CN216518336U

CN216518336U - Noise reduction air passage, engine and operation machine

Info

Publication number: CN216518336U
Application number: CN202122748726.1U
Authority: CN
Inventors: 刘敏; 张咏琳; 钱凯
Original assignee: Hunan Deutz Power Co Ltd
Current assignee: Hunan Deutz Power Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-13
Anticipated expiration: 2031-11-10

Abstract

The utility model relates to the technical field of operation machinery, and aims to provide a noise reduction air passage, an engine and operation machinery, which have the advantages of good noise reduction effect, no occupation of arrangement space and low cost. The noise reduction air passage comprises an air inlet passage and/or an air outlet passage, wherein noise reduction structures corresponding to at least one noise frequency are formed in the inner walls of the air inlet passage and the air outlet passage. The utility model solves the problems that the existing noise reduction structure of the engine is externally arranged on an external pipeline of the engine, has larger volume, occupies large arrangement space, has higher cost and has large noise reduction effect limitation.

Description

Noise reduction air passage, engine and operation machine

Technical Field

The utility model relates to the technical field of operation machinery, in particular to a noise reduction air passage, an engine and operation machinery.

Background

The noise of the engine is one of main sources of the noise of the whole vehicle, which can cause adverse effect on the comfort of the whole vehicle, especially, the diesel engine adopts a compression ignition mode, the detonation pressure of the compression ignition mode is obviously higher than that of a gasoline engine, and the noise of the diesel engine is often more obvious than that of the gasoline engine under the condition of the same rotating speed. Therefore, the engine noise reduction is the key of the passing noise index of the whole vehicle and is an important measure for improving the comfort of the whole vehicle.

At present, aiming at noise reduction measures of an engine, a large resonant cavity muffler is mainly arranged on an air inlet and exhaust pipeline outside the engine, and because the resonant cavity of the muffler is usually large in volume and is mainly used for eliminating middle and low frequency range noise, most of the noise of the engine at present is middle and high frequency range noise of 800-.

The prior art discloses an air inlet silencing structure of an engine, wherein a silencer is mounted at an air inlet hose of the engine and consists of a perforated pipe and a sleeve sleeved outside the perforated pipe, a space between the perforated pipe and the sleeve is divided into five resonant cavities by four partition plates between the outer wall of the perforated pipe and the inner wall of the sleeve, and the volume of each resonant cavity is gradually increased along the air inlet direction, so that noises in different frequency bands are eliminated. However, the noise reduction structure can only reduce noise outside the engine, and the main source of the engine noise is inside the engine body, the noise reduction mode cannot fundamentally reduce the engine noise, the noise reduction effect is limited to intake noise, and the noise reduction effect is ineffective to exhaust noise.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects of large volume, large occupied arrangement space, high cost and large noise reduction effect limitation of the noise reduction structure of the engine in the prior art, so that the noise reduction air channel, the engine and the working machine which have the advantages of good noise reduction effect, no occupied arrangement space and low cost are provided.

In order to solve the above problems, the present invention provides a noise reduction air duct, which includes an air inlet duct and/or an air outlet duct, wherein a noise reduction structure corresponding to at least one noise frequency is formed inside inner walls of the air inlet duct and the air outlet duct.

Optionally, the noise reduction structure is a plurality of resonance chambers arranged at intervals, the resonance chambers are recessed inwards from the inner walls of the air inlet passage and the air outlet passage, and the resonance chambers are only provided with openings on the inner walls of the air inlet passage and the air outlet passage.

Optionally, the resonance chamber includes a first chamber and a second chamber that are communicated with each other, the first chamber is further communicated with the internal flow passage of the intake passage and the exhaust passage, and a volume of the second chamber is greater than a volume of the first chamber.

Optionally, the volume ratio of the second chamber to the first chamber is greater than or equal to 10.

Optionally, the first chamber and the second chamber are both cylindrical chambers.

