Water source switching waterproof hammer device

Abstract

The invention discloses a water source switching water hammer preventing device which comprises a communicating part, a water hammer preventing part, a water hammer preventing part and a control part, the communicating part comprises an input pipe, the input pipe is located at the front end of a valve body, and a sliding part is arranged in the input pipe and provided with a water conveying channel; a rotating vane is further connected into the input pipe and can block one end of the water conveying channel; when water in the communicating part has impact force on the sliding part, the sliding part slides in the direction away from the rotating vane, the sliding part can drive the rotating vane to rotate, and the flow passing through the water conveying channel is increased. In the water supply source switching process, water flow dispersion impact strength is disturbed through rotation of the rotating vanes; meanwhile, a buffer pipe is opened, and part of high-pressure backflow water instantly flows into the buffer pipe to be absorbed; after the rotating vane is completely reset, a blocking surface is formed to intercept follow-up backflow and avoid repeated impact of water flow; the normal water delivery efficiency is guaranteed, the energy of the positive water hammer can be weakened in the whole process, and the impact damage risk of the positive water hammer to pipelines and valves is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of valves, and in particular to a water source water hammer control device. Background Technology

[0002] Currently, some hydropower stations use a water supply system that primarily relies on gravity flow and secondarily on circulating water tanks. During the water supply process, switching between these two sources is necessary. However, the process of shutting down valves during this switching can easily lead to positive water hammer. Flowing water has inertia; when its velocity changes abruptly, the inertial force is converted into instantaneous pressure, forming a pressure wave that propagates back and forth within the pipeline – this is water hammer, commonly known as "water shock." It produces a sound similar to a hammer striking a pipe and can damage pipes, valves, and other equipment. It often occurs during rapid valve opening and closing, sudden pump start-up and shutdown, and pipeline interruptions during water source switching. Short-term high pressure can exceed the pipeline's pressure-bearing limit, leading to pipe rupture, valve damage, and even affecting the water supply system's sealing system. Repeated pressure fluctuations accelerate pipeline fatigue and aging, reducing equipment lifespan. Therefore, it is necessary to eliminate the impact of water hammer on pipelines during water source switching. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to reduce the negative impact of water hammer effect on pipelines.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a water source cutting waterproof hammer device, comprising, The connecting part includes an input pipe located at the front end of the valve body, and a sliding part is provided inside the input pipe, the sliding part having a water conveying channel; The input pipe is also connected to a vane, which can block one end of the water conveyance channel. When the water in the connecting part has an impact force on the sliding part, the sliding part slides away from the rotating blade. The movement of the sliding part can drive the rotating blade to rotate, thereby increasing the flow rate through the water conveying channel.

[0005] In a preferred embodiment of the water source cutting and waterproof hammer device of the present invention: there are multiple sets of rotating blades along the radial direction of the input pipe, and the multiple sets of rotating blades form a blocking surface, which is located at the front end of the water conveyance channel.

[0006] In a preferred embodiment of the water source cutting waterproof hammer device of the present invention: a connecting member is provided between the rotating blade and the sliding part, and when the sliding part moves, the rotating blade is driven to rotate through the connecting member.

[0007] In a preferred embodiment of the water source cutting and waterproof hammer device of the present invention: a buffer pipe is connected to the top of the input pipe.

[0008] In a preferred embodiment of the water source cutting and waterproof hammer device of the present invention: the buffer pipe is further provided with an opening and closing part, and when the sliding part moves, the opening and closing of the buffer pipe can be controlled by the opening and closing part.

[0009] In a preferred embodiment of the water source cutting and waterproof hammer device of the present invention: the opening and closing part includes a fixed retaining ring fixedly disposed on the inner wall of the buffer pipe, a baffle disposed in the buffer pipe, a long rod fixedly connected to the bottom of the baffle, and the long rod being inserted into the sliding part.

[0010] In a preferred embodiment of the water source cutting waterproof hammer device of the present invention: a guide part is further provided on the inner wall of the sliding part, and a fixed ball that abuts against the guide part is connected to the bottom end of the long rod; The sliding part is also provided with an oblique groove that penetrates the guide part, and the long rod is inserted into the sliding part through the oblique groove.

