A valve for exhaust gas recirculation of marine diesel engines based on a desulfurization tower

Abstract

The present invention relates to the technical field of exhaust gas recirculation valves, and discloses a valve for exhaust gas recirculation of marine diesel engines based on a desulfurization tower, comprising a valve body, a valve sealing mechanism and a limit shielding mechanism, wherein the valve sealing mechanism is arranged at the upper right side of an intake pipe, the valve sealing mechanism comprises a sealing frame and a moving rod, the moving rod is connected through and through the upper right side of the intake pipe, the sealing frame is fixedly arranged at the inner side end of the moving rod, the limit shielding mechanism is arranged above the exhaust pipe, and the limit shielding mechanism comprises a limit plate 1, a filter plate is fixedly arranged at the bottom left end of the limit plate 1, and the right end of the limit plate 1 is connected through and through the limit sealing plate. The present invention is suitable for being installed on the exhaust gas recirculation valve of a marine diesel engine of a desulfurization tower, and is convenient for automatically controlling the inward and outward movement adjustment of the moving rod so that the sealing frame seals and shields the inside of the exhaust pipe, and automatically controlling the lifting and lowering adjustment of the limit plate 1, so that the filter plate is inserted into the sealing frame to filter and purify the exhaust gas.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust gas recirculation valves, and in particular to a valve for exhaust gas recirculation of a marine diesel engine based on a desulfurization tower. Background Art

[0002] In the exhaust gas recirculation system of marine diesel engines in the desulfurization tower, the valve used is usually an EGR valve, that is, an exhaust gas recirculation valve. The EGR valve is a mechatronic product used to control the amount of exhaust gas recirculation fed back to the intake system;

[0003] The main function of the EGR valve is to guide the exhaust gas discharged from the engine combustion to the intake manifold to participate in the combustion, so as to reduce the temperature of the combustion chamber, improve the working efficiency of the engine, improve the combustion environment, and reduce the burden on the engine, effectively reduce the emission of NOx compounds and knock, and extend the service life of various components;

[0004] In the exhaust gas recirculation system of a marine diesel engine in a desulfurization tower, the working mode of the EGR valve is similar to that of a general diesel engine. When the engine is running under load, the EGR valve opens, allowing a small amount of exhaust gas to enter the intake manifold and enter the combustion chamber together with the combustible mixture. When idling, the EGR valve is closed, and almost no exhaust gas is recirculated to the engine.

[0005] The existing exhaust gas recirculation valve is not convenient to quickly connect and install to the marine diesel engine of the desulfurization tower, and the exhaust gas cannot be filtered and purified during the opening and closing operation inside the valve. The sealing and shielding operation inside the valve is inconvenient, and the automation performance is low. Therefore, it is necessary to design a corresponding technical solution to solve this problem. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a valve for exhaust gas recirculation of a marine diesel engine based on a desulfurization tower, which solves the technical problems that the existing exhaust gas recirculation valve is inconvenient to quickly connect and install to the marine diesel engine of the desulfurization tower, and the exhaust gas cannot be filtered and purified during the opening and closing operation inside the valve, the internal sealing of the valve is inconvenient to operate, and the automation performance is low.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: A valve for exhaust gas recirculation of marine diesel engines based on a desulfurization tower, comprising a valve body, a valve sealing mechanism and a limit shielding mechanism, wherein the valve body is composed of an intake pipe and an exhaust pipe and is in a right-angle structure, the inner wall specification of the intake pipe is larger than the inner wall specification of the exhaust pipe, and the outer ends of the intake pipe and the exhaust pipe are both welded with mounting plates;

[0010] The valve sealing mechanism is arranged on the upper right side of the air intake pipe, and the valve sealing mechanism comprises a sealing frame and a moving rod, the moving rod penetrates and is connected to the upper right side of the air intake pipe, the sealing frame is fixedly arranged on the inner side end of the moving rod, a storage groove is provided inside the sealing frame, and ventilation grooves are provided on both sides of the sealing frame;

[0011] The limiting shielding mechanism is arranged above the exhaust pipe, a slide groove is provided above the exhaust pipe, a mounting groove is provided above the slide groove, the limiting shielding mechanism includes a limiting plate, a filter plate is fixedly provided at the left end of the bottom of the limiting plate, filter holes are distributed inside the filter plate, and the right end of the limiting plate passes through a sliding connection with a limiting sealing plate.