Optionally, the noise reduction frequencies corresponding to the resonance chambers are different, or the noise reduction frequencies corresponding to a part of the resonance chambers are different, and the noise reduction frequencies corresponding to another part of the resonance chambers are the same.

Optionally, the air inlet channel includes an air inlet main channel and at least two air inlet branch channels, the air inlet main channel is communicated with the air inlet branch channels, and the noise reduction structure is arranged on the inner wall of the air inlet main channel and/or the air inlet branch channels; the exhaust passage comprises an exhaust main passage and at least two exhaust branch passages, the exhaust main passage is communicated with the exhaust branch passages, and the inner walls of the exhaust main passage and/or the exhaust branch passages are provided with the noise reduction structures.

An engine comprises an engine body and the noise reduction air passage, wherein the noise reduction air passage is arranged in the engine body.

Optionally, the noise reduction air passage is a cylinder head air passage of the engine.

A working machine comprises a vehicle body and the engine, wherein the engine is arranged in the vehicle body.

The utility model has the following advantages:

(1) according to the noise reduction air passage provided by the utility model, the noise reduction structure corresponding to at least one noise frequency is formed on the inner walls of the air inlet passage and the air exhaust passage, the noise reduction structure is formed on the inner walls of the air inlet passage and the air exhaust passage, noise reduction can be realized without additionally arranging other equipment, and the arrangement space is greatly saved.

(2) The noise reduction air passage provided by the utility model has the advantages that the noise reduction structure is provided with a plurality of resonance chambers which are arranged at intervals, the resonance chambers are recessed inwards from the inner walls of the air inlet passage and the air outlet passage, and only the inner walls of the air inlet passage and the air outlet passage are provided with openings, the resonance chambers of the structure skillfully utilize the inner walls of the air inlet passage and the air outlet passage to form a small Helmholtz resonance cavity, the noise of the air inlet passage and the air outlet passage can be effectively reduced, the noise reduction effect is good, particularly, the middle and high frequency range noise of 800 plus 5000Hz can be effectively reduced, and the noise reduction air passage is suitable for various engines, such as gasoline engines, diesel engines and the like.

(3) The noise reduction air passage provided by the utility model has the advantages that the noise reduction structure can be arranged on the air inlet main passage and/or the air inlet branch passage and the air outlet main passage and/or the air outlet branch passage, the arrangement position is flexible, and the noise reduction structure can be selected according to the structure space, the use requirement and the like.

(4) The engine provided by the utility model comprises the noise reduction air passage, and the noise reduction air passage is arranged in the engine body, so that noise can be reduced from the main source of engine noise, the noise reduction effect is greatly improved, the arrangement space is not occupied, and the manufacturing cost is low.

(5) According to the engine provided by the utility model, the noise reduction air passage is the cylinder cover air passage of the engine, the cylinder cover air passage is the metal air passage, the noise reduction structure is easier to machine and form, and the noise reduction structure is more stable and reliable.

(6) The working machine provided by the utility model comprises the engine, and the noise reduction air passage provided by the utility model is arranged in the engine, so that the noise of the whole working machine can be greatly reduced, the comfort of the whole working machine is effectively improved, and the popularization and the use of the working machine are facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a schematic view of a noise reducing airway of the present invention;

FIG. 2 is a first enlarged schematic view of the resonating chambers in the noise reducing airway of the present invention;

fig. 3 shows an enlarged schematic view of the resonance chambers in the noise reduction airway of the present invention.

Description of reference numerals:

1-an air inlet channel, 101-an air inlet main channel, 102-an air inlet branch channel, 103-an air inlet channel inlet and 104-an air inlet channel outlet;

2-exhaust passage, 201-exhaust main passage, 202-exhaust branch passage, 203-exhaust passage inlet, 204-exhaust passage outlet;

3-resonance chamber, 301-opening, 302-first chamber, 303-second chamber.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a preferred embodiment of the noise reduction duct of the present invention is shown, and the noise reduction duct of the present invention is suitable for various types of engines, such as diesel engines, gasoline engines, and the like.

