CN209510490U - A kind of air inlet transfer box with decrease of noise functions - Google Patents

Abstract

The utility model provides a kind of air inlet transfer box with decrease of noise functions, is related to air filter machine inlet air auxiliary structure technical field, including cabinet, is fixed on the intracorporal water fender of the case；The cabinet includes the front panel for being sequentially connected and surrounding hollow box body, rear panel, left panel, right panel, and the top plate and bottom plate of closing hollow box body；The bottom plate offers apopore；The front panel is equipped with air inlet, and the rear panel is equipped with gas outlet, and the junction of the left panel and the rear panel is equipped with arc-shaped transition plate.The air inlet transfer box of the application, the rational design to size, thickness, weight, and increase arc-shaped transition plate, while guaranteeing rigidity, light-weight design is carried out to air inlet transfer box.The harmonic frequency for avoiding engine reduces covibration, reduces vehicle inflow noise, improves occupant comfort sense.

Description

A kind of air inlet transfer box with decrease of noise functions

Technical field

The utility model relates to air filter machine inlet air auxiliary structure technical fields, have noise reduction function in particular to one kind The air inlet transfer box of energy.

Background technique

NVH is the english abbreviation of noise, vibration and sound vibration roughness (Noise, Vibration, Harshness).This is Global question of automobile manufacture quality is measured, it is experienced as most directly and most surface to user vehicle.Vehicle One of the problem of NVH problem is the major vehicle manufacturing enterprise of international automobile industry and parts enterprises concern.There is statistics to show, Vehicle is to have relationship with the NVH problem of vehicle, and there is nearly 20% R & D Cost consumption in each major company there are about 1/3 failure problems On the NVH for solving the problems, such as vehicle.

Air inlet switching device is mainly used for connecting air intake duct and air filter, for providing power, switching device for engine Generally in the body structure of straight tube, body structure is simple, is common rectangular box body.And existing air inlet switching device is generally deposited It even will appear sound of obviously beating a drum in air inlet under inflow noise problems of too, serious conditions.It is practical new according to this problem Type people develops the air inlet transfer box of a high-end vehicle, and carries out Modal Analysis analysis to air inlet transfer box threedimensional model.

Utility model content

The utility model discloses a kind of air inlet transfer box with decrease of noise functions, it is intended to improve the noise of air inlet transfer box Big problem.

The utility model uses following scheme:

A kind of air inlet transfer box with decrease of noise functions, including cabinet, it is fixed on the intracorporal water fender of the case；The case Body includes the front panel for being sequentially connected and surrounding hollow box body, rear panel, left panel, right panel, and closes hollow box body Top plate and bottom plate；The bottom plate offers apopore；The front panel is equipped with air inlet, and the rear panel is equipped with gas outlet, and The junction of the left panel and the rear panel is equipped with arc-shaped transition plate.

As a further improvement, the thickness of each panel of the cabinet is 1-2mm, the weight of air inlet transfer box is 4.5-12.0kg。

As a further improvement, the rounded shape in section of the arc-shaped transition plate, radius of corner 80-100mm.

As a further improvement, the distance between the left panel and right panel are 360-380mm.

As a further improvement, the thickness of each panel of the cabinet is 1.5mm, the weight of air inlet transfer box is 8.31kg。

As a further improvement, the frequency of the first mode of the air inlet transfer box is 93.5Hz, the frequency of second mode For 120.8Hz, the frequency of third mode is 134.1Hz；And rigidity is 72648.1N/mm.

As a further improvement, the material of the air inlet transfer box is galvanized sheet.

As a further improvement, the water fender is fixed on the inner wall of the top plate, and from the front panel to after described The inclination of panel direction.

As a further improvement, the gas outlet is equipped with cylindrical escape pipe, the escape pipe is obliquely installed in described The intermediate region of rear panel.

As a further improvement, the right panel is equipped with first step portion, the both sides in the first step portion extend to institute State top plate and the bottom plate；The front panel is equipped with second step portion, and the both sides in the second step portion extend to the left side Plate and the first step portion.

