EGR cooler capable of filtering water

Abstract

The invention discloses an EGR cooler capable of filtering water, belongs to the technical field of engine EGR systems, and solves the problem that water in exhaust gas of an existing EGR system easily enters a cylinder to damage the cylinder. The waste gas cooler comprises a shell and a cooler core, the cooler core is installed in the shell, a gas inlet cover and a gas outlet cover are arranged at the two ends of the shell respectively, the size of the gas inlet cover and the size of the gas outlet cover are gradually reduced along the end away from the shell, and an MOFs film used for filtering water vapor in waste gas is arranged in the gas outlet cover. A water drain valve communicated with the MOFs thin film is arranged at the bottom of the shell on the rear side of the MOFs thin film, and the bottom surface between the MOFs thin film and the water drain valve is a step surface which is concave downwards along one side of the air inlet cover. According to the EGR cooler, the MOFs film is used for filtering water, the water is prevented from returning into the air cylinder, and the service life of an engine is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of engine EGR system technology, and more specifically, to an EGR cooler capable of filtering water. Background Technology

[0002] Exhaust gas recirculation (EGR) refers to the process of returning a portion of the exhaust gas from the engine to the intake manifold, where it is mixed with fresh air and re-enters the cylinders. The EGR cooler, a crucial component of EGR, primarily uses water cooling to lower the high-temperature exhaust gas to a suitable temperature before reintroducing it into the combustion chamber. Its core function is to suppress the formation of nitrogen oxides (NOx) by reducing the combustion chamber temperature. The increased density of the cooled exhaust gas reduces dilution of fresh air and enhances carbon dioxide oxidation, further reducing emissions.

[0003] During engine operation, it is unavoidable to draw in air containing moisture into the cylinder. When the cylinder exhausts, the moisture is discharged with the exhaust gas. Some of it is discharged directly into the atmosphere after after-treatment, while the other part returns to the cylinder through the exhaust gas recirculation system. When the temperature of the water vapor in the exhaust gas cooler decreases, it gradually condenses into liquid water. As the amount of water accumulates, it eventually enters the intake manifold and is distributed to each cylinder. This can lead to a decrease in combustion efficiency or, in severe cases, engine misfire.

[0004] Therefore, there is an urgent need to design an EGR cooler that can filter water to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art by providing an EGR cooler that can filter water, using MOFs membrane to filter water, preventing water from returning to the cylinder, and effectively extending the service life of the engine.

[0006] The technical solution of the present invention is as follows: an EGR cooler capable of filtering moisture includes a shell and a cooler core, wherein the cooler core is installed inside the shell, and an air inlet hood and an air outlet hood are respectively provided at both ends of the shell, the size of the air inlet hood and the air outlet hood gradually decreases along the end away from the shell, and a MOFs membrane for filtering water vapor in the exhaust gas is provided inside the air outlet hood, and a drain valve communicating with the bottom of the shell behind the MOFs membrane is provided, wherein the bottom surface between the MOFs membrane and the drain valve is a stepped surface that is concave downward along one side of the air inlet hood.

[0007] As a further improvement, the outer casing is equipped with an inlet pipe and an outlet pipe for the cooler core at both ends.

[0008] Furthermore, the outer casing is provided with a mounting base for installing a temperature sensor at one end near the vent hood.

[0009] Furthermore, the inlet hood and outlet hood are each provided with a connecting flange at the end furthest from the outer casing.

[0010] Furthermore, the air intake hood, air exhaust hood, and outer shell are detachably connected.

[0011] Furthermore, the outer casing is also provided with a mounting bracket.

[0012] Furthermore, the MOF film is detachably installed inside the exhaust hood.

[0013] Furthermore, a heating wire is installed inside the vent hood on the rear side of the MOF film.

[0014] Furthermore, the exhaust hood on the rear side of the MOF film is also provided with an exhaust pipe connected to it, and the exhaust pipe is provided with a first valve.

[0015] Furthermore, the exhaust pipe is connected to the exhaust fan, and the exhaust hood is also equipped with an air inlet pipe, which is equipped with a second valve.

