An EGR system with an exhaust valve and a drain valve

Abstract

This utility model discloses an EGR system with an exhaust valve and a drain valve, belonging to the field of engine technology. It solves the problem that air in the EGR cooler's cooling water can easily affect cooling efficiency and pose a risk of freezing and cracking in winter, thus affecting the normal operation of the EGR system. This EGR system with an exhaust valve and a drain valve includes an EGR cooler. The input end of the EGR cooler is equipped with an EGR valve intake connection pipe, one end of which is equipped with an exhaust pipe. An EGR valve is installed between the EGR cooler and the EGR valve intake connection pipe. The output end of the EGR cooler is equipped with a corrugated connection pipe, one end of which is equipped with an intake pipe, and the other end of the intake pipe is equipped with an intake manifold. A throttle valve is installed on the intake pipe. This utility model's EGR system with an exhaust valve and a drain valve ensures the normal operation of the EGR system.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically, it relates to an EGR system with an exhaust valve and a drain valve. Background Technology

[0002] The role of the EGR cooler in the EGR system is to reduce the temperature of the exhaust gas participating in the recirculation, thereby reducing the peak temperature of the combustion chamber and inhibiting the formation of nitrogen oxides.

[0003] There are two types of EGR coolers: shell-and-tube and plate-fin. Shell-and-tube EGR coolers have better resistance to thermal stress, but poorer resistance to carbon buildup and corrosion. Their heat dissipation performance is worse than that of plate-fin EGR coolers for the same heat dissipation area, but their cost is relatively lower. On the other hand, plate-fin EGR coolers have poorer resistance to thermal stress, but better resistance to carbon buildup and corrosion. Their heat dissipation performance is better than that of shell-and-tube EGR coolers for the same heat dissipation area.

[0004] Currently, most engines use plate-mounted EGR coolers. However, since EGR coolers require water for cooling, there is a possibility of air being carried in the water flow, which can affect cooling efficiency. In addition, there is a risk of the EGR cooler freezing and cracking in winter, which can affect the normal operation of the EGR system. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art by providing an EGR system with an exhaust valve and a drain valve, which can remove air from the water circuit of the EGR cooler, improve cooling efficiency, and allow the EGR cooler to drain water in low-temperature areas to prevent it from freezing and cracking, ensuring the normal operation of the EGR cooler, effectively extending its service life, and ensuring the normal operation of the EGR system.

[0006] The technical solution of this utility model is as follows: An EGR system with an exhaust valve and a drain valve includes an EGR cooler. The input end of the EGR cooler is provided with an EGR valve inlet connection pipe, and one end of the EGR valve inlet connection pipe is provided with an exhaust pipe. An EGR valve is provided between the EGR cooler and the EGR valve inlet connection pipe. The output end of the EGR cooler is provided with a corrugated connection pipe, one end of the corrugated connection pipe is provided with an intake pipe, and one end of the intake pipe is provided with an intake pipe. A throttle valve is provided on the intake pipe. An exhaust valve is provided on the upper left side of the EGR cooler. A drain valve is provided on the lower middle side of the EGR cooler. A return water pipe is also provided on the top of the EGR cooler, and a water inlet pipe is provided on the bottom of the EGR cooler.

[0007] As a further improvement, the corrugated connecting pipe includes a corrugated pipe and two connecting branches, one end of which is connected to the output end of the EGR cooler, and the other end of which is connected to the intake pipe. The corrugated pipe is installed between the two connecting branches and connects the two connecting branches.

[0008] Furthermore, the connecting branch pipe is provided with a first mounting bracket, which is detachably mounted on the engine.

[0009] Furthermore, the exhaust valve is arranged at an upward angle.

[0010] Furthermore, a filter is provided on the water inlet pipe below the drain valve, and the filter is provided with at least one second mounting bracket, which is detachably mounted on the EGR cooler.

[0011] Furthermore, the drain valve extends to the outside of the filter, and the outer wall surface of the drain valve is in contact with the outer wall surface of the filter.

[0012] Furthermore, the inlet pipe is provided with an inlet branch pipe connected to it, one end of which is connected to the EGR valve. The EGR valve is also provided with a return branch pipe, one end of which is connected to the return pipe.

[0013] Furthermore, the bends of the inlet pipe, inlet branch pipe, return pipe, and return branch pipe are all rounded transition structures.

