EGR mixer

Abstract

The utility model provides an EGR mixer which comprises a gas inlet section, a mixing section and a gas outlet section which are communicated in sequence, a waste gas inlet is formed in the top side of the mixing section, a liquid outlet is formed in the bottom side of the mixing section, a liquid condenser installed in the mixing section is further arranged in the mixing section, the liquid condenser comprises a cylinder, and the two sides of the cylinder are connected with the inner wall of the mixing section in a sealed mode through partition plates. A plurality of fins which are arranged in parallel are uniformly arranged on the barrel body, and through holes which are uniformly formed are formed in the barrel body between every two adjacent fins. According to the EGR mixer, water vapor in damp and hot waste gas is condensed and separated out through the fin refrigerant and the cooling device, the water vapor is prevented from entering an air cylinder, and corrosion to engine parts is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas circulation, in particular to an EGR mixer. Background Art

[0002] The exhaust gas recirculation (EGR) system is a technology that sends a small part of the exhaust gas generated by the engine back to the cylinder for re-combustion. Specifically, the exhaust gas discharged by the engine is mixed with fresh air in the EGR mixer and then enters the cylinder.

[0003] The EGR mixer is an important component of the EGR system. Its function is to fully mix the EGR gas (exhaust gas introduced into the diesel engine intake) and the fresh air after supercharging and intercooling, so that the diesel engine intake at the outlet of the EGR mixer has uniform composition in space.

[0004] The fuel used by marine diesel engines has a high sulfur content, and the sulfide content in its exhaust gas is also high, so when the recirculated exhaust gas mixes with the low-temperature fresh air after supercharging and intercooling, corrosive acidic liquid will precipitate, and this part of the liquid is not allowed to enter the cylinder.

[0005] Patent No. 201420304282.X discloses an EGR mixer for a marine diesel engine, including a mixer housing, an EGR gas introduction device and a release hole. The EGR gas introduction device is arranged on the mixer housing. The release hole is used to release the acidic liquid precipitated when the high-temperature EGR gas is mixed with the fresh air after supercharging and intercooling. The release hole is arranged at the lowest point of the mixer housing. By setting the release hole, the release problem of the acidic liquid is effectively solved, ensuring that the acidic liquid does not enter the cylinder.

[0006] In the above technology, after the EGR gas is mixed with fresh air, only part of the acidic liquid is precipitated, and the precipitation effect of the acidic liquid is not good. After the EGR gas enters the cylinder, it is affected by the cylinder and a small part of the acidic gas is still precipitated, which may cause corrosion to the engine components. Utility Model Content

[0007] In view of the above problems, the utility model provides an EGR mixer.

[0008] An EGR mixer comprises an air intake section, a mixing section and an air outlet section which are connected in sequence, an exhaust gas inlet is provided on the top side of the mixing section, a liquid outlet is provided on the bottom side, the mixing section also comprises a liquid condenser installed in the mixing section, the liquid condenser comprises a cylinder, both sides of the cylinder are sealedly connected to the inner wall of the mixing section through a partition, a plurality of fins are evenly arranged on the cylinder, and evenly arranged through holes are provided on the cylinder between two adjacent fins.

[0009] In a preferred embodiment, a cooling device is fixed on one side of the liquid condenser; at the same time, the fins, the cylinder, and the partition are all made of heat-conducting materials.

[0010] In a preferred embodiment, the cooling device comprises a cooling passage, and the cooling passage is disc-shaped and arranged on the side wall of the partition.

[0011] In a preferred embodiment, the through hole is opened on the side away from the exhaust gas inlet, occupying 2 / 5-3 / 5 of the side surface area of ​​the cylinder.

[0012] In a preferred embodiment, the EGR mixer further comprises: a mixing pipe, which is installed inside the cylinder body, and has two sides which are sealed and connected to the air inlet section and the air outlet section respectively, and a plurality of vent holes are evenly opened in the middle of the mixing pipe.

[0013] In a preferred embodiment, the EGR mixer further comprises a condensation outer pipe, which comprises a venturi tube and is installed on the exhaust gas inlet.

[0014] In a preferred embodiment, the EGR mixer further comprises a control valve installed on the liquid outlet.

[0015] In a preferred embodiment, the mixing section is sealed and assembled with the air inlet section and the air outlet section via a flange.

