An anti-backflow device for the water washing tank of an explosion-proof diesel engine

Abstract

The present invention belongs to the technical field of anti-backflow of diesel engine water washing tanks, and particularly relates to an anti-backflow device for an explosion-proof diesel engine water washing tank. It includes an explosion-proof diesel engine 6 installed on a locomotive mounting frame and connected to an air filter 5, and the explosion-proof diesel engine 6 is connected to a water washing tank 3 through an exhaust gas treatment device 4; a water replenishment chamber 9 and a water washing chamber 8 are arranged inside the water washing tank 3, and a water storage area 11 and a float plug 10 are arranged in the inner cavity of the water washing chamber 8. The anti-backflow device for an explosion-proof diesel engine water washing tank provided by the present invention can effectively prevent the water in the water washing tank 3 from flowing back into the diesel engine internally, affecting the function of the diesel engine, increasing the safety performance of the locomotive, and prolonging the service life of the diesel engine.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-backflow of the water washing tank of a diesel engine, and particularly relates to an anti-backflow device for the water washing tank of an explosion-proof diesel engine. Background Art

[0002] With the country's emphasis on coal mine safety and the improvement of the degree of mechanized coal mining, the demand for explosion-proof diesel engines and their supporting coal mine equipment has increased significantly. The market demand is huge and the market development prospect is broad. As the power source of the locomotive, the explosion-proof diesel engine plays an important role in the locomotive. The performance of the explosion-proof diesel engine directly determines the overall performance of the locomotive.

[0003] The existing water washing tank, as a part of the explosion-proof system of the whole explosion-proof diesel engine, plays a crucial role. On the one hand, it reduces the temperature of the exhaust gas to meet the requirements of coal safety certification; on the other hand, it eliminates harmful substances in the exhaust gas to purify the exhaust gas and reduce environmental pollution; it can also significantly reduce the emission of flames and sparks, avoiding igniting flammable and explosive gases in the air and causing unnecessary accidents. However, the current technology cannot effectively prevent the water in the water washing tank from flowing back and damaging the diesel engine. The existing problems are: (1) When the locomotive climbs a slope and stops, the position of the water washing tank is higher than that of the diesel engine, and the water in the water washing tank will enter the interior of the diesel engine through the exhaust pipe; (2) When the load of the locomotive suddenly changes and causes the diesel engine to reverse, a pressure difference is generated between the interior of the water washing tank and the diesel engine, and the water flows back into the diesel engine. After the water enters the diesel engine, it causes great damage to the diesel engine. In the light case, it emulsifies the engine oil, promotes the wear of diesel engine components, generates noise and increases vibration, seriously affecting the service life of the diesel engine; in the heavy case, since water cannot be compressed, when the diesel engine is still working at high speed after the water enters the cylinder, it cannot compress the water directly during work, resulting in a series of problems such as the bending of the valve and connecting rod, the jamming of the piston, serious wear of the middle cylinder, and the bending of the crankshaft. The anti-backflow device for the water washing tank of the present invention can effectively prevent the water in the water washing tank from flowing back into the interior of the diesel engine, affecting the function of the diesel engine, increasing the safety performance of the locomotive, and prolonging the service life of the diesel engine. Summary of the Invention

[0004] In view of the above technical deficiencies, the purpose of the present invention is to provide an anti-backflow device for the water washing tank of an explosion-proof diesel engine, which can effectively prevent the water in the water washing tank from flowing back into the interior of the diesel engine, affecting the function of the diesel engine, increasing the safety performance of the locomotive, and prolonging the service life of the diesel engine.

[0005] To achieve the above technical effects, the present invention is realized through the following technical solutions:

[0006] The present invention provides an anti-backflow device for the water washing tank of an explosion-proof diesel engine, which includes an explosion-proof diesel engine connected to an air filter on a locomotive mounting frame, and the explosion-proof diesel engine is connected to a water washing tank through an exhaust gas treatment device; a water replenishing chamber and a water washing chamber are arranged inside the water washing tank, and a water storage area and a floating ball plug are arranged inside the cavity of the water washing chamber.

[0007] Further, the intake pipe is connected to the inner pipe through the intake pipe inlet located on the top end face of the water washing chamber, and a water storage area is arranged in the middle of the inner pipe; the inner pipe is connected to the inner cylinder, the inner pipe and the inner cylinder are vertically arranged in the inner cavity of the water washing chamber, and the floating ball plug is arranged in the inner cylinder.

[0008] Further, the diameter of the inner cylinder is larger than the diameters of the inner pipe and the floating ball plug, the diameter of the floating ball plug is larger than the diameter of the inner pipe, and the diameter of the floating ball plug is 35-75 mm.

