Exhaust gas recirculation mixing device

Abstract

The utility model provides an exhaust gas recirculation mixing device which comprises a shell and a separation structure, the shell is provided with a gas inlet, a gas outlet and a communication cavity communicated with the gas inlet and the gas outlet, the separation structure is connected with the shell, and the separation structure is arranged in the communication cavity in the extending direction of the shell so as to divide the communication cavity into at least two communication channels; the at least two flow guide structures and the at least two communication channels are arranged in a one-to-one correspondence mode, all the flow guide structures are arranged in the corresponding communication channels, and all the flow guide structures are used for forming corresponding airflow channels with the corresponding communication channels in an enclosing mode; the flow path of one of the at least two airflow channels is larger than or smaller than the flow path of the other of the at least two airflow channels. By adopting the technical scheme provided by the utility model, the technical problem that the waste gas proportion fluctuation of the mixed gas of the waste gas recirculation mixing device in the prior art is relatively large can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine devices, in particular to an exhaust gas recirculation mixing device. Background Art

[0002] Currently, in order to reduce NO x (Nitrogen oxide) emissions, most engines introduce EGR (exhaust gas recirculation) technology, which cools the exhaust gas after combustion and then reintroduces it into the engine intake to increase the heat capacity of the working fluid in the cylinder, reduce the combustion temperature, and thus reduce NO x In order to evenly distribute the exhaust gas to each cylinder of the engine, an exhaust gas recirculation system in the prior art is often provided with an exhaust gas recirculation mixing device, through which the exhaust gas is mixed with air and then the mixed gas is introduced into the engine.

[0003] However, due to the differences in the exhaust gas flow and flow rate of each cylinder of the engine returning to the exhaust gas recirculation mixing device, the total amount of exhaust gas collected from multiple cylinders will vary from time to time. This will make the flow of exhaust gas entering the exhaust gas recirculation mixing device uneven per unit time, which will further affect the proportion of exhaust gas in the mixed gas after mixing, making the proportion of exhaust gas in the mixed gas vary from time to time, causing the exhaust gas proportion of the mixed gas to fluctuate greatly, thereby resulting in poor mixing effect. Utility Model Content

[0004] The main purpose of the utility model is to provide an exhaust gas recirculation mixing device to solve the technical problem of large fluctuations in the exhaust gas proportion of the mixed gas in the exhaust gas recirculation mixing device in the prior art.

[0005] In order to achieve the above object, the utility model provides an exhaust gas recirculation mixing device, comprising:

[0006] A shell and a partition structure, wherein the shell has an air inlet, an air outlet, and a communication cavity connected to the air inlet and the air outlet, and the partition structure is connected to the shell, and the partition structure is arranged in the communication cavity along the extension direction of the shell to divide the communication cavity into at least two communication channels;

[0007] At least two flow-guiding structures, the at least two flow-guiding structures are arranged in one-to-one correspondence with the at least two connecting channels, each flow-guiding structure is arranged in a corresponding connecting channel, and each flow-guiding structure is used to enclose a corresponding airflow channel with the corresponding connecting channel;

[0008] The flow rate of one of the at least two air flow channels is greater than or less than the flow rate of another of the at least two air flow channels.

[0009] Further, the at least two communicating channels include a first communicating channel and a second communicating channel, and the at least two flow guiding structures include a first flow guiding structure and a second flow guiding structure, the first flow guiding structure is arranged in the first communicating channel, and the second flow guiding structure is arranged in the second communicating channel;

[0010] The first guide structure is a guide plate group, the second guide structure is a spoiler plate group, and the number of plates in the guide plate group is greater than or less than the number of plates in the spoiler plate group.

[0011] Further, the guide plate group includes at least two guide plates, and the at least two guide plates are staggeredly arranged in the first connecting channel to form a reciprocating first airflow channel in the first connecting channel; and / or,

[0012] The spoiler set includes at least two spoilers, and the at least two spoilers are staggeredly arranged in the second communicating channel to form a reciprocating second airflow channel in the second communicating channel.

[0013] Furthermore, the guide plate group includes a first guide plate and a second guide plate that are staggered, the first guide plate is provided with guide holes, the second guide plate is a solid plate, and the first guide plate is located on a side of the second guide plate close to the air inlet.

