Universe monitoring partition variable flow water supply system

Abstract

A global monitoring partition variable flow water supply system comprises a municipal pipeline, a regulation and storage device, an unequal full variable frequency pump set, an air pressure water tank, a main pipe, two to three branch pipes and a user pipe network which are vertically partitioned, and one to two pressure reduction control devices. The user pipe network is provided with a tip pressure sensor; the user pipe network of the highest area is provided with a near-end pressure sensor; and the pressure reduction control device comprises a variable flow regulation control branch and a pressure reduction branch connected with the variable flow regulation control branch in parallel. According to the utility model, the pressurizing water supply equipment is simple, concentrated in arrangement and easy to maintain; the partition regulation and control device is simple and can be arranged in the pipeline shaft, so that the building area is saved; the variable-frequency water pump runs in a high-efficiency area in a non-small-flow period and is matched with the lowest pressure required by the most unfavorable point; the air pressure water tank is pressurized and replenished water in the early stage of the small-flow water using stage, the water storage capacity of the air pressure water tank is increased, the start-stop frequency and the operation time of the full-variable-frequency water pump in the small-flow time period are reduced, and energy conservation and high efficiency of the water supply system are achieved.

Description

Technical Field

[0001] The utility model relates to the field of secondary water supply, and particularly to a high-rise vertical zoning water supply system. Background Art

[0002] [[ID=⑧]]For high-rise buildings with relatively low user flow during peak periods, the method of pressure-reducing valve zoning water supply is often adopted. That is, the high zone is supplied with water by a water supply pump group, and pressure-reducing valves are set in the vertical zoning for the low zone or the middle zone to reduce the pressure and supply water. Its advantages are that the equipment is all at the bottom of the building and the layout is centralized. The disadvantage is that the water supply flow direction of each zone is to first lift the water supply to the highest point of the zone and then supply water downward in a self-flow form, resulting in large energy consumption; the low zone or the middle zone is controlled by a pressure-reducing valve, and the water pressure loss is large. The pneumatic water tank matching the water supply pump group in the system only solves the pressure fluctuation during the switching between the water pumps in each zone pump group and absorbs the system water hammer. In the current scheme, the effective volume does not exceed the water supply volume for 90 seconds (usually only 10 seconds) of power frequency operation. This causes the stop time of the working pump group for water supply to be too short during low-flow operation at night, the working pump group starts and stops frequently and does not operate in the efficient zone, or the working pump group does not stop for a long time even during low-flow periods and operates in a non-efficient zone, resulting in high energy consumption and easy damage to the equipment. Content of the Utility Model

[0003] To overcome the above defects, the purpose of the utility model is to propose a whole-region monitoring zoning variable-flow water supply system, including: a municipal pipeline, a storage device, an unequal number of fully variable-frequency pump groups, a pneumatic water tank, a main pipe, two to three branch pipes for vertical zoning connected to the user pipe network, and one to two pressure-reducing control devices;

[0004] The municipal pipeline, the storage device, and the fully variable-frequency pump group are sequentially connected by pipelines;

[0005] The fully variable-frequency pump group includes one or more main pumps and one slave pump connected in parallel; [[ID=②]]

[0006] The rated flow of the slave pump is not less than the minimum flow value of the main pump in the efficient operation range, and the selection of the slave pump meets the following: among all pump models with a rated flow not less than the minimum flow value, the pump model with the minimum difference from the minimum flow value of the main pump in the efficient operation range is preferentially selected as the slave pump;

[0007] The pneumatic water tank and the main pipe are respectively connected in parallel to the water outlet end of the fully variable-frequency pump group;

[0008] The tank body of the pneumatic water tank is provided with a tank body pressure sensor;

[0009] The water inlet ends of two to three branch pipes are connected in parallel to the main pipe;

[0010] The water inlet end of the user pipe network in the highest area is connected to the branch pipe;

[0011] The outlet of each user pipe network, except for the highest area, the pressure reducing control device, and the inlet of each branch pipe are connected in sequence.

[0012] A terminal pressure sensor is installed at the most unfavorable water supply point of the user pipeline network.

[0013] A near-end pressure sensor is installed at the most favorable water supply point of the user pipeline network in the highest zone.

[0014] The pressure reduction control device includes a variable flow rate regulation control branch;

[0015] The variable flow regulation and control branch is provided with a first electric valve, an intelligent regulating valve, and a first check valve in sequence along the water flow direction;

[0016] The intelligent regulating valve refers to a device that can precisely and quantitatively control the flow rate in a pipeline.

[0017] Methods for comprehensive monitoring of zoned variable flow water supply systems:

[0018] Parameter settings:

[0019] When the minimum required water supply pressure is Pmin, the minimum water supply pressure at the end of the pipe network of each vertical zone—that is, the most unfavorable water supply point—is Pmin.

[0020] When the maximum required water supply pressure is Pmax, the maximum water supply pressure at the nearest point of the pipe network in the highest zone—that is, the most favorable water supply point in the highest zone—is Pmax.

[0021] The rated flow rate of the main pump is Qmain, and the factory-set high-efficiency flow range of the main pump is α%~100% (α≤50).

[0022] The rated flow rate of the slave pump is Qsec. When selecting the slave pump, it is required that Qsec≥α%*Qmain. The factory setting value of the high efficiency flow range of the slave pump is β%~100% (β≤50).

