CN111350585B

CN111350585B - Turbocharger and vehicle

Info

Publication number: CN111350585B
Application number: CN201811578918.9A
Authority: CN
Inventors: 潘红军; 张泽裕; 王澎; 王向军; 高君; 郑建设; 朱林林; 杨春玲
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2021-12-21
Anticipated expiration: 2038-12-24
Also published as: CN111350585A

Abstract

The invention discloses a turbocharger and a vehicle, wherein the turbocharger comprises: volute, air inlet, VGT subassembly and buffering clearance. The volute is provided with an installation space and a vertical wall and a transverse wall; the air inlet is arranged on the volute; the VGT assembly is arranged in the installation space, the VGT assembly divides the installation space into a first space and a second space, the first space is communicated with the air inlet, and a turbine is arranged in the second space; the slow flow gap is formed between the volute and the VGT assembly, the air inlet end of the slow flow gap is communicated with the first space, and the air outlet end of the slow flow gap is communicated with the second space. The turbocharger can act on all the waste gas entering the turbocharger on the turbine to do work on the turbine, so that the waste of energy can be effectively avoided, and the efficiency of the turbocharger can be effectively increased to improve the performance of the turbocharger.

Description

Turbocharger and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a turbocharger and a vehicle.

Background

After the VGT and the volute are installed in a matched mode in the turbocharger type in the prior art, waste gas leaked between the VGT and the volute is directly discharged from an exhaust port of the volute instead of doing work through a turbine, so that the efficiency and performance of the turbocharger are reduced, and an improvement space exists.

Disclosure of Invention

In view of the above, the present invention is directed to a turbocharger with higher efficiency and better performance.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a turbocharger, comprising: a scroll having a mounting space, the scroll further having a vertical wall and a horizontal wall; an air inlet disposed on the volute; a VGT assembly disposed within the installation space, the VGT assembly dividing the installation space into a first space and a second space, the first space communicating with the air inlet, the second space having a turbine disposed therein; the slow flow gap is formed between the volute and the VGT assembly, the air inlet end of the slow flow gap is communicated with the first space, and the air outlet end of the slow flow gap is communicated with the second space; the VGT assembly includes: the rear cover is provided with a slow flow gap, a first channel of the slow flow gap is formed between the rear cover and the scroll casing, the end wall of the rear cover and the vertical wall of the rear cover, the air inlet end of the rear cover is formed at the outer end of the first channel, and the width of the first channel is 0.2-0.4 mm; and a buffer arc wall which is bent in the direction away from the rear cover is connected between the vertical wall and the transverse wall, and the radius of the circle where the buffer arc wall is located is more than or equal to 0.5 mm.

Further, the slow flow gap further includes: the second channel is connected between the first channel and the third channel, a plurality of mounting grooves are formed in the peripheral surface of the transverse wall, a sealing ring is arranged between each mounting groove and the side wall of the rear cover, and the second channel is formed between the sealing ring and the mounting grooves.

Further, the distance between the side wall of the rear cover and the transverse wall is 0.4-0.6 mm.

Further, the distance between the bottom wall of the sealing ring and the bottom wall of the mounting groove is 0.4-0.6 mm.

Further, the distance between the side walls of the two sides of the sealing ring and the side walls of the two sides of the mounting groove is 0.04-0.05 mm.

Further, in the radial direction of the volute, the overlapping size of the mounting groove and the sealing ring is less than or equal to 0.4 mm.

Further, the number of the mounting grooves is two.

Furthermore, the rear cover is provided with a mounting flange, an arc transition wall is arranged between the side wall of the rear cover and the mounting flange, an initial section of the third channel is formed between the arc transition wall and the tail end of the transverse wall, one end of the transverse wall, which is far away from the vertical wall, is obliquely arranged towards the concave direction of the mounting groove to form an inclined wall, an inclined transition section of the third channel is formed between the inclined wall and the side wall of the mounting flange, the tail end of the inclined wall extends towards the direction, which is far away from the vertical wall, to form a straight plate, a final section of the third channel is formed between the straight plate and the end wall of the mounting flange, and the gas outlet end is formed at the tail end of the final section.