[0011] In a preferred embodiment of the water source cutting waterproof hammer device of the present invention: the guide part includes protrusions at both ends, and a recess is provided between the protrusions at both ends of the guide part; When the fixed ball corresponds to the protrusion, the buffer tube is closed; The buffer tube opens when the fixed ball aligns with the recessed part.

[0012] In a preferred embodiment of the water source cutting and waterproof hammer device of the present invention: the end of the sliding part is connected to a limiting member, and the input pipe is also provided with a reset member connected to the limiting member.

[0013] In a preferred embodiment of the water source switching and waterproof hammer device of the present invention: the output end of the valve body is connected to an output pipe, the top end of the input pipe is connected to a short pipe, and the top end of the short pipe is connected to the top end of the buffer pipe through an inclined pipe.

[0014] The beneficial effects of this invention are as follows: During the water supply switching process, when the water valve closes and causes water backflow, it pushes the sliding part to move, and the rotating blade interferes with the direction of the backflow water, dispersing the initial impact intensity; at the same time, the opening and closing part opens with the sliding part, allowing some of the high-pressure backflow water to flow into the buffer pipe for absorption instantly, and the dual effect quickly reduces the pressure peak; after the rotating blade is fully reset, it forms a blocking surface to intercept subsequent backflow and avoid repeated water impact; it not only ensures normal water delivery efficiency, but also weakens the positive water hammer energy throughout the process, avoids single impact and repeated oscillation, and greatly reduces the risk of positive water hammer impact damage to pipelines and valves. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the structure of the present invention is shown; Figure 2 A schematic diagram of the sliding part in this invention is shown; Figure 3 A schematic diagram of the opening and closing part in this invention is shown; Figure 4 A schematic diagram of the guide portion in this invention is shown; Figure 5 A schematic diagram of the connector in this invention is shown. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0018] Reference Figures 1-5 This embodiment provides a water source-based waterproof hammer cutting device, including, The connecting part 1 includes an input pipe 11, which is located at the front end of the valve body M. The input pipe 11 is provided with a sliding part 2, which has a water conveying channel. The inlet pipe 11 is also connected to a vane 3, which can block one end of the water conveyance channel; When the water in the connecting part 1 has an impact force on the sliding part 2, the sliding part 2 slides away from the rotating blade 3. The movement of the sliding part 2 can drive the rotating blade 3 to rotate, thereby increasing the flow rate through the water conveying channel. The inlet pipe 11 is fixed to the inlet end of the valve via a flange. The sliding part 2 is slidably connected inside the inlet pipe 11. The sliding part 2 is a ring-shaped component 231, with a water conveyance channel through its central structure. When the sliding part 2 is in the initial position, the vane 3 blocks the water conveyance channel. When the valve body M is opened, water enters the valve through the inlet pipe 11 and flows into the rear pipeline. As the water flows in the inlet pipe 11, it is affected by the vane 3, which exerts an impact force on the sliding part 2, causing the sliding part 2 to move in the first direction (the first direction is...). Figure 2(In the direction indicated by the middle arrow) After the sliding part 2 is subjected to the impact force, it drives the rotating blade 3 to rotate, so that the water conveying channel is fully opened and the water flow rate entering the water conveying channel increases. At the moment the valve body M is closed, the water is instantly cut off, generating a reverse impact force. This impact force is applied to the sliding part 2, pushing the sliding part 2 towards the rotating blade 3 in the second direction. After the sliding part 2 is pushed, it drives the rotating blade 3 to rotate and reset. The rotating blade 3 blocks one side of the water conveying channel, so that the backflowing water finally impacts the rotating blade 3 and is blocked by the rotating blade 3. At the same time, the water flow is disturbed by the rotating blade 3, thereby achieving the effect of reducing the impact force of the backflowing water, preventing the water flow from continuously impacting the pipeline after the positive water hammer effect occurs, and reducing the negative impact of the positive water hammer effect on the pipeline.

