Circulating exhaust gas mixing device and diesel engine

Abstract

The present invention discloses a circulating exhaust gas mixing device, including a shell, a partition is arranged inside the shell, the partition divides the inner cavity of the shell into a mixing chamber and a pressure stabilizing chamber, and a through hole is arranged on the partition; a circulating exhaust gas pipe and an air pipe are arranged in the mixing chamber, both of which are straight pipes, and a plurality of circulating exhaust gas outlet holes are arranged on the circulating exhaust gas pipe, and a plurality of air outlet holes are arranged on the air pipe. In the mixing chamber, the circulating exhaust gas is dispersed from the circulating exhaust gas outlet hole. Due to the blocking effect of the partition, the mixed gas will generate pressure accumulation in the mixing chamber, which is conducive to uniform mixing. In addition, when the circulating exhaust gas intake is large, its flow rate is large enough, so the uniformity of mixing can be ensured. At this time, the flow area of ​​the circulating exhaust gas outlet hole is increased to reduce the pump pressure loss; when the circulating exhaust gas intake is small, the flow area of ​​the circulating exhaust gas outlet hole is reduced to increase the flow rate of the circulating exhaust gas, thereby improving the uniformity of mixing. The present invention also discloses a diesel engine.

Description

Technical Field

[0001] The invention relates to the field of circulating exhaust gas of diesel engines, and more specifically to a circulating exhaust gas mixing device and a diesel engine. Background Art

[0002] In the process of recycling the recycled exhaust gas, the recycled exhaust gas and fresh air are first mixed, and then the mixed gas is allowed to enter each cylinder of the diesel engine. In order to make the recycled exhaust gas and fresh air mix evenly, those skilled in the art set a more complex cavity structure in the mixing chamber, or set a more complex nozzle structure on the recycled exhaust gas pipeline. Although the above method can improve the uniformity of mixing, it will cause a large pumping loss of the system.

[0003] Therefore, how to minimize the system's pumping loss while ensuring the uniformity of the mixed gas is a key issue that needs to be urgently resolved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide a circulating exhaust gas mixing device, which can not only ensure uniform mixing of the mixed gas, but also reduce the pumping loss of the system. To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A circulating exhaust gas mixing device comprises a shell, wherein a partition is arranged inside the shell, wherein the partition divides the inner cavity of the shell into a mixing cavity and a pressure stabilizing cavity, and wherein a through hole for connecting the mixing cavity and the pressure stabilizing cavity is arranged on the partition;

[0006] A circulating exhaust gas pipe and an air pipe are arranged in the mixing chamber. Both the circulating exhaust gas pipe and the air pipe are straight pipes. A plurality of circulating exhaust gas outlet holes are arranged on the circulating exhaust gas pipe. A plurality of air outlet holes are arranged on the air pipe. The pressure stabilizing chamber is connected to the cylinder.

[0007] Preferably, a plurality of the through holes are evenly distributed on the partition.

[0008] Preferably, the mixing chamber is a rectangular parallelepiped chamber, the cross section of the partition is a rectangle, and the contour edge of the partition is sequentially connected to the inner wall of the shell at the partition.

[0009] Preferably, the circulating exhaust gas pipe and the air pipe are arranged in parallel, and one of them is closer to the partition plate than the other.

[0010] Preferably, two opposite slots are provided on the inner wall of the shell, and the openings of the two slots are opposite to each other, and the two wide sides of the partition are respectively inserted into the two slots.

[0011] Preferably, a convex cavity protruding outward is formed on the side plate in contact with one long side of the partition, the convex cavity is connected to the pressure-stabilizing chamber, and a flange is provided at the end of the convex cavity, and the flange is connected to the cylinder.

[0012] Preferably, the side plate in contact with the other long side of the partition is fixed by welding.

[0013] Preferably, it further comprises a circulating exhaust gas connector and an air connector arranged on the side of the shell, the circulating exhaust gas pipe is communicated with the circulating exhaust gas connector, and the air pipe is communicated with the air connector.

[0014] Preferably, the circulating exhaust gas pipe is a sleeve-type structure, including an outer sleeve and an inner sleeve, the circulating exhaust gas enters the inner sleeve, the outer sleeve is fixed relative to the shell, the ends of the outer sleeve and the inner sleeve are both blind ends, and a compression spring is provided between the blind end of the outer sleeve and the blind end of the inner sleeve.