[0012] Preferably, a limiting cylinder is fixedly provided on the upper right side of the air intake pipe, the movable rod is connected to the interior of the limiting cylinder, a support plate 1 is fixedly provided on the upper outer end of the movable rod, and spring rods are fixedly distributed on the inner wall of the support plate 1 and the outer wall of the air intake pipe; the limiting cylinder is provided to limit the inward and outward movement adjustment of the movable rod, the support plate 1 is used to support a double set of spring rods, and the spring rods are used to stably support the movable rod and buffer and reduce shock.

[0013] Preferably, a bracket 1 is welded to the outer end of the movable rod, a bracket 2 is fixedly provided at the lower right side of the intake pipe, and an adjustment plate is movably connected between the bracket 1 and the bracket 2 via a rotating shaft; the bracket 1 and the bracket 2 are arranged to movably support the adjustment plate to avoid jamming and blockage.

[0014] Preferably, a transverse plate is provided below the bracket two, and a pushing mechanism is provided between the upper outer end of the transverse plate and the outer side wall of the adjusting plate, the pushing mechanism comprises an electric push rod device one, a push rod one, a bracket three, a bracket four and a support plate four, the support plate four is welded to the upper outer end of the transverse plate, the bracket four is welded to the upper part of the support plate four, the outer end of the electric push rod device one is welded with a support plate three, the support plate three is rotatably connected to the upper part of the bracket four, the push rod one is connected to the inner end of the electric push rod device one, the end of the push rod one is welded with a support plate two, the bracket three is welded to the outer side wall of the adjusting plate, and the support plate two is movably connected to the inside of the bracket three; the transverse plate is provided to support the lower part of the pushing mechanism, the pushing mechanism is used to automatically control the flipping adjustment of the push adjusting plate, and the bracket three and the bracket four are used to movably support the support plate two and the support plate three.

[0015] Preferably, the limiting and shielding mechanism also includes a driving mechanism and a fixing frame 1, the fixing frame 1 is welded to the top of the exhaust pipe in an inverted L-shaped structure, the driving mechanism is arranged on the top of the fixing frame 1, and a lead screw is fixed to the top left end of the limiting plate 1; the fixing frame 1 in an inverted L-shaped structure is used to stably support the driving mechanism, and the driving mechanism is used for automatic drive control.

[0016] Preferably, the driving mechanism includes a fixed cylinder and a shaft cylinder, the shaft cylinder is fixedly arranged on a fixed frame 1, the fixed cylinder is rotatably connected to the inside of the shaft cylinder, the lead screw is connected to the inside of the fixed cylinder through a thread, and a shaft disk 2 is fixedly arranged on the upper outside of the fixed cylinder; the arranged shaft cylinder is used to stably support the rotation adjustment of the fixed cylinder, and the rotation of the fixed cylinder is used to control the lifting and lowering adjustment of the lead screw through the thread.

[0017] Preferably, the driving mechanism also includes a bracket five, a driving motor, an extension shaft and an axle seat, the bracket five is welded on the top of the fixing frame one, the driving motor is fixedly arranged on the top of the bracket five, the output end of the driving motor is connected with a driving shaft, the lower end of the driving shaft is fixedly provided with a shaft disc one, the extension shaft is fixedly arranged at the bottom of the shaft disc one, the shaft seat is fixedly arranged on the top of the fixing frame one and is rotatably connected to the bottom of the extension shaft, and a gear chain is sleeved between the shaft disc one and the shaft disc two; the arranged driving motor is used to automatically control the rotation of the driving shaft and the shaft disc one, the shaft disc one is used to drive the shaft disc two to rotate through the gear chain, the extension shaft is used to stably assist in supporting the rotation of the driving shaft and the shaft disc one, and the shaft seat is used to smoothly support the rotation to prevent jamming.

