CN115266106A

CN115266106A - A noise elimination test cabin for firewood electricity increases journey ware

Info

Publication number: CN115266106A
Application number: CN202210862530.1A
Authority: CN
Inventors: 马泽东; 王阳; 曾志远; 隗立国; 李欣; 刘建峰
Original assignee: China North Vehicle Research Institute
Current assignee: China North Vehicle Research Institute
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2022-11-01

Abstract

The invention provides a silencing test cabin for a diesel-electric range extender, which comprises a cabin body, a cabin door, an observation window, an air inlet channel and an air exhaust channel. The cabin body, the cabin door and the air inlet and exhaust channel are structurally designed by adopting a plurality of layers of sound absorption materials, and different sound absorption materials are arranged, so that the sound absorption effect on multi-frequency noise of the diesel-electric range extender is good; the exhaust passage adopts a double-layer structure, the energy of exhaust heat flow is reduced by a plurality of corners, and the sound absorption plate with the transverse structure and the multilayer sound absorption device are designed along the way, so that the noise energy can be greatly reduced, and the aim of eliminating exhaust noise is fulfilled; the observation window department adopts shellproof glass, and the rotating member throws away the foreign matter and causes the injury to the testing personnel when can effectively preventing the firewood electricity from increasing journey ware to break down, adopts double glazing vacuum interlayer design, can effective separation noise propagation.

Description

A noise elimination test cabin for firewood electricity increases journey ware

Technical Field

The invention belongs to the technical field of vehicle engineering, and particularly relates to a silencing test cabin for a diesel-electric range extender.

Background

The military unmanned vehicle technology is developed rapidly in recent years, and when a task is executed, the use environment of the military unmanned vehicle is more severe than that of an unmanned vehicle, and the use working condition is more complex. Because the power compartment space is limited, the unmanned vehicle mostly adopts a hybrid power architecture, the battery technologies of the existing ternary lithium battery, lithium iron phosphate battery and the like are not perfect enough, the power battery is influenced by the factors of cycle service life, energy density, endurance mileage, safety and the like, the hybrid power military vehicle usually adopts a diesel-electric range extender scheme, namely, a diesel engine and a generator are connected together, the diesel engine is used as a driving machine, the generator is used as a driven machine, a thermal management system is integrated on the two sides of the diesel engine and the generator as far as possible, the whole system drives the generator to generate electricity through the diesel engine, the electricity is provided for power batteries, driving motors and other electric components, and continuous power is provided for the running of a chassis.

In order to improve the product development efficiency, shorten the project period and reduce the unnecessary external field test cost, all functions of the diesel-electric range extender need to be comprehensively verified in a laboratory, the equipment development period is shortened, and the fault rate of the external field test is reduced. In the test process, the diesel engine emits noise up to 95dB, so that testers are in extremely severe working environment, and if a unit fails, the testers can be damaged. Therefore, in consideration of requirements of safety, noise reduction and the like, the noise elimination cabin needs to be designed, the diesel-electric range extender is placed in the cabin to carry out various tests, the damage of noise to testers can be reduced, and the damage to the testers caused by the fact that foreign matters are thrown out due to the fact that the diesel-electric range extender breaks down and the like in the test process can be prevented.

Disclosure of Invention

Technical problem to be solved

The invention provides a silencing test cabin for a diesel-electric range extender, which aims to solve the technical problems of reducing test noise and improving test safety.

(II) technical scheme

In order to solve the technical problem, the invention provides a silencing test cabin for a diesel-electric range extender, which comprises a cabin body, a cabin door, an observation window, an air inlet channel and an air exhaust channel; wherein, a plurality of layers of sound absorption structures are arranged around the cabin body, and each layer of sound absorption structure has different sound absorption frequency bands; the cabin door is arranged on the cabin body and adopts a multilayer sound absorption structure the same as that of the cabin body; an observation window is arranged on the side of the cabin body; and the two sides of the top of the cabin body are respectively provided with an air inlet channel and an air outlet channel which are communicated with the interior of the cabin body, the air inlet channel is used for supplying fresh air to the diesel engine, and the air outlet channel is used for discharging heat flow of the heat management system of the diesel-electric range extender out of the cabin.

Further, the cabin body is of a steel frame structure.

Furthermore, the multilayer sound absorption structure comprises a metal sound absorption plate, a first sound absorption cotton, a second sound absorption cotton, a gas cavity and a structure sound absorption panel from outside to inside in sequence.

Further, the density of the first sound-absorbing cotton is greater than that of the second sound-absorbing cotton.

