Intelligent water hammer elimination tank system and use method

Abstract

The present invention provides an intelligent water hammer elimination tank system and a method of using the same, which belongs to the field of pipeline transportation equipment, and includes a body and an air bag arranged in the body, the outlet of the air bag is connected to the medium transmission pipeline and an impedance component is arranged between the two; a liquid level sensor for collecting liquid in the body is arranged on the side of the body; a pressure sensor is arranged on the upper end of the body to collect the pressure of the gas in the body; an air filling nozzle for air replenishment is also arranged on the upper end of the body, and a leak detection sensor is arranged at the bottom of the body; the liquid level sensor, the pressure sensor, the air replenishment valve actuator and the leak detection sensor are all electrically connected to the control center through a control circuit. The present invention can monitor the working pressure, liquid level height, water leakage, air leakage, actuator status, etc. of the water hammer elimination tank in real time, has the functions of early warning and protection, automatically performs real-time accurate air replenishment, and can check the theoretical parameters of the water hammer elimination tank to optimize the use effect.

Description

Technical Field

[0001] The invention belongs to the field of pipeline transportation equipment, relates to water hammer prevention equipment, and in particular to an intelligent water hammer elimination tank system and a use method thereof. Background Art

[0002] The water hammer eliminator is an effective active water hammer protection device. When the pipeline pressure drops due to pump stop or other reasons, the liner-type water hammer eliminator prevents the generation of negative pressure by replenishing water to the pipeline, thereby solving the water hammer caused by pump stop and flow interruption from the source; when positive pressure returns from the downstream of the pipeline, the gas in the tank is compressed, thereby smoothing the positive pressure peak. It can completely replace the traditional two-way pressure regulating tower.

[0003] The liner type water hammer elimination tank is affectionately called the "water hammer guard". The liner type water hammer elimination tank is divided into vertical and horizontal types. The structural principles of the two are the same. After the liner type water hammer elimination tank is installed, compressed gas (nitrogen or dry air) of a certain pressure (according to the results of hydraulic transition calculation) is filled into the tank, the liner is squeezed, and the volume of water in the liner is zero. During normal water flow, since the water pressure is greater than the pressure of the pre-charged gas, water enters the liner, the gas is compressed, the pressure increases, and the volume decreases. There is part water and part compressed nitrogen in the liner type water hammer elimination tank. The water and compressed nitrogen are separated by the liner. No matter what the reason for the pressure drop in the pipeline, the water in the liner type water hammer elimination tank enters the pipeline under the squeeze of compressed nitrogen to prevent the generation of negative pressure, thereby preventing the generation of pump stop water hammer and pipeline flow break-off water hammer.

[0004] Traditional vertical and horizontal water hammer eliminator tanks do not have intelligent control functions. They are manually controlled and equipped with conventional liquid level gauges, pressure gauges and leak detectors. The monitoring values ​​on each instrument are checked on site. The protection function of the water hammer eliminator tank for the water system depends on rigorous hydraulic calculations, such as initial inflation pressure, steady-state gas pressure and volume, steady-state inner tank water storage volume, peak state, etc. Traditional water hammer eliminator tanks do not have intelligent parameter status detection and protection, which are crucial to the normal operation, protection function and inspection of the use effect of the water hammer eliminator tank. Summary of the invention

[0005] The problem to be solved by the present invention is to provide an intelligent water hammer elimination tank system and a method of use, which can monitor the working pressure, liquid level, water leakage, air leakage, actuator status, etc. of the water hammer elimination tank in real time, have the functions of early warning and protection, and play a role in real-time monitoring, reliable control and protection of the normal operation of the water hammer elimination tank, automatically perform real-time and accurate air replenishment, and can check the theoretical parameters of the water hammer elimination tank to optimize the use effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an intelligent water hammer elimination tank system, comprising a body and an air bag arranged in the body, wherein the outlet of the air bag is connected to the medium transmission pipeline and an impedance component is arranged between the two;

[0007] A liquid level sensor for collecting liquid in the body is provided on the side of the body; a pressure sensor is provided on the upper end of the body for collecting the pressure of the gas in the body; an air filling nozzle is also provided on the upper end of the body, and the air filling nozzle is connected to the air source device through an air supply pipe, and an air supply valve actuator is provided on the air supply pipe, and a leak detection sensor is provided at the bottom of the body;

[0008] The liquid level sensor, pressure sensor, air supply valve actuator and leak detection sensor are all electrically connected to the control center through a control line.

[0009] Furthermore, the control center includes a control cabinet and a human-machine interface touch screen. The control cabinet is controlled by a PLC program and can be installed in a pump room or on the main body. The human-machine interface touch screen can display data in real time and realize human-machine interaction.

[0010] Furthermore, the liquid level sensor is a magnetic flap level gauge, which directly reflects the high liquid level and feeds back to the control center. The pressure sensor includes a pressure transmitter and a shock-resistant pressure gauge. The pressure transmitter is used to monitor the pressure in the body, and the shock-resistant pressure gauge is used to measure the gas pressure in the body. The body is also provided with a safety valve and a maintenance valve. The safety valve is used to release the gas pressure in the body, and a stop valve is provided between the inflation nozzle and the body.