[0014] Furthermore, the spoiler plate group includes first spoilers and second spoilers arranged alternately, the first spoilers are provided with first spoiler flow holes, the second spoilers are provided with second spoiler flow holes, and the shapes of the first spoiler flow holes are different from the shapes of the second spoiler flow holes.

[0015] Further, the first spoiler is located on a side of the second spoiler close to the air inlet;

[0016] The first turbulent flow hole is a circular hole; and / or,

[0017] The second turbulent flow hole is a strip hole; and / or,

[0018] The spoiler group also includes a third spoiler and a fourth spoiler arranged alternately, the third spoiler is located on a side of the second spoiler away from the first spoiler, the fourth spoiler is located on a side of the third spoiler away from the second spoiler, and the third spoiler and the fourth spoiler are both solid plates.

[0019] Further, at least one guide plate is provided with a guide hole; the guide hole is a circular hole of equal diameter, or a gradually expanding circular hole, or a strip hole, or a gradually expanding strip hole; and / or,

[0020] At least one spoiler plate is provided with a spoiler flow hole, which is a circular hole with a constant diameter, or a gradually expanding circular hole, or a strip hole, or a gradually expanding strip hole.

[0021] Further, the air inlet is a circular hole, and the diameter of the air inlet is d;

[0022] Wherein, the diameter of the equal diameter circular hole is r, 0.02d≤r≤0.1d; and / or,

[0023] The maximum diameter of the gradually expanding circular hole is r1, the minimum diameter of the gradually expanding circular hole is r2, r2=r1 / 2, 0.02d≤r1≤0.1d; and / or,

[0024] The length of the strip hole is a, the width of the strip hole is b, 0.1d≤a≤0.8d, 0.02d≤b≤0.1d; and / or,

[0025] The maximum length of the gradually expanding strip hole is a1, the maximum width of the gradually expanding strip hole is b1, the minimum width of the gradually expanding strip hole is b2, b2=b1 / 2, 0.1d≤a1≤0.8d, 0.02d≤b1≤0.1d.

[0026] Further, the guide plate group includes a first guide plate, and the spoiler plate group includes a first spoiler;

[0027] The first guide plate is a flat plate or a curved plate; and / or,

[0028] The first spoiler is a flat plate or a curved plate; and / or,

[0029] The area of ​​the guide holes on the first guide plate is S 总1 , the plate area of ​​the first guide plate is S 板1 , 0.1S 板1 ≤S 总1 ≤0.7S 板1 ;

[0030] The area of ​​the spoiler flow hole of the first spoiler is S 总2 , the area of ​​the first spoiler is S 板2 , 0.1S 板2 ≤S 总2 ≤0.7 S 板2 .

[0031] Furthermore, a first connection portion is provided at one end of the shell away from the air outlet, and a second connection portion is provided at one end of the shell away from the air inlet; the exhaust gas recirculation mixing device further comprises:

[0032] The first connecting portion is detachably connected to the air intake pipe; and / or,

[0033] The second connecting portion is detachably connected to the air outlet pipe.

[0034] By applying the technical solution of the utility model, the partition structure divides the connecting cavity into at least two connecting channels. The mixed gas of air and exhaust gas enters each connecting channel after entering the exhaust gas recirculation mixing device from the air inlet. The multiple flow-guiding structures arranged in each connecting channel and the corresponding connecting channel enclose a corresponding airflow channel. Since the flow of at least one gas flow channel is greater or less than the flow of other airflow channels, there is a phase difference between different airflow channels. The EGR rate of the mixed gas at the outlet can be stabilized within a relatively uniform range without large fluctuations due to the pulsating characteristics at the air inlet. Therefore, the present application solves the technical problem of large fluctuations in the exhaust gas ratio of the mixed gas in the exhaust gas recirculation mixing device in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0036] Figure 1 A schematic structural diagram of an exhaust gas recirculation mixing device provided according to an embodiment of the utility model is shown;

[0037] Figure 2 A perspective view of an exhaust gas recirculation mixing device provided according to an embodiment of the utility model is shown;

[0038] Figure 3 A schematic diagram of the internal structure of an exhaust gas recirculation mixing device provided according to an embodiment of the utility model at a certain viewing angle is shown;

[0039] Figure 4 A schematic diagram of the internal structure of the communication channel in the exhaust gas recirculation mixing device provided according to an embodiment of the utility model when the guide structure is an arc-shaped plate group;