The noise reduction air passage comprises an air inlet passage 1 and/or an air outlet passage 2, namely, the air inlet passage can be designed or used as the noise reduction air passage according to actual needs, the air outlet passage can be designed or used as the noise reduction air passage, or both the air inlet passage and the air outlet passage can be designed or used as the noise reduction air passage.

In this embodiment, the noise reduction air passage includes an air inlet passage 1 and an air outlet passage 2, so that both the air inlet side and the air outlet side can effectively reduce noise, and the noise reduction effect is optimal.

The intake duct 1 includes an intake manifold 101 and at least two intake branch ducts 102, the intake manifold 101 is communicated with the intake branch ducts 102, specifically, an intake duct inlet 103 is provided at an upstream of the intake manifold 101, a downstream of the intake manifold 101 is communicated with an upstream of the intake branch ducts 102, and an intake duct outlet 104 is provided at a downstream of the intake branch ducts 102, in this embodiment, the number of the intake branch ducts 102 is two. The exhaust passage 2 includes an exhaust main passage 201 and at least two exhaust branch passages 202, the exhaust main passage 201 is communicated with the exhaust branch passages 202, specifically, an exhaust passage inlet 203 is arranged at the upstream of the exhaust main passage 201, the downstream of the exhaust main passage 201 is communicated with the upstream of the exhaust branch passages 202, an exhaust passage outlet 204 is arranged at the downstream of the exhaust branch passages 202, in this embodiment, the number of the exhaust branch passages 202 is two. In the present embodiment, the noise reduction structure is provided on the inner walls of the intake and

exhaust manifolds

101 and 201. The internal flow passages of the inlet 1 and outlet 2 channels are used for gas transport.

The inner walls of the inlet passage 1 and the exhaust passage 2 are formed with noise reduction structures corresponding to at least one noise frequency, the noise reduction structures can be uniformly formed along the circumferential direction of the inner walls of the inlet passage 1 and the exhaust passage 2, and can also be formed on a part of the inner walls of the inlet passage 1 and the exhaust passage 2, which is not limited by the utility model.

The noise reduction structure is provided with a plurality of resonance chambers 3 which are arranged at intervals, in the embodiment, the resonance chambers 3 are designed corresponding to various noise frequencies, the middle and high frequency range noise of 800-5000Hz can be eliminated, and the noise reduction effect is good.

As shown in fig. 2 and 3, the resonance chamber 3 is recessed inward from the inner walls of the inlet passage 1 and the outlet passage 2, and the resonance chamber 3 has an opening 301 only on the inner walls of the inlet passage 1 and the outlet passage 2, that is, the resonance chamber 3 is recessed inward from the inner walls of the inlet passage 1 and the outlet passage 2 and does not penetrate through the outer walls of the inlet passage 1 and the outlet passage 2, and the transmission of the flow passage gas inside the inlet passage 1 and the outlet passage 2 is not affected.

The resonance chamber 3 is a small helmholtz resonance cavity, and includes a first chamber 302 and a second chamber 303 which are communicated with each other, the first chamber 302 is further communicated with the internal flow channels of the intake duct 1 and the exhaust duct 2, and specifically, the first chamber 302 is communicated with the internal flow channels of the intake duct 1 and the exhaust duct 2 through the opening 301. In this embodiment, the first chamber 302 and the second chamber 303 are both cylindrical chambers, specifically cylindrical chambers, and the shape of the cylindrical chambers facilitates processing and forming. The shape of the opening 301 may be circular, oval, rectangular, etc., and also for convenience of machining, the shape of the opening 301 is circular in this embodiment.

