Universe monitoring gradient pressure regulating water supply system capable of relay networking

Abstract

A global monitoring gradient pressure regulating water supply system capable of being networked in a relay mode comprises a municipal pipeline, a regulation and storage device and two or three vertically-partitioned partition water supply pipe networks. The partitioned water supply pipe network comprises a water inlet pipeline, unequal full variable frequency pump sets, a water outlet pipeline, an air pressure water tank and a user pipe network. The air pressure water tank is provided with a tank body pressure sensor and is connected into a water outlet pipeline; a near-end pressure sensor is arranged at the most favorable water supply point of the user pipe network, and a tip pressure sensor is arranged at the most unfavorable water supply point of the user pipe network; according to the utility model, redundant water heads of incoming water of municipal pipelines are fully utilized; the variable-frequency water pumps in all the subareas run in the high-efficiency area in the non-small-flow period and are matched with the lowest pressure required by the most unfavorable point; the air pressure water tank carries out high-pressure large-capacity water replenishing in the early stage of the small-flow water using stage, and the starting and stopping frequency and the operation time of the full-variable-frequency water pump are greatly reduced. Therefore, the water supply system is energy-saving and efficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to secondary water supply field, especially relates to pipe network pressure superposed water supply system. BACKGROUND

[0002] The application of digital integrated full variable frequency water pump realizes real-time dynamic adjustment of variable frequency water pump instantaneous flow, thereby accurately controls secondary water supply user pipe network water pressure, and provides excellent conditions for efficient and energy-saving secondary water supply.

[0003] At present, variable frequency water supply of secondary water supply pipe network without setting water supply subarea adopts the following two forms:

[0004] First, constant pressure water supply. A pressure sensor is arranged at the water outlet end of the variable frequency water pump, regardless of how the user pipe network uses water changes, the variable frequency water pump adjusts the instantaneous flow in real time, and the pressure at the water outlet end of the variable frequency water pump is constant. The biggest advantage of this method is that the monitoring unit, execution unit and control unit are arranged centrally, which is convenient for installation and daily maintenance, but in order to ensure that the water supply pressure of the disadvantageous point of the user pipe network during the water use peak period, the constant pressure at the water outlet end of the variable frequency water pump is set with a certain redundancy, which causes the water supply pressure during most periods to be higher than the actual demand, thereby causing waste of energy.

[0005] Second, variable pressure and flow water supply, also known as end constant pressure water supply. That is, a pressure sensor is arranged at the most disadvantageous water supply point of the user pipe network end, and the output pressure and flow of the variable frequency water pump change in real time to ensure that the end pressure is constant. However, this technical solution has a problem that when the water use pipe network runs in the non-efficient area during the water use trough period, the variable frequency water pump can meet the water pressure of the user pipe network, the variable frequency water pump is often stopped, and water supply is carried out by the air pressure tank at the water outlet end of the variable frequency water pump. However, due to the characteristics of variable pressure and flow output of the variable frequency water pump, the output pressure of the variable frequency water pump is small during the water use trough period, so that the water storage capacity of the air pressure tank is low, the air pressure tank supplies water to the user pipe network for a short time, and the variable frequency water pump is frequently started and stopped. If the variable frequency water pump is continuously pressurized to supply water during the water use trough period, the variable frequency water pump will run in the low efficiency area for a long time, which also leads to high energy consumption.

[0006] Similarly, the two single user pipe network water supply forms described above are connected in series to form a network, and each water supply subarea also has the non-energy-saving disadvantages described above. UTILITY MODEL CONTENTS

[0007] In order to overcome the above defects, the purpose of the utility model is to provide a full-area user pipe network pressure monitoring, which can form a set of water supply network, and can also provide relay networking for places requiring subarea water supply. The water supply system performs gradient pressure regulation according to the trough period and non-trough period of each subarea user pipe network to realize an energy-saving relayable networking water supply system.