By using above-mentioned technical proposal, the utility model can obtain following technical effect:

The air inlet transfer box of the application, the rational design to size, thickness, weight, and increase arc-shaped transition plate, guarantee rigid While spending, light-weight design is carried out to air inlet transfer box.The harmonic frequency for avoiding engine reduces covibration, drop Low vehicle inflow noise improves occupant comfort sense.

Further, by the optimal size and thickness of preferred air inlet transfer box, obtain frequency under each mode with The biggish product of engine harmonic frequency difference effectively can avoid frequency from being close and lead to the generation of covibration, reduce The noise of air inlet transfer box.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the air inlet transfer box of the utility model embodiment；

Fig. 2 is the top view of the air inlet transfer box in Fig. 1；

Fig. 3 is structural schematic diagram of the air inlet transfer box of the utility model embodiment under another visual angle；

Fig. 4 is the structural schematic diagram of the air inlet transfer box of comparative example 1；

Fig. 5 is the structural schematic diagram of the air inlet transfer box of comparative example 2；

Fig. 6 is the displacement cloud atlas in the utility model embodiment 2 under first step mode；

Fig. 7 is the displacement cloud atlas in the utility model embodiment 2 under second-order mode；

Fig. 8 is the displacement cloud atlas in the utility model embodiment 2 under third rank mode.

Icon: 1- cabinet；11- front panel；12- rear panel；13- left panel；14- right panel；15- top plate；16- bottom plate； 2- water fender；3- apopore；4- air inlet；The gas outlet 5-；6- arc-shaped transition plate；7- first step portion；8- second step portion.

Specific embodiment

It is practical below in conjunction with this to keep the purposes, technical schemes and advantages of the utility model embodiment clearer The technical solution in the utility model embodiment is clearly and completely described in attached drawing in novel embodiment, shows So, described embodiment is a part of embodiment of the utility model, rather than whole embodiments.It is practical based on this Embodiment in novel, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment is fallen within the protection scope of the utility model.Therefore, the implementation to the utility model provided in the accompanying drawings below The detailed description of mode is not intended to limit the range of claimed invention, but is merely representative of the utility model Selected embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative labor Every other embodiment obtained under the premise of dynamic, fall within the protection scope of the utility model.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise " be based on the orientation or positional relationship shown in the drawings, be only for Convenient for description the utility model and simplify description, rather than the equipment of indication or suggestion meaning or element must have specifically Orientation is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.The meaning of " plurality " is two or two in the description of the present invention, More than, unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis Concrete condition understands the concrete meaning of above-mentioned term in the present invention.

In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it "lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above " One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only Indicate that first feature horizontal height is less than second feature.

Embodiment 1

In conjunction with Fig. 1-3, a kind of air inlet transfer box with decrease of noise functions is present embodiments provided, including cabinet 1, be fixed on The intracorporal water fender 2 of case.Cabinet 1 includes being sequentially connected and enclosing the front panel 11 of hollow box body, rear panel 12, left panel 13, right panel 14, and the top plate 15 and bottom plate 16 of closing hollow box body.Bottom plate 13 offers apopore 3, is used for cabinet 1 Interior ponding discharge.

Further, front panel 11 is equipped with air inlet 4, and rear panel is equipped with gas outlet 5, and the connection of left panel and rear panel Place is equipped with arc-shaped transition plate 6.And the rounded shape in section of arc-shaped transition plate 6, radius of corner 80-100mm.Left panel 13 and the right side The distance between panel 14 is 360-380mm.Preferably, in the present embodiment, radius of corner is set as 100mm, at this time left panel 13 The distance between right panel 14 is 380mm.The thickness of each panel of cabinet 1 is 1-2mm, and the weight of air inlet transfer box is 4.5-12.0kg。

More specifically, the air inlet section of air inlet 4 accounts for the 60%-80% of 11 gross area of front panel, the outlet of gas outlet 5 Section accounts for the 40%-60% of 12 gross area of rear panel.It should be noted that the gross area be comprising air inlet/gas outlet including The gross area.Air inlet 4 and the gas outlet 5 of suitable size are set, on the one hand can satisfy and provide enough air for engine, separately The intracorporal gas delivered volume of unit time case can be adjusted on one side, and gas delivered volume is excessive, then is easy to produce excessive make an uproar Sound, and gas delivered volume is too small, then is unable to satisfy gas supply demand.