Volume V of the second chamber 303₂Greater than the volume V of the first chamber 302₁Most preferably, the volume V of the second chamber 303₂Is much larger than the volume V of the first chamber 302₁. Generally, the volume ratio (V) of the second chamber 303 to the first chamber 302₂/V₁) Greater than or equal to 10, the volume ratio (V) of the second chamber 303 to the first chamber 302 in this embodiment is sufficient₂/V₁) Is 12.

Volume V of the first chamber 302₁And volume V of second chamber 303₂The natural frequency (ω), or also called the muffling frequency, of the resonance chamber 3, i.e. the corresponding noise reduction frequency, is determined together, and the formula of the natural frequency (ω) is:

where ω is the natural frequency of the resonance chamber 3, c is the sound velocity, S is the cross-sectional area of the opening 303, and L is the depth of the first chamber 302.

It can be seen from the above formula that the natural frequency ω of the resonance chamber is related to the cross-sectional area S of the opening and the depth L of the first chamber, that is, the natural frequency of the resonance chamber can be changed by changing the size of the cross-sectional area S of the opening and/or the depth L of the first chamber.

The working principle of the resonance chamber is as follows: when the frequency of the incident sound wave (noise frequency) is consistent with the natural frequency of the incident sound wave, air in the cavity of the resonance chamber can generate violent resonance, so that the air and the wall surface in the cavity are rubbed to generate heat energy, the conversion from sound energy to heat energy is realized, and the effects of sound absorption and noise reduction are achieved.

In this embodiment, the noise reduction frequencies corresponding to the resonance chambers 3 are different, so that the noise reduction structure can correspond to more noise frequencies, and is suitable for noise reduction of wide-band noise.

This embodiment still provides an engine, including the air flue of making an uproar that falls of organism and this embodiment, fall the air flue of making an uproar and set up in the organism, can directly fall the noise of engine inside and make an uproar, the noise reduction effect is good. In order to facilitate the structure setting, in this embodiment, the noise reduction air passage is a cylinder cover air passage of the engine, that is, the air passage 1 is a cylinder cover air passage, the air passage 2 is a cylinder cover air passage, the cylinder cover air passage of the engine is a metal air passage, and the noise reduction structure is easy to machine and form on the inner wall of the cylinder cover air passage, and is more stable and reliable.

In an engine body, an air inlet main passage 101 of an air inlet passage 1 is connected with an external air inlet manifold through an air inlet passage inlet 103, an air inlet branch passage 102 of the air inlet passage 1 is connected with a cylinder through an air inlet passage outlet 104, an exhaust main passage 201 of an exhaust passage 2 is connected with the cylinder through an exhaust passage inlet 203, and an exhaust branch passage 202 of the exhaust passage 2 is connected with an external exhaust manifold through an exhaust passage outlet 204. The connection mode between the inlet 103 and the external inlet manifold, the connection mode between the outlet 104 and the cylinder, the connection mode between the inlet 203 and the cylinder, and the connection mode between the outlet 204 and the external exhaust manifold are the same as those in the prior art, and are not described herein.

The following describes the noise reduction process of the engine in operation according to the embodiment:

in the intake stroke of the engine, an intake valve of an engine cylinder is opened, noise is transmitted to an inlet 103 of an air inlet from an outlet 104 of the air inlet (opposite to the transmission direction of gas in an internal flow passage of the air inlet), and the noise passes through a plurality of resonance chambers 3 on the way, and is reduced by silencing of the resonance chambers;

in the exhaust stroke of the engine, the exhaust valve of the engine cylinder is opened, noise is transmitted to the exhaust passage inlet 203 from the exhaust passage outlet 204 (the transmission direction of the noise is opposite to that of gas in the flow passage in the exhaust passage), and the noise passes through the plurality of resonance chambers 3 in the process, so that the effect of reducing the exhaust noise is achieved through the silencing of the resonance chambers.