[0008] The utility model discloses a kind of global monitoring gradient pressure regulating water supply systems of relay networking, including: municipal pipeline, regulating and storing device, more than one partition water supply pipe network of vertical partitioning;

[0009] The partition water supply pipe network includes water inlet pipeline, unequal amount of full variable frequency pump group, water outlet pipeline, air pressure water tank and user pipe network.

[0010] The full variable frequency pump group includes one or more than one same power high-power master pump and one low-power slave pump connected in parallel.

[0011] The rated flow of the slave pump is not less than the minimum flow value of the master pump in the high-efficiency operating interval, and the options of the slave pump meet the following conditions: among all pump types with a rated flow not less than the minimum flow value, the pump type with the smallest difference from the minimum flow value of the master pump in the high-efficiency operating interval is selected as the slave pump.

[0012] The water inlet pipeline, the full variable frequency pump group and the water outlet pipeline are connected in sequence along the water flow line.

[0013] The air pressure water tank is provided with a tank pressure sensor, and the air pressure water tank is connected to the water outlet pipeline.

[0014] The water inlet end of the user pipe network is connected to the water outlet end of the water outlet pipeline.

[0015] A near-end pressure sensor is arranged at the most favorable water supply point of the user pipe network, and a distal-end pressure sensor is arranged at the least favorable water supply point of the user pipe network.

[0016] The municipal pipeline is connected to the regulating and storing device.

[0017] The water inlet end of the water inlet pipeline in the partition water supply pipe network in the low water supply area is connected to the water outlet end of the regulating and storing device, and the water inlet end of the water inlet pipeline in the partition water supply pipe network for relay networking is sequentially connected to the water outlet end of the water outlet pipeline below the partition water supply pipe network.

[0018] For the method of operating the global monitoring gradient pressure regulating water supply system for relay networking, the monitoring values of the distal-end pressure sensor and the near-end pressure sensor in each partition water supply pipe network are only used to control the operation of the full variable frequency pump group in the user pipe network, and the monitoring values of the distal-end pressure sensor and the near-end pressure sensor have the following logical relationship with the operation of the full variable frequency pump group:

[0019] Parameter setting:

[0020] The minimum required water supply pressure is Pmin, so the minimum water supply pressure at the end of the pipe network, i.e., the least favorable water supply point, of each vertical partition is Pmin.

[0021] The maximum water supply pressure of each vertical partition is Pmax, and the maximum water supply pressure of the near end of the pipe network, i.e., the most favorable water supply point of each partition, is Pmax;

[0022] The rated flow of the main pump is Qmain, and the high-efficiency flow range of the main pump is set to α% to 100% (α≤50) at the factory;

[0023] The rated flow of the secondary pump is Qsec, and the secondary pump is required to be Qsec≥α%*Qmain when selected, and the high-efficiency flow range of the secondary pump is set to β% to 100% (β≤50) at the factory;

[0024] The number of main pumps in the full variable frequency pump group corresponding to the partition water supply pipe network is M;

[0025] The real-time monitoring pressure value of the distal pressure sensor is Pfar;

[0026] The real-time monitoring pressure value of the near-end pressure sensor is Pclose;

[0027] The real-time monitoring pressure of the tank pressure sensor is Ppv;

[0028] To meet the water pressure setting requirements of the user pipe network, the full variable frequency pump group or the air pressure water tank needs to provide the instantaneous flow of the user pipe network water supply Qout;

[0029] Operation steps:

[0030] Run in the non-small flow period:

[0031] The discrimination standard of the non-small flow period is that Pfar=Pmin is required, and when the real-time change of the user water taking of the partition water supply pipe network and the water taking of the water inlet pipeline of the partition water supply pipe network connected through the upper relay network causes the balance to be broken, the Pfar value is increased or decreased by increasing or decreasing the instantaneous flow of the full variable frequency pump group, and the balance is achieved by dynamically adjusting the Pfar value. During this process, Qout>β%*Qsec;

