Exhaust gas collecting and treating device for EGR (Exhaust Gas Recirculation)

Abstract

The exhaust gas collecting and processing device for EGR comprises an air cooler, one side of the air cooler is connected with a water-gas separator, the other side of the water-gas separator is connected with a gas storage tank, a water storage tank is arranged at the bottom of the water-gas separator and the bottom of the gas storage tank, and the bottom of the water-gas separator and the bottom of the gas storage tank are both communicated with the water storage tank; and a Tesla valve is arranged in the air cooler. According to the device, the Tesla valve is arranged in the air cooler, the tail gas inlet of the Tesla valve is connected with engine tail gas, and meanwhile, the cooling water inlet of the air cooler is connected with an engine cooling system, so that when the engine tail gas passes through the Tesla valve, the flowing process of the tail gas is more stable by utilizing the one-way flowing characteristic of the Tesla valve; and meanwhile, cooling and water-gas separation work are completed in the process that tail gas enters the separation tank body, the EGR gas source quality is greatly improved, the EGR control strategy and EMS calibration work are greatly simplified, and in practical application, an engine system runs more stably and smoothly.

Description

Technical Field

[0001] This invention relates to the field of waste gas recirculation and treatment technology, specifically to an EGR exhaust gas collection and treatment device. Background Technology

[0002] EGR, short for Exhaust Gas Recirculation, refers to the process of returning a portion of the exhaust gases from the engine to the intake manifold, where they are mixed with fresh air and re-enter the cylinders. Because the exhaust gases contain a large amount of polyatomic gases such as CO2, which are non-combustible but absorb a significant amount of heat due to their high specific heat capacity, the maximum combustion temperature of the air-fuel mixture in the cylinder is lowered, thereby reducing NOx formation. An internal combustion engine is a type of power machinery that converts the heat energy released from the combustion of fuel within the engine into power.

[0003] EGR stands for Engine Exhaust Gas Recirculation. Its main function is to reduce the combustion temperature in the engine cylinders and reduce engine fuel consumption. The exhaust gas emitted by internal combustion engines has a large range and high frequency of pressure fluctuations, as well as high gas temperature and high humidity. Current technology only cools the gas and directly supplies it to the engine for recycling through the EGR valve. This requires the addition of corresponding sensors and complex EGR control components, which not only results in unstable control effects but also increases calibration work and development costs. Summary of the Invention

[0004] The purpose of this invention is to provide an exhaust gas collection and treatment device for EGR, so as to solve the problem of complex and unstable engine exhaust gas recirculation control mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an EGR exhaust gas collection and treatment device, including an air cooler, a water-gas separator connected to one side of the air cooler, a gas storage tank connected to the other side of the water-gas separator, a water storage tank provided at the bottom of the water-gas separator and the gas storage tank, and the bottom of the water-gas separator and the gas storage tank are both connected to the water storage tank.

[0006] The air cooler is equipped with a Tesla valve. The Tesla valve has an exhaust gas inlet and an exhaust gas outlet on both sides. One end of the exhaust gas inlet is connected to the engine exhaust pipe to take exhaust gas, and the other end of the exhaust gas outlet is connected to the separator tank.

[0007] Preferably, both the water-gas separator and the gas storage tank are hollow structures, and their upper ends are connected to each other. The other side of the gas storage tank is also provided with an exhaust port.

[0008] Preferably, the gas storage tank includes a gas storage tank body, and the bottom of the gas storage tank body is also provided with a water-proof plate to prevent communication with the water storage tank.

[0009] Preferably, the water-air separator includes a separation tank, and a float ball is provided at the bottom of the separation tank.

[0010] Preferably, the bottom of the water storage tank is equipped with an automatic drain valve, and the automatic drain valve is connected to a float ball at the bottom of the tank via a lever mechanism.

[0011] Preferably, the float is a hollow structure.

[0012] Preferably, both the separation tank and the gas storage tank are provided with a guide channel at the top, and a cylindrical filter screen is provided at the bottom of the guide channel.

[0013] Preferably, the guide channel has a funnel-shaped structure with an opening in the middle. Its two ends are fixed to the inner walls of the separation tank and the gas storage tank, and a filter screen is connected to the bottom opening.

[0014] Preferably, the water-blocking plate is inverted conical in shape, and its surface is provided with through holes.

[0015] Preferably, the air cooler is provided with a cooling water inlet and a cooling water outlet on its top and bottom sides, respectively.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) This device can not only filter the moisture in the exhaust gas, cool and dry the exhaust gas, but also keep the pressure of the exhaust gas stable during storage, eliminating the influence of engine exhaust gas pressure fluctuations.

[0018] (2) This device connects the exhaust gas inlet of the Tesla valve to the engine exhaust gas by installing a Tesla valve inside the air cooler, and connects the cooling water inlet of the air cooler to the engine cooling system. At the same time, it connects the separator tank to the outlet of the Tesla valve, so that the exhaust gas can be made more stable when passing through the Tesla valve by utilizing the unidirectional flow characteristics of the Tesla valve. At the same time, the exhaust gas can be cooled and separated into water and gas as it enters the separator tank, which greatly improves the quality of EGR gas source and greatly simplifies the EGR control strategy and EMS calibration. In actual application, the engine system runs more stably and smoothly.

