Explosion-proof engine waste gas treatment box capable of preventing cooling water from flowing backwards

Abstract

The utility model relates to an anti-explosion engine waste gas treatment box capable of preventing cooling water from flowing backwards, which comprises a water washing box, an exhaust pipe which is connected to the water washing box and extends into the cooling water, and a fire-retardant fence which is arranged on the water washing box, and at least one air inlet one-way valve is arranged on the outer wall of the exhaust pipe above the cooling water in the water washing box. One end of the air inlet one-way valve is communicated with an inner cavity of the exhaust pipe, the other end is communicated with an inner cavity of the washing box, and the air inlet one-way valve is opened towards the inner cavity of the exhaust pipe. When the fire-retardant fence is seriously blocked and exhaust is unsmooth, positive pressure is formed in an inner cavity above cooling water in the washing tank, and if an engine suddenly stops and flames out, the pressure in the exhaust pipe is sharply reduced, so that pressure difference is formed between the inner cavity of the washing tank and the inner cavity of the exhaust pipe, and high-pressure waste gas drives the air inlet one-way valve to be opened towards the inner cavity of the exhaust pipe; the pressure of the inner cavity of the washing tank and the pressure of the inner cavity of the exhaust pipe are further balanced, and therefore the situation that cooling water flows backwards into the engine due to the pressure difference is avoided.

Description

Technical Field

[0001] The utility model relates to an explosion-proof engine water washing box with a pressure balancing device, belongs to the technical field of auxiliary transportation of explosion-proof diesel engines for mining, and specifically refers to an explosion-proof engine exhaust gas treatment box which prevents cooling water from flowing back. Background Art

[0002] Explosion-proof diesel engine monorail cranes, explosion-proof diesel engine trackless rubber-tyred vehicles, and explosion-proof diesel engine crawler transporters, among other mining auxiliary transportation products, rely on explosion-proof diesel engines as their power source. According to coal mine explosion-proof product specifications, exhaust from explosion-proof diesel engines must be treated with water in an exhaust gas treatment tank before being discharged into the roadway environment.

[0003] When an explosion-proof diesel engine is operating normally, there is a certain level of cooling water in the exhaust gas treatment box. The high-temperature exhaust gas discharged by the engine enters the cooling water through the exhaust pipe with a water jacket. The exhaust gas exchanges heat with the cooling water and cools down before being discharged through the fire barrier. However, due to the small gap between the fire barrier, it is very easy to become blocked, resulting in poor exhaust flow or complete blockage. When the fire barrier is severely blocked, positive pressure is generated in the exhaust gas treatment box when the engine is running. If the engine is suddenly stopped and the flameout is turned off, the pressure in the engine exhaust pipe drops sharply. Under the action of pressure, the cooling water in the exhaust gas treatment box will flow back into the engine exhaust pipe and then into the engine, causing damage to the engine. Utility Model Content

[0004] In response to the deficiencies in the prior art, the utility model provides an exhaust gas treatment box that can automatically adjust the pressure balance between the exhaust gas treatment box and the exhaust pipe. In this way, when the fire barrier of an explosion-proof engine is blocked, the exhaust gas treatment box can automatically adjust the pressure balance between the exhaust pipe and the exhaust pipe, thereby preventing cooling water from entering the engine and causing engine damage.

[0005] The utility model is realized through the following technical scheme: an explosion-proof engine exhaust gas treatment box that prevents cooling water backflow, comprising a water washing box, an exhaust pipe arranged on the water washing box and extending into the cooling water at one end, and a fire barrier arranged on the water washing box, at least one air intake one-way valve is provided on the outer wall of the exhaust pipe above the cooling water in the water washing box, one end of the air intake one-way valve is connected to the inner cavity of the exhaust pipe, and the other end is connected to the inner cavity of the water washing box, and the air intake one-way valve opens in the direction of the inner cavity of the exhaust pipe.

