0037] Optionally, the distance between each two adjacent channels 3 is equal. This arrangement allows all channels 3 to be evenly arranged at equal intervals, facilitates molding during the manufacturing process, and can ensure uniform ventilation.

[0038] like Figure 1-Figure 4 As shown, in this embodiment, the cross-section of the box 1 is a 500mm×500mm square, the cross-section of the channel 3 is a 130mm×130mm square, the distance between two adjacent channels 3 on the left and right, the distance between two adjacent channels 3 on the top and bottom, the distance between the left channel 3 and the left edge of the box 1, and the distance between the right channel 3 and the right edge of the box 1 are equal, all of which are 80mm.

[0039] Optionally, in the channels 3 without the elastic membrane 4, a noise reduction layer is fixed on the inner wall of at least one channel 3. Providing the noise reduction layer can appropriately enhance the sound insulation effect of medium and high frequency noise, which helps to improve the overall noise reduction effect of the ventilation sound isolator. The noise reduction layer can be made of existing mature sound insulation materials.

[0040] Optionally, the noise reduction layer is made of porous material or perforated plate. Porous material and perforated plate sound absorption are mature mid-high frequency noise reduction technologies with good noise reduction effect and easy to obtain materials.

[0041] Optionally, the elastic membrane 4 is bonded to the inner wall of the channel 3. Adhesive connection is easy to operate and is conducive to improving assembly efficiency.

[0042] Figure 5 A schematic diagram of a muffler assembly according to an embodiment of the present invention; Figure 6 for Figure 5 The front view of the muffler assembly is shown in FIG. Figure 5 and Figure 6 As shown, the present invention also provides a muffler assembly, comprising a plurality of ventilation sound isolators described in any of the above embodiments, the plurality of ventilation sound isolators are arranged in sequence and fixedly connected, and the plurality of channels 3 of the plurality of ventilation sound isolators are connected one by one, and the plurality of channels 3 with corresponding positions are connected to form a channel unit 5.

[0043] When in use, multiple ventilation sound isolators are arranged in sequence, each ventilation sound isolator has the same number of channels 3 arranged in the same position, and the channels 3 in the same corresponding position are interconnected to form a channel unit 5. In the same channel unit 5, if an elastic membrane 4 is arranged in the channel 3 of one or more ventilation sound isolators, the elastic membrane 4 and the cavity of the ventilation sound isolator where it is located form a thin film resonator, that is, there is a sound insulation channel, and when the wind flows through the channel unit 5, the low-frequency noise in the wind is eliminated; in the same channel unit 5, if no elastic membrane 4 is arranged in the channel 3 of any ventilation sound isolator, that is, each channel 3 is an ordinary channel, when the wind flows through the channel unit 5, the low-frequency noise cannot be eliminated, and the wind flows directly through.

[0044] By adopting the silencer assembly of the present invention, with the help of a thin film resonator formed by the elastic membrane 4 and a cavity of appropriate size, low-frequency noise can be effectively reduced. At the same time, the cooperation between the sound insulation channel and the ordinary channel allows sufficient airflow passing area on the cross-section of the box body 1, reducing wind resistance, so that the ventilated sound isolator can effectively reduce low-frequency noise and retain a sufficient ventilation area ratio, which can be applied to more practical scenarios.

[0045] like Figure 5 and Figure 6 As shown, in this embodiment, the muffler assembly is composed of four ventilation sound isolators, the outer dimensions of the box body 1 of each ventilation sound isolator are the same, each ventilation sound isolator is provided with four channels 3, and the opening positions of the four channels 3 on each ventilation sound isolator box body 1 correspond to each other, and an elastic membrane 4 is fixed on the inner wall of one of the four channels 3, and the four channels 3 corresponding to each other on the four ventilation sound isolators are interconnected to form a channel unit 5, Figure 5 and Figure 6There are four channel units 5 in total. According to the actual application, the muffler assembly can include any number of ventilation sound isolators, and the number of channels 3 opened in each ventilation sound isolator can also be adjusted to match, and the number of channel units 5 will change accordingly.

[0046] Optionally, in each channel unit 5, at least one channel 3 has an elastic membrane 4 fixed on its inner wall. This arrangement enables each channel unit 5 to eliminate low-frequency noise, and can evenly reduce the noise in the wind flow without affecting normal ventilation.

[0047] like Figure 5 As shown, in this embodiment, from front to back, the inner wall of the channel 3 at the lower left corner of the first layer of ventilation sound isolator is provided with an elastic membrane 4, the inner wall of the channel 3 at the lower right corner of the second layer of ventilation sound isolator is provided with an elastic membrane 4, the inner wall of the channel 3 at the upper right corner of the third layer of ventilation sound isolator is provided with an elastic membrane 4, and the inner wall of the channel 3 at the upper left corner of the fourth layer of ventilation sound isolator is provided with an elastic membrane 4. Thus, each channel unit 5 can reduce the low-frequency noise in the wind flow. When the number of ventilation sound isolators is greater than the number of channel units 5, multiple channels 3 in the same channel unit 5 may be provided with elastic membranes 4 on their inner walls.

[0048] Optionally, adjacent ventilation sound insulators are bonded to each other. The bonding connection method is simple to operate and is conducive to improving assembly efficiency.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ventilation sound insulator, characterized in that: include: A closed box, wherein the box is hollow to form a cavity; A plurality of hollow tubes, wherein the plurality of hollow tubes respectively penetrate the box body to form a plurality of channels that are separated from the cavity and are independent of each other; An elastic film is fixed on the inner wall of one of the channels, and the elastic film and the cavity form a thin film resonator.

2. The ventilation sound isolator according to claim 1, characterized in that: The width of the channel accounts for 15%-30% of the width of the box.

3. The ventilation sound insulator according to claim 1 or 2, characterized in that: The ratio between the distance between two adjacent channels and the width of the channel is 6 / 13-12 / 13.

4. The ventilation sound insulator according to claim 1 or 2, characterized in that: The distances between every two adjacent channels are equal.

5. The ventilation sound insulator according to claim 1 or 2, characterized in that: Among the channels not provided with the elastic membrane, a noise reduction layer is fixed on the inner wall of at least one of the channels.

6. The ventilation sound isolator according to claim 5, characterized in that: The noise reduction layer is made of porous material or perforated plate.

7. The ventilation sound insulator according to claim 1 or 2, characterized in that: The elastic membrane is bonded to the inner wall of the channel.

8. A muffler assembly, characterized in that: It comprises a plurality of ventilation sound isolators as described in any one of claims 1 to 7, wherein the plurality of ventilation sound isolators are arranged in sequence and fixedly connected, and the plurality of channels of the plurality of ventilation sound isolators are connected one by one, and the plurality of channels with corresponding positions are connected to form a channel unit.

9. The muffler assembly according to claim 8, characterized in that: In each of the channel units, an elastic membrane is fixed on the inner wall of at least one channel.

10. The muffler assembly according to claim 8 or 9, characterized in that: Adjacent ventilation sound insulators are bonded and connected.

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