Drainage system and drainage method

Abstract

The present invention provides a drainage system and drainage method, comprising: a drainage device, connected to a pool via an inlet pipe, and connected to a sewage well via an outlet pipe, wherein one end of the inlet pipe is located at the bottom of the pool, along the inner side of the pool wall to the top of the pool and down along the outer side of the pool wall to the other end; and a water storage tank, located at the top of the inlet pipe, the water storage tank is filled with water through a fifth valve at the bottom of the water storage tank. The present invention can effectively reduce the cost and construction difficulty of the drainage system, improve the flexibility and stability of the drainage method, and has economic benefits in the research and application of drainage systems for microbial degradation and water treatment structures.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and in particular to a drainage system and a drainage method. Background Art

[0002] Water treatment structures are facilities or structures used to treat and purify water, usually including sedimentation tanks, biological tanks and filtration tanks. Sedimentation tanks use gravity to settle suspended solids, biological tanks use microorganisms to degrade organic pollutants, and filtration tanks use different types of filter media to remove particulate matter and suspended matter.

[0003] For the drainage system of water treatment structures, the current drainage valve and drainage pipe are usually set at the lowest point and connected to the sewage well to drain water by gravity.

[0004] However, this method has the following problems: high cost and difficult construction. When the structure is deeper, the depth of the drainage pipe and sewage well also increases accordingly, resulting in a significant increase in civil engineering costs and pipeline operation and maintenance difficulties. Secondly, the drainage method is unstable. Even if the buried depth of the sewage well meets the requirements, the liquid level in the sewage pipe is often too high due to various factors in actual operation, resulting in the inability of the water treatment structure to drain water by gravity, and a temporary sewage pump must be set up for drainage.

[0005] In summary, a drainage system is needed that can solve the problems of the current drainage system, such as high cost, difficult construction, and unstable drainage methods. Summary of the invention

[0006] The present invention aims to provide a drainage system and a drainage method, which can utilize the siphon principle and an automatic control program to achieve pool drainage, thereby solving the problems of high cost, difficult construction and unstable drainage methods of the current drainage system.

[0007] According to one aspect of the present invention, there is provided a drainage system, comprising: a drainage device, connected to a water pool via a water inlet pipe, and connected to a sewage well via a water outlet pipe, wherein one end of the water inlet pipe is located at the bottom of the water pool, and extends along the inner side of the pool wall to the top of the pool and down along the outer side of the pool wall to the other end; and a water storage tank, located at the top of the water inlet pipe, which fills the water inlet pipe with water via a fifth valve at the bottom of the water storage tank.

[0008] Preferably, a drainage pump and a valve system are provided in the drainage device. When the difference in liquid level between the inside and outside of the pool does not satisfy siphon discharge, the valve is switched and the drainage pump is used to discharge the remaining liquid.

[0009] Preferably, a one-way valve is provided at one end of the water inlet pipeline, and the height is adjusted as the drainage device moves relative to the pool.

[0010] Preferably, the water storage tank also stores water via a first valve at the top thereof, or is evacuated via the first valve.

[0011] Preferably, the quantitative relationship between the liquid level height H5 of the sewage well and the liquid level height H1 of the water pool is: H1>H5+h1+h2+h3, wherein h1 is the head loss of the water inlet pipe, h2 is the head loss of the drainage device, h3 is the head loss of the water outlet pipe, and H5>H4, wherein H4 is the drainage height of the sewage well.

[0012] Preferably, the quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level height H1 of the water pool is: H8-H1>He-Hp, where He is the atmospheric pressure at the drainage system, Hp is the saturated vapor pressure, and PSH>NPSHr, where NPSH is the pre-designed cavitation margin, and NPSHr is the cavitation margin allowed by the water pump in the drainage system.

[0013] According to another aspect of the present invention, there is provided a drainage method, comprising: opening a first valve at the top of a water storage tank and a fifth valve at the bottom to fill a water inlet pipe with water so that the water level of the water storage tank reaches a predetermined height of a liquid level gauge; wherein one end of the water inlet pipe is located at the bottom of a pool, and a drainage device is provided along the inner side of the pool wall to the top of the pool and along the outer side of the pool wall to the other end; while the pool realizes siphon drainage by utilizing the liquid level difference through the water inlet pipe, a second valve located at the drainage device is opened to drain water to a sewage well through the outlet pipe.