[0040] Figure 5 A schematic structural diagram is shown when the guide holes of the first guide plate in the exhaust gas recirculation mixing device provided according to an embodiment of the utility model are equal-diameter circular holes;

[0041] Figure 6 A schematic structural diagram is shown when the guide holes of the first guide plate in the exhaust gas recirculation mixing device provided in an embodiment of the utility model are gradually expanding circular holes;

[0042] Figure 7 A schematic structural diagram is shown when the guide holes of the first guide plate in the exhaust gas recirculation mixing device provided according to an embodiment of the utility model are strip-shaped holes;

[0043] Figure 8A schematic structural diagram is shown when the guide holes of the first guide plate in the exhaust gas recirculation mixing device provided according to an embodiment of the utility model are gradually expanding strip holes;

[0044] Fig. 9 The overall structural schematic diagram of the exhaust gas recirculation mixing device provided according to the embodiment of the utility model is shown;

[0045] Fig.10 A schematic diagram of the exhaust gas mass flow at the exhaust gas inlet and outlet of the exhaust gas recirculation mixing device provided according to an embodiment of the utility model is shown.

[0046] The above drawings include the following reference numerals:

[0047] 10. Shell; 11. Air inlet; 12. Air outlet; 13. Communication cavity; 131. First communication channel; 132. Second communication channel; 141. First connection part; 142. Second connection part;

[0048] 20. Partition structure;

[0049] 30. guide structure; 31. first guide structure; 311. first guide plate; 3111. guide hole; 312. second guide plate; 32. second guide structure; 321. first spoiler plate; 3211. first spoiler hole; 322. second spoiler plate; 3221. second spoiler hole; 323. third spoiler plate; 324. fourth spoiler plate;

[0050] 40. Intake pipe; 41. Air inlet; 42. Exhaust pipe;

[0051] 50. Exhaust pipe. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] like Figures 1 to 9As shown, an embodiment of the utility model provides an exhaust gas recirculation mixing device, which includes a shell 10, a partition structure 20 and at least two guide structures 30. The shell 10 has an air inlet 11, an air outlet 12 and a connecting cavity 13 connected to both the air inlet 11 and the air outlet 12. The partition structure 20 connected to the shell 10 is arranged in the connecting cavity 13 along the extension direction of the shell 10, and divides the connecting cavity 13 into at least two connecting channels. At least two guide structures 30 are arranged in a one-to-one correspondence with at least two connecting channels, each guide structure 30 is arranged in a corresponding connecting channel, and each guide structure 30 is used to enclose a corresponding airflow channel with the corresponding connecting channel, and the flow of one of the at least two airflow channels is greater than or less than the flow of the other of the at least two airflow channels.

[0054] In the exhaust gas recirculation mixing device provided in this embodiment, the partition structure 20 divides the connecting chamber 13 into at least two connecting channels. The mixed gas of air and exhaust gas enters each connecting channel after entering the exhaust gas recirculation mixing device from the air inlet 11. The multiple flow guide structures 30 arranged in each connecting channel and the corresponding connecting channel enclose a corresponding air flow channel. Since the flow of at least one gas flow channel is greater or less than the flow of other air flow channels, there is a phase difference between different air flow channels, and the gases in different air flow channels will be mixed at the outlet 12, so that the EGR rate of the mixed gas at the outlet 12 (the ratio of the exhaust gas recirculation volume to the gas entering the cylinder) can be stabilized within a relatively uniform range, and will not produce large fluctuations due to the pulsation characteristics at the air inlet 11. In addition, the exhaust gas recirculation mixing device provided by the utility model does not have an additional mixing structure. Under the condition that the EGR rate of the mixed gas at the outlet 12 can be ensured to be stable, the structure is relatively simple, the size and weight are small, the space utilization rate is high, and the gas pressure loss is small.

[0055] Specifically, within a limited range, the more communication channels there are, the more stable the EGR rate at the outlet port 12 is.

[0056] Specifically, the number of the communication channels is determined by the size of the exhaust gas recirculation mixing device. For example, if the exhaust gas recirculation mixing device is used in a vehicle, the number of the communication channels may be 2, 3, or 4, and if the exhaust gas recirculation mixing device is used in a ship, more communication channels may be provided.

[0057] Specifically, the partition structure 20 includes at least one partition plate. If there is one partition plate, the partition plate is arranged in the middle of the gas channel. In this case, the connecting cavity 13 is divided into two connecting channels of the same size by the partition plate. If there are more than two partition plates, each partition plate is arranged at equal intervals so that each connecting channel has the same cross-sectional size.