[0014] Beneficial effects

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] This utility model discloses an EGR system with an exhaust valve and a drain valve. An exhaust valve is provided on the upper left side of the EGR cooler to remove air from the water circuit and improve the cooling efficiency of the EGR cooler body. A drain valve is provided on the lower middle side of the EGR cooler to drain water from the EGR cooler in low-temperature areas, preventing the EGR cooler from freezing and cracking, ensuring the normal operation of the EGR cooler, effectively extending its service life, and ensuring the normal operation of the EGR system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0020] Among them: 1-corrugated connecting pipe, 2-return water pipe, 3-exhaust pipe, 4-EGR valve intake connecting pipe, 5-return water branch pipe, 6-exhaust valve, 7-EGR valve, 8-EGR cooler, 9-inlet water pipe, 10-drain valve, 11-throttle valve, 12-inlet pipe, 13-inlet pipe, 14-inlet water branch pipe, 15-first mounting bracket, 16-second mounting bracket, 17-connecting branch pipe, 18-corrugated pipe, 19-filter, 20-fixing plate. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0022] See Figure 1-3 An EGR system with an exhaust valve and a drain valve includes an EGR cooler 8 mounted on the engine block. The EGR cooler 8 has an EGR valve intake connection pipe 4 at its input end, an exhaust pipe 3 at one end of the intake connection pipe 4, an EGR valve 7 between the EGR cooler 8 and the intake connection pipe 4, a corrugated connection pipe 1 at its output end, an intake pipe 12 communicating with the corrugated connection pipe 1, an intake pipe 13 at one end of the intake pipe 12, and a throttle valve 11 on the intake pipe 12. An exhaust valve 6 is located on the upper left side of the EGR cooler 8, which is the highest point in the EGR cooler 8's water passage. Positioning the exhaust valve 6 at this location allows air to be expelled from the EGR cooler 8's water passage, improving the cooling effect of the EGR cooler 8. A drain valve 10 is located on the lower middle part of the EGR cooler 8. The lowest point in the water circuit of the EGR cooler 8 is located on the lower middle side of the EGR cooler 8. The drain valve 10 is set at this position to drain all the coolant in the water circuit of the EGR cooler 8. The top of the EGR cooler 8 is also equipped with a return water pipe 2, and the bottom of the EGR cooler 8 is equipped with a water inlet pipe 9. One end of the water inlet pipe 9 is connected to the engine oil cooler, and one end of the return water pipe 2 is connected to the engine thermostat. The coolant of the EGR cooler 8 is drawn from the oil cooler, passes through the EGR cooler 8, and returns to the thermostat through the return water pipe 2. The middle part of the return water pipe 2 bypasses the exhaust pipe 3 and connects to the engine thermostat to avoid positional interference between the return water pipe 2 and other components during installation. The outer wall of the exhaust pipe 3 is equipped with an arc-shaped plate 20 that is adapted to the circumference of the return water pipe 2, and the depth of the arc-shaped plate 20 is less than the radius of the return water pipe 2. The return water pipe 2 is movably inserted into the arc-shaped plate 20 to further improve the firmness of the return water pipe 2.

[0023] The exhaust gas from the lower side of the exhaust pipe 3 and the afterburning exhaust gas enter the EGR valve 7 through the EGR valve intake connection pipe 4. The opening degree of the EGR valve 7 is controlled by the EGR valve to control the EGR rate. Then the exhaust gas enters the EGR cooler 8 for cooling, and then enters the intake pipe 12 through the corrugated connection pipe 1, and then enters the intake pipe 13 for re-combustion. An exhaust valve 6 is provided on the upper left side of the EGR cooler 8 to remove air from the water circuit and improve the cooling efficiency of the EGR cooler body 8. In addition, a drain valve 10 is provided on the lower middle part of the EGR cooler 8, which can drain water from the EGR cooler 8 in low-temperature areas to prevent the EGR cooler 8 from freezing and cracking, ensure the normal operation of the EGR cooler 8, and effectively extend its service life.

[0024] In this embodiment, the corrugated connecting pipe 1 includes a corrugated pipe 18 and two connecting branch pipes 17. One end of one connecting branch pipe 17 is connected to the output end of the EGR cooler 8, and one end of the other connecting branch pipe 17 is connected to the intake pipe 12. The corrugated pipe 18 is installed between the two connecting branch pipes 17 and connects the two connecting branch pipes 17. The two connecting branch pipes 17 are connected by the corrugated pipe 18. The corrugated pipe 18 has a certain degree of flexibility, which can avoid other components during installation according to the actual situation, avoid positional interference between the corrugated connecting pipe 1 and other components during installation, and expand the error range during the manufacturing of the connecting branch pipes 17, thus expanding the scope of use.

[0025] In this embodiment, a first mounting bracket 15 is provided on the connecting branch pipe 17. The first mounting bracket 15 is detachably mounted on the engine. The first mounting bracket 15 is mounted on the engine cylinder block by bolt connection, which facilitates the maintenance of the connecting branch pipe 17 and the bellows 18.

[0026] In this embodiment, the exhaust valve 6 is arranged at an upward angle, so that the opening of the exhaust valve 6 is arranged at an upward angle. When the exhaust valve 6 exhausts gas, it can prevent the gas discharged from the exhaust valve 6 from impacting other parts of the engine. In addition, the gas discharged from the exhaust valve 6 contains moisture, which can prevent it from affecting other parts.