[0011] Furthermore, the impedance component includes an impedance main pipe and an impedance branch pipe, one end of the impedance main pipe is connected to the outlet of the water hammer elimination tank, and the other end is connected to the medium transmission pipeline. The impedance main pipe is provided with a first manual valve, a second check valve and a second manual valve in sequence from the end of the medium transmission pipeline to the water hammer elimination tank. The second check valve is opened when the water hammer elimination tank replenishes water to the medium transmission pipeline, and is closed otherwise; the two ends of the impedance branch are connected to the two ends of the second check valve, and a manual ball valve connected in parallel with the second check valve is provided on the impedance branch; a water pump and a first check valve are provided on the medium transmission pipeline, and the impedance main pipe is provided at one end of the first check valve away from the water pump and close to the side where the medium flows.

[0012] Furthermore, the first manual valve and the second manual valve are both manual eccentric hemispherical valves, the first check valve is an axial flow check valve, the medium forms a water column in the medium transmission pipeline, and after the water pump stops, when the inertia of the water column is exhausted, that is, when the forward flow rate is reduced to 0, the first check valve is closed, and the first manual valve and the second manual valve are both in a normally open state. When replenishing water, the manual ball valve and the second check valve are opened.

[0013] Furthermore, the water hammer elimination tank is an inner liner type water hammer elimination tank, and the main body of the water hammer elimination tank is a vertical or horizontal structure.

[0014] Furthermore, the main body is a vertical structure, the upper end of the main body is provided with a threaded upper flange, the lower end is provided with a threaded lower flange, the main body is a hollow tank structure, an airbag is arranged inside the main body, the upper flange presses and fixes the upper end of the airbag, and the lower flange presses and fixes the lower end of the airbag; a protective tube is provided on the upper end face of the lower flange, and the protective tube extends upward into the main body, a gap for installing the airbag is reserved between the positioning protective tube and the inner wall of the main body, and through holes are provided on the protective tube, and the sum of the areas of the through holes is equal to the total area of ​​the inlet and outlet water pipes.

[0015] Furthermore, the upper end surface of the protective tube is spherical, and the through hole includes a top hole and a side hole. The top hole is arranged on the upper spherical surface of the protective tube, and the side hole is arranged on the side of the protective tube. The medium is connected to the medium flow pipeline through the side hole. The diameter of the top hole is smaller than the diameter of the side hole. The diameter of the top hole is 8-12mm. The top holes are evenly distributed on the protective tube. From the top view of the protective tube, three adjacent top holes on different straight lines form an equilateral triangle structure.

[0016] Furthermore, the top of the protective tube is arranged higher than the smallest end of the inner wall of the main body, the distances between the two sides of the protective tube and the inner wall of the main body are consistent, a guide ring is provided below the upper flange, the lower end surface of the guide ring is arranged lower than the upper end of the inner wall of the main body, a circulation hole is provided on the guide ring, a maintenance ladder is provided on the side of the main body, the maintenance ladder is connected to the main body by a reinforcing rod, a support is provided at the lower end of the main body, and the support is fixedly connected to the ground by anchor screws.

[0017] The method for using the intelligent water hammer elimination tank system includes the following steps:

[0018] S1. Install the body and the airbag, fix the body on the ground, unfold the airbag, roll it up and put it into the body, then fix the airbag to the body, and connect the outlet of the airbag to the medium transmission;

[0019] S2. Install and test the parts. The control center is electrically connected to the liquid level sensor, pressure sensor, air supply valve actuator and leak detection sensor to control them and display the data on the human-machine interface touch screen in real time. Perform an overall sealing test and the test is qualified if there is no water leakage.

[0020] S3, real-time monitoring during operation and determination of whether to perform air replenishment. Based on the determination result, whether to perform air replenishment is performed. Assume that the pressure of the pre-charged compressed gas is P1, the volume of the water hammer elimination tank is V1, the gas pressure during operation is P2, and the volume of the compressed gas during operation is V2;

[0021] V1 is the known initialization parameter input, and P1 and P2 are acquired by the pressure sensor;

[0022] According to the law of isothermal change of gas: P1×V1=P2×V2, the volume of compressed gas during operation V2=P1V1 / P2. At the same time, the volume of water in the airbag V3=V1-V2 is calculated;

[0023] According to the relationship between the tank volume and the water level (as shown below), calculate the water level H during operation;

[0024]

[0025] R is the inner radius of the body;

[0026] The calculated height H is compared with the actual liquid level h collected by the liquid level sensor, and an early warning or control instruction is automatically issued. When the actual height h collected and the calculated height H exceed the normal deviation, the intake valve is automatically controlled to replenish air.

[0027] Compared with the prior art, the present invention has the following advantages and positive effects.