[0016] Beneficial effects Compared with the prior art, the present invention has the following advantages: The EGR cooler of this invention adds a MOFs film to the outlet end of the EGR cooler and sets a drain valve at the bottom of the outer casing. The adjustable pore structure of the film can filter water vapor in the exhaust gas. The exhaust gas can return to the cylinder through the film to participate in combustion again, while the water vapor is blocked by the film and stays in the cooler, preventing water from returning to the cylinder. When the water vapor condenses into liquid, it can be discharged through the drain valve, effectively extending the service life of the engine. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure of Embodiment 1 of the present invention; Figure 3 This is an enlarged cross-sectional view of the air hood in Embodiment 2 of the present invention; Figure 4 This is an enlarged cross-sectional view of the air hood in Embodiment 3 of the present invention.

[0018] The components are: 1-outer shell, 2-cooler core, 3-inlet hood, 4-outlet hood, 5-MOFs membrane, 6-drain valve, 7-inlet pipe, 8-outlet pipe, 9-mounting base, 10-connecting flange, 11-mounting bracket, 12-heating wire, 13-exhaust pipe, 14-first valve, 15-exhaust fan, 16-inlet pipe, 17-second valve. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0020] Example 1 See Figure 1-2 This invention discloses an EGR cooler capable of filtering moisture, comprising a housing 1 and a cooler core 2, wherein the cooler core 2 is installed inside the housing 1. An inlet hood 3 and an outlet hood 4 are respectively provided at both ends of the housing 1. A water inlet pipe 7 and an outlet pipe 8 are respectively installed at both ends of the housing 1 to connect with the cooler core 2, constituting an EGR cooler in the prior art. Cooling water enters through the inlet pipe 7 and exits through the outlet pipe 8, while exhaust gas enters the housing through the inlet hood 3 and exits through the outlet hood 4 into the cylinder. When the exhaust gas comes into contact with the cooler core 2, heat exchange occurs, thereby achieving the purpose of cooling the exhaust gas. The dimensions of the inlet hood 3 and the outlet hood 4 gradually decrease along the end furthest from the housing 1, increasing the volume of the cooler core 2 and the housing 1, thus improving the cooling effect. A MOFs membrane 5 for filtering water vapor in the exhaust gas is provided inside the outlet hood 4. The MOFs membrane 5 is a metal-organic framework material in the prior art, possessing the function of separating and blocking water vapor, which will not be elaborated further here. A drain valve 6, connected to the bottom of the outer casing 1 behind the MOFs membrane 5, is provided to drain water condensed from water vapor. The bottom surface between the MOFs membrane 5 and the drain valve 6 is a stepped surface that is concave downwards along one side of the air inlet shroud 3, which facilitates the collection of water into the drain valve 6. In other embodiments, the bottom surface between the MOFs membrane 5 and the drain valve 6 can also be an inclined surface that is concave downwards along one side of the air inlet shroud 3, which makes drainage even more convenient.

[0021] Preferably, a mounting base 9 for installing a temperature sensor is provided on one end of the outer casing 1 near the exhaust hood 4, so as to facilitate the detection of the temperature of the cooled exhaust gas.

[0022] Preferably, a connecting flange 10 is provided at the end of the air inlet hood 3 and the air outlet hood 4 away from the outer shell 1, which facilitates connection with other pipelines and makes disassembly and assembly convenient.

[0023] Preferably, the air intake hood 3, the air exhaust hood 4 and the outer shell 1 are detachably connected. Specifically, the two can be fixed by flange connection or glue bonding, which further facilitates disassembly and maintenance.

[0024] Preferably, the housing 1 is also provided with a mounting bracket 11 to facilitate further reinforcement with the engine.

[0025] Preferably, the MOFs membrane 5 is detachably installed inside the exhaust hood 4. Specifically, the MOFs membrane 5 can be fastened to the exhaust hood 4 with bolts, making it easy to remove for cleaning and maintenance.

