CN222459784U

CN222459784U - Noise reduction assembly and all-air system

Info

Publication number: CN222459784U
Application number: CN202420989291.0U
Authority: CN
Inventors: 陈遵荣; 蒙修仁; 雷朋飞; 宗毅; 易康明
Original assignee: Guangdong PHNIX Eco Energy Solution Ltd
Current assignee: Guangdong PHNIX Eco Energy Solution Ltd
Priority date: 2024-05-08
Filing date: 2024-05-08
Publication date: 2025-02-11
Anticipated expiration: 2034-05-08

Abstract

The utility model relates to a noise reduction component. The noise reduction component described in the utility model includes: a silencer box and a silencer structure; the silencer box is provided with a first air inlet, the first air inlet is conductively connected to the air outlet of the cabinet to be silenced, and the silencer structure is fixed in the silencer box; the silencer structure includes a plurality of first silencer layers, and the first silencer layers are provided with a plurality of silencer holes. The noise reduction component described in the utility model can effectively reduce the noise generated by the airflow output from the air outlet of the cabinet to be silenced, while reducing the airflow velocity, converting the airflow flow pressure into static pressure, and can better overcome the conveying resistance, so that the airflow can be conveyed to a farther distance space.

Description

Noise reduction assembly and all-air system

Technical Field

The utility model relates to the technical field of air conditioners, in particular to a noise reduction assembly and an all-air system.

Background

In an all-air system, external air flow is generally conveyed from an air inlet end of an air treatment unit cabinet to the inside of the air treatment unit cabinet for treatment, and the treated air flow is pumped out by a fan and conveyed to the external environment. In the past, the pipeline interface for conveying air flow is directly connected with the air outlet end of the fan, high-speed air pumped out from the fan generates great noise, and particularly when a plurality of all-air systems work in the same area, the noise is out of standard, so that the living of people is influenced, and even the physical health of people is damaged; in addition, the air flow pumped from the fan is directly conveyed through the pipeline and then is influenced by the resistance of the pipeline, so that the conveying distance of the air flow is limited.

Disclosure of utility model

The utility model aims to provide a noise reduction assembly, which is characterized in that a sound reduction box is arranged at the air outlet end of a cabinet body to be silenced, a sound reduction structure is arranged in the sound reduction box, the sound reduction box and the sound reduction structure are designed, so that noise generated by air flow output by the air outlet end of the cabinet body to be silenced can be effectively reduced, meanwhile, the air flow speed can be reduced, dynamic pressure of the air flow is converted into static pressure, the conveying resistance can be better overcome, the air flow can be conveyed to a space region with a longer distance, and the heat exchange rate of a system is improved.

The utility model further aims to provide an all-air system, which can effectively reduce noise generated by air flow output by the air outlet end of the cabinet body to be silenced by arranging the noise reduction assembly at the air outlet end of the cabinet body to be silenced, and can reduce the air flow speed, convert dynamic pressure of the air flow into static pressure, enable the air flow to be conveyed to a space region with a longer distance, and improve the heat exchange rate of the system.

A noise reduction assembly, comprising:

A sound-deadening box and a sound-deadening structure;

The silencing box is provided with a first air inlet, the first air inlet is in conduction connection with the air outlet end of the cabinet body to be silenced, and the silencing structure is fixedly arranged in the silencing box;

The silencing structure comprises a plurality of first silencing layers, and a plurality of silencing holes are formed in the first silencing layers.

Further, the diameter of the silencing hole is 1 mm-3 mm;

The plurality of the silencing holes are distributed at equal intervals, and the distance between the centers of every two adjacent silencing holes is larger than 5 times of the diameter of the silencing hole.

Further, the air outlet end of the cabinet body to be silenced is provided with a cabinet body air outlet, and the total area of a plurality of silencing holes is larger than 1.5-2 times of the area of the cabinet body air outlet.

