Hot-end EGR (Exhaust Gas Recirculation) valve

Abstract

The utility model discloses a hot end EGR valve which comprises a valve body, an air inlet and an air outlet are formed in the valve body, and the air inlet is communicated with an air outlet pipe through an air channel. A valve rod, a guide sleeve and a driving module are mounted in the valve body; a sealing module is installed between the top end of the guide sleeve and the valve rod, and a protective sleeve is installed between the bottom end of the guide sleeve and the valve rod. A cooling cavity located on the peripheral sides of the air channel and the guide sleeve is formed in the valve body. The cooling cavity communicates with the water inlet pipe and the water outlet pipe. According to the utility model, the cooling cavity is arranged on the peripheral sides of the air passage and the guide sleeve, so that not only is high-temperature waste gas fully cooled, but also a protective element in the valve body is cooled, the protective element is prevented from being aged and damaged due to high temperature influence, the service life of the valve body is prolonged, and meanwhile, the cooling cavity completely surrounds the peripheral side of the air passage, so that the service life of the valve body is prolonged. High-temperature waste gas in the gas channel can be fully cooled, and the cooling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a hot end EGR valve. Background Art

[0002] The exhaust gas recirculation valve (EGR valve) is an actuator in the EGR system that regulates the exhaust gas recirculation flow rate. The EGR valve is mainly installed between the engine exhaust system and the intake system. Its function is to control a certain amount of exhaust gas to pass through its pipeline to re-enter the combustion chamber to participate in combustion, so as to reduce the emission of harmful substances such as nitrogen oxides and carbon dioxide. At the same time, it can increase the compression ratio to prevent knocking, and make a certain contribution to fuel economy.

[0003] Since the exhaust gas discharged by the engine passes through the inside of the EGR valve, the exhaust gas has a high temperature and contains impurities, which can cause thermal deformation of surrounding components and cause failure, thereby causing the valve to get stuck or leak, resulting in product failure.

[0004] Chinese utility model patent 201921014967X discloses an EGR valve seat with an integrated cooling water jacket, comprising a valve seat body, an exhaust gas inlet, an exhaust gas outlet, a water outlet, a water inlet, an EGR valve mounting seat and an EGR cooler connecting seat arranged on the valve seat body, the exhaust gas inlet is connected to the exhaust gas outlet, and also comprises a cooling water jacket arranged inside the valve seat body, the cross-sectional shape of the cooling water jacket along the air intake direction is an arc shape and the arc length is greater than the arc length of a semicircular arc with the same radius, and is a "C"-shaped structure, one end of the cooling water jacket is connected to the water inlet, and the other end of the cooling water jacket is tangentially connected to the water outlet. The utility model ensures the cooling of the hot end EGR valve and the valve seat, has a compact structure, the coolant surrounds the valve seat and has a fast flow rate, and has a good cooling effect, but only cools the gas flow part, and does not consider the protection of the internal components of the valve seat, so that the internal protection components of the valve body are severely aged and damaged by the high temperature, and the cooling water jacket of the C-shaped structure cannot fully cool the gas flow part inside the valve seat, and the cooling effect is not good enough. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a hot-end EGR valve, which can reduce the high-temperature aging of protective elements inside the valve body, improve the cooling efficiency, and extend the service life of the valve body.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0007] The hot-end EGR valve comprises a valve body, on which an air inlet and an air outlet are respectively arranged, and the air inlet and the air outlet pipe are connected through an air passage; a valve stem, a guide sleeve and a driving module are installed inside the valve body, the driving module is connected to the valve stem and drives the valve stem to move, and the guide sleeve is slidably assembled with the valve stem; a sealing module is installed between the top end of the guide sleeve and the valve stem, and a sheath is installed between the bottom end of the guide sleeve and the valve stem; a cooling cavity is arranged inside the valve body, which is located at the air passage and the peripheral side of the guide sleeve, and the cooling cavity is respectively connected with the water inlet pipe and the water outlet pipe.

[0008] The above-mentioned hot end EGR valve, the cooling cavity is formed by enclosing an annular cooling wall, a first cover plate, and a second cover plate arranged on the periphery of the valve body, the two opposite ends of the cooling wall are open, and flange seats are respectively provided at the open ends of the cooling wall, one of the flange seats is connected to the first cover plate by bolts, and the other flange seat is connected to the second cover plate by bolts.

[0009] The hot end EGR valve is provided with sealing rings between the first cover plate and the flange seat and between the second cover plate and the flange seat.

