CN113026865A - Energy-saving step pump station system for waterproof hammer and operation method for waterproof hammer - Google Patents
Energy-saving step pump station system for waterproof hammer and operation method for waterproof hammer Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
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- E—FIXED CONSTRUCTIONS
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- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
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- E—FIXED CONSTRUCTIONS
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- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/02—Arrangements or adaptations of tanks for water supply for domestic or like local water supply
- E03B11/06—Arrangements or adaptations of tanks for water supply for domestic or like local water supply with air regulators
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
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Abstract
The invention discloses a waterproof hammer energy-saving step pump station system and discloses a corresponding waterproof hammer operation method.A electric control device acquires the flow velocity of water in a water delivery main pipe at each electromagnetic valve once every 0.5 second through each flow velocity sensor, and compares v1 and v2 according to the data of the flow velocity sensor at each electromagnetic valve, wherein v1 is the flow velocity measured by the flow velocity sensor before 0.5 second, and v2 is the flow velocity measured by the current flow velocity sensor; when v1 is less than or equal to v2, the risk that the flow speed is reduced to 0 does not exist; when v1 is greater than v2, the electric control device calculates the time T required by the flow rate to be reduced to 0 according to a formula I; the formula is as follows: t-v 2/Δv; wherein Δ v is v 1-v 2; when T is less than or equal to TG +0.25 second, the electric control device controls the corresponding electromagnetic valve to close. The invention effectively protects water resources from being largely lost due to pipeline bursting caused by water hammer phenomenon, protects the environment of the approach of water diversion engineering from being damaged due to pipeline bursting, and has positive technical significance, environmental protection significance and economic significance.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering, in particular to a step pump station system.
Background
The water supply of the cascade pump station is increasingly widely applied in China, and some problems are also exposed. Among them, the water hammer is a problem that may cause serious damage to the pipeline, the water pump and other facilities. The most common water hammer accidents occur when the pump is stopped, and particularly the water hammer phenomenon is easily caused under the condition of stopping the pump in accidents. The accident stop pump can be caused by misoperation, lightning stroke, power failure and the like.
The water hammer phenomenon may cause a great loss. For example, the Feng Jia mountain water diversion project of Bao chicken city continuously generates 6 tube explosions in the year 1999 and 2005, which causes large-area water cut-off in the urban area, causes direct economic loss of tens of millions of yuan, brings negative social influence, and brings great inconvenience to water use and normal life in the water supply area. Water hammer accidents can also cause personal injury and death. The protection of water resources and the protection of the environment of the water diversion engineering approach place from being damaged are important environmental protection subjects, and water hammer accidents can cause the problems of large water resource loss, damage to the environment of the water diversion engineering approach place and the like. At present, China increasingly pays more attention to environmental protection, and more scientific and effective water hammer prevention measures are necessarily researched.
The existing waterproof hammer technology comprises the following steps:
1. a surge tank. The pressure regulating tower has the characteristic of free water surface, and can alleviate the pressure change in the pipeline, thereby achieving the purpose of reflecting water hammer waves. The height of the bidirectional pressure regulating tower is higher than the highest water pressure line, is mainly used for the conditions of low lift and large flow, and is generally arranged at the downstream of a pump station or a part which can generate negative pressure. The defects of the method are that the installation position is limited, the engineering quantity is large, the cost is high, and the method is not suitable for the condition of high lift.
2. An air tank. The air tank has obvious positive and negative pressure protection effect, is not limited by places during installation, is suitable for a pumping device with small flow and high lift, but has large flow, increased tank volume and high manufacturing cost, and is generally not acceptable in engineering application. If combined with other water hammer protection measures, the volume of the air tank may be reduced accordingly.
3. And an air inlet valve and an air outlet valve. The air inlet and outlet valve not only discharges redundant gas in the process of first water filling and normal operation of the pump station, ensures the designed water passing capacity, but also can supplement air into the pipe when negative pressure occurs in the pipeline. The structure is simple, the safety and the convenience are realized, the manufacturing cost is low, the limit of installation conditions is avoided, the management and the maintenance are required frequently, the independent waterproof hammer measure cannot be taken, and the effective waterproof hammer effect can be achieved only by combining other waterproof hammer measures.
