An automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function

Abstract

This invention belongs to the field of pipe fittings, specifically disclosing an automatic anti-backflow drainage and exhaust pipe with integrated two-stage cooling function. It includes a pipe body and a cooling water jacket surrounding the body. One end of the pipe body is connected to an exhaust inlet, and the other end is connected to an exhaust outlet. Upstream of the pipe body, a movable piston and a fixed piston are installed. Two sealing pistons seal the entire pipe body and are connected by a sliding rod with an internal spring. A drainage groove is located below the movable piston, normally blocked by the movable piston, but exposed during seawater backflow for automatic drainage. Between the two sealing pistons is an exhaust rectification zone, which, together with the through holes on the sealing pistons, forms an expansion-type noise reduction structure to reduce exhaust noise. Downstream, the inner circumference of the pipe body is evenly distributed with small water spray holes, using water pressure to swirl, mix, vaporize, and cool the exhaust. This invention features a highly integrated pipe system that effectively addresses seawater backflow and water accumulation within the pipe while providing excellent exhaust cooling performance without occupying additional space.

Description

Technical Field

[0001] This invention belongs to the field of pipe fittings, specifically relating to an automatic anti-backflow drainage and exhaust pipe with integrated two-stage cooling function. Background Technology

[0002] Underwater exhaust is currently the ideal exhaust method for both surface ships and submarines. It not only reduces exhaust temperature to a certain extent but also lowers exhaust noise. Proper use of underwater exhaust can effectively prevent detection by radar and infrared instruments. However, underwater exhaust also faces many serious problems. It relies on exhaust pressure and flow velocity to overcome seawater pressure. If the exhaust pressure is lower than the seawater pressure, seawater can backflow into the diesel engine from the exhaust pipe, causing serious damage. Simultaneously, the high-temperature exhaust gases heat the pipes. Both the exhaust itself and the heated exposed pipes emit significant thermal radiation, raising localized sea surface temperatures and noticeably altering infrared thermal characteristics, which is detrimental to the ship's stealth capabilities. Therefore, reducing the exhaust temperature before it exits the hull to minimize its impact on sea surface temperature, and further preventing seawater backflow into the engine, is of paramount practical importance.

[0003] To address the issue of seawater backflow during underwater exhaust, several new designs have emerged in addition to the traditional method of installing check valves in the exhaust system. CN106194372B discloses an anti-backflow underwater exhaust pipe that increases the local exhaust velocity and raises the structural height by installing a raised unit in the middle section. This ensures that backflow does not occur under normal operating conditions of low speed and low exhaust volume. However, this method is only suitable for stable external water environments and cannot cope with situations where a sudden surge of seawater due to waves enters the engine. CN104514609B controls the opening and closing of the waterproof valve by controlling the high-pressure gas discharged from an additional air compressor to achieve the anti-backflow effect. However, this method cannot achieve automated backflow prevention when seawater enters, and the air compressor consumes additional energy and occupies a significant amount of limited space on the ship. CN114277908B uses a pressure diaphragm inside the pipe to sense pressure changes. After seawater backflow, a magnetic valve assembly connected to the pressure diaphragm controls high-pressure gas or liquid to drive an expansion bladder pre-installed inside the pipe to expand and seal the passage. However, this device cannot discharge water that has already flowed through the expansion bladder, nor can it automatically reset to allow exhaust flow again after the backflow of seawater decreases. Regarding exhaust cooling, current methods mainly use separate spray cooling devices in the exhaust system. Cooling designs on the pipes still primarily rely on water jacket structures, which do not fully utilize the pipe structure to achieve its cooling potential.

[0004] Therefore, to address the above issues, a small-area, simple and reliable, highly integrated exhaust pipe with automatic sealing and backflow prevention functions and the ability to drain internal water was designed. It also integrates two-stage cooling functions to improve the exhaust cooling effect of the pipe itself. Summary of the Invention

[0005] To address the shortcomings and improvement needs of existing underwater exhaust pipes, this invention provides a novel, highly integrated composite exhaust pipe that efficiently cools exhaust gas while providing automatic seawater backflow prevention and automatic drainage functions in a minimal volume.

