CN114687846A

CN114687846A - Exhaust system and car

Info

Publication number: CN114687846A
Application number: CN202210325038.0A
Authority: CN
Inventors: 王楠; 骆旭薇; 刘勇; 官玉群; 马超; 高维进; 袁晓军; 章国海; 高俊杰
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-01

Abstract

The invention provides an exhaust system and an automobile, wherein the exhaust system comprises a first exhaust manifold, a second exhaust manifold, a supercharger and a connecting device, the first exhaust manifold is communicated with the supercharger, and the second exhaust manifold is communicated with the first exhaust manifold through the connecting device; the first exhaust manifold comprises a first manifold body, a first cylinder exhaust pipe, a second cylinder exhaust pipe and a third cylinder exhaust pipe which are arranged on the first manifold body at intervals, and one end of the first manifold body, which is connected with the supercharger, is provided with a first exhaust port and a second exhaust port which are arranged in a separated mode. The three-cylinder exhaust pipe, the four-cylinder exhaust pipe, the five-cylinder exhaust pipe and the six-cylinder exhaust pipe are communicated with the second exhaust port, so that the gas volume of the second exhaust manifold is increased, the overlarge temperature difference between the two exhaust passages is avoided, and the technical problem that the temperature difference between the two exhaust passages is sharply increased when the waste gas bypass valve of the supercharger is opened in the prior art, so that the heat bearing boundary of the exhaust manifold and the supercharger is easy to change is solved.

Description

Exhaust system and car

Technical Field

The invention relates to the technical field of engine structure design, in particular to an exhaust system and an automobile.

Background

For the current mainstream heavy six-cylinder diesel engine, a symmetrical three-section exhaust manifold structure is generally adopted, namely 1, 2 and 3 cylinders share one section of exhaust passage, and 4, 5 and 6 cylinders share the other section of exhaust passage. The temperature difference between the two sections of exhaust passages can be increased rapidly when the exhaust bypass valve of the supercharger is opened, so that the heat bearing boundary of an exhaust manifold and the supercharger is changed, and the risk of durability failure is high under the condition of inconsistent thermal deformation caused by the temperature difference.

Disclosure of Invention

Based on the above, the invention aims to provide an exhaust system and an automobile, which are used for solving the technical problem that when a supercharger exhaust gas bypass valve is opened, the temperature difference between two sections of exhaust passages is rapidly increased, so that the heat bearing boundary of an exhaust manifold and a supercharger is easy to change in the prior art.

One aspect of the present invention provides an exhaust system, including a first exhaust manifold, a second exhaust manifold, a supercharger, and a connecting device, wherein the first exhaust manifold is communicated with the supercharger, and the second exhaust manifold is communicated with the first exhaust manifold through the connecting device;

the first exhaust manifold comprises a first manifold body, and a first cylinder exhaust pipe, a second cylinder exhaust pipe and a third cylinder exhaust pipe which are arranged on the first manifold body at intervals, wherein one end of the first manifold body, which is connected with the supercharger, is provided with a first exhaust port and a second exhaust port which are arranged in a separated mode, and the first cylinder exhaust pipe and the second cylinder exhaust pipe are communicated with the first exhaust port;

the second exhaust manifold comprises a second manifold body, and a four-cylinder exhaust pipe, a five-cylinder exhaust pipe and a six-cylinder exhaust pipe which are arranged on the second manifold body at intervals, wherein the three-cylinder exhaust pipe, the four-cylinder exhaust pipe, the five-cylinder exhaust pipe and the six-cylinder exhaust pipe are communicated with the second exhaust port;

the supercharger comprises a volute, a turbine pipeline and a bypass valve, the turbine pipeline is integrally connected with the volute, a first air passage and a second air passage are arranged inside the turbine pipeline in a separated mode, the first air passage corresponds to the first exhaust port, the second air passage corresponds to the second exhaust port, the bypass valve is arranged on the volute, and the bypass valve is used for controlling gas emission in the second air passage.

According to the exhaust system, the first exhaust port is communicated with the second exhaust port through the first exhaust pipe and the second exhaust pipe, the third exhaust pipe, the fourth exhaust pipe, the fifth exhaust pipe and the sixth exhaust pipe are communicated with the second exhaust port, so that the gas volume of the second exhaust manifold is increased, the temperature drop in the second exhaust manifold and the second air passage is effectively reduced, the overlarge temperature difference between the two exhaust passages is avoided, and the technical problem that when a waste gas bypass valve of a supercharger is opened in a six-cylinder diesel engine in the prior art, the temperature difference between the two exhaust passages can be sharply increased, and the heat bearing boundary between the exhaust manifold and the supercharger is easy to change is solved.