[0032] This period requires that under the real-time change of the user water consumption, the instantaneous flow of the full variable frequency pump group is adjusted to meet Pfar=Pmin, that is, the minimum compliant water supply pressure of the most unfavorable water supply point of the user pipe network of the partition is provided, so as to ensure that the energy consumption of the full variable frequency pump group of the partition is the lowest. The operation logic of the main pump and the secondary pump in the full variable frequency pump group is as follows:

[0033] When β%*Qsec<Qout≤Qsec;

[0034] The main pumps are all closed; the instantaneous flow of the slave pump is adjusted to meet the flow output requirement of the full variable frequency pump group, that is, the flow threshold output can be achieved by adjusting the instantaneous flow of the slave pump, and the slave pump always operates in the high efficiency interval;

[0035] When Qsec < Qout ≤ M*Qmain,

[0036] The slave pump is closed; the number of the main pumps that are turned on is ⌈Qout / Qmain⌉, and real-time adjustment is performed, and the instantaneous flow output by each main pump is the same, which is Qout / ⌈Qout / Qmain⌉, that is, the flow threshold output can be achieved by adjusting the number of main pumps that are turned on and the flow output by each main pump, and the main pumps that are turned on always operate in the high efficiency interval;

[0037] When M*Qmain < Qout ≤ M*Qmain+β%*Qsec

[0038] The instantaneous flow of the slave pump is β%*Qsec; the main pumps are all turned on and real-time adjustment is performed, and the instantaneous flow output by each main pump is the same, which is (Qout-β%*Qsec) / M, that is, the slave pump runs at a constant instantaneous flow in the high efficiency interval at the flow threshold output, and the required instantaneous flow Qout can be achieved by adjusting the instantaneous flow of the main pumps, and the main pumps also always operate in the high efficiency interval;

[0039] When M*Qmain+β%*Qsec < Qout ≤ M*Qmain+Qsec, the main pumps are all turned on, and the instantaneous flow of each main pump is the same, which is Qmain; the slave pump adjusts the flow in real time to meet the changing flow output requirement of the full variable frequency pump group, at this time, the main pumps all operate in the high efficiency interval at the rated flow; the slave pump adjusts the flow in real time to meet the changing flow output requirement of the full variable frequency pump group, at this time, the instantaneous flow of the slave pump is greater than β%*Qsec, and the slave pump also operates in the high efficiency interval.

[0040] In a small flow period:

[0041] The small flow period is a period in which Qout ≤ β%*Qsec; that is, during the running process in step, when it is required to provide the instantaneous flow of the user pipe network as Qout ≤ β%*Qsec to meet Pfar=Pmin, that is, when the instantaneous flow of the full variable frequency pump group is lower than the lower limit of the flow output threshold of the high efficiency interval of the slave pump, the energy consumption of the full variable frequency pump group for water supply is higher, and therefore the small flow scheme is adopted for running, and the step is switched to this step;

[0042] Running step:

[0043] In the process of switching from non-small flow period to small flow period, the instantaneous flow of the full variable frequency pump set is dynamically adjusted so that Pclose=Pmax; the running logic of the master pump and the slave pump in the full variable frequency pump set is step (1), in which process, as the water supply pressure increases, the excess output water enters the air pressure tank, and the water storage capacity of the air pressure tank is continuously increased, that is, in this step, the process of adjusting the instantaneous flow of the full variable frequency pump set is synchronized with the increase of the water supply pressure, according to Boyle-Mariotte law, the process pressurizes the air pressure tank by storing water, and the water storage capacity of the air pressure tank is also increased synchronously; the purpose of this process is to adjust the water pressure supplied by the full variable frequency pump set to the corresponding user pipe network to the upper limit of the local required user pipe network water pressure, so that the air pressure tank can supplement the maximum allowable water capacity, so as to prolong the air pressure tank water supply time to the user pipe network as much as possible, thereby prolonging the shutdown time of the full variable frequency water pump after the air pressure tank supplies water in the small flow period to facilitate energy saving;