Further, the silencing structure further comprises a second silencing layer and a third silencing layer, and the first silencing layer is clamped between the second silencing layer and the third silencing layer;

And defining the thickness of the third silencing layer as h, wherein the thickness ratio of the first silencing layer to the second silencing layer to the third silencing layer is (7.5-20) h (2-4) h: h.

Further, the diameter of the silencing hole is 1.5-2.5 mm;

the distance between the centers of every two adjacent silencing holes is 7.5-12.5 mm;

the total area of the plurality of silencing holes is 1.8-2 times larger than the area of the air outlet of the cabinet body;

The thickness of the first silencing layer is 10-15 mm, the thickness of the second silencing layer is 3-4 mm, and the thickness of the third silencing layer is 1-2 mm.

Further, the silencing structure is attached to the wall surface of the inner cavity of the silencing box.

Further, the air inlet end of the cabinet body to be silenced is provided with an air inlet box, the air outlet end of the air inlet box is connected with the air inlet end of the cabinet body to be silenced in a conducting mode, and the wall surface of the inner cavity of the air inlet box is provided with the silencing structure in a pasting mode.

Further, the first air inlet is provided with an air outlet which is equal to or larger than the cabinet body, and the cross section area of the silencing box along the air flow direction is larger than the opening area of the air outlet of the cabinet body;

The air inlet end of the air inlet box is provided with a second air inlet, and the cross section area of the air inlet box along the air flow direction is larger than the opening area of the second air inlet.

Further, the end face of the air inlet end of the silencing box is provided with a plurality of clamping plates, the end face of the air outlet end of the cabinet body to be silenced is provided with a matched clamping groove, and the clamping plates are clamped in the clamping groove, or the end face of the air outlet end of the cabinet body to be silenced is provided with a plurality of clamping plates, the end face of the air inlet end of the silencing box is provided with a matched clamping groove, and the clamping plates are clamped in the clamping groove;

And a sealing piece is arranged at the joint of the silencing box and the cabinet body to be silenced.

An all-air system comprises the noise reduction assembly and an air inlet box.

The utility model has the beneficial effects that:

(1) The silencing box is arranged at the air outlet end of the cabinet body to be silenced, the silencing structure is arranged in the silencing box, and the silencing box and the silencing structure are designed, so that noise generated by air flow output by the air outlet end of the cabinet body to be silenced can be effectively reduced;

(2) Simultaneously, each parameter of the multi-layer silencing layer of the silencing structure is optimally designed, so that the silencing effect of the silencing structure is further improved, and the noise is further reduced;

(3) By arranging the silencing structure in the air inlet box of the all-air system, the overall noise of the all-air system can be reduced;

(4) The silencing box is fixedly connected with the cabinet body to be silenced in a clamping manner, so that noise generated by vibration of the unit during operation can be reduced, and silencing boxes with different sizes can be replaced at any time according to actual requirements;

Through setting up the sealing member in the junction, can prevent that the air current from flowing out from the gap of junction from causing the air current loss and producing noise, can also further stabilize the connection between the amortization box and the cabinet body of waiting to amortize, and then reduce the noise that the internal unit of waiting to amortize produced by vibration when operation.

For a better understanding and implementation, the present utility model is described in detail below with reference to the drawings.

Drawings

FIG. 1 is a schematic diagram of a noise reduction assembly mounting structure according to an embodiment of the present application;

FIG. 2 is an exploded view of a noise reduction assembly mounting structure provided by an embodiment of the present application;

FIG. 3 is a schematic view of a silencing structure according to an embodiment of the present application;

FIG. 4 is an enlarged view of a first muffler layer according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an all-air system according to an embodiment of the present application.