Further, in the exhaust system, one end of the first manifold body facing the second manifold body is provided with a first connecting end, the second manifold body is provided with a second connecting end corresponding to the first connecting end, the connecting device includes a first flange and a second flange, the first flange is arranged on an outer wall of the first connecting end, the second flange is arranged on an outer wall of the second connecting end, and the first flange and the second flange are detachably and fixedly connected with each other.

Further, exhaust system, wherein, first ring flange with install detachable connecting piece between the second ring flange, the connecting piece includes fixing bolt and spring, fixing bolt's screw rod respectively the activity run through in first ring flange with the second ring flange, just the spring housing is located fixing bolt's screw rod is outside.

Further, in the exhaust system, a sealing gasket is arranged between the first flange and the second flange.

Further, in the exhaust system, an end surface of the second connection end portion extends outwards to form a guide pipe, and the guide pipe can be inserted into the first connection end portion.

Further, the exhaust system, wherein, the outer wall cover of stand pipe is equipped with sealed lasso.

Further, the exhaust system, wherein, the second manifold body is equipped with EGR gas intaking pipe away from the one end of second connection end portion.

Further, the exhaust system, wherein a valve port for pressure relief of the second air passage is arranged on an inner wall of the volute, the bypass valve includes a valve assembly and an adjusting assembly, the valve assembly includes a rotating shaft and a valve plate, the valve plate is rotatably arranged on one side of the valve port through the rotating shaft, the valve plate can be used for sealing the valve port, the adjusting assembly includes an actuator, a valve rod and a pull piece, one end of the valve rod is movably connected with the rotating shaft through the pull piece, the other end of the valve rod is connected with the actuator, and the actuator is used for driving the valve rod to make reciprocating linear motion.

Further, exhaust system, wherein, the valve rod includes mobile jib and adjusting collar, the one end of mobile jib is connected executor, the other end are equipped with the external screw thread, adjusting collar's one end is equipped with the internal thread, the other end passes through pulling-on piece swing joint the pivot, the external screw thread with can mutually support the locking between the internal thread.

The invention further provides an automobile comprising the exhaust system in the technical scheme.

Drawings

FIG. 1 is a perspective view of an exhaust system according to the present invention;

FIG. 2 is an exploded view of the exhaust system of the present invention;

FIG. 3 is a schematic view showing a detailed structure of the supercharger of the present invention;

FIG. 4 is an enlarged view of a portion of the location A of FIG. 1;

FIG. 5 is a schematic view showing a specific structure of the bypass valve according to the present invention;

FIG. 6 is an exploded view of the valve stem of the present invention;

FIG. 7 is a temperature differential comparison of a conventional exhaust system and an exhaust system of the present invention;

description of the main element symbols:

the following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for purposes of illustration only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 7, an exhaust system according to a first embodiment of the present invention is shown, including a first exhaust manifold 10, a second exhaust manifold 20, a supercharger 30 and a connecting device, wherein the first exhaust manifold 10 is communicated with the supercharger 30, and the second exhaust manifold 20 is communicated with the first exhaust manifold 10 through the connecting device;

the first exhaust manifold 10 comprises a first manifold body 11, and a first cylinder exhaust pipe 12, a second cylinder exhaust pipe 13 and a third cylinder exhaust pipe 14 which are arranged on the first manifold body 11 at intervals, wherein one end of the first manifold body 11 connected with the supercharger 30 is provided with a first exhaust port 15 and a second exhaust port 16 which are arranged at intervals, and the first cylinder exhaust pipe 12 and the second cylinder exhaust pipe 13 are communicated with the first exhaust port 15;

the second exhaust manifold 20 comprises a second manifold body 21, and four-cylinder exhaust pipes 22, five-cylinder exhaust pipes 23 and six-cylinder exhaust pipes 24 which are arranged on the second manifold body 21 at intervals, wherein the three-cylinder exhaust pipe 14, the four-cylinder exhaust pipe 22, the five-cylinder exhaust pipe 23 and the six-cylinder exhaust pipe 24 are communicated with the second exhaust port 16;

the supercharger 30 includes a volute 31, a turbine pipeline 32 and a bypass valve 35, the turbine pipeline 32 is integrally connected to the volute 31, a first air passage 33 and a second air passage 34 are partitioned inside the turbine pipeline 32, the first air passage 33 corresponds to the first exhaust port 15, the second air passage 34 corresponds to the second exhaust port 16, the bypass valve 35 is disposed on the volute 31, and the bypass valve 35 is used for controlling gas discharge in the second air passage 34.