Further, the material of air inlet transfer box is galvanized sheet, and galvanized sheet is to prevent surface of steel plate from being corroded, in steel Plate surface is coated with one layer of metallic zinc, prolongs its service life.Water fender 2 is fixed on the inner wall of top plate 15, and from front panel 11 to The inclination of 12 direction of rear panel, inclined direction is precisely air inlet 4 toward 5 direction of gas outlet, and ensure that can block into cabinet 1 Steam etc..Preferably, the tilt angle of water fender 2 is 25 ° -30 °.It is further preferable that the edge of water fender 2 is apart from bottom plate Distance be 180-200mm.The setting of water fender 2 is excessive, then will lead to excessive retardation gases conveying, cabinet is caused to be easy to happen Vibration, it is easier to resonance is generated with engine, and water fender 2 is arranged too small, then can not play good water blocking effect.

Further, gas outlet 5 is equipped with cylindrical escape pipe, and escape pipe is obliquely installed 12 intermediate region of plate later, And escape pipe is connected to engine by air filter.Escape pipe is tilted towards 16 direction of bottom plate, and inclined direction and horizontal plane it Between angle be 20 ° -25 °.Escape pipe, which is set to intermediate region, can preferably be connected to air inlet, so that gas is more convenient effective Into gas outlet 5.

Further, right panel is equipped with first step portion 7, and the both sides in first step portion 7 extend to top plate 15 and bottom plate 16. Front panel 11 is equipped with second step portion 8, and the both sides in second step portion 8 extend to left panel 13 and first step portion 7.By setting up First step portion 7 and second step portion 8, facilitate and air inlet transfer box be stably mounted on the vehicle body of car.And first step The height in portion is 120mm, and the height in second step portion is 80mm.The setting of stage portion is so that the cavity inside cabinet 1 is in certain Rule variation, cavity area become larger from air inlet 4 to gas outlet 5.Since first step portion 7 and second step portion 8 are all provided with Close to 4 side of air inlet, so that the air inlet cavity at air inlet 5 is smaller, after separate stage portion, cavity area becomes larger. So that enter gas slowly entered by smaller volume, arrive large volume when accelerate enter, ensure that when gas enters cabinet 1 by Slow-to-fast and then slowly varying effectively reduces 1 air inlet of cabinet and the noise that generates.

In the present embodiment 1, it is preferred that the radius of corner of the cabinet 1 of air inlet transfer box is set as 100mm, at this time left panel 13 The distance between right panel 14 is 380mm.In the present embodiment, all panels of cabinet 1 with a thickness of 1mm, air inlet at this time turns The total weight for connecing case is 5.57kg, rigidity 21897.3N/mm.

Embodiment 2

It is only that in place of the structure of air inlet transfer box provided in this embodiment and the difference of embodiment 1, all faces of cabinet 1 Plate with a thickness of 1.5mm, the total weight of air inlet transfer box is 8.31kg, rigidity 72648.1N/mm at this time.

Embodiment 3

It is only that in place of the structure of air inlet transfer box provided in this embodiment and the difference of embodiment 1, all faces of cabinet 1 Plate with a thickness of 2mm.The total weight of air inlet transfer box is 11.05kg, rigidity 170179N/mm at this time.

Comparative example 1

Referring to Fig. 4, this comparative example provides a kind of air inlet transfer box, it is only that with the difference place of embodiment 1, the left side The distance between plate 13 and right panel 14 are 280mm, and left panel and rear panel are directly connected to, and there is no the arcs in embodiment 1 Shape transition plates and first step portion.The total weight of cabinet is 4.56kg, rigidity 6175.3N/mm at this time.

Comparative example 2

Referring to Fig. 5, this comparative example provides a kind of air inlet transfer box, it is only that with the difference place of embodiment 1, the left side The distance between plate 13 and right panel 14 are still 380mm, but left panel 13 and rear panel 12 are directly connected to, and embodiment 1 is not present In without arc-shaped transition plate 6.The total weight of cabinet is 5.72kg, rigidity 19175.8N/mm at this time.