[0058] In this embodiment, at least two communication channels include a first communication channel 131 and a second communication channel 132, and at least two flow guide structures 30 include a first flow guide structure 31 and a second flow guide structure 32. The first flow guide structure 31 is disposed in the first communication channel 131, and the second flow guide structure 32 is disposed in the second communication channel 132. The first flow guide structure 31 is a flow guide plate group, and the second flow guide structure 32 is a spoiler plate group, and the number of plates in the flow guide plate group is greater than or less than the number of plates in the spoiler plate group.

[0059] With such a setting, the first guide structure 31 is a guide plate group including multiple plates, and the second guide structure 32 is a spoiler plate group including multiple plates, and the number of plates in the guide plate group is different from the number of plates in the spoiler plate group, so that by setting different numbers of plates in the two through channels, the gas flow in the two connecting channels is different, and the airflow between different airflow channels has a phase difference. After the airflow between different airflow channels is mixed, the influence of the pulsation of the exhaust gas flow on the mixed gas EGR rate at the outlet 12 can be reduced, so that the mixed gas EGR rate at the outlet 12 can be stabilized within a relatively uniform range. In this way, only different numbers of plates need to be set in the two connecting channels to form a phase difference in the gas flow channels in the two connecting channels, and the structure is relatively simple and the production cost is low. Specifically, if there are multiple connecting channels, plates with different numbers from those in the first connecting channel 131 and the second connecting channel 132 can also be set in other connecting channels, so that the mixed gas EGR rate at the outlet 12 is more stable.

[0060] In this embodiment, the guide plate group includes at least two guide plates, and the at least two guide plates are staggered in the first communication channel 131 to form a reciprocating first airflow channel in the first communication channel 131. In this way, the at least two staggered guide plates can extend the flow of the gas in the first communication channel 131, and while enhancing the mixing effect of air and exhaust gas, it is convenient to set the airflow channel in the first communication channel 131, so as to form a phase difference between the at least two airflow channels.

[0061] In this embodiment, the spoiler set includes at least two spoilers, and the at least two spoilers are staggered in the second communication channel 132 to form a reciprocating second airflow channel in the second communication channel 132. In this way, the at least two staggered spoilers can extend the flow of the gas in the second communication channel 132, and while enhancing the mixing effect of air and exhaust gas, it is convenient to set the airflow channel in the second communication channel 132, so as to form a phase difference between the at least two airflow channels.

[0062] In this embodiment, the guide plate group includes a first guide plate 311 and a second guide plate 312 which are arranged alternately. The first guide plate 311 is provided with a guide hole 3111, and the second guide plate 312 is a solid plate. The first guide plate 311 is located on a side of the second guide plate 312 close to the air inlet 11. In this way, the first guide plate 311 provided with the guide hole 3111 is arranged on a side relatively close to the air inlet 11, which can improve the air intake efficiency at the air inlet 11 and the mixing effect of air and exhaust gas in the mixed gas. In addition, the first guide hole 3111 is provided to facilitate the gas to pass through the first connecting channel 131, reduce the pressure loss of the gas in the first connecting channel 131, thereby optimizing the spatial structure of the exhaust gas recirculation mixing device, and further reducing the power loss of the power system. In addition, the weight of the first guide plate 311 provided with the guide hole 3111 is relatively small, which reduces the weight of the exhaust gas recirculation device, and further reduces the overall fuel consumption. In addition, by configuring the second guide plate 312 as a solid plate, the effect of extending the gas flow path can be ensured.

[0063] In this embodiment, the spoiler set includes a first spoiler 321 and a second spoiler 322 arranged alternately, the first spoiler 321 is provided with a first spoiler flow hole 3211, the second spoiler 322 is provided with a second spoiler flow hole 3221, and the shape of the first spoiler flow hole 3211 is different from the shape of the second spoiler flow hole 3221. In this way, the shape of the first spoiler flow hole 3211 is different from the shape of the second spoiler flow hole 3221, and when the exhaust gas and air in the mixed gas pass through the first spoiler flow hole 3211 and the second spoiler flow hole 3221, the gas molecules can fully collide, thereby improving the mixing effect of the air and the exhaust gas in the mixed gas, and the first spoiler flow hole 3211 and the second spoiler flow hole 3221 are provided, which can facilitate the gas to pass through the second connecting channel 132, thereby reducing the pressure loss of the gas in the second connecting channel 132, and in addition, the second guide plate 312 provided with the spoiler flow hole has a small mass, and the power loss of the power system is small.

