A hot end EGR valve with cooling structure

Abstract

The utility model discloses a hot end EGR valve with cooling structure, including valve seat, the left side of valve seat is connected with sensor shell, and the gear drive chamber is formed between sensor shell and valve seat, and the drive mechanism is set up in gear drive chamber, the lower valve body is connected with being worn to be equipped with the valve stem in the lower valve body, and the bottom of valve stem is connected with the valve piece, the guide bushing of setting in the lower part of valve stem is set up in the lower valve body, and the top of guide bushing and valve stem are installed with sealing ring subassembly, the upper portion of lower valve body is provided with the connecting flange, and the middle part of lower valve body is provided with the guide bushing seat, the lower part of lower valve body is provided with the gas passage, and the circumferential side of guide bushing seat and sealing ring subassembly is provided with the cooling water channel above the gas passage, the utility model not only has carried out the sufficient cooling to the guide portion and sealing element, has improved the cooling effect, has effectively blocked the high temperature exhaust gas to enter the valve seat simultaneously, has protected the component and spare part in the valve seat, avoided its due to high temperature influence aging breakage, prolonged the service life of EGR valve.

Description

Technical Field

[0001] This utility model relates to the field of EGR valve technology, and more specifically to a hot-end EGR valve with a cooling structure. Background Technology

[0002] The EGR valve (Exhaust Gas Recirculation valve) is a core component of the exhaust gas recirculation system of an automotive engine. Its full name is Exhaust Gas Recirculation. It is mainly used to control the amount of exhaust gas entering the intake manifold. By reintroducing some of the exhaust gas into the combustion chamber to participate in combustion, it aims to reduce combustion temperature and reduce nitrogen oxide (NOx) emissions.

[0003] In actual use, the high temperature and impurities in the exhaust gas can cause thermal deformation and failure of surrounding components, leading to valve jamming or leakage and ultimately product failure. Currently, there are technical solutions for adding cooling mechanisms to EGR valves, such as the "EGR Valve Seat with Integrated Cooling Water Jacket" disclosed in Chinese Patent CN201921014967X, which sets a "C"-shaped cooling water jacket inside the valve seat body. While this invention ensures cooling of the hot-end EGR valve and valve seat, it only cools the gas flow section and does not consider protecting other components inside the valve seat. This results in severe aging and damage to other components inside the valve body due to high temperatures. Furthermore, the C-shaped cooling water jacket cannot fully cool the gas flow section inside the valve seat, resulting in insufficient cooling effect.

[0004] Therefore, there is an urgent need for a hot-end EGR valve with a cooling structure. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a hot-end EGR valve with a cooling structure to solve the problems in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0007] A hot-end EGR valve with a cooling structure includes a valve seat, a sensor housing connected to the left side of the valve seat, forming a gear drive chamber between the sensor housing and the valve seat, and a drive mechanism disposed within the gear drive chamber; a lower valve body connected below the valve seat, a vertically arranged valve stem connected to the drive mechanism passing through the lower valve body, and a valve plate connected to the bottom end of the valve stem; a guide sleeve fitted inside the lower valve body and mounted between the top end of the guide sleeve and the valve stem, and a sealing ring assembly installed therebetween; a connecting flange for connecting to the valve seat is provided on the upper part of the lower valve body, and a vertically arranged guide sleeve seat is provided in the middle of the lower valve body; a gas passage is provided at the lower part of the lower valve body, and cooling water channels are provided above the gas passage and around the guide sleeve seat and the sealing ring assembly.

[0008] To further optimize the technical solution, the drive mechanism includes a drive motor, which is connected to a transmission gear, and the transmission gear is connected to a coaxially arranged cam; the cam is connected to a ball bearing disposed in the gear drive chamber, and the ball bearing is connected to the valve stem.

[0009] To further optimize the technical solution, a sealing element is installed between the lower part of the valve seat and the valve stem, and a pressure plate for fixing the sealing element is provided below the sealing element.

[0010] To further optimize the technical solution, the guide sleeve includes a guide portion fitted onto the middle of the valve stem and a protective sleeve disposed below the valve stem.

[0011] To further optimize the technical solution, the lower valve body is provided with an air inlet located at the lowest part of the gas channel, and the side of the lower valve body is provided with an air outlet communicating with the gas channel.

[0012] To further optimize the technical solution, a sealing part with valve plate cooperation and sealing is provided at the air inlet of the lower valve body.