[0016] Beneficial effects of the EGR mixer of the present application

[0017] When working, the exhaust gas is introduced into the mixing section from the exhaust gas inlet through the condensation outer pipe, the water vapor is condensed and precipitated once, and the remaining hot and humid exhaust gas entering the mixing section encounters the fin cooling medium, the water vapor is condensed and precipitated from the exhaust gas for a second time, and the precipitated condensate is discharged from the liquid outlet. At the same time, fresh air is introduced into the EGR mixer from the intake section, mixed with the remaining exhaust gas passing through the through holes and vents, and finally discharged through the outlet section. This device can prevent water vapor from entering the cylinder and avoid corrosion to engine components. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other characteristics, features and advantages of the present invention will become clear by reading the following description of the exemplary embodiments with reference to the accompanying drawings. The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A cross-sectional view of the EGR mixer of the utility model;

[0020] Figure 2 A structural diagram of the mixing section of the EGR mixer of the utility model;

[0021] Figure 3 Structural diagram of the liquid condenser of the utility model;

[0022] Figure 4 Structural diagram of embodiment 3 of the liquid condenser of the utility model;

[0023] Figure 5 The structure diagram of the condensation outer tube of the utility model;

[0024] Figure 6 The structure diagram of the cooling passage of the utility model;

[0025] Figure 7 The front view of the EGR mixer of the utility model;

[0026] Figure 8 A side view of the EGR mixer of the utility model;

[0027] Fig. 9 A top view of the EGR mixer of the present utility model.

[0028] In the figure: 10, air inlet section; 11, mixing section; 12, air outlet section; 111, exhaust gas inlet; 12, liquid outlet; 20, liquid condenser; 21, cylinder; 22, partition; 23, fin; 24, through hole; 30, cooling device; 31, cooling passage; 40, mixing pipe; 41, vent; 50, condensation outer pipe; 113, control valve; 60, flange. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0030] The EGR mixer is described in detail below in conjunction with the accompanying drawings and embodiments. Example 1

[0031] An EGR mixer includes an air intake section 10, a mixing section 11, and an air outlet section 12 which are connected in sequence. An exhaust gas inlet 111 is provided on the top side of the mixing section 11, and a liquid outlet 112 is provided on the bottom side. The mixing section 11 also includes a liquid condenser 20 installed in the mixing section 11. The liquid condenser 20 includes a cylinder 21. Both sides of the cylinder 21 are sealed and connected to the inner wall of the mixing section 11 through a partition 22. A plurality of parallel fins 23 are evenly arranged on the cylinder 21, and evenly arranged through holes 24 are provided on the cylinder 21 between two adjacent fins 23.

[0032] When working, the exhaust gas is introduced into the mixing section 11 from the exhaust gas inlet 111, and the fresh air is introduced into the EGR mixer from the air intake section 10. The hot and humid exhaust gas encounters the cold medium of the fin 23, and water vapor condenses and precipitates from the exhaust gas. The precipitated condensate is discharged from the liquid outlet 112, and the remaining exhaust gas enters the cylinder 21 from the through hole 24, is evenly mixed with the fresh air, and is discharged through the air outlet section 12. This device can prevent water vapor from entering the cylinder and causing corrosion to engine components.

[0033] The air intake section 10, the mixing section 11, the cylinder 21 and the fins 23 are cooled to a certain extent by the cooling effect of the fresh air.

[0034] The EGR mixer further includes a control valve 113 installed on the liquid outlet 112 .

[0035] The mixing section 11 is sealed and assembled with the air inlet section 10 and the air outlet section 12 via the flange 60 . Example 2

[0036] Example 2 is an improvement on Example 1. The specific improvements include a cooling device 30 fixed to one side of the liquid condenser 20, and the fins 23, cylinder 21, and partition 22 are all made of heat-conducting materials; the cooling device 30 includes a cooling passage 31, and the cooling passage 31 is disc-shaped and arranged on the side of the partition 22.

[0037] Since the cooling effect of fresh air is insufficient, a cooling device 30 is installed on one side of the liquid condenser 20, and coolant is introduced into the cooling passage 31. The fins 23, the cylinder 21, and the partition 22 of the cooling device 30 are cooled by the cooling effect of the coolant, thereby reducing the temperature of the fins 23, the cylinder 21, and the partition 22, thereby improving the precipitation efficiency of the condensate. Example 3

[0038] Embodiment 3 is an improvement on Embodiment 1. Specifically, the through hole 24 is opened on the side away from the exhaust gas inlet 111 and occupies 2 / 5-3 / 5 of the side surface area of ​​the cylinder 21 .