[0006] In this solution, when the fire barrier is severely blocked and the exhaust is not smooth, a positive pressure is formed in the inner cavity above the cooling water in the water wash tank. If the engine is suddenly stopped and the flameout occurs, the pressure in the exhaust pipe drops sharply, causing a pressure difference between the inner cavity of the water wash tank and the inner cavity of the exhaust pipe. The high-pressure exhaust gas drives the intake one-way valve to open the inner cavity of the exhaust pipe, connecting the inner cavity of the water wash tank and the inner cavity of the exhaust pipe, thereby balancing the pressure in the inner cavity of the water wash tank and the inner cavity of the exhaust pipe, thereby preventing cooling water from flowing back into the engine due to the pressure difference.

[0007] As an optimization, the air intake one-way valve includes a valve body and a sealing ball. The valve body is provided with a movable chamber that accommodates the sealing ball. The sealing ball moves axially within the movable chamber. One end of the movable chamber is provided with a first vent hole that connects to the inner cavity of the water washing tank, and the other end is provided with a second vent hole that connects to the inner cavity of the exhaust pipe. The outer diameter of the sealing ball is smaller than the inner diameter of the movable chamber and larger than the apertures of the first and second vent holes. The end surface of the movable chamber near the second vent hole is provided with an air intake groove that connects to the second vent hole. In this optimization solution, the sealing ball is larger than the apertures of the first and second vent holes, which can seal the first and second vent holes. When the sealing ball seals the second vent hole, the second vent hole and the movable chamber are connected through the air intake groove, thereby connecting the inner cavity of the water washing tank and the inner cavity of the exhaust pipe, thereby achieving one-way air intake.

[0008] As an optimization, the active cavity is connected to the second vent hole via a bevel transition, and a plurality of the air intake grooves are distributed circumferentially along the bevel. This optimization solution uses a bevel transition to facilitate airflow through the air intake grooves, and improves air intake efficiency through multiple air intake grooves.

[0009] As an optimization, the valve body comprises a cylindrical base and a valve cover. One end of the base is fixedly connected to the outer wall of the exhaust pipe, and the valve cover is threadedly connected to the other end of the base. The movable chamber and the second vent are provided on the base, and the first vent is provided on the valve cover. This optimization solution facilitates assembly of the valve body.

[0010] As an optimization, the end of the first vent hole close to the active cavity is a bell mouth. This optimization solution can improve the sealing effect between the sealing ball and the first vent hole.

[0011] As an optimization, the exhaust pipe includes an exhaust riser and exhaust cross pipe. The lower end of the exhaust riser extends into the cooling water, and one end of the exhaust cross pipe is connected to the upper end of the exhaust riser via an elbow. The intake check valve is fixed to the exhaust riser. This optimization solution connects the exhaust cross pipe to the engine, and the exhaust riser pipe transports the exhaust gas from the engine to the cooling water for heat exchange and cooling.

[0012] As an optimization, the exhaust riser pipe located in the cooling water has multiple exhaust holes evenly distributed along the circumference. This optimization solution improves the exhaust gas discharge efficiency through the evenly distributed exhaust holes along the circumference, allowing the exhaust gas to fully contact the cooling water, thereby improving the heat exchange efficiency.

[0013] As an optimization, the end of the exhaust cross pipe away from the exhaust vertical pipe is connected to a flange through an elbow. The flange of this optimization solution is convenient for connection with the exhaust port of the engine.

[0014] The beneficial effects of the present invention are as follows: when the fire barrier is severely blocked and the exhaust is not smooth, a positive pressure is formed in the inner cavity above the cooling water in the water washing box. If the engine is suddenly stopped and the flameout occurs, the pressure in the exhaust pipe drops sharply, causing a pressure difference between the inner cavity of the water washing box and the inner cavity of the exhaust pipe. The high-pressure exhaust gas drives the intake one-way valve to open toward the inner cavity of the exhaust pipe, connecting the inner cavity of the water washing box and the inner cavity of the exhaust pipe, thereby balancing the pressure in the inner cavity of the water washing box and the inner cavity of the exhaust pipe, thereby preventing cooling water from flowing back into the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional view of the utility model;