[0015] The inner sleeve is provided with inner large holes and small holes at intervals along its axial direction, and the outer sleeve is provided with multiple outer large holes along its axial direction. When the intake amount of the circulating exhaust gas is small, the small holes on the inner sleeve are aligned with the outer large holes on the outer sleeve. When the intake amount of the circulating exhaust gas increases, the inner sleeve compresses the compression spring, and the inner large holes on the inner sleeve are gradually aligned with the outer large holes on the outer sleeve.

[0016] Preferably, the inner sleeve is provided with a circle of inner large holes and a circle of small holes at intervals along its axial direction, and the outer sleeve is provided with multiple circles of outer large holes along its axial direction.

[0017] Preferably, the outer large hole and the inner large hole are both strip-shaped holes, and the small hole is a circular hole.

[0018] Preferably, it also includes a clamping ring, which is subjected to the extrusion force of the circulating exhaust gas connector and applies the extrusion force to the end faces of the outer sleeve and the starting ends of the inner sleeve. The outer sleeve is pressed against the shell, and the inner sleeve squeezes the compression spring. The circulating exhaust gas connector is connected to the shell and communicates with the inner sleeve.

[0019] Preferably, the circulating exhaust gas connector has a first flange, the housing has a second flange used in conjunction with the first flange, the clamping ring is located in the center hole of the second flange, and the end face of the first flange is used to squeeze the clamping ring.

[0020] Preferably, a pipe head is further provided at the starting end of the inner sleeve, a pipe shoulder is formed between the pipe head and the end face of the starting end of the inner sleeve, the clamping ring squeezes the inner sleeve through the pipe shoulder, and the pipe head extends into the inner cavity of the circulating exhaust gas connector.

[0021] Preferably, one of the inner sleeve and the outer sleeve is provided with a protrusion, and the other is provided with a groove matched with the protrusion, and the groove extends along the axial direction of the inner sleeve or the outer sleeve.

[0022] The present invention also provides a diesel engine, comprising a circulating exhaust gas mixing device, wherein the circulating exhaust gas mixing device is any one of the above-mentioned circulating exhaust gas mixing devices.

[0023] It can be seen from the above technical solution that the partition divides the inner cavity of the shell into a mixing chamber and a pressure-stabilizing chamber. In the mixing chamber, the circulating exhaust gas is released from the circulating exhaust gas outlet hole on the circulating exhaust gas pipe, and the fresh air is released from the air outlet hole on the air pipe. Due to the blocking effect of the partition, the mixed gas will generate pressure accumulation in the mixing chamber, which is conducive to the uniform mixing of the mixed gas. In addition, the flow area of ​​the circulating exhaust gas outlet hole can also be set to be adjustable: when the circulating exhaust gas intake volume is large, the flow area of ​​the circulating exhaust gas outlet hole is increased to reduce the interception loss, thereby reducing the pump pressure loss; when the circulating exhaust gas intake volume is small, the flow area of ​​the circulating exhaust gas outlet hole is reduced to increase the flow rate of the circulating exhaust gas, which is conducive to uniform mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the scheme in the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A cross-sectional view of a circulating exhaust gas mixing device provided in a specific embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a circulating exhaust gas mixing device provided in a specific embodiment of the present invention;

[0027] Figure 3 Another cross-sectional view of a circulating exhaust gas mixing device provided in a specific embodiment of the present invention;

[0028] Figure 4 for Figure 2 A structural diagram from another angle;

[0029] Figure 5 A schematic diagram of the coordination of the outer sleeve and the inner sleeve when the circulating exhaust gas flow rate is relatively large provided by a specific embodiment of the present invention;

[0030] Figure 6 A schematic diagram of the coordination of the outer sleeve and the inner sleeve when the circulating exhaust gas flow rate is small provided by a specific embodiment of the present invention;

[0031] Figure 7 A schematic structural diagram of an inner sleeve and an outer sleeve being compressed by a compression ring provided in a specific embodiment of the present invention.