The air conditioner comprises a cabinet body to be silenced, an air outlet of the cabinet body 1a, a sound-deadening box 10, a first air inlet 11, a clamping plate 12, a clamping groove 12a, a 20-sound-deadening structure 21, a first sound-deadening layer 22, a third sound-deadening layer 23, a sound-deadening hole 21a, a 30-air inlet box 31 and a second air inlet.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, and are constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected via an intermediary, or connected by communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The problem that a large amount of noise is generated when the all-air system operates is solved, and the noise at the air outlet of the all-air system is mainly generated by the noise generated by airflow, the noise generated by vibration when the unit operates, the noise generated by friction between the airflow and the pipeline wall and the like. The noise generated by the airflow is related to the airflow speed, the greater the flow speed is, the greater the generated noise is, therefore, the noise generated by the airflow at the air outlet of the fan is the greatest, if the air speed at the air outlet of the fan is directly led to the external environment through the external air outlet pipeline, even if the speed of the airflow flowing through the pipeline is reduced due to the influence of the pipeline resistance, the flow speed of the airflow coming out of the outlet of the pipeline is still greater, and larger noise is necessarily generated, therefore, an assembly capable of reducing the airflow speed is needed to be arranged to reduce the noise in the air outlet process, and meanwhile, an effective silencing structure is designed to absorb the noise.

Based on the above, the utility model provides a noise reduction assembly, which is characterized in that a noise reduction box is arranged at the air outlet end of a cabinet body to be silenced so as to reduce the flow velocity of air flow, convert the dynamic pressure of the air flow into static pressure, and meanwhile, a noise reduction structure is arranged in the noise reduction box, and the noise reduction structure is designed and optimized for each parameter so that the noise reduction structure can effectively absorb the noise generated in the air flow output by the air outlet end of the cabinet body to be silenced.

Referring to fig. 1 and 2, an embodiment of the present application provides a noise reduction assembly, which relates to a cabinet body 1 to be silenced, wherein the cabinet body 1 to be silenced is an all-air treatment equipment cabinet body, a surface cooler and a fan (not shown) are arranged in the cabinet body, the surface cooler processes air flow entering the all-air treatment equipment cabinet body, and the air flow is pumped to the outside of the all-air treatment equipment cabinet body through the fan. The noise reduction assembly includes a sound reduction box 10 and a sound reduction structure 20. The silencing box 10 is provided with a first air inlet 11, the first air inlet 11 is connected with the air outlet end of the cabinet body 1 to be silenced in a conducting mode, and the silencing structure 20 is fixedly arranged in the silencing box 10.

Specifically, the air outlet end of the cabinet body 1 to be silenced is provided with a cabinet body air outlet 1a, and the connection position of the silencing box 10 and the cabinet body 1 to be silenced is determined by the opening position of the cabinet body air outlet 1 a. In this embodiment, since the cabinet air outlet 1a is opposite to the fan air outlet, and the fan is fixedly disposed at the top of the cabinet 1 to be silenced, the silencing box 10 is fixedly disposed on the top outer wall of the cabinet 1 to be silenced. The first air inlet 11 is arranged on one surface of the sound-reducing box 10, and the first air inlet 11 is connected with the cabinet air outlet 1a in a conducting way, so that air flows into the sound-reducing box 10 from the cabinet air outlet 1a and flows to an external area from the air outlet end of the sound-reducing box 10 through an external air outlet pipeline. The air outlet end of the sound-deadening box 10 may be disposed on any surface of the sound-deadening box 10, where the first air inlet 11 is not disposed, and preferably, the air outlet end of the sound-deadening box 10 is disposed on a surface opposite to the first air inlet 11, and the first air inlet 11 is opposite to the cabinet air outlet 1a, so as to avoid extra wind resistance generated by bending the airflow in the sound-deadening box 10.

