CN202628327U

CN202628327U - Air inlet tube for air filter

Info

Publication number: CN202628327U
Application number: CN 201220029380
Authority: CN
Inventors: 涂遇双; 邹龙; 徐宁; 陈蓉
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2012-01-30
Filing date: 2012-01-30
Publication date: 2012-12-26
Anticipated expiration: 2022-01-30

Abstract

The utility model discloses an air inlet tube for an air filter. One end of a hard tube (1a) is connected with a composite braided tube (1b); the composite braided tube (1b) is communicated with the hard tube (1a); a wavelength tube (3) which is communicated with the hard tube (1a) is fixedly arranged on the hard tube (1a); the outer end of the wavelength tube (3) is closed; the length of the wavelength tube (3) is one quarter of the wavelength of a sound wave propagated in air; a resonant cavity (4) which is integrated with the hard tube (1a) is connected with the hard tube (1a); and the volume of the resonant cavity (4) is 1-3L. The air inlet tube for the air filter consists of the hard tube and the composite braided tube, and the wavelength tube and the resonant cavity are additionally arranged on the hard tube, so that the acoustic energy loss when the sound wave passes through the air inlet tube is increased; and therefore, the air inlet noise of an engine is effectively reduced. The utility model has the characteristics that the air inlet tube for the air filter is ingenious in design, simple in structure, easy to transform, low in improvement cost and the like.

Description

Empty filter suction tude

Technical field

The utility model belongs to sky filter technical field, specifically, and the particularly suction tude of the empty filter of motor car engine.

Background technique

Along with The development in society and economy, people's living standard is greatly improved, and people's the level of consumption also improves gradually.Automobile is as a kind of main traffic tool, and is universal just day by day in people's life.Along with the fierceness day by day of automobile market competition, the noise control level that improves vehicle has become new focus of the competition and technological development direction, and the generation of car noise is mainly derived from motor.Because the achievement of engine exhaust noise reduction aspect is comparatively outstanding in recent years, so inflow noise has become one of main noise source of motor.The inflow noise of motor car engine increases along with the rising of engine speed, and behind the automotive ignition, air can get into empty filter via empty filter suction tude, filters the back through empty filter again and gets into engine air inlet tube, gets into the engine chamber burning at last.Traditional empty filter suction tude is made up of a hard tube, and relevant noise reduction parts are not set, and air has produced bigger noise when getting into the sky filter in a large number, has therefore increased the car load noise.

The model utility content

The utility model technical problem to be solved is to provide a kind of empty filter suction tude that can effectively reduce inflow noise.

The technological scheme of the utility model is following: a kind of empty filter suction tude, comprise body (1), and said body (1) is formed by hard tube (1a) and composite braided pipe (1b) butt joint.

The utility model adopts the combination of composite braided pipe and hard tube; Replace traditional fully hard pipe body; Composite braided pipe can play the effect that transition is flexible coupling, the vibration of transmitting with absorption portion motor and concavo-convex road surface, thus guarantee the stability of empty filter air inlet pipeline.Simultaneously, after air gets into empty filter suction tude, need to get into empty filter through composite braided pipe; When sound wave imported into to composite braided pipe internal surface, an acoustic energy part was reflected, and a part penetrates composite braided pipe; Because composite braided pipe inside has a large amount of micro-pores or cavity, when acoustic energy passes through these micro-pores or cavity, cause the air molecule vibration in micro-pore or the cavity; Air molecule is the material molecule of the composite braided pipe of bump constantly, ability or heat energy in part acoustic energy is converted to, and acoustic energy is depleted; Be that usually said sound is absorbed, thereby greatly reduce inflow noise.

Be provided with resonant cavity (4) on the next door of said hard tube (1a), this resonant cavity (4) is near the suction port of hard tube (1a), and resonant cavity (4) communicates with hard tube (1a) through connecting tube (5).After sound wave got into resonant cavity, the air under the effect of sound wave in the resonant cavity just produced vibration, and the frictional damping during vibration makes wherein a part of acoustic energy convert thermal dissipation into to fall; When the resonant cavity natural frequency is identical with frequency of sound wave, just produce resonance, the vibration velocity of air reaches maximum value; The acoustic energy that consume this moment is maximum; Sound deadening capacity is maximum, thereby has reduced by empty filter suction tude to extraradial acoustic energy, reaches the noise elimination purpose.

The volume of said resonant cavity (4) is 1-3L, and the volume of resonant cavity is too small, can influence the vibration frequency of air, and then reduces the noise elimination effect of resonant cavity; The volume of resonant cavity is excessive, need occupy too large space, causes the inconvenience of installation.Therefore, the volume of resonant cavity with above-mentioned be of a size of suitable, the convenience that can take into account the noise elimination effect and install with resonant cavity.Simultaneously, for simplified processing process, reduce production costs, said resonant cavity (4), connecting tube (5) and hard tube (1a) are structure as a whole.

