CN100365216C - A secondary pressurized pump station water supply system - Google Patents

Abstract

A water supply system for a secondary pressurized pumping station, the system has dual water sources for water supply from a reservoir and a municipal water inlet pipe; the municipal water inlet pipe (13) is connected to the reservoir (6) It is also connected with the residual pressure utilization adjustment tank (1) through the pipeline (9) with check valve and solenoid valve; the residual pressure utilization adjustment tank passes through the return water pipeline (10) with check valve and gate valve or butterfly valve ) is connected to the water inlet pipe (15) and enters the reservoir, and a liquid level control device (12) is installed at the end of the water inlet pipe (15), a connecting pipe (3) with a check valve and a gate valve or a butterfly valve, and a small frequency conversion pump The connecting pipe (4) of the group and the connecting pipe (5) with a large frequency conversion pump group are connected in parallel, the parallel water outlet is connected with the user water pipe (14), and the parallel water inlet is connected with the residual pressure utilization adjustment tank (1 ) outlet pipe is connected with the reservoir outlet pipeline (11) with gate valve or butterfly valve. Compared with conventional secondary pressurized pumping stations, it can save energy by 30-80%, and save about 50% of the volume of the reservoir. It is suitable for new construction, reconstruction and expansion of pumping stations, and overcomes the disadvantages of existing water supply methods.

Description

A secondary pressurized pump station water supply system

technical field

The invention relates to a midway or end pressurization system of a water supply pipe network in municipal engineering, in particular to a water supply system for a secondary pressurization pump station.

Background technique

With the development of the city, the secondary pressurized pump station for urban water supply has become an indispensable part of the water supply for residential quarters and urban high-rise buildings. This is because the local water pressure of the urban water supply network is not high enough to send water directly to high-rise buildings. The water pressure at the end of the water supply pipe network is lower, so the water must be supplied to the users through the secondary pressurization pump station to ensure the water requirements of each user, so the secondary pressurized water supply is a large water consumer in the city.

At present, the conventional working method of the secondary pressurization pump station is to use the water in the municipal pipe network to directly enter the low-level reservoir to store and adjust the water volume, and then use the pressurized water pump to absorb water from the low-level reservoir and send it to the upper level. user. In this way, the residual pressure of the city's water supply pipe network (varies with the position of the booster pump station in the municipal pipe network, generally at 0.18Mpa-0.50Mpa) is completely reactively consumed, wasting energy. The reason why the secondary pressurized pump station works like this is because: (1) the water supply company does not allow the water pump to pump water directly from the urban pipe network, which will cause the pressure of the water supply pipe network to drop during the peak of water consumption and affect the water supply capacity of the pipe network; (2) The incoming water volume of the urban pipe network is changing, and the pumping volume of the pressurized water pump cannot be guaranteed at all times, and the stable and normal operation of the pressurized water pump cannot be guaranteed. In order for the water pump to work stably, a water storage tank must be installed to adjust the water volume, store a large flow, and adjust Small flow, to make full use of the residual pressure of the urban pipe network, the above two problems must be solved.

