CN202203005U - Double-helix air inlet channel - Google Patents

Abstract

The utility model provides a double helix intake duct belongs to car technical field. The double-helix air inlet channel solves the problems that the existing double-helix air inlet channels are large in mutual interference and the overall vortex ratio in an air cylinder is relatively small. This double helix intake duct, locate including a first helical intake duct and one the second helical intake duct of first helical intake duct one side, the one end of first helical intake duct and the one end of second helical intake duct are connected to on a cylinder respectively, first helical intake duct is asymmetric structure with second helical intake duct, the first helix angle of first helical intake duct is less than the second helix angle of second helical intake duct, the warp the air velocity of first helical intake duct outflow is central asymmetric distribution, warp the air velocity of second helical intake duct outflow is central symmetric distribution. The utility model discloses not only reduced the interference effect between first helical air inlet and the second helical air inlet, improved holistic vortex ratio in the cylinder moreover.

Description

double helix inlet

technical field

The utility model belongs to the technical field of automobiles, and relates to an air inlet of an automobile engine, in particular to a double helix air inlet.

Background technique

The engine is the heart of a car, providing power for the car to run, and the emission index has become an important indicator for evaluating the performance of various engines. Emission indicators mainly refer to the amount of harmful emissions contained in the gas discharged from the engine oil tank and crankcase and the exhaust gas discharged from the cylinder. It is related to human health and the environment on which it depends. Therefore, the governments of various countries have formulated strict control regulations in order to reduce the pollution of engine exhaust to the environment.

As the emission regulations of various countries become more and more stringent, because the overall performance requirements of the engine are getting higher and higher, the air intake condition of the engine directly affects its economy, power and emission performance, so the shape design of the intake port has a great impact on the engine. Saying matters. At present, there are two types of air intakes that realize the vortex flow in the cylinder of diesel engines: tangential air passages and helical air passages. Compared with the tangential air passage, the helical air passage can form a stronger intake vortex, so it is more widely used in diesel engines. In order to increase the intake air volume, most of the double helix inlets are used nowadays, but because the traditional double helix inlets all use large helix angle air passages, the double vortex flows with similar strengths generated by the two interfere with each other. Therefore, compared with the single-spiral air channel, the vortex intensity of the double-spiral air intake is relatively low, resulting in poor fuel economy and high emissions. It is difficult to meet the current emission requirements, so it must be improved.

Contents of the invention

The purpose of this utility model is to solve the above-mentioned problems in the existing technology, and to provide a double helix inlet, which not only reduces the interference between the double vortexes but also improves the overall swirl ratio in the cylinder .

The purpose of the utility model can be achieved through the following technical solutions: a double helical inlet, including a first helical inlet and a second helical inlet on one side of the first helical inlet One end of the first helical inlet and one end of the second helical inlet are respectively connected to a cylinder, the first helical inlet and the second helical inlet are asymmetric structures, the first helical inlet The first helix angle of a helical inlet is smaller than the second helix angle of the second helical inlet, and the airflow velocity of the outflow airflow through the first helical inlet is asymmetrically distributed in the center, and the airflow velocity through the second helical inlet is asymmetrically distributed. The airflow velocity of the airflow out of the airway is center-symmetrical.

The double helix inlet is provided with a first helix inlet and a second helix inlet with an asymmetric structure, the airflow velocity of the air flowing out through the first helix inlet is asymmetrically distributed in the center, and through the second helix The airflow velocity of the airflow out of the inlet is symmetrically distributed in the center; there is a difference in the vortex strength between the first helical inlet and the second helical inlet, thereby greatly reducing the interference between the double vortexes, thereby improving The overall swirl ratio in the cylinder.

In the above-mentioned a kind of double helix intake port, the connection line between the spiral starting end and the spiral center of the first spiral intake port is set as the first connection line, and the spiral center and the cylinder of the first spiral intake port are set. The connecting line between the centers is the second connecting line, the angle of the first connecting line rotating counterclockwise to the second connecting line is 200°～300°, and the spiral starting end and the spiral center of the second spiral inlet are set The connecting line between them is the third connecting line, the connecting line between the spiral center of the second helical inlet port and the cylinder center is set as the fourth connecting line, and the third connecting line rotates counterclockwise to the fourth connecting line The angle is 160°～200°.