[0018] Preferably, a slide groove 2 is provided at the right end of the limit plate 1, a mounting groove 2 is provided above the slide groove 2, the limit plate 2 is welded to the top of the limit sealing plate, a fixing frame 2 is welded to the top left end of the limit plate 1, the fixing frame 2 is an inverted L-shaped structure and an electric push rod device 2 is provided on the top, the bottom of the electric push rod device 2 is connected to a push rod 2, and the bottom of the push rod 2 is fixed to the upper end of the limit plate 2; the set slide groove 2 is used for sliding adjustment of the limit sealing plate, the mounting groove 2 is used for embedded sealing and placing the limit plate 2, the electric push rod device 2 and the push rod 2 are used for automatically controlling the lifting and lowering adjustment of the limit plate 2 and the limit sealing plate, and are adjusted up and down through the inside of the slide groove 2.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention has the following beneficial effects: the valve body composed of an intake pipe and an exhaust pipe in a right-angle structure is suitable for being installed on an exhaust gas recirculation valve of a ship diesel engine of a desulfurization tower; the valve sealing mechanism arranged on the upper right side of the intake pipe facilitates automatic control of the inward and outward movement adjustment of the moving rod, so that the sealing frame seals and blocks the inside of the exhaust pipe; combined with the limit blocking mechanism arranged above the exhaust pipe, it facilitates automatic control of the lifting and lowering adjustment of the limit plate, so that the filter plate is inserted into the sealing frame to filter and purify the exhaust gas; and the valve is sealed and blocked or opened for ventilation by slidingly adjusting the limit sealing plate, with high automation performance and safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall lower left three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall upper right three-dimensional structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal cross-sectional structure of the present invention;

[0024] Figure 4 It is a structural schematic diagram of another viewing angle of the internal section of the present invention;

[0025] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0026] Figure 6 It is an overall schematic diagram of the position limiting and shielding mechanism of the present invention;

[0027] Figure 7 It is a schematic diagram of the limit plate adjustment mechanism of the present invention;

[0028] Figure 8 It is a schematic diagram of the driving structure of the position limiting shielding mechanism of the present invention;

[0029] Fig. 9 It is a schematic diagram of the partial internal structure of the valve of the present invention.

[0030] In the figure, 1, valve body; 11, air inlet pipe; 12, exhaust pipe; 121, slide groove 1; 1211, mounting groove 1; 13, mounting plate; 2, valve sealing mechanism; 21, sealing frame; 211, ventilation groove; 212, storage groove; 22, moving rod; 221, bracket 1; 222, support plate 1; 223, spring rod; 224, limit cylinder; 23, adjustment plate; 231, bracket 2; 24, electric push rod device 1; 241, push rod 1; 2411, support plate 2; 2412, bracket 3; 242, support plate 3; 2421, bracket 4; 2422, support plate 4 ; 25. Horizontal plate; 3. Limit shielding mechanism; 31. Limit plate 1; 311. Filter plate; 312. Limit sealing plate; 313. Mounting slot 2; 3131. Slide slot 2; 3121. Limit plate 2; 32. Driving mechanism; 321. Fixed frame 1; 3211. Bracket 5; 322. Driving motor; 3221. Driving shaft; 3222. Shaft disc 1; 3223. Extension shaft; 3224. Shaft seat; 323. Shaft disc 2; 324. Fixed cylinder; 325. Shaft cylinder; 33. Fixed frame 2; 331. Electric push rod device 2; 332. Push rod 2; 34. Screw. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 9 The embodiment of the present invention provides a technical solution: a valve for exhaust gas recirculation of a marine diesel engine based on a desulfurization tower, comprising a valve body 1, a valve sealing mechanism 2 and a limit shielding mechanism 3, the valve body 1 is composed of an intake pipe 11 and an exhaust pipe 12 and is in a right-angle structure, the inner wall specification of the intake pipe 11 is larger than the inner wall specification of the exhaust pipe 12, and the outer ends of the intake pipe 11 and the exhaust pipe 12 are welded with mounting plates 13;

[0033] The valve sealing mechanism 2 is arranged on the upper right side of the air intake pipe 11. The valve sealing mechanism 2 includes a sealing frame 21 and a moving rod 22. The moving rod 22 penetrates and is connected to the upper right side of the air intake pipe 11. The sealing frame 21 is fixed to the inner side end of the moving rod 22. A receiving groove 212 is provided inside the sealing frame 21. Ventilation grooves 211 are provided on both sides of the sealing frame 21.