[0009] Further, the lower part of the inner cylinder is sleeved in the inner cavity of the middle cylinder, the middle cylinder is fixed to the bottom end face of the water washing chamber, an outer cylinder is sleeved outside the middle cylinder, and through holes c are oppositely arranged at the bottom end of the outer cylinder.

[0010] Further, the inner cylinder, the middle cylinder and the outer cylinder are all hollow cylinders; the distance between the bottom end face of the inner cylinder and the bottom end face of the water washing chamber is 50-80 mm, the diameter of the middle cylinder is 30-50 mm larger than the diameter of the inner cylinder, and the outer cylinder is 30-80 mm larger than the diameter of the middle cylinder.

[0011] Further, a floating ball port is hermetically arranged at the bottom end face of the middle cylinder, and the diameter of the floating ball port is larger than the diameter of the floating ball plug.

[0012] Further, a partition board is vertically arranged between the water replenishing chamber and the water washing chamber, the periphery of the partition board is connected to the inner cavity wall of the water washing box, a through hole a is horizontally arranged at the bottom end of the partition board, and a through hole b is horizontally arranged at the top end of the partition board.

[0013] Further, a floating ball valve is arranged in the water replenishing chamber, and the height of the floating ball valve is lower than the height of the water storage area.

[0014] Further, a floating ball valve drain port is arranged at the bottom end face of the water replenishing chamber, an exhaust passage is arranged at the top end of the inner cavity of the water replenishing chamber, and the exhaust passage is connected to the exhaust pipe through an exhaust fence.

[0015] Compared with the prior art, the anti-backflow device for the water washing box of the explosion-proof diesel engine provided by the present invention has the following beneficial effects:

[0016] 1. The anti-backflow device for the water washing box of the explosion-proof diesel engine of the present invention effectively solves the problem of water backflow, reduces the failure rate of the diesel engine, prolongs its service life, improves the overall performance of the locomotive, and improves the production efficiency.

[0017] 2. The anti-backflow device for the water washing box of the explosion-proof diesel engine of the present invention reserves a floating ball port at the bottom of the water washing chamber for cleaning and replacing the floating ball plug, which is convenient for later maintenance. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0019] Figure 1 Schematic structural diagram of an anti-backflow device for a water washing tank of an explosion-proof diesel engine according to the present invention;

[0020] Figure 2 For Figure 1 Front view structural diagram of the water washing tank in

[0021] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0022] 1 - Exhaust pipe; 2 - Intake pipe; 3 - Water washing tank; 4 - Tail gas treatment device; 5 - Air filter; 6 - Explosion-proof diesel engine; 7 - Radiator; 8 - Water washing chamber; 9 - Water replenishing chamber; 10 - Float plug; 11 - Water storage area; 12 - Inner pipe; 13 - Outer cylinder; 14 - Inner cylinder; 15 - Middle cylinder; 16 - Through hole c; 17 - Float port; 18 - Through hole a; 19 - Through hole b; 20 - Float valve; 21 - Float valve drain port; 22 - Exhaust passage; 23 - Exhaust grille; 24 - Partition; 25 - Intake pipe inlet. Detailed implementation manners

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] As Figures 1-2 shown, the embodiment of the present application provides an anti-backflow device for a water washing tank of an explosion-proof diesel engine, including an explosion-proof diesel engine 6 installed on a locomotive mounting frame and connected to an air filter 8, and a tail gas treatment device 4 connected to a water washing tank 3. When the locomotive starts to run, the diesel engine inhales the air passing through the air filter 8. The diesel oil is pressurized to more than 10 MPa by a fuel injection pump and injected into the cylinder, and immediately ignites and burns spontaneously after mixing with the air. At the same time, waste gas is generated and enters the tail gas treatment device 4; the tail gas treatment device 4 is connected to the water washing tank 3. A water replenishing chamber 9 and a water washing chamber 8 are arranged inside the water washing tank 3. A water storage area 11 and a float plug 10 are arranged in the inner cavity of the water washing chamber 8. The tail gas enters the water washing chamber 8 and is cooled by water washing. If the water in the water washing chamber 8 is consumed too much, the water replenishing chamber 9 will supply water to the water washing chamber 8, and the water storage area 11 and the float plug 10 can prevent the water in the water washing chamber 8 from flowing back to the tail gas treatment device 4 and the explosion-proof diesel engine 6.