[0014] Preferably, a one-way valve disposed at one end of the water inlet pipeline adjusts its height following the movement of the drainage device relative to the pool.

[0015] Preferably, the water storage tank also stores water via a first valve at the top thereof or draws a vacuum via the first valve.

[0016] Preferably, the quantitative relationship between the liquid level H5 of the sewage well and the liquid level H1 of the water pool is: H1>H5+h1+h2+h3, where h1 is the head loss of the water inlet pipeline, h2 is the head loss of the drainage device, h3 is the head loss of the water outlet pipeline, and H5>H4, where H4 is the drainage height of the sewage well. The quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level H1 of the water pool is: H8-H1>He-Hp, where He is the atmospheric pressure where the drainage system is located, Hp is the saturated vapor pressure, and NPSH>NPSHr, where NPSH is the pre-designed NPSH margin, and NPSHr is the NPSH margin allowed by the water pump in the drainage system.

[0017] The present invention provides a drainage system and drainage method, and sets a water storage tank, pipelines, valves, water storage tanks, instruments and power distribution systems, so as to realize the drainage of the pool body by using the siphon principle and matching automatic control programs. Each pipeline does not need to set through-wall pipes and valves at the bottom of the pool body, and the inspection and installation of the pipeline system have no effect on the operation of the structure; the system is modularly designed and can be freely combined, fixedly installed, or mobile installed; the entire system can be set above the ground, reducing the civil construction cost and operation and maintenance difficulty of the sewage well. The present invention can effectively reduce the cost and construction difficulty of the drainage system, improve the stability of the drainage method, and has economic benefits in the research and application of drainage systems for microbial degradation and water treatment structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of a mobile drainage system according to an embodiment of the present invention;

[0020] Figure 2 It is an operation logic diagram of a mobile drainage system according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a fixed drainage system according to an embodiment of the present invention;

[0022] Figure 4 It is an operation logic diagram of a fixed drainage system according to an embodiment of the present invention; and

[0023] Figure 5 Schematic diagram of a sampling system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0026] This application realizes the drainage of the pool body by setting up water storage tanks, pipelines, valves, water storage tanks, instruments and power distribution systems, using the siphon principle and supporting automatic control programs. Each pipeline does not need to be equipped with through-wall pipes and valves at the bottom of the pool body, and the inspection and installation of the pipeline system have no effect on the operation of the structure; the system is modularly designed and can be freely combined, fixedly installed, or mobile installed; the entire system can be set above the ground, reducing the civil construction cost and operation and maintenance difficulty of the sewage well. The present invention can effectively reduce the cost and construction difficulty of the drainage system and improve the stability of the drainage method.

[0027] An embodiment of the present invention provides a drainage system, comprising: a drainage device, connected to a water pool via a water inlet pipe, and connected to a sewage well via a water outlet pipe, wherein one end of the water inlet pipe is located at the bottom of the water pool, goes up along the inner side of the pool wall to the top of the pool and goes down along the outer side of the pool wall to the other end; and a water storage tank, located at the top of the water inlet pipe, which fills the water inlet pipe with water via a fifth valve at the bottom of the water storage tank.

[0028] In the related art, when the water treatment structure is deep, the drainage pipe will be very deep, resulting in a deep sewage well, which greatly increases the civil engineering costs and the difficulty of pipeline operation and maintenance. In the embodiment of the present invention, with the help of the water storage tank on the top of the water inlet pipeline, the drainage device can not only use the liquid level difference to achieve siphon drainage, but also directly pressure it to any structure, reducing the pipeline system and saving energy consumption. At the same time, the drainage system can be set above the ground to reduce the civil engineering costs and operation and maintenance difficulty of the sewage well.

[0029] According to an embodiment of the present invention, a drainage pump and a valve system are provided in the drainage device. When the difference in liquid level between the inside and outside of the pool does not satisfy siphon discharge, the drainage pump is used to discharge the remaining liquid by switching the valve.