[0013] To further optimize the technical solution, a connecting seat is provided on the lower valve body. The connecting seat is provided with an inlet that communicates with the cooling water inlet of the cooling water channel and an outlet that communicates with the cooling water outlet. A snap-fit ​​groove is provided on the outside of the lower valve body at the same level as the air inlet. A sealing gasket that is fitted between the lower valve body and the connecting seat is installed in the snap-fit ​​groove.

[0014] To further optimize the technical solution, the sealing gasket includes an annular sealing sheet and several snap fasteners disposed inside the annular sealing sheet.

[0015] To further optimize the technical solution, the top of the lower valve body is provided with a connecting flange for connecting with the valve seat, and the lower valve body is provided with an upper sealing groove and a lower sealing groove for water channels distributed around the circumference of the lower valve body below the connecting flange; an upper sealing ring is provided in the upper sealing groove for water channels, and a lower sealing ring is provided in the lower sealing groove for water channels; a cooling water inlet and a cooling water outlet for cooling water channels are provided between the upper sealing ring and the lower sealing ring.

[0016] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0017] This utility model provides a hot-end EGR valve with a cooling structure. The cooling water channel is set on the guide part of the guide sleeve and the periphery of the sealing ring assembly, and above the gas cavity. This not only fully cools the guide part and the sealing element, improving the cooling effect, but also effectively blocks high-temperature exhaust gas from entering the valve seat by setting the sealing ring assembly and sealing element, protecting the internal components of the valve seat and preventing them from aging and breaking due to high temperature, thus extending the service life of the EGR valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the lower valve body of this utility model; Figure 3 This is a schematic diagram of the structure of the EGR valve installed in the connecting seat in this utility model; Figure 4 This is a schematic diagram of the sealing gasket in this utility model.

[0019] The components are as follows: 1. Valve seat; 2. Lower valve body; 2a. Connecting flange; 2b. Guide sleeve; 2c. Cooling water channel; 2d. Cooling water inlet; 2e. Cooling water outlet; 2f. Gas channel; 2g. Air inlet; 2h. Air outlet; 2i. Sealing part; 2j. Upper sealing groove of water channel; 2k. Lower sealing groove of water channel; 21. Snap-on groove; 3. Sensor housing; 4. Transmission gear; 5. Ball bearing; 6. Valve stem; 7. Valve plate; 8. Guide sleeve; 8a. Guide part; 8b. Protective sleeve; 9. Sealing ring assembly; 10. Sealing element; 11. Pressure plate; 12. Upper sealing ring; 13. Lower sealing ring; 14. Sealing gasket; 14a. Sealing plate; 14b. Snap-on; 16. Connecting seat. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] A hot-end EGR valve with a cooling structure, combined with Figures 1 to 4 As shown, the valve includes a valve seat 1, a lower valve body 2, a snap-fit ​​groove 21, a sensor housing 3, a transmission gear 4, a ball bearing 5, a valve stem 6, a valve plate 7, a guide sleeve 8, a sealing ring assembly 9, a seal 10, a pressure plate 11, an upper sealing ring 12, a lower sealing ring 13, a sealing gasket 14, and a connecting seat 16. The lower valve body 2 includes a connecting flange 2a, a guide sleeve seat 2b, a cooling water channel 2c, a cooling water inlet 2d, a cooling water outlet 2e, a gas channel 2f, an air inlet 2g, an air outlet 2h, a sealing part 2i, an upper sealing groove 2j in the water channel, and a lower sealing groove 2k in the water channel; the guide sleeve 8 includes a guide part and a protective sleeve.

[0022] The left side of the valve seat 1 is connected to the sensor housing 3. The sensor housing 3 and the valve seat 1 are connected and fastened by a clamp. A sealing ring is provided at the contact position between the sensor housing 3 and the valve seat 1 to prevent the failure of internal components due to external environmental influences.

[0023] A lower valve body 2 is connected below the valve seat 1. The valve seat 1 and the lower valve body 2 are riveted together. A valve stem 6, which is connected to the drive mechanism and is vertically arranged, is inserted inside the lower valve body 2. A valve plate 7 is connected to the bottom end of the valve stem 6.