It should be explained that, according to the krabberon equation PV ═ nRT, in a state where the basic assumption of ideal gas is not true in actual gas, and in a state where gas n is constant with P, V is proportional to T, the exhaust temperature variation during quantitative gas loss will be higher, bringing the risks of thermal deformation and cracking endurance of the exhaust manifold and the supercharger 30, therefore V is proportional to T in a state where gas n is constant with P, i.e. increasing the gas volume can effectively reduce the temperature drop, wherein:

p is gas pressure in Pa;

v is the gas volume in m 3;

n is the amount of gaseous material in mol units;

t is the system temperature and the single ideal gas state equation position K;

r is a proportionality coefficient, and the numerical values are all different under different conditions, and the unit is J/(mol.K).

It can be understood that the second air passage 34 provided with the bypass valve 35 is communicated with the three-cylinder exhaust pipe 14, the four-cylinder exhaust pipe 22, the five-cylinder exhaust pipe 23 and the six-cylinder exhaust pipe 24, so that the gas volume of the second exhaust manifold 20 is increased, the temperature drop in the second exhaust manifold 20 and the second air passage 34 is effectively reduced, and the excessive temperature difference between the two exhaust passages is avoided.

Specifically, referring to fig. 7, a temperature difference comparison between a conventional exhaust system and an exhaust system of the present invention is shown. The design temperature difference of the original exhaust system is 151 ℃ at most, the design temperature difference of the exhaust system adopting the method is 52 ℃, and the structure successfully passes a 2500hr simulation customer working condition endurance test and a 400hr exhaust manifold cracking test.

Specifically, a first connecting end 41 is arranged at one end of the first manifold body 11 facing the second manifold body 21, a second connecting end 42 corresponding to the first connecting end 41 is arranged on the second manifold body 21, the connecting device includes a first flange 43 and a second flange 44, the first flange 43 is arranged on the outer wall of the first connecting end 41, the second flange 44 is arranged on the outer wall of the second connecting end 42, and the first flange 43 and the second flange 44 can be mutually detached and fixedly connected.

Further, an EGR gas taking pipe 60 is provided at an end of the second manifold body 21 away from the second connecting end portion 42, and the EGR gas taking pipe 60 communicates with the second gas passage 34.

In this embodiment, set up EGR gas-taking pipe 60 on second manifold body 21, also communicate second air flue 34 with EGR gas-taking pipe 60 to increase the exhaust volume when exhaust gas circulates, avoid the exhaust flow volume insufficient to lead to the pressure differential between exhaust manifold and the intake manifold to be lower, can't realize among the exhaust gas recirculation system gas flow drive, cause the former quick-witted emission of NOx to be difficult to control.

Further, a sealing gasket (not shown) is disposed between the first flange 43 and the second flange 44. To ensure an airtight connection between the first manifold body 11 and the second manifold body 21, avoiding gas leakage.

Specifically, a detachable connecting piece is installed between the first flange plate 43 and the second flange plate 44, the connecting piece includes a fixing bolt 45 and a spring 46, a screw of the fixing bolt 45 respectively and movably penetrates through the first flange plate 43 and the second flange plate 44, and the spring 46 is sleeved outside the screw of the fixing bolt 45. Wherein, the spring 46 applies elastic force to the first flange 43 and the second flange 44, so that the first flange 43, the second flange 44 and the sealing washer are tightly installed therebetween.

In this embodiment, at least four sets of connecting members are provided, and the connecting members of the sets are distributed between the first flange 43 and the second flange 44 in a central symmetry manner; the plurality of sets of connecting members are used for stably and fixedly mounting the first flange 43 and the second flange 44.

In this embodiment, the end surface of the second connecting end 42 extends outward to form a guiding tube 50, the guiding tube 50 can be inserted into the first connecting end 41 until the first flange 43 and the second flange 44 are attached to each other, and the guiding tube 50 is disposed to facilitate the butt-joint installation of the first manifold body 11 and the second manifold body 21.

Further, a sealing collar (not shown) is sleeved on the outer wall of the guide tube 50. The outer wall of the sealing ring is attached to the inner wall of the first connecting end 41; the sealing collar enables a better sealing fit between the guide tube 50 and the first connection end 41.

Specifically, a valve port 351 for releasing pressure of the second air passage 34 is disposed on an inner wall of the volute 31, the bypass valve 35 includes a valve assembly and an adjusting assembly, the valve assembly includes a rotating shaft 352 and a valve plate 353, the valve plate 353 is rotatably disposed on one side of the valve port 351 through the rotating shaft 352, the valve plate 353 can be used for blocking the valve port 351, the adjusting assembly includes an actuator 354, a valve rod 355 and a pull tab 356, one end of the valve rod 355 is movably connected to the rotating shaft 352 through the pull tab 356, the other end of the valve rod 355 is connected to the actuator 354, the pull tab 356 is fixedly connected to the rotating shaft 352, the pull tab 356 is rotatably connected to an end of the valve rod 355, and the actuator 354 is used for driving the valve rod 355 to perform reciprocating linear motion. In practical applications, when the pressure of the supercharger 30 exceeds a threshold value, the actuator 354 drives the valve rod 355 to extend and rotate the rotating shaft 352 through the pull tab 356, such that the valve plate 353 disposed on the rotating shaft 352 is away from the valve port 351 and no longer seals the valve port 351, and at this time, the exhaust gas can be discharged from the valve port 351 without passing through the turbine, thereby ensuring the normal operation of the supercharger 30.