Existing pumping station energy-saving water supply measures include frequency conversion energy saving, power transmission and transformation system energy saving, motor energy saving, no negative pressure pipe network residual pressure energy saving, etc. Among them, frequency conversion energy saving has been developed relatively maturely, such as the constant pressure frequency conversion described in CN2344445Y patent The water supply system saves about 30% energy on the basis of the original power frequency pump water supply method. In recent years, in order to use the residual pressure of the pipeline network to save energy, China has appeared a pipeline network residual pressure utilization device and a non-negative pressure water supply device. The patent announcement number is CN2471837Y The utility model patent titled Pipe Network Residual Pressure Utilization Device discloses a "Pipe Network Residual Pressure Utilization Device". The pool of the device is equipped with a jet tube and a mixing diffuser, and the jet tube and the mixing diffuser are arranged on the same axis. Above, the injection pipe is connected to the water inlet pipe, and the mixing diffuser is connected to the water pump; the utility model has a simple structure, makes full use of the remaining pressure energy of the pipe network, and saves a large amount of electric energy for the operation of the pump station, but the disadvantages are: the utilization of the residual pressure of the pipe network It is difficult for the device to form the water inlet mode of the water ejector under the condition of low pipe network pressure. Only when a certain pressure is reached can the high-pressure water belt and low-pressure water have a certain energy-saving effect, so the energy-saving effect is not very good, and the reservoir The number of cycles of the water in the storage tank does not meet the design requirements, which will easily cause the water quality of the storage tank to deteriorate. It is more complicated to transform because the jet pipe and the mixing diffuser are provided in the storage tank. The patent announcement number is CN2703798Y, and the patent name is "Pipeline Network Negative Pressure Water Supply Equipment", including the water inlet pipe connected to the pipe network, the flow regulating tank, the normal pressure water supply pipe with check valve, the pressurized water supply pipe, and the series connection pump The water pump unit of the check valve, the water outlet main pipe connected to the user pipeline, the control cabinet, the flow regulating tank is connected to the water inlet pipe through a bypass pipe, and an automatic air intake and exhaust device and a liquid level controller are installed on it, and the water outlet main pipe There is a pressure sensor on the top, and the water pump unit, the liquid level controller, and the pressure sensor are connected with the control cabinet. The utility model bypass pipe is connected to the bottom of the flow regulating tank. Its structure is compact and reasonable, which greatly saves the length of the pipeline, is easy to arrange, and is convenient to install and connect. It will not cause negative pressure to the tap water pipe network or other water supply pipe networks. Reasonable use of tap water pipe network pressure water supply can play the role of pressurization, steady flow and flow regulation. It is an ideal pipe network non-negative pressure water supply equipment. However, there are disadvantages: since there is no equipment for adjusting and storing water sources, using this equipment during peak water consumption will cause a sharp drop in the pressure of the surrounding pipe network, which will affect the safety of municipal water supply. Moreover, this kind of equipment is limited by the municipal water supply company, and can only be used for water supply with small water supply volumes such as newly built single or several buildings. Beijing Water Supply Company stipulates that installation is allowed only when the water supply flow rate is below 20m3/h. Therefore, when the water volume is greater than this value, or when the community needs to build domestic water storage and fire water tanks, this equipment cannot be used, and it cannot be used for the transformation and new construction of the existing large-scale community water supply pressurization system.

Contents of the invention

The energy-saving water supply system of the secondary pressurization pump station of the present invention makes full use of the residual pressure of the pipe network to save energy, overcomes the problem of waste of residual pressure existing in the existing secondary pressurization technology, and also overcomes the problems of the residual pressure utilization device of the pipe network and the non-loading of the pipe network. Pressure water supply equipment has shortcomings such as unsafe water supply and small scope of application. The system not only has a self-control feedback device, but also has the ability to adjust water volume, store water pressure and distribute water by using the regulating tank for residual pressure in the system. An energy-saving water supply system for pressurized pumping stations with high safety performance and wide application range (applicable to newly built and renovated pressurized pumping stations of various sizes).

Technical scheme of the present invention:

A water supply system for a secondary pressurized pumping station, comprising a water storage tank, a pump group, a connecting pipeline, a residual pressure utilization regulating tank, a control device, a pressure sensor, a liquid level feedback device, and a liquid level control device.

The system has dual water supply from the reservoir and the municipal water inlet pipe;

The municipal water inlet pipe is connected to the reservoir through the municipal water inlet pipe with a solenoid valve, and is also connected to the residual pressure utilization regulating tank through a pipeline with a check valve and a solenoid valve;

The residual pressure utilization regulating tank is connected to the municipal water inlet pipe with solenoid valve through the return water pipeline with check valve and gate valve or butterfly valve, and enters the reservoir, and a liquid level control device is installed at the end of the municipal water inlet pipe with check valve The connecting pipes of gate valves or butterfly valves, the connecting pipes with variable frequency small pump sets and the connecting pipes with variable frequency large pump sets are connected in parallel. The outlet pipe of the regulating tank is connected with the outlet pipe of the reservoir with gate valve or butterfly valve;

The control device is connected with electromagnetic valves, large and small pumps, pressure sensors and liquid level feedback devices on the pipeline.