4. Hydraulic control slow-closing check valve. The pump station rear outlet pipeline usually adopts a hydraulic control slow-closing check valve, and the valve can be used as a main valve and also can be used as an overhaul valve, can be closed in stages when suddenly shut down, and reduces pipeline pressure fluctuation. The problem with a pilot operated slow shut-off check valve is that in principle it is a passively closed valve, which starts the shut-off process immediately after a sudden pump stop, and the time of the staged shut-off is constant, independent of the actual flow changes in the pipeline. If the valve closing is too slow, the phenomena of water backflow and water pump reversal cannot be prevented, and if the valve closing is too fast, great hydraulic impact is borne; water hammer may occur either too quickly or too slowly to close the valve. In a word, the hydraulic control slow-closing check valve only reduces the probability of water hammer during pump stopping and cannot eliminate the phenomenon of water hammer during pump stopping.
Disclosure of Invention
The invention aims to provide a water hammer-preventing energy-saving step pump station system, which can realize that a valve is closed by still water when a pump is stopped, and eliminate the phenomenon of water hammer when the pump is stopped.
In order to achieve the purpose, the water hammer prevention energy-saving step pump station system comprises a water delivery main pipe, the total water delivery direction is taken as the downstream direction, the upstream end of the water delivery main pipe is communicated with a water source, and the water delivery main pipe gradually rises along the upstream direction and the downstream direction;
the water conveying main pipe is sequentially provided with a first-stage pump station, a second-stage pump station and N stages of pump stations at intervals along the upstream direction and the downstream direction, wherein N is a natural number; each stage of pump station is provided with a pump station forebay and a water pump,
the device also comprises an electric control device, and the electric control device is connected with a display screen;
a plurality of electromagnetic valves for closing valves by still water so as to prevent water hammer are arranged on the water conveying main pipe between two adjacent stages of pump stations at intervals, and the water conveying main pipe at each electromagnetic valve is provided with a flow velocity sensor; each electromagnetic valve and each flow velocity sensor are respectively connected with an electric control device and the electric control device acquires electric energy, the electric control device is connected with a storage battery, and the storage battery is connected to a power grid through the electric control device; the electromagnetic valves correspond to the flow velocity sensors one by one;
the electric control device is connected with the water pumps of all stages of pump stations, the time from the receiving of the closing valve control signal to the complete closing of the electromagnetic valve is valve closing time TG, and the valve closing time of each electromagnetic valve is stored in the electric control device.
A plurality of water chambers are arranged on the water delivery main pipe at intervals, the top of each water chamber is a conical top with a small upper part and a big lower part, and the upper end of the conical top is connected with a manual air release valve; the side wall of the downstream direction in the water chamber is connected with a high-pressure air bag.
And water level sensors are arranged in pump station foreponds of all stages of pump stations and are connected with an electric control device.
The invention also discloses a water hammer prevention operation method of the water hammer prevention energy-saving step pump station system, in the normal operation process of each stage of pump station, the electric control device obtains the flow velocity of water in the water delivery main pipe at each electromagnetic valve once every 0.5 second through each flow velocity sensor, and compares v1 and v2 according to the data of the flow velocity sensor at each electromagnetic valve, wherein v1 is the flow velocity measured by the flow velocity sensor before 0.5 second, and v2 is the flow velocity measured by the current flow velocity sensor; when v1 is less than or equal to v2, the risk that the flow speed is reduced to 0 does not exist;
when v1 is greater than v2, the electric control device calculates the time T required by the flow rate to be reduced to 0 according to a formula I;
the formula is as follows: t-v 2/Δv; wherein Δ v is v 1-v 2;
when T is less than or equal to TG +0.25 second, the electric control device controls the corresponding electromagnetic valve to close.
The water pumps of all stages of pump stations are variable frequency water pumps; the method also comprises a water pump frequency control method:
the working personnel controls the running frequency of the water pump of the first-stage pump station according to the required total water supply flow and the water supply height of the first-stage pump station;
the electric control device is internally stored with the lowest water pump running frequency Mmin required by each stage of pump station to realize the design water supply height;
the electric control device controls the running frequency of the water pump from the second-stage pump station to the N-stage pump station according to the following algorithm:
the designed highest water level in the front pool of the specific pump station is H m, and the actual water level height measured by the water level sensor is H1 m; the conditions for starting the water pump for the first time are as follows: h1 is not less than (1/3) multiplied by H; the highest running frequency of the water pump is Mmax; the water pump running frequency controlled when the water pump is started for the first time is as follows: 0.5 (Mmax-Mmin) + Mmin;
in the operation process after the initial start, for any specific pump station from the second-stage pump station to the N-stage pump station, the electric control device continuously acquires the water level in the front pool of the corresponding pump station through the corresponding water level sensor;
when the (1/3) xH is less than or equal to H1 is less than or equal to (2/3) xH, the electric control device keeps the running frequency of the water pump unchanged;
when (1/3) xH is larger than H1, the electric control device reduces the running frequency of the water pump every 30 seconds, wherein the frequency of each reduction is 0.1 xMmax, until the pump is stopped or H1 is not less than (1/3) xH;
when (2/3) xH is less than H1, the electric control device raises the running frequency of the water pump every 30 seconds, wherein the raising frequency is 0.1 xMmax every time until Mmax is reached or (2/3) xH is more than or equal to H1.
