CN112377289B - Reduce supply vehicle noise cancelling structure of infrared characteristic - Google Patents

Abstract

The invention discloses a power supply vehicle noise elimination structure for reducing infrared characteristics, which is characterized by comprising a smoke inlet pipe, wherein one end of the smoke inlet pipe is connected with an exhaust port of a diesel engine; one side of the ascending pipe group is provided with a cooling water tank for cooling the diesel engine, and one side of the cooling water tank close to the diesel engine is provided with a diesel engine fan. The invention restrains the main noise sources (namely exhaust noise and mechanical noise) of the liquid-cooled diesel engine, and simultaneously cools the waste gas discharged by the liquid-cooled diesel engine, thereby reducing the infrared characteristic.

Description

A noise-cancelling structure for power vehicle with reduced infrared characteristics

technical field

The invention relates to a noise reduction structure for a power supply vehicle, in particular to a noise reduction structure for a power supply vehicle with reduced infrared characteristics, and belongs to the field of mechanical engineering.

Background technique

The function of a power supply vehicle is to accompany a certain weapon system and provide working power for a certain weapon system under field conditions. Its working mode is that the liquid-cooled diesel engine drives the synchronous generator to generate electricity, but the liquid-cooled diesel engine will generate relatively large noise during operation, which will bring discomfort to the officers and soldiers of the weapon system operation and reduce the ergonomics. The higher exhaust gas temperature creates a larger infrared signature that affects tactical concealment.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: how to reduce the noise when the power supply vehicle is working and how to reduce the infrared characteristics.

In order to solve the above technical problems, the technical solution of the present invention is to provide a noise reduction structure for a power supply vehicle with reduced infrared characteristics. Pre-muffler, the other end of the smoke inlet pipe is connected to the second expansion chamber through the expansion chamber structure, the second expansion chamber is connected to the third expansion chamber through the ascending pipe group, and the third expansion chamber is provided with a connection to it. The smoke exhaust port is provided with an exhaust muffler between the second expansion chamber and the third expansion chamber; a cooling water tank for cooling the diesel engine is arranged on one side of the upward pipe group, and a diesel engine fan is arranged on the side of the cooling water tank close to the diesel engine.

Preferably, the pre-muffler has a micro-porous plate structure; the pre-muffler is provided with a micro-porous plate and a partition, the micro-porous plate and the partition divide the pre-muffler into multiple parts, and the micro-porous plate is provided with Multiple micropores.

Preferably, the pre-muffler is provided with at least one layer of micro-porous plates, and each layer of the micro-porous plate is provided with a plurality of partitions connected to the inner wall of the pre-muffler.

Preferably, the exhaust muffler comprises a porous aluminum plate and a sound-absorbing material layer, the porous aluminum plate forms a plurality of exhaust ducts, and a sound-absorbing material layer is arranged between any two adjacent exhaust ducts; one end of the exhaust duct is arranged on the upper One side of the pipe group and the other end of the exhaust duct are connected to the atmosphere.

Preferably, the exhaust duct is an inverted V-shaped structure.

Preferably, shutters are provided on the outer wall of the exhaust muffler.

Preferably, the expansion cavity structure includes a first expansion cavity, the other end of the smoke inlet pipe is connected with the first expansion cavity, and the other end of the first expansion cavity is connected with the second expansion cavity.

Preferably, the expansion cavity structure includes at least one descending tube group and a corresponding first expansion cavity, all descending pipe groups are connected in series with the first expansion cavity at intervals, and the other end of the smoke inlet pipe is connected to the first expansion cavity of the head end. The expansion chamber is connected, and the second expansion chamber is connected with the descending tube group at the tail end.

Preferably, the descending pipe group and the ascending pipe group are both composed of a plurality of through-pipe arrays, and are arranged in the same cavity, and the cavity is connected with the cooling water tank through a transition joint; each through-pipe is sleeved with a plurality of heat sink.

Preferably, the walls of the first expansion cavity, the second expansion cavity and the third expansion cavity are all covered with a layer of heat insulating material.

The noise reduction structure of a power supply vehicle with reduced infrared characteristics of the present invention suppresses the main noise sources (ie exhaust noise and mechanical noise) of the liquid-cooled diesel engine, and simultaneously cools the exhaust gas discharged from the liquid-cooled diesel engine. Reduced infrared signature.