Compared with the prior art, the present invention has the following effects:

The energy-saving water supply system for the secondary pressurized pump station of the present invention is applicable to newly-built and renovated secondary pressurized pump stations of various sizes, and the energy-saving efficiency is also vary. Adopting the technology of the present invention to transform the existing conventional secondary pressurized pumping station can make full use of the original frequency conversion equipment, which not only saves the cost of transformation, but also can further save 30-80% of the operating cost of the pumping station on the basis of frequency conversion water supply; for Newly built pumping stations, using this invention technology can not only achieve the above-mentioned energy-saving effect, but also reduce the volume of the reservoir by about 50% on the basis of the original secondary water supply, or even eliminate the reservoir, which can effectively save the initial investment and Construction period; whether this technology is used in new pumping stations or renovation of old pumping stations, it can effectively use the residual pressure of the pipe network wasted by conventional secondary water supply pumping stations to achieve the purpose of energy saving; at the same time, it can also effectively avoid no negative pressure When the water supply device is used by users at a peak time, because the water supply network cannot meet the user's requirements, water cutoff or excessive suction of pipe network water will cause the water pressure of the surrounding water supply network to drop, which will seriously affect the water supply capacity of residents.

For example, taking a pressurized pump station with a water supply of 20,000 tons/day, the inlet pressure of the pump station is 0.18Mpa, and the outlet pressure of the pump station is 0.4Mpa. Using this water supply energy-saving system can save energy by 50% on the basis of the original secondary pressurization. About 4,000 yuan per day can be saved in electricity bills, and the daily water supply in Beijing is about 20 million tons. If Beijing adopts this patented technology on the basis of the original secondary pressurization pump station, the energy saving rate will be 30% on the existing basis. It is estimated that Beijing can save about 4.8 million yuan in electricity bills per day, and 1.44 billion yuan in electricity bills can be saved based on 300 days a year. It can not only effectively alleviate the power shortage in Beijing, but also reduce water supply costs. To reduce the burden on users and municipal water supply departments, if it is extended to the whole country, it will have greater economic and social benefits.

Description of drawings

Fig. 1 is a schematic diagram of a water supply system of a secondary pressurization pumping station.

In the figure: excess pressure utilization regulating tank 1, control device 2, connecting pipeline with check valve and gate valve or butterfly valve 3, connecting pipeline with small frequency conversion pump group 4, connecting pipeline with large frequency conversion pump group 5, storage Pool 6, pressure sensors 7 and 8, pipeline with check valve and solenoid valve 9, return pipeline with check valve and gate valve or butterfly valve 10, reservoir outlet pipeline with gate valve or butterfly valve 11 , a liquid level control device 12, a municipal water inlet pipe 13, a user water pipe 14, a municipal water inlet pipe 15 with a solenoid valve, and a liquid level feedback device 16.

Detailed ways

Figure 1 is a schematic diagram of an energy-saving water supply system for a secondary pressurized pumping station, which includes a residual pressure utilization regulating tank 1, a control device 2, a connecting pipeline 3 with a check valve and a gate valve or a butterfly valve, and a small pump set with frequency conversion Connecting pipeline 4, connecting pipeline 5 with frequency conversion large pump group, reservoir 6, pressure sensors 7 and 8, pipeline with check valve and solenoid valve 9, return pipe with check valve and gate valve or butterfly valve Road 10, reservoir water outlet pipeline 11 with gate valve or butterfly valve, liquid level control device 12, municipal water inlet pipe 13, user water pipe 14, municipal water inlet pipe 15 with solenoid valve, liquid level feedback device 16.