[0064] In this embodiment, the first spoiler 321 is located on the side of the second spoiler 322 close to the air inlet 11. The first spoiler flow hole 3211 is a circular hole; and / or the second spoiler flow hole 3221 is a strip hole. In this way, the shape of the first spoiler flow hole 3211 is different from the shape of the second spoiler flow hole 3221. When the exhaust gas and air in the mixed gas pass through the first spoiler flow hole 3211 and the second spoiler flow hole 3221, the gas separates and collides, thereby improving the mixing effect of the air and exhaust gas in the mixed gas.

[0065] In this embodiment, the spoiler set further includes a third spoiler 323 and a fourth spoiler 324 which are staggered, the third spoiler 323 is located on a side of the second spoiler 322 away from the first spoiler 321, the fourth spoiler 324 is located on a side of the third spoiler 323 away from the second spoiler 322, and the third spoiler 323 and the fourth spoiler 324 are solid plates. In this way, by setting the third spoiler 323 and the fourth spoiler 324 as solid plates, the gas flow path can be fully extended to ensure that the air and the exhaust gas in the mixed gas have sufficient mixing time, thereby ensuring the mixing time of the two.

[0066] In this embodiment, at least one guide plate is provided with a flow guide hole 3111, and the flow guide hole 3111 is a circular hole of equal diameter, or a gradually expanding circular hole, or a strip hole, or a gradually expanding strip hole. In this way, the pressure loss of the mixed gas in the exhaust gas recirculation mixing device can be reduced, thereby reducing the efficiency of the engine and reducing the fuel loss of the engine. In addition, when the flow guide hole 3111 is a circular hole of equal diameter or a gradually expanding circular hole, the gas molecules can fully collide at the flow guide hole 3111, thereby ensuring the mixing effect of the air and exhaust gas in the mixed gas; when the flow guide hole 3111 is a strip hole or a gradually expanding strip hole, it can ensure that the pressure loss of the gas is further reduced. In addition, the flow guide holes 3111 on each guide plate can be of different shapes, and the flow guide holes 3111 on one guide plate can also be of different shapes. The shape of the flow guide hole 3111 is determined by specific needs, and no further restrictions are made here.

[0067] In this embodiment, at least one spoiler is provided with a perturbation flow hole, which is a circular hole of equal diameter, or a gradually expanding circular hole, or a strip hole, or a gradually expanding strip hole. In this way, the pressure loss of the mixed gas in the exhaust gas recirculation mixing device can be reduced, thereby reducing the efficiency of the engine and reducing the fuel loss of the engine. In addition, when the perturbation flow hole is a circular hole of equal diameter or a gradually expanding circular hole, the gas molecules can fully collide at the perturbation flow hole, thereby ensuring the mixing effect of the air and exhaust gas in the mixed gas; when the perturbation flow hole is a strip hole or a gradually expanding strip hole, it can ensure that the pressure loss of the gas is further reduced. In addition, the perturbation flow holes on each spoiler can be of different shapes, and the perturbation flow holes on one spoiler can also be of different shapes. The shape of the perturbation flow hole is determined by specific needs, and no further restrictions are made here.

[0068] In this embodiment, the air inlet 11 is a circular hole, and the diameter of the air inlet 11 is d. Specifically, the shape of the air inlet can also be a rectangle. If the shape of the air inlet 11 is in the positive direction, the side length of the air inlet 11 is d. The air inlet 11 can also be other shapes, which are not limited here.

[0069] In this embodiment, if Figure 5As shown, the diameter of the equal diameter circular hole is r, 0.02d≤r≤0.1d. In this way, it can ensure that the gas molecules can fully collide at the gradually expanding circular hole and ensure the mixing effect of air and exhaust gas in the mixed gas.

[0070] In this embodiment, if Figure 6 As shown, the maximum diameter of the gradually expanding circular hole is r1, the minimum diameter of the gradually expanding circular hole is r2, r2=r1 / 2, 0.02d≤r1≤0.1d. In this way, the collision effect of gas molecules at the gradually expanding circular hole can be further improved, and the mixing effect of air and exhaust gas in the mixed gas can be improved.