[0019] Furthermore, there are multiple sets of rotating blades 3 along the radial direction of the input pipe 11, and these multiple sets of rotating blades 3 form a blocking surface, which is located at the front end of the water conveying channel. The cross-section of the multiple sets of rotating blades 3 is a fan-shaped structure. A connecting shaft 32 is provided in the middle of the rotating blades 3. One end of the multiple sets of rotating blades 3 is rotatably connected to the inner wall of the input pipe 11 through the connecting shaft 32. The multiple sets of rotating blades 3 are evenly distributed around the axis of the input pipe 11, and the spacing between the multiple sets of rotating blades 3 is small, so that the multiple sets of rotating blades 3 can form a circular blocking surface. The diameter of the blocking surface is larger than the diameter of the water conveying channel. Since the blocking surface is located at the front end of the water conveying channel, when the sliding part 2 is in the initial position, the multiple sets of rotating blades 3 are laid flat and blocking the front end of the water conveying channel. When water enters the input pipe 11, it is first blocked by the rotating blades 3. Due to the blocking of the rotating blades 3, the water flow can impact the sliding part 2 more quickly and move in the first direction. After the sliding part 2 moves, it drives the rotating blades 3 to rotate around the connecting shaft 32, thereby making the water conveying channel fully open. At this time, the water flow can flow smoothly to the valve body M.

[0020] Furthermore, a connecting member 31 is provided between the rotating blade 3 and the sliding part 2. When the sliding part 2 moves, the rotating blade 3 is driven to rotate through the connecting member 31. The connector 31 includes multiple sets of fixed seats 311 fixedly disposed on one side of the rotating blade 3 and the sliding part 2. Each set of rotating blades 3 has a fixed seat 311 fixedly disposed on one side of the back side. Each set of fixed seats 311 is rotatably connected to a rotating seat 312. A set of connecting rods 313 is rotatably connected between the rotating seat 312 on one set of rotating blades 3 and the rotating seat 312 on one set of sliding part 2. When the sliding part 2 is in the initial position, the connecting rod 313 is in a folded state. Since the rotating blade 3 is rotatably connected to the inner wall of the input pipe 11 through the connecting shaft 32, the rotating blade 3 can only rotate around the connecting shaft 32. When the sliding part 2 moves in the first direction, the connecting rod 313 rotates and simultaneously drives one side of the rotating blade 3 to rotate around the connecting shaft 32, so that the surface of the rotating blade 3 can approach parallel to the direction of water flow. The water delivery channel is fully opened, and the water flow rate that can enter the water delivery channel increases. At the instant the water valve is closed, the instant the blocked water backflow pushes the sliding part 2 to move in the second direction. The movement of the sliding part 2 drives the rotating blade 3 to rotate and reset through the connecting rod 313. During this process, the angle of the rotating blade 3 can interfere with the flow direction of the backflow, thereby reducing the impact force of the backflow and reducing the impact force of the water flow on the pipeline during the positive water hammer effect. When the rotating blade 3 is fully reset, it forms a blocking surface. The subsequent backflow water impacts the rotating blade 3, further preventing the water from repeatedly impacting the pipeline due to the positive water hammer effect.

[0021] In the initial state, the vane 3 cooperates with the sliding part 2 in the folded state through the connecting rod 313, and the water conveying channel is fully opened, which can reduce the water flow resistance and allow the water in the input pipe 11 to pass through the water conveying channel smoothly. This avoids the vane 3 blocking the water flow under non-water hammer conditions, ensures the stability of the main pipeline water supply flow, does not cause additional energy loss, and adapts to normal water conveying needs. At the moment the water valve is closed, the water flow is suddenly blocked and backflow occurs. The impact force of the backflow water directly pushes the sliding part 2 to move in the second direction. The sliding part 2 drives the rotating blade 3 to rotate and reset through the connecting rod 313. During this process, the angle of the rotating blade 3 changes continuously, constantly interfering with the flow direction of the backflow water. The originally concentrated backflow impact force is dispersed, the water flow speed gradually slows down, and the instantaneous pressure peak of the positive water hammer is greatly reduced, avoiding the direct impact of high-pressure water flow on the pipes and valves. After the rotor blade 3 is fully reset, it forms a rigid blocking surface. Subsequent backflow water that has not been diverted will directly impact the rotor blade 3. The rotor blade 3 absorbs the remaining impact energy through its own structure, preventing the water flow from reflecting and oscillating back and forth in the pipeline. This avoids secondary and multiple impacts caused by positive water hammer from the source, and further protects weak parts such as pipeline welds and valve seals.