It is understood that, according to the formula of air volume=wind speed×cross-sectional area, it is known that, in the case of a certain air volume, the wind speed is inversely proportional to the cross-sectional area through which air flows. In this embodiment, since the cabinet air outlet 1a is disposed at the air outlet end of the blower, the air volume at the cabinet air outlet 1a is rated under the condition that the power of the blower is constant. As an exemplary embodiment, the silencer 10 is a square column box body with the same cross section along the airflow direction, the opening size of the first air inlet 11 is equal to or larger than the cabinet air outlet 1a, the cross section area of the cabinet air outlet 1a is 495mm×245mm, the cross section area of the internal cavity of the silencer 10 is 642mm×600mm, the rated air volume of the air from the cabinet air outlet 1a is 3000m ³/h, it can be obtained that the air speed of the cabinet air outlet 1a is 6.8m/h, and the air speed when the air flows into the internal cavity of the silencer 10 is reduced to 2.1m/s. From this, the air flow enters the sound-reducing box 10 from the cabinet air outlet 1a, and the speed becomes low, and the noise becomes low. In addition, the air flow in this embodiment can be regarded as ideal fluid, according to the principle of conservation of energy when ideal fluid makes steady flow, when the air flow speed becomes small, the dynamic pressure inside the silencer 10 becomes small, the dynamic pressure is converted into static pressure, the static pressure is increased, the large static pressure has stronger capability of overcoming the conveying resistance, which means that the air flow loss of the static pressure air flow is smaller under the condition that the lengths of the external air outlet pipelines are the same, therefore, when the cross section area of the silencer 10 along the air flow direction is larger than the opening area of the air outlet 1a of the cabinet body, the air flow speed can be reduced, the noise can be reduced, and at the moment, the dynamic pressure is converted into the static pressure, and the air flow can be conveyed to a farther space area. It should be noted that, when the first air inlet 11 is smaller than the cabinet air outlet 1a, the air flow flows through the connection between the cabinet air outlet 1a and the first air inlet 11, and the air flow speed is rapidly increased due to the air flow from the large cross section to the small cross section, so that the first air inlet 11 needs to be opened to be equal to or larger than the cabinet air outlet 1a.

The end face of the air inlet end of the silencing box 10 is provided with a plurality of clamping plates 12, the end face of the air outlet end of the cabinet body 1 to be silenced is provided with a clamping groove 12a which is matched with the clamping plate 12a, and the clamping plates 12 are clamped in the clamping groove 12a so that the end face of the air inlet end of the silencing box 10 is abutted against the end face of the air outlet end of the cabinet body 1 to be silenced. Or the end face of the air outlet end of the cabinet body 1 to be silenced is provided with a plurality of clamping plates 12, the end face of the air inlet end of the silencing box 10 is provided with a clamping groove 12a which is matched with the clamping plate 12a, and the clamping plates 12 are clamped in the clamping groove 12a. It will be appreciated that when the opening of the first air inlet 11 is equal to or greater than the air outlet 1a of the cabinet and smaller than the air inlet end of the muffler box 10, the clamping plate 12 may be disposed at any position of the air inlet end of the muffler box 10. The silencing box 10 is fixedly connected with the cabinet body 1 to be silenced in a clamping and inserting mode, connection stability is guaranteed while connection is facilitated, noise generated by vibration during unit operation is reduced, and the silencing box 10 with different sizes can be replaced at any time according to actual requirements.

In other embodiments, the edge of the first air inlet 11 is surrounded by a connecting piece, the connecting piece protrudes out of the outer wall of the sound-reducing box 10, and the shape and the size of the surrounding connecting piece are matched with those of the cabinet air outlet 1a, so that the connecting piece is firmly inserted into the cabinet air outlet 1a. Or the edge of the air outlet 1a of the cabinet body is surrounded by a connecting piece, the connecting piece protrudes out of the outer side of the cabinet body 1 to be silenced, and the shape and the size of the surrounding connecting piece are matched with those of the first air inlet 11, so that the connecting piece is firmly inserted into the first air inlet 11.

As a further embodiment, a sealing member is arranged at the connection between the sound-deadening box 10 and the cabinet body 1 to be deadened. Specifically, the sealing member encloses the surface of the junction of the sound-deadening box 10 and the cabinet body 1 to be deadened. In other embodiments, the sealing member is sandwiched between the connecting member and the cabinet air outlet 1a or between the connecting member and the first air inlet 11. The seal is made of a material which has good sealing performance and has a buffer effect, and is preferably a rubber seal. Through setting up the sealing member, on the one hand can prevent that the air current from flowing out from the gap of amortization case 10 and waiting to amortize cabinet body 1 junction and cause the air current loss to and the noise of simultaneous production, on the other hand can further stabilize the connection between amortization case 10 and the cabinet body air outlet 1a, and then reduce the noise that vibrations produced when waiting to amortize the internal unit operation of cabinet body 1.