[0071] In this embodiment, if Figure 7 As shown, the length of the strip hole is a, the width of the strip hole is b, 0.1d≤a≤0.8d, 0.02d≤b≤0.1d. In this way, the pressure loss of the gas can be reduced, thereby ensuring the working efficiency of the engine.

[0072] In this embodiment, if Figure 8 As shown, the maximum length of the gradually expanding strip hole is a1, the maximum width of the gradually expanding strip hole is b1, the minimum width of the gradually expanding strip hole is b2, b2=b1 / 2, 0.1d≤a1≤0.8d, 0.02d≤b1≤0.1d. In this way, while ensuring the reduction of gas pressure loss, the collision effect of gas molecules at the gradually expanding strip hole can be improved, and the mixing effect of air and exhaust gas in the mixed gas can be improved.

[0073] In this embodiment, the guide plate group includes a first guide plate 311, and the spoiler plate group includes a first spoiler 321. The first guide plate 311 is a flat plate or an arc plate; and / or, the first spoiler 321 is a flat plate or an arc plate. In this way, when the first guide plate 311 and / or the first spoiler 321 are flat plates, the gas flow path can be fully extended to ensure that the air and exhaust gas in the mixed gas have sufficient mixing time, thereby ensuring the mixing time of the two. When the first guide plate 311 and / or the first spoiler 321 are arc plates, the flow of the gas can be guided, thereby reducing the pressure loss of the gas and improving the working efficiency of the engine.

[0074] In this embodiment, the area of ​​the guide hole 3111 on the first guide plate 311 is S 总1 , the plate area of ​​the first guide plate 311 is S 板1 , 0.1S 板1 ≤S 总1 ≤0.7S 板1 The area of ​​the first spoiler 321 is S. 总2 , the plate area of ​​the first spoiler 321 is S 板2 , 0.1S 板2 ≤S总2 ≤0.7 S板2 . Specifically, S 总1 is the total cross-sectional area of ​​all holes on the first guide plate 311, S 板1 is the plate area of ​​the first guide plate 311, S 总2 is the total cross-sectional area of ​​all holes on the second guide plate 312, S 板2 is the plate area of ​​the second guide plate 312. 总1 and / or S 总2 When S is small, the amount of gas passing through the flow guide hole 3111 and / or the turbulent flow hole can be reduced, so that more gas flows through the air flow channel, thereby improving the effect of forming a phase difference between the air flow channels when the flow paths of the air flow channels are different. 总1 and / or S 总2 When it is larger, it can reduce the pressure loss of the gas, improve the working efficiency of the engine, and also reduce the weight of the exhaust gas recirculation mixing device, thereby reducing fuel consumption.

[0075] It should be noted that, “the hole area of ​​the guide holes 3111 on the first guide plate 311” can be understood as the sum of the hole areas of all the guide holes 3111 on the first guide plate 311; and “the hole area of ​​the spoiler holes of the first spoiler plate 321” can be understood as the sum of the hole areas of all the spoiler holes on the first spoiler plate 321.

[0076] In this embodiment, a first connection portion 141 is provided at one end of the housing 10 away from the air outlet 12, and a second connection portion 142 is provided at one end of the housing 10 away from the air inlet 11. The exhaust gas recirculation mixing device further includes: an air inlet pipe 40 and an air outlet pipe 50, the first connection portion 141 is detachably connected to the air inlet pipe 40, and the second connection portion 142 is detachably connected to the air outlet pipe 50. In this way, the housing 10 can be disassembled from the air inlet pipe 40 through the first connection portion 141, and the housing 10 can be disassembled from the air outlet pipe 50 through the second connection portion 142, so that the housing 10 is modularized, ensuring that the housing 10 can be used in different scenarios, thereby improving the versatility of the exhaust gas recirculation mixing device.

[0077] Specifically, the intake pipe 40 is provided with an air inlet 41 and an exhaust gas inlet. Air is introduced from the air inlet 41. The exhaust gas inlet is connected to the exhaust gas pipe 42. The exhaust gas pipe 42 is connected to the exhaust port of the engine. The cooled exhaust gas after combustion is introduced into the intake pipe 40 from the exhaust gas pipe 42. The air and the exhaust gas are preliminarily mixed in the intake pipe 40 and introduced into the housing 10 for further mixing to reduce NO x Generation of.