[0006] This invention is achieved through the following technical solution: an automatic anti-backflow drainage and exhaust pipe with integrated two-stage cooling function, the pipe including a pipe body, an automatic drainage component and a cooling water jacket wrapped around the outside of the pipe body, the pipe body including, in the horizontal direction, an air intake buffer zone, an anti-backflow drainage rectification zone, a cooling zone and an exhaust buffer zone, the air intake buffer zone and the exhaust buffer zone being used for external air intake input end and exhaust output end, respectively;

[0007] The automatic drainage assembly includes a fixed piston and a movable piston that are sealed to the inner wall of the anti-backflow drainage rectification zone. Both the fixed piston and the movable piston have multiple exhaust holes in the radial direction. An exhaust rectification zone is formed between the fixed piston and the movable piston, and they are connected by a slide rod with a built-in elastic mechanism. A drainage groove is provided below the movable piston near the cooling zone. The length of the drainage groove is less than the maximum compressible length of the elastic mechanism.

[0008] The inner wall of the cooling zone is evenly distributed with multiple small water spray holes, which are connected to the cooling water jacket. The cooling water in the water jacket is sprayed, mixed, vaporized, cooled and exhausted by water pressure.

[0009] As a further preferred embodiment, the intake buffer and the exhaust buffer are connected to the intake input end and the exhaust output end respectively via an intake port flange and an exhaust port flange, and both the intake buffer and the exhaust buffer are in a descending stepped shape, with the bottom of the intake buffer being higher than the top of the exhaust buffer.

[0010] As a further preferred embodiment, the cooling water jacket includes a water jacket inlet flange and a water jacket outlet flange, wherein the water jacket inlet flange is located near the junction of the air intake buffer zone and the anti-backflow drainage rectification zone, and the water jacket outlet flange is located near the junction of the cooling zone and the exhaust buffer zone.

[0011] As a further preferred embodiment, the automatic hydrophobic assembly further includes a limiting mechanism, the limiting mechanism comprising a first limiting ring at the bottom of the intake buffer zone for fixing the fixed piston; a second limiting ring at the bottom of the cooling zone for restricting the movement of the movable piston toward the cooling zone; and a third limiting ring at the bottom of the exhaust rectification zone for restricting the movement of the movable piston toward the fixed piston.

[0012] As a further preferred embodiment, the fixed piston and the movable piston also have a plurality of connecting pipes communicating with the exhaust port, the outlets of the plurality of connecting pipes being close to the cooling zone, the outlets being curved upward with a bending angle of not less than 15°, and the lowest point of the outlets being not less than 1 / 2 the height of the movable piston.

[0013] As a further preferred embodiment, it also includes an automatic sealing assembly for sealing the air inlet of the connecting pipe. The automatic sealing assembly includes, in sequence, a movable rotating shaft located on the circumferential end face of the movable piston, a sector-shaped baffle, a connecting rod rotating shaft, a connecting rod, and a fixed rotating shaft fixed on the inner wall of the pipe between the movable piston and the fixed piston. The movable rotating shaft, sector-shaped baffle, connecting rod rotating shaft, connecting rod, and fixed rotating shaft are rotatably connected to each other.

[0014] As a further preferred embodiment, a piston drainage groove is also provided on the bottom of the movable piston near the fixed piston end. The width of the piston drainage groove is smaller than the width of the drainage groove. The bottom of the third limiting ring is provided with a notch with the same width as the drainage groove. The piston drainage groove and the notch are used to drain the water accumulated between the movable piston and the fixed piston after the movable piston is pushed by the backflow of seawater.

[0015] As a further preferred embodiment, the water spray hole forms an angle of 30-45 degrees with the central axis of the pipe body and an angle of 20-45 degrees with the circumference of the pipe body, so that the sprayed cooling water enters the pipe tangentially from the circumference towards the exhaust outlet.

[0016] As a further preferred embodiment, the system also includes a diaphragm valve and a drainage pipe that is vertically connected to the bottom of the drainage channel. One end of the diaphragm valve is connected to the bottom of the drainage pipe, and the other end is connected to the air inlet flange through a pipeline. The drainage pipe has a drainage outlet at a height of 1 / 3 to 1 / 2 of the diaphragm valve. The diaphragm in the diaphragm valve is used to block the inlet and outlet of the diaphragm valve body when the water level in the drainage pipe reaches more than 1 / 2 of the height of the drainage pipe.

