Broadband silencers and pressurization systems for pressurized buildings

Abstract

This invention discloses a broadband silencer and pressurization system for pressurized buildings. The broadband silencer for pressurized buildings includes a functional pipe section and connecting pipe sections on both sides of the functional pipe section. The side of the functional pipe section closer to the pressurization equipment is its inlet direction, and the side farther from the pressurization equipment is its outlet direction. The functional pipe section is completely filled with multiple silencing sections along its length. Each silencing section is composed of a porous material, and the length of the silencing section gradually decreases from the inlet to the outlet direction, as does the pore size of the porous material. This broadband silencer for pressurized buildings, by completely filling the functional pipe section with porous material and employing the material's sound absorption principle, ensures a good silencing effect. Since this silencer is used in conjunction with pressurization equipment, the pressure loss caused by the porous material is negligible. Therefore, this silencer can ensure a good silencing effect in a small volume and achieve highly efficient silencing.

Description

Technical Field

[0001] This invention relates to the field of silencer structure technology, and more particularly to a broadband silencer and pressurization system for pressurized buildings. Background Technology

[0002] A pressurized building is a building where the indoor atmospheric pressure is significantly higher than the outdoor ambient pressure. Pressurized buildings utilize pressurization equipment to mechanically pressurize and supply air to the building. The main types of pressurization equipment include screw air compressors, scroll air compressors, piston air compressors, screw blowers, and Roots blowers. These equipment are characterized by high rotational speeds. When the pressurization equipment is directly connected to the building's air supply ducts, significant noise can be detected at the air outlet. Tests revealed that the noise is primarily low-to-mid frequency and originates from the equipment itself. The noise propagates through the air supply ducts; therefore, silencers need to be installed on the air supply ducts to reduce noise.

[0003] Existing mufflers have the following shortcomings:

[0004] 1. Too much space occupied. The cost of pressurized building units is high, and space utilization needs to be maximized. However, low- and medium-frequency silencers are usually large in size, with a cross-sectional size several times that of the air supply duct, which takes up building space. It is necessary to increase the building volume or sacrifice the building space layout to effectively install the silencers.

[0005] 2. Narrow noise spectrum. Existing low- and medium-frequency silencers are highly effective within a specific frequency range. Booster equipment uses frequency conversion to control airflow; during the frequency conversion process, the noise spectrum generated by the booster equipment changes, and the range of change is quite wide. Existing silencers are insufficient to meet the requirements of booster buildings.

[0006] 3. Low noise reduction capacity. The noise transmitted through the air duct of the booster equipment is large, requiring multiple silencers to meet the requirements. Summary of the Invention

[0007] The main objective of this invention is to provide a broadband silencer and pressurization system for pressurized buildings, aiming to reduce the size of the silencer while ensuring its noise reduction effect.

[0008] To achieve the above objectives, the present invention provides a broadband silencer for pressurized buildings, comprising a functional pipe section and connecting pipe sections located on both sides of the functional pipe section, wherein,

[0009] The side of the functional pipe section closest to the booster is its inlet direction, and the side furthest from the booster is its outlet direction. The internal length of the functional pipe section is completely filled with multiple silencing sections, each composed of a porous material. The length of the silencing section gradually decreases from the inlet to the outlet of the functional pipe section, and the pore size of the porous material gradually decreases as well.

[0010] Preferably, the inner diameter of the functional pipe section is 1.1 to 2 times the inner diameter of the connecting pipe section.

[0011] Preferably, a wire mesh is also installed between the outlet side of the functional pipe section and the connecting pipe section.

[0012] Preferably, a fresh air filter is installed between the wire mesh and the sound-absorbing section.

[0013] Preferably, the wire mesh is a stainless steel wire mesh with a mesh size of 2 to 10, and the diameter of the wires in the wire mesh is not less than 1 mm.

[0014] Preferably, the length of the functional pipe section is greater than 400 mm.

[0015] Preferably, the porous material is one of open-cell PU sponge, open-cell PE sponge, open-cell EPDM sponge, open-cell PVC sponge, or open-cell EVA sponge.

[0016] Preferably, the length of the functional pipe section is L, and the functional pipe section includes a first silencing section, a second silencing section and a third silencing section arranged sequentially from the inlet to the outlet. The lengths of the first silencing section and the second silencing section are both 0~0.8L, and the length of the third silencing section is 10mm~30mm.

[0017] Preferably, the porous material of the first noise-absorbing section has an average number of pores of 5 to 20 per unit inch, the porous material of the second noise-absorbing section has an average number of pores of 20 to 50 per unit inch, and the porous material of the third noise-absorbing section has an average number of pores of 60 to 90 per unit inch.