The invention has the following advantages:
the invention originally realizes the measure of closing the valve by still water, realizes that the water in the pipeline is just basically in a static state when the valve is closed by a formula I through continuously monitoring the flow rate in unit time, and can avoid the situation that the closing action of the traditional hydraulic control slow-closing check valve is not matched with the flow rate of the water in the pipeline when the valve is closed, thereby eliminating the water hammer phenomenon.
The water hammer phenomenon necessarily requires abnormal flow of water in the pipeline. By adopting the invention, the valve is closed by the static water, the water hammer accidents similar to Feng Jiashan water diversion engineering in Bao chicken city can be basically avoided, the continuous water supply of downstream water consumption units, farmlands and families is ensured, the environmental problem and the water resource waste problem caused by the burst of a water supply system and the large amount of water flowing into the environment are prevented, and the water resource loss, the environmental loss and the economic loss caused by the interruption of water supply are avoided.
The invention relates to a water hammer prevention energy-saving step pump station system and a water hammer prevention operation method thereof, which can effectively prevent water resources from being largely lost due to pipeline bursting caused by a water hammer phenomenon, prevent the environment of the water project approach place from being damaged due to pipeline bursting, and have positive technical significance and environmental protection significance.
Specifically, by adopting the water hammer prevention energy-saving step pump station system and the water hammer prevention operation method, the electric control device obtains electric energy from the storage battery to continue working when the water pumps of some or all pump stations stop operating due to factors such as power grid accidental power failure in the operation process. The time required by the flow rate to be reduced to 0 is continuously calculated by an electric control device formula I, when the time is less than the valve closing time duration plus 0.25 second, the electric control device controls the corresponding electromagnetic valve to be closed, so that the flow at the position of the electromagnetic valve is about 0 (may be a positive value or a negative value, but is certainly close to 0) when the electromagnetic valve is completely closed, the water flow at the position is blocked under the basic still water state, the still water valve which cannot be achieved in the prior art is realized, and the pump stopping water hammer phenomenon (the pump stopping water hammer phenomenon is the most common in various water hammer phenomena) in the system is basically avoided.
The water chamber has an exhaust function and a buffering function. The conical top is easy to gather gas, and a worker can open the manual air release valve during patrol to remove gas gathered in the water chamber. When the water pressure in the water delivery main pipe is suddenly reduced, the high-pressure air bag is expanded so as to slow down the reduction speed of the water pressure until the buffering effect is achieved; when the water pressure in the water delivery main pipe suddenly rises, the high-pressure air bag is further compressed, so that the rising speed of the water pressure is reduced, and the buffering effect is achieved. The gas can be discharged, and the intensity of the water pressure change is reduced, so that the possibility of water hammer generation in the system is reduced, the effect of reducing the generation probability is realized not only for the water hammer which is most likely to generate when the pump is stopped, but also for other water hammers such as water hammers which are started to pump and the like.
The water delivery main pipe can be connected with water delivery branch pipes used by users in different areas along the way, and a plurality of factors and variables such as total water supply, water supply along the way, water supply lift and the like exist in the water supply process of the whole system. The water pump frequency control method is very simple, the total water supply requirement of a user is embodied in the control of the first-stage pump station, and other pump stations only need to control the water level in the forebay within a reasonable range, so that the control of the water pumps from the second-stage pump station to the N-stage pump station is simplified, unnecessary pump stopping of the water pumps of all stages of pump stations is avoided to the greatest extent, and the effects of stable working state and energy conservation are realized. When the total water demand corresponding to the water delivery main pipe changes, the water supply amount of the first-stage pump station only needs to be adjusted, and other pump stations can be adjusted in a self-adaptive mode according to the method of the invention, so that the method is very convenient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a water chamber;
fig. 3 is a schematic diagram of the electrical control principle of the present invention.