[0026] The EGR cooler of the present invention adds a MOFs film 5 to the outlet end of the EGR cooler and sets a drain valve 6 at the bottom of the outer casing 1. The adjustable pore structure of the film can filter water vapor in the exhaust gas. The exhaust gas can return to the cylinder through the film to participate in combustion again, while the water vapor is blocked by the film and stays in the cooler, preventing water from returning to the cylinder. When the water vapor condenses into liquid, it can be discharged through the drain valve 6, effectively extending the service life of the engine.

[0027] Example 2 See Figure 3 This is another specific embodiment of the present invention, which is basically the same as embodiment 1, except that a heating wire 12 is also installed inside the vent 4 on the rear side of the MOFs film 5. The heating wire 12 can heat the MOFs film 5. Furthermore, an exhaust pipe 13 communicating with the vent 4 on the rear side of the MOFs film 5 is also provided, and a first valve 14 is provided on the exhaust pipe 13. In actual application, after the engine is stopped, the first valve 14 can be opened, and then the heating wire 12 can be energized to heat the MOFs film 5, so that the moisture adsorbed on the MOFs film 5 is dried and discharged through the exhaust pipe 13. The MOFs film 5 can be reused without disassembling it for maintenance, which is very convenient.

[0028] Example 3 See Figure 4 This is another specific embodiment of the present invention. This embodiment is basically the same as embodiment 2, except that the exhaust pipe 13 is connected to the exhaust fan 15, and an air inlet pipe 16 is also provided on the air outlet hood 4, with a second valve 17 on the air inlet pipe 16. When heating the MOFs film 5, the exhaust fan 15 and the second valve 17 can be turned on simultaneously to create a convection state inside the air inlet hood 4. The exhaust fan 15 can quickly extract the water vapor generated by heating, achieving the purpose of quickly maintaining the MOFs film 5.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. An EGR cooler capable of filtering moisture, comprising a housing (1) and a cooler core (2), wherein the cooler core (2) is installed inside the housing (1), and an air inlet hood (3) and an air outlet hood (4) are respectively provided at both ends of the housing (1), characterized in that, The dimensions of the air intake hood (3) and the air outlet hood (4) gradually decrease along the end away from the outer shell (1). The air outlet hood (4) is provided with a MOFs membrane (5) for filtering water vapor in the exhaust gas. The bottom of the outer shell (1) behind the MOFs membrane (5) is provided with a drain valve (6) connected to it. The bottom surface between the MOFs membrane (5) and the drain valve (6) is a stepped surface that is concave downward along one side of the air intake hood (3).

2. The EGR cooler capable of filtering water according to claim 1, characterized in that, The outer shell (1) is equipped with a water inlet pipe (7) and a water outlet pipe (8) for the cooler core (2) at both ends.

3. The EGR cooler capable of filtering water according to claim 1, characterized in that, The outer casing (1) is provided with a mounting base (9) for installing a temperature sensor at one end near the vent hood (4).

4. The EGR cooler capable of filtering water according to claim 1, characterized in that, The air intake hood (3) and air outlet hood (4) are each provided with a connecting flange (10) at the end away from the outer shell (1).

5. An EGR cooler capable of filtering water according to claim 1, characterized in that, The air intake hood (3), air outlet hood (4) and outer shell (1) are detachably connected.

6. The EGR cooler capable of filtering water according to claim 1, characterized in that, The outer casing (1) is also provided with a mounting bracket (11).

7. An EGR cooler capable of filtering water according to any one of claims 1-6, characterized in that, The MOFs film (5) is detachably installed inside the exhaust hood (4).

8. An EGR cooler capable of filtering moisture according to any one of claims 1-6, characterized in that, A heating wire (12) is also installed inside the vent hood (4) on the rear side of the MOF film (5).

9. An EGR cooler capable of filtering water according to claim 8, characterized in that, The exhaust hood (4) on the rear side of the MOFs film (5) is also provided with an exhaust pipe (13) connected to it, and the exhaust pipe (13) is provided with a first valve (14).

10. An EGR cooler capable of filtering water according to claim 9, characterized in that, The exhaust pipe (13) is connected to the exhaust fan (15), and the exhaust hood (4) is also provided with an air inlet pipe (16), and the air inlet pipe (16) is provided with a second valve (17).

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