[0032] Among them, 1 is the inner sleeve, 2 is the air pipe, 3 is the partition, 4 is the circulating exhaust gas connector, 5 is the air connector, 6 is the shell, 7 is the flange, 8 is the side plate, 9 is the compression spring, 10 is the pipe head, 11 is the outer sleeve, 12 is the inner large hole, 13 is the outer large hole, 14 is the small hole, and 15 is the clamping ring. DETAILED DESCRIPTION

[0033] The invention discloses a circulating exhaust gas mixing device, which can ensure uniform mixing of mixed gas and reduce the pumping gas loss of the system.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In a specific embodiment of the present invention, the circulating exhaust gas mixing device includes a housing 6, a partition 3, a circulating exhaust gas pipe, and an air pipe 2. The partition 3 divides the inner cavity of the housing 6 into a mixing cavity and a pressure stabilizing cavity. A through hole is provided on the partition 3, and the through hole is used to connect the mixing cavity and the pressure stabilizing cavity.

[0036] A circulating exhaust gas pipe and an air pipe 2 are provided in the mixing chamber. The circulating exhaust gas pipe is provided with a plurality of circulating exhaust gas outlet holes. The air pipe 2 is provided with a plurality of air outlet holes. In order to improve the uniformity of mixing, the plurality of circulating exhaust gas outlet holes may be evenly distributed on the circulating exhaust gas pipe, and the plurality of air outlet holes may be evenly distributed on the air pipe 2.

[0037] In the mixing chamber, the circulating exhaust gas is released from the circulating exhaust gas outlet hole on the circulating exhaust gas pipe, and the fresh air is released from the air outlet hole on the air pipe. Due to the blocking effect of the partition, the mixed gas will accumulate pressure in the mixing chamber, which is conducive to the uniformity of the mixed gas. After being fully mixed in the mixing chamber, the mixed gas will enter the pressure stabilizing chamber through the through hole on the partition, and then enter each cylinder.

[0038] Furthermore, the circulating exhaust gas pipe and the air pipe 2 are both straight pipes. The straight pipe-shaped circulating exhaust gas pipe and the air pipe 2 have a simpler structure, so the circulating exhaust gas and the fresh air have less resistance when they are respectively released from the circulating exhaust gas outlet and the air outlet, thereby reducing the loss of pump pressure.

[0039] In summary, the evenly distributed circulating exhaust gas outlet holes and air outlet holes and the relatively closed mixing chamber can ensure the uniform mixing of the circulating exhaust gas and the fresh air. The straight pipe-shaped circulating exhaust gas pipe and the air pipe 2 can significantly reduce the pump pressure loss. Therefore, the circulating exhaust gas mixing device in the present invention can not only ensure the uniform mixing of the mixed gas, but also reduce the pump gas loss of the system.

[0040] In the prior art, the fresh air and the circulating exhaust gas flowing out of the air pipe 2 and the circulating exhaust gas pipe are mixed in the mixing chamber and then enter the intake pipe, and then enter each cylinder. However, the air inlet of the intake pipe is usually arranged at one end of the intake pipe or in the middle of the intake pipe, so that the mixed gas entering the intake pipe will have a bias, which will eventually lead to an uneven amount of gas entering each cylinder. In addition, the mixing chamber in the prior art is usually provided with a right-angle structure, and the mixed gas will be deflected when passing through the right-angle structure. The concentration of the mixed gas is higher near the inner right angle, and the concentration of the mixed gas is lower near the outer right angle, which will aggravate the bias of the mixed gas in the intake pipe. The pressure stabilizing chamber in the present invention is connected to each cylinder. The present invention evenly distributes a plurality of through holes on the partition 3, instead of setting an air inlet at a certain position of the intake pipe as in the prior art. In addition, the mixed gas in the present invention is evenly mixed in the mixing chamber. Therefore, the mixed gas in the present invention can enter the pressure stabilizing chamber evenly in the length direction of the partition 3, so that the amount of mixed gas at each position of the pressure stabilizing chamber is equal, thereby significantly reducing the bias of the mixed gas, and ultimately ensuring that the amount of gas entering each cylinder is basically equal.

[0041] Furthermore, the mixing chamber is set as a rectangular chamber, and correspondingly, the cross section of the partition 3 is rectangular. Such a setting can simplify the structure and facilitate production. In addition, the edge portion defining the contour of the partition 3 is sequentially connected to the inner wall of the shell 6 at the partition 3. Such a setting can improve the sealing of the mixing chamber, thereby facilitating the generation of pressure accumulation of the mixed gas in the mixing chamber.

[0042] Furthermore, the circulating exhaust gas pipe and the air pipe 2 are arranged in parallel, and one of them is closer to the partition 3 than the other. Figure 1 As shown, the circulating exhaust gas pipe is located above the air pipe 2. Such an arrangement can make the structure of the circulating exhaust gas mixing device more compact.