[0017] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0018] 1. This invention utilizes two sealed pistons within the main pipe body, along with a drainage groove at the bottom, to form an automatic drainage structure. When seawater enters, it automatically drains the water from the pipe, preventing water accumulation and the risk of backflow into the engine. Under normal conditions, the drainage groove is sealed, preventing exhaust leakage. Furthermore, without adding complex structures, this invention fully utilizes the cooling water in the water jacket, employing a two-stage hybrid cooling method of convection cooling and swirling vaporization cooling. This significantly improves the cooling effect on the exhaust gas in addition to pipe cooling, reduces infrared radiation from the exhaust gas and pipe, and further ensures the safety and reliability of underwater exhaust.

[0019] 2. This invention fully utilizes the backflow of seawater itself as the driving force. Through the structural design of baffles and connecting rods, it achieves automatic pipe sealing when seawater surges in. The structure is simple but has excellent anti-seawater backflow performance. At the same time, the stepped downward structure of the pipe from the air inlet side to the air outlet side, and the curved upward structure of the exhaust hole that runs through the movable piston and the fixed piston, ensure the height difference between the upstream and downstream sides. Together with the automatic sealing assembly, these structures form a multi-layered anti-seawater backflow measure, which addresses the main problem of underwater exhaust and ensures the safety and reliability of underwater exhaust.

[0020] 3. The present invention forms an expansion-type noise reduction structure by using the connecting pipe in the sealed piston and the rectification area between the sealed pistons, which can reduce the noise generated by uneven speed of the exhaust gas.

[0021] 4. The preferred water spray hole configuration of the present invention allows the sprayed cooling water to enter the pipe tangentially from the circumference of the pipe towards the exhaust outlet, causing the atomized liquid to enter a rotating state and form a swirling spray. This facilitates the breakup of the spray droplets and more uniform diffusion in the pipe cross-section, improving the cooling effect. Furthermore, the water spray hole inclined towards the outlet prevents the sprayed water from entering the movable piston connecting pipe upstream of the pipe cooling zone, thus preventing the sprayed water from entering the upstream of the pipe. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the exhaust pipe of the present invention during normal exhaust.

[0023] Figure 2 This is a cross-sectional view of the exhaust pipe of the present invention when the automatic drainage and automatic sealing functions are activated after seawater backflow, and a side view of the exhaust connecting pipe and the automatic sealing assembly.

[0024] Figure 3 This is a cross-sectional view of the connecting slide between the two sealed pistons of the present invention.

[0025] Figure 4 This is a schematic diagram of the automatic sealing assembly in the exhaust pipe of the present invention.

[0026] Figure 5 This is a schematic diagram showing the inclination angle between the side surface and end face of the pipe for the water spray cooling hole in this invention.

[0027] Figure 6 This is a schematic diagram of the connection system of the drainage pipe and diaphragm valve in this invention.

[0028] The attached diagram is labeled as follows: Pipe body 1, inlet flange 2, outlet flange 3, cooling water jacket 4, water jacket inlet flange 5, water jacket outlet flange 6, water spray cooling hole 7, automatic drainage assembly 8, fixed piston 8-1, movable piston 8-2, first limit retaining ring 8-3, second limit retaining ring 8-4, third limit retaining ring 8-5, drainage groove 8-6, slide rod 8-7, spring 8-8, first connecting pipe 8-9, second connecting pipe 8-10, piston drainage groove 8-11, automatic sealing assembly 9, fan-shaped baffle 9-1, connecting rod 9-2, movable rotating shaft 9-3, fixed rotating shaft 9-4, connecting rod rotating shaft 9-5, drainage pipe 10, drainage outlet 10-1, diaphragm valve 11. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of the invention described below can be combined with each other as long as they do not conflict with each other. The following are specific embodiments:

[0030] Example 1

[0031] like Figure 1 In this embodiment, an exhaust pipe with integrated two-stage cooling function and automatic backflow prevention and drainage is provided, including a pipe body 1, an air inlet flange 2, an air outlet flange 3, a cooling water jacket 4, a water jacket inlet flange 5, a water jacket outlet flange 6, a water spray cooling hole 7, an automatic drainage assembly 8, and an automatic sealing assembly 9.