Modal Analysis analysis

Mould has been carried out using the air inlet transfer box that HyperWorks software provides embodiment 1, comparative example 1 and comparative example 2 State simulation analysis, the results are shown in Table 1-1.

Modal frequency of the table 1-1 air inlet transfer box under identical wall thickness, different sizes, weight

It is low that the low transfer box of rigidity value represents transfer box intensity.It should be noted that first-order modal is the excitation frequency of external force Rate occurs when equal with natural frequency of object, and the vibration shape of object is called a first order mode or principal mode at this time.Second order Mode, which is the driving frequency of external force, to be occurred when be twice of natural frequency of object (second-order), at this time the vibration shape of object It is called second_mode.Three rank mode, which are the driving frequencies of external force, to be occurred when be natural frequency of object (third rank) three times, The vibration shape of object is called three first order modes at this time.

More specifically, engine charge noise is mainly that the pressure fluctuations for being periodically opened and closed by inlet valve and being generated cause , its main frequency is influenced by engine speed, and calculation formula is as follows:

Wherein n is engine revolution, and i is engine cylinder number, and τ is number of stroke.The following are the engine parameters of car:

And then it analyzes and can obtain:

The first-order modal (36.8Hz) of comparative example 1 is closer to the first harmonic frequency (27.5Hz) of engine.Because The energy of first harmonic is maximum in all harmonic waves, so the two numerical value is close, easily causes transfer box and engine occurs Resonance generates inflow noise.And 1 rigidity value of scheme is relatively low, and the low transfer box of rigidity value is due to intensity in vehicle driving process It is low to be shaken together with vehicle body.

Three rank mode (83.4Hz) and the engine third harmonic frequencies (82.5Hz) of comparative example 2 are closer to.Although three The energy of the energy ratio first harmonic of subharmonic is much smaller but still can not ignore, also can be a little so the two numerical value is close Cause transfer box to resonate with engine, generates inflow noise.

All mode of embodiment 1 are mutually avoided with the harmonic frequency of engine, and rigidity value is maximum.Therefore it is preferably implemented The air inlet transfer box of example 1 is the air inlet transfer box of this Design vehicle.Rational design of the embodiment 1 to size, thickness, weight, And increase arc-shaped transition plate, while guaranteeing rigidity, and light-weight design.The harmonic frequency of engine is avoided, it is existing to reduce resonance As occurring, vehicle inflow noise is reduced, occupant comfort sense is improved.

Further, mode has been carried out to the air inlet transfer box that embodiment 1-3 is provided using HyperWorks software to imitate True analysis, the results are shown in Table 1-2.

Modal frequency of the table 1-2 air inlet transfer box under identical size, different wall thickness, weight

According to upper table analysis it can be concluded that in embodiment 2 and embodiment 3, the air inlet of wall thickness 1.5mm, wall thickness 2mm is selected to turn All mode for connecing case can avoid each order harmonic frequency of engine.The air inlet transfer box of certain wall thickness 1.5mm compares wall thickness The transfer box weight of 2.0mm is lighter, and according to the requirement preferred embodiment 2 of body lightening, the transfer box that wall thickness is 1.5mm is tool There is the air inlet transfer box of optimal effectiveness.

The above analysis, in preferred embodiment 2, the radius of corner of the cabinet 1 of air inlet transfer box is 100mm, top plate and The left and right directions length of bottom plate is 380mm, and thickness is set as 1.5mm, and the total weight of cabinet is 8.31kg at this time, and rigidity is 72648.1N/mm.At this point, the frequency of the first mode of air inlet transfer box is 93.5Hz, the frequency of second mode is 120.8Hz, The frequency of third mode is 134.1Hz, avoids each order harmonic frequency of engine completely, avoids frequency from being close and cause to resonate The generation of phenomenon.