[0034] The limiting shielding mechanism 3 is arranged above the exhaust pipe 12, a slide groove 121 is opened above the exhaust pipe 12, a mounting groove 1211 is opened above the slide groove 121, and the limiting shielding mechanism 3 includes a limiting plate 31, a filter plate 311 is fixedly provided at the bottom left end of the limiting plate 31, filter holes are opened and distributed inside the filter plate 311, and the right end of the limiting plate 31 passes through a limiting sealing plate 312 that is slidably connected.

[0035] The valve body 1 composed of an intake pipe 11 and an exhaust pipe 12 in a right-angle structure is suitable for being installed on the exhaust gas recirculation valve of a ship diesel engine of a desulfurization tower. The valve sealing mechanism 2 arranged on the upper right side of the intake pipe 11 facilitates the automatic control of the inward and outward movement adjustment of the moving rod 22, so that the sealing frame 21 seals and blocks the inside of the exhaust pipe 12. Combined with the limiting blocking mechanism 3 arranged above the exhaust pipe 12, it is convenient to automatically control the lifting and lowering adjustment of the limiting plate 31, so that the filter plate 311 is inserted into the sealing frame 21 to filter and purify the exhaust gas, and the sealing and blocking or opening of the valve for ventilation is achieved by slidingly adjusting the limiting sealing plate 312, with high automation performance and safety and reliability.

[0036] As a further improvement, a limiting cylinder 224 is fixedly provided on the upper right side of the air intake pipe 11, the moving rod 22 penetrates and is connected to the inside of the limiting cylinder 224, a support plate 222 is fixedly provided on the upper outer end of the moving rod 22, and a spring rod 223 is fixedly distributed on the inner side wall of the support plate 222 and the outer side wall of the air intake pipe 11;

[0037] The limiting cylinder 224 is provided to limit the inward and outward movement adjustment of the moving rod 22, and the support plate 222 is used to support the double-group spring rod 223, and the spring rod 223 is used to stably support the moving rod 22 and buffer and reduce shock.

[0038] As a further improvement, a bracket 1 221 is welded to the outer end of the moving rod 22, a bracket 231 is fixedly provided at the lower right side of the air intake pipe 11, and an adjustment plate 23 is movably connected between the bracket 1 221 and the bracket 2 231 via a rotating shaft;

[0039] The support 1 221 and the support 2 231 are used to flexibly support the adjustment plate 23 to avoid jamming and blocking. The adjustment plate 23 is a retractable and adjustable structure.

[0040] Further improved, a horizontal plate 25 is provided below the bracket 231, and a pushing mechanism is provided between the upper outer end of the horizontal plate 25 and the outer side wall of the adjusting plate 23, the pushing mechanism includes an electric push rod device 1 24, a push rod 1 241, a bracket 3 2412, a bracket 4 2421 and a support plate 4 2422, the support plate 4 2422 is welded to the upper outer end of the horizontal plate 25, the bracket 4 2421 is welded to the upper part of the support plate 4 2422, the outer end of the electric push rod device 1 24 is welded with a support plate 3 242, the support plate 3 242 is rotatably connected to the upper part of the bracket 4 2421, the push rod 1 241 is connected to the inner side end of the electric push rod device 1 24, the end of the push rod 1 241 is welded with a support plate 2 2411, the bracket 3 2412 is welded to the outer side wall of the adjusting plate 23, and the support plate 2 2411 is movably connected to the inside of the bracket 3 2412;

[0041] The horizontal plate 25 is provided to support the bottom of the pushing mechanism, and the pushing mechanism is used to automatically control the flipping adjustment of the pushing adjustment plate 23. The bracket three 2412 and the bracket four 2421 are used to movably support the support plate two 2411 and the support plate three 242.

[0042] Further improved, the limiting shielding mechanism 3 also includes a driving mechanism 32 and a fixing frame 321, the fixing frame 321 is welded above the exhaust pipe 12 in an inverted L-shaped structure, the driving mechanism 32 is arranged on the top of the fixing frame 321, and a lead screw 34 is fixed on the top left end of the limiting plate 31;

[0043] The inverted L-shaped fixing frame 321 is used to stably support the driving mechanism 32, and the driving mechanism 32 is used for automatic driving control.