Detailed Description
As shown in fig. 1 to 3, the energy-saving cascade pump station system comprises a water delivery main pipe 1, wherein the total water delivery direction is the downstream direction, the upstream end of the water delivery main pipe 1 is communicated with a water source 2, and the water delivery main pipe 1 gradually rises along the upstream direction and the downstream direction;
the water delivery main pipe 1 is sequentially provided with a first-stage pump station 3, a second-stage pump station 4 and N stages of pump stations 5 at intervals along the upstream direction and the downstream direction, wherein N is a natural number larger than 2; each stage of pump station is provided with a pump station forebay and a water pump 11, and the pump station forebay is in the conventional technology and is not shown in the figure.
The device also comprises an electric control device 6, wherein the electric control device 6 is connected with a display screen 7;
a plurality of electromagnetic valves 8 for closing valves by still water so as to prevent water hammer are arranged on the water conveying main pipe 1 between two adjacent stages of pump stations at intervals, and the water conveying main pipe 1 at each electromagnetic valve 8 is provided with a flow velocity sensor 9; each electromagnetic valve 8 and each flow velocity sensor 9 are respectively connected with the electric control device 6 and the electric control device 6 obtains electric energy, the electric control device 6 is connected with a storage battery 10, and the storage battery 10 is connected to a power grid through the electric control device 6; the electromagnetic valves 8 correspond to the flow velocity sensors 9 one by one; the electric control device 6 only uses the electric energy of the storage battery 10 to maintain the normal work of the electric control device, the electromagnetic valves 8 and the sensors, and the working electricity of the water pumps 11 in all stages of pumping stations comes from the power grid.
The electric control device 6 is connected with the water pumps 11 of all stages of pump stations, the water pumps 11 of all stages of pump stations are connected to a power grid to obtain electric energy, and the electric control device 6 controls and obtains the starting and stopping states of the water pumps 11 of all stages of pump stations;
the time from the receiving of the closing valve control signal from the electric control device 6 to the complete closing of the electromagnetic valves 8 is a valve closing time length TG (unit is second), and the valve closing time length of each electromagnetic valve 8 is stored in the electric control device 6; the valve closing time of each solenoid valve 8 is either provided by the manufacturer of the solenoid valve 8 or is determined by actual measurement. The electric control device 6 adopts a PLC or an industrial control computer, is a conventional technology and is not detailed in detail.
A plurality of water chambers 12 are arranged on the water delivery main pipe 1 at intervals, the tops of the water chambers 12 are conical tops 13 with small tops and big bottoms, and the upper ends of the conical tops 13 are connected with manual air release valves 14; a high pressure air bag 15 is connected to the downstream side wall of the inside of the water chamber 12.
The water chamber 12 has a degassing function and a buffering function. The conical top 13 is easy to gather gas, and a worker can open the manual air release valve 14 to remove the gas gathered in the water chamber 12 during patrol. When the water pressure in the water delivery main pipe 1 is suddenly reduced, the high-pressure air bag 15 is expanded so as to slow down the reduction speed of the water pressure until the buffering effect is achieved; when the water pressure in the water delivery main 1 suddenly rises, the high-pressure air bag 15 is further compressed to slow down the rising speed of the water pressure, and the buffering effect is achieved. The gas can be discharged, and the intensity of the water pressure change is reduced, so that the possibility of water hammer generation in the system is reduced, the effect of reducing the generation probability is realized not only for the water hammer which is most likely to generate when the pump is stopped, but also for other water hammers such as water hammers which are started to pump and the like.
And water level sensors 16 are arranged in pump station foreponds of all stages of pump stations, and each water level sensor 16 is connected with the electric control device 6.
The invention also provides a water hammer prevention running method of the water hammer prevention energy-saving step pump station system, in the normal running process of each stage of pump station, the electric control device 6 obtains the flow velocity of water in the water conveying main pipe 1 at each electromagnetic valve 8 once every 0.5 second through each flow velocity sensor 9, and compares v1 and v2 (the units of v1 and v2 are both meters per second) according to the data of the flow velocity sensor 9 at each electromagnetic valve 8, wherein v1 is the flow velocity measured by the flow velocity sensor 9 before 0.5 second, and v2 is the flow velocity measured by the current flow velocity sensor 9; when v1 ≦ v2, there is no risk that the flow rate drops to 0, i.e., the water pump may not be in a state where it has suddenly stopped.
