A valve for waste gas recirculation based on a desulfurization tower

Abstract

This invention discloses a valve for waste gas recirculation based on a desulfurization tower, specifically relating to the field of valves. The valve includes a valve body with an inlet and an outlet horizontally arranged, one above the other. A valve sleeve is installed between the inlet and outlet, with the axis of the valve sleeve perpendicular to the axes of the inlet and outlet. A valve core is housed inside the valve sleeve, and an elastic component for resetting the valve core upwards is installed at its bottom. An external air port communicating with the inlet is formed on the side wall of the valve sleeve. This invention achieves gas flow control by using an internal air port and a groove, and by moving the valve core to connect the internal and external air ports or the groove and the external air port. By having the waste gas contact the inner wall of the groove when the valve is closed, the problem of impurity adhesion and corrosion caused by continuous contact between the waste gas and the sealing surface can be avoided, and the problem of impurities being carried from the valve core sealing surface to the valve sleeve sealing surface can also be avoided, ensuring valve sealing performance.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically, to a valve for waste gas recirculation based on a desulfurization tower. Background Technology

[0002] Marine diesel engines generate high-temperature exhaust gases containing sulfur oxides and nitrogen oxides. On one hand, the exhaust gases are fed into a desulfurization tower, where wet scrubbing removes sulfides and particulate matter. On the other hand, an exhaust gas recirculation system is installed to control the return of some diesel engine exhaust gases, introducing a suitable amount of exhaust gas into the intake side of the diesel engine to reduce combustion temperature and suppress the formation of nitrogen oxides.

[0003] The exhaust gas recirculation valve (EGR valve) is installed between the intake manifold and the exhaust manifold. It can automatically close, open, and adjust the opening degree according to different operating conditions of marine diesel engines, such as idling, cold start, acceleration, cruising, and full load, to suppress the generation of nitrogen oxides and ensure engine power output and operational stability.

[0004] Existing exhaust gas recirculation valves open and close by moving the valve stem. The exhaust gas treated by the desulfurization tower has a complex composition, containing not only incompletely removed sulfur oxides and dust particles, but also impurities such as moisture and acidic substances. When the valve is open, these large-volume impurities will be in contact with the sealing surfaces of the valve body and valve stem for a long time, causing corrosion. After long-term operation, this will lead to problems with poor sealing. Summary of the Invention

[0005] The present invention provides a valve for waste gas recirculation based on a desulfurization tower. The problem to be solved is that when existing valves are opened, a large flow of impurities will come into contact with the sealing surfaces of the valve body and valve stem for a long time, causing erosion. After long-term operation, this will cause the valve to become unsealed.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a valve for waste gas recirculation based on a desulfurization tower, comprising a valve body having an inlet and an outlet horizontally arranged, one above the other, and a valve sleeve installed between the inlet and the outlet, the axis of the valve sleeve being perpendicular to the axes of the inlet and the outlet; a valve core being disposed inside the valve sleeve, and an elastic component for resetting the valve core upwards being installed at the bottom of the valve core; an outer air port communicating with the inlet is formed on the side wall of the valve sleeve, and an inner air port communicating with the outlet is formed on the side wall of the valve core; when the outer air port and the inner air port are connected in a one-to-one correspondence, the inlet and outlet are connected from the positions of the outer air port and the inner air port; a groove equal in number to the inner air port is formed on the side wall of the valve core, and when the groove is connected with the outer air port, the inlet and outlet are disconnected.

[0007] Preferably, the valve for exhaust gas recirculation also includes a power assembly, which includes a motor mounted on the valve body, a cam mounted on the output end of the motor, a valve stem slidably inserted into the valve body, the bottom end of the valve stem being fixedly connected to the valve core, and the outer surface of the cam having a base circle surface and a convex circle surface, which are used to contact the upper end of the valve stem.

[0008] Preferably, an adjusting rod corresponding to an internal air port is slidably installed inside the valve core along the radial direction. The adjusting rod is used to block or open the internal air port. An elastic component two is installed on the adjusting rod. The two ends of the elastic component two are connected to the adjusting rod and the valve core. The elastic component two is used to reset the adjusting rod towards the internal air port.

