Low-frequency noise reduction device for fresh air system

Abstract

The utility model discloses a low-frequency noise reduction device for a fresh air system, and relates to the technical field of fresh air systems, the low-frequency noise reduction device comprises a main machine and polyurethane foam, the polyurethane foam is installed at the rear end of the outer surface of the main machine, and an air outlet pipe is installed at the rear end of the outer surface of the main machine; the outer surface of the polyurethane foam is fixedly installed at the joint of the main machine and the air outlet pipe, an air distribution box is installed at the bottom end of the shaft surface of the air outlet pipe, in the design of the air guide pipe, the air flow path is optimized, friction during air flowing is reduced through a streamline turning structure, noise generated at the turning position is effectively reduced, meanwhile, noise reduction holes are additionally formed, and the noise reduction effect is improved. According to the utility model, sound waves can be further dissipated while smooth passing of airflow is ensured, the overall mute performance is improved, and the sound insulation layer is made of materials such as high-density polyurethane foam and a rubber pad and is specially used for processing low-frequency noise at the joint of the main machine and the air distribution box, so that vibration and sound waves are effectively absorbed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a new trend system technical field, concretely relates to a low frequency noise reduction device for new trend system. BACKGROUND

[0002] The new trend system is like a "breather" of indoor air, which can introduce the purified outdoor fresh air under the condition of not opening the window, and discharge the indoor dirty air. This can effectively prevent the outdoor dust, haze and other pollution from entering the indoor, but the biggest deficiency of the new trend system is the complex pipeline design and the noise that may be generated during the pipeline ventilation operation.

[0003] The noise of the new trend system mainly comes from two places: one is the friction sound of the wind in the pipeline turning; the second is the noise of the air outlet of the host and the air distribution box. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, a low frequency noise reduction device for new trend system is provided, which solves the problems of friction sound and air outlet noise of the pipeline.

[0005] To achieve the above purposes, the utility model adopts the technical scheme that:

[0006] A low frequency noise reduction device for new trend system, comprising: a host and polyurethane foam, the rear end of the outer surface of the host is provided with polyurethane foam, the rear end of the outer surface of the host is provided with an air outlet pipe, and the outer surface of the polyurethane foam is fixedly installed at the connection between the host and the air outlet pipe, the bottom end of the shaft surface of the air outlet pipe is provided with an air distribution box, the inner middle end of the air distribution box is provided with a partition plate, and the inner side of the air distribution box and the outer surface of the partition plate are provided with rubber pads.

[0007] Preferably, the air distribution box is provided with installation rods on both sides of the inner side, the shaft surface of the installation rod is inserted with a first installation frame, the shaft surface of the installation rod is inserted with a second installation frame on the inner side of the first installation frame, and the shaft surface of the installation rod is fixedly provided with a third installation frame on the inner side of the second installation frame.

[0008] Preferably, the third installation frame is provided with a plurality of groups of third rubber foams in the inner side, the second installation frame and the third installation frame are provided with second rubber foams on the opposite outer surfaces, and the second installation frame and the first installation frame are provided with first rubber foams on the opposite outer surfaces.

[0009] Preferably, the outer surface of the first rubber foam, the second rubber foam and the third rubber foam is provided with a plurality of groups of noise reduction holes.

[0010] Preferably, the outer surface rear end of the air distribution box is provided with polyurethane foam, the inner side of the polyurethane foam is provided with the air guide pipe, and the axial surface corner of the air guide pipe is provided with the noise reduction piece.

[0011] Preferably, the inside of the noise reduction piece is provided with a plurality of groups of baffles, the outside corner of the inside of the noise reduction piece is provided with sponge, the opposite surfaces of the sponge in the inside of the noise reduction piece are provided with plant fiber sound absorbing cotton, and the bottom end of the axial surface of the air guide pipe is provided with the connecting section.

[0012] Compared with the prior art, the air guide pipe is designed, the air flow path is optimized, the friction during air flow is reduced through the streamlined turning structure, the noise generated at the turning corner is effectively reduced, the noise reduction holes are additionally arranged, the smooth air flow is ensured, the sound waves are further dissipated, the overall mute performance is improved, high-density polyurethane foam and rubber pads are used as the sound insulation layer, the low-frequency noise at the connection between the main machine and the air distribution box is specially treated, vibration and sound waves are effectively absorbed, and the noise generated during the operation of the fresh air system is reduced to the minimum.

[0013] In the low-frequency noise reduction device for the fresh air system, the air guide pipe is designed, the air flow path is optimized, the friction during air flow is reduced through the streamlined turning structure, the noise generated at the turning corner is effectively reduced, the noise reduction holes are additionally arranged, the smooth air flow is ensured, the sound waves are further dissipated, the overall mute performance is improved, high-density polyurethane foam and rubber pads are used as the sound insulation layer, the low-frequency noise at the connection between the main machine and the air distribution box is specially treated, vibration and sound waves are effectively absorbed, and the noise generated during the operation of the fresh air system is reduced to the minimum. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structural schematic view of the utility model;

[0015] Fig. 2 It is a structural schematic view of the noise reduction piece in the utility model;

[0016] Fig. 3 It is a structural schematic view of the air distribution box in the utility model.