[0030] In the related art, traditional drainage systems often rely on temporarily adding drainage pumps to solve the problem when the liquid level difference is insufficient. However, this method not only increases the complexity of operation, but may also lead to low drainage efficiency and system instability, especially when the liquid level changes frequently. Manual operation of valves and drainage pumps is prone to operational errors and equipment wear. In the embodiment of the present invention, by arranging a drainage pump and a valve system in the drainage device, when the internal and external liquid level difference of the pool is not enough to achieve siphon discharge, the drainage pump can be started to drain the remaining liquid through the automatic valve switching. This design effectively solves the drainage problem when the liquid level difference is insufficient, simplifies the operation process, improves the drainage efficiency and system stability, reduces the error rate of manual operation and equipment wear, and thus significantly improves the reliability and operation efficiency of the drainage system.

[0031] According to an embodiment of the present invention, a one-way valve is provided at one end of the water inlet pipeline, and the height is adjusted following the movement of the drainage device relative to the pool.

[0032] In the related art, the pipelines of the drainage system are usually fixed, and the height cannot be adjusted according to actual needs. It lacks flexibility and is therefore difficult to adapt to drainage needs at different depths and locations. In the embodiment of the present invention, a one-way valve is provided at one end of the water inlet pipeline, and the height is adjusted following the movement of the drainage device relative to the pool, thereby achieving flexible adjustment of the drainage pipeline. This design allows the position of the water inlet pipeline to be flexibly adjusted under different pool capacities and heights, thereby ensuring the efficient operation of the drainage system under various working conditions, improving drainage efficiency, and reducing the difficulty of system operation and maintenance.

[0033] According to an embodiment of the present invention, the water storage tank also stores water via a first valve at the top thereof, or is vacuumed via the first valve.

[0034] In the related art, the traditional system cannot flexibly respond, especially when it is necessary to adjust the water storage or vacuum operation. In the embodiment of the present invention, by setting a first valve on the top of the water storage tank, water storage or vacuum operation can be flexibly selected, further improving the operational convenience and drainage efficiency of the system.

[0035] According to an embodiment of the present invention, the quantitative relationship between the liquid level height H5 of the sewage well and the liquid level height H1 of the water pool is: H1>H5+h1+h2+h3, wherein h1 is the head loss of the water inlet pipe, h2 is the head loss of the drainage device, h3 is the head loss of the water outlet pipe, and H5>H4, wherein H4 is the drainage height of the sewage well.

[0036] In the embodiment of the present invention, by setting the liquid level height relationship between the sewage well and the water pool in detail, the liquid level difference of the drainage system is ensured to be moderate, thereby achieving efficient drainage. Specifically, by designing the formulas H1>H5+h1+h2+h3 and H5>H4, it is ensured that the drainage system can operate under ideal liquid level difference conditions, avoiding the problems of poor drainage and system instability caused by the liquid level difference, and improving the drainage efficiency and system reliability.

[0037] According to an embodiment of the present invention, the quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level height H1 of the water pool is: H8-H1>He-Hp, where He is the atmospheric pressure at the location of the drainage system, Hp is the saturated vapor pressure, and PSH>NPSHr, where NPSH is the pre-designed cavitation margin, and NPSHr is the cavitation margin allowed by the water pump in the drainage system.

[0038] In the related art, the drainage system often lacks accuracy in liquid level control and NPSH calculation, which easily causes cavitation and damages the water pump. In the embodiment of the present invention, by setting a specific quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level height H1 of the water pool, and combining the factors of atmospheric pressure He and saturated vapor pressure Hp, the liquid level difference is ensured to be moderate, and at the same time, the cavitation phenomenon is avoided by the design of NPSH and NPSHr.

[0039] According to another embodiment of the present invention, a drainage method is provided, comprising: opening a first valve at the top of a water storage tank and a fifth valve at the bottom to fill a water inlet pipe with water so that the water level of the water storage tank reaches a predetermined height of a liquid level gauge; wherein one end of the water inlet pipe is located at the bottom of a pool, and a drainage device is provided along the inner side of the pool wall to the top of the pool and along the outer side of the pool wall to the other end; while the pool realizes siphon drainage by utilizing the liquid level difference through the water inlet pipe, a second valve located at the drainage device is opened to drain water to a sewage well through the outlet pipe.