[0028] 1. The present invention is provided with multiple sensors, which can monitor the working pressure, liquid level, water leakage, air leakage, actuator status, etc. of the water hammer elimination tank in real time, have the functions of early warning and protection, and play a role in real-time monitoring, reliable control and protection of the normal operation of the water hammer elimination tank, automatically perform real-time accurate air replenishment, and can test the theoretical parameters of the water hammer elimination tank to optimize the use effect;

[0029] 2. The present invention is provided with an impedance main circuit and an impedance branch circuit. When replenishing water, the impedance main circuit and the impedance branch circuit are opened at the same time, but the second check valve on the impedance main circuit can only replenish water, which effectively prevents water backflow and ensures that the impedance of replenishing water from the water hammer elimination tank to the medium transmission pipeline must be much smaller than the impedance of filling water from the pipeline to the inner tank type water hammer elimination tank, which effectively prevents water hammer and prolongs the service life of the water pump and the water hammer elimination tank;

[0030] 3. The first check valve of the present invention adopts an axial flow check valve. The medium forms a water column in the medium transmission pipeline. After the water pump stops, when the inertia of the water column is exhausted, that is, when the forward flow rate is reduced to 0, the first check valve is closed, effectively preventing the water column from flowing backward and impacting the water pump;

[0031] 4. In the first embodiment, the main body of the three-dimensional structure is simple in structure, automatically operates, is safe and reliable, the medium is stored in the rubber liner, does not contact the tank body, and will not corrode the tank body; the liner is made of rubber, which will not pollute the medium; the gas is stored between the liner and the tank body, will not leak, and does not need to be frequently inflated; it can prevent pump stop water hammer and bridging water hammer;

[0032] 5. The present invention provides a protective tube and a protective tube to ensure the normal flow of the medium and effectively limit the airbag. When the pressure of the airbag liner system is low, it effectively prevents the airbag from entering the pipeline and being stuck and damaged, thereby extending the service life of the airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding 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 accompanying drawings:

[0034] Figure 1 It is a schematic diagram of the structure of the intelligent water hammer elimination tank system of the present invention;

[0035] Figure 2 is a schematic diagram of the structure of the impedance component of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the utility body as an embodiment of a vertical structure;

[0037] Figure 4 The present invention Figure 3 Detailed drawing of Part A;

[0038] Figure 5 The present invention Figure 3 Detail of Part B;

[0039] Figure 6 is a top view of the protective tube of the present invention;

[0040] Figure 7 It is the layout diagram of the three top holes of the utility model;

[0041] Figure 8 It is a linear proportional diagram of pressure and liquid level height of the present invention.

[0042] Reference numerals:

[0043] 1. Impedance main pipe; 11. First manual valve; 12. Second check valve; 13. Second manual valve; 2. Impedance branch pipe; 21. Manual ball valve; 3. Medium transmission pipeline; 4. First check valve; 5. Water pump; 6. Water hammer elimination tank; 61. Main body; 62. Support; 621. Anchor screw; 63. Maintenance ladder; 64. Guardrail; 65. Protective tube; 66. Lower flange; 662. Top hole; 663. Side hole; 67. Upper flange; 671. Pipe seat; 672. Guide ring; 673. Flow hole; 7. Air bag; 8. Magnetic flap level gauge; 20. Pressure changer; 30. Seismic pressure; 40. Inspection valve; 50. Safety valve; 60. Air supply nozzle; 70. Stop valve; 80. Air supply valve actuator; 90. Air source device; 100. Control center; 200. Human-machine interface touch screen. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0047] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 to Figure 7As shown, the present invention is an intelligent water hammer elimination tank system, including a liquid level sensor for collecting liquid in the body 61 provided on the side of the body 61; a pressure sensor is provided at the upper end of the body 61 for collecting the pressure of the gas in the body 61; an air filling nozzle is also provided at the upper end of the body 61, and the air filling nozzle is connected to the air source device 90 through an air filling pipe, and an air filling valve actuator 80 is provided on the air filling pipe, and a leak detection sensor is provided at the bottom of the body 61;

[0049] The liquid level sensor, the pressure sensor, the air supply valve actuator 80 and the leak detection sensor are all electrically connected to the control center 100 through a control line.

[0050] Preferably, the control center 100 includes a control cabinet and a human-machine interface touch screen 200. The control cabinet is PLC program controlled and can be installed in the pump room or on the main body 61. The human-machine interface touch screen 200 can display data in real time and realize human-machine interaction. The human-machine interface displays the status including the normal working graphic interface, working pressure, liquid level height, water leakage, air leakage, actuator status, parameter settings and personnel control operations.

[0051] Preferably, the liquid level sensor is a magnetic flap level gauge 8, which intuitively reflects the liquid level height and feeds back to the control center 100. The pressure sensor includes a pressure transmitter and a shock-resistant pressure gauge 30. The pressure transmitter is used to monitor the pressure inside the main body 61, and the shock-resistant pressure gauge 30 is used to measure the gas pressure inside the main body 61. The main body 61 is also provided with a safety valve 50 and a check valve 40. The safety valve 50 is used for the internal and external pressures of the main body 61, and a stop valve 70 is provided between the inflation nozzle and the main body 61.

[0052] like Figure 2 As shown, the impedance assembly includes an impedance main pipe 1 and an impedance branch pipe 2. One end of the impedance main pipe 1 is connected to the outlet of the water hammer elimination tank 6, and the other end is connected to the medium transmission pipeline 3. The impedance main pipe is provided with a first manual valve 11, a second check valve 12 and a second manual valve 13 in sequence from the end of the medium transmission pipeline 3 to the water hammer elimination tank 6. The second check valve 12 is opened when the water hammer elimination tank 6 replenishes water to the medium transmission pipeline 3, and is closed otherwise.