[0043] During the production process, in order to facilitate the installation and positioning of the partition 3, a slot can be pre-arranged on the inner wall of the shell 6. The two slots are arranged opposite to each other, and the openings of the slots are opposite to each other. The two wide sides of the partition 3 can be inserted into the two slots from above.

[0044] The partition 3 has two long sides. The two long sides are in contact with two side plates respectively. A convex cavity protruding outward is formed on the side plate in contact with one long side of the partition 3, and the convex cavity is connected to the pressure stabilizing chamber. The port of the convex cavity is provided with a flange 7, and a bolt hole is provided on the flange 7. A matching hole matching with the bolt hole is provided at the air intake port of the cylinder. The bolt passes through the bolt hole and the matching hole to realize the connection between the circulating exhaust gas mixing device and the cylinder.

[0045] Furthermore, the side plate 8 in contact with the other long side of the partition plate 3 is fixed to the main body of the shell 6 by welding. Welding can ensure the sealing performance of the shell 6.

[0046] Further, for ease of use, a circulating exhaust gas connector 4 and an air connector 5 are provided on the side of the housing 6. The circulating exhaust gas pipe is communicated with the circulating exhaust gas connector 4, and the air connector 5 is communicated with the air pipe 2.

[0047] In a specific embodiment of the present invention, the circulating exhaust gas pipe is configured as a sleeve-type structure. The circulating exhaust gas pipe includes an outer sleeve 11 and an inner sleeve 1. The inner sleeve 1 is arranged inside the outer sleeve 11. The circulating exhaust gas enters the inner sleeve 1. The outer sleeve 11 is fixed relative to the shell 6. The ends of the outer sleeve 11 and the inner sleeve 1 are both blind ends. The end of the outer sleeve 11 is the end of the outer sleeve 11 away from the circulating exhaust gas connector 4. The end of the inner sleeve 1 is the end of the inner sleeve 1 away from the circulating exhaust gas connector 4. A compression spring 9 is arranged between the blind end of the outer sleeve 11 and the blind end of the inner sleeve 1. The compression spring 9 is squeezed by the blind end of the inner sleeve 1 and the blind end of the outer sleeve 11.

[0048] In addition, inner large holes 12 and small holes 14 are arranged at intervals along the axial direction of the inner sleeve 1. That is, along the axial direction of the inner sleeve 1, inner large holes 12, small holes 14, inner large holes 12, small holes 14, etc. are arranged in sequence. Multiple outer large holes 13 are arranged along the axial direction on the outer sleeve 11. When the intake volume of the circulating exhaust gas is small, please refer to the attached Figure 6 , the small hole 14 on the inner sleeve 1 is aligned with the outer large hole 13 on the outer sleeve 11. That is, at this time, the small hole 14 and the outer large hole 13 form a circulating exhaust gas outlet. At this time, the flow area of ​​the circulating exhaust gas outlet is small, thereby forcing the flow rate of the circulating exhaust gas to increase, so as to facilitate uniform mixing with fresh air.

[0049] When the intake volume of circulating exhaust gas is large, please refer to the attached Figure 7, the circulating exhaust gas intake pressure in the inner sleeve 1 is relatively large, and the circulating exhaust gas intake pressure will act on the blind end of the inner sleeve 1, causing the inner sleeve 1 to squeeze the compression spring 9, and then the inner sleeve 1 will move axially relative to the outer sleeve 11. During the movement, the inner large hole 12 on the inner sleeve 1 and the outer large hole 13 on the outer sleeve 11 are gradually aligned, and after the inner large hole 12 and the outer large hole 13 are aligned, the inner sleeve 1 no longer moves. Then the inner large hole 12 and the outer large hole 13 form a circulating exhaust gas outlet hole, and the flow area of ​​the circulating exhaust gas outlet hole is relatively large at this time. That is, when the intake volume of the circulating exhaust gas is large, the flow area of ​​the circulating exhaust gas outlet hole becomes larger, which is beneficial to the discharge of the circulating exhaust gas and reduces the pump pressure loss.