[0025] The intake pipe 2 is connected to the inner pipe 2 through the intake pipe inlet 25 located on the top surface of the water washing chamber 8. A water storage area 11 is provided in the middle of the inner pipe 12. The upper and lower end surfaces of the water storage area 11 are both connected to the inner pipe 12. The inner pipe 12 is connected to the inner cylinder 14. The inner pipe 12 and the inner cylinder 14 are vertically arranged in the inner cavity of the water washing chamber 8. A floating ball plug 10 is arranged in the inner cylinder 14. When the water level in the water washing chamber rises, the floating ball plug 10 will rise together with the water level.

[0026] The diameter of the inner cylinder 14 is larger than the diameters of the inner pipe 12 and the floating ball plug 10. The diameter of the floating ball plug 10 is larger than the diameter of the inner pipe 12. The diameter of the floating ball plug 10 is 35 - 75 mm. Since the diameter of the floating ball plug 10 is larger than the diameter of the inner pipe 12, when the floating ball plug 10 rises with the water level to the lower port of the inner pipe 2, the floating ball plug 10 will block the connection port between the inner cylinder 14 and the inner pipe 2, preventing the water in the water washing chamber 8 from flowing back into the explosion-proof diesel engine 6 through the intake pipe 2. The bottom end surface of the middle cylinder 15 is hermetically provided with a floating ball port 17. The diameter of the floating ball port 17 is larger than the diameter of the floating ball plug 10. The floating ball plug 10 is in long-term contact with high-temperature exhaust gas and is relatively easy to be damaged. Therefore, a floating ball port 17 is provided in the area of the bottom end surface of the water washing chamber 8 facing the floating ball plug 10. The floating ball plug 10 can be replaced by opening the floating ball port 17.

[0027] The outer part of the bottom end of the inner cylinder 14 is sleeved with a middle cylinder 15. The middle cylinder 15 is fixed to the bottom end surface of the water washing chamber 8. The outer parts of the inner cylinder 14 and the middle cylinder 15 are sleeved with an outer cylinder 13. Through holes c16 are oppositely arranged at the bottom end of the outer cylinder 13. The inner cylinder 14, the middle cylinder 15, and the outer cylinder 13 are all hollow cylinders. The distance between the bottom end surface of the inner cylinder 14 and the bottom end surface of the water washing chamber 8 is 50 - 80 mm. The diameter of the middle cylinder 15 is 30 - 50 mm larger than the diameter of the inner cylinder 14. The outer cylinder 13 is 30 - 80 mm larger than the diameter of the middle cylinder 15. When the exhaust gas enters the water washing chamber 8 through the intake pipe 2 and the inner pipe 12, the exhaust gas first enters the inner cylinder 14, enters the middle cylinder 15 through the gap between the bottom end of the inner cylinder 14 and the bottom end surface of the water washing chamber 8, then enters the outer cylinder 13 through the opening on the top end surface of the middle cylinder 15, and finally enters the water washing chamber from the opening at the top end of the outer cylinder 13. A partition 24 is vertically arranged between the water replenishing chamber 9 and the water washing chamber 8. The four sides of the partition 24 are connected to the inner cavity wall of the water washing tank 3. A through hole a18 is horizontally arranged at the bottom end of the partition 24, and a through hole b19 is horizontally arranged at the top end of the partition 24. Most of the exhaust gas in the water washing chamber enters the water replenishing chamber 9 through the through hole a18, and a small part escapes into the water replenishing chamber 9 through the through hole b19. The through hole a18 connects the water replenishing chamber 9 and the water washing chamber 8, making the water levels of the two at the same horizontal plane, and the through hole b19 can play a role in balancing the air pressure between the two.

[0028] A float valve 20 is provided in the water replenishing chamber. The height of the float valve 20 is lower than that of the water storage area 11. The float valve 20 can control the water level inside the entire water washing tank 3 not to exceed the height of the float valve. A float valve drain port 21 is provided at the bottom end surface of the water replenishing chamber 9. The float valve drain port 21 can drain the water inside the water washing tank 3. An exhaust passage 22 is provided at the top end of the inner cavity of the water replenishing chamber 9. The exhaust passage 22 is connected to the exhaust pipe 1 through an exhaust grille 23. The waste gas entering the water replenishing chamber 9 from the water washing chamber 8 is discharged into the atmosphere through the exhaust passage 22, the exhaust grille 23 and the exhaust pipe 1 in sequence. Among them, the exhaust grille 23 plays a role in preventing fire, preventing a fire from occurring when the waste gas contacts the air during the discharge process. Both the tail gas treatment device 4 and the intake pipe 2 are double-layer pipes. The radiator 7 is connected to the outer layer pipe, and the explosion-proof diesel engine 6 is connected to the inner layer pipe. The liquid in the radiator 7 forms a reflux with the outer layer pipe, continuously cooling the waste gas generated by the explosion-proof diesel engine 6.