[0040] In the related art, when the water treatment structure is deep, the drainage pipe will be very deep, resulting in a deep sewage well, which greatly increases the civil engineering cost and the difficulty of pipeline operation and maintenance. In the embodiment of the present invention, the siphon principle can be used to match the automatic control program to achieve pool drainage, thereby solving the problems of high cost, difficult construction and unstable drainage mode of the current drainage system.

[0041] According to an embodiment of the present invention, a one-way valve disposed at one end of the water inlet pipeline adjusts its height following the movement of the drainage device relative to the pool.

[0042] In the related art, the height of the water inlet pipe of the drainage system is usually fixed and cannot be flexibly adjusted according to the drainage demand. In particular, when the liquid level of the pool changes greatly, it is easy to cause poor drainage or frequent manual intervention and adjustment. In the embodiment of the present invention, by setting a one-way valve at one end of the water inlet pipe and enabling it to adjust its height following the movement of the drainage device relative to the pool, the dynamic adjustment capability of the water inlet pipe is realized, ensuring efficient drainage when the liquid level of the pool changes, reducing manual intervention, and improving the adaptability and automation level of the drainage system.

[0043] According to an embodiment of the present invention, the water storage tank also stores water via a first valve at the top thereof or draws a vacuum via the first valve.

[0044] In the embodiment of the present invention, by setting a first valve on the top of the water storage tank, the water storage tank can be used for both water storage and vacuum extraction, thereby realizing flexible switching of operations. This design simplifies the operation process of the system, improves the adaptability and operation efficiency of the drainage system under different working conditions, and thus ensures the efficient operation of the system.

[0045] According to an embodiment of the present invention, the quantitative relationship between the liquid level H5 of the sewage well and the liquid level H1 of the water pool is: H1>H5+h1+h2+h3, where h1 is the head loss of the water inlet pipeline, h2 is the head loss of the drainage device, h3 is the head loss of the water outlet pipeline, and H5>H4, where H4 is the drainage height of the sewage well. The quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level H1 of the water pool is: H8-H1>He-Hp, where He is the atmospheric pressure at the location of the drainage system, Hp is the saturated vapor pressure, and NPSH>NPSHr, where NPSH is the pre-designed NPSH margin, and NPSHr is the NPSH margin allowed by the water pump in the drainage system.

[0046] In the related art, the liquid level height control of the drainage system usually lacks precise design and calculation, which results in the inability to effectively control the liquid level difference during the drainage process, unstable system operation, low drainage efficiency, and easily causes the liquid level to be too high or too low. In the embodiment of the present invention, by setting a specific quantitative relationship between the liquid level height H5 of the sewage well and the liquid level height H1 of the water pool, as well as a specific quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level height H1 of the water pool, it is ensured that the system operates under ideal liquid level difference conditions. This design not only effectively improves the drainage efficiency and system stability, avoids poor drainage due to improper liquid level control, but also reduces maintenance difficulty and operating costs, and significantly improves the reliability and economic benefits of the system.

[0047] The following is a detailed description of the implementation scheme of this application with reference to the accompanying drawings:

[0048] Figure 1 , Figure 2 The schematic diagram and operation logic diagram of the mobile drainage system are shown. Taking a mobile drainage system set up in a single tank as an example, the liquid level in the tank is set to H1, the liquid level in the sewage well is set to H5, the starting height of the inlet pipe is H2, the terminal height of the outlet pipe is H4, the center height of the drainage pump is H3, and the highest point of the pipeline is H8; the head loss of the inlet pipe is h1, the head loss of the drainage device is h2, the head loss of the outlet pipe is h3, the design NPSH, the allowable NPSH of the pump is NPSHr, the local atmospheric pressure is He, and the saturated steam pressure is Hp.

[0049] Prerequisite: H8-H1>He-Hp and NPSH>NPSHr

[0050] About half of the pool height is above the ground, which means that the liquid level difference can be used to drain part of the pool by siphoning and gravity.

