Device for reducing water hammer effect in vertical direction

Abstract

In order to reduce the water hammer effect in a liquid transmission pipeline, particularly the water hammer effect in the vertical direction generated in a long pipeline in the vertical direction, the utility model provides a device for reducing the water hammer effect in the vertical direction, which comprises a mounting seat 2 and a transmission pipe 3, one end of the mounting seat 2 is connected with an outlet of a transmission pump 1, the transmission pipe 3 is fixed on the mounting seat 2, and the other end of the transmission pump 1 is connected with the transmission pump 1. The transmission pipe 3 is a channel for transmitting liquid, the wave absorption part comprises an installation base bottom plate 5 and a wave absorption pipe 7, the installation base bottom plate 5 is located on the lower portion of the installation base 2, an opening 6 is formed in the middle of the installation base bottom plate 5, the space above the opening is communicated with the transmission pipe 3, and the space below the opening is communicated with the wave absorption pipe 7. According to the air compressible principle, the water hammer effect in the pipeline is absorbed and reduced, and the safety of the pipeline, the valve and the hydraulic pump is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid pipelines, and particularly to a device for reducing water hammer effect in the vertical direction. Background Art

[0002] In a liquid transmission pipeline, when a pipeline valve is quickly closed or a working hydraulic pump suddenly stops, a liquid flow shock wave will be generated in the pipeline. Repeatedly acting, the resulting effect is very much like a hammer hitting the pipe wall, which is the "water hammer effect" in hydraulics. In a system where the transmission pipe is set vertically, the pipeline is relatively long, and the transmission end is at a higher position, such as the main transmission pipeline of a fire protection system. When the hydraulic pump stops, the water hammer effect generated in the main pipeline is superimposed with the potential energy of the high-position water. At this time, the water hammer effect in the vertical downward direction is more prominent and more destructive, and it is very likely to damage pipelines, valves, and hydraulic pump impellers in the system. Summary of the Invention

[0003] The utility model provides a device for reducing water hammer effect in the vertical direction, which includes a mounting seat 2. One end of the mounting seat 2 is connected to the outlet of a transmission pump 1. It further includes a transmission pipe 3, and the transmission pipe 3 is fixed on the mounting seat 2 and is a channel for transmitting liquid. It is characterized in that it further includes a wave absorption part. The wave absorption part includes a mounting seat bottom plate 5 and a wave absorption pipe 7. The mounting seat bottom plate 5 is located below the mounting seat 2. There is an opening 6 in the middle of the mounting seat bottom plate 5. The space above the opening is communicated with the transmission pipe 3, and the space below the opening is communicated with the wave absorption pipe 7.

[0004] Based on the principle that air is compressible, when the hydraulic pump suddenly stops and the water hammer effect in the downward direction occurs, the liquid flow in the transmission pipe quickly enters the wave absorption pipe through the opening in the middle of the mounting seat bottom plate. The liquid level in the wave absorption pipe rises, compressing the air at the upper end of the wave absorption pipe. Due to the compressible characteristic of air, the instantaneous high pressure transmitted is absorbed and reduced. When the water hammer effect changes direction and propagates upward, the liquid in the wave absorption pipe flows back to the transmission pipe through the opening in the bottom plate, and the pressure in the wave absorption pipe is released. When the second downward shock wave arrives, the liquid in the transmission pipe flows into the wave absorption pipe through the opening in the bottom plate again, thereby reducing the water hammer effect in the downward direction. This process repeats, gradually weakening until the water hammer effect completely disappears. The utility model reduces the water hammer effect in the vertical direction transmission pipe through the wave absorption pipe, effectively protecting valves, hydraulic pump impellers, etc. in the pipeline system. Description of the Drawings

[0005] Figure 1 Structure diagram of the device for reducing water hammer effect in the vertical direction; Figure 2 Structure diagram of Embodiment 2

[0006] 1. Hydraulic pump 2. Mounting seat 3. Transmission pipe 4. Bolt 5. Mounting seat bottom plate 6. Opening 7. Wave absorption pipe 8. Transmission pipe cavity 9. Transmission pipe outer wall 10. Mounting seat through hole Detailed implementation method