Referring to fig. 3 and fig. 4, the silencing structure 20 includes a plurality of first silencing layers 21, a second silencing layer 22 and a third silencing layer 23, wherein a plurality of silencing holes 21a are formed in the first silencing layer 21 and are clamped between the second silencing layer 22 and the third silencing layer 23, and the first silencing layer 21, the second silencing layer 22 and the third silencing layer 23 are tightly attached to each other to form an integral structure. The first sound-deadening layer 21 is a sound-deadening layer made of a noise-deadening material, and may specifically be a sound-deadening layer made of a sound-deadening material, a sound-absorbing material, or a material having good reflection performance for sound waves, preferably a sound-absorbing material, having good sound-absorbing effect for noise. The second noise reduction layer 22 is a noise reduction layer made of a vibration/noise reduction material, and may specifically be a noise reduction layer made of rubber, damping glue or the like, preferably damping glue, and the damping glue layer has a good sound absorption effect and a vibration reduction function so as to reduce noise by reducing vibration of the noise reduction box 10. The third silencing layer 23 is made of metal material, and may be zinc foil layer, aluminum foil layer, etc. preferably aluminum foil layer, which has good noise reflecting and blocking effect, and can reflect and block sound wave, and has good heat insulating effect, so as to avoid heat loss caused by heat transfer of hot air or cold air flowing out from the air outlet 1a of the cabinet body in the silencing box 10.

In order to further enhance the sound absorbing effect, parameters such as the size of the sound absorbing holes 21a, the distance between the centers of every two adjacent sound absorbing holes 21a, the thickness of each sound absorbing layer, and the like are optimally designed. In this embodiment, in order to ensure that the maximum friction force is generated between the shortest wavelength sound wave in the auditory range of the human ear and the sound deadening hole 21a to obtain the maximum sound deadening coefficient, the diameter of the sound deadening hole 21a is 1mm to 3mm. Meanwhile, the plurality of silencing holes 21a are uniformly distributed at equal intervals, when the distance between the centers of two adjacent silencing holes 21a is too short, the quantity of the silencing holes 21a is distributed more, the area of silencing cotton is correspondingly smaller, and the silencing cotton has a higher silencing coefficient, so that the silencing coefficient of the whole silencing layer can be reduced, and therefore, the distance between the centers of every two adjacent silencing holes 21a is larger than 5 times of the diameter of the silencing hole 21 a. In addition, in order to ensure a sufficiently large area of the sound deadening layer, the total area of the plurality of sound deadening holes 21a is 1.5 to 2 times larger than the area of the cabinet air outlet 1a, and it should be noted that the total area of the sound deadening holes 21a cannot be increased by merely reducing the distance between the centers of the adjacent sound deadening holes 21a, and as described above, the distance between the centers of the adjacent sound deadening holes 21a needs to ensure that the sound deadening layer has a large sound deadening coefficient, so that the total area of the sound deadening holes 21a needs to be increased by increasing the laying area of the whole sound deadening structure 20 at a constant distance between the centers of the adjacent sound deadening holes 21 a. Furthermore, the thickness of the first silencing layer 21, the second silencing layer 22 and the third silencing layer 23 is designed, under the condition of improving the silencing coefficient, the total thickness of the three silencing layers is not thicker, the thicker silencing layer is adhered to the inside of the silencing box 10, so that larger wind resistance is caused, and as mentioned above, the cross section area of the silencing box 10 is reduced, the reduction of wind speed and the pressure conversion of air flow are not facilitated, therefore, the thickness ratio of the first silencing layer 21, the second silencing layer 22 and the third silencing layer 23 is (7.5-20) h (2-4) h: h, wherein h is the thickness of the third silencing layer 23. Preferably, the diameter of the silencing holes 21a is 1.5-2.5 mm, the distance between the centers of every two adjacent silencing holes 21a is 7.5-12.5 mm, the total area of the silencing holes 21a is 1.8-2 times larger than the area of the cabinet air outlet 1a, the thickness of the first silencing layer 21 is 10-15 mm, the thickness of the second silencing layer 22 is 3-4 mm, and the thickness of the third silencing layer 23 is 1-2 mm. Most preferably, the diameter of the silencing holes 21a is 2mm, the distance between the centers of every two adjacent silencing holes 21a is 10mm, the total area of the silencing holes 21a is 2 times larger than the area of the cabinet air outlet 1a, the thickness of the first silencing layer 21 is 15mm, the thickness of the second silencing layer 22 is 2mm, and the thickness of the third silencing layer 23 is 1mm.

