CN219388998U - Noise reduction structure for reducing airflow noise and flow loss - Google Patents

Abstract

The utility model relates to a silencing structure for reducing air flow noise and flow loss, which comprises an air passage pipe, wherein one side of the outer wall of the air passage pipe is provided with a resonant cavity cover with a cavity, a sealed resonant cavity is formed between the resonant cavity cover and the air passage pipe, the opposite side wall of the air passage pipe and the resonant cavity cover is provided with air holes, and the air passage pipe is communicated with the resonant cavity through the air holes so that air in the air passage pipe enters the resonant cavity through the air holes to realize silencing. According to the utility model, the resonant cavity cover with the cavity is arranged outside the air passage pipe to form the sealed resonant cavity, and meanwhile, the air hole is arranged between the air passage pipe and the resonant cavity, so that the air passage pipe is communicated with the resonant cavity through the air hole to form the muffler.

Description

Noise reduction structure for reducing airflow noise and flow loss

Technical Field

The utility model relates to the technical field of noise reduction, in particular to a noise reduction structure for reducing airflow noise and flow loss.

Background

The pneumatic products in the existing automobile seat comfort system are all provided with an air source for providing air for the main air channel, vibration noise is generated in the air source in the process of inflating the main air channel, so that the air in the air channel also contains the vibration noise, and in addition, the pneumatic products are also provided with a special electromagnetic valve for controlling the pressure of the main air channel, so that the influence on the service life of the automobile seat comfort system due to overlarge pressure of the main air channel is avoided; the electromagnetic valve is directly connected with the main air passage, and the pressure maintaining and air leakage of the air passage are controlled mainly through the electromagnet in the electromagnetic valve. The electromagnetic valve can also cause abnormal sound in the working process, so that the noise of the whole valve body is larger, and the comfort can be influenced.

Therefore, in order to reduce or even eliminate vibration noise contained in the gas in the air passage, the scheme adopted at present is to expand the cross section of the middle part of the air passage pipe, and to eliminate noise by utilizing reflection and interference phenomena caused by expansion and contraction of the air passage pipe, but the scheme can cause larger flow loss and has limited noise eliminating effect.

Disclosure of Invention

The utility model provides a silencing structure for reducing airflow noise and flow loss, which aims to solve the problems that the flow loss is relatively large, the silencing effect is limited and the like in the prior art by expanding the cross section of the middle part of an air passage pipe and silencing by utilizing reflection and interference phenomena caused by expansion and contraction of the air passage pipe.

The utility model provides a noise reduction structure of reduction air current noise and flow loss, includes the air flue pipe outer wall one side of air flue pipe is equipped with the resonant cavity lid that has the cavity, the resonant cavity lid with form sealed resonant cavity between the air flue pipe with the relative lateral wall of resonant cavity lid is equipped with the gas pocket, the air flue pipe passes through the gas pocket with resonant cavity intercommunication, so that gas in the air flue pipe passes through the gas pocket enters into realize the amortization in the resonant cavity. The air column in the air hole is similar to a piston and has certain sound quality, the sealed resonant cavity is similar to an air spring and has certain sound compliance, when sound waves are transmitted to a neck, the air column generates vibration under the action of sound pressure, friction damping during vibration converts part of sound energy into heat energy to dissipate, meanwhile, due to abrupt change of acoustic impedance, part of sound energy is reflected back to a sound source, when the frequency of sound waves is the same as the natural frequency of the resonant cavity, resonance is generated, the vibration speed of the air column reaches the maximum value, and the consumed sound energy is maximum. The muffler formed by combining the resonant cavities matched and sealed by the air holes has low resistance and small flow loss, and has the maximum silencing quantity for the set resonant frequency, thereby realizing better silencing effect.

Further, as a preferable technical scheme, a fixing base is extended from one side of the outer wall of the air passage pipe along the diameter direction of the air passage pipe, and the resonant cavity cover is mounted on the fixing base. The fixed base is used for installing a resonant cavity cover, and the size of the fixed base is determined according to the volume of the resonant cavity.

Further, as an optimized technical scheme, the resonance cavity cover further comprises a sealing ring, wherein an annular mounting groove capable of enabling the sealing ring to be embedded is formed in the fixing base along one circle of the fixing base, and the sealing ring is mounted in the annular mounting groove and abuts against the end portion of the resonance cavity cover. The sealing ring is used for sealing the resonant cavity cover with the fixed base, so that a sealed resonant cavity is formed, and the sealing effect is better.