[0053] The two ends of the impedance branch are connected to the two ends of the second check valve 12, and a manual ball valve 21 connected in parallel with the second check valve 12 is provided on the impedance branch;

[0054] A water pump 5 and a first check valve 4 are provided on the medium transmission pipeline 3, and the impedance main pipe 1 is provided at one end of the first check valve 4 away from the water pump 5 and close to the side where the medium flows.

[0055] Preferably, the first manual valve 11 and the second manual valve 13 are both manual eccentric hemispherical valves, which have a simple structure, high stability and low cost, and both are in an open state to ensure the circulation of the medium.

[0056] Preferably, the first check valve 4 is an axial flow check valve, which has sensitive structure and its special circular structure makes it very simple to install in long-distance pipelines or the outlet of air compressors, and can be installed horizontally or vertically. Its stroke is also shorter due to its circular disc structure and it only has one sealing surface, so it is very convenient to manufacture.

[0057] Preferably, the medium forms a water column in the medium transmission pipeline 3. After the water pump 5 stops pumping, when the inertia of the water column is exhausted, that is, when the forward flow velocity is reduced to 0, the first check valve 4 is closed, effectively preventing the water column from flowing backwards and impacting the water pump 5.

[0058] Preferably, the water hammer elimination tank 6 is an inner liner type water hammer elimination tank 6, which has a longer service life and a more stable effect of eliminating water hammer compared to ordinary water hammer elimination tanks 6. The water hammer elimination tank 6 is a vertical or horizontal structure, and the structure in this application can be adopted.

[0059] Preferably, the first manual valve 11 and the second manual valve 13 are both in a normally open state to ensure that the medium can be replenished from the water hammer elimination tank 6 more quickly and smoothly. When replenishing water, the manual ball valve 21 and the second check valve 12 are opened to ensure the flow of the medium, and the second check valve 12 can only discharge water, effectively preventing water backflow.

[0060] In the actual working process, in order to give full play to the negative pressure elimination ability of the inner liner type water hammer elimination tank 6 on the medium transmission pipeline 3, the steady-state pressure in the inner liner type water hammer elimination tank 6 must be completely replenished in the direction of the end of the medium transmission pipeline 3, that is, the transmission direction of the water flow, and water cannot be replenished in the direction of the water pump 5 to hit the first check valve 4. The inner liner type water hammer elimination tank 6 and the medium transmission pipeline 3 are a communicating vessel. Therefore, as long as the pressure of the medium transmission pipeline 3 is reduced, the inner liner type water hammer elimination tank 6 will replenish water to the medium transmission pipeline 3. In order to give full play to the negative pressure elimination ability of the inner liner type water hammer elimination tank 6, the steady-state pressure in the inner liner type water hammer elimination tank 6 is completely replenished in the direction of the end of the medium transmission pipeline 3, and water cannot be replenished in the direction of the water pump 5 to hit the first check valve 4. This application ensures that water can only flow in the direction of the end section of the medium transmission pipeline 3, but cannot flow in the direction of the water pump 5, thereby extending the service life of the water pump 5.

[0061] The first check valve 4 at the outlet of the water pump 5 automatically tracks the moment when the inertia of the water column is exhausted, that is, the moment when the forward flow velocity is reduced to 0, and automatically closes the valve disc, that is, the axial flow check valve. After the pump is stopped, the water in the pipeline continues to flow toward the end of the medium transmission pipeline 3 due to inertia, but the flow velocity begins to decrease, and the pressure in the medium transmission pipeline 3 also decreases. The water in the liner type water hammer elimination tank 6 is replenished into the medium transmission pipeline 3 and flows to the end of the medium transmission pipeline 3 together with the water in the medium transmission pipeline 3. When the inertia of the water column is exhausted, that is, the forward flow velocity is reduced to 0, the axial flow check valve is closed, and the water column in the medium transmission pipeline 3 cannot flow back to the water pump 5. Therefore, the steady-state pressure in the liner type water hammer elimination tank 6 is completely replenished in the direction of the end of the medium transmission pipeline 3, and does not replenish water in the direction of the water pump 5 and taps the first check valve 4;

[0062] The impedance of the inner liner water hammer elimination tank 6 replenishing water to the medium transmission pipeline 3 must be much smaller than the impedance of the pipeline filling water to the inner liner water hammer elimination tank 6, that is, the flow rate of the inner liner water hammer elimination tank 6 replenishing water to the medium transmission pipeline 3 is large, and the flow rate of the pipeline filling water to the inner liner water hammer elimination tank 6 is small. That is, the diameter of the pipe used by the inner liner water hammer elimination tank 6 to replenish water to the medium transmission pipeline 3 is large, and the diameter of the pipe used by the pipeline to fill water to the inner liner water hammer elimination tank 6 is small. The present application always adopts a mother-and-child type check valve, and the first manual valve 11 and the second manual valve 13 are both in a normally open state. The second check valve 12 is opened when the inner liner water hammer elimination tank 6 replenishes water to the medium transmission pipeline 3, and is closed otherwise. When the inner liner water hammer elimination tank 6 replenishes water to the medium transmission pipeline 3, water can be replenished to the medium transmission pipeline 3 through the manual ball valve 21 and the second check valve 12 together. Therefore, the flow area is large, the impedance is small, and the flow rate is large; when the pipeline fills water to the inner liner water hammer elimination tank 6, the check valve is closed, and water can only enter through the manual ball valve 21. Therefore, the flow area is small, the impedance is large, and the flow rate is small.