[0029] When the locomotive climbs a slope and stops, the position of the water washing tank 3 is higher than that of the explosion-proof diesel engine 6, resulting in a height difference, causing the liquid level on the right side of the water washing tank 3 to rise. The float plug 10 rises with the rise of the liquid level and blocks the connection port between the inner cylinder 14 and the inner pipe 12. If a small amount of water passes through, it can be stored in the water storage area 11 to prevent the water from entering the explosion-proof diesel engine 6 through the tail gas treatment device 4. When the load of the locomotive suddenly changes and causes the explosion-proof diesel engine 6 to reverse, a pressure difference is generated inside the water washing tank 3 and the explosion-proof diesel engine 6. The atmospheric pressure inside the water washing tank 3 is greater than the atmospheric pressure inside the explosion-proof diesel engine 6. The float plug 10 rises with the rise of the liquid level inside the inner cylinder 14, and the float plug blocks the connection port between the inner cylinder 14 and the inner pipe 12 to prevent the water from flowing back into the explosion-proof diesel engine 6. The anti-backflow device for the explosion-proof diesel engine water washing tank of the present invention effectively solves the problem of water backflow, reduces the failure rate of the diesel engine, prolongs its service life, improves the overall performance of the locomotive, and improves the production efficiency.

[0030] The embodiments described above are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention device.

Claims

1. An anti-backflow device for the water washing tank of an explosion-proof diesel engine, characterized in that: It includes that an explosion-proof diesel engine (6) is arranged on a locomotive mounting bracket and connected to an air filter (5), and the explosion-proof diesel engine (6) is connected to a water washing tank (3) through an exhaust gas treatment device (4); a water replenishing chamber (9) and a water washing chamber (8) are arranged inside the water washing tank (3), and a water storage area (11) and a float plug (10) are arranged inside the cavity of the water washing chamber (8). An air inlet pipe (2) is connected to an inner pipe (12) through an air inlet pipe inlet (25) located on the top surface of the water washing chamber (8), and a water storage area (11) is arranged in the middle of the inner pipe (12); the inner pipe (12) is connected to an inner cylinder (14), and the inner pipe (12) and the inner cylinder (14) are vertically arranged inside the cavity of the water washing chamber (8), and the float plug (10) is arranged inside the inner cylinder (14). The diameter of the inner cylinder (14) is larger than the diameters of the inner pipe (12) and the float plug (10), the diameter of the float plug (10) is larger than the diameter of the inner pipe (12), and the diameter of the float plug (10) is 35 - 75 mm. The lower part of the inner cylinder (14) is sleeved inside the cavity of a middle cylinder (15), the middle cylinder (15) is fixed to the bottom end surface of the water washing chamber (8), an outer cylinder (13) is sleeved outside the middle cylinder (15), and through holes c (16) are oppositely arranged at the bottom end of the outer cylinder (13). The inner cylinder (14), the middle cylinder (15) and the outer cylinder (13) are all hollow cylinders; the distance between the bottom end surface of the inner cylinder (14) and the bottom end surface of the water washing chamber (8) is 50 - 80 mm, the diameter of the middle cylinder (15) is 30 - 50 mm larger than the diameter of the inner cylinder (14), and the diameter of the outer cylinder (13) is 30 - 80 mm larger than the diameter of the middle cylinder (15). A float opening (17) is hermetically arranged at the bottom end surface of the middle cylinder (15), and the diameter of the float opening (17) is larger than the diameter of the float plug (10).

2. The anti-backflow device for the water washing tank of an explosion-proof diesel engine according to claim 1, characterized in that: A partition plate (24) is vertically arranged between the water replenishing chamber (9) and the water washing chamber (8), the periphery of the partition plate (24) is connected to the inner cavity wall of the water washing tank (3), a through hole a (18) is horizontally arranged at the bottom end of the partition plate (24), and a through hole b (19) is horizontally arranged at the top end of the partition plate (24).

3. An anti-backflow device for a water washing tank of an explosion-proof diesel engine according to claim 1, characterized in that: A float valve (20) is arranged in the water replenishing chamber, and the height of the float valve (20) is lower than the height of the water storage area (11).

4. The anti-backflow device for the water washing tank of an explosion-proof diesel engine according to claim 1, characterized in that: A float valve drain port (21) is arranged at the bottom end surface of the water replenishing chamber (9), an exhaust passage (22) is arranged at the top end of the inner cavity of the water replenishing chamber (9), and the exhaust passage (22) is connected to an exhaust pipe (1) through an exhaust grid (23).

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