[0016] Figure 2 for Figure 1 A magnified view of part A;

[0017] Figure 3 Schematic diagram of the three-dimensional structure of the valve body;

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of the utility model;

[0019] As shown in the figure:

[0020] 1. Water washing box, 2. Fire barrier, 3. Exhaust pipe, 31. Exhaust vertical pipe, 32. Exhaust horizontal pipe, 33. Elbow, 34. Flange, 35. Exhaust hole, 4. Air intake check valve, 41. Valve cover, 411. First air vent, 42. Base, 421. Movable cavity, 422. Second air vent, 423. Air intake trough, 43. Sealing ball. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0022] like Figures 1 to 4 As shown, an explosion-proof engine exhaust gas treatment box that prevents cooling water backflow includes a water washing box 1, an exhaust pipe 3 arranged on the water washing box 1 and with one end extending into the cooling water, and a fire barrier 2 arranged on the water washing box 1.

[0023] Specifically, the fire barrier 2 is fixedly mounted on the top of the water wash tank 1 to discharge exhaust gas after water washing. The exhaust pipe 3 includes an exhaust riser 31 and an exhaust cross pipe 32. The lower end of the exhaust riser 31 extends into the cooling water. Multiple exhaust holes 35 are evenly distributed along the circumference of the wall of the exhaust riser 31 located in the cooling water. The upper end of the exhaust riser 31 extends outside the water wash tank 1 and is fixed to the top of the water wash tank. One end of the exhaust cross pipe 32 is connected to the upper end of the exhaust riser 31 via an elbow 33. The end of the exhaust cross pipe 32 away from the exhaust riser 31 is connected to a flange 34 via the elbow 33. The exhaust cross pipe 32 is connected to the engine exhaust port via the flange 34. In this embodiment, the elbow 33 is a 90° elbow. The exhaust cross pipe 32 is a horizontal pipe with a water jacket, which initially cools the exhaust gas passing through the exhaust cross pipe. This is a common configuration for existing engine exhaust pipes and will not be described in detail here.

[0024] At least one air intake one-way valve 4 is provided on the outer wall of the exhaust pipe 3 above the cooling water in the water washing box 1. One end of the air intake one-way valve 4 is connected to the inner cavity of the exhaust pipe 3, and the other end is connected to the inner cavity of the water washing box 1, and the air intake one-way valve opens in the direction of the inner cavity of the exhaust pipe.

[0025] Specifically, the air intake check valve 4 includes a valve body and a sealing ball 43. The valve body is provided with an active cavity 421 for accommodating the sealing ball 43. The sealing ball moves axially in the active cavity. One end of the active cavity 421 is provided with a first air vent 411 connected to the inner cavity of the washing box 1, and the other end is provided with a second air vent 422 connected to the inner cavity of the exhaust pipe 3. The outer diameter of the sealing ball 43 is smaller than the inner diameter of the active cavity 421 and larger than the aperture of the first air vent 411 and the second air vent 422.

[0026] The valve body includes a cylindrical base 42 and a valve cover 41. One end of the base 42 is fixedly connected to the outer wall of the exhaust pipe 3. In this embodiment, the base is fixedly connected to the outer wall of the exhaust riser. The valve cover 41 is threadedly connected to the other end of the base 42. The active cavity 421 and the second vent 422 are defined in the base 42. The first vent 411 is defined in the valve cover 41. The end of the first vent 41 near the active cavity 421 is a bell-shaped mouth. The first vent, active cavity, and second vent are coaxially arranged.

[0027] An air intake groove 423 is provided on the end surface of the active cavity 421 near the second vent hole, communicating with the second vent hole 422. Specifically, the active cavity 421 and the second vent hole 422 are connected via an inclined surface transition, and a plurality of the air intake grooves 423 are distributed circumferentially on the inclined surface.