[0010] The above-mentioned hot-end EGR valve, a partition plate is arranged inside the cooling cavity, the partition plate divides the cooling cavity into an upper cavity and a lower cavity, the lower part of the first cover plate is provided with a water inlet connecting the water inlet pipe and the lower cavity, the upper part of the first cover plate is provided with a water outlet connecting the water outlet pipe and the upper cavity; the partition plate is arranged perpendicular to the first cover plate, one end of the partition plate is arranged in contact with the inner end surface of the first cover plate, and the other end of the partition plate is arranged at intervals with the second cover plate and forms a water outlet with the inner wall of the second cover plate; the upper cavity and the lower cavity are circulated through the water outlet, and form a circulation loop with the water inlet pipe and the water outlet pipe.

[0011] In the hot end EGR valve, the left and right ends of the lower cavity are respectively provided with a first flow port and a second flow port, and the left and right ends of the upper cavity are respectively provided with a third flow port and a fourth flow port.

[0012] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0013] The utility model provides a hot-end EGR valve, in which a cooling cavity is arranged on the airway and the peripheral side of a guide sleeve, which not only fully cools the high-temperature exhaust gas, but also cools the protection elements inside the valve body to avoid aging and damage due to high temperature, thereby extending the service life of the valve body. At the same time, the cooling cavity is completely arranged around the peripheral side of the airway, which can fully cool the high-temperature exhaust gas in the airway and improve the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the specific structure of the utility model;

[0015] Figure 2 It is an internal cross-sectional view of the utility model;

[0016] Figure 3 This is a first structural schematic diagram of the cooling cavity of the utility model;

[0017] Figure 4 This is a second structural schematic diagram of the cooling cavity of the present invention.

[0018] Wherein: 1. valve body, 2. first cover plate, 3. second cover plate, 4. water inlet pipe, 5. water outlet pipe, 6. air inlet, 7. air outlet, 8. bolts, 9. drive module, 10. valve stem, 11. guide sleeve, 12. sealing module, 13. sleeve, 14. sealing ring, 15. cooling cavity, 16. partition plate, 17. air duct, 18. flange seat, 19. first flow port, 20. second flow port, 21. third flow port, 22. fourth flow port. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] Hot end EGR valve, such as Figures 1 to 4 As shown, it includes a valve body 1, in which a valve stem 10, a guide sleeve 11, and a drive module 9 are installed. The drive module 9 is connected to the valve stem 10 and drives the valve stem 10 to move. The guide sleeve 11 is slidably assembled with the valve stem 10. An air inlet 6 and an air outlet 7 are respectively provided on the valve body 1. The air inlet 6 and the air outlet pipe 7 are connected through an air duct 17.

[0021] A sealing module 12 is installed between the top of the guide sleeve 11 and the valve stem 10. Figure 2 As shown, a sheath 13 is installed between the bottom end of the guide sleeve 11 and the valve stem 10 to ensure the sealing of the valve body.

[0022] A cooling cavity 15 is provided inside the valve body 1 and is located at the air passage 17 and the peripheral side of the guide sleeve 11 . The cooling cavity 15 is communicated with the water inlet pipe 4 and the water outlet pipe 5 respectively.

[0023] The cooling cavity 15 is formed by the annular cooling wall, the first cover plate 2 and the second cover plate 3 arranged on the periphery of the valve body. Figure 3 As shown, the two opposite ends of the cooling wall are open, and flange seats 18 are respectively provided at the open ends of the cooling wall. One flange seat 18 is connected to the first cover plate 2 through bolts 8, and the other flange seat 18 is connected to the second cover plate 3 through bolts 8.

[0024] Sealing rings 14 are respectively arranged between the first cover plate 2 and the flange seat 18 and between the second cover plate 3 and the flange seat 18 to ensure the sealing of the cooling cavity.

[0025] A partition plate 16 is arranged inside the cooling cavity 15, and the partition plate 16 divides the cooling cavity 15 into an upper cavity and a lower cavity. A water inlet connecting the water inlet pipe 4 and the lower cavity is arranged at the lower part of the first cover plate 2, and a water outlet connecting the water outlet pipe 5 and the upper cavity is arranged at the upper part of the first cover plate 2.

[0026] The partition plate 16 is arranged perpendicular to the first cover plate 2. Figure 2 As shown, one end of the partition plate 16 is fitted against the inner end surface of the first cover plate 2, and the other end of the partition plate 16 is spaced apart from the second cover plate 3 and forms a water outlet with the inner wall of the second cover plate 3, so that the upper cavity and the lower cavity flow through the water outlet and form a circulation loop with the water inlet pipe 4 and the water outlet pipe 5.

[0027] The left and right ends of the lower cavity are respectively provided with a first flow opening 19 and a second flow opening 20 , and the left and right ends of the upper cavity are respectively provided with a third flow opening 21 and a fourth flow opening 22 .