[0019] (3) The water-air separator of this device consists of a guide channel, a filter screen, an automatic drain valve, and a separation tank. It can effectively separate the cooled exhaust gas from the water inside. Excess water floats the float ball of the automatic drain valve. Under the action of buoyancy, the float ball opens the automatic drain valve to realize automatic drainage, making the exhaust gas dry. At the same time, it can further cool the exhaust gas. When the water level drops to a certain height, the float ball and the lever mechanism automatically reset, thereby automatically closing the automatic drain valve to prevent exhaust gas leakage.

[0020] (4) The gas storage tank of this device stores the treated exhaust gas and can further remove water and reduce the temperature of the exhaust gas. Combined with the unidirectional flow characteristics of the Tesla valve in the air cooler, it can keep the pressure of the exhaust gas in the storage tank stable and eliminate the influence of engine exhaust gas pressure fluctuation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an EGR exhaust gas collection and treatment device according to the present invention;

[0022] Figure 2 This is a cross-sectional view of the air cooler of an EGR exhaust gas collection and treatment device according to the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the gas storage tank and water-gas separator of an EGR exhaust gas collection and treatment device according to the present invention.

[0024] Figure 4 This is a top view of an EGR exhaust gas collection and treatment device according to the present invention.

[0025] In the diagram: 1. Air cooler; 2. Cooling water inlet; 3. Air tank; 31. Air tank body; 32. Water baffle; 4. Water tank; 5. Water-air separator; 51. Separator body; 52. Automatic drain valve; 53. Lever mechanism; 54. Float; 6. Cooling water outlet; 7. Exhaust gas inlet; 8. Exhaust outlet; 9. Tesla valve; 10. Exhaust gas outlet; 11. Guide channel; 12. Filter screen. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-4 The present invention provides a technical solution: an EGR exhaust gas collection and treatment device, including an air cooler 1, a water-gas separator 5 connected to one side of the air cooler 1, a gas storage tank 3 connected to the other side of the water-gas separator 5, a water storage tank 4 provided at the bottom of the water-gas separator 5 and the gas storage tank 3, and the bottom of the water-gas separator 5 and the gas storage tank 3 are both connected to the water storage tank 4.

[0028] The air cooler 1 is equipped with a Tesla valve 9. The air cooler 1 is welded together with the Tesla valve 9 and a water jacket. The Tesla valve 9 is provided with an exhaust gas inlet 7 and an exhaust gas outlet 8 on both sides. One end of the exhaust gas inlet 7 is connected to the engine exhaust pipe to take exhaust gas. One side of the exhaust gas outlet 8 is connected to the separator tank 51. The top and bottom sides of the air cooler 1 are provided with a cooling water inlet 2 and a cooling water outlet 6, respectively. The cooling water used by the air cooler 1 is connected to the engine cooling system. The water-gas separator 5 and the air tank 3 are both hollow structures, and their upper ends are connected to each other. The other side of the air tank 3 is also provided with an exhaust gas outlet 10. This structure allows the air cooler 1 to forcibly cool the high-temperature exhaust gas in the Tesla valve 9. The hot exhaust gas enters the water-gas separator 5 after being cooled in the Tesla valve 9.

[0029] The gas storage tank 3 includes a gas storage tank body 31, and the water-gas separator 5 includes a separation tank body 51. A float ball 54 is also provided at the bottom of the separation tank body 51. An automatic drain valve 52 is provided at the bottom of the water storage tank 4. The automatic drain valve 52 is connected to the float ball 54 at the bottom of the separation tank body 51 via a lever mechanism 53. The float ball 54 is a hollow structure. Both the separation tank body 51 and the gas storage tank 31 have guide channels 11 at their top positions. A cylindrical filter screen 12 is provided at the bottom of the guide channels 11. The guide channels 11 are funnel-shaped with an opening in the middle. Both ends are fixed to the inner walls of the separation tank body 51 and the gas storage tank 31. The filter screen 12 is externally connected to the bottom opening. This structure effectively separates the cooled exhaust gas from the Tesla valve 9 from the water inside, making the exhaust gas drier and further cooling it. Excess water flows naturally down the separation tank body 51 through the inner wall of the separation tank body 51, the guide channels 11, and the filter screen 12. The water enters the water storage tank 4. When there is a lot of water in the water storage tank 4, the float ball 54 of the automatic drain valve 52 will float. Under the action of buoyancy, the float ball 54 opens the automatic drain valve 52 to realize the automatic drainage of water in the water storage tank 4. When the water level drops, the automatic drain valve 52 closes in time to effectively prevent exhaust gas leakage. The bottom of the gas storage tank 31 is also provided with a water baffle plate 32 to block the connection with the water storage tank 4. The water baffle plate 32 is inverted cone shape and its surface is provided with through holes. The gas storage tank 3 stores the exhaust gas treated by the water-gas separator 5, and can further reduce the temperature of the exhaust gas and remove water. After the exhaust gas treated by the water-gas separator 5 enters the gas storage tank 31, the remaining water in the exhaust gas will also flow naturally to the lower part of the gas storage tank 31 through the inner wall of the gas storage tank 31, the guide groove 11 and the filter screen 12, and then enter the water storage tank 4 through the through holes on the surface of the water baffle plate 32. Finally, the treated exhaust gas is discharged through the exhaust gas exhaust port 10.