[0022] As an optional embodiment, the end of the sliding part 2 is connected to a limiting member 23, and the input pipe 11 is also provided with a reset member 5 connected to the limiting member 23; the reset member 5 includes a cylinder 51 fixedly disposed on the inner wall of the input pipe 11, and a spring 52 is provided between the outer wall of the cylinder 51 and the inner wall of the input pipe 11; the limiting member 23 includes a ring 231 fixedly slidably disposed in the cylinder 51, one end of the ring 231 is fixedly connected to a plurality of connecting plates 232, the other end of the connecting plate 232 is connected to one end of the sliding part 2, and the two ends of the spring 52 respectively abut against the ends of the ring 231 and the cylinder 51; When the sliding part 2 slides in the first direction, the ring 231 is driven to move and compress the spring 52 to contract. When the valve is closed, the water flow no longer applies force to the sliding part 2. The spring 52 pushes the sliding part 2 to reset, which in turn drives the vane 3 to rotate and reset. This allows the sliding part 2 to automatically move and reset at the moment the valve is closed, so that when the water flows back and impacts due to the positive water hammer effect, the vane 3 can be in a rotating and reset state.

[0023] As an optional embodiment, the top of the input pipe 11 is connected to a buffer pipe 12, which is located at the rear end of the rotor blade 3. By setting the buffer pipe 12, the water flowing back due to the positive water hammer effect can be guided into the buffer pipe 12 when it impacts the blocking surface formed by the rotor blade 3.

[0024] Furthermore, the buffer tube 12 is also provided with an opening and closing part 4. When the sliding part 2 moves, the opening and closing of the buffer tube 12 can be controlled by the opening and closing part 4. In the initial state and after the sliding part 2 has completely slid, the opening and closing part 4 closes the buffer pipe 12, preventing water in the input pipe 11 from flowing into the buffer pipe 12. During the movement of the sliding part 2, the opening and closing part 4 can be opened, allowing the water flowing back due to the positive water hammer effect to instantly enter the buffer pipe 12 when the sliding part 2 resets. This allows the high-pressure water flow to surge into the buffer pipe 12 instantly. The buffer pipe 12 absorbs the kinetic energy of the water flow by storing the water flow, which is equivalent to providing a "pressure relief channel" for the impact water flow. This prevents the high-pressure backflow from directly impacting weak parts such as valves and interfaces in the input pipe 11, and prevents problems such as pipe weld cracking and valve damage caused by the positive water hammer effect.

[0025] Furthermore, the opening and closing part 4 includes a fixed retaining ring 41 fixedly disposed on the inner wall of the buffer tube 12, a baffle 42 disposed in the buffer tube 12, and a long rod 43 fixedly connected to the bottom of the baffle 42, the long rod 43 being inserted into the sliding part 2. The inner wall of the fixed retaining ring 41 has a slope, and the periphery of the baffle 42 also has a slope. When the sliding part 2 is in the initial state, it restricts the position of the baffle 42 by the long rod 43, so that the periphery of the baffle 42 fits against the inner side of the fixed baffle 42, thereby achieving the effect of blocking the buffer tube 12. During the movement of the sliding part 2, the sliding part 2 can unlock the restriction on the long rod 43, and the baffle 42 can detach from the fixed retaining ring 41 due to its own buoyancy, thereby opening the buffer tube 12.