Description of drawings

FIG. 1 is a schematic diagram of a noise reduction structure of a power supply vehicle with reduced infrared characteristics.

Detailed ways

In order to make the present invention more obvious and comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Example 1

The present invention provides a noise reduction structure for a power supply vehicle with reduced infrared characteristics, as shown in FIG. , The third expansion chamber 19, the exhaust port 1, the exhaust muffler 4 and the shutter 2 are composed. One end of the smoke inlet pipe 15 is connected to the exhaust port of the diesel engine, the outer side of the smoke inlet pipe 15 is provided with a pre-muffler 16, and the other end of the smoke inlet pipe 15 is connected to the first expansion cavity 18, and the first expansion cavity 18 passes through the descending pipe The group 10 is connected to the second expansion chamber 7, the second expansion chamber 7 is connected to the third expansion chamber 19 through the ascending tube group 8, the third expansion chamber 19 is provided with a smoke exhaust port 1 connected to it, and the second An exhaust muffler 4 is provided between the expansion chamber 7 and the third expansion chamber 19; a cooling water tank 13 for cooling the diesel engine is provided on one side of the descending pipe group 10 and the ascending pipe group 8, and the side of the cooling water tank 13 close to the diesel engine is provided with Diesel fan 12.

The pre-muffler 16 adopts a micro-porous plate structure. In this embodiment, the pre-muffler 16 is provided with a double-layer micro-porous plate 17, that is, the pipe wall is densely covered with micro-holes. The orifice plate 17 and the partition plate 14 divide the pre-muffler 16 into multiple parts; the descending pipe group 10 and the ascending pipe group 8 are both composed of a plurality of through pipe arrays, which communicate with the first expansion cavity 18, the second expansion cavity 7 and the first expansion cavity 18. Three expansion chambers 19, each of which is covered with a plurality of cooling fins 9; the walls of the first expansion chamber 18, the second expansion chamber 7 and the third expansion chamber 19 are covered with a thermal insulation material layer 20; the third expansion chamber The outer wall of 19 is provided with a smoke exhaust port 1; the exhaust muffler 4 is composed of a porous aluminum plate 6 and a sound-absorbing material layer 5. The porous aluminum plate 6 forms a plurality of inverted V-shaped exhaust ducts 3, and the sound-absorbing material is filled between the porous aluminum plates 6. A sound-absorbing material layer 5 is formed; the sound-absorbing material layer 5 is arranged between any two adjacent exhaust ducts 3 . A shutter 2 is provided on the outer wall of the exhaust muffler 4 . One end of the exhaust duct 3 is arranged on one side of the upward pipe group 8, and the other end of the exhaust duct 3 is connected to the atmosphere.

The noise suppression principle of the present invention is:

1. Exhaust noise: When the power supply car is working, the liquid-cooled diesel engine drives the synchronous generator to generate electricity, and the exhaust gas discharged from the diesel engine first enters the pre-muffler 16 through the smoke inlet pipe 15, which belongs to the impedance composite muffler. The orifice plate 17 and the baffle 14 initially silence the exhaust noise, and then the exhaust gas enters the first expansion chamber 18, the descending pipe group 10, the second expansion chamber 7, the ascending pipe group 8, the third expansion chamber 19, and the ascending pipe group. 8. The descending pipe group 10 is composed of a plurality of through-pipe arrays. The diameter of the through-pipes is relatively small and the pipe length is long, which further attenuates the exhaust noise. The three expansion chambers are equivalent to three resistant expansion chambers. The exhaust noise is attenuated again, and finally the exhaust gas is discharged out of the vehicle through the exhaust port 1.

2. Mechanical noise: The mechanical noise (including the exhaust noise of the diesel engine fan) during the operation of the diesel generator set of the power vehicle will be repeatedly reflected between the porous aluminum plates 6 of the inverted V-shaped exhaust duct 3 when it passes through the exhaust muffler 4 and absorbed by the sound-absorbing material layer 5 in the perforated aluminum plate 6, and the mechanical noise outside the power supply vehicle is greatly attenuated.