[0030] Working principle: When using this EGR exhaust gas collection and treatment device, the engine exhaust gas first enters the Tesla valve 9 through the exhaust gas inlet 7, while the engine coolant enters the air cooler 1 through the coolant inlet 2. The coolant inside the air cooler 1 forcibly cools the exhaust gas passing through the Tesla valve 9, and then discharges it from the coolant outlet 6. The exhaust gas passing through the Tesla valve 9 enters the separator tank 51 through the outlet 8. When the exhaust gas enters the separator tank 51, the moisture in the exhaust gas comes into contact with the inner wall of the separator tank 51, the guide channel 11, and the filter screen 12, and then flows naturally to the bottom of the separator tank 51 and enters the water storage tank 4. The exhaust gas then enters the gas storage tank 31. After entering the gas storage tank 31, the remaining moisture in the exhaust gas will also come into contact with the inner wall of the gas storage tank 31, the guide groove 11, and the filter screen 12, and then flow to the bottom of the gas storage tank 31. After passing through the through holes on the surface of the water baffle 32, it finally flows into the water storage tank 4, and the exhaust gas is discharged from the exhaust port 10. When there is a lot of water in the water storage tank 4, the float ball 54 on the automatic drain valve 52 will float up, and the automatic drain valve 52 will be opened through the lever mechanism 53, thereby automatically draining the water in the water storage tank 4. When the water level drops, the float ball 54 will fall down, causing the automatic drain valve 52 to close in time, effectively preventing exhaust gas leakage, thus completing a series of operations.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An EGR exhaust gas collection and treatment device, comprising an air cooler (1), characterized in that: The air cooler (1) is connected to a water-gas separator (5) on one side and a gas storage tank (3) on the other side. The water-gas separator (5) and the gas storage tank (3) are provided with a water storage tank (4) at the bottom, and the bottom of the water-gas separator (5) and the gas storage tank (3) are connected to the water storage tank (4). The air cooler (1) is equipped with a Tesla valve (9). The Tesla valve (9) has an exhaust gas inlet (7) and an exhaust gas outlet (8) on both sides. One end of the exhaust gas inlet (7) is connected to the engine exhaust pipe to take exhaust gas, and one side of the exhaust gas outlet (8) is connected to the separator (51).

2. The exhaust gas collection and treatment device for EGR according to claim 1, characterized in that: The water-air separator (5) and the gas storage tank (3) are both hollow structures, and their upper ends are connected to each other. The other side of the gas storage tank (3) is also provided with an exhaust port (10).

3. The exhaust gas collection and treatment device for EGR according to claim 2, characterized in that: The gas storage tank (3) includes a gas storage tank body (31), and a water-blocking plate (32) is provided at the bottom of the gas storage tank body (31) to prevent communication with the water storage tank (4).

4. The exhaust gas collection and treatment device for EGR according to claim 3, characterized in that: The water-air separator (5) includes a separation tank (51), and a float (54) is provided at the bottom of the separation tank (51).

5. The exhaust gas collection and treatment device for EGR according to claim 4, characterized in that: The bottom of the water storage tank (4) is equipped with an automatic drain valve (52), and the automatic drain valve (52) is connected to the float (54) at the bottom of the separation tank (51) through a lever mechanism (53).

6. The exhaust gas collection and treatment device for EGR according to claim 5, characterized in that: The float (54) is a hollow structure.

7. The exhaust gas collection and treatment device for EGR according to claim 6, characterized in that: Both the separation tank (51) and the gas storage tank (31) are provided with a guide channel (11) at the top, and a cylindrical filter screen (12) is provided at the bottom of the guide channel (11).

8. The exhaust gas collection and treatment device for EGR according to claim 7, characterized in that: The guide channel (11) is a funnel-shaped structure with an opening in the middle. Its two ends are fixed to the inner walls of the separation tank (51) and the gas storage tank (31), and a filter screen (12) is connected to the bottom opening.

9. The exhaust gas collection and treatment device for EGR according to claim 3, characterized in that: The water-blocking plate (32) is inverted cone shape, and its surface is provided with through holes.

10. An EGR exhaust gas collection and treatment device according to any one of claims 1-9, characterized in that: The air cooler (1) is provided with a cooling water inlet (2) and a cooling water outlet (6) on its top and bottom sides, respectively.

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