[0018] The present invention further proposes a pressurization system, including the aforementioned broadband silencer for pressurized buildings, and a pressurization device connected thereto, wherein the outlet of the pressurization device is connected to the broadband silencer via a pipe.

[0019] This invention proposes a broadband silencer for pressurized buildings. By completely filling functional pipe sections with porous material, the silencer utilizes the sound-absorbing principle of the porous material to ensure effective noise reduction. Since this silencer is used in conjunction with pressurization equipment, the pressure loss caused by the porous material is negligible. Therefore, this silencer can achieve effective noise reduction in a small volume while maintaining high efficiency. Furthermore, broadband noise reduction is achieved through the matching of pore sizes and lengths of various porous materials. Moreover, this broadband silencer integrates a fresh air filter, thus realizing the integration of noise reduction and fresh air filtration. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the broadband silencer for pressurized buildings according to the present invention. Figure 1 The middle arrow indicates the direction of airflow.

[0021] In the diagram, 1 is the connecting pipe section; 2 is the functional pipe section; 3 is the first silencing section; 4 is the second silencing section; 5 is the third silencing section; 6 is the fresh air filter; and 7 is the wire mesh.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] It should be noted that in the description of this invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] This invention proposes a broadband silencer for pressurized buildings.

[0026] Reference Figure 1 In this preferred embodiment, a broadband silencer for pressurized buildings includes a functional pipe section 2 and connecting pipe sections 1 located on both sides of the functional pipe section 2, wherein...

[0027] Functional pipe section 2 has its inlet direction on the side closer to the booster compressor and its outlet direction on the side farther away from the booster compressor. The interior of functional pipe section 2 is completely filled with multiple silencing sections along its length. Each silencing section is composed of a porous material, and the length of the silencing sections gradually decreases from the inlet to the outlet, as does the pore size of the porous material. Functional pipe section 2 can be integrally formed with connecting pipe section 1.

[0028] Both connecting pipe section 1 and functional pipe section 2 are straight pipe sections. In existing technology, most silencers use the principle of reflection, while this silencer uses the principle of absorption. At the same time, the interior of functional pipe section 2 is completely filled with multiple silencing sections. Complete filling means that the entire interior of the pipe is filled, not just a partial filling on a certain part of the side wall. The disadvantage of complete filling is that it will bring pressure loss. However, this silencer is connected to a pressurization device. The outlet pressure of the pressurization device is high, so the pressure loss caused by the silencer can be basically ignored. Therefore, silencers used in pressurized buildings can be adopted, and the two can be perfectly combined.

[0029] Specifically, in this embodiment, the inner diameter of the functional pipe section 2 is 1.1 to 2 times the inner diameter of the connecting pipe section 1. Because in this embodiment, the interior of the functional pipe section 2 is completely filled with multiple sound-absorbing sections, compared with a structure that is partially filled with porous material, this structure can greatly improve the sound-absorbing effect. Therefore, the silencer can achieve a relatively good sound-absorbing effect while being made smaller in size.

[0030] Porous materials possess air filtration capabilities. Utilizing this characteristic, this silencer divides the filled porous material into three different pore sizes (in other variations, more than three types of porous materials may be used; this invention does not limit this). The pore sizes decrease sequentially according to the airflow direction. The porous material achieves step-by-step filtration of the supplied air.

[0031] Furthermore, a fresh air filter 6 is installed between the wire mesh 7 and the silencer section. Specifically, the fresh air filter 6 can be a HEPA filter. By installing the fresh air filter 6 behind the porous material, and by setting the appropriate fresh air filter 6 according to the filtration level, this silencer achieves integrated silencer and fresh air filtration functions.

[0032] Furthermore, a wire mesh 7 is installed between the outlet side of functional pipe section 2 and connecting pipe section 1. The wire mesh 7 supports the porous material and the fresh air filter 6, preventing the porous material and the fresh air filter 6 from entering the connecting pipe section 1 under the impact of airflow.

[0033] Specifically, the wire mesh 7 is a stainless steel wire mesh with a mesh size of 2 to 10, and the diameter of the wire in the wire mesh 7 is not less than 1 mm.

[0034] Specifically, the length of functional section 2 is greater than 400mm. The porous material is one of the following: open-cell PU sponge, open-cell PE sponge, open-cell EPDM sponge, open-cell PVC sponge, or open-cell EVA sponge.