[0044] After Pclose=Pmax, Ppv is monitored and the rising rate, that is, the value of ΔPpv, is calculated until ΔPpv=0, that is, Ppv reaches the peak value, and the air pressure tank reaches the peak value of the allowable range of water storage capacity, and the full variable frequency pump set stops running;

[0045] The air bag in the air pressure tank is gradually reduced by extrusion and drains water outward to realize external water supply, and Pfar value is monitored;

[0046] During the operation of the above step, the Pfar monitoring value gradually decreases, and when Pfar=Pmin, the operation step of the non-small flow period is switched to.

[0047] The above-mentioned operation has the following advantages:

[0048] The full variable frequency pump set runs in the high efficiency area in the non-small flow area, and the water flow of the full variable frequency pump set meets the minimum value of the water pressure at the end of the same subarea water supply pipe network, so as to realize the lowest energy consumption;

[0049] Due to the setting of the low-power slave pump, the small flow area is small, and the high efficiency running range of the full variable frequency pump set is increased;

[0050] The process of increasing the instantaneous flow of the full variable frequency pump set and pressurizing the air pressure tank to supplement water before switching to small flow operation is added, so that the water storage and energy storage of the air pressure tank are greatly increased, and the air pressure tank water supply time in the small flow period at night is greatly increased after the full variable frequency pump set is stopped, so that the full variable frequency pump set can sleep for a long time, avoiding frequent start and stop of the full variable frequency pump set or long time running in the low efficiency area;

[0051] The full variable frequency pump set running in the lower subarea water supply pipe network only needs to match the monitoring value of the pressure sensor in the subarea, without considering the use of water in the upper subarea water supply pipe network through the water inlet pipe.

[0052] The higher partition water supply network can take water from the air pressure tank of the lower partition water supply network during the starting process of the full variable frequency pump group of the higher partition water supply network, avoids the linkage form that the upper full variable frequency pump group is started again after the lower full variable frequency pump group is started during the relay water supply process, and greatly simplifies the control mechanism.

[0053] Further, the operation method of the relay networking global monitoring gradient pressure regulating water supply system and the risk early warning method are as follows:

[0054] Parameter setting:

[0055] The nominal pressure of the air pressure tank is PN;

[0056] The maximum pressure allowed to be borne by the air pressure tank during operation is γ%*PN (50<γ<100)

[0057] Risk early warning step:

[0058] When Ppv=γ%*PN, the full variable frequency pump group corresponding to the partition water supply network where the air pressure tank is located and the full variable frequency pump group corresponding to the partition water supply network above the air pressure tank stop running and wait for maintenance.

[0059] Considering that the water head of the municipal pipeline is used to the maximum extent, and the municipal pipeline is not subjected to negative pressure during the water peak period, the structure of the regulating and storage device includes a water tank and a steady flow tank.

[0060] The water tank and the steady flow tank are connected to the water inlet connection pipeline of the water outlet end of the municipal pipeline.

[0061] The water inlet connection pipeline of the water tank is provided with a float ball valve at the end.

[0062] The water inlet connection pipeline of the steady flow tank is provided with a water inlet pressure sensor and an electric valve in sequence along the water flow direction.

[0063] The water outlet end pipeline of the water tank is connected to the steady flow tank, and the connection pipeline is provided with a water supplement pump and a water supplement pressure sensor in sequence along the water flow direction.

[0064] The water outlet end of the steady flow tank is connected to the water inlet pipeline of the low area.

[0065] The operation method of the regulating and storage device is as follows, and the parameter setting is as follows:

[0066] The real-time monitoring point pressure value of the water inlet pressure sensor is Pmun.

[0067] The real-time monitoring point pressure value of the water supplement pressure sensor is Pup.