[0044] Further improved, the driving mechanism 32 includes a fixed cylinder 324 and a shaft cylinder 325, the shaft cylinder 325 is fixedly arranged on the fixed frame 1 321, the fixed cylinder 324 is rotatably connected to the inside of the shaft cylinder 325, the lead screw 34 is connected to the inside of the fixed cylinder 324 by a thread, and a shaft disc 2 323 is fixedly arranged on the upper part of the outside of the fixed cylinder 324;

[0045] The shaft cylinder 325 is provided to stably support the fixed cylinder 324 for rotation adjustment, and the rotation of the fixed cylinder 324 is used to control the lifting and lowering adjustment of the lead screw 34 through threads.

[0046] Further improved, the driving mechanism 32 also includes a bracket 5 3211, a driving motor 322, an extension shaft 3223 and a shaft seat 3224, the bracket 5 3211 is welded above the fixing bracket 1 321, the driving motor 322 is fixedly arranged above the bracket 5 3211, the output end of the driving motor 322 is connected with the driving shaft 3221, the lower end of the driving shaft 3221 is fixedly provided with a shaft disc 1 3222, the extension shaft 3223 is fixedly arranged at the bottom of the shaft disc 1 3222, the shaft seat 3224 is fixedly arranged above the fixing bracket 1 321 and is rotatably connected to the bottom of the extension shaft 3223, and a gear chain is sleeved between the shaft disc 1 3222 and the shaft disc 2 323;

[0047] The drive motor 322 is used to automatically control the rotation of the drive shaft 3221 and the shaft disc 1 3222. The shaft disc 1 3222 is used to drive the shaft disc 2 323 to rotate through a gear chain. The extension shaft 3223 is used to stably and auxiliary support the rotation of the drive shaft 3221 and the shaft disc 1 3222. The shaft seat 3224 is used to smoothly support the rotation to prevent jamming.

[0048] Specifically, the right end of the limiting plate 31 is provided with a second slide groove 3131, the upper part of the second slide groove 3131 is provided with a second mounting groove 313, the top of the limiting sealing plate 312 is welded with a second limiting plate 3121, the top left end of the limiting plate 31 is welded with a second fixing frame 33, the second fixing frame 33 is an inverted L-shaped structure and an electric push rod device 331 is provided on the upper part, the bottom of the electric push rod device 331 is connected with a second push rod 332, and the bottom of the second push rod 332 is fixedly arranged on the upper end of the second limiting plate 3121;

[0049] The set slide groove 3131 is used for sliding adjustment of the limit sealing plate 312, the installation groove 313 is used for embedded sealing to place the limit plate 3121, the electric push rod device 331 and the push rod 332 are used for automatic control of the lifting and lowering adjustment of the limit plate 3121 and the limit sealing plate 312, and run through the slide groove 3131 for up and down adjustment.

[0050] Working principle: The mounting plate 13 at the outer end of the air intake pipe 11 and the exhaust pipe 12 is connected to the exhaust gas recirculation valve of the marine diesel engine of the desulfurization tower;

[0051] After the exhaust gas enters from the intake pipe 11, it is discharged from the exhaust pipe 12, so that the exhaust gas recirculation valve can be unobstructed in the intake and exhaust;

[0052] When the exhaust gas needs to be purified, the electric push rod device 24 is started to automatically control the push rod 241 to extend and retract, thereby pushing the adjustment plate 23, and through the movable adjustment of the bracket 1 221 and the bracket 2 231, the moving rod 22 is pushed inward, so that the sealing frame 21 moves to the left and is pressed on the right end of the exhaust pipe 12, and ventilation is carried out through the ventilation slot 211;

[0053] At the same time, the driving motor 322 of the driving mechanism 32 is started, and the driving shaft 3221 and the shaft disc 1 3222 are automatically controlled to rotate, and the shaft disc 1 3222 is supported on the shaft seat 3224 by the extension shaft 3223 to rotate stably, and the shaft disc 1 3222 is driven to rotate by the gear chain, so that the fixing cylinder 324 is located inside the shaft cylinder 325 and rotates and adjusts, and the screw 34 is adjusted by the thread rotation, so that the screw 34 is adjusted downward, and the limit plate 1 31 and the filter plate 311 are controlled to be lowered and adjusted, and the limit plate 1 31 is sealed and limited above the installation groove 1211, and the filter plate 311 is adjusted to slide through the slide groove 121, and the filter plate 311 is inserted into the sealing frame 21 to filter and purify the exhaust gas;