The system has a water reservoir 6 and a municipal water inlet pipe 13 for dual water supply. The municipal water inlet pipe 13 is connected to the reservoir 6 through a municipal water inlet pipe 15 with a solenoid valve, and also through a pipeline with a check valve and a solenoid valve. 9 is connected with the excess pressure utilization adjustment tank 1; the excess pressure utilization adjustment tank 1 is connected with the municipal water inlet pipe 15 with a solenoid valve through the return water pipeline 10 with a check valve and a gate valve or a butterfly valve. A liquid level control device 12 is installed at the end of the municipal water inlet pipe 15 with a solenoid valve, and the residual pressure is used to adjust the tank 1 and the water from the reservoir 6 passes through the connecting pipe 3 with a check valve and a gate valve or a butterfly valve, and a small pump set with frequency conversion The connection pipeline 4, the connection pipeline 5 with the frequency conversion large pump group are connected to the user water pipe 14;

The control device 2 is connected with the solenoid valves on the pipelines 9 and 15 , the large and small pumps on the pipelines 4 and 5 , the pressure sensors 7 and 8 , and the liquid level feedback device 16 .

During the operation of the system, the control device 2 receives the pressure feedback signals from the pressure sensors 7 and 8, and sends signals to the solenoid valves on the pipelines 9 and 15 and the large and small pumps on the pipelines 4 and 5 through the device processing to control the system flexibly and timely operation mode to achieve effective energy-saving purposes. When the pool water level reaches the set maximum or minimum water level, the control device 2 receives the feedback signal from the liquid level feedback device 16. After processing, the control device 2 will send a control signal to the system to start and stop the large and small pumps to protect the water supply of the pump station For the purpose of system safety, the control device of this system can be designed according to the different operating modes. The internal components of the control device are all national standard products, and the assembly of the control device is easy to realize.

The system operates in three situations:

The first operation situation: when the water pressure and water volume of the municipal pipe network can meet the water requirements of users, and at the same time, when the pressure of the municipal pipe network is greater than the minimum water supply pressure required by the water supply department, the pressure sensors 7 and 8 send signals to the control device 2 , the control device 2 transmits a command signal to close the electromagnetic valve on the municipal water inlet pipe 15 with the electromagnetic valve, and open the electromagnetic valve with the pressure check valve and the electromagnetic valve pipeline 9, and now the pumping station is fed from the municipal water inlet pipe 13. Water is directly supplied to the user through the pipeline 9, and the residual pressure is directly supplied to the user by the regulating tank 1 and the connecting pipeline 3 with a check valve and a gate valve or a butterfly valve. Pool 6, the water level of the reservoir rises, and the liquid level control device 12 rises. When reaching the highest water level set by the liquid level feedback device 16, the liquid level control device closes the water inlet of the pipe network to prevent the water from overflowing the pool. At this time, the large and small pumps All of them are out of service. Compared with the conventional secondary pressurization pump station, which puts the pressurized water of the municipal pipe network into the reservoir, and then uses the frequency conversion pump to pump water from the low-level reservoir to supply the user, it will be greatly reduced due to the deactivation of the large and small pumps. Greatly save the operating cost of the pumping station during this period;

The second operation situation: when the water volume of the municipal pipe network meets the pressure but cannot meet the user's water requirements, and at the same time, when the pressure of the municipal pipe network is greater than the minimum water supply pressure required by the water supply department, the pressure sensors 7 and 8 send signals to the control device 2 to control The device 2 transmits a command signal to open the solenoid valve on the pipeline 9 with pressure check valve and solenoid valve, close the solenoid valve on the municipal water inlet pipe 15 with the solenoid valve, and start the connecting pipeline 4 with the frequency conversion small pump group The frequency conversion small pump on the pump, the pump station enters water from the municipal water inlet pipe 13, through the pipeline 9 with pressure check valve and solenoid valve, and the residual pressure uses the regulating tank 1 and the connecting pipeline 4 with the frequency conversion small pump group to supply water to the user , the excess water returns to the reservoir 6 through the return pipeline 10 with check valves and gate valves or butterfly valves, the water level of the reservoir rises, and the small pump with a lower head is activated through the control device 2 while the large pump is deactivated. The water directly enters the small pump, which greatly increases the water inlet pressure in front of the small pump and reduces the working head of the pump. Compared with the conventional secondary pressurization pump station, the pressurized water of the municipal pipe network is put into the reservoir, and then the frequency conversion pump is used to Compared with the operation mode of pumping water from the low-level reservoir to supply users, the operating cost of the pumping station during this period is greatly saved due to the increase of the water inlet head of the small pump;