[0007] A vertical water hammer effect reduction device includes a mounting seat. One end of the mounting seat is connected to the outlet of the hydraulic pump. The mounting seat provides an installation foundation for the transmission pipe. The transmission pipe is installed above the mounting seat and is a channel for transmitting liquid. It also includes a wave absorption part. The wave absorption part includes a mounting seat bottom plate and a wave absorption pipe. The mounting seat bottom plate is located at the lower part of the mounting seat. There is an opening in the middle of the mounting seat bottom plate. The diameter of the opening is very small. The space above the opening is connected to the transmission pipe, and the space below the opening is connected to the wave absorption pipe. The wave absorption pipe is a vertically arranged thin pipe, and its height is lower than half of the transmission pipe. The top of the wave absorption pipe is a sealed structure. During operation, the hydraulic pump transports the liquid into the cavity of the mounting seat. Because the opening in the mounting seat bottom plate is very small, the liquid flow is blocked when passing through the opening. Therefore, the main liquid flow enters the transmission pipe and is transported upward along the transmission pipe. The liquid that leaks through the opening in the mounting seat bottom plate and accumulates slowly at the bottom. When the liquid level is higher than the inlet of the wave absorption pipe, the air in the wave absorption pipe is sealed in the upper part of the wave absorption pipe. As the hydraulic pump continuously pressurizes, the liquid flowing into the wave absorption pipe from the opening in the mounting seat bottom plate gradually increases, and the pressure gradually increases until the pressure in the wave absorption pipe is the same as the pressure in the transmission pipe. At this time, no more liquid enters the wave absorption pipe from the mounting seat opening, and all the liquid flows towards the outlet direction of the transmission pipe, and the system works normally. When the hydraulic pump stops and a vertical downward water hammer effect is generated in the transmission pipe, the liquid wave peak is vertically downward. The liquid flow passes through the opening in the middle of the mounting seat bottom plate, and the pressure is transmitted to the liquid in the wave absorption pipe, thereby compressing the air at the top of the wave absorption pipe and making room for the newly incoming liquid. Through this transmission path, the vertical downward water hammer effect is weakened. When the water hammer effect changes direction and propagates upward, the air compressed at the top of the wave absorption pipe is released under pressure, and the water level in the wave absorption pipe drops. When the second downward shock wave arrives, the air at the top of the wave absorption pipe is compressed again, thereby reducing the water hammer effect again. This process repeats until the water hammer effect disappears. The utility model utilizes the principle of air compressibility and hydraulic balance in the connected pipeline, and adopts the small hole in the mounting seat bottom plate and the slender wave absorption pipe to balance the liquid pressure in the transmission pipe and eliminate the vertical water hammer effect.

[0008] Embodiment 2

[0009] The difference from the first embodiment is that a through-hole is provided at the bottom of the mounting base, and the through-hole of the mounting base communicates with the cavity of the transmission pipe. The transmission pipe has an inner and outer layer structure with a cavity in the middle. The height of the outer wall of the transmission pipe is lower than the total height of the transmission pipe, which is one-third of the overall height of the transmission pipe in this example. The top of the outer wall of the transmission pipe is firmly welded to the transmission pipe. During operation, a part of the liquid in the pipeline flows into the through-hole of the mounting base, and a liquid level of a certain height is gradually formed in the cavity of the transmission pipe. There is enclosed air above the liquid level. As the hydraulic pump continuously pressurizes, the liquid entering the through-hole of the mounting base gradually increases, and the pressure in the cavity gradually increases until it is the same as the pressure in the transmission pipe. At this time, no more liquid enters the through-hole of the mounting base, and the system works normally. When a water hammer effect vertically downward occurs in the transmission pipe, the liquid flow squeezes the liquid in the cavity of the transmission pipe through the through-hole of the mounting base, compressing the upper air to absorb and reduce the water hammer effect.

[0010] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, with changes in shape or changes in the movement mode or replacement, should be covered within the protection scope of the present utility model.

Claims

1. A device for reducing the water hammer effect in a vertical direction, comprising a mounting seat (2), one end of which is connected to an outlet of a transmission pump (1), and a transmission pipe (3), which is fixed on the mounting seat (2) and is a channel for transmitting liquid, characterized in that: It also includes a wave absorbing portion, which includes a mounting base bottom plate (5) and a wave absorbing tube (7), wherein the mounting base bottom plate (5) is located at the lower part of the mounting base (2), and an opening (6) is provided in the middle of the mounting base bottom plate (5), wherein the space above the opening is connected to the transmission tube (3), and the space below the opening is connected to the wave absorbing tube (7).

2. The water hammer effect reduction device according to claim 1, characterized in that: The wave absorbing tube (7) is arranged vertically.

3. The water hammer effect reduction device according to claim 2, characterized in that: The wave absorbing tube (7) is in the shape of a thin tube.

4. The water hammer effect reduction device according to claim 2, characterized in that: The top of the wave absorbing tube (7) is a closed structure.

5. The water hammer effect reduction device according to claim 1, characterized in that: The wave absorbing part comprises a mounting seat through hole (10), a transmission pipe cavity (8) and a transmission pipe outer wall (9), and the mounting seat through hole (10) is in communication with the transmission pipe cavity (8).

6. The water hammer effect reduction device according to claim 5, characterized in that: The transmission pipe outer wall (9) surrounds the outer layer of the transmission pipe, and the top of the transmission pipe outer wall is welded and fixed to the outside of the transmission pipe (3).

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