[0009] Preferably, the exhaust gas recirculation valve further includes a drive assembly, which includes a turntable disposed inside the valve core. The turntable has drive grooves that correspond one-to-one with the adjusting rods. One end of the drive groove is located on the side near the center of the turntable, and the other end of the drive groove is located on the side away from the center of the turntable. A pin is installed at the bottom of the adjusting rod, and the pin slides inside the drive groove.

[0010] Preferably, the drive assembly further includes a rod rotatably connected inside the valve stem, the lower end of the rod being fixedly connected to the turntable, a driven column being fixedly installed at the upper edge of the rod, and a drive column being fixedly installed at the front edge of the cam. The drive column is used to push the driven column to rotate the rod.

[0011] Preferably, a guide block is provided on the outer surface of the valve stem, and a guide groove is provided on the inner wall of the valve body, in which the guide block slides.

[0012] Preferably, a limiting block is fixedly installed on the inner wall of the valve sleeve above the valve core, and when the upper surface of the valve core contacts the bottom surface of the limiting block, the external air port and the groove are connected.

[0013] The technical effects and advantages of this invention are as follows: By setting an inner air port and a groove, and utilizing a movable valve core to connect the inner air port and the outer air port, or to connect the groove and the outer air port, the invention achieves the flow and disconnection of gas. By having the exhaust gas contact the inner wall of the groove when the valve is closed, the problem of impurity adhesion and corrosion caused by continuous contact between the exhaust gas and the sealing surface can be avoided. Furthermore, the problem of impurities being carried from the valve core sealing surface to the valve sleeve sealing surface can be prevented, thus ensuring the valve's sealing performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a partial structural cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the structure of the valve sleeve and valve core of the present invention; Figure 5 For the present invention Figure 4 A sectional view of the structure; Figure 6 This is a schematic diagram of the power component of the present invention; Figure 7 This is a schematic diagram of the structure of the driving component of the present invention.

[0015] The attached figures are labeled as follows: 1. Valve body; 11. Air inlet; 12. Air outlet; 2. Valve sleeve; 21. External air port; 22. Side air port; 23. Limiting block; 3. Valve core; 31. Internal air port; 32. Groove; 4. Elastic component one; 5. Power assembly; 51. Motor; 52. Cam; 521. Base circle surface; 522. Convex circle surface; 53. Valve stem; 6. Adjusting rod; 61. Elastic component two; 7. Drive assembly; 71. Turntable; 711. Drive groove; 72. Pin; 73. Insert rod; 731. Driven column; 74. Drive column. Detailed Implementation

[0016] 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.

[0017] Refer to the instruction manual appendix Figures 1-6 A valve for waste gas recirculation based on a desulfurization tower includes a valve body 1. The valve body 1 has an inlet 11 and an outlet 12 arranged horizontally, one above the other. A valve sleeve 2 is installed between the inlet 11 and the outlet 12. The axis of the valve sleeve 2 is perpendicular to the axis of the inlet 11 and the outlet 12. A valve core 3 is provided inside the valve sleeve 2. An elastic component 4 for resetting the valve core 3 upward is installed at the bottom of the valve core 3.

[0018] It should be noted that, as Figure 3 As shown, the air inlet 11 and the air outlet 12 are arranged vertically and horizontally, facing the two sides of the valve body 1 respectively. The valve body 1 has a split structure, that is, it is divided into upper and lower parts. The valve sleeve 2 is installed inside the valve body 1, with the upper and lower ends pressing on the upper and lower parts of the valve body 1 respectively to realize the installation and fixation of the valve sleeve 2. The valve sleeve 2 has a side air port 22 on the side facing the air outlet 12, which is used to pass gas.

[0019] In this embodiment, the side wall of the valve sleeve 2 is provided with an outer air port 21 that communicates with the air inlet 11, and the side wall of the valve core 3 is provided with an inner air port 31 that communicates with the air outlet 12. When the outer air port 21 and the inner air port 31 are connected in a one-to-one correspondence, the air inlet 11 and the air outlet 12 are connected from the positions of the outer air port 21 and the inner air port 31. The side wall of the valve core 3 is provided with a groove 32 that is equal in number to the inner air port 31. When the groove 32 is connected with the outer air port 21, the air inlet 11 and the air outlet 12 are disconnected.