Further, the width of the inclined transition section is gradually reduced from the end of the inclined transition section connected with the starting section to the end of the inclined transition section connected with the ending section.

Compared with the prior art, the turbocharger provided by the invention has the following advantages:

the turbocharger can apply all the exhaust gas entering the turbocharger on the turbine to apply work to the turbine, can effectively avoid energy waste, and can effectively increase the efficiency of the turbocharger so as to improve the performance of the turbocharger.

Another object of the invention is to propose a vehicle comprising a turbocharger as described above, the turbocharger of which has better performance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a cross-sectional view of a turbocharger according to an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a turbocharger according to an embodiment of the present invention;

fig. 3 is a schematic size diagram of a slow flow gap according to an embodiment of the present invention.

Description of reference numerals:

100-turbocharger, 1-volute, 11-installation space, 2-air inlet, 3-VGT component, 111-first space, 112-second space, 4-turbine, 5-slow flow gap, 31-rear cover, 51-first channel, 52-second channel, 53-third channel, 12-vertical wall, 13-transverse wall, 131-installation groove, 6-sealing ring, 14-buffer arc wall, 311-installation flange, 312-arc transition wall, 531-initial section, 15-inclined wall, 532-inclined transition section, 16-flat plate, 533-final section, 161-first arc surface, 3111-second arc surface, 32-blade, 54-air inlet end and 55-air outlet end.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

A turbocharger 100 according to an embodiment of the present invention is described below with reference to fig. 1-3.

The turbocharger 100 according to the embodiment of the present invention may include: volute 1, air inlet 2, VGT subassembly 3 and slow flow clearance 5.

As shown in fig. 1, a scroll 1 has an installation space 11, an intake port 2 is disposed on the scroll 1 and communicates with the installation space 11, wherein a VGT (Variable geometry turbocharger) assembly 3 is disposed in the installation space 11, the VGT assembly 3 divides the installation space 11 into a first space 111 and a second space 112, the first space 111 communicates with the intake port 2, a turbine 4 is disposed in the second space 112, exhaust gas is adapted to enter the first space 111 from the intake port 2, passes through the VGT assembly 3 and then reaches the second space 112, and applies work to the turbine 4 to rotate the turbine 4, thereby achieving the effect of assisting the vehicle engine.

Further, after the VGT assembly 3 is fitted into the mounting space 11, a mounting gap is inevitably generated between the VGT assembly 3 and the scroll 1. In the prior art, the outlet of the gap is directly communicated with the exhaust port of the volute 1, that is, the exhaust gas flowing out from the installation gap does not pass through the turbine 4 and cannot do work on the turbine 4, so that energy loss is caused, and the efficiency of the whole turbocharger 100 is reduced.

To solve this problem, the embodiment of the present invention forms the installation gap as the slow flow gap 5 formed between the scroll 1 and the VGT assembly 3, wherein the air inlet end 54 of the slow flow gap 5 communicates with the first space 111, and the air outlet end 55 of the slow flow gap 5 communicates with the second space 112. That is, part of the exhaust gas in the first space 111 will enter the slow flow gap 5 from the inlet end 54, and then flow into the second space 112 from the outlet end 55 through the slow flow gap 5, so as to ensure that all the exhaust gas entering from the inlet 2 can do work on the turbine 4 arranged in the second space 112, thereby achieving the purpose of no energy waste, and further effectively improving the efficiency of the turbocharger 100, so as to improve the performance thereof.

In connection with the embodiment shown in fig. 1 and 2, the VGT assembly 3 comprises: the vane 32 controls the size of a communication hole between the first space 111 and the second space 112 by its rotation, and the rear cover 31, the vane 32 controls the rate of the exhaust gas entering into the second space 112, and thus controls the power of the turbocharger 100, and the rear cover 31 is used for being fixedly connected with the scroll 1 to stably arrange the vane 32 in the installation space 11, wherein a slow flow gap 5 is formed between the rear cover 31 and the scroll 1.