[0024] A gear drive chamber is formed between the sensor housing and the valve seat 1, and a drive mechanism is installed inside the gear drive chamber. The drive mechanism includes a drive motor, which is connected to a transmission gear 4. The transmission gear 4 is connected to a coaxially mounted cam. The cam is connected to a ball bearing 5 located in the gear drive chamber, and the ball bearing is connected to the valve stem 6. Power is transmitted through the cam to the ball bearing 5 located inside the gear chamber, and the cam drives the rotational motion of the transmission gear 4 to drive the valve stem 6 to perform reciprocating linear motion.

[0025] A guide sleeve 8 is provided inside the lower valve body 2, which is fitted onto the lower part of the valve stem 6. The guide sleeve 8 includes a guide portion 8a fitted onto the middle part of the valve stem 6 and a protective sleeve 8b located below the valve stem 6. The protective sleeve 8b extends all the way to near the valve plate 7, which can effectively prevent the impact of high-temperature exhaust on the valve stem 6, and prevent carbon deposits and foreign matter from forming on the surface of the valve stem 6 and entering the guide portion 8a of the guide sleeve 8, thereby preventing the valve stem 6 from getting stuck.

[0026] A sealing ring assembly 9 is installed between the top of the guide sleeve 8 and the valve stem 6, which can effectively prevent the high-temperature exhaust gas at the bottom of the valve body from entering the upper part of the lower valve body 2 through the guide sleeve 8.

[0027] The lower valve body 2 has a connecting flange 2a at its upper part for connection with the valve seat 1, and a vertically arranged guide sleeve 2b in the middle part of the lower valve body 2, which matches the guide sleeve. A gas passage 2f is provided at the lower part of the lower valve body 2, and a cooling water channel 2c is provided above the gas passage 2f, around the guide sleeve 2b, and around the sealing ring assembly 9. The cooling water channel 2c cools the guide portion 8a of the guide sleeve 8 and the periphery of the sealing ring assembly 9, and then the cooling water is introduced into the connecting seat 16 from the cooling outlet 2e of the lower valve body 2 to form a cooling cycle; this effectively prevents high-temperature gas from rising and prevents the upper components from aging and failing.

[0028] A seal 10 is installed between the lower part of the valve seat 1 and the valve stem 6, and a pressure plate 11 is provided below the seal 10 to fix the seal 10. The seal 10 can prevent substances from the external environment from entering the gear chamber through the position between the lower part of the valve seat 1 and the valve stem 6, which would cause the components inside the gear chamber to fail. The lower valve body 2 is provided with an air inlet 2g located at the lowest part of the gas channel 2f, and an air outlet 2h communicating with the gas channel 2f is provided on the side of the lower valve body 2. A sealing part 2i is provided at the air inlet 2g of the lower valve body 2, which is fitted and sealed with a valve plate. The gas flow rate in the gas channel 2f of the lower valve body 2 is regulated by the contact and disengagement of the valve plate and the sealing part 2i.

[0029] Below the connecting flange 2a, there are upper sealing grooves 2j and lower sealing grooves 2k distributed around the circumference of the lower valve body 2. An upper sealing ring 12 is installed in the upper sealing groove 2j and a lower sealing ring 13 is installed in the lower sealing groove 2k, forming an independent cavity that separates the cooling water channel 2c from the gas.

[0030] A cooling water inlet 2d and a cooling water outlet 2e are provided between the upper sealing ring 12 and the lower sealing ring 13.

[0031] The lower valve body 2 is provided with a connecting seat 16. The connecting seat 16 is provided with an inlet and an outlet. The cooling water inlet 2d of the cooling water channel 2c is connected to the inlet, and the cooling water outlet 2e is connected to the outlet of the connecting seat 16.

[0032] A snap-fit ​​groove 21 is provided on the outside of the lower valve body 2 at the same level as the air inlet 2g. A sealing gasket 14, which is fitted between the lower valve body 2 and the connecting seat 16, is installed in the snap-fit ​​groove 21. The sealing gasket 14 is a corrugated sealing gasket 14, which includes an annular sealing sheet 14a and several snaps 14b disposed on the inner side of the annulus. When the sealing gasket 14 is installed on the lower valve body 2, the snaps 14b distributed around the circumference will naturally fall into the snap-fit ​​groove 21 provided on the lower valve body 2, preventing the sealing gasket 14 from falling off during assembly and causing misalignment and assembly failure. The sealing gasket 14 can prevent gas from flowing into the air outlet 2h through the mating gap between the lower valve body 2 and the connecting seat 16, and prevent excessive gas leakage that could cause abnormal engine operation when the valve is closed.