When v1 > v2, the electronic control device 6 calculates the time T (in seconds) required for the flow rate to drop to 0 according to the formula I;
the formula is as follows: t-v 2/Δv; wherein Δ v is v 1-v 2;
when T is less than or equal to TG +0.25 second, the electric control device 6 controls the corresponding electromagnetic valve 8 to close. When the solenoid valve 8 is fully closed, the water flow rate there is close to zero.
By adopting the water hammer prevention energy-saving step pump station system and the water hammer prevention operation method, the electric control device 6 obtains electric energy from the storage battery 10 to continue working when the water pumps 11 of some or all pump stations stop operating due to factors such as power failure caused by accidents of a power grid and the like in the operation process. The time required by the flow rate to be reduced to 0 is continuously calculated by the formula I of the electric control device 6, when the time is less than the valve closing time duration plus 0.25 second, the electric control device 6 controls the corresponding electromagnetic valve 8 to be closed, so that the flow at the position of the electromagnetic valve 8 is about 0 (may be a positive value or a negative value, but is certainly close to 0) when the electromagnetic valve 8 is completely closed, the water flow at the position is blocked in a basic still water state, the still water valve which cannot be achieved in the prior art is realized, and the pump stopping water hammer phenomenon (the pump stopping water hammer phenomenon is the most common of various water hammer phenomena) in the system is basically avoided.
The water pumps 11 of all stages of pump stations are variable frequency water pumps 11; the invention also comprises a water pump frequency control method:
the working personnel controls the running frequency of the water pump 11 of the first-stage pump station 3 according to the required total water supply flow and the water supply height of the first-stage pump station 3 (namely the height difference between the first-stage pump station 3 and the second-stage pump station 4);
the electric control device 6 is internally stored with the lowest water pump running frequency Mmin required by each stage of pump station to realize the designed water supply height; the Mmin value is determined by the design water supply height of the water pump 11 and the characteristics of the water pump 11, and is obtained by a performance manual or actual measurement of the water pump 11.
The electric control device 6 controls the running frequency of the water pumps 11 from the second-stage pump station 4 to the N-stage pump station 5 according to the following algorithm:
the designed highest water level in the front pool of the specific pump station is H meters, and the actual water level height measured by the water level sensor 16 is H1 meters; the conditions for the initial start-up of the water pump 11 are: h1 is not less than (1/3) multiplied by H; the highest operating frequency of the water pump 11 is Mmax; the water pump operating frequency controlled when the water pump 11 is started for the first time is: 0.5 (Mmax-Mmin) + Mmin;
in the operation process after the initial start, for any specific pump station from the second-stage pump station 4 to the N-stage pump station 5, the electric control device 6 continuously acquires the water level in the front pool of the corresponding pump station through the corresponding water level sensor 16;
when the (1/3) xH is less than or equal to H1 is less than or equal to (2/3) xH, the electric control device 6 keeps the running frequency of the water pump 11 unchanged;
when (1/3) xH is more than H1, the electric control device 6 reduces the running frequency of the water pump 11 every 30 seconds, and the frequency of each reduction is 0.1 xMmax until the pump is stopped or H1 is more than or equal to (1/3) xH;
when (2/3). times.H < H1, the electric control device 6 increases the operating frequency of the water pump 11 every 30 seconds, wherein the frequency of each increase is 0.1 Mmax, until Mmax is reached or (2/3). times.H.gtoreq.H 1.