Further, referring to fig. 3, in combination with the embodiment shown in fig. 1 and 2, the scroll 1 has a vertical wall 12, a first passage 51 forming a slow flow gap 5 is formed between the end wall of the rear cover 31 and the vertical wall 12, an air inlet 54 is formed at the outer end of the first passage 51, and the exhaust gas in the first space 111 is adapted to enter the first passage 51 from the air inlet 54. Wherein, in order to avoid interference of the end wall of the rear cover 31 with the vertical wall 12 during high temperature deformation and to avoid indirectly causing jamming of the VGT assembly 3, the width H1 of the first gap may be set to 0.2-0.4mm (this range includes boundary values).

Still further, the scroll 1 further has a lateral wall 13, and a buffer arc wall 14 curved in a direction away from the back cover 31 is connected between the vertical wall 12 and the lateral wall 13. Specifically, the first passage 51 and the buffer arc wall 14 form a throttling expansion process, and the exhaust gas at the air inlet end 54 flows to the buffer arc wall 14 through the first passage 51 to form a first throttling, so that the sealing performance is better. In order to reduce the problem of thermal stress concentration generated at the buffer arc wall 14, the radius R of the circle where the buffer arc wall 14 is located is set to be greater than 0.5mm (this range includes boundary values).

According to the turbocharger 100 of the embodiment of the invention, all the exhaust gas entering the turbocharger 100 can act on the turbine 4 to do work on the turbine 4, so that the waste of energy can be effectively avoided, and the efficiency of the turbocharger 100 can be effectively increased to improve the performance of the turbocharger.

As shown in fig. 1 and 2, the slow flow gap 5 further includes: a second channel 52 and a third channel 53, the second channel 52 being connected between the first channel 51 and the third channel 53. Specifically, the exhaust gas entering from the inlet end 54 is adapted to be discharged from the outlet end 55 into the second space 112 through the first passage 51, the second passage 52, and the second passage 52 in this order.

Further, the outer peripheral surface of the partial transverse wall 13 is recessed inwards to form a plurality of mounting grooves 131, a sealing ring 6 is arranged between each mounting groove 131 and the rear cover 31, and the sealing ring 6 plays a certain role in sealing and blocking flow so as to prevent more waste gas from flowing through the slow flow gap 5.

Wherein the second passage 52 is formed between the sealing ring 6 and the mounting groove 131. Therefore, the waste gas entering the second channel 52 can sequentially pass through the gap between the side wall of the rear cover 31 and the transverse wall 13 and the gap between the sealing ring 6 and the groove wall of the mounting groove 131, so that an airflow channel similar to a step structure is realized, the direction of the airflow can be changed for many times, and the cross section of the airflow channel is contracted and amplified for many times, so that the purpose of throttling for many times is realized.

Specifically, referring to fig. 3 in conjunction with the embodiment shown in fig. 1 and 2, distances H3, H5 between the side wall of the rear cover 31 and the lateral wall 13 and distances H2, H4 between the bottom wall of the packing 6 and the bottom wall of the mounting groove 131 are each defined at 0.4-0.6mm (which range includes a boundary value), distances B1, B2, B3, B4 between both side walls of the packing 6 and both side walls of the mounting groove 131 are each defined at 0.04-0.05mm (which range includes a boundary value), and an overlapping dimension L of the mounting groove 131 and the packing 6 in the radial direction of the scroll 1 is set to be less than 0.4mm to secure a throttling effect.

As a preferred embodiment, referring to fig. 2, there are two mounting grooves 131. From this, can form two step structure air flues in second passageway 52 to carry out the quartic switching-over to waste gas, and the air flow passage cross-section has realized that quartic zooms is in order to form quartic throttle effect, can make throttle effect better, and has formed the 6 structures of double seal ring, has improved the leakproofness between VGT subassembly 3 and the volute 1, in order to avoid waste gas to reveal outside the volute 1.