[0054] When a seal is required, start the electric push rod device 2 331 to automatically control the push rod 2 332 to descend and adjust, control the limit plate 2 3121 and the limit sealing plate 312 to descend and adjust, the limit plate 2 3121 is sealed and limited above the installation groove 2 313, the limit sealing plate 312 slides through the slide groove 2 3131 and adjusts, the limit sealing plate 312 is inserted into the internal partition of the sealing frame 21, and the seal is blocked, thereby making the valve opening and closing adjustment more convenient.

[0055] The valve body 1 of the present invention, the air inlet pipe 11, the exhaust pipe 12, the slide groove 121, the installation groove 1211, the installation plate 13, the valve sealing mechanism 2, the sealing frame 21, the ventilation groove 211, the storage groove 212, the moving rod 22, the bracket 1 221, the support plate 1 222, the spring rod 223, the limit cylinder 224, the adjustment plate 23, the bracket 231, the electric push rod device 1 24, the push rod 1 241, the support plate 2411, the bracket 3 2412, the support plate 3 242, the bracket 4 242 1. Support plate 4 2422, horizontal plate 25, limit shielding mechanism 3, limit plate 1 31, filter plate 311, limit sealing plate 312, installation groove 2 313, slide groove 2 3131, limit plate 2 3121, drive mechanism 32, fixed frame 1 321, bracket 5 3211, drive motor 322, drive shaft 3221, shaft disc 1 3222, extension shaft 3223, shaft seat 3224, shaft disc 2 323, fixed cylinder 324, shaft cylinder 325, fixed frame 2 33, electric push rod installation The second device 331, the second push rod 332, and the lead screw 34 are all universal standard parts or parts known to technical personnel in this field. Their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods. The problem solved by the present invention is that the existing exhaust gas recirculation valve is not convenient for quick docking and installation on the ship diesel engine of the desulfurization tower, and the exhaust gas cannot be filtered and purified during the opening and closing operation inside the valve. The sealing and shielding operation inside the valve is relatively inconvenient, and the automation performance is low. The present invention is suitable for being installed on the exhaust gas recirculation valve of the ship diesel engine of the desulfurization tower through the mutual combination of the above-mentioned components, which is convenient for automatic control of the inward and outward movement adjustment of the moving rod, so that the sealing frame can seal and shield the inside of the exhaust pipe. Combined with the limit shielding mechanism arranged above the exhaust pipe, it is convenient to automatically control the lifting and lowering adjustment of the limit plate, so that the filter plate is inserted into the sealing frame to filter and purify the exhaust gas, and the sealing and shielding or opening of the valve for ventilation is realized by sliding and adjusting the limit sealing plate. The automation performance is high and it is safe and reliable.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A valve for exhaust gas recirculation of a marine diesel engine based on a desulfurization tower, comprising a valve body (1), a valve sealing mechanism (2) and a limit blocking mechanism (3), characterized in that: The valve body (1) is composed of an intake pipe (11) and an exhaust pipe (12) and is in a right-angle structure; the inner wall specification of the intake pipe (11) is larger than the inner wall specification of the exhaust pipe (12); and the outer ends of the intake pipe (11) and the exhaust pipe (12) are both welded with mounting plates (13); The valve sealing mechanism (2) is arranged at the upper right side of the air intake pipe (11), and comprises a sealing frame (21) and a moving rod (22), wherein the moving rod (22) penetrates and is connected to the upper right side of the air intake pipe (11), and the sealing frame (21) is fixedly arranged at the inner side end of the moving rod (22), and a storage groove (212) is provided inside the sealing frame (21), and ventilation grooves (211) are provided on both sides of the sealing frame (21); A limiting cylinder (224) is fixedly provided on the upper right side of the air intake pipe (11); the moving rod (22) penetrates and is connected to the interior of the limiting cylinder (224); a supporting plate (222) is fixedly provided on the upper outer end of the moving rod (22); and a spring rod (223) is fixedly provided on the inner side wall of the supporting plate (222) and the outer side wall of the air intake pipe (11); A bracket 1 (221) is welded to the outer end of the moving rod (22), a bracket 2 (231) is fixedly provided at the lower right side of the air intake pipe (11), and an adjustment plate (23) is movably connected between the bracket 1 (221) and the bracket 2 (231) via a rotating shaft; The position-limiting shielding mechanism (3) is arranged above the exhaust pipe (12); a slide groove (121) is provided above the exhaust pipe (12); a mounting groove (1211) is provided above the slide groove (121); the position-limiting shielding mechanism (3) comprises a position-limiting plate (31); a filter plate (311) is fixedly provided at the left end of the bottom of the position-limiting plate (31); filter holes are distributed inside the filter plate (311); and the right end of the position-limiting plate (31) penetrates and is slidably connected to a position-limiting sealing plate (312); The position limiting shielding mechanism (3) further comprises a driving mechanism (32) and a fixing frame (321); the fixing frame (321) is welded to the top of the exhaust pipe (12) in an inverted L-shaped structure; the driving mechanism (32) is arranged on the top of the fixing frame (321); and a lead screw (34) is fixedly arranged at the top left end of the position limiting plate (31); The driving mechanism (32) comprises a fixed cylinder (324) and a shaft cylinder (325); the shaft cylinder (325) is fixedly mounted on a first fixed frame (321); the fixed cylinder (324) is rotatably connected to the interior of the shaft cylinder (325); the lead screw (34) is connected to the interior of the fixed cylinder (324) by means of a thread; and a second shaft disc (323) is fixedly mounted on the upper portion of the exterior of the fixed cylinder (324); The driving mechanism (32) further comprises a bracket five (3211), a driving motor (322), an extension shaft (3223) and a shaft seat (3224); the bracket five (3211) is welded to the top of the fixing bracket one (321); the driving motor (322) is fixedly arranged on the top of the bracket five (3211); the output end of the driving motor (322) is connected through the driving shaft (3221); a shaft disc one (3222) is fixedly arranged at the lower end of the driving shaft (3221); the extension shaft (3223) is fixedly arranged at the bottom of the shaft disc one (3222); the shaft seat (3224) is fixedly arranged on the top of the fixing bracket one (321) and is rotatably connected to the bottom of the extension shaft (3223); and a gear chain is sleeved between the shaft disc one (3222) and the shaft disc two (323).