[0050] Furthermore, both the outer large hole 13 and the inner large hole 12 are set as strip holes. The strip hole extends along the axial direction of the outer sleeve 11 or the inner sleeve 1. The small hole 14 on the inner sleeve 1 is set as a small circular hole. That is, when the flow rate of the circulating exhaust gas is small, the circular hole on the inner sleeve 1 is aligned with the strip hole on the outer sleeve 11 to form a circulating exhaust gas outlet with a smaller flow area. When the flow rate of the circulating exhaust gas is large, the strip hole on the inner sleeve 1 is aligned with the strip hole on the outer sleeve 11 to form a circulating exhaust gas outlet with a larger flow area.

[0051] Furthermore, it also includes a clamping ring 15. The clamping ring 15 is subjected to the extrusion force of the circulating exhaust gas connector 4, and then the clamping ring 15 applies the extrusion force to the end faces of the outer sleeve 11 and the starting end of the inner sleeve 1. The starting end of the outer sleeve 11 is the end of the outer sleeve 11 away from the blind end of the outer sleeve 11. The starting end of the inner sleeve 1 is the end of the inner sleeve 1 away from the blind end of the inner sleeve 1. The outer sleeve 11 is clamped on the shell by the clamping ring 15. After being squeezed by the clamping ring 15, the inner sleeve 1 compresses the compression spring 9, thereby generating a pre-tightening force to ensure that the subsequent inner sleeve 1 can smoothly compress the compression spring 9. In addition, the circulating exhaust gas connector 4 is connected to the shell 6, and the circulating exhaust gas connector 4 is connected to the inner sleeve 1. That is, the circulating exhaust gas enters the inner sleeve 1 after passing through the circulating exhaust gas connector 4.

[0052] Furthermore, in order to ensure the stability of the compression spring 9, an inner convex portion is provided on the blind end of the inner sleeve 1, and an outer convex portion is provided on the blind end of the outer sleeve 11. Both ends of the compression spring 9 are sleeved on the inner convex portion and the outer convex portion, so as to facilitate the compression spring 9 to be stably compressed along the axial direction.

[0053] Furthermore, the connection method of the circulating exhaust gas connector 4 and the housing 6 is as follows: a first flange (not shown in the figure) is provided on the circulating exhaust gas connector 4, and a second flange is provided on the housing 6. The first flange matches the second flange. The locking bolts lock the first flange and the second flange, so that the connection of the circulating exhaust gas connector 4 and the housing 6 can be achieved. The clamping ring 15 is located in the middle hole of the second flange, and the end surface of the first flange is used to squeeze the clamping ring 15.

[0054] Furthermore, a pipe head 10 is provided at the beginning of the inner sleeve 1, and the diameter of the pipe head 10 is smaller than the diameter of the inner sleeve 1. A pipe shoulder (not shown in the figure) is formed between the pipe head 10 and the end face of the beginning of the inner sleeve 1. A part of the clamping ring 15 acts on the pipe shoulder. That is, the clamping ring 15 squeezes the inner sleeve 1 through the pipe shoulder. The provision of the pipe shoulder increases the contact area between the clamping ring 15 and the inner sleeve 1. In addition, the pipe head 10 extends into the inner cavity of the circulating exhaust gas connector 4.

[0055] Further, a circle of inner large holes 12 and a circle of small holes 14 are arranged at intervals along the axial direction of the inner sleeve 1 on the inner sleeve 1. That is, a circle of inner large holes 12, a circle of small holes 14, a circle of inner large holes 12, a circle of small holes 14, and so on are arranged on the inner sleeve 1. Correspondingly, a plurality of circles of outer large holes 13 are arranged along the axial direction of the outer sleeve 11 on the outer sleeve 11. The number of each circle of inner large holes 12, the number of each circle of small holes 14, and the number of each circle of outer large holes 13 are all equal. That is, along the circumferential direction, each inner large hole 12, each small hole 14, and each outer large hole 13 correspond to each other.

[0056] In order to prevent the inner sleeve 1 from rotating circumferentially relative to the outer sleeve 11, in a specific embodiment of the present invention, a protrusion (not shown in the figure) is provided on one of the outer sleeve 11 and the inner sleeve 1, and a groove (not shown in the figure) matching with the protrusion is provided on the other. And the groove extends along the axial direction of the inner sleeve 1 or the outer sleeve 11. That is, the inner sleeve 1 can move axially relative to the outer sleeve 11, but cannot rotate circumferentially relative to the outer sleeve 11. Specifically, the protrusion can be provided on the outer wall of the inner sleeve 1, and the groove can be provided on the inner wall of the outer sleeve 11.