[0027] In this embodiment, a filter 19 is provided on the water inlet pipe 9 below the drain valve 10. The filter 19 further filters the cooling water in the water inlet pipe 9. The filter 19 is provided with at least one second mounting bracket 16. The second mounting bracket 16 is detachably mounted on the EGR cooler 8. There are two second mounting brackets 16. The two second mounting brackets 16 are connected by bolts and mounted on the EGR cooler 8. This mounting method facilitates the maintenance of the filter 19.

[0028] In this embodiment, the drain valve 10 extends to the outside of the filter 19 to facilitate the discharge of the drain valve 10 and prevent the coolant from flowing down onto the engine block and affecting it when the drain valve 10 discharges the coolant from the EGR cooler 8; and the outer wall of the drain valve 10 is in contact with the outer wall of the filter 19, so the filter 19 provides support for the drain valve 10.

[0029] In this embodiment, the inlet pipe 9 is provided with an inlet branch pipe 14 connected to it, and the connection between the inlet pipe 9 and the inlet branch pipe 14 is located on one side of the output end of the filter 19; one end of the inlet branch pipe 14 is connected to the EGR valve 7, and the EGR valve 7 is also provided with a return branch pipe 5, one end of the return branch pipe 5 is connected to the return pipe 2, and the EGR valve is connected to the inlet branch pipe 14 and the return branch pipe 4, so that cooling water enters the EGR valve 7, further improving the cooling effect of the EGR cooler 8.

[0030] Preferably, the connection between the return water branch pipe 5 and the return water pipe 2 is located on one side of the arc plate 20, which further improves the firmness of the return water pipe 2 and the return water branch pipe 5.

[0031] In this embodiment, the bends of the inlet pipe 9, the inlet branch pipe 17, the return pipe 2, and the return branch pipe 17 are all rounded transition structures to prevent water from remaining at the bends of the inlet pipe 9, the inlet branch pipe 17, the return pipe 2, and the return branch pipe 17. In low-temperature environments, the water in the pipes will freeze into ice, causing blockage of the conduits and thus affecting the cooling effect of the EGR cooler 8 and the EGR valve 7.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. An EGR system with an exhaust valve and a drain valve, characterized in that, The system includes an EGR cooler (8), with an EGR valve intake connection pipe (4) at the input end of the EGR cooler (8), an exhaust pipe (3) at one end of the EGR valve intake connection pipe (4), an EGR valve (7) between the EGR cooler (8) and the EGR valve intake connection pipe (4), a corrugated connection pipe (1) at the output end of the EGR cooler (8), an intake pipe (12) at one end of the corrugated connection pipe (1), an intake pipe (13) at one end of the intake pipe (12), a throttle valve (11) on the intake pipe (12), an exhaust valve (6) on the upper left side of the EGR cooler (8), a drain valve (10) on the lower middle side of the EGR cooler (8), a return water pipe (2) at the top of the EGR cooler (8), and an inlet pipe (9) at the bottom of the EGR cooler (8).

2. The EGR system with an exhaust valve and a drain valve according to claim 1, characterized in that, The corrugated connecting pipe (1) includes a corrugated pipe (18) and two connecting branch pipes (17). One end of one of the connecting branch pipes (17) is connected to the output end of the EGR cooler (8), and one end of the other connecting branch pipe (17) is connected to the intake pipe (12). The corrugated pipe (18) is installed between the two connecting branch pipes (17) and connects the two connecting branch pipes (17).

3. The EGR system with an exhaust valve and a drain valve according to claim 2, characterized in that, The connecting branch pipe (17) is provided with a first mounting bracket (15), which is detachably mounted on the engine.

4. The EGR system with an exhaust valve and a drain valve according to claim 1, characterized in that, The exhaust valve (6) is arranged at an upward angle.

5. An EGR system with an exhaust valve and a drain valve according to claim 1, characterized in that, A filter (19) is provided on the water inlet pipe (9) below the drain valve (10). The filter (19) is provided with at least one second mounting bracket (16), which is detachably mounted on the EGR cooler (8).

6. An EGR system with an exhaust valve and a drain valve according to claim 5, characterized in that, The drain valve (10) extends to the outside of the filter (19), and the outer wall surface of the drain valve (10) is in contact with the outer wall surface of the filter (19).

7. An EGR system with an exhaust valve and a drain valve according to claim 1, characterized in that, The inlet pipe (9) is provided with an inlet branch pipe (14) connected to it. One end of the inlet branch pipe (14) is connected to the EGR valve (7). The EGR valve (7) is also provided with a return branch pipe (5). One end of the return branch pipe (5) is connected to the return pipe (2).

8. An EGR system with an exhaust valve and a drain valve according to claim 7, characterized in that, The bends of the water inlet pipe (9), water inlet branch pipe (14), water return pipe (2), and water return branch pipe (5) are all rounded transition structures.

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