The silencing structure 20 is attached to the wall surface of the inner cavity of the silencing box 10. Specifically, the second muffler layer 22 is in contact with the inner cavity wall surface of the muffler case 10, or the third muffler layer 23 is in contact with the inner cavity wall surface of the muffler case 10. In this embodiment, the second muffler layer 22 is in contact with the inner cavity wall surface of the muffler case 10. Compared with the single-layer silencing layer, the multi-layer silencing structure 20 has better noise reduction effect, and the specific silencing process is that when noise reaches the third silencing layer 23, a part of sound waves are reflected and blocked by the third silencing layer 23, return to the inside of the silencing box 10, the noise intensity is reduced, the rest part of the sound waves penetrate through the third silencing layer 23 and enter the second silencing layer 22, friction is generated between the sound waves and the wall surface of the silencing hole 21a in the second silencing layer 22, part of the sound waves are converted into heat energy to be dissipated, the sound waves passing through the second silencing layer 22 are weakened, so that the noise intensity is further reduced, in addition, the noise passing through the second silencing layer 22 enters the first silencing layer 21, the damping glue layer of the first silencing layer 21 not only can absorb the sound waves, but also further reduces the noise intensity by reducing vibration, and finally only a trace amount of noise is transmitted to the outside from the silencing box 10.

Referring to fig. 5, further, an air inlet box 30 is disposed at an air inlet end of the cabinet body 1 to be silenced, an air outlet end of the air inlet box 30 is connected with the air inlet end of the cabinet body 1 to be silenced in a conducting manner, a second air inlet 31 is disposed at the air inlet end of the air inlet box 30, the second air inlet 31 is used for connecting an external air inlet pipe, and the external air inlet pipe guides external air flow into the air inlet box 30 and then flows into the cabinet body 1 to be silenced for treatment. In this process, a large amount of noise is also generated, and in order to reduce the noise generated during the air intake process of the air intake box 30, the wall surface of the inner cavity of the air intake box 30 is adhered with the silencing structure 20. Similarly, the second muffler layer 22 may be in contact with the inner cavity wall surface of the air inlet box 30, or the third muffler layer 23 may be in contact with the inner cavity wall surface of the air inlet box 30. In this embodiment, the second silencing layer 22 is abutted against the wall surface of the inner cavity of the air inlet box 30, when the air flows into the air inlet box 30 from the second air inlet 31, the sound wave generated by the air flow is firstly transmitted to the third silencing layer 23, the third silencing layer 23 reflects and blocks a part of sound wave, another part of sound wave is transmitted into the first silencing layer 21, friction is generated between the sound wave and the wall surface of the silencing hole 21a in the second silencing layer 22, a part of sound energy is converted into heat energy to be dissipated, the rest of sound wave is transmitted into the second silencing layer 22, the second silencing layer 22 further absorbs the sound wave, and the noise reduction effect can be achieved by reducing the vibration of the air inlet box 30.