[0020] It should be noted that the exhaust gas recirculation valve also includes a power component 5, which drives the valve core 3 to move up and down. When the valve core 3 is at its highest position, the groove 32 is aligned and connected with the external air port 21. The groove 32 is a blind hole, at which point the external air port 21 is blocked, and the inlet 11 and outlet 12 are cut off. When the valve core 3 is at its lowest position, the external air port 21 and the internal air port 31 are aligned and connected. At this point, the inlet 11 and outlet 12 are connected at the positions of the external air port 21 and the internal air port 31. The exhaust gas, after being washed and purified by the desulfurization tower, enters from the inlet 11 and is discharged into the diesel engine from the outlet 12 through the external air port 21 and the internal air port 31. The elastic component 4 is a compression spring used to reset the valve core 3 to its highest point.

[0021] In the above embodiments, such as Figure 7 As shown, the power assembly 5 includes a motor 51 mounted on the valve body 1. A cam 52 is mounted on the output end of the motor 51. A valve stem 53 is slidably inserted into the valve body 1. The bottom end of the valve stem 53 is fixedly connected to the valve core 3. The outer surface of the cam 52 has a base circle surface 521 and a convex circle surface 522. The base circle surface 521 and the convex circle surface 522 are used to contact the upper end of the valve stem 53.

[0022] It should be noted that the motor 51 drives the cam 52 to rotate. When the base circular surface 521 contacts the upper end of the valve stem 53, the valve core 3 is located at the highest point. When it rotates to the point where the convex circular surface 522 contacts the upper end of the valve stem 53, the convex circular surface 522 will press down on the valve stem 53, thereby driving the valve core 3 to move downward.

[0023] Furthermore, a guide block is provided on the outer surface of the valve stem 53, and a guide groove is provided on the inner wall of the valve body 1, in which the guide block slides.

[0024] It should be noted that the guide block and guide groove are designed to allow the valve stem 53 to move axially but not rotate.

[0025] In this embodiment, the implementation method is as follows: In the initial state, the valve core 3 is located at its highest point, the base circular surface 521 is in contact with the upper end of the valve stem 53, the groove 32 is aligned and connected with the external air port 21, the external air port 21 is blocked, the air inlet 11 and the air outlet 12 are cut off, the exhaust gas cannot pass through, and the valve is in the closed state. When it is necessary to allow the exhaust gas to pass through and open the valve, the motor 51 drives the cam 52 to rotate, rotating it to the position where the convex circular surface 522 contacts the upper end of the valve stem 53. During this process, the cam 52 presses down on the valve core 3, causing the valve core 3 to move from the highest point to the lowest point. At the lowest point, the external air port 21 and the internal air port 31 are connected, and the air inlet 11 and the air outlet 12 are connected at the positions of the external air port 21 and the internal air port 31. The exhaust gas is discharged from the air inlet 11 through the external air port 21 and the internal air port 31 and then into the diesel engine through the air outlet 12.

[0026] In the above technical solution, by setting an inner air port 31 and a groove 32, the gas flow is switched on and off by using a movable valve core 3 to connect the inner air port 31 and the outer air port 21 or to connect the groove 32 and the outer air port 21. The sealing surfaces of the valve sleeve 2 and the valve core 3 for the gas are the inner side wall of the valve sleeve 2 and the outer side wall of the valve core 3, respectively. When the groove 32 and the outer air port 21 are connected, the gas passes through the outer air port 21 and the inner air port 31, and the waste gas will not come into contact with the sealing surface. Therefore, impurities in the waste gas will not come into contact with the sealing surface. When the groove 32 and the outer air port 21 are connected, since the groove 32 is a blind hole, the waste gas only comes into contact with the inner wall of the groove 32 and will not come into contact with the sealing surface. When the valve is open, only the waste gas in the internal cavity of the groove 32 comes into contact with the sealing surface, and the amount of waste gas is extremely small and can be ignored. Therefore, by having the exhaust gas contact the inner wall of the groove 32 when the valve is closed, the problem of impurity adhesion and corrosion caused by the continuous contact between the exhaust gas and the sealing surface can be avoided, and the problem of impurities being carried by the sealing surface of the valve core 3 to the sealing surface of the valve sleeve 2 can be avoided, thus ensuring the valve's sealing performance.

[0027] With the above technical solution, the structure of the existing valve body 1 does not need to be changed, and there is no need to re-mold the valve body 1, thus saving production costs.

[0028] The valve opening varies under different operating conditions of marine diesel engines, such as idling, cold start, acceleration, cruising, and full load. Therefore, the following technical solutions are proposed.