2. A desulfurization tower-based ship diesel engine exhaust gas recirculation valve according to claim 1, characterized in that: A transverse plate (25) is provided below the second bracket (231), and a pushing mechanism is provided between the upper outer end of the transverse plate (25) and the outer side wall of the adjusting plate (23), wherein the pushing mechanism comprises an electric push rod device (24), a push rod (241), a third bracket (2412), a fourth bracket (2421) and a support plate (2422), wherein the support plate (2422) is welded to the upper outer end of the transverse plate (25), and the fourth bracket (2421) is welded to the support plate (2422). At the top, the outer end of the electric push rod device 1 (24) is welded with a support plate 3 (242), and the support plate 3 (242) is rotatably connected to the top of the bracket 4 (2421). The push rod 1 (241) is connected to the inner end of the electric push rod device 1 (24), and the end of the push rod 1 (241) is welded with a support plate 2 (2411), the bracket 3 (2412) is welded to the outer wall of the adjustment plate (23), and the support plate 2 (2411) is movably connected to the inside of the bracket 3 (2412).

3. The exhaust gas recirculation valve for marine diesel engines based on a desulfurization tower according to claim 1, characterized in that: A second slide groove (3131) is provided at the right end of the limit plate (31), a second mounting groove (313) is provided above the second slide groove (3131), a second limit plate (3121) is welded to the top of the limit sealing plate (312), a second fixing frame (33) is welded to the left end of the top of the limit plate (31), the second fixing frame (33) is in an inverted L-shaped structure and an electric push rod device (331) is provided above, a second push rod (332) is connected to the bottom of the second electric push rod device (331), and the bottom of the second push rod (332) is fixed to the upper end of the second limit plate (3121).

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