[0068] The minimum pressure value of the municipal pipeline inflow is Pneg, which is set to ensure that the municipal pipeline has no negative pressure;

[0069] The operation step for ensuring that the municipal pipeline has no negative pressure is:

[0070] When Pmun is greater than or equal to Pneg, the electric valve is fully opened;

[0071] When Pmun is less than Pneg, the opening of the electric valve is adjusted to make Pmun equal to Pneg, and the water supplement pump is started and the instantaneous flow is adjusted to make Pup equal to Pneg.

[0072] The utility model has the advantages and positive effects that: the excess water head of municipal pipeline inflow is fully utilized; the frequency conversion water pumps of each partition are operated in the high efficiency area during the period of non-small flow, and are matched with the minimum pressure required by the most unfavorable point; the air pressure water tank is supplemented with high pressure and large capacity in the early stage of the small flow water consumption stage, which greatly reduces the start-stop times and operation time of the full frequency conversion water pump. Thus, energy saving and high efficiency of the water supply system are realized. BRIEF DESCRIPTION OF DRAWINGS

[0073] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0074] Figure 1 It is a schematic diagram of the utility model's relay networking global monitoring gradient pressure regulating water supply system;

[0075] In the figure, municipal pipeline-1, regulating and storing device-2, water tank-21, floating ball valve-211, water supplement pump-212, water supplement pressure sensor-213, steady flow tank-22, water inlet pressure sensor-221, electric valve-222, partitioned water supply pipe network-3, water inlet pipeline-31, full frequency conversion pump group-32, main pump-321, slave pump-322, water outlet pipeline-33, air pressure water tank-34, tank body pressure sensor-341, user pipe network-35, near-end pressure sensor-351, and distal end pressure sensor-352. DETAILED DESCRIPTION

[0076] The utility model will be described in more detail below with reference to the drawings, in which the preferred embodiments of the utility model are shown, and it should be understood that the skilled person in the art can modify the utility model described herein while still achieving the advantageous effects of the utility model. Therefore, the following description should be understood as extensive knowledge for the skilled person in the art, and not as a limitation on the utility model.

[0077] As shown in Figure 1 Figure 1, embodiment 1:

[0078] A relayable networking global monitoring gradient pressure water supply system, comprising: a municipal pipeline 1, a regulating and storing device 2, one or more than one vertical partitioned partitioned water supply pipeline network 3;

[0079] The regulating and storing device 2 comprises a water tank 21 and a steady flow tank 22.

[0080] The water tank 21 and the steady flow tank 22 are connected to the water inlet pipeline and the water outlet end of the municipal pipeline 1.

[0081] The water inlet pipeline of the water tank 21 is provided with a float valve 211 at the end.

[0082] The water inlet pipeline of the steady flow tank 22 is provided with a water inlet pressure sensor 221 and an electric valve 222 in sequence along the water flow direction.

[0083] The water outlet end of the water tank 21 is connected to the steady flow tank 22, and the connecting pipeline is provided with a water supplement pump 212 and a water supplement pressure sensor 213 in sequence along the water flow direction.

[0084] The water outlet end of the steady flow tank 22 is connected to the water inlet pipeline 31 of the low area.

[0085] The partitioned water supply pipeline network 3 comprises a water inlet pipeline 31, a variable frequency pump group 32 with different powers, a water outlet pipeline 33, an air pressure tank 34 and a user pipeline network 35.

[0086] The variable frequency pump group 32 comprises one or more than one main pump 321 with the same power and a large power and a slave pump 322 with a small power.

[0087] The rated flow of the slave pump 322 is not less than the minimum flow value of the main pump 321 in the high efficiency operation interval, and the options of the slave pump 322 satisfy that in all pump types with the rated flow not less than the minimum flow value, the pump type with the minimum difference value from the minimum flow value of the main pump 321 in the high efficiency operation interval is selected as the slave pump.