The infrared feature suppression principle of the present invention is:

Using the cooling airflow generated by the diesel engine fan 12 of the cooling water tank 13 of the diesel engine, the cooling airflow generated by the diesel engine fan 12 first passes through the cooling water tank 13 of the liquid-cooled diesel engine, and then blows through the transition section 11. , a large number of radiating fins 9 are set on the through pipe of the pipe group, the heat of the diesel engine exhaust gas in the through pipe is taken away by the cooling airflow, and the temperature is greatly reduced. After the diesel engine exhaust gas enters the expansion chamber, the temperature is further reduced due to the expansion of the gas. The smoke port 1 is discharged from the power supply vehicle, and the diesel engine exhaust gas is mixed downward into the cooling airflow discharged from the exhaust muffler 4, and the temperature is reduced again. The above measures greatly reduce the infrared characteristics of the diesel engine exhaust gas.

Example 2

In this embodiment, the other end of the smoke inlet pipe 15 is connected to the first expansion chamber 18 , and the other end of the first expansion chamber 18 is connected to the second expansion chamber 7 .

Others are the same as in Example 1.

Example 3

In this embodiment, the noise reduction structure of the power supply vehicle includes at least two descending tube groups 10 and corresponding first expansion chambers 18 . All the descending pipe groups 10 are connected in series with the first expansion chambers 18 at intervals. The other end is connected to the first expansion chamber 18 at the head end, and the second expansion chamber 7 is connected to the descending tube group 10 at the tail end.

Others are the same as in Example 1.

Claims (7)

1. A silencing structure of a power supply vehicle for reducing infrared characteristics is characterized by comprising a smoke inlet pipe (15) with one end connected with an exhaust port of a diesel engine, wherein a front silencer (16) is arranged on the outer side of the smoke inlet pipe (15), the other end of the smoke inlet pipe (15) is communicated with a second expansion cavity (7) through an expansion cavity structure, the second expansion cavity (7) is communicated with a third expansion cavity (19) through an ascending pipe group (8), a smoke outlet (1) communicated with the third expansion cavity (19) is formed in the third expansion cavity (19), and an exhaust silencer (4) is arranged between the second expansion cavity (7) and the third expansion cavity (19); a cooling water tank (13) for cooling the diesel engine is arranged on one side of the ascending pipe group (8), and a diesel engine fan (12) is arranged on one side, close to the diesel engine, of the cooling water tank (13);

the expansion cavity structure comprises at least one descending pipe group (10) and a first expansion cavity (18) corresponding to the descending pipe group, all the descending pipe groups (10) are connected with the first expansion cavity (18) at intervals in series, the other end of the smoke inlet pipe (15) is communicated with the first expansion cavity (18) at the head end, and the second expansion cavity (7) is communicated with the descending pipe group (10) at the tail end; the descending pipe group (10) and the ascending pipe group (8) are both composed of a plurality of through pipe arrays and are arranged in the same cavity, and the cavity is connected with a cooling water tank (13) through a transition joint (11); each through pipe is sleeved with a plurality of radiating fins (9).

2. The structure of claim 1, wherein the pre-muffler (16) is of a micro-perforated plate structure; a micropore plate (17) and a partition plate (14) are arranged in the front silencer (16), the front silencer (16) is divided into a plurality of parts by the micropore plate (17) and the partition plate (14), and a plurality of micropores are formed in the micropore plate (17).

3. The structure of claim 2, wherein the front muffler (16) is provided with at least one layer of micro-porous plate (17), and each layer of micro-porous plate (17) is provided with a plurality of partition plates (14) connected with the inner wall of the front muffler (16).

4. The power supply vehicle noise elimination structure for reducing the infrared characteristic according to claim 1, wherein the exhaust muffler (4) comprises a porous aluminum plate (6) and a sound absorption material layer (5), the porous aluminum plate (6) forms a plurality of exhaust ducts (3), and the sound absorption material layer (5) is arranged between any two adjacent exhaust ducts (3); one end of the exhaust duct (3) is arranged at one side of the ascending pipe group (8), and the other end of the exhaust duct (3) is communicated with the atmosphere.

5. The muffling structure of the power supply vehicle for reducing the infrared characteristics of claim 4, wherein the exhaust duct (3) is of an inverted V-shaped structure.

6. The structure of claim 4, wherein the outer wall of the exhaust muffler (4) is provided with a shutter (2).

7. The muffling structure of the power supply vehicle for reducing the infrared characteristic of claim 1, wherein the walls of the first expansion cavity (18), the second expansion cavity (7) and the third expansion cavity (19) are coated with a heat-insulating material layer (20).

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