The water delivery main pipe 1 can be connected with water delivery branch pipes used by users in different areas along the way, and a plurality of factors and variables such as total water supply, water supply along the way, water supply lift and the like exist in the water supply process of the whole system. The water pump frequency control method is very simple, the total water supply requirement of a user is embodied in the control of the first-stage pump station 3, and other pump stations only need to control the water level in the forebay within a reasonable range, so that the control of the water pumps 11 of the second-stage pump stations 4 to the N-stage pump stations 5 is simplified, unnecessary pump stopping in midway is avoided to the maximum extent by the water pumps 11 of all the pump stations, and the effects of stabilizing the working state and saving energy are realized. When the total water demand corresponding to the water delivery main pipe 1 changes, the water supply amount of the first-stage pump station 3 only needs to be adjusted, and other pump stations can be adjusted in a self-adaptive mode according to the method of the invention, so that the method is very convenient.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The water hammer-resistant energy-saving step pump station system comprises a water delivery main pipe, wherein the total water delivery direction is taken as a downstream direction, the upstream end of the water delivery main pipe is communicated with a water source, and the water delivery main pipe gradually rises along the upstream direction and the downstream direction;
the water conveying main pipe is sequentially provided with a first-stage pump station, a second-stage pump station and N stages of pump stations at intervals along the upstream direction and the downstream direction, wherein N is a natural number; each stage of pump station is provided with a pump station forebay and a water pump,
the method is characterized in that: the device also comprises an electric control device, and the electric control device is connected with a display screen;
a plurality of electromagnetic valves for closing valves by still water so as to prevent water hammer are arranged on the water conveying main pipe between two adjacent stages of pump stations at intervals, and the water conveying main pipe at each electromagnetic valve is provided with a flow velocity sensor; each electromagnetic valve and each flow velocity sensor are respectively connected with an electric control device and the electric control device acquires electric energy, the electric control device is connected with a storage battery, and the storage battery is connected to a power grid through the electric control device; the electromagnetic valves correspond to the flow velocity sensors one by one;
the electric control device is connected with the water pumps of all stages of pump stations, the time from the receiving of the closing valve control signal to the complete closing of the electromagnetic valve is valve closing time TG, and the valve closing time of each electromagnetic valve is stored in the electric control device.
2. The waterproof hammer energy-saving step pump station system according to claim 1, characterized in that: a plurality of water chambers are arranged on the water delivery main pipe at intervals, the top of each water chamber is a conical top with a small upper part and a big lower part, and the upper end of the conical top is connected with a manual air release valve; the side wall of the downstream direction in the water chamber is connected with a high-pressure air bag.
3. The waterproof hammer energy-saving step pump station system according to claim 1 or 2, characterized in that: and water level sensors are arranged in pump station foreponds of all stages of pump stations and are connected with an electric control device.
4. The method for operating a water hammer resistant energy saving step pump station system according to claim 3, characterized in that:
in the normal operation process of each stage of pump station, the electric control device acquires the flow velocity of water in the water delivery main pipe at each electromagnetic valve once every 0.5 second through each flow velocity sensor, and compares v1 and v2 according to the data of the flow velocity sensor at each electromagnetic valve, wherein v1 is the flow velocity measured by the flow velocity sensor before 0.5 second, and v2 is the flow velocity measured by the current flow velocity sensor; when v1 is less than or equal to v2, the risk that the flow speed is reduced to 0 does not exist;
when v1 is greater than v2, the electric control device calculates the time T required by the flow rate to be reduced to 0 according to a formula I;
the formula is as follows: t-v 2/Δv; wherein Δ v is v 1-v 2;
when T is less than or equal to TG +0.25 second, the electric control device controls the corresponding electromagnetic valve to close.
5. The method of operating a waterproof hammer according to claim 4, wherein: the water pumps of all stages of pump stations are variable frequency water pumps; the method also comprises a water pump frequency control method:
the working personnel controls the running frequency of the water pump of the first-stage pump station according to the required total water supply flow and the water supply height of the first-stage pump station;
the electric control device is internally stored with the lowest water pump running frequency Mmin required by each stage of pump station to realize the design water supply height;
the electric control device controls the running frequency of the water pump from the second-stage pump station to the N-stage pump station according to the following algorithm:
the designed highest water level in the front pool of the specific pump station is H m, and the actual water level height measured by the water level sensor is H1 m; the conditions for starting the water pump for the first time are as follows: h1 is not less than (1/3) multiplied by H; the highest running frequency of the water pump is Mmax; the water pump running frequency controlled when the water pump is started for the first time is as follows: 0.5 (Mmax-Mmin) + Mmin;
in the operation process after the initial start, for any specific pump station from the second-stage pump station to the N-stage pump station, the electric control device continuously acquires the water level in the front pool of the corresponding pump station through the corresponding water level sensor;
when the (1/3) xH is less than or equal to H1 is less than or equal to (2/3) xH, the electric control device keeps the running frequency of the water pump unchanged;
when (1/3) xH is larger than H1, the electric control device reduces the running frequency of the water pump every 30 seconds, wherein the frequency of each reduction is 0.1 xMmax, until the pump is stopped or H1 is not less than (1/3) xH;
when (2/3) xH is less than H1, the electric control device raises the running frequency of the water pump every 30 seconds, wherein the raising frequency is 0.1 xMmax every time until Mmax is reached or (2/3) xH is more than or equal to H1.
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| CN113026865B (en) | 2022-05-03 |
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