Further, the opening size of the second air inlet 31 and the cross-sectional area size of the air inlet box 30 are analyzed. As an exemplary embodiment, the air inlet box 30 is a square column box body with the same cross section along the air flow direction, the cross section area of the second air inlet 31 is 495mm×245mm, the cross section area of the inner cavity of the air inlet box 30 is 600mm×300mm, the rated air quantity entering the air inlet box 30 from the second air inlet 31 is 3000m ³/h, it can be obtained that the air speed of the air at the second air inlet 31 is 6.8m/h, and the air speed when the air flows into the inner cavity of the air inlet box 30 is reduced to 4.6m/s. The air flow enters the air inlet box 30 from the second air inlet 31, the speed becomes low, and the noise becomes low. In addition, the external air inlet pipeline is conveyed to the second air inlet 31 to be an ideal fluid, according to the principle of energy conservation when the ideal fluid is subjected to steady flow, when the speed of the air flow is reduced, the dynamic pressure in the air inlet box 30 is reduced, the dynamic pressure is converted into the static pressure, the static pressure is increased, the capacity of overcoming the conveying resistance by the large static pressure is stronger, and therefore the static pressure air flow loss is smaller after the air flow passes through the air inlet box 30, the air flow input from the outside is reduced, the power required by the input air flow is reduced, and the energy consumption is further reduced. Therefore, when the cross-sectional area of the air inlet box 30 along the air flow direction is larger than the opening area of the second air inlet 31, not only the air flow speed can be reduced to reduce noise, but also the dynamic pressure is converted into the static pressure at this time, so that the loss of the air flow through the air inlet box 30 can be reduced.

Also, as a further embodiment, a sealing member is provided at the junction of the second air inlet 31 and the external air inlet duct. The sealing member may be sandwiched between the second air inlet 31 and the external air inlet pipe, or may be enclosed on the outer surface of the junction between the external air inlet pipe and the air inlet box 30. The seal is made of a material which has good sealing performance and has a buffer effect, and is preferably made of a rubber material. By providing the sealing member, it is possible to prevent the air flow from flowing out of the slit at the joint to cause air flow loss and noise generated at the same time.

The embodiment of the application also provides an all-air system, which comprises any one of the noise reduction assemblies and an air inlet box 30.

Compared with the prior art, the technical scheme of the application has the beneficial effects that:

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and the utility model is intended to encompass such modifications and improvements.

Claims

1. The noise reduction assembly is characterized by comprising:

A sound-deadening box and a sound-deadening structure;

2. The noise reduction assembly of claim 1, wherein:

the diameter of the silencing hole is 1 mm-3 mm;

3. The noise reduction assembly of claim 2, wherein:

The cabinet body air outlet end that waits to amortize is equipped with cabinet body air outlet, a plurality of amortization hole total area is greater than 1.5~2 times of cabinet body air outlet area.

4. A noise reduction assembly as claimed in claim 3, wherein:

The silencing structure further comprises a second silencing layer and a third silencing layer, and the first silencing layer is clamped between the second silencing layer and the third silencing layer;

5. The noise reduction assembly of claim 4, wherein:

The diameter of the silencing hole is 1.5-2.5 mm;

6. The noise reduction assembly of claim 5, wherein:

the silencing structure is attached to the wall surface of the inner cavity of the silencing box.

7. The noise reduction assembly of claim 6, wherein:

The air inlet end of the cabinet body to be silenced is provided with an air inlet box, the air outlet end of the air inlet box is connected with the air inlet end of the cabinet body to be silenced in a conducting mode, and the wall surface of the inner cavity body of the air inlet box is provided with the silencing structure in a pasting mode.

8. The noise reduction assembly of claim 7, wherein:

The first air inlet is provided with an air outlet which is equal to or larger than the cabinet body, and the cross section area of the silencing box along the air flow direction is larger than the opening area of the air outlet of the cabinet body;

9. The noise reduction assembly of claim 8, wherein:

The end face of the air inlet end of the silencing box is provided with a plurality of clamping plates, the end face of the air outlet end of the cabinet body to be silenced is provided with a matched clamping groove, and the clamping plates are clamped in the clamping groove;

10. An all-air system, characterized by:

A noise reduction assembly as defined in any one of claims 1 to 9.