Please refer to Fig. 4-Fig. 6, the respectively displacement under the first step mode of embodiment 2, second-order mode, third rank mode Cloud atlas.By the vibration modal analysis to mode, displacement amplitude of the present embodiment 2 under each rank mode is as shown in the figure.It can obviously see Out, the maximum amplitude point in the displacement cloud atlas under the first step mode in Fig. 6 concentrates on water fender, remaining place is not obvious Offset phenomena.Because the frequency (93.5Hz) of first step mode is 3.4 times of left sides of engine first harmonic frequency (27.5Hz) The right side is much avoided, and covibration is nearly free from.The maximum amplitude point set in displacement cloud atlas under second-order mode in Fig. 7 In on top plate and bottom plate, remaining place is without apparent offset phenomena.Second-order modal frequency (120.8Hz) is to start at this time 2.2 times or so of machine second harmonic frequency (55Hz) still can avoid the generation of covibration.Under third rank mode in Fig. 8 Maximum amplitude point in displacement cloud atlas concentrates on left panel, right panel and bottom plate, remaining place is existing without significantly displacement As.Third rank modal frequency (134.1Hz) is 1.6 times or so of engine secondary harmonic frequency (82.5Hz) at this time, because three The energy of subharmonic is the smallest in all harmonic waves, though it still can avoid covibration so the two numerical value multiplying power difference is smaller It generates.

Further, the air inlet transfer box of embodiment 2 and comparative example 1 is mounted on car, carries out noise test.Test It as a result is that the noise that comparative example 1 generates is 87.1 decibels, and the noise that embodiment 2 generates is 84.1 decibels.It can by test result , in implementation column 2, the radius of corner of the cabinet 1 of air inlet transfer box is set as 100mm, at this time between left panel 13 and right panel 14 Distance be 380mm, all panels of cabinet 1 with a thickness of 1.5mm, the total weight of air inlet transfer box is 8.31kg at this time, just Degree is 72648.1N/mm.Embodiment 2 is the most reasonable to the design of size, thickness, weight, avoids the harmonic frequency of engine, Covibration is reduced, inflow noise can be reduced up to 3 decibels.

Above are merely preferred embodiments of the utility model, the protection scope of the utility model is not limited merely to above-mentioned Embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.

Claims (10)

1. a kind of air inlet transfer box with decrease of noise functions, which is characterized in that including cabinet, be fixed on the intracorporal water blocking of the case Plate；The cabinet includes in the front panel for being sequentially connected and surrounding hollow box body, rear panel, left panel, right panel, and closing The top plate and bottom plate of empty van body；The bottom plate offers apopore；The front panel is equipped with air inlet, and the rear panel is equipped with Port, and the junction of the left panel and the rear panel is equipped with arc-shaped transition plate.

2. air inlet transfer box according to claim 1, which is characterized in that the thickness of each panel of the cabinet is 1- 2mm, the weight of air inlet transfer box are 4.5-12.0kg.

3. air inlet transfer box according to claim 1, which is characterized in that the rounded shape in section of the arc-shaped transition plate, Radius of corner is 80-100mm.

4. air inlet transfer box according to claim 1, which is characterized in that the distance between the left panel and right panel are 360-380mm。

5. air inlet transfer box according to claim 1, which is characterized in that the thickness of each panel of the cabinet is 1.5mm, the weight of air inlet transfer box are 8.31kg.

6. air inlet transfer box according to claim 1, which is characterized in that the frequency of the first mode of the air inlet transfer box For 93.5Hz, the frequency of second mode is 120.8Hz, and the frequency of third mode is 134.1Hz；And rigidity is 72648.1N/mm.

7. air inlet transfer box according to claim 1, which is characterized in that the material of the air inlet transfer box is galvanized sheet.

8. air inlet transfer box according to claim 1, which is characterized in that the water fender is fixed on the interior of the top plate Wall, and tilted from the front panel to the rear panel direction.

9. air inlet transfer box according to claim 1, which is characterized in that the gas outlet is equipped with cylindrical escape pipe, The escape pipe is obliquely installed in the intermediate region of the rear panel.

10. air inlet transfer box according to claim 1, which is characterized in that the right panel is equipped with first step portion, described The both sides in first step portion extend to the top plate and the bottom plate；The front panel be equipped with second step portion, described second The both sides in rank portion extend to the left panel and the first step portion.