Further, as a preferable technical scheme, the bottom end of the resonant cavity cover is fixed with the fixed base through adhesive sealing or welding.

Further, as a preferable technical scheme, first buckling parts are arranged on two opposite sides of the fixed base, second buckling parts are arranged on two opposite side walls of the resonant cavity cover towards the fixed base, and the bottom end of the resonant cavity cover is in buckling connection with the first buckling parts of the fixed base through the second buckling parts. The resonance cavity cover is in buckling connection with the fixing base through the first buckling part and the second buckling part, so that the resonance cavity cover is replaceable, namely, maintenance of the resonance cavity cover is facilitated, and meanwhile, the resonance cavity cover can be replaced according to the volume of the resonance cavity.

Further, as a preferable technical scheme, the first buckling part is a protrusion arranged on the side wall of the fixed base, the second buckling part is a buckling groove extending from the side wall of the resonant cavity cover to the direction of the fixed base, and the protrusion can be clamped into the buckling groove.

Further, as a preferable technical scheme, the inner diameter of the air passage pipe is determined according to the frequency band of the noise to be eliminated and the amount of the noise to be eliminated, and the inner diameter setting range of the air passage pipe is 1.5-5mm. The specific parameters of the inner diameter of the airway tube are determined according to the frequency band of the noise to be eliminated and the amount of noise to be eliminated.

Further, as a preferable technical scheme, the volume of the resonant cavity is determined according to the inner diameter of the airway tube and the diameter of the air hole, the diameter setting range of the air hole is 0.5-3mm, and the diameter of the air hole is smaller than the diameter of the airway tube. The diameter of the air hole and the inner diameter of the air passage pipe are used for calculating and determining the volume of the resonant cavity, so that the frequency band of noise to be eliminated and the quantity of noise to be eliminated are eliminated or reduced.

Further, as a preferable technical scheme, the number of the air holes is multiple, the distance between two adjacent air holes is at least 4 times of the diameter of the air hole, and the distance between the first air hole and the last air hole is smaller than the length of the resonant cavity. The specific number of the air holes can be determined and adjusted according to the volume of the resonant cavity.

Further, as a preferable technical scheme, the air-conditioning device further comprises a pressure regulating valve, wherein the pressure regulating valve is installed at one end of the air passage pipe and is positioned at one side of the resonant cavity cover, and the pressure regulating valve is communicated with the air passage pipe so as to control the air pressure of the air passage pipe.

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

the utility model forms a sealed resonant cavity by arranging the resonant cavity cover with the cavity outside the air passage pipe, and meanwhile, an air hole is arranged between the air passage pipe and the resonant cavity, so that the air passage pipe is communicated with the resonant cavity through the air hole, an air column in the air hole is similar to a piston and has certain sound quality, the sealed resonant cavity is similar to an air spring and has certain sound smoothness, the air column generates vibration under the action of sound pressure when sound waves are transmitted to a neck, the friction damping during vibration converts part of sound energy into heat energy to dissipate, meanwhile, part of sound energy is reflected back to a sound source due to sudden change of the sound impedance, when the frequency of the sound wave is the same as the natural frequency of the resonant cavity, resonance is generated, the vibration speed of the air column reaches the maximum, and the consumed sound energy is the maximum at the moment. The muffler formed by combining the air holes matched with the sealed resonant cavities has low resistance and small flow loss, and has the maximum silencing quantity for the set resonant frequency, thereby realizing better silencing effect.

Drawings

FIG. 1 is an exploded view of a muffler structure for reducing air flow noise and flow loss according to the present utility model.

Fig. 2 is a schematic structural diagram of a silencing structure for reducing airflow noise and flow loss.

Fig. 3 is a cross-sectional view of a silencing structure for reducing air flow noise and flow loss according to the present utility model.

Fig. 4 is a schematic diagram of an air passage pipe of a silencing structure for reducing air flow noise and flow loss.

Fig. 5 is a schematic diagram of a resonant cavity cover of a silencing structure for reducing airflow noise and flow loss according to the present utility model.

Detailed Description

The utility model is further described below in connection with the following detailed description.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if any, terms such as "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, only for convenience in describing the present utility model and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus the words describing the positional relationship in the drawings are merely for illustration and not to be construed as limiting the present patent.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are primarily intended to distinguish between different devices, elements, or components that may or may not be identical or different in specific type and configuration and are not intended to indicate or imply relative importance or quantity of the indicated devices, elements, or components.