[0033] This invention places the cooling water channel 2c on the guide part of the guide sleeve and around the sealing ring assembly 9, above the gas cavity. This not only fully cools the guide part and the sealing element, improving the cooling effect, but also effectively blocks high-temperature exhaust gas from entering the valve seat 1, protecting the internal components of the valve seat 1 and preventing them from aging and breaking due to high temperature, thus extending the service life of the EGR valve.

Claims

1. A hot-end EGR valve with a cooling structure, characterized in that: The device includes a valve seat (1), a sensor housing (3) connected to the left side of the valve seat (1), a gear drive chamber formed between the sensor housing (3) and the valve seat (1), and a drive mechanism installed in the gear drive chamber; a lower valve body (2) is connected below the valve seat (1), a valve stem (6) connected to the drive mechanism and vertically arranged is installed inside the lower valve body (2), and a valve plate (7) is connected to the bottom end of the valve stem (6); a guide sleeve (8) is provided inside the lower valve body (2) and fitted in the lower part of the valve stem (6), and a sealing ring assembly (9) is installed between the top end of the guide sleeve (8) and the valve stem (6); a connecting flange (2a) for connecting with the valve seat (1) is provided on the upper part of the lower valve body (2), and a vertically arranged guide sleeve seat (2b) is provided in the middle of the lower valve body (2); a gas passage (2f) is provided at the lower part of the lower valve body (2), and a cooling water channel (2c) is provided above the gas passage (2f), around the guide sleeve seat (2b) and the sealing ring assembly (9).

2. The hot-end EGR valve with cooling structure according to claim 1, characterized in that: The drive mechanism includes a drive motor, which is connected to a transmission gear (4), and the transmission gear is connected to a cam that is coaxially arranged; the cam is connected to a ball bearing arranged in the gear drive chamber, and the ball bearing is connected to the valve stem (6).

3. The hot-end EGR valve with cooling structure according to claim 1, characterized in that: A sealing element (10) is installed between the lower part of the valve seat (1) and the valve stem (6), and a pressure plate (11) for fixing the sealing element (10) is provided below the sealing element (10).

4. The hot-end EGR valve with cooling structure according to claim 1, characterized in that: The guide sleeve (8) includes a guide portion fitted in the middle of the valve stem and a protective sleeve provided below the valve stem.

5. The hot-end EGR valve with cooling structure according to claim 1, characterized in that: The lower valve body (2) is provided with an air inlet (2g) located at the bottom of the gas channel (2f), and an air outlet (2h) connected to the gas channel (2f) is provided on the side of the lower valve body.

6. The hot-end EGR valve with cooling structure according to claim 5, characterized in that: The lower valve body (2) is provided with a sealing part (2i) at the air inlet (2g) where a valve plate (7) is used to seal.

7. The hot-end EGR valve with cooling structure according to claim 5, characterized in that: The lower valve body is provided with a connecting seat (16), and the connecting seat (16) is provided with an inlet that communicates with the cooling water inlet (2d) of the cooling water channel (2c) and an outlet that communicates with the cooling water outlet (2e); the lower valve body (2) is provided with a snap-fit ​​groove (21) at the same level as the air inlet (2g) on ​​the outside of the lower valve body (2), and a sealing gasket (14) is installed in the snap-fit ​​groove between the lower valve body (2) and the connecting seat (16).

8. The hot-end EGR valve with cooling structure according to claim 7, characterized in that: The sealing gasket (14) includes an annular sealing sheet (14a) and a plurality of snap fasteners (14b) disposed inside the annular sealing sheet (14a).

9. The hot-end EGR valve with cooling structure according to claim 1, characterized in that: The lower valve body (2) is provided with a connecting flange (2a) for connecting to the valve seat (1) at the top. The lower flange (2a) is provided with an upper sealing groove (2j) and a lower sealing groove (2k) of the water channel distributed around the circumference of the lower valve body (2). An upper sealing ring (12) is provided in the upper sealing groove (2j) and a lower sealing ring (13) is provided in the lower sealing groove (2k). A cooling water inlet (2d) and a cooling water outlet (2e) of a cooling water channel (2c) are provided between the upper sealing ring (12) and the lower sealing ring (13).

Images