[0039] When working, the EGR mixer opens the through hole 24 on the side away from the exhaust gas inlet 111, so that the exhaust gas stays in the liquid condenser 20 for about half a circle, thereby increasing the condensation time of water vapor in the exhaust gas and improving the condensation efficiency. Example 4

[0040] Embodiment 3 is an improvement on Embodiment 1. Specifically, the improved EGR mixer further includes: a mixing pipe 40. The mixing pipe 40 is installed on the inner side of the cylinder 21. Both sides are sealed and connected to the air inlet section 10 and the air outlet section 12 respectively. A plurality of air vents 41 are evenly arranged in the middle of the mixing pipe 40.

[0041] After the exhaust gas is condensed, it enters the mixing pipe 40 through the evenly arranged air holes 41 and is mixed with the fresh air, thereby improving the uniformity of the mixing of the exhaust gas and the fresh air.

[0042] The mixing pipe 40 is a venturi tube, including a convergent portion, a throat portion, and a diffuser portion connected in sequence. The pressure at the throat portion is the lowest, making it easier to introduce EGR exhaust gas. Example 5

[0043] Example 5 is an improvement on Example 1, and the improvement includes: the EGR mixer also includes a condensation outer pipe 50 , and the condensation outer pipe 50 includes a Venturi tube, which is installed on the exhaust gas inlet 111 .

[0044] When working, the EGR mixer installs a condensation outer tube 50 on the exhaust gas inlet 111. The gas-liquid specific gravity of the exhaust gas water vapor is different, and the water vapor in the gas phase sinks and separates from the gas, causing changes in pressure drop, temperature, etc., so that the water vapor is condensed and precipitated once, thereby improving the condensation effect of the exhaust gas water vapor.

[0045] Working principle of EGR mixer in this application

[0046] During operation, the exhaust gas is introduced into the mixing section 11 from the exhaust gas inlet 111 through the condensation outer tube 50, the water vapor is condensed and precipitated once, and the remaining hot and humid exhaust gas entering the mixing section 11 encounters the cold medium of the fin 23, the water vapor is condensed and precipitated from the exhaust gas for a second time, and the precipitated condensate is discharged from the liquid outlet 112. At the same time, fresh air is introduced into the EGR mixer from the intake section 10, mixed with the remaining exhaust gas passing through the through hole 24 and the vent hole 41, and finally discharged through the exhaust section 12. This device can prevent water vapor from entering the cylinder and avoid corrosion to engine components.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "includes..." do not exclude the existence of other identical elements in the article or device including the elements.

[0048] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. The utility model is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, and all should be included in the scope of the claims of the utility model.

Claims

1. An EGR mixer, comprising an intake section (10), a mixing section (11), and an outlet section (12) which are connected in sequence, wherein an exhaust gas inlet (111) is provided on the top side of the mixing section (11), and a liquid outlet (112) is provided on the bottom side, characterized in that: The mixing section (11) further comprises a liquid condenser (20) installed in the mixing section (11); The liquid condenser (20) comprises a cylinder (21), both sides of which are sealedly connected to the inner wall of the mixing section (11) via partitions (22), a plurality of fins (23) arranged in parallel are evenly arranged on the cylinder (21), and evenly arranged through holes (24) are opened on the cylinder (21) between two adjacent fins (23).

2. The EGR mixer according to claim 1, characterized in that: A cooling device (30) is fixed on one side of the liquid condenser (20); the fins (23), the cylinder (21), and the partition (22) are all made of heat-conducting materials.

3. The EGR mixer according to claim 2, characterized in that: The cooling device (30) comprises a cooling passage (31), and the cooling passage (31) is in a disc shape and is arranged on the side of the partition plate (22).

4. The EGR mixer according to claim 2, characterized in that: The through hole (24) is opened on a side away from the exhaust gas inlet (111), and occupies 2 / 5 to 3 / 5 of the side surface area of ​​the cylinder (21).

5. The EGR mixer according to claim 1, characterized in that: The EGR mixer also includes: A mixing pipe (40), the mixing pipe (40) being installed inside the cylinder (21), with two sides respectively being sealed and connected to the air inlet section (10) and the air outlet section (12), and a plurality of vent holes (41) being evenly arranged in the middle of the mixing pipe (40).

6. The EGR mixer according to claim 1, characterized in that: The EGR mixer further comprises a condensation outer pipe (50), wherein the condensation outer pipe (50) comprises a venturi tube and is mounted on the exhaust gas inlet (111).

7. The EGR mixer according to claim 1, characterized in that: The EGR mixer also includes a control valve (113) mounted on the liquid outlet (112).

8. The EGR mixer according to claim 1, characterized in that: The mixing section (11) is sealed and assembled with the air inlet section (10) and the air outlet section (12) via a flange (60).

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