[0063] After the liner type water hammer eliminator is installed, compressed gas (nitrogen or dry air) of a certain pressure (according to the result of hydraulic transition calculation) is filled into the tank, the liner is squeezed, and the volume of water in the liner is zero. During normal water flow, since the water pressure is greater than the pressure of the pre-charged gas, water enters the liner, the gas is compressed, the pressure increases, and the volume decreases. There is part water and part compressed nitrogen in the liner type water hammer eliminator, and the water and compressed nitrogen are separated by the liner. No matter for what reason the pressure in the pipeline drops, the water in the liner type water hammer eliminator enters the pipeline under the squeeze of compressed nitrogen to prevent the generation of negative pressure, thereby preventing the generation of water hammer due to pump stop and water hammer due to pipeline flow interruption.

[0064] like Figure 3-Figure 7As shown, the present invention is an energy storage type pressure regulating tank structure, including a body, an upper flange 67 with threaded connection is provided at the upper end of the body, and a lower flange 66 with threaded connection is provided at the lower end. The body is a cavity tank structure, and an air bag 7 is arranged inside the body. The upper flange 67 is pressed and fixed to the upper end of the air bag 7, and the lower flange 66 is pressed and fixed to the lower end of the air bag 7.

[0065] A protective tube 65 is provided on the upper end surface of the lower flange 66. The protective tube 65 extends upward into the body. A gap for installing the airbag 7 is reserved between the protective tube 65 and the inner wall of the body. Through holes are provided on the protective tube 65. The sum of the areas of the through holes is equal to the total area of ​​the inlet and outlet pipes.

[0066] The main body is made of Q345R material, the airbag 7 is made of rubber airbag 7, and the rubber liner has good wear resistance, which can meet the contact and friction between the liner and the tank wall when the energy storage pressure regulating tank works normally for a long time.

[0067] The main body is provided with an air injection hole, an observation hole, a pressure gauge, a pressure sensor, and a liquid level sensor, which can monitor gas leakage, water leakage and pressure leakage online in real time. During normal operation, the ratio of gas to water remains basically unchanged. If a gas leakage problem occurs, the liquid level in the energy storage type pressure regulating tank will rise, and the liquid level sensor will sense and issue an alarm. A photoelectric liquid level switch is installed at the lower part of the energy storage type pressure regulating tank. Under normal circumstances, it will not issue an alarm when in contact with the gas. If a water leakage problem occurs, the photoelectric liquid level switch will be connected and issue an alarm signal; if a pressure leakage problem occurs, the pressure sensor will transmit the pressure information to the PLC control cabinet, and the control cabinet will make a judgment and alarm. The sealing of the connection parts of this structure should be able to be monitored and processed online (if there is a problem with the sealing of the equipment connection parts, the gas will leak, the liquid level in this structure will rise, and the liquid level sensor will sense and issue an alarm. The inner and outer surfaces of the main body are finely processed and anti-corrosion sprayed. Permanent anti-corrosion protection measures are adopted in the main body. Except for the seals, all non-processing areas are sprayed with epoxy resin coatings, and the coating thickness meets the wear and corrosion requirements of 30 years of service life.

[0068] Preferably, a protective tube 65 is provided in the middle of the upper end of the lower end surface, and the upper end surface of the protective tube 65 is spherical to position and protect the airbag 7; more preferably, the through hole includes a top hole 662 and a side hole 663, the top hole 662 is provided on the upper spherical surface of the protective tube 65, and the side hole 663 is provided on the side of the protective tube 65, and the medium is connected to the medium flow pipeline through the side hole 663 and the top hole 662.

[0069] Preferably, the diameter of the top hole 662 is smaller than the diameter of the side hole 663 , and the diameter of the top hole 662 is 8-12 mm. In the present application, the diameter of the top hole 662 is 10 mm, and the diameter of the side hole 663 is 12 mm.

[0070] Preferably, the top holes 662 are evenly distributed on the protective tube 65. From the top view of the protective tube 65, three adjacent top holes 662 on different straight lines form an equilateral triangle structure, which ensures the balance of medium flow and avoids excessive local water flow, which causes unstable impact on the airbag 7. This mechanism further improves the positioning stability of the airbag 7 during use and extends the service life of the airbag 7.

[0071] Preferably, the top end of the protective tube 65 is arranged higher than the smallest end of the inner wall of the body, and the distances between the two sides of the protective tube 65 and the inner wall of the body are consistent, which not only reserves installation space for the airbag 7, but also plays a role of limiting and guiding.

[0072] Preferably, a tube seat 671 is provided on the upper flange 67, one end of the tube seat 671 is connected to the interior of the airbag 7, and the other end is connected to an external monitoring device. A guide ring 672 is provided below the upper flange 67, and the lower end surface of the guide ring 672 is set lower than the upper end of the inner wall of the main body 61. A flow hole 673 is provided on the guide ring 672. The setting of the guide ring 672 guides and limits the upper end of the airbag 7, which has the same function as the protective tube 65.