[0028] When performing the exhaust operation, water is first injected into the cooling cavity 15 through the water inlet pipe 4 to ensure the circulation of cooling water. When water is introduced, the water flows from the first flow port 19 and the second flow port 20 to the water outlet, and when the lower cavity is full of water, it flows to the upper cavity through the water outlet; when draining water, the water flows from the third flow port 21 and the fourth flow port 22 to the water outlet and is discharged through the water outlet pipe 5.

[0029] Then the driving module 9 drives the valve stem 10 to move upward to open the air port. At this time, the cooling cavity 15 will cool the high-temperature exhaust gas in the airway. At the same time, the upper part of the cooling cavity 15 will also cool the guide sleeve 11 to prevent the sheath 13 and the sealing module 12 at the end of the guide sleeve 11 from aging and damage due to high temperature.

[0030] At the same time, the cooling cavity 15 surrounds the circumference of the air duct 17. Since the water inlet direction and the gas outlet direction are arranged perpendicularly, the high-temperature exhaust gas inside the air duct 17 can be fully cooled by circulating water from the lower layer and out of the upper layer, while preventing the high-temperature exhaust gas from overflowing toward the guide sleeve, resulting in a better cooling effect.

[0031] The driving module 9 and the sealing module 12 described in the present invention both use conventional technologies to achieve functions such as driving and sealing, and their specific structures are not shown in the specification.

[0032] The utility model provides a hot-end EGR valve, in which a cooling cavity is arranged on the airway and the peripheral side of a guide sleeve, which not only fully cools the high-temperature exhaust gas, but also cools the protection elements inside the valve body to avoid aging and damage due to high temperature, thereby extending the service life of the valve body. At the same time, the cooling cavity is completely arranged around the peripheral side of the airway, which can fully cool the high-temperature exhaust gas in the airway and improve the cooling effect.

Claims

1. A hot-end EGR valve, comprising a valve body (1), wherein the valve body (1) is provided with an air inlet (6) and an air outlet (7), wherein the air inlet (6) and the air outlet (7) are connected via an air passage (17); a valve stem (10), a guide sleeve (11), and a drive module (9) are installed inside the valve body (1), wherein the drive module (9) is connected to the valve stem (10) and drives the valve stem (10) to move, and the guide sleeve (11) is slidably mounted on the valve stem (10); a sealing module (12) is installed between the top end of the guide sleeve (11) and the valve stem (10), and a protective sleeve (13) is installed between the bottom end of the guide sleeve (11) and the valve stem (10); the characteristics are: The valve body (1) is provided with a cooling cavity (15) located on the air passage (17) and the peripheral side of the guide sleeve (11), and the cooling cavity (15) is respectively connected to the water inlet pipe (4) and the water outlet pipe (5).

2. The hot end EGR valve according to claim 1, characterized in that: The cooling cavity (15) is formed by enclosing an annular cooling wall, a first cover plate (2), and a second cover plate (3) arranged on the periphery of the valve body. The two opposite ends of the cooling wall are open, and flange seats (18) are respectively arranged at the open ends of the cooling wall. One of the flange seats (18) is connected to the first cover plate (2) by bolts (8), and the other flange seat (18) is connected to the second cover plate (3) by bolts (8).

3. The hot end EGR valve according to claim 2, characterized in that: A sealing ring (14) is provided between the first cover plate (2) and the flange seat (18), and between the second cover plate (3) and the flange seat (18), respectively.

4. The hot end EGR valve according to claim 2, characterized in that: A partition plate (16) is provided inside the cooling cavity (15), and the partition plate (16) divides the cooling cavity (15) into an upper cavity and a lower cavity. A water inlet connecting the water inlet pipe (4) and the lower cavity is provided at the lower portion of the first cover plate (2), and a water outlet connecting the water outlet pipe (5) and the upper cavity is provided at the upper portion of the first cover plate (2). The partition plate (16) is arranged perpendicular to the first cover plate (2), one end of the partition plate (16) is arranged to fit the inner end surface of the first cover plate (2), and the other end of the partition plate (16) is arranged to be spaced from the second cover plate (3) and to form a water outlet with the inner wall of the second cover plate (3); the upper cavity and the lower cavity are circulated through the water outlet, and a circulation loop is formed with the water inlet pipe (4) and the water outlet pipe (5).

5. The hot end EGR valve according to claim 4, characterized in that: The left and right ends of the lower cavity are respectively provided with a first flow opening (19) and a second flow opening (20), and the left and right ends of the upper cavity are respectively provided with a third flow opening (21) and a fourth flow opening (22).

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