[0032] The main body 1 of the pipeline is the core of this embodiment and is used for ventilation and exhaust. The cooling water jacket 4 is wrapped around the pipeline body 1. The pipeline body 1 includes, in the horizontal direction, an air inlet buffer zone, an anti-backflow drainage and rectification zone, a cooling zone, and an exhaust buffer zone. The air inlet buffer zone and the exhaust buffer zone are connected to the air inlet end and the exhaust outlet end through the air inlet flange 2 and the air outlet flange 3, respectively. The water jacket inlet flange 5 is close to the junction of the air inlet buffer zone and the anti-backflow drainage and rectification zone. The water jacket outlet flange 6 is close to the junction of the cooling zone and the exhaust buffer zone. Cooling water flows in the cooling water jacket 4 and provides convective cooling for the pipeline body 1.

[0033] In this embodiment, the arrangement of the inlet and outlet flanges of the water jacket follows the principle of "bottom inlet and top outlet", so that the height of the inlet flange 5 is lower than that of the outlet flange 6. This helps to fill the water jacket with cooling water as much as possible, prevents the cooling water from being interrupted, and enhances the cooling effect of the water jacket.

[0034] Both the intake buffer zone and the exhaust buffer zone are in a descending stepped shape, with the bottom of the intake buffer zone being higher than the top of the exhaust buffer zone. This helps to prevent seawater flowing back into the exhaust outlet from flowing further into the engine, thus providing an anti-backflow function.

[0035] The automatic drainage assembly 8 is installed in the horizontal section between the stepped downward sections at the inlet and outlet. It includes a fixed piston 8-1 and a movable piston 8-2. The fixed piston 8-1 is installed at the end of the anti-backflow drainage rectification area near the intake buffer zone and is fixed in position by two upper and lower first limiting rings 8-3 set in the anti-backflow drainage rectification area. The movable piston 8-2 is installed at the end of the anti-backflow drainage rectification area near the cooling area and is restricted from moving towards the intake buffer zone by a second limiting ring 8-4 set in the anti-backflow drainage rectification area and a third limiting ring 8-5 restricted from moving towards the fixed piston. A certain distance is left between the limiting rings 8-4 and 8-5 so that the movable piston 8-2 can only move between the two rings.

[0036] Both the fixed piston 8-1 and the movable piston 8-2 are made of low-density materials to reduce their weight and facilitate being propelled by seawater.

[0037] A drainage groove 8-6 is provided in front of the second limiting ring 8-4 of the main pipe body 1. The length of the drainage groove is slightly less than the length of the movable piston 8-2, so that the drainage groove can be completely blocked when the movable piston 8-2 is in close contact with the limiting ring 8-4. The drainage groove runs through the cooling water jacket 4 and connects to the outside. Attention should be paid to the sealing of the water jacket 4 at this point to prevent the cooling water in the water jacket from leaking out.

[0038] The distance between the second limiting ring 8-4 and the third limiting ring 8-5 should be such that when the movable piston 8-2 is close to the second limiting ring 8-4, it completely blocks the drainage groove 8-6, and when it is close to the third limiting ring 8-5, it completely leaks out of the drainage groove 8-6.

[0039] The movable piston 8-2 is connected to the fixed piston 8-1 via a slide rod 8-7. The slide rod 8-7 can slide freely into the threaded rigid pipe of the fixed piston 8-1. The slide rod has a built-in spring 8-8. The spring preload can push the movable piston 8-2 to the second limit ring 8-4. The elastic coefficient of the spring 8-8 should be such that when the backflowing seawater pushes the movable piston, it can push the movable piston 8-2 to the third limit ring 8-5. This ensures that when the main body of the pipeline 1 is working normally, the movable piston 8-2 can be in a position that can block the drainage channel 8-6, while when the seawater backflows, the pushing force on the movable piston 8-2 can expose the drainage channel 8-6 ​​for automatic drainage.