Specifically, after the sealing ring 6 is installed between the transverse wall 13 and the rear cover 31, under the action of the preload force of the sealing ring 6, the upper end of the sealing ring 6 is in contact with the side wall of the rear cover 31, when exhaust gas flows into the second channel 52, the sealing ring 6 is tightly attached to the rear cover 31 due to the action of air pressure, the exhaust gas cannot directly pass through the space between the sealing ring 6 and the rear cover 31 but must pass through the gap between the sealing ring 6 and the mounting groove 131, and when the air flow flows through the gap between the sealing ring 6 and the mounting groove 131, the air flow can pass through the rapid-slow-rapid flow process to enhance the vortex kinetic energy of the air flow, convert more kinetic energy of the air into heat energy, increase the upstream-downstream pressure difference, and adaptively adjust the sealing ring 6 to improve the sealing performance.

With reference to the embodiment shown in fig. 1 and 2, the rear cover 31 has a mounting flange 311, a circular arc transition wall 312 is provided between the side wall of the rear cover 31 and the mounting flange 311, an initial section 531 of the third channel 53 is formed between the circular arc transition wall 312 and the end of the transverse wall 13, one end of the transverse wall 13 away from the vertical wall 12 is inclined toward the recess of the mounting groove 131 to form an inclined wall 15, an inclined transition section 532 of the third channel 53 is formed between the inclined wall 15 and the side wall of the mounting flange 311, the end of the inclined wall 15 extends away from the vertical wall 12 to form a flat plate 16, a final section 533 of the third channel 53 is formed between the flat plate 16 and the end wall of the mounting flange 311, and the air outlet end 55 is formed at the end of the final section 533. Specifically, the exhaust gas entering the third passage 53 is adapted to flow into the second space 112 through the start section 531, the inclined transition section 532 and the end section 533 in this order and from the gas outlet end 55.

In other words, the starting end, the inclined transition section 532 and the ending section 533 are connected in sequence to form the third channel 53 in an approximate "S" shape, so that the throttling effect of the exhaust gas flowing through the third channel 53 can be performed twice, the sealing effect is better, and the sealing performance is improved.

The arc transition wall 312 is directly tangent to the side wall of the rear cover 31, so that during the process of flowing the exhaust gas from the second channel 52 to the third channel 53, the arc transition wall 312 also throttles the airflow once to match the throttling in the first channel 51 and the second channel 52, thereby forming eight throttling effects altogether, effectively reducing the leakage of the exhaust gas, and improving the sealing performance between the rear cover 31 and the volute 1.

As shown in fig. 2, the width of the sloped transition segment 532 gradually decreases from the end of the sloped transition segment 532 connected to the beginning segment 531 to the end of the sloped transition segment 532 connected to the ending segment 533. This arrangement provides a flow stream constriction effect to provide a two-time throttling effect on the exhaust gas entering the third passage 53, thereby providing a better sealing effect.

Referring to fig. 3, in conjunction with the embodiment shown in fig. 1 and 2, the ratio of the width H6 at the end of the sloped transition 532 connected to the beginning section 531 to the width H7 at the end of the sloped transition 532 connected to the ending section 533 is 1.8-2.5 (this range includes boundary values) to ensure the throttling effect there.

As shown in fig. 2, the free end of the flat plate 16 has a first arcuate surface 161 and the end wall of the mounting flange 311 has a second arcuate surface 3111. That is, the free end of the flat plate 16 defining the air outlet end 55 and the end wall of the mounting flange 311 are both provided with non-sharp structures, so as to prevent the deformation or crack failure of the scroll 1 and the rear cover 31 from affecting the normal use of the supercharger 100.

The structural widths of the first circular arc surface 161 and the second circular arc surface 3111 can be controlled to be greater than 0.7 mm.