The third operation situation: when the pressure and water volume of the municipal pipe network cannot meet the user's water consumption or a fire occurs, the pressure sensors 7 and 8 send signals to the control device 2, and the control device sends out an instruction signal to open the valve with check valve and solenoid valve. The solenoid valve on the valve pipeline 9 and the solenoid valve on the municipal water inlet pipe 15 with a solenoid valve, the pumping station comes in from the municipal water inlet pipe 13, enters the residual pressure using the regulating tank 1 and the reservoir 6, and passes through the valve with a check valve. The pipeline 9 of the return valve and solenoid valve, the residual pressure is supplied to the user through the regulating tank 1 and the connecting pipeline 5 with a large frequency conversion pump group. At this time, only the large pump with a higher head is used and the small pump is disabled. The inlet water and the outlet water of the reservoir are mixed and directly enter the large pump, which effectively increases the inlet pressure of the large pump and reduces the working head of the pump. Compared with the conventional secondary pressurization pump station, the pressurized water of the municipal pipe network is put into Compared with the operation mode of pumping water from the low-level reservoir to the user with the frequency conversion pump, the operation cost of the pumping station during this period is greatly saved due to the increase of the water inlet head of the large pump;

Through the above three water supply methods, any pump station using this invention technology can ensure that the residual pressure in the pipe network can be used effectively and safely at any time of the day to directly or indirectly increase the inlet water pressure of the pump, directly Or indirectly supply water to users. At the same time, when users use water at peak times, this pump station water supply method can effectively avoid the problem that the pressure drop around the water supply pipe network caused by the direct pumping of the municipal pipe network by the non-negative pressure water supply system affects the water use of surrounding residents. Moreover, the present invention is not only suitable for newly-built pumping stations, but also suitable for transforming existing secondary pumping stations. It is not limited by the water inlet pressure of the pumping station, the water supply area of the pumping station, the water supply flow rate and the water pressure, and is suitable for large, medium and small Various secondary pressurization pump stations, depending on the position of the pump station in the municipal pipe network, the residual pressure of the pipe network is also different at about 0.18-0.50Mpa, the minimum residual pressure is 0.18Mpa, and the energy-saving effect is also different According to the productive test, the energy-saving rate is generally 30-80% compared with the operation of the existing conventional secondary pressurized pumping station, and the adjustment volume of the storage tank is saved by about 50%.

Claims (1)

1. secondary pressing pump station water supply system, comprise that reservoir, pump group, connecting pipe, overbottom pressure utilize regulating tank, control device, pressure sensor, liquid level feedback device, fluid level control device, it is characterized in that this system has reservoir (6) and municipal water inlet pipe (13) double water source supplies water;

Municipal administration water inlet pipe (13) links to each other with reservoir (6) by the municipal water inlet pipe (15) that has electromagnetic valve, also utilizes regulating tank (1) to link to each other by having flap valve with electromagnetic valve pipeline (9) and overbottom pressure simultaneously;

Overbottom pressure utilizes regulating tank (1) to link to each other with the municipal water inlet pipe (15) that has electromagnetic valve by the water return pipeline (10) that has flap valve and gate valve or butterfly valve, enter reservoir (6), at the terminal fluid level control device (12) of installing of municipal water inlet pipe (15), the connecting pipe (3) of band flap valve and gate valve or butterfly valve, have the connecting pipe (4) of the little pump group of frequency conversion and have (5) three connecting pipe parallel connections of connecting pipe of the big pump group of frequency conversion, water side in parallel links to each other with user's water pipe (14), and water inlet end in parallel utilizes regulating tank (1) outlet pipe to link to each other with the reservoir outlet pipeline (11) that has gate valve or butterfly valve with overbottom pressure;

Described control device (2) with have flap valve and electromagnetic valve pipeline (9) on electromagnetic valve and pressure sensor (7), user's water pipe (14) on pressure sensor (8), have electromagnetic valve on the municipal water inlet pipe (15) of electromagnetic valve, have the little pump group of frequency conversion on the connecting pipe (4) of the little pump group of frequency conversion, have the big pump group of frequency conversion on the connecting pipe (5) of the big pump group of frequency conversion, the liquid level feedback device (16) in the reservoir (6) links to each other.

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