[0057] During the installation of the circulating exhaust gas pipe, the compression spring 9 is placed at the blind end of the outer sleeve 11, and the inner sleeve 1 is inserted into the inner sleeve 1, so that the blind end of the inner sleeve 1 squeezes the compression spring 9, and the protrusion on the inner sleeve 1 fits into the groove of the outer sleeve 11, and then the clamping ring 15 is sleeved on the end face of the beginning of the outer sleeve 11, and then the outer sleeve 11 and the inner sleeve 1 are inserted into the shell 6, and then the end face of the first flange of the circulating exhaust gas connector 4 is fitted on the end face of the second flange of the shell 6, and the first flange squeezes the clamping ring 15. Finally, the first flange and the second flange are locked by bolts, and the small hole 14 on the inner sleeve 1 is aligned with the outer large hole 13 on the outer sleeve 11.

[0058] It should be noted that when designing the axial distance between the inner large hole 12 and the small hole 14, it is necessary to ensure that the inner large hole 12 has overlapped with the outer large hole 13 before the small hole 14 is completely offset from the outer large hole 13. Similarly, it is also necessary to ensure that the small hole 14 has overlapped with the outer large hole 13 before the inner large hole 12 is completely offset from the outer large hole 13. In this way, the blockage of the circulating exhaust gas outlet hole can be avoided during the axial movement of the inner sleeve 1.

[0059] During the installation of the air pipe 2, a third flange is welded on the air joint 5, and a fourth flange matching the third flange is provided on the housing 6. The air joint 5 is welded on the air pipe 2. Then, the end of the air pipe 2 away from the air joint 5 is inserted into the housing 6, and then the air pipe 2 is moved into the housing 6 until the third flange on the air joint 5 contacts the fourth flange on the housing 6, and then the third flange and the fourth flange are fastened by bolts.

[0060] It should be noted that in order to reduce the difficulty of processing, the length of the air pipe 2 is designed to be smaller than the length of the shell 6. This can avoid the problem that the end of the air pipe 2 hits the inner wall of the shell 6 and the third flange on the air connector 5 cannot contact the fourth flange.

[0061] In summary, the flow paths of the circulating exhaust gas and the fresh air are as follows: the circulating exhaust gas enters the inner sleeve 1 through the circulating exhaust gas connector 4. If the intake volume of the circulating exhaust gas is small, the circulating exhaust gas in the inner sleeve 1 will flow out through the small hole 14 on the inner sleeve 1 and the outer large hole 13 on the outer sleeve 11; if the intake volume of the circulating exhaust gas is large, the circulating exhaust gas in the inner sleeve 1 will flow out through the inner large hole 12 on the inner sleeve 1 and the outer large hole 13 on the outer sleeve 11.

[0062] Fresh air enters the air pipe 2 through the air connector 5, and then is distributed to the mixing chamber through multiple air outlet holes evenly distributed on the air pipe 2. Since the mixing chamber is relatively closed, the mixed gas forms pressure accumulation in the mixing chamber, which can accelerate the flow of gas, so that the mixed gas is mixed more evenly. Then, the evenly mixed mixed gas enters the pressure stabilizing chamber evenly in the length direction of the shell 6 through the evenly distributed through holes on the partition 3. Then, the mixed gas in the pressure stabilizing chamber enters each cylinder.

[0063] The present invention also discloses a diesel engine, comprising a circulating exhaust gas mixing device. In particular, the circulating exhaust gas mixing device is any one of the above-mentioned circulating exhaust gas mixing devices. The above-mentioned circulating exhaust gas mixing device has the above-mentioned advantages. The diesel engine having the above-mentioned circulating exhaust gas mixing device also has the above-mentioned advantages, so it will not be repeated in this article.