[0040] The fixed piston 8-1 has four exhaust holes, from which a first connecting pipe 8-9 extends upward at a 15-degree angle towards the exhaust outlet, without interfering with the installed sliding rod 8-7. The movable piston 8-2 also has four exhaust holes, from which a second connecting pipe 8-10 extends upward towards the exhaust outlet. The lowest point of the exhaust outlet of the connecting pipe is not lower than half the height of the sealing piston. The upward curve of the first connecting pipe 8-9 and the second connecting pipe 8-10 raises the height of the exhaust outlet, preventing seawater from flowing forward through the first connecting pipe 8-9 when it backflows into the pipe, thus preventing backflow. Simultaneously, it increases the area of ​​the thrust exerted by the backflowing seawater on the movable piston 8-2. After the seawater hits the body of the second connecting pipe 8-10 and the end face of the movable piston 8-2, it pushes the movable piston 8-2 towards the exhaust inlet, exposing the drainage groove 8-6 and automatically draining water from the pipe.

[0041] Furthermore, a piston drainage groove 8-11 is formed at the bottom of the movable piston 8-2. The inlet of the piston drainage groove 8-11 is the end face of the movable piston 8-2 near the exhaust inlet, connecting the area between the two sealed pistons. The outlet is at the bottom of the movable piston near the intake buffer zone, and its width should be slightly smaller than the width of the drainage groove 8-6. When the movable piston 8-2 is in close contact with the second limiting ring 8-4, the outlet of the piston drainage groove 8-11 is blocked by the inner wall of the pipe body 1 to prevent exhaust leakage. When the movable piston 8-2 is in close contact with the third limiting ring 8-5, the outlet of the piston drainage groove 8-11 is exposed, connecting to the drainage groove, which helps to drain the water accumulated between the two sealed pistons and enhances the water-draining performance.

[0042] Furthermore, the bottom of the third limiting ring 8-5 has a notch with a width equal to the width of the drainage groove, allowing water accumulated in the area between the two sealed pistons to flow and be discharged at the drainage groove 8-11 between the pistons.

[0043] The automatic sealing assembly 9 is installed between the movable piston 8-2 and the fixed piston 8-1. One assembly includes a sector-shaped baffle 9-1, a connecting rod 9-2, a movable shaft 9-3, a fixed shaft 9-4, and a connecting rod shaft 9-5. The movable shaft 9-3 is installed on the end face of the movable piston 8-2 near the intake buffer zone, located outside the exhaust port, and can move with the movable piston 8-2. The fixed shaft 9-4 is installed on the main body of the pipe between the movable piston 8-2 and the fixed piston 8-1, and its position is fixed. One end of the sector-shaped baffle 9-1 rotates around the movable shaft 9-3, and one end of the connecting rod 9-2 rotates around the fixed shaft 9-4. The other ends of the baffle 9-1 and the connecting rod 9-2 are connected by the connecting rod shaft 9-5. Thus, when the movable piston moves toward the third limit ring 8-5, the baffle 9-1 will rotate around the rotating shaft 9-3 under the drive of the connecting rod 9-2 and fit tightly against the end face of the movable piston 8-2, automatically sealing the exhaust hole.

[0044] Furthermore, the number of automatic sealing assemblies 9 should be equal to the number of second connecting pipes 8-10, and one set of assemblies 9 should be installed on each exhaust port of the movable piston 8-2 to completely seal the exhaust pipe in the event of seawater backflow.

[0045] As a further preferred embodiment, the area between the movable piston 8-2 and the fixed piston 8-1 is the exhaust rectification area, and sufficient distance should be maintained. The first connecting pipe 8-9, the second pipe 8-10, and the exhaust rectification area together form an expansion-type silencing structure. The sound wave reflection and interference caused by the contraction of the flow area when the exhaust enters the connecting pipe and the expansion of the flow area when entering the rectification area are reduced, thereby reducing exhaust noise caused by uneven speed.

[0046] The water spray cooling holes 7 are a number of small holes evenly arranged circumferentially on the inner wall of the main pipe 1. The number and distribution of the holes can be changed according to the cooling requirements. The holes connect the cooling water jacket 4 and the exhaust channel. The cooling water in the cooling water jacket is sprayed into the exhaust channel under the action of water pressure, which plays a role in mixing and vaporizing to cool the exhaust.