[0026] Furthermore, a guide part 21 is provided on the inner wall of the sliding part 2, and a fixed ball 44 that abuts against the guide part 21 is connected to the bottom end of the long rod 43; an oblique groove 22 that penetrates the guide part 21 is also provided on the sliding part 2, and the long rod 43 is inserted into the sliding part 2 through the oblique groove 22. The guide part 21 is fixedly disposed on the inner wall of the sliding part 2, and the fixed ball 44 is fixedly connected to the bottom of the long rod 43. The surface of the fixed ball 44 abuts against the inner wall of the guide part 21. Since the long rod 43 is inserted into the inclined groove 22 and the position of the long rod 43 is restricted, it can only slide up and down. When the sliding part 2 slides along the axial direction of the input pipe 11, it is guided by the inclined groove 2222 and rotates, so that different positions of the guide part 21 correspond to the fixed ball 44, thereby achieving the effect of controlling the opening and closing of the buffer pipe 12.

[0027] In this embodiment, the rotating seat 312 has a boss on its outer side, and the fixed seat 311 has a groove in its inner wall. The correspondence between the boss and the groove allows the rotating seat 312 to rotate in the fixed seat 311 without disengaging from the fixed seat 311. This ensures that the connecting rod 313 can be driven normally when the sliding part 2 rotates, without causing the connecting rod 313 to jam.

[0028] Furthermore, the guide portion 21 includes protrusions 211 at both ends, and a recess 212 is provided between the protrusions 211 at both ends of the guide portion 21. When the fixed ball 44 corresponds to the protrusion 211, the buffer tube 12 is closed; When the fixed ball 44 corresponds to the recessed part 212, the buffer tube 12 is opened.

[0029] The surface of the guide part 21 is generally arc-shaped. The protrusions 211 at both ends of the guide part 21 are close to the axis of the input pipe 11. The position of the two sets of protrusions 211 is the recess 212. The recess 212 is located away from the axis of the input pipe 11. When the fixed ball 44 contacts the protrusion 211, the protrusion 211 abuts against the fixed ball 44, and then drives the baffle 42 to abut against the surface of the fixed retaining ring 41 through the long rod 43, thus closing the buffer pipe 12 and preventing water in the input pipe 11 from flowing into the buffer pipe 12. When the fixed ball 44 corresponds to the recess 212, the guide part 21 no longer restricts the position of the fixed ball 44. The baffle 42 moves upward due to its own buoyancy, thus opening the buffer pipe 12. When the sliding part 2 is in the initial state, the fixed ball 44 abuts against the protrusion 211, so that the buffer tube 12 is in the closed state. During the sliding part 2 sliding in the first direction, due to the setting of the inclined groove 22, the sliding part 2 rotates, which drives the guide part 21 to rotate. The recess 212 is rotated to correspond with the fixed ball 44. At this time, the baffle 42 floats up and the buffer tube 12 is opened. However, since the baffle 42 floats up slowly and the fixed ball 44 corresponds with the recess 212 for a short time, only a small amount of water enters the buffer tube 12 from the input pipe 11. The sliding part 2 continues to move in the first direction so that the protrusion 211 corresponds with the fixed ball 44 again. At this time, the buffer tube 12 is closed and the input pipe 11 is in the normal conveying state. At the moment the valve is closed, part of the backflowing water is dispersed by the turbulence of the rotating blade 3, and the other part impacts and enters the buffer tube 12 during the reset process of the sliding part 2.

[0030] In the initial state, the opening and closing part 4 closes the buffer pipe 12, the rotating blade 3 is close to the direction of water flow, and the water delivery channel is fully opened; the two work together to avoid the water flow to the buffer pipe 12 under non-water hammer conditions, and also reduce the resistance of the rotating blade 3 to the water flow, ensuring stable water supply flow in the main pipeline and minimal energy loss. During the water supply switching process, when the water valve closes and causes water backflow, it pushes the sliding part 2 to move, and the rotating blade 3 rotates to interfere with the direction of the backflow water and disperse the initial impact intensity. At the same time, the opening and closing part 4 moves with the sliding part 2 and opens, allowing some of the high-pressure backflow water to flow into the buffer pipe 12 for absorption. The dual effect quickly reduces the pressure peak. After the rotating blade 3 is fully reset, it forms a blocking surface to intercept subsequent backflow and avoid repeated water impact. This ensures normal water delivery efficiency and weakens the positive water hammer energy throughout the process, avoiding single impacts and repeated oscillations, and significantly reducing the risk of positive water hammer impact damage to pipelines and valves.