[0064] Finally, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0065] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circulating exhaust gas mixing device, characterized in that: The invention comprises a shell, wherein a partition is arranged inside the shell, wherein the partition divides the inner cavity of the shell into a mixing cavity and a pressure stabilizing cavity, and wherein a through hole for connecting the mixing cavity and the pressure stabilizing cavity is arranged on the partition; A circulating exhaust gas pipe and an air pipe are arranged in the mixing chamber, both of which are straight pipes, a plurality of circulating exhaust gas outlet holes are arranged on the circulating exhaust gas pipe, a plurality of air outlet holes are arranged on the air pipe, and the pressure stabilizing chamber is connected to the cylinder; The circulating exhaust gas pipe is a sleeve-type structure, including an outer sleeve and an inner sleeve. The circulating exhaust gas enters the inner sleeve. The outer sleeve is fixed relative to the shell. The ends of the outer sleeve and the inner sleeve are both blind ends. A compression spring is provided between the blind ends of the outer sleeve and the inner sleeve. The inner sleeve is provided with inner large holes and small holes at intervals along its axial direction, and the outer sleeve is provided with multiple outer large holes along its axial direction. When the intake amount of the circulating exhaust gas is small, the small holes on the inner sleeve are aligned with the outer large holes on the outer sleeve. When the intake amount of the circulating exhaust gas increases, the inner sleeve compresses the compression spring, and the inner large holes on the inner sleeve are gradually aligned with the outer large holes on the outer sleeve.

2. The circulating exhaust gas mixing device according to claim 1, characterized in that: A plurality of through holes are evenly distributed on the partition.

3. The circulating exhaust gas mixing device according to claim 1, characterized in that: The mixing chamber is a rectangular parallelepiped chamber, the cross section of the partition is a rectangle, and the contour edge of the partition is sequentially connected to the inner wall of the shell at the partition.

4. The circulating exhaust gas mixing device according to claim 1, characterized in that: The circulating exhaust gas pipe and the air pipe are arranged in parallel, and one of them is closer to the partition plate than the other.

5. The circulating exhaust gas mixing device according to claim 1, characterized in that: Two opposite slots are arranged on the inner wall of the shell, and the openings of the two slots are opposite to each other. The two wide sides of the partition are respectively inserted into the two slots.

6. The circulating exhaust gas mixing device according to claim 1, characterized in that: A convex cavity protruding outward is formed on the side plate in contact with a long side of the partition, the convex cavity is connected with the pressure stabilizing cavity, and a flange is provided at the end of the convex cavity, and the flange is connected to the cylinder.

7. The circulating exhaust gas mixing device according to claim 6, characterized in that: The side plate in contact with the other long side of the partition is fixed to the main body of the shell by welding.

8. The circulating exhaust gas mixing device according to claim 1, characterized in that: It also includes a circulating exhaust gas connector and an air connector which are arranged on the side of the shell. The circulating exhaust gas pipe is communicated with the circulating exhaust gas connector, and the air pipe is communicated with the air connector.

9. The circulating exhaust gas mixing device according to claim 1, characterized in that: The inner sleeve is provided with a circle of inner large holes and a circle of small holes at intervals along its axial direction, and the outer sleeve is provided with a plurality of circles of outer large holes along its axial direction.

10. The circulating exhaust gas mixing device according to claim 1, characterized in that: The outer large hole and the inner large hole are both strip-shaped holes, and the small hole is a circular hole.

11. The circulating exhaust gas mixing device according to claim 1, characterized in that: It also includes a clamping ring, which is subjected to the extrusion force of the circulating exhaust gas connector and applies the extrusion force to the end faces of the outer sleeve and the starting ends of the inner sleeve. The outer sleeve is pressed against the shell, and the inner sleeve squeezes the compression spring. The circulating exhaust gas connector is connected to the shell and communicates with the inner sleeve.

12. The circulating exhaust gas mixing device according to claim 11, characterized in that: The circulating exhaust gas connector has a first flange, the housing has a second flange used in conjunction with the first flange, the clamping ring is located in the center hole of the second flange, and the end surface of the first flange is used to squeeze the clamping ring.

13. The circulating exhaust gas mixing device according to claim 11, characterized in that: The starting end of the inner sleeve is also provided with a pipe head, a pipe shoulder is formed between the pipe head and the end face of the starting end of the inner sleeve, the clamping ring squeezes the inner sleeve through the pipe shoulder, and the pipe head extends into the inner cavity of the circulating exhaust gas connector.

14. The circulating exhaust gas mixing device according to claim 1, characterized in that: One of the inner sleeve and the outer sleeve is provided with a protrusion, and the other is provided with a groove matched with the protrusion, and the groove extends along the axial direction of the inner sleeve or the outer sleeve.

15. A diesel engine, comprising a circulating exhaust gas mixing device, characterized in that: The circulating exhaust gas mixing device is the circulating exhaust gas mixing device as described in any one of claims 1-14.

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