In this embodiment, the valve rod 355 includes a main rod 3552 and an adjusting sleeve 3551, one end of the main rod 3552 is connected to the actuator 354, the other end of the main rod 3552 is provided with an external thread, one end of the adjusting sleeve 3551 is provided with an internal thread, the other end of the adjusting sleeve 3551 is movably connected to the rotating shaft 352 through a pull tab 356, and the external thread and the internal thread can be mutually matched and locked. It can be understood that, compared to the conventional non-adjustable valve rod 355 structure design, the valve rod 355 in this embodiment can satisfy the requirement of setting the opening amount of the valve plate 353 without repeatedly replacing the valve rod 355 with different lengths, an operator can rotate the main rod 3552 to adjust the total length of the valve rod 355 so as to control the opening amount of the valve plate 353.

In summary, in the exhaust system according to the above embodiment of the present invention, the first exhaust port 15 is communicated with the first cylinder exhaust pipe 12 and the second exhaust port 13, and the third exhaust pipe 14, the fourth exhaust pipe 22, the fifth exhaust pipe 23, and the sixth exhaust pipe 24 are communicated with the second exhaust port 16, so that the gas volume of the second exhaust manifold 20 is increased, thereby effectively reducing the temperature drop in the second exhaust manifold 20 and the second gas passage 34, avoiding the excessive temperature difference between the two exhaust pipes, and solving the technical problem that when the waste gate valve 35 of the supercharger 30 is opened in the prior art, the temperature difference between the two exhaust pipes is sharply increased, which leads to the easy change of the heat-bearing boundary between the exhaust manifold and the supercharger 30.

The second embodiment of the invention also provides an automobile which comprises the exhaust system in the technical scheme.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An exhaust system is characterized by comprising a first exhaust manifold, a second exhaust manifold, a supercharger and a connecting device, wherein the first exhaust manifold is communicated with the supercharger, and the second exhaust manifold is communicated with the first exhaust manifold through the connecting device;

2. The exhaust system according to claim 1, wherein the first manifold body has a first connecting end portion at an end facing the second manifold body, the second manifold body has a second connecting end portion corresponding to the first connecting end portion, the connecting device includes a first flange and a second flange, the first flange is disposed on an outer wall of the first connecting end portion, the second flange is disposed on an outer wall of the second connecting end portion, and the first flange and the second flange are detachably and fixedly connected to each other.

3. The exhaust system according to claim 2, wherein a detachable connecting member is installed between the first flange plate and the second flange plate, the connecting member includes a fixing bolt and a spring, a screw of the fixing bolt is movably inserted through the first flange plate and the second flange plate, and the spring is sleeved outside the screw of the fixing bolt.

4. An exhaust system according to claim 2, wherein a sealing gasket is disposed between the first flange and the second flange.

5. An exhaust system according to claim 2, wherein the end face of the second connection end portion extends outwardly to form a guide tube which is insertable into the first connection end portion.

6. An exhaust system according to claim 5, wherein the outer wall of the guide tube is fitted with a sealing collar.

7. An exhaust system according to claim 2, wherein an end of the second manifold body remote from the second connection end is provided with an EGR take-off pipe.

8. The exhaust system according to claim 1, wherein a valve port for pressure relief of the second air passage is formed in an inner wall of the volute, the bypass valve includes a valve assembly and an adjusting assembly, the valve assembly includes a rotating shaft and a valve plate, the valve plate is rotatably disposed on one side of the valve port through the rotating shaft, the valve plate is configured to close the valve port, the adjusting assembly includes an actuator, a valve rod and a pull-tab, one end of the valve rod is movably connected to the rotating shaft through the pull-tab, the other end of the valve rod is connected to the actuator, and the actuator is configured to actuate the valve rod to perform a reciprocating linear motion.

9. The exhaust system of claim 8, wherein the valve rod comprises a main rod and an adjusting sleeve, one end of the main rod is connected with the actuator, the other end of the main rod is provided with an external thread, one end of the adjusting sleeve is provided with an internal thread, the other end of the adjusting sleeve is movably connected with the rotating shaft through the pull piece, and the external thread and the internal thread can be matched and locked with each other.

10. An automobile, characterized by comprising an exhaust system according to any one of the preceding claims 1-9.