[0017] Reference numerals in the drawing are:

[0018] 1, main machine; 2, polyurethane foam; 3, air outlet pipe; 4, air distribution box; 5, air guide pipe; 6, noise reduction piece; 7, connecting section; 8, baffle; 9, sponge; 10, plant fiber sound absorbing cotton; 11, mounting rod; 12, rubber pad; 13, first mounting frame; 14, second mounting frame; 15, third mounting frame; 16, first rubber foam; 17, second rubber foam; 18, third rubber foam; 19, noise reduction hole; 20, isolation plate. DETAILED DESCRIPTION

[0019] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art.

[0020] Reference Figs. 1-3As shown, a low-frequency noise reduction device for fresh air system, comprising: host 1 and polyurethane foam 2, host 1 for generating and conveying air, it is responsible for the indoor air suction, and after processing through the air outlet pipe 3, host 1 is installed with polyurethane foam 2 on the outer surface of the rear end, polyurethane foam 2 is a good sound insulation material, which can effectively absorb low-frequency noise, can reduce the noise generated during operation to the outside, this layer of material reduces the overall noise level by physical means, host 1 is installed with air outlet pipe 3 on the outer surface of the rear end, and the outer surface of polyurethane foam 2 is fixedly installed at the connection between host 1 and air outlet pipe 3, the shaft surface bottom end of air outlet pipe 3 is installed with air distribution box 4, the function of air distribution box 4 is to further distribute the airflow from host 1 to multiple directions, which can control the noise at a low level under the condition of large air volume.

[0021] Further, the inner middle end of air distribution box 4 is installed with isolation plate 20, the main function of isolation plate 20 is to form multiple airflow channels inside air distribution box 4, when the airflow passes through air distribution box 4, isolation plate 20 will help control the direction and speed of airflow, and also help reduce the reflection of sound waves in the box, thereby reducing low-frequency noise, the inner side of air distribution box 4 and the outer surface of isolation plate 20 are installed with rubber pad 12, rubber pad 12 has good shock absorption and sound insulation performance, which can effectively absorb the vibration and noise caused by airflow, thereby reducing the spread of sound and improving the quietness of the whole system, the both sides of the inside of air distribution box 4 are installed with mounting rod 11, the shaft surface of mounting rod 11 is inserted with first mounting frame 13, the shaft surface of mounting rod 11 is inserted with second mounting frame 14 on the inner side of first mounting frame 13, the shaft surface bottom end of mounting rod 11 is fixedly installed with third mounting frame 15 on the inner side of second mounting frame 14, first mounting frame 13 is located on the outer layer of mounting rod 11, mainly plays a preliminary sound insulation role, reduces the noise caused by air flow, second mounting frame 14 provides a stronger sound insulation barrier, protects users from low-frequency noise through additional sound insulation levels, third mounting frame 15 is located at the bottom layer, which further enhances the noise isolation effect, limits the low-frequency noise in the box, and avoids its transmission to the indoor environment.

[0022] Further, the third mounting frame 15 has several groups of third rubber foam 18 installed inside, the second mounting frame 14 and the third mounting frame 15 have second rubber foam 17 installed on the opposite outer surfaces, the second mounting frame 14 and the first mounting frame 13 have first rubber foam 16 installed on the opposite outer surfaces, the first rubber foam 16 provides additional sound absorption capacity, which has good elasticity and shock absorption performance, can effectively offset low-frequency noise, they can absorb the energy of sound waves by deforming when the airflow passes through, thereby reducing the sound pressure level, the second rubber foam 17 continues to improve the sound insulation effect, the existence of this layer helps to form a more effective sound barrier, optimizing the absorption and weakening of sound, the third rubber foam 18 further increases the sound insulation performance of the system, working together with other foam layers, they jointly create a multi-layer sound insulation structure to shield noise from air movement, the outer surface of the first rubber foam 16, the second rubber foam 17 and the third rubber foam 18 is provided with several groups of noise reduction holes 19, which provide a channel for airflow while helping to control the spread of noise, the design of the noise reduction holes 19 can reduce air resistance while promoting the transmission of sound waves through a special path, so that they can be effectively consumed and dispersed, further reducing noise.