[0047] Specifically, the water spray cooling hole 7 is at an angle of 30°-45° to the central axis of the pipe body, and also deviates from the pipe circumference by 20-45 degrees, so that the cooling water is sprayed tangentially into the pipe body from the circumference along the exhaust flow direction, causing the atomized liquid to enter a rotating state to form a swirling spray, which is conducive to the breakup of spray droplets and more uniform diffusion in the pipe cross section, thereby improving the cooling effect.

[0048] Specifically, the water spray cooling holes 7 are arranged downstream of the automatic drainage assembly 8, so that the anti-backflow and automatic drainage functions are equally effective for the unevaporated cooling water after spraying, thus avoiding the risk of backflow of the cooling water itself.

[0049] Furthermore, the drainage channel is connected to a vertical drainage pipe 10, the bottom of which is equipped with the diaphragm actuator of a diaphragm valve 11. The inlet and outlet of the diaphragm valve are connected to the upstream of the pipe in the exhaust system. A drainage outlet 10-1 is located at 1 / 3-1 / 2 of the height of the drainage pipe 10. When there is no seawater backflow, the inlet and outlet of the diaphragm valve 11 remain open, allowing normal exhaust flow. When backflowing seawater is discharged from the drainage channel 8-6 ​​into the drainage pipe 10, it will press down on the diaphragm in the diaphragm valve 11. When the water level in the drainage pipe 10 reaches more than 1 / 2 of the drainage pipe height, the diaphragm should seal the inlet and outlet of the diaphragm valve 11 under water pressure to further prevent seawater from entering the engine. When the backflowing water volume decreases and the water level in the drainage pipe drops, the diaphragm is automatically pushed back to its original position under the spring force of the diaphragm valve 11, allowing exhaust to continue to flow. When the water level in the drainage pipe 10 is at the height of the drainage outlet 10-1, the diaphragm should be completely reset so as not to affect the normal discharge of exhaust gas.

[0050] The working process of this embodiment's automatic drainage and backflow prevention two-stage cooling exhaust pipe is as follows: When exhaust gas enters from the inlet, it flows along the pipe towards the outlet, undergoing convective cooling by the cooling water in the water jacket throughout the process. After passing through the through-hole, connecting pipe, and exhaust rectification area, the uneven velocity of the exhaust gas is rectified, reducing exhaust noise. The exhaust gas then passes through the automatic sealing and drainage assembly to the water spray cooling zone of the pipe. The cooling water droplets sprayed from the water jacket are broken up and evenly diffused into the pipe, fully mixing with the exhaust gas and absorbing heat to vaporize and cool it, thus enhancing the cooling effect on the exhaust gas compared to the water jacket cooling pipe. When seawater backflows into the pipe, the stepped structure of the pipe itself and the upward bending of the connecting pipe to raise the outlet height create a height difference between the upstream and downstream sides of the pipe, preventing the seawater from flowing further upstream, thus preventing backflow. Furthermore, the backflowing seawater pushes the movable piston, causing the fan-shaped baffle, driven by the connecting rod, to automatically seal all the vent holes of the movable piston, thus preventing seawater from flowing back upstream of the pipe and exposing the outlet of the drainage channel between the condensate trough and the piston, automatically draining the seawater inside the pipe and between the sealed pistons. Seawater discharged from the vent pipe through the condensate trough accumulates in the condensate pipe, pressurizing the diaphragm valve diaphragm at the bottom of the condensate pipe. When the water volume in the condensate pipe reaches a certain value, the diaphragm, under water pressure, completely seals the valve body inlet and outlet, thereby sealing the upstream of the vent pipe of this invention. After the seawater in the vent pipe is emptied, the movable piston automatically returns to its initial position under the action of the spring, sealing the condensate trough to prevent vent leakage. The fan-shaped baffle rotates away from the end face of the movable piston around the pivot, exposing the vent holes. The water level in the condensate pipe drops, and the water pressure on the diaphragm valve diaphragm decreases, so the diaphragm resets under the action of the spring, opening the valve body inlet and outlet, allowing normal venting.