On said hard tube (1a), be installed with wavelength pipe (3), the outer end sealing of said wavelength pipe (3), the inner of wavelength pipe (3) communicates with hard tube (1a).The length of wavelength pipe (3) is that sound wave is at 1/4th of air medium wavelength; After sound wave got into the wavelength pipe from hard tube, because the sealing of wavelength pipe outer end, sound wave can reflect back into hard tube after entering at the bottom of the wavelength pipe pipe; Be radiated outside then; Again because the length of wavelength pipe is sound wave when in air, propagating 1/4th of wavelength, the frequency of sound wave when getting into the inner mouth of pipe of wavelength pipe, with the frequency of managing the sound wave that the end reflects from the outer end just in time be that crest and trough are superimposed; Thereby cut out the sound wave of this frequency, thereby can further reduce the car load noise.

Beneficial effect: the utility model adopts hard tube and composite braided pipe to form empty filter suction tude; And on hard tube, set up wavelength pipe resonant cavity; Increased the acoustic energy loss of sound wave the time like this through suction tude; Thereby effectively reduce the inflow noise of motor, have characteristics such as design is ingenious, simple in structure, transformation is easy, reforming cost is low.

Description of drawings

Fig. 1 is the stereogram of the utility model.

Fig. 2 is the utility model and the schematic representation that is connected of empty filter.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Like Fig. 1, shown in Figure 2; The suction tude of automotive muffler has body 1; This body 1 is made up of hard tube 1a and composite braided pipe 1b, and the outlet end of hard tube 1a links to each other with the entrance point butt joint of composite braided pipe 1b, and the suction port of the outlet end of composite braided pipe 1b and empty filter 6 links together.The shape of said body 1 is identical with existing technology, and can change according to actual needs, does not do at this and gives unnecessary details.Be provided with resonant cavity 4 on the next door of said hard tube 1a, this resonant cavity 4 is near the suction port of hard tube 1a, and resonant cavity 4 communicates with hard tube 1a through connecting tube 5, and resonant cavity 4, connecting tube 5 and hard tube 1a are structure as a whole.The volume of said resonant cavity 4 is 1-3L, and in the present embodiment, the volume of resonant cavity 4 is preferably 1L.

From Fig. 1, can know, on hard tube 1a, be fixed with wavelength pipe 3, this wavelength pipe 3 is between the suction port and connecting tube 5 of hard tube 1a.The sealing of the outer end of wavelength pipe 3, wavelength pipe 3 inner uncovered and communicate with hard tube 1a, the length of said wavelength pipe 3 be sound wave at 1/4th of air medium wavelength, in the present embodiment, the length of wavelength pipe 3 is preferably 287mm.

The working principle of the utility model is following:

After air gets into empty filter suction tude, get in the wavelength pipe 3 earlier from hard tube 1a, the frequency of sound wave when getting into the inner mouth of pipe of wavelength pipe 3, with the frequency of the sound wave that the pipe end reflects from the outer end be that crest and trough are superimposed, thereby cut out the sound wave of this frequency; Sound wave gets in the resonant cavity 4 then, and under the effect of sound wave, the air in the resonant cavity 4 produces with sound waves and resonates, and the frictional damping during resonance makes wherein a part of acoustic energy convert thermal dissipation into to fall; Sound wave is last through composite braided pipe 1b; When sound wave imports into to composite braided pipe 1b internal surface; An acoustic energy part is reflected, and a part is passed composite braided pipe 1b, causes micro-pore or the vibration of the air molecule in the cavity that composite braided pipe 1b is inner; Air molecule is the material molecule of the composite braided pipe 1b of bump constantly, and ability or heat energy loss fell in part acoustic energy was converted to.

The above is merely the preferred embodiment of the utility model, is not restriction with the utility model, any modification of being done within all spirit and principles at the utility model, is equal to replacement and improves, and all should be included within the protection domain of the utility model.

Claims

1. an empty filter suction tude comprises body (1), it is characterized in that: said body (1) is formed by hard tube (1a) and composite braided pipe (1b) butt joint.

2. empty filter suction tude according to claim 1; It is characterized in that: be provided with resonant cavity (4) on the next door of said hard tube (1a); This resonant cavity (4) is near the suction port of hard tube (1a), and resonant cavity (4) communicates with hard tube (1a) through connecting tube (5).

3. empty filter suction tude according to claim 2 is characterized in that: the volume of said resonant cavity (4) is 1-3L, and this resonant cavity (4), connecting tube (5) and hard tube (1a) are structure as a whole.

4. empty filter suction tude according to claim 3 is characterized in that: on said hard tube (1a), be installed with wavelength pipe (3), and the outer end sealing of said wavelength pipe (3), the inner of wavelength pipe (3) communicates with hard tube (1a).