[0023] Further, the outer surface of the air distributor 4 has polyurethane foam 2 installed at the rear end, the outer surface of the air distributor 4 has air guide pipe 5 installed inside the polyurethane foam 2 at the rear end, the air guide pipe 5 connects the air distributor 4 with the airflow release port, ensuring that the treated air flows out in a specific direction, the design of the noise reduction piece 6 is to further reduce the noise transmitted along the air guide pipe 5, the internal several groups of baffles 8 can intercept the transmission path of sound waves, by changing the propagation direction of sound waves, reducing their energy, making them more easily absorbed or canceled out, the air guide pipe 5 has noise reduction piece 6 installed at the shaft surface corner, the noise reduction piece 6 has several groups of baffles 8 installed inside, the noise reduction piece 6 has sponge 9 installed at the inside corner, its soft material and porous structure can improve the attenuation effect of sound waves, ensuring that sound can be dissipated in this corner area, the opposite surface of the sponge 9 inside the noise reduction piece 6 has plant fiber sound absorbing cotton 10, which provides an additional absorption layer for sound waves, plant fiber materials generally have excellent sound absorption performance and are environmentally friendly, which can effectively reduce multi-frequency noise, the air guide pipe 5 has a connecting section 7 installed at the bottom of the shaft surface, responsible for introducing the treated airflow into the final use environment.

[0024] Working principle and implementation: first host 1 is responsible for inhaling and processing indoor air, the polyurethane foam 2 installed at the rear end of its outer surface as a good sound insulation material, help to reduce the low frequency noise from the host 1, the processed air through the air outlet pipe 3 into the air distribution box 4, air distribution box 4 is provided with isolation plate 20 inside, form a plurality of airflow channels, this not only help to control the direction and speed of airflow, but also reduce the reflection of sound waves in the box to further reduce noise, air distribution box 4 inside and isolation plate 20 surface inlaid rubber pad 12, with good damping effect, can effectively absorb the vibration and noise caused by airflow, in the multilayer sound insulation structure, the first installation frame 13, the second installation frame 14 and the third installation frame 15 are complementary, together strengthen the overall noise isolation performance, ensure that the low frequency noise is limited in the box, in addition, the rubber foam in each installation frame is configured, which further improves the sound absorption capacity through elastic deformation, especially the design of the noise reduction hole 19 effectively controls the airflow resistance, and also provides a dissipation path for sound waves, then the baffle 8 inside the noise reduction piece 6 effectively changes the sound wave propagation direction, reduces the energy transmission, finally the air after this series of processing will be introduced into the user environment through the connecting section 7, to ensure that the fresh, quiet and undisturbed air quality is provided.

[0025] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A low frequency noise reduction device for a fresh air system, characterized in that Include: Host (1) and polyurethane foam (2), the outer surface of the host (1) rear end is installed with polyurethane foam (2), the outer surface of the host (1) rear end is installed with air pipe (3), and the outer surface of polyurethane foam (2) is fixedly installed at the connection of host (1) and air pipe (3), the shaft surface bottom end of air pipe (3) is installed with air distribution box (4), the inside of air distribution box (4) is installed with isolation plate (20), the inner side of air distribution box (4) and the outer surface of isolation plate (20) are installed with rubber pad (12).

2. The low-frequency noise reduction device for a fresh air system according to claim 1, characterized in that: The inside of air distribution box (4) is installed with mounting rod (11) on both sides, the shaft surface of mounting rod (11) is inserted with first mounting frame (13), the shaft surface of mounting rod (11) is inserted with second mounting frame (14) on the inner side of first mounting frame (13), the shaft surface bottom end of mounting rod (11) is fixedly installed with third mounting frame (15) on the inner side of second mounting frame (14).

3. The low-frequency noise reduction device for a fresh air system according to claim 2, characterized in that: The inside of third mounting frame (15) is installed with several groups of third rubber foam (18), the opposite outer surfaces of second mounting frame (14) and third mounting frame (15) are installed with second rubber foam (17), the opposite outer surfaces of second mounting frame (14) and first mounting frame (13) are installed with first rubber foam (16).

4. The low-frequency noise reduction device for a fresh air system according to claim 3, characterized in that: The outer surface of first rubber foam (16), second rubber foam (17) and third rubber foam (18) is provided with several groups of noise reduction holes (19).

5. The low-frequency noise reduction device for a fresh air system according to claim 1, characterized in that: The outer surface rear end of air distribution box (4) is installed with polyurethane foam (2), the inner side of polyurethane foam (2) is installed with air guide pipe (5) on the outer surface rear end of air distribution box (4), the shaft surface corner of air guide pipe (5) is installed with noise reduction piece (6).

6. The low-frequency noise reduction device for a fresh air system according to claim 5, characterized in that: The inside of noise reduction piece (6) is installed with several groups of baffle (8), the inside of noise reduction piece (6) is installed with sponge (9) on the outer side corner, the opposite surface of sponge (9) in the inside of noise reduction piece (6) is installed with plant fiber sound absorbing cotton (10).

7. The low-frequency noise reduction device for a fresh air system according to claim 5, characterized in that: The shaft surface bottom end of air guide pipe (5) is installed with connecting section (7).

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