This embodiment still provides an operation machinery, including the engine that automobile body and this embodiment provided, this engine sets up in the automobile body, because to the structure of making an uproar of falling of engine set up on the inside cylinder cap air flue of engine, fall the structure of making an uproar and can not occupy the interior space of arranging of car, should fall the whole car noise that air flue ability greatly reduced operation machinery in addition, effectively improve the travelling comfort of whole car.

In other embodiments, according to actual use requirements, the noise reduction frequencies corresponding to one part of the resonance chambers 3 are set to be different, and the noise reduction frequencies corresponding to the other part of the resonance chambers 3 are the same, as long as the requirements of the noise reduction frequency band can be met.

In other embodiments, the noise reduction structure may be disposed only on the intake duct 1 or the exhaust duct 2, or may be disposed on the inner walls of the intake main duct 101 and the intake branch duct 102, or disposed only on the inner wall of the intake branch duct 102, and similarly, the noise reduction structure may be disposed on the inner walls of the exhaust main duct 201 and the exhaust branch duct 202, or disposed only on the inner wall of the exhaust branch duct 202.

In other embodiments, the depth of the resonance chamber may be greater than the conventional thickness of the side wall of the intake duct or the exhaust duct, the conventional thickness refers to the thickness of the side wall of the intake duct where the resonance chamber is not disposed, and the outer wall of the intake duct where the resonance chamber is disposed may form a protrusion, thereby satisfying the requirement of the depth of the resonance chamber, but the resonance chamber still has only one opening at the inner wall.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A noise reducing airway characterized by: the noise reduction structure comprises an air inlet channel (1) and/or an air outlet channel (2), wherein noise reduction structures corresponding to at least one noise frequency are formed inside the inner walls of the air inlet channel (1) and the air outlet channel (2); the structure of making an uproar falls is sympathetic response room (3) that a plurality of interval set up, sympathetic response room (3) certainly intake duct (1) exhaust passage (2) the inside recess of inner wall, sympathetic response room (3) are only in intake duct (1) exhaust passage (2) the inner wall has opening (301).

2. The noise reducing airway of claim 1 wherein: the resonance chamber (3) comprises a first chamber (302) and a second chamber (303) which are communicated with each other, the first chamber (302) is also communicated with the internal flow passages of the inlet passage (1) and the outlet passage (2), and the volume of the second chamber (303) is larger than that of the first chamber (302).

3. The noise reducing airway of claim 2 wherein: the volume ratio of the second chamber (303) to the first chamber (302) is greater than or equal to 10.

4. The noise reducing airway of claim 2 wherein: the first chamber (302) and the second chamber (303) are both cylindrical chambers.

5. The noise reducing airway as in any of claims 2-4 wherein: the noise reduction frequencies corresponding to the resonance chambers (3) are different, or the noise reduction frequencies corresponding to one part of the resonance chambers (3) are different, and the noise reduction frequencies corresponding to the other part of the resonance chambers (3) are the same.

6. The noise reducing airway of claim 1 wherein:

the air inlet channel (1) comprises an air inlet main channel (101) and at least two air inlet branch channels (102), the air inlet main channel (101) is communicated with the air inlet branch channels (102), and the noise reduction structure is arranged on the inner wall of the air inlet main channel (101) and/or the air inlet branch channels (102);

the exhaust passage (2) comprises an exhaust main passage (201) and at least two exhaust branch passages (202), the exhaust main passage (201) is communicated with the exhaust branch passages (202), and the inner walls of the exhaust main passage (201) and/or the exhaust branch passages (202) are provided with the noise reduction structures.

7. An engine, characterized in that: comprising a body and a noise reducing air duct according to any of claims 1-6, said noise reducing air duct being arranged in said body.

8. The engine of claim 7, wherein: the noise reduction air passage is a cylinder cover air passage of the engine.

9. A working machine characterized in that: comprising a vehicle body and an engine according to claim 7 or 8, said engine being arranged in said vehicle body.