The angle at which the first connection is rotated counterclockwise to the second connection is 200°-300°, and the angle at which the third connection is rotated counterclockwise to the fourth connection is 160°-200°; the first The vortex intensity of the helical inlet is smaller than that of the second helical inlet, thereby reducing the interference effect of the first helical inlet on the second helical inlet.

In the above-mentioned double helical inlet, the first helix angle of the first helical inlet is 190°-210°, and the second helix angle of the second helical inlet is 290°-310°.

The first helix angle of the first helical inlet is 190°-210°, so the airflow velocity of the airflow outflowing through the first helical inlet is asymmetrically distributed in the center, and the second helical inlet of the second helical inlet The helix angle is 290°-310°, so the velocity of the airflow outflowing through the second helical inlet is center-symmetrically distributed.

In the above-mentioned double helical inlet, the first helical inlet has a first helical duct and a first straight duct extending from one end of the first helical duct, and the second helical inlet has a first Two helical pipes, and a second straight pipe extending from one end of the second helical pipe; the other end of the first helical pipe and the other end of the second helical pipe are respectively connected to the cylinder.

The gas enters the cylinder to form a strong vortex after passing through the first straight pipe, the first helical pipe, the second straight pipe and the second helical pipe in sequence.

In the above-mentioned double helical inlet, the first helical inlet and the second helical inlet are parallel to each other.

Compared with the prior art, the double helix inlet of the utility model is provided with the first helix inlet and the second helix inlet with an asymmetric structure, and the first helix angle is smaller than the second helix angle, thereby reducing the While reducing the interference effect between the first helical inlet port and the second helical inlet port, the intake air volume is increased, and the overall swirl ratio in the cylinder is improved.

Description of drawings

Fig. 1 is the schematic diagram of the utility model double-helix air inlet and cylinder cooperation.

In the figure, 10, the first helical inlet; 11, the first helical duct; 12, the first straight duct; B1, the first helix angle; 20, the second helical inlet; 21, the second helical duct; 22 , the second straight pipe; B2, the second helix angle; 30, the cylinder.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

Please refer to FIG. 1 , the double helical inlet of the present invention includes a first helical inlet 10 and a second helical inlet 20 disposed on one side of the first helical inlet 10 . One end of the first helical inlet 10 and one end of the second helical inlet 20 are respectively connected to a cylinder 30 of an engine. In this embodiment, the first helical inlet channel 10 and the second helical inlet channel 20 are parallel to each other, so that not only the structure is compact but also better structural rigidity can be obtained.

Please continue to refer to FIG. 1 , the first helical inlet 10 and the second helical inlet 20 have an asymmetric structure. The first spiral inlet 10 has a first spiral duct 11 and a first straight duct 12 extending from one end of the first spiral duct 11 . The second spiral inlet 20 has a second spiral duct 21 and a second straight duct 22 extending from one end of the second spiral duct 21 . The other end of the first spiral pipe 11 and the other end of the second spiral pipe 21 are respectively connected to the cylinder 30 . The connection line between the spiral starting end and the spiral center of the first spiral inlet 10 is set as the first connection line. The connecting line between the spiral center of the first spiral intake port 10 and the center of the cylinder 30 is set as the second connecting line. The angle at which the first connection is rotated counterclockwise to the second connection is set as A1. The connecting line between the spiral starting end and the spiral center of the second spiral inlet 20 is set as the third connecting line. The connecting line between the spiral center of the second spiral intake port 20 and the center of the cylinder 30 is set as the fourth connecting line. The angle at which the third connecting line rotates counterclockwise to the fourth connecting line is set as A2. The connecting line between the helical terminal end and the spiral center of the first helical inlet 10 is set as the fifth connecting line; Wire. The helix angle of the first helical inlet 10 is set as the first helix angle B1, and the helix angle of the second helical inlet 20 is set as the second helix angle B2. The first helix angle B1 refers to an angle that rotates clockwise from the first line to the fifth line. The second helix angle B2 refers to an angle that rotates clockwise from the third line to the sixth line.