[0029] Specifically, refer to the instruction manual appendix. Figures 1-7 Inside the valve core 3, an adjusting rod 6 corresponding to the inner air port 31 is slidably mounted radially. The adjusting rod 6 is used to block or open the inner air port 31. An elastic component 61 is mounted on the adjusting rod 6. The two ends of the elastic component 61 are connected to the adjusting rod 6 and the valve core 3. The elastic component 61 is used to reset the adjusting rod 6 towards the inner air port 31. The elastic component 61 is a tension spring.

[0030] Furthermore, the exhaust gas recirculation valve also includes a drive assembly 7, which includes a turntable 71 disposed inside the valve core 3. The turntable 71 has drive grooves 711 that correspond one-to-one with the adjusting rod 6. One end of the drive groove 711 is located on the side near the middle of the turntable 71, and the other end of the drive groove 711 is located on the side away from the middle of the turntable 71. A pin 72 is installed at the bottom of the adjusting rod 6, and the pin 72 slides inside the drive groove 711.

[0031] Furthermore, the drive assembly 7 also includes a rod 73 rotatably connected inside the valve stem 53. The lower end of the rod 73 is fixedly connected to the turntable 71. A driven post 731 is fixedly installed at the upper edge of the rod 73. A drive post 74 is fixedly installed at the front edge of the cam 52. The drive post 74 is used to push the driven post 731 to rotate the rod 73.

[0032] It should be noted that when the cam 52 rotates, it drives the drive column 74 to rotate. The drive column 74, in turn, pushes the driven column 731 to rotate the insert rod 73. The insert rod 73 then drives the turntable 71 to rotate. The turntable 71, guided by the drive groove 711, pushes the pin 72 from the outer end to the inner end of the drive groove 711. This allows the inner air port 31 to be opened via the adjusting rod 6. The opening distance can be controlled to adjust the degree of opening. When the cam 52 rotates in the opposite direction, the adjusting rod 6 is pulled back to its original position by the tension of the elastic component 61, thereby closing the inner air port 31. Alternatively, a torsion spring can be installed between the insert rod 73 and the valve stem 53 to increase the reset force of the insert rod 73.

[0033] Working principle: When the valve is closed, the base circular surface 521 contacts the upper end of the valve stem 53, the valve core 3 is at its highest point, the groove 32 is connected to the external air port 21, the valve is closed, and the pin 72 is located at the outer end of the drive groove 711. When the valve is to be opened, the motor 51 drives the cam 52 to rotate, the convex circular surface 522 presses down on the valve stem 53, the valve stem 53 and the insert rod 73 move downward together, the valve stem 53 drives the valve core 3 to move downward, so that the inner air port 31 and the outer air port 21 are connected, the valve is opened, the motor 51 continues to drive the cam 52 to rotate, the cam 52 drives the drive column 74 to push the driven column 731 to make the insert rod 73 rotate, the insert rod 73 drives the turntable 71 to rotate, and pushes the pin 72 from the outer end of the drive groove 711 to the inner end of the drive groove 711 through the drive groove 711, so that the inner air port 31 can be opened by adjusting the rod 6, and the opening degree can be controlled by controlling the opening distance. When the valve needs to be closed, the motor 51 drives the valve stem 53 to reverse, and the drive column 74 gradually disengages from the driven column 731. During this process, through the action of the torsion spring between the insert rod 73 and the valve stem 53, and through the pulling force of the elastic component 61, the turntable 71 can be rotated back to its original position, and the adjusting rod 6 can be moved back to its original position to close the inner air port 31. The cam 52 continues to rotate until the base circle surface 521 contacts the upper end of the valve stem 53. During this process, under the action of the elastic component 4, the valve core 3 returns to its original position, the groove 32 connects with the outer air port 21, and the valve is closed.

[0034] It should be added that, in cases such as Figure 5 In the state shown, the adjusting rod 6 enters the inner air port 31, which can be completely blocked. At this time, the adjusting rod 6 can move the maximum distance away from the middle of the valve core 3. The surface of the adjusting rod 6 at the end away from the middle of the valve core 3 has not yet moved to the position of the outer wall of the valve core 3. Therefore, even if corrosive impurities adhere to the surface of the adjusting rod 6, they cannot contact the outer wall of the valve core 3 and the inner wall of the valve sleeve 2, that is, they cannot contact the sealing surface, thus avoiding the problem of impurities being carried to the sealing surface.