A vehicle according to another aspect of an embodiment of the present invention includes the turbocharger 100 described in the above embodiment. Other configurations of the vehicle, such as transmissions, braking systems, steering systems, etc., are known in the art and well known to those skilled in the art, and therefore will not be described in detail herein.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A turbocharger (100), comprising:

-a volute (1), said volute (1) having an installation space (11), said volute (1) further having a vertical wall (12) and a transverse wall (13);

the air inlet (2), the said air inlet (2) is set up on the said volute (1);

a VGT assembly (3), the VGT assembly (3) being disposed within the installation space (11), the VGT assembly (3) dividing the installation space (11) into a first space (111) and a second space (112), the first space (111) being in communication with the air intake (2), a turbine (4) being disposed within the second space (112);

a slow flow gap (5), wherein the slow flow gap (5) is formed between the volute (1) and the VGT assembly (3), an air inlet end (54) of the slow flow gap (5) is communicated with the first space (111), and an air outlet end (55) of the slow flow gap (5) is communicated with the second space (112);

the VGT assembly (3) includes: a rear cover (31), the slow flow gap (5) is formed between the rear cover (31) and the scroll (1), a first channel (51) of the slow flow gap (5) is formed between the end wall of the rear cover (31) and the vertical wall (12), the air inlet end (54) is formed at the outer end of the first channel (51), and the width of the first channel (51) is 0.2-0.4 mm;

a buffer arc wall (14) which is bent in the direction away from the rear cover (31) is connected between the vertical wall (12) and the transverse wall (13), and the radius of a circle where the buffer arc wall (14) is located is greater than or equal to 0.5 mm.

2. The turbocharger (100) of claim 1, wherein the flow-slowing gap (5) further comprises: the sealing structure comprises a second channel (52) and a third channel (53), wherein the second channel (52) is connected between the first channel (51) and the third channel (53), a plurality of mounting grooves (131) are formed in the peripheral surface of the transverse wall (13), a sealing ring (6) is arranged between each mounting groove (131) and the side wall of the rear cover (31), and the second channel (52) is formed between the sealing ring (6) and the mounting grooves (131).

3. The turbocharger (100) according to claim 2, wherein the distance between the side wall of the back cover (31) and the transverse wall (13) is 0.4-0.6 mm.

4. The turbocharger (100) according to claim 2, wherein the distance between the bottom wall of the sealing ring (6) and the bottom wall of the mounting groove (131) is 0.4-0.6 mm.

5. The turbocharger (100) according to claim 2, wherein the distance between the side walls of the two sides of the seal ring (6) and the side walls of the two sides of the mounting groove (131) is 0.04-0.05 mm.

6. The turbocharger (100) according to claim 2, wherein an overlapping dimension of the mounting groove (131) and the seal ring (6) in a radial direction of the volute (1) is 0.4mm or less.

7. The turbocharger (100) of claim 2, wherein there are two mounting grooves (131).

8. The turbocharger (100) according to claim 2, wherein the rear cover (31) has a mounting flange (311), a circular arc transition wall (312) is provided between a side wall of the rear cover (31) and the mounting flange (311), a starting section (531) of the third channel (53) is formed between the circular arc transition wall and a terminal end of the transverse wall (13), an end of the transverse wall (13) far away from the vertical wall (12) is obliquely arranged towards a concave direction of the mounting groove (131) to form an inclined wall (15), an oblique transition section (532) of the third channel (53) is formed between the inclined wall (15) and the side wall of the mounting flange (311), a terminal end of the inclined wall (15) extends away from the vertical wall (12) to form a flat plate (16), and a final section (533) of the third channel (53) is formed between the flat plate (16) and an end wall of the mounting flange (311), the gas outlet end (55) is formed at an end of the end section (533).

9. The turbocharger (100) of claim 8, wherein the angled transition segment (532) tapers in width from the end of the angled transition segment (532) connected to the start segment (531) to the end of the angled transition segment (532) connected to the end segment (533).

10. A vehicle, characterized by comprising a turbocharger (100) according to any one of claims 1-9.