Example 1

In order to overcome the problems of large flow loss, limited silencing effect and the like in the prior art, the cross section of the middle part of the air passage pipe is expanded, reflection and interference phenomena caused by expansion and contraction of the air passage pipe are utilized to carry out silencing, the silencing structure for reducing air flow noise and flow loss is disclosed, the silencing structure for reducing air flow noise and flow loss is provided with a resonant cavity cover with a cavity outside the air passage pipe to form a sealed resonant cavity, meanwhile, an air hole is arranged between the air passage pipe and the resonant cavity, so that the air passage pipe is communicated with the resonant cavity through the air hole, an air column in the air hole is similar to a piston, the air column is provided with a certain sound quality, the sealed resonant cavity is similar to an air spring, the air column is provided with a certain sound compliance, the air column is vibrated under the sound pressure effect when the sound wave is transmitted to a neck, friction damping during vibration converts part of sound energy into heat energy to be dissipated, meanwhile, due to the sudden change of acoustic impedance, when the frequency of the sound wave is identical with the resonant cavity, natural resonance is generated, the vibration speed of the air column reaches the maximum value, and the maximum sound energy consumption is maximized.

Specifically, referring to fig. 1, an exploded view of a silencing structure for reducing airflow noise and flow loss according to the present embodiment is shown.

Referring to fig. 2, a schematic structural diagram of a silencing structure for reducing airflow noise and flow loss according to the present embodiment is shown.

Referring to fig. 3, a cross-sectional view of a silencing structure for reducing airflow noise and flow loss according to the present embodiment is shown.

Therefore, as shown in fig. 1-3, the silencing structure for reducing airflow noise and flow loss disclosed in this embodiment includes an air duct 1, a resonant cavity cover 2 having a cavity is disposed on one side of an outer wall of the air duct 1, a sealed resonant cavity is formed between the resonant cavity cover 2 and the air duct 1, an air hole 3 is disposed on an opposite side wall of the air duct 1 from the resonant cavity cover 2, and the air duct 1 is communicated with the resonant cavity through the air hole 3, so that air in the air duct 1 enters into the resonant cavity through the air hole 3 to realize silencing.

The muffler formed by combining the air holes 3 matched with the sealed resonant cavities in the embodiment has low resistance, small flow loss and maximum silencing quantity for the set resonant frequency, and realizes better silencing effect

This embodiment is taken as a preferred embodiment, in this embodiment, the inner diameter of the airway tube 1 is determined according to the frequency band of noise to be eliminated and the amount of noise to be eliminated, and the inner diameter of the airway tube 1 is set in a range of 1.5-5mm.

Specifically, in the design process of the air passage pipe 1 in the present embodiment, the inner diameter thereof is determined according to the frequency band of the noise to be eliminated and the amount of the noise to be eliminated, whereas in view of the application of the present embodiment to the pneumatic system of the car seat, the inner diameter of the air passage pipe 1 is set in the range of 1.5-5mm.

This embodiment as a preferred embodiment, the inner diameter of the airway tube 1 may be set in the range of 2-3 mm.

Further, as a preferred embodiment, the volume of the resonant cavity is determined according to the inner diameter of the airway tube 1 and the diameter of the air hole 3, the diameter of the air hole 3 is set to be in the range of 0.5-3mm, and the diameter of the air hole 3 is smaller than the diameter of the airway tube 1. The diameter of the air hole 3 is set smaller than the diameter of the air passage pipe 1, and it is also understood that the air hole 3 is set with a certain depth, and the diameter of the air hole 3 is also related to the pipe wall thickness of the air passage pipe 1.

That is, in the present embodiment, the diameter of the air hole 3 and the inner diameter of the airway tube 1 are used to calculate and determine the volume of the resonant cavity, so that it is possible to achieve elimination or reduction of the frequency band of noise to be eliminated and the amount of noise to be eliminated.

In addition, in this embodiment, in order to achieve a better silencing effect, the number of air holes 3 is set to be 3-5, and the distance between two adjacent air holes 3 is at least 4 times the diameter of the air hole 3, and the distance between the first air hole 3 and the last air hole 3 is smaller than the length of the resonant cavity.

Preferably, in order to optimize the acoustic radiation between the air holes 3 without interference, the distance between two adjacent air holes 3 is set to be 5 times or more the diameter of the air hole 3.