Please continue to refer to FIG. 1 . Experiments show that when the angle A1 or A2 is 200°-300°, the interference to the other spiral intake port is significant, resulting in a significant decrease in the overall swirl ratio in the cylinder 30 . Due to the spatial arrangement, it is difficult to keep the angles A1 and A2 away from the range of 200°-300°. Therefore, in this embodiment, A1 is set at 200°-300°, and A2 is set at 160°-200°. And the first helix angle B1 of the first helical inlet 10 is set to be smaller than the second helix B2 of the second helical inlet 20 . The airflow velocity of the airflow flowing out through the first helical inlet channel 10 is distributed centrally asymmetrically; while the airflow velocity of the airflow flowing out through the second helical inlet channel 20 is distributed centrally and symmetrically. In this embodiment, the first helix angle B1 of the first helical inlet 10 is 190°-210°, and the second helix angle B2 of the second helical inlet 20 is 290°-310°. There is a difference in the swirl intensity between the first spiral intake port 10 and the second spiral intake port 20 , thereby greatly reducing the interference between the double swirl flows, and further increasing the overall swirl ratio in the cylinder 30 .

Please continue to refer to FIG. 1 , the double helical inlet is provided with a first helical inlet 10 and a second helical inlet 20 arranged asymmetrically. During the working process of the engine, the gas passes through the first straight duct 12 into the first helical duct 11 , and the airflow velocity of the gas flowing out through the first helical duct 11 is distributed centrally asymmetrically. The gas passes through the second straight pipe 22 into the second helical pipe 21 , and the velocity of the gas flow out of the second helical pipe 21 is center-symmetrically distributed. The air flow flowing out through the first helical inlet port 10 and the second helical inlet port 20 enters the cylinder to form a strong vortex. The first helix angle B1 of the first helical inlet 10 is smaller than the second helix B2 of the second helical inlet 20 . Therefore, the vortex intensity of the first helical inlet 10 is smaller than the vortex intensity of the second helical inlet 20, thereby reducing the interference effect of the first helical inlet 10 on the second helical inlet 20 and at the same time The intake air volume is increased, and the overall swirl ratio in the cylinder 30 is improved; furthermore, the fuel and gas are mixed more evenly, the combustion is more complete, the fuel economy is effectively improved, and the emission of harmful gases is reduced.

In summary, the double helical inlet of the present invention passes through the first helical inlet 10 and the second helical inlet 20 with an asymmetric structure, and the first helical inlet of the first helical inlet 10 The angle B1 is smaller than the second helix angle B2 of the second helical inlet 20, thereby reducing the interference between the first helical inlet 10 and the second helical inlet 20 while increasing the intake air volume , The overall swirl ratio in the cylinder 30 is improved.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (5)

1. double helix intake duct; Comprise that one first spiral inlet duct (10) and is located at second spiral inlet duct (20) of said first spiral inlet duct (10) one sides; One end of one end of said first spiral inlet duct (10) and second spiral inlet duct (20) is connected to respectively on the cylinder (30); It is characterized in that: said first spiral inlet duct (10) is a non-symmetry structure with second spiral inlet duct (20); First helix angle (B1) of said first spiral inlet duct (10) is less than second helix angle (B2) of second spiral inlet duct (20); Airspeed through said first spiral inlet duct (10) effluent stream is the center asymmetric distribution, through the distribution that is centrosymmetric of the airspeed of said second spiral inlet duct (20) effluent stream.

2. double helix intake duct according to claim 1; It is characterized in that; Spiral starting point and the line between the spiral center of setting first spiral inlet duct (10) are first line; Setting the spiral center of first spiral inlet duct (10) and the line between cylinder (30) center is second line, said first line be rotated counterclockwise to the angle (A1) of second line be 200 °～300 °; Spiral starting point and the line between the spiral center of setting second spiral inlet duct (20) are the 3rd line; Setting the spiral center of second spiral inlet duct (20) and the line between cylinder (30) center is the 4th line, said the 3rd line be rotated counterclockwise to the angle (A2) of the 4th line be 160 °～200 °.

3. double helix intake duct according to claim 1 and 2 is characterized in that, first helix angle (B1) of said first spiral inlet duct (10) is 190 °～210 °, and second helix angle (B2) of said second spiral inlet duct (20) is 290 °～310 °.

4. double helix intake duct according to claim 3; It is characterized in that; Said first spiral inlet duct (10) has one first helical pipe (11), and first straight pipeline (12) that extended to form by an end of first helical pipe (11), and said second spiral inlet duct (20) has one second helical pipe (21), and second straight pipeline (22) that extended to form by an end of second helical pipe (21); The other end of the other end of said first helical pipe (11) and second helical pipe (21) is connected to respectively on the said cylinder (30).

5. double helix intake duct according to claim 4 is characterized in that, said first spiral inlet duct (10) and second spiral inlet duct (20) are parallel to each other.

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