[0088] The water inlet pipeline 31, the variable frequency pump group 32 and the water outlet pipeline 33 are connected in sequence along the water flow direction.

[0089] The air pressure tank 34 is provided with a tank pressure sensor 341, and the air pressure tank is connected to the water outlet pipeline 33.

[0090] The water inlet end of the user pipeline network 35 is connected to the water outlet end of the water outlet pipeline 33.

[0091] The user pipeline network 35 is provided with a near-end pressure sensor 351 at the most favorable water supply point and a distal-end pressure sensor 352 at the least favorable water supply point.

[0092] The municipal pipeline 1 is connected to the regulating and storing device 2.

[0093] The water inlet end of the water inlet pipe 31 in the district water supply pipe network 3 of the low water supply area is connected to the water outlet end of the regulating and storing device 2, and the water inlet end of the water inlet pipe 31 in the relay network of the district water supply pipe network 3 is connected to the water outlet end of the water outlet pipe 33 below the district water supply pipe network in sequence.

[0094] The above has carried out the detailed explanation to the utility model through the example, but the content is only the preferred embodiment of the utility model, cannot be considered for limiting the implementation scope of the utility model. All equivalent changes and improvements made in the utility model application scope should still belong to the patent coverage range of the utility model.

Claims

1. A relayable networking global monitoring gradient pressure regulating water supply system, characterized in that, The utility model relates to a kind of municipal pipeline (1), regulating and storing device (2), more than one partition water supply pipe network (3) of vertical partitioning;The partition water supply pipe network (3) includes water inlet pipe (31), unequal amount of full variable frequency pump group (32), water outlet pipe (33), air pressure water tank (34), user pipe network (35);The full variable frequency pump group (32) includes pipeline parallel connection more than one same power's high-power main pump (321) with a small-power slave pump (322);The rated flow of the slave pump (322) is not less than the minimum flow value of the main pump (321) in high-efficiency operation interval, and the option of the slave pump (322) meets: in all pump types with rated flow not less than the minimum flow value, the pump type with the minimum difference value with the minimum flow value of the main pump (321) in high-efficiency operation interval is selected as slave pump preferentially;The water inlet pipe (31), the full variable frequency pump group (32), the water outlet pipe (33) are sequentially connected along water flow line of defense;The air pressure water tank (34) is equipped with tank body pressure sensor (341), and the air pressure water tank is connected to the water outlet pipe (33);The water inlet end pipe of the user pipe network (35) is connected to the water outlet end of the water outlet pipe (33);The near-end pressure sensor (351) is arranged at the most favorable water supply point of the user pipe network (35), and the distal-end pressure sensor (352) is arranged at the least favorable water supply point of the user pipe network;The municipal pipeline (1) is connected to the regulating and storing device (2);The water inlet end of the water inlet pipe (31) in the partition water supply pipe network (3) of low water supply area is connected to the water outlet end of the regulating and storing device (2), and the water inlet end of the water inlet pipe (31) in the partition water supply pipe network of relay networking is sequentially connected to the water outlet end of the water outlet pipe (33) below the partition water supply pipe network. The regulating and storing device (2) includes water tank (21), flow stabilizing tank (22);The water tank (21), the flow stabilizing tank (22) are connected to the water outlet end of the municipal pipeline (1) by water inlet connection pipe;The water inlet end of the water tank (21) is equipped with float ball valve (211);The water inlet connection pipe of the flow stabilizing tank (22) is sequentially equipped with water inlet pressure sensor (221), electric valve (222) along water flow direction;The water outlet end pipe of the water tank (21) is connected to the flow stabilizing tank (22), and the connecting pipe is sequentially equipped with water replenishing pump (212), water replenishing pressure sensor (213) along water flow direction;The water outlet end of the flow stabilizing tank (22) is connected to the water inlet pipe (31) of low area. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The relayable networking global monitoring gradient pressure regulating water supply system according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​

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