[0051] H1>H5+h1+h2+h3 and H5>H4

[0052] When the above requirements cannot be met, it is necessary to switch the valve to use a water pump for drainage. At this time, the requirement is: H3>H2+He-Hp-NPSH-h1

[0053] For the schematic diagram of the fixed drainage system and the specific operation logic, see Figure 3 , Figure 4 Taking a biological pond and a secondary sedimentation tank sharing a fixed drainage system as an example, through valve switching and instrument monitoring system, automatic operation can be judged according to the operation status analysis. Both ponds can discharge part of the tank capacity through siphon gravity, and part of the tank capacity is sent to the fine screen through pressure pump, reducing the energy consumption of the total water intake pump in the plant.

[0054] Prerequisites: H8-H1>He-Hp, H9-H6>He-Hp and NPSH>NPSHr

[0055] Sampling system diagram Figure 5 Three water inlet pipes at different heights are set in one water pool, sharing one set of siphon drainage device, which can realize sampling at three heights or half-pool emptying. There is no need to set up additional power, and there is no need to worry about damage and maintenance of sampling pipes or valves, which will affect the operation of the structure.

[0056] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the invention. For those skilled in the art, other different forms of changes or modifications can be made based on the following invention, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A drainage method applied to a drainage system, characterized in that: The drainage system comprises the following parts: A drainage device connected to the pool via an inlet pipe and connected to the sewage well via an outlet pipe, wherein one end of the inlet pipe is located at the bottom of the pool, along the inner side of the pool wall to the top of the pool and down along the outer side of the pool wall to the other end; and A water storage tank is located at the top of the water inlet pipeline, and the water storage tank fills the water inlet pipeline with water through a fifth valve at the bottom of the water storage tank; A drainage pump and a valve system are arranged in the drainage device. When the difference in the liquid level inside and outside the pool does not meet the requirement of siphon discharge, the remaining liquid is discharged by switching the valve and using the drainage pump. A one-way valve is provided at one end of the water inlet pipeline, and the height is adjusted following the movement of the drainage device relative to the pool; in, The quantitative relationship between the liquid level H5 of the sewage well and the liquid level H1 of the water pool is: H1>H5+h1+h2+h3, where h1 is the head loss of the water inlet pipe, h2 is the head loss of the drainage device, h3 is the head loss of the water outlet pipe, and, H5>H4, where H4 is the drainage height of the sewage well; The quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level H1 of the water pool is: H8-H1>He-Hp, where He is the atmospheric pressure at the location of the drainage system, Hp is the saturated vapor pressure, and, NPSH>NPSHr, where NPSH is the pre-designed NPSH margin and NPSHr is the NPSH margin allowed for the water pump in the drainage system; The drainage method comprises: Open the first valve at the top of the water storage tank and the fifth valve at the bottom to fill the water inlet pipeline, so that the water level of the water storage tank reaches the predetermined height of the liquid level gauge; wherein one end of the water inlet pipeline is located at the bottom of the pool, and it goes up along the inner side of the pool wall to the top of the pool and down along the outer side of the pool wall to the drainage device at the other end; When the pool realizes siphon drainage by utilizing the liquid level difference through the water inlet pipeline, the second valve located in the drainage device is opened to drain the water to the sewage well through the water outlet pipeline.

2. The drainage method according to claim 1, characterized in that: The water storage tank can also store water via a first valve at the top thereof, or can be vacuumed via the first valve.

3. The drainage method according to any one of claims 1 to 2, characterized in that: The quantitative relationship between the liquid level H5 of the sewage well and the liquid level H1 of the water pool is: H1>H5+h1+h2+h3, where h1 is the head loss of the water inlet pipe, h2 is the head loss of the drainage device, h3 is the head loss of the water outlet pipe, and, H5>H4, wherein H4 is the drainage height of the sewage well.

4. The drainage method according to claim 3, characterized in that: The quantitative relationship between the top height H8 of the water inlet pipeline and the liquid level H1 of the water pool is: H8-H1>He-Hp, where He is the atmospheric pressure at the location of the drainage system, Hp is the saturated vapor pressure, and, NPSH>NPSHr, wherein NPSH is the pre-designed NPSH margin, and NPSHr is the allowable NPSH margin of the water pump in the drainage system.

5. The drainage method according to claim 1, characterized in that: The one-way valve arranged at one end of the water inlet pipeline adjusts its height following the movement of the drainage device relative to the pool.

6. The drainage method according to claim 1, characterized in that: The water storage tank can also store water via a first valve at the top thereof or be vacuumed via the first valve.

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