[0078] Specifically, the first connection portion 141 and the second connection portion 142 may be flange devices, or other devices for connection.

[0079] Specifically, Fig.10 The schematic diagram shows the mass flow rate of exhaust gas at the air inlet 11 and the air outlet 12 of the exhaust gas recirculation mixing device provided in this embodiment under certain working conditions. Specifically, Fig.10 The horizontal axis is the mass flow rate of exhaust gas, and the horizontal axis is the crankshaft angle of the engine. The physical meaning is the angle of rotation of the engine crankshaft, which is directly proportional to time. The curve with larger fluctuation is the exhaust gas mass flow curve at the EGR inlet (equivalent to the exhaust gas inlet), and the curve with the smallest fluctuation is the exhaust gas mass flow curve at the outlet 12 when the EGR three-channel is designed (equivalent to the design of three connecting channels), and the middle curve is the exhaust gas mass flow curve at the outlet 12 when the EGR two-channel is designed (equivalent to two connecting channels). It can be seen from the figure that there is obvious pulsation in the exhaust gas mass flow at the exhaust gas inlet. This is because of the working characteristics of the engine. There is a backflow of exhaust gas at the exhaust gas inlet. After passing through the exhaust gas recirculation mixing device with multiple connecting channels, the fluctuation of the exhaust gas mass flow curve at the outlet 12 is greatly reduced, and with the increase in the number of mixing channels, the exhaust gas mass flow curve gradually tends to be stable. Fig.10 Under the working conditions, when three connecting channels are designed, the exhaust gas mass flow curve is relatively stable and the mixing is efficient. Moreover, in the exhaust gas recirculation mixing device provided by the present application, since the mixing is carried out by phase difference, the length of the entire shell 10 does not need to be very long, thereby greatly reducing the size of the entire gas circulation system. In addition, after setting up multiple connecting channels, compared with the traditional mixer, instead of using a small throat to reduce the flow area, the connecting channels are increased, the flow area is increased, and the pressure loss is reduced. Because of the large flow area and process differences of the exhaust gas recirculation mixing device itself, the versatility of the exhaust gas recirculation mixing device is greatly increased, and it can be applied to machines of different displacements. When the first connecting portion 141 and the second connecting portion 142 are flanges, when developing a new model, only the connecting flange needs to be redesigned, which reduces the design difficulty and improves the modularity of the model design.

[0080] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: while being able to ensure that the EGR rate of the mixed gas at the outlet 12 is stable, the structure is relatively simple, the size and weight are small, the space utilization rate is high, and the gas pressure loss is small.

[0081] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0082] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0083] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0084] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0085] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0086] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An exhaust gas recirculation mixing device, It is characterized in that include: A shell (10) and a partition structure (20), the shell (10) having an air inlet (11), an air outlet (12), and a communication cavity (13) communicating with both the air inlet (11) and the air outlet (12), the partition structure (20) being connected to the shell (10), and the partition structure (20) being arranged in the communication cavity (13) along an extension direction of the shell (10) so as to divide the communication cavity (13) into at least two communication channels; at least two flow-guiding structures (30), the at least two flow-guiding structures (30) being arranged in one-to-one correspondence with the at least two connecting channels, each flow-guiding structure (30) being arranged in a corresponding connecting channel, and each flow-guiding structure (30) being used to enclose a corresponding airflow channel with the corresponding connecting channel; Wherein, the flow rate of at least one of the at least two air flow channels is greater than or less than the flow rate of the other of the at least two air flow channels.

2. The exhaust gas recirculation mixing device according to claim 1, It is characterized in that The at least two communicating channels include a first communicating channel (131) and a second communicating channel (132); the at least two flow guiding structures (30) include a first flow guiding structure (31) and a second flow guiding structure (32); the first flow guiding structure (31) is arranged in the first communicating channel (131); and the second flow guiding structure (32) is arranged in the second communicating channel (132); The first flow guide structure (31) is a flow guide plate group, the second flow guide structure (32) is a spoiler plate group, and the number of plates in the flow guide plate group is greater than or less than the number of plates in the spoiler plate group.

3. The exhaust gas recirculation mixing device according to claim 2, It is characterized in that The guide plate group comprises at least two guide plates, and the at least two guide plates are staggeredly arranged in the first connecting channel (131) to form a reciprocating first airflow channel in the first connecting channel (131); and / or, The spoiler plate group comprises at least two spoilers, and the at least two spoilers are staggeredly arranged in the second connecting channel (132) to form a reciprocating second airflow channel in the second connecting channel (132).