And further, sealing joints of the two cabin doors, joints of the cabin doors and the cabin body and joints of the cabin doors and the ground by sound insulation rubber strips.

Further, the observation window uses bulletproof glass and adopts a double-layer vacuum structure.

Furthermore, the air inlet channel and the air outlet channel are of steel frame structures, and multilayer sound absorption structures which are the same as the cabin body are arranged on the wall surfaces of the air inlet channel and the air outlet channel.

Furthermore, the air inlet channel is in an upper inlet and a lower outlet, a 90-degree corner is arranged at the bottom of the air channel after the air inlet channel enters the cabin body, and a porous sound insulation plate is transversely arranged in the air inlet channel.

Furthermore, the exhaust passage adopts a double-layer structure design, the inside of the exhaust passage comprises 4 right-angle turns, and a porous sound insulation plate is transversely arranged in the exhaust passage.

Furthermore, the silencing test chamber is also provided with a tail gas discharge pipeline which discharges the tail gas of the diesel engine to an exhaust passage through a high-temperature resistant hose.

(III) advantageous effects

The invention provides a silencing test cabin for a diesel-electric range extender, which comprises a cabin body, a cabin door, an observation window, an air inlet channel and an air exhaust channel. The cabin body, the cabin door and the air inlet and exhaust channel are structurally designed by adopting a plurality of layers of sound absorption materials, and different sound absorption materials are arranged, so that the sound absorption effect on multi-frequency noise of the diesel-electric range extender is good; the exhaust passage adopts a double-layer structure, the energy of exhaust heat flow is reduced by a plurality of corners, and the sound absorption plate with a transverse structure and the multilayer sound absorption device are designed along the way, so that the noise energy can be greatly reduced, and the aim of eliminating exhaust noise is fulfilled; the observation window department adopts shellproof glass, and the rotating member throws away the foreign matter and causes the injury to the testing personnel when can effectively preventing the firewood electricity from increasing journey ware to break down, adopts double glazing vacuum interlayer design, can effective separation noise propagation.

Drawings

FIG. 1 is a general schematic view (front view) of a silencing test chamber structure according to an embodiment of the invention;

FIG. 2 is a general schematic view (side view) of a silencing test chamber structure according to an embodiment of the invention;

FIG. 3 is a schematic view of a multilayer sound absorbing cross-sectional structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of an inlet structure according to an embodiment of the present invention;

FIG. 5 is a schematic view of an exhaust passage according to an embodiment of the present invention.

Detailed Description

In order to make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be made in conjunction with the accompanying drawings and examples.

The embodiment provides a silencing test cabin for a diesel-electric range extender, the overall structure of which is shown in fig. 1 and mainly comprises a cabin body 1, a cabin door 2, an observation window 3, an air inlet channel 4 and an air outlet channel 5.

The cabin body 1 is of a steel frame structure, the concrete structure is determined according to the field area of a test room and the volume of test equipment, multiple layers of sound absorption structures are arranged around the cabin body 1, the sound absorption frequency bands of the sound absorption structures are different, and different frequency noises emitted by a diesel engine, a generator and a heat management system can be comprehensively reduced. The multilayer sound absorption structure comprises a metal sound absorption plate 6, a first sound absorption cotton 7, a second sound absorption cotton 8, a gas cavity 9 and a structure sound absorption panel 10 from outside to inside in sequence, and can ensure effective separation of multi-band noise. Wherein, the metal material acoustic baffle 6 utilizes the inboard material to absorb sound, and structure sound absorption panel 10 utilizes and realizes the sound absorption performance through choosing different panel pass, hole density and aperture size, and the density of first sound absorption cotton 7 is greater than the second sound absorption cotton 8.

The cabin door 2 arranged on the cabin body 1 is used for the testers to enter the cabin to inspect equipment, the cabin door 2 adopts a multilayer sound absorption structure the same as the cabin body 1, and sealing treatment is carried out on joints of two doors, joints of the cabin door and the cabin body, and joints of the cabin door and the ground through sound insulation adhesive tapes so as to prevent noise from being transmitted. The size of the cabin door is related to the equipment to be tested, and the equipment can be ensured to smoothly enter the cabin for testing.

The side of the cabin body 1 is provided with an observation window 3, in order to prevent potential safety hazards caused by throwing out of test pieces and prevent noise transmission, the observation window 3 is made of bulletproof glass and adopts a double-layer vacuum structure, and the safety performance and the noise reduction performance are considered.