[0073] Preferably, a maintenance ladder 63 is provided on the side of the main body 61, and the maintenance ladder 63 is connected to the main body by a reinforcing rod, which has high strength and is convenient for subsequent maintenance and upkeep. A support 62 is provided at the lower end of the main body, and the support 62 is fixedly connected to the ground by anchor screws 621, which makes installation more convenient, more stable and reliable.

[0074] Preferably, a guardrail 64 is provided at the upper end of the main body, and a side flange connected to the magnetic flap level gauge 8 is provided on the side. The side flange is arranged on the upper part of the main body, and the lower end of the lower flange 66 is connected to the lower end of the magnetic flap level gauge 8. The magnetic flap level gauge 8 monitors the water level in the tank and the pressure sensor monitors the water pressure. This structure is installed next to the mother pipe of the water supply pipeline, and the equipment does not require daily repair and maintenance. This structure is provided with an air safety valve, that is, a safety pressure relief device. When water hammer pressure overpressure may occur under various operating operations, the air is discharged to reduce the system pressure and protect the safety of the rubber liner and the tank body. This structure is provided with a pressure display. Each unit is installed with a pressure gauge and a pressure transmitter when leaving the factory, which can effectively monitor whether the pressure of the airbag 7 is abnormal. At the same time, an alarm element is set when the airbag 7 is ruptured or damaged during the design of the tank body. The photoelectric liquid level switch, the pressure and liquid level monitoring equipment and the airbag 7 damage alarm equipment are equipped with a Modbus RS485 communication interface and a secondary instrument.

[0075] In actual working process, the main body is laid down, the airbag 7 is first opened and then rolled up and placed in the main body 61. The operator enters the main body through the maintenance hole, opens the airbag 7, and then fixes the airbag 7 on the main body through the upper flange 67 and the lower flange 66. The gas leakage test is performed on all gas connections with soapy water. If there is a leakage, all the media (gas and water) in the water hammer tank are discharged, the leakage is repaired and then re-tested.

[0076] This structure is installed downstream of the pump check valve, the closer to the check valve the better, and a check valve is installed between the pipeline network and this structure, so that there is a way to separate this structure from the pipeline network, and a bypass pipe is installed between the check valve and this structure, and a drain valve is installed on the bypass pipe.

[0077] In order to prevent the airbag 7 from entering the pipeline and getting stuck and damaged when the system pressure is low, a protective tube 65 is arranged at the place where the inner liner type water hammer elimination tank is connected to the pipeline. The protective tube 65 is spherical, and a plurality of top holes 662 are arranged on the top of the protective tube 65, and a plurality of side holes 663 are arranged on the side. The sum of the areas of all the top holes 662 and the side holes 663 is equal to the total area of ​​the inlet and outlet water pipes, so that water can smoothly enter and exit the inner liner type water hammer elimination tank. Since the diameters of the top holes 662 and the side holes 663 are small, the airbag 7 can be effectively prevented from entering the pipeline and getting stuck and damaged.

[0078] The inner tank type water hammer elimination tank is connected to the pressure water supply pipeline on the outlet side of the water pump. It is used to eliminate the water hammer when the pump stops. It consists of a pressure tank (containing an air-water separation air bag) and related auxiliary equipment. It works by using the specific law of gas volume and pressure. As the pressure in the pipeline changes, the inner tank type water hammer elimination tank replenishes water to the pipeline or absorbs the excessive pressure in the pipeline. When the water pump suddenly stops running, the pressure at the beginning of the pressure water supply pipeline decreases. The inner tank type water hammer elimination tank replenishes water to the pipeline, which can effectively balance the low pressure. At this time, the amount of water in the inner tank type water hammer elimination tank decreases and the gas expands; when the water hammer wave returns, the pressure at the beginning of the pressure water supply pipeline increases, and the inner tank type water hammer elimination tank is filled with water to absorb the excessive pressure in the pipeline. The amount of water in the inner tank type water hammer elimination tank increases, and the gas is compressed, which acts as an air cushion, thereby effectively resisting the adverse effects of water hammer on the pipeline system.

[0079] The method for using the intelligent water hammer elimination tank system includes the following steps:

[0080] S1, installing the body 61 and the airbag 7, fixing the body 61 on the ground, unfolding the airbag 7, rolling it up and putting it into the body 61, and then fixing the airbag 7 to the body 61, and setting the outlet of the airbag 7 to be connected with the medium transmission;

[0081] S2, install and test the parts. The control center 100 is electrically connected to the liquid level sensor, pressure sensor, air supply valve actuator 80 and leak detection sensor to control them and display data in real time on the human-machine interface touch screen 200; perform an overall sealing test, and the test is qualified if there is no water leakage;

[0082] When judging whether there is a leakage, when the product value of the actual pressure and volume in the inner liner type water hammer elimination tank 6 is less than 90% of the initial value, an alarm should be able to be triggered. According to the law of isothermal change of gas, the product value of the actual pressure and volume of the compressed nitrogen in the inner liner type water hammer elimination tank 6 should be a certain value. When the product value of the actual pressure and volume in the inner liner type water hammer elimination tank 6 is less than 90% of the initial value, it means that the nitrogen in the inner liner type water hammer elimination tank 6 has leaked. Whether there is a leakage can be judged by monitoring the relationship between the water level height H of the pressurized water inside the airbag 7 and the pressure in the inner liner type water hammer elimination tank 6. The pressure in the inner liner type water hammer elimination tank 6 and the water level height H inside the airbag 7 are in a one-to-one correspondence. When the actual liquid level height inside the airbag 7 is higher than the liquid level height it should be, it means that the nitrogen has leaked.