[0035] Refer to the instruction manual appendix Figure 4 A limiting block 23 is fixedly installed on the inner wall of the valve sleeve 2 and above the valve core 3. When the upper surface of the valve core 3 contacts the bottom surface of the limiting block 23, the external air port 21 and the groove 32 are connected.

[0036] It should be noted that the limit block 23 is used to determine the highest point of the elastic component 4 resetting the valve core 3, that is, the position where the upper end of the valve core 3 contacts the lower surface of the limit block 23 is the highest point of the valve core 3.

[0037] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. A valve for waste gas recirculation based on a desulfurization tower, characterized in that: Includes a valve body (1), the valve body (1) having an air inlet (11) and an air outlet (12) arranged horizontally with one on top of the other, a valve sleeve (2) installed between the air inlet (11) and the air outlet (12), the axis of the valve sleeve (2) being perpendicular to the axis of the air inlet (11) and the air outlet (12), a valve core (3) being provided inside the valve sleeve (2), and an elastic component (4) for resetting the valve core (3) upward is installed at the bottom of the valve core (3); The valve sleeve (2) has an outer air port (21) connected to the air inlet (11) on its side wall, and the valve core (3) has an inner air port (31) connected to the air outlet (12) on its side wall. When the outer air port (21) and the inner air port (31) are connected one-to-one, the air inlet (11) and the air outlet (12) are connected from the positions of the outer air port (21) and the inner air port (31). The valve core (3) has a groove (32) on its side wall, which is equal in number to the inner air port (31). When the groove (32) is connected to the outer air port (21), the air inlet (11) and the air outlet (12) are disconnected.

2. The valve for waste gas recirculation based on a desulfurization tower according to claim 1, characterized in that: The exhaust gas recirculation valve also includes a power assembly (5), which includes a motor (51) mounted on the valve body (1). A cam (52) is mounted on the output end of the motor (51). A valve stem (53) is slidably inserted into the valve body (1). The bottom end of the valve stem (53) is fixedly connected to the valve core (3). The outer surface of the cam (52) has a base circle surface (521) and a convex circle surface (522). The base circle surface (521) and the convex circle surface (522) are used to contact the upper end of the valve stem (53).

3. A valve for waste gas recirculation based on a desulfurization tower according to claim 2, characterized in that: Inside the valve core (3), an adjusting rod (6) corresponding to the inner air port (31) is slidably installed in the radial direction. The adjusting rod (6) is used to block or open the inner air port (31). An elastic component (61) is installed on the adjusting rod (6). The two ends of the elastic component (61) are connected to the adjusting rod (6) and the valve core (3). The elastic component (61) is used to reset the adjusting rod (6) towards the inner air port (31).

4. A valve for waste gas recirculation based on a desulfurization tower according to claim 3, characterized in that: The exhaust gas recirculation valve also includes a drive assembly (7), which includes a turntable (71) disposed inside the valve core (3). The turntable (71) has drive grooves (711) that correspond one-to-one with the adjusting rod (6). One end of the drive groove (711) is located on the side near the middle of the turntable (71), and the other end of the drive groove (711) is located on the side away from the middle of the turntable (71). A pin (72) is installed at the bottom of the adjusting rod (6), and the pin (72) slides inside the drive groove (711).

5. A valve for waste gas recirculation based on a desulfurization tower according to claim 4, characterized in that: The drive assembly (7) further includes a plug rod (73) rotatably connected inside the valve stem (53). The lower end of the plug rod (73) is fixedly connected to the turntable (71). A driven column (731) is fixedly installed at the upper edge of the plug rod (73). A drive column (74) is fixedly installed at the front edge of the cam (52). The drive column (74) is used to push the driven column (731) to rotate the plug rod (73).

6. A valve for waste gas recirculation based on a desulfurization tower according to claim 2, characterized in that: The outer surface of the valve stem (53) is provided with a guide block, and the inner wall of the valve body (1) is provided with a guide groove, in which the guide block slides.

7. A valve for waste gas recirculation based on a desulfurization tower according to claim 1, characterized in that: A limiting block (23) is fixedly installed on the inner wall of the valve sleeve (2) and above the valve core (3). When the upper surface of the valve core (3) contacts the bottom surface of the limiting block (23), the external air port (21) and the groove (32) are connected.

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