4. The exhaust gas recirculation mixing device according to claim 3, It is characterized in that The guide plate group comprises a first guide plate (311) and a second guide plate (312) which are arranged alternately, the first guide plate (311) is provided with a guide hole (3111), the second guide plate (312) is a solid plate, and the first guide plate (311) is located on a side of the second guide plate (312) close to the air inlet (11).

5. The exhaust gas recirculation mixing device according to claim 3, It is characterized in that The spoiler plate group comprises a first spoiler plate (321) and a second spoiler plate (322) which are arranged alternately, the first spoiler plate (321) is provided with a first spoiler flow hole (3211), the second spoiler plate (322) is provided with a second spoiler flow hole (3221), and the shape of the first spoiler flow hole (3211) is different from the shape of the second spoiler flow hole (3221).

6. The exhaust gas recirculation mixing device according to claim 5, It is characterized in that The first spoiler (321) is located on a side of the second spoiler (322) close to the air inlet (11); Wherein, the first turbulent flow hole (3211) is a circular hole; and / or, The second turbulent flow hole (3221) is a strip-shaped hole; and / or, The spoiler group further comprises a third spoiler (323) and a fourth spoiler (324) which are arranged alternately, wherein the third spoiler (323) is located on a side of the second spoiler (322) away from the first spoiler (321), and the fourth spoiler (324) is located on a side of the third spoiler (323) away from the second spoiler (322), and both the third spoiler (323) and the fourth spoiler (324) are solid plates.

7. The exhaust gas recirculation mixing device according to claim 3, It is characterized in that At least one of the guide plates is provided with a flow guide hole (3111); the flow guide hole (3111) is a circular hole of equal diameter, or a gradually expanding circular hole, or a strip hole, or a gradually expanding strip hole; and / or, At least one of the spoiler plates is provided with a spoiler flow hole, which is a circular hole with a constant diameter, a gradually expanding circular hole, a strip hole, or a gradually expanding strip hole.

8. The exhaust gas recirculation mixing device according to claim 7, It is characterized in that The air inlet (11) is a circular hole, and the diameter of the air inlet (11) is d; Wherein, the diameter of the equal-diameter circular hole is r, 0.02d≤r≤0.1d; and / or, The maximum diameter of the gradually expanding circular hole is r 1 , the minimum diameter of the gradually expanding circular hole is r 2 , r 2 =r 1 / 2, 0.02d≤r 1 ≤0.1d; and / or, The length of the strip hole is a, the width of the strip hole is b, 0.1d≤a≤0.8d, 0.02d≤b≤0.1d; and / or, The length of the gradually expanding strip hole is a 1 , the maximum width of the gradually expanding strip hole is b 1 , the minimum width of the gradually expanding strip hole is b 2 , b 2 =b 1 / 2, 0.1d≤a 1 ≤0.8d, 0.02d≤b 1 ≤0.1d.

9. The exhaust gas recirculation mixing device according to claim 7, It is characterized in that The guide plate group includes a first guide plate (311), and the spoiler plate group includes a first spoiler (321); The first guide plate (311) is a flat plate or an arc-shaped plate; and / or, The first spoiler (321) is a flat plate or a curved plate; and / or, The hole area of ​​the guide hole (3111) on the first guide plate (311) is S 总1 , the plate area of ​​the first guide plate (311) is S 板1 , 0.1S 板1 ≤S 总1 ≤0.7S 板1 ; The area of ​​the spoiler flow holes of the first spoiler plate (321) is S 总2 , the plate area of ​​the first spoiler (321) is S 板2 , 0.1S 板2 ≤S 总2 ≤0.7S 板2 .

10. The exhaust gas recirculation mixing device according to any one of claims 1 to 9, It is characterized in that The end of the shell (10) away from the air outlet (12) is provided with a first connection portion (141), and the end of the shell (10) away from the air inlet (11) is provided with a second connection portion (142); the exhaust gas recirculation mixing device further comprises: an air intake pipe (40), wherein the first connection portion (141) is detachably connected to the air intake pipe (40); and / or, An air outlet pipe (50), wherein the second connection portion (142) is detachably connected to the air outlet pipe (50).

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