The two sides of the top of the cabin body 1 are respectively provided with an air inlet duct 4 and an air outlet duct 5 which are communicated with the interior of the cabin body. The air inlet channel 4 is used for supplying fresh air to the diesel engine, and the air outlet channel 5 is used for discharging heat flow of the heat management system of the diesel-electric range extender out of the diesel engine, so that the condition that the temperature in the diesel engine is too high to cause over-temperature protection of equipment and the power requirement required by a test cannot be met is prevented.

The air inlet passage 4 and the air outlet passage 5 are of steel frame structures, in order to prevent air flow noise in the air inlet and outlet processes, the air inlet passage 4 and the air outlet passage 5 are both provided with multilayer sound absorption structures which are the same as the cabin body 1 on the wall surface, and the arrangement mode of the porous sound insulation plate transverse air passages is adopted, so that the air flow energy can be effectively reduced, and the air flow uniformity can be improved.

The air inlet channel 4 adopts a top-in-bottom-out design, as shown in fig. 4, in the air passage flowing process of air flow, noise can be eliminated through a multilayer sound absorption structure on the wall surface of the air passage, and the air inlet channel 4 adopts a 90-degree corner design at the bottom of the air passage after entering the cabin body, so that the energy of the air flow can be reduced again.

Because the flow rate of the exhaust gas is large, the exhaust passage 5 adopts a double-layer structure design, and the gas passage comprises 4 right-angle turns, as shown in fig. 5, the gas energy is effectively reduced by increasing the flow distance of the exhaust gas which needs to pass through the gas passage. Meanwhile, the exhaust passage 5 is also designed to be transversely arranged by a sound insulation plate so as to further reduce the exhaust energy. The multilayer sound absorption structure on the wall surface of the air passage can fully absorb the noise with different frequencies.

In addition, the noise elimination test chamber is also provided with a tail gas discharge pipeline, and the tail gas of the diesel engine is discharged into the exhaust passage 5 through a high-temperature-resistant hose, so that the tail gas is prevented from being discharged into the chamber body 1, the performance of the noise elimination chamber is reduced, and meanwhile, the temperature in the chamber is prevented from rising and the working performance of equipment is prevented from being reduced due to the fact that the tail gas is discharged into the chamber body.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A noise elimination test chamber for a diesel-electric range extender is characterized by comprising a chamber body, a chamber door, an observation window, an air inlet channel and an air exhaust channel; wherein, a plurality of layers of sound absorption structures are arranged around the cabin body, and each layer of sound absorption structure has different sound absorption frequency bands; the cabin door is arranged on the cabin body, and adopts a multilayer sound absorption structure the same as that of the cabin body; an observation window is arranged on the side of the cabin body; an air inlet channel and an air outlet channel which are communicated with the interior of the cabin body are respectively arranged on two sides of the top of the cabin body, the air inlet channel is used for supplying fresh air to the diesel engine, and the air outlet channel is used for discharging heat flow of the thermal management system of the diesel-electric range extender out of the cabin.

2. The muffling test chamber of claim 1, wherein the chamber is of steel-frame construction.

3. The muffling test chamber of claim 1, wherein the multilayer sound absorbing structure comprises, in order from the outside to the inside, a metal sound absorbing panel, a first sound absorbing wool, a second sound absorbing wool, a gas cavity, and a structural sound absorbing panel.

4. The muffling test chamber of claim 3, wherein the first sound-absorbing cotton has a greater density than the second sound-absorbing cotton.

5. The muffling test chamber of claim 1, wherein joints between two doors, joints between the doors and the chamber body, and joints between the doors and the ground are sealed by sound-insulating rubber strips.

6. The muffling test chamber of claim 1, wherein the viewing window utilizes bullet-proof glass and employs a double-layer vacuum structure.

7. The muffling test chamber of claim 1, wherein the air inlet channel and the air outlet channel are of a steel frame structure, and a multilayer sound absorption structure identical to the chamber body is arranged on the wall surface of each air inlet channel and each air outlet channel.

8. The muffling test chamber of claim 7, wherein the air inlet channel is in an up-in and down-out mode, a 90-degree corner is arranged at the bottom of the air channel after the air inlet channel enters the chamber body, and a porous sound insulation plate is transversely arranged in the air inlet channel.

9. The muffling test chamber of claim 7, wherein the exhaust passage is of a double-layer structure, the air passage comprises 4 right-angle turns, and a porous sound-insulating plate is transversely arranged in the exhaust passage.

10. The muffling test chamber of claim 1, wherein the muffling test chamber is further provided with a tail gas exhaust pipeline, and the tail gas of the diesel engine is exhausted to the exhaust channel through a high-temperature-resistant hose.