[0028] Working Principle: An intake check valve 4 is installed on the exhaust riser 31. During normal engine operation, exhaust gas flows through the exhaust cross pipe 32 and the exhaust riser 31, then exits through the exhaust hole 35 on the exhaust riser 31, where it exchanges heat with cooling water. After heat exchange, the exhaust gas passes through the fire barrier 2 and is discharged to the outside. At this point, the exhaust gas pressure in the exhaust riser 31 is higher than the pressure in the water wash tank 1. The exhaust gas pushes the sealing ball 43 of the intake check valve 4 to the left, blocking the first vent 411 and preventing the high-temperature exhaust gas from entering the water wash tank without being washed.

[0029] When the fire barrier 2 is severely blocked and the exhaust is not smooth, if the engine is suddenly stopped and the flameout occurs, the pressure in the exhaust pipe 3 drops sharply, while the pressure in the water washing tank 1 is high. Through the pressure difference, the exhaust gas in the water washing tank pushes the sealing ball 43 to move to the right, and the first vent is opened, so that the inner cavity of the water washing tank 1 and the inner cavity of the exhaust pipe 3 are connected, and the high-pressure exhaust gas in the water washing tank 1 flows into the exhaust pipe 3, forming a pressure balance, thereby preventing cooling water from flowing back into the engine, thereby ensuring the safety of engine use.

[0030] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An explosion-proof engine exhaust gas treatment box for preventing cooling water backflow, comprising a water washing box (1), an exhaust pipe (3) arranged on the water washing box and extending one end into the cooling water, and a fire barrier (2) arranged on the water washing box, characterized in that: At least one air intake check valve (4) is provided on the outer wall of the exhaust pipe (3) located above the cooling water in the water washing box (1), one end of the air intake check valve is connected to the inner cavity of the exhaust pipe, and the other end is connected to the inner cavity of the water washing box, and the air intake check valve opens in the direction of the inner cavity of the exhaust pipe.

2. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 1, characterized in that: The air intake one-way valve (4) comprises a valve body and a sealing ball (43). The valve body is provided with a movable cavity (421) for accommodating the sealing ball. The sealing ball moves axially in the movable cavity. One end of the movable cavity (421) is provided with a first vent hole (411) communicating with the inner cavity of the water washing box (1), and the other end is provided with a second vent hole (422) communicating with the inner cavity of the exhaust pipe (3). The outer diameter of the sealing ball is smaller than the inner diameter of the movable cavity and larger than the apertures of the first vent hole and the second vent hole. An air intake groove (423) communicating with the second vent hole is provided on the end surface of the movable cavity (421) close to the second vent hole.

3. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 2, characterized in that: The active cavity (421) and the second vent hole (422) are connected via an inclined surface transition, and a plurality of the air intake grooves (423) are distributed circumferentially on the inclined surface.

4. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 2, characterized in that: The valve body comprises a cylindrical base (42) and a valve cover (41); one end of the base is fixedly connected to the outer wall of the exhaust pipe (3); the valve cover is threadedly connected to the other end of the base; the movable cavity (421) and the second vent hole (422) are provided on the base (42); and the first vent hole (411) is provided on the valve cover (41).

5. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 4, characterized in that: The end of the first vent hole (411) close to the active cavity (421) is a bell mouth.

6. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 1, characterized in that: The exhaust pipe (3) comprises an exhaust vertical pipe (31) and an exhaust cross pipe (32). The lower end of the exhaust vertical pipe extends into the cooling water. One end of the exhaust cross pipe (32) is connected to the upper end of the exhaust vertical pipe (31) via an elbow (33). The air intake check valve (4) is fixed on the exhaust vertical pipe (31).

7. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 6, characterized in that: The exhaust vertical pipe (31) is located in the cooling water and has a plurality of exhaust holes (35) uniformly distributed along the circumferential direction on its wall.

8. The explosion-proof engine exhaust gas treatment box with anti-cooling water backflow according to claim 6, characterized in that: One end of the exhaust cross pipe (32) away from the exhaust vertical pipe is connected to a flange (34) via an elbow (33).

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