Therefore, in designing the silencing structure for reducing the noise and flow loss of the air flow disclosed in this embodiment, it is required to determine which frequency band of the air channel 1 has high noise and needs to be eliminated, that is, determine which frequency band of noise needs to be eliminated, then determine the amount of noise to be eliminated, calculate the inner diameter of the air channel 1 according to the helmholtz resonator principle, the wall of the air channel 1 is determined according to the material of the air channel 1, after the inner diameter of the air channel 1 is determined, the volume of the resonant cavity is calculated, that is, the length of the resonant cavity cover 2 is limited by the length of the air channel 1, at this time, it is assumed that the diameter of the air hole 3 is a1, the depth of the air hole 3 is known according to the diameter setting range of the air hole 3, the depth of the air hole is smaller than the wall thickness of the air channel 1, the number of the air hole 3 is calculated according to the volume of the resonant cavity, and in view of the space between two adjacent air holes 3 is set to be 5 times the diameter of the air hole 3, and the length of the air channel 1 is combined, when the number of the air holes 3 is too many air holes, the inner diameter is determined, the air hole is calculated, the length of the air hole is calculated, that is the air hole is the size is further determined according to the volume of the air hole 3, the air hole 3 is calculated, the size is well as the size is calculated, and the size is well as the size of the air hole is well as the air hole 2, and the volume is well as the volume, the volume is well as the volume can be well as the volume size, the volume is well as the volume size.

In addition, the silencing structure for reducing airflow noise and flow loss disclosed in the present embodiment further includes a pressure regulating valve 6, where the pressure regulating valve 6 is installed at one end of the air passage pipe 1 and located at one side of the resonant cavity cover 2, and the pressure regulating valve 6 is communicated with the air passage pipe 1 to control the air pressure of the air passage pipe 1. The pressure regulating valve 6 disclosed in the present embodiment is a conventional pressure regulating valve, and is only used for controlling the air pressure in the air passage pipe 1, so as to realize the air leakage function, and the structure thereof is not specifically described in the present embodiment.

Example 2

The present embodiment discloses a silencing structure for reducing airflow noise and flow loss, which further discloses a connection structure of the resonant cavity cover 2 and the airway tube 1 on the basis of embodiment 1.

Referring to fig. 4, a schematic diagram of an air passage pipe in a silencing structure for reducing air flow noise and flow loss according to the present embodiment is shown.

Referring to fig. 5, a schematic diagram of a resonant cavity cover in a silencing structure for reducing airflow noise and flow loss according to the present embodiment is shown.

In this embodiment, as shown in fig. 4, the air duct 1 extends from one side of the outer wall of the air duct 1 along the diameter direction of the air duct 1 to form a fixed base 5, an annular mounting groove 51 is formed on the fixed base 5 along the circumference of the fixed base 5, a sealing ring 4 is formed in the annular mounting groove 51, and the bottom end of the resonant cavity cover 2 is mounted on the fixed base 5 and abuts against the sealing ring 4, so that sealing between the resonant cavity cover 2 and the fixed base 5 is achieved.

In this embodiment, as a preferred embodiment, the bottom end of the resonant cavity cover 2 and the fixed base 5 are fixed by adhesive sealing or welding, so that the resonant cavity cover 2 and the airway tube 1 are fixed into an integral structure.

Example 3

The present embodiment discloses a silencing structure for reducing airflow noise and flow loss, which further discloses another connecting structure of the resonant cavity cover 2 and the airway tube 1 on the basis of embodiment 1.

With continued reference to fig. 4, a schematic diagram of an air duct in a silencing structure for reducing airflow noise and flow loss according to the present embodiment is shown.

With continued reference to fig. 5, a schematic diagram of a resonant cavity cover in a silencing structure for reducing airflow noise and flow loss according to the present embodiment is shown.

In this embodiment, as shown in fig. 4, the air duct 1 extends from one side of the outer wall of the air duct 1 along the diameter direction of the air duct 1 to form a fixed base 5, an annular mounting groove 51 is formed on the fixed base 5 along the circumference of the fixed base 5, a sealing ring 4 is formed in the annular mounting groove 51, and the bottom end of the resonant cavity cover 2 is mounted on the fixed base 5 and abuts against the sealing ring 4, so that sealing between the resonant cavity cover 2 and the fixed base 5 is achieved.

Further, the first buckling portions 52 are provided on opposite sides of the fixing base 5, and the number of the first buckling portions 52 is at least 4, that is, 2 first buckling portions 52 are provided on one side of the fixing base 5.