[0035] In this embodiment, the length of functional section 2 is L. Functional section 2 includes a first silencing section 3, a second silencing section 4, and a third silencing section 5 arranged sequentially from the inlet to the outlet (each silencing section has a cylindrical structure). The lengths of the first silencing section 3 and the second silencing section 4 are both 0~0.8L, and the length of the third silencing section 5 is 10mm~30mm (the third silencing section is a small-pore sponge and does not need to be too thick, so a short section is sufficient). The average number of pores per unit inch of the porous material in the first silencing section 3 is 5~20, the average number of pores per unit inch of the porous material in the second silencing section 4 is 20~50, and the average number of pores per unit inch of the porous material in the third silencing section 5 is 60~90.

[0036] By selecting the length of each silencing segment and matching it with a suitable aperture, this silencer can achieve the silencing effect for different frequency bands of sound.

[0037] Specifically, the functional tube section 2 of the muffler can be configured as a multi-section detachable structure, with the multiple sections connected by threads or clamps, so as to place porous materials inside the functional tube section 2.

[0038] This invention proposes a broadband silencer for pressurized buildings. By completely filling the functional pipe section 2 with porous material, the silencer utilizes the sound absorption principle of the porous material to ensure its noise reduction effect. Since this silencer is used in conjunction with a pressurizer, the pressure loss caused by the porous material is negligible. This silencer can achieve effective noise reduction in a small volume while maintaining high efficiency. Furthermore, broadband noise reduction is achieved through the matching of pore sizes and lengths of various porous materials. Moreover, this broadband silencer integrates a fresh air filter 6, thus realizing the integration of noise reduction and fresh air filtration.

[0039] The present invention further proposes a booster system.

[0040] In this preferred embodiment, a pressurization system includes the aforementioned broadband silencer for pressurized buildings, and further includes a pressurization device connected thereto. The outlet of the pressurization device is connected to the broadband silencer via a pipe. The specific structure and beneficial effects of the broadband silencer are as described in the above embodiments, and will not be repeated here.

[0041] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A broadband silencer for pressurized buildings, characterized in that, This includes functional pipe sections and connecting pipe sections located on both sides of the functional pipe sections, wherein, The side of the functional pipe section closest to the booster compressor is its inlet direction, and the side furthest from the booster compressor is its outlet direction. The internal length of the functional pipe section is completely filled with multiple silencing sections, each composed of a porous material. The length of the silencing section gradually decreases from the inlet to the outlet of the functional pipe section, and the pore size of the porous material gradually decreases as well.

2. The broadband silencer for pressurized buildings as described in claim 1, characterized in that, The inner diameter of the functional pipe section is 1.1 to 2 times the inner diameter of the connecting pipe section.

3. The broadband silencer for pressurized buildings as described in claim 1, characterized in that, A wire mesh is also installed between the outlet side of the functional pipe section and the connecting pipe section.

4. The broadband silencer for pressurized buildings as described in claim 3, characterized in that, A fresh air filter is installed between the wire mesh and the sound-absorbing section.

5. The broadband silencer for pressurized buildings as described in claim 3, characterized in that, The wire mesh is a stainless steel wire mesh with a mesh size of 2 to 10, and the diameter of the wire is not less than 1 mm.

6. The broadband silencer for pressurized buildings as described in claim 1, characterized in that, The length of the functional pipe section is greater than 400mm.

7. The broadband silencer for pressurized buildings as described in claim 1, characterized in that, The porous material is one of the following: open-cell PU sponge, open-cell PE sponge, open-cell EPDM sponge, open-cell PVC sponge, or open-cell EVA sponge.

8. The broadband silencer for pressurized buildings as described in any one of claims 1 to 7, characterized in that, The length of the functional pipe section is L. The functional pipe section includes a first silencer section, a second silencer section and a third silencer section arranged sequentially from the inlet to the outlet. The lengths of the first silencer section and the second silencer section are both 0~0.8L, and the length of the third silencer section is 10mm~30mm.

9. The broadband silencer for pressurized buildings as described in claim 8, characterized in that, The porous material of the first noise-absorbing section has an average number of pores of 5 to 20 per unit inch, the porous material of the second noise-absorbing section has an average number of pores of 20 to 50 per unit inch, and the porous material of the third noise-absorbing section has an average number of pores of 60 to 90 per unit inch.

10. A booster system, characterized in that, It includes a broadband silencer for pressurized buildings as described in any one of claims 1 to 9, and further includes a pressurization device connected thereto, the outlet of which is connected to the broadband silencer via a pipe.

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