[0083] Implementation plan: When the water pump 5 is turned on and the pipeline begins to flow water into the inner tank type water hammer elimination tank 6, the corresponding data of pressure and liquid level height are recorded and plotted into a curve, and a set value is plotted, such as Figure 8 As shown in line B in the figure, the 90% curve of (the actual pressure and volume product value) is as follows: Figure 8 As shown by line A in the figure, when the actual liquid level is higher than the red line under the corresponding pressure, an alarm signal is issued.

[0084] S3, real-time monitoring during operation and determination of whether to perform air replenishment. Based on the determination result, whether to perform air replenishment is performed. Assume that the pressure of the pre-charged compressed gas is P1, the volume of the water hammer elimination tank is V1, the gas pressure during operation is P2, and the volume of the compressed gas during operation is V2;

[0085] V1 is the known initialization parameter input, and P1 and P2 are acquired by the pressure sensor;

[0086] According to the law of isothermal change of gas: P1×V1=P2×V2, the volume of compressed gas during operation V2=P1V1 / P2. At the same time, the volume of water in the airbag V3=V1-V2 is calculated;

[0087] According to the relationship between the tank volume and the water level (as shown below), calculate the water level H during operation;

[0088]

[0089] R is the inner radius of the body;

[0090] The calculated height H is compared with the actual liquid level h collected by the liquid level sensor, and an early warning or control instruction is automatically issued. When the actual height h collected and the calculated height H exceed the normal deviation, the intake valve is automatically controlled to replenish air.

[0091] Because the gas pressure in the nitrogen chamber is always equal to the water inlet pressure of the air pressure tank, we cannot use the pressure reading of the pressure gauge or pressure sensor to measure whether the nitrogen is decreasing. Although nitrogen is difficult to dissolve in water, it will gradually decrease over time. If the air is not replenished regularly, it will affect the air pressure tank's ability to prevent water hammer. The change in nitrogen volume can be judged by monitoring the liquid level height of the liner type water hammer elimination tank.

[0092] If the amount of nitrogen in the nitrogen chamber decreases, the steady-state water level will gradually rise. When the steady-state water level reaches the set height, the solenoid valve on the nitrogen cylinder inlet pipe opens and nitrogen is replenished into the tank. As the amount of nitrogen in the nitrogen chamber increases, the liquid level slowly decreases. When the liquid level drops to the original steady-state level, the solenoid valve is cut off and the nitrogen cylinder stops replenishing gas.

[0093] After the initial installation is completed, enter the initial pre-filling pressure value P1 in the human-machine interface. After switching to start, the control cabinet automatically controls the air inlet valve and the air source device to start inflating the tank. It stops after reaching the preset air pressure P1, and the control cabinet automatically calculates the working parameters of the system after normal water flow. After normal water flow, a graphical display of the system working status is performed, and the current actual working status, air pressure P2, water level h, etc. are displayed in real time. When an abnormality occurs, the actual collected liquid level h and the calculated liquid level H exceed the tolerance, and the air inlet valve and the source device are controlled to start air replenishment; after detecting a leak in the inner tank, an early warning is issued.