In this embodiment, as shown in fig. 5, the two opposite side walls of the resonant cavity cover 2 are provided with second buckling parts 21 toward the direction of the fixed base 5, the number of the second buckling parts 21 is at least 4, one side of the resonant cavity cover 2 is provided with 2 second buckling parts 21, each second buckling part 21 corresponds to and is matched with one first buckling part 52, so that the bottom end of the resonant cavity cover 2 is in buckling connection with the first buckling part 52 of the fixed base 5 through the second buckling parts 21, and when the resonant cavity cover 2 is in buckling connection with the fixed base 5, the bottom end of the resonant cavity cover 2 abuts against the sealing ring 4, so that sealing between the resonant cavity cover 2 and the fixed base 5 is realized.

In this embodiment, as a preferred embodiment, the first buckling portion 52 is a protrusion provided on a side wall of the fixed base 5, and the second buckling portion 21 is a buckling groove extending from a side wall of the resonant cavity cover 2 toward the fixed base 5, and the protrusion can be snapped into the buckling groove.

In this embodiment, the resonant cavity cover 2 is connected to the fixed base 5 on the air duct tube 1 by the first buckling portion 52 and the second buckling portion 21, so that the resonant cavity cover 2 is replaceable, that is, the resonant cavity cover 2 is convenient to overhaul, and meanwhile, the resonant cavity cover 2 can be replaced according to the volume of the resonant cavity, that is, the frequency band and the noise amount of noise to be eliminated.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a noise reduction structure for reducing air current noise and flow loss, its characterized in that, includes air flue pipe (1) outer wall one side of air flue pipe (1) is equipped with resonant cavity lid (2) that have the cavity, resonant cavity lid (2) with form sealed resonant cavity between air flue pipe (1) with the opposite lateral wall of resonant cavity lid (2) is equipped with gas pocket (3), air flue pipe (1) pass through gas pocket (3) with resonant cavity intercommunication, so that gas in air flue pipe (1) passes through gas pocket (3) enter into realize the amortization in the resonant cavity.

2. The silencing structure for reducing air flow noise and flow loss as defined in claim 1, wherein a fixed base (5) is extended from one side of the outer wall of the air duct (1) along the diameter direction of the air duct (1), and the resonant cavity cover (2) is mounted on the fixed base (5).

3. The silencing structure for reducing air flow noise and flow loss according to claim 2, further comprising a sealing ring (4), wherein an annular mounting groove (51) capable of embedding the sealing ring (4) is formed on the fixing base (5) along the circumference of the fixing base (5), and the sealing ring (4) is mounted in the annular mounting groove (51) and abuts against the end part of the resonant cavity cover (2).

4. The silencing structure for reducing air flow noise and flow loss according to claim 2, wherein the bottom end of the resonant cavity cover (2) and the fixed base (5) are fixed by gluing, sealing or welding.

5. The silencing structure for reducing air flow noise and flow loss according to claim 2, wherein first buckling parts (52) are arranged on two opposite sides of the fixed base (5), second buckling parts (21) are arranged on two opposite side walls of the resonant cavity cover (2) towards the fixed base (5), and the bottom end of the resonant cavity cover (2) is in buckling connection with the first buckling parts (52) of the fixed base (5) through the second buckling parts (21).

6. The silencing structure for reducing air flow noise and flow loss according to claim 5, wherein the first buckling part (52) is a protrusion arranged on the side wall of the fixed base (5), the second buckling part (21) is a buckling groove extending from the side wall of the resonant cavity cover (2) towards the fixed base (5), and the protrusion can be clamped into the buckling groove.

7. The silencer structure for reducing air flow noise and flow loss according to claim 1, wherein the inner diameter of the air duct (1) is determined according to the frequency band of the noise to be eliminated and the amount of the noise to be eliminated, and the inner diameter of the air duct (1) is set to be 1.5-5mm.

8. The silencing structure for reducing air flow noise and flow loss as defined in claim 7, wherein the volume of the resonance chamber is determined according to the inner diameter of the air passage pipe (1) and the diameter of the air hole (3), the diameter of the air hole (3) is set to be in the range of 0.5-3mm, and the diameter of the air hole (3) is smaller than the diameter of the air passage pipe (1).

9. A silencing structure for reducing air flow noise and flow loss according to claim 8, wherein the number of said air holes (3) is plural, the interval between adjacent two of said air holes (3) is at least 4 times the diameter of said air holes (3), and the interval between the first one of said air holes (3) and the last one of said air holes (3) is smaller than the length of said resonant cavity.

10. The silencing structure for reducing air flow noise and flow loss as defined in claim 1, further comprising a pressure regulating valve (6), wherein the pressure regulating valve (6) is installed at one end of the air passage pipe (1) and located at one side of the resonance cavity cover (2), and the pressure regulating valve (6) is communicated with the air passage pipe (1) to control air pressure of the air passage pipe (1).