[0031] As an optional embodiment, the output end of the valve body M is connected to the output pipe 13, the top end of the input pipe 11 is connected to the short pipe 14, and the top end of the short pipe 14 is connected to the top end of the buffer pipe 12 through the inclined pipe 15. In this embodiment, the output end of the valve body M is fixedly connected to the output pipe 13 via a flange. The other end of the output pipe 13 is connected to a water supply pipe. The height of the short pipe 14 is less than the height of the buffer pipe 12. A one-way valve is provided in the short pipe 14, so that water can only enter the output pipe 13 through the short pipe 14. The water in the output pipe 13 cannot enter the short pipe 14. When the water flowing back due to the positive water hammer effect rushes into the buffer pipe 12, the high-speed flowing water can rush from the buffer pipe 12 into the inclined pipe 15 and finally into the short pipe 14, and then into the output pipe 13 through the short pipe 14, thereby avoiding water accumulation in the buffer pipe 12 and waste.

[0032] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A water source cutting and waterproof hammer device, characterized in that: include, The connecting part (1) includes an input pipe (11) located at the front end of the valve body (M), and a sliding part (2) is provided inside the input pipe (11), the sliding part (2) having a water conveying channel; The input pipe (11) is also connected to a rotating blade (3), which can block one end of the water conveyance channel; When the water in the connecting part (1) has an impact force on the sliding part (2), the sliding part (2) slides away from the rotating blade (3). The movement of the sliding part (2) can drive the rotating blade (3) to rotate, thereby increasing the flow rate through the water conveying channel.

2. The water source cutting and waterproof hammer device according to claim 1, characterized in that: The rotating blades (3) are arranged in multiple sets along the radial direction of the input pipe (11), and the multiple sets of rotating blades (3) form a blocking surface, which is located at the front end of the water conveying channel.

3. The water source cutting and waterproof hammer device according to claim 2, characterized in that: A connecting member (31) is provided between the rotating blade (3) and the sliding part (2). When the sliding part (2) moves, the rotating blade (3) is driven to rotate through the connecting member (31).

4. The water source cutting and waterproof hammer device according to claim 3, characterized in that: The top of the input tube (11) is connected to a buffer tube (12).

5. The water source cutting and waterproof hammer device according to claim 4, characterized in that: The buffer tube (12) is also provided with an opening and closing part (4). When the sliding part (2) moves, the opening and closing of the buffer tube (12) can be controlled by the opening and closing part (4).

6. The water source cutting and waterproof hammer device according to claim 5, characterized in that: The opening and closing part (4) includes a fixed retaining ring (41) fixedly disposed on the inner wall of the buffer tube (12), a baffle (42) disposed in the buffer tube (12), and a long rod (43) fixedly connected to the bottom of the baffle (42). The long rod (43) is inserted into the sliding part (2).

7. The water source cutting and waterproof hammer device according to claim 6, characterized in that: The inner wall of the sliding part (2) is also provided with a guide part (21), and the bottom end of the long rod (43) is connected to a fixed ball (44) that abuts against the guide part (21). The sliding part (2) is also provided with an oblique groove (22) that penetrates the guide part (21), and the long rod (43) is inserted into the sliding part (2) through the oblique groove (22).

8. The water source cutting and waterproof hammer device according to claim 7, characterized in that: The guide portion (21) includes protrusions (211) at both ends, and a recess (212) is provided between the protrusions (211) at both ends of the guide portion (21). When the fixed ball (44) corresponds to the protrusion (211), the buffer tube (12) is closed; When the fixed ball (44) corresponds to the recess (212), the buffer tube (12) is opened.

9. The water source cutting and waterproof hammer device according to claim 4 or 8, characterized in that: The end of the sliding part (2) is connected to a limiting member (23), and the input pipe (11) is also provided with a reset member (5) connected to the limiting member (23).

10. The water source cutting and waterproof hammer device according to claim 9, characterized in that: The output end of the valve body (M) is connected to an output pipe (13), and the top end of the input pipe (11) is connected to a short pipe (14). The top end of the short pipe (14) is connected to the top end of the buffer pipe (12) through an inclined pipe (15).

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