[0094] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. How to use the intelligent water hammer elimination tank system, Features: The intelligent water hammer elimination tank system is installed downstream of the pump check valve, and a maintenance valve is installed between the pipeline network and the present structure to separate the present structure from the pipeline network. A bypass pipe is installed between the maintenance valve and the present structure, and a drain valve is installed on the bypass pipe. The intelligent water hammer elimination tank system includes a body and an air bag arranged in the body, the outlet of the air bag is connected to the medium transmission pipeline and an impedance component is arranged between the two; a liquid level sensor for collecting liquid in the body is arranged on the side of the body; a pressure sensor is arranged on the upper end of the body to collect the pressure of the gas in the body; an inflation nozzle is also arranged on the upper end of the body, and the inflation nozzle is connected to the air source device through an air supply pipe, and an air supply valve actuator is arranged on the air supply pipe, and a leak detection sensor is arranged at the bottom of the body; the liquid level sensor, pressure sensor, air supply valve actuator and leak detection sensor are all electrically connected to the control center through a control line; The impedance component comprises an impedance main pipe and an impedance branch pipe, one end of the impedance main pipe is connected to the outlet of the water hammer elimination tank, and the other end is connected to the medium transmission pipeline. The impedance main pipe is provided with a first manual valve, a second check valve and a second manual valve in sequence from the end of the medium transmission pipeline to the water hammer elimination tank. The second check valve is opened when the water hammer elimination tank replenishes water to the medium transmission pipeline, and is closed otherwise; the two ends of the impedance branch pipe are connected to the two ends of the second check valve, and the impedance branch pipe is provided with a manual ball valve connected in parallel with the second check valve; the medium transmission pipeline is provided with a water pump and a first check valve, and the impedance main pipe is provided at one end of the first check valve away from the water pump and close to the side of the medium flow direction; The first manual valve and the second manual valve are both manual eccentric hemispherical valves, the first check valve is an axial flow check valve, the medium forms a water column in the medium transmission pipeline, after the water pump stops, when the inertia of the water column is exhausted, that is, when the forward flow rate is reduced to 0, the first check valve is closed, and the first manual valve and the second manual valve are both in a normally open state. When replenishing water, the impedance main pipe and the impedance branch pipe are opened at the same time, the manual ball valve and the second check valve are opened, and the second check valve on the impedance main pipe only replenishes water to prevent water backflow, so that the impedance of the water hammer elimination tank replenishing water to the medium transmission pipeline must be less than the impedance of the pipeline filling water to the inner liner water hammer elimination tank; the water hammer The elimination tank is an inner tank type water hammer elimination tank, and the main body of the water hammer elimination tank is a vertical structure; the upper end of the main body is provided with an upper flange connected by a thread, and the lower end is provided with a lower flange connected by a thread; the main body is a cavity tank structure, and an air bag is arranged inside the main body, and the upper flange is pressed and fixed to the upper end of the air bag, and the lower flange is pressed and fixed to the lower end of the air bag; a protective tube is provided on the upper end surface of the lower flange; the protective tube extends upward into the main body, and a gap for installing the air bag is reserved between the protective tube and the inner wall of the main body, and a through hole is provided on the protective tube, and the sum of the areas of the through holes is equal to the total area of ​​the inlet and outlet water pipes; The upper end surface of the protective tube is spherical, and the through hole includes a top hole and a side hole. The top hole is arranged on the upper spherical surface of the protective tube, and the side hole is arranged on the side of the protective tube. The medium is connected with the medium flow pipeline through the side hole and the top hole. The diameter of the top hole is smaller than the diameter of the side hole. The diameter of the top hole is 8-12mm. The top holes are evenly distributed on the protective tube. From the top view of the protective tube, three adjacent top holes on different straight lines form an equilateral triangle structure. The following steps are included: S1. Install the body and the airbag, fix the body on the ground, unfold the airbag, roll it up and put it into the body, then fix the airbag to the body, and connect the outlet of the airbag to the medium transmission; S2. Install and test the parts. The control center is electrically connected to the liquid level sensor, pressure sensor, air supply valve actuator and leak detection sensor to control them and display the data on the human-machine interface touch screen in real time. Perform an overall sealing test and the test is qualified if there is no water leakage. S3, real-time monitoring during operation and determination of whether to perform air replenishment. Based on the determination result, whether to perform air replenishment is performed. Assume that the pressure of the pre-charged compressed gas is P1, the volume of the water hammer elimination tank is V1, the gas pressure during operation is P2, and the volume of the compressed gas during operation is V2; V1 is the known initialization parameter input, and P1 and P2 are acquired by the pressure sensor; According to the law of isothermal change of gas: P1×V1=P2×V2, the volume of compressed gas during operation V2=P1V1 / P2, and the volume of water in the airbag V3=V1-V2 is calculated at the same time; Calculate the water level H during operation; the relationship between the tank volume and the water level is as follows: R is the inner radius of the body; The calculated height H is compared with the actual liquid level h collected by the liquid level sensor, and an early warning or control instruction is automatically issued. When the actual height h collected and the calculated height H exceed the normal deviation, the intake valve is automatically controlled to replenish air.

2. The method for using the intelligent water hammer elimination tank system according to claim 1, Features: The control center includes a control cabinet and a human-machine interface touch screen. The control cabinet is controlled by a PLC program and can be installed in a pump room. The human-machine interface touch screen can display data in real time and realize human-machine interaction.

3. The method for using the intelligent water hammer elimination tank system according to claim 1, Features: The liquid level sensor is a magnetic flap level gauge, which directly reflects the liquid level height and feeds back to the control center. The pressure sensor includes a pressure transmitter and a shock-resistant pressure gauge. The pressure transmitter is used to monitor the pressure in the body, and the shock-resistant pressure gauge is used to measure the gas pressure in the body. The body is also provided with a safety valve and a maintenance valve. The safety valve is used to release the gas pressure in the body, and a stop valve is provided between the inflation nozzle and the body.

4. The method for using the intelligent water hammer elimination tank system according to claim 1, Features: The top of the protective tube is arranged higher than the smallest end of the inner wall of the main body, and the distances between the two sides of the protective tube and the inner wall of the main body are consistent. A guide ring is arranged below the upper flange, and the lower end surface of the guide ring is arranged lower than the upper end of the inner wall of the main body. A circulation hole is arranged on the guide ring. A maintenance ladder is arranged on the side of the main body, and the maintenance ladder is connected to the main body through a reinforcing rod. A support is arranged at the lower end of the main body, and the support is fixedly connected to the ground through anchor screws.

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