[0051] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function, characterized in that, The pipeline includes a pipeline body, an automatic drainage component, and a cooling water jacket wrapped around the pipeline body. The pipeline body includes, in the horizontal direction, an air intake buffer zone, an anti-backflow drainage rectification zone, a cooling zone, and an exhaust buffer zone. The air intake buffer zone and the exhaust buffer zone are respectively used to connect to the external air intake input end and the exhaust output end. The automatic drainage assembly includes a fixed piston and a movable piston that are sealed to the inner wall of the anti-backflow drainage rectification zone. Both the fixed piston and the movable piston have multiple exhaust holes in the radial direction. An exhaust rectification zone is formed between the fixed piston and the movable piston, and they are connected by a slide rod with a built-in elastic mechanism. A drainage groove is provided below the movable piston near the cooling zone. The length of the drainage groove is less than the maximum compressible length of the elastic mechanism. The inner wall of the cooling zone is evenly distributed with multiple small water spray holes, which are connected to the cooling water jacket. The cooling water in the water jacket is sprayed, mixed, vaporized, cooled and exhausted by water pressure. The automatic hydrophobic assembly further includes a limiting mechanism, which includes a first limiting ring at the bottom of the intake buffer zone for fixing the fixed piston; a second limiting ring at the bottom of the cooling zone for restricting the movement of the movable piston toward the cooling zone; and a third limiting ring at the bottom of the exhaust rectification zone for restricting the movement of the movable piston toward the fixed piston. The fixed piston and the movable piston also have multiple connecting pipes that communicate with the exhaust port. The outlets of the multiple connecting pipes are close to the cooling zone. The outlets are bent upwards with a bending angle of not less than 15°. The lowest point of the outlet is not less than 1 / 2 the height of the movable piston. It also includes an automatic sealing assembly for sealing the air inlet of the connecting pipe. The automatic sealing assembly includes, in sequence, a movable rotating shaft located on the circumferential end face of the movable piston, a sector-shaped baffle, a connecting rod rotating shaft, a connecting rod, and a fixed rotating shaft fixed on the inner wall of the pipe between the movable piston and the fixed piston. The movable rotating shaft, sector-shaped baffle, connecting rod rotating shaft, connecting rod, and fixed rotating shaft are rotatably connected to each other.

2. The automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function according to claim 1, characterized in that, The intake buffer and the exhaust buffer are connected to the intake input end and the exhaust output end respectively through the intake port flange and the exhaust port flange. Both the intake buffer and the exhaust buffer are in a descending stepped shape, with the bottom of the intake buffer being higher than the top of the exhaust buffer.

3. The automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function according to claim 1, characterized in that, The cooling water jacket includes a water jacket inlet flange and a water jacket outlet flange. The water jacket inlet flange is located near the air intake buffer zone and the anti-backflow drainage rectification zone, and the water jacket outlet flange is located near the cooling zone and the exhaust buffer zone.

4. The automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function according to claim 1, characterized in that, A piston drainage groove is also provided on the bottom of the movable piston near the fixed piston. The width of the piston drainage groove is smaller than the width of the drainage groove. The bottom of the third limiting ring is provided with a notch with the same width as the drainage groove. The piston drainage groove and the notch are used to drain the water accumulated between the movable piston and the fixed piston after the movable piston is pushed by the backflow of seawater.

5. The automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function according to claim 1, characterized in that, The spray nozzle forms an angle of 30-45 degrees with the central axis of the main pipe body and an angle of 20-45 degrees with the circumference of the main pipe body, so that the sprayed cooling water enters the pipe tangentially from the circumference towards the exhaust outlet.

6. The automatic anti-backflow drainage and exhaust pipe integrating two-stage cooling function according to claim 2, characterized in that, It also includes a diaphragm valve and a drainage pipe that is vertically connected to the bottom of the drainage tank. One end of the diaphragm valve is connected to the bottom of the drainage pipe, and the other end is connected to the air inlet flange through a pipeline. The drainage pipe has a drainage outlet at a height of 1 / 3 to 1 / 2 of the diaphragm valve. The diaphragm in the diaphragm valve is used to block the valve body inlet and outlet when the water level in the drainage pipe reaches more than 1 / 2 of the drainage pipe height.

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