[0023] The number of main pumps in the fully variable frequency pump set is M;

[0024] The real-time monitoring pressure value of the distal pressure sensor is Pfar;

[0025] The real-time monitoring pressure value of the proximal pressure sensor is Pclose;

[0026] The tank pressure sensor monitors the pressure in real time as Ppv;

[0027] I. Fully variable frequency pump sets are matched with the highest-power user pipeline network for low-power variable flow operation:

[0028] Only the monitoring values ​​of the terminal pressure sensor and the proximal pressure sensor in the water supply network of the highest zone are used to control the operation of the fully variable frequency pump set. The logical relationship between the monitoring values ​​of the terminal pressure sensor and the proximal pressure sensor and the operation of the fully variable frequency pump set is as follows:

[0029] To meet the user network water pressure setting requirements of the highest zone, the variable frequency pump set or the pressure tank needs to provide an instantaneous flow rate of Qout for the user network water supply;

[0030] Operating steps:

[0031] (1) Operation during periods of high traffic volume:

[0032] The criteria for identifying non-low flow periods are: Pfar = Pmin. When the sum of water intake from all the aforementioned zoned water supply networks changes in real time, causing 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 set. Rebalancing is achieved by dynamically adjusting the Pfar value. During this process, Qout > β% * Qsec.

[0033] During this period, it is required that, under the condition of real-time changes in user water consumption, the instantaneous flow rate of the fully variable frequency pump set be adjusted to meet Pfar=Pmin, that is, to provide the minimum compliant water supply pressure at the most unfavorable water supply point of the user pipeline network in the highest zone, so as to ensure the lowest energy consumption of the fully variable frequency pump set; the operating logic of the main pump and the slave pump in the fully variable frequency pump set is as follows:

[0034] 1) When β%*Qsec<Qout≤Qsec;

[0035] The main pumps are all shut down; the flow output requirements of the full-frequency pump group are met by adjusting the instantaneous flow rate of the slave pumps. That is, the output at the flow threshold can be achieved by adjusting the instantaneous flow rate of the slave pumps, and the slave pumps always operate in the high-efficiency range.

[0036] 2) When Qsec < Qout ≤ M * Qmain;

[0037] The slave pump is shut down; the number of main pumps turned on is ⌈Qout / Qmain⌉ and is adjusted in real time. The instantaneous flow rate output by each main pump is the same, which is Qout / ⌈Qout / Qmain⌉. That is, the output at this flow rate threshold can be achieved by adjusting the number of main pumps turned on and the output flow rate of each main pump. The turned-on main pumps always operate in the high-efficiency range.

[0038] 3) When M*Qmain<Qout≤M*Qmain+β%*Qsec

[0039] The instantaneous flow rate of the slave pump is β%*Qsec; all the main pumps are turned on and adjusted in real time. The instantaneous flow rate output by each main pump is the same, which is (Qout-β%*Qsec) / M. That is, when the flow rate threshold is output, the slave pump operates at a constant instantaneous flow rate in the high-efficiency zone. The instantaneous flow rate required for Qout can be achieved by adjusting the instantaneous flow rate of the main pump. At this time, the main pump also always operates in the high-efficiency zone.

[0040] 4) When M*Qmain+β%*Qsec<Qout≤M*Qmain+Qsec, all the main pumps are turned on, and the instantaneous flow rate of each main pump is the same, which is Qmain; the slave pumps adjust the flow rate in real time to meet the changing flow output requirements of the full variable frequency pump group. At this time, all the main pumps are operating in the high-efficiency zone—rated flow rate; the slave pumps adjust the flow rate in real time to meet the changing flow output requirements of the full variable frequency pump group. At this time, the instantaneous flow rate of the slave pumps is greater than β%*Qsec, and they are also operating in the high-efficiency zone.

[0041] (2) Operate during periods of low traffic volume:

[0042] The low-flow period is the period when Qout ≤ β% * Qsec; that is, during the operation of the step; when in order to satisfy Pfar = Pmin, the instantaneous flow rate of the user's pipeline water supply needs to be Qout ≤ β% * Qsec, which means that the instantaneous flow rate of the full variable frequency pump set will be lower than the lower limit of the flow output threshold of the pump's high efficiency zone, the energy consumption of the full variable frequency pump set for water supply is high, so the low-flow scheme is adopted and the operation is switched to this step;

[0043] Operating steps:

[0044] 1) During the transition from a non-low flow period to a low flow period, the instantaneous flow rate of the full variable frequency pump group is dynamically adjusted so that Pclose = Pmax; the main pump and the slave pump in the full variable frequency pump group operate in the same way as in step (1). During this process, as the water supply pressure increases, the excess output water enters the pressure tank, and the water storage capacity of the pressure tank increases continuously. That is, during the process of increasing the instantaneous flow rate of the full variable frequency pump group in this step, the water supply pressure increases synchronously. According to Boyle Mario, this process pressurizes the pressure tank, and the water storage capacity of the pressure tank also increases synchronously. The purpose of this process is to adjust the water pressure of the user network in the highest area to the upper limit of the water pressure required by the local government for the user network, so that the pressure tank can replenish the maximum allowable water capacity, so as to extend the water supply time of the pressure tank to all the user networks as much as possible, thereby extending the downtime of the full variable frequency pump after switching to water supply from the pressure tank during the low flow period to save energy.

[0045] 2) After Pclose=Pmax, Ppv is monitored and the rate of increase, i.e., ΔPpv value, is calculated until ΔPpv=0, i.e. Ppv reaches its peak value. At the same time, the pressure tank reaches the peak value of the water storage within the permissible range, and the full variable frequency pump set stops running.

[0046] 3) The air bladder in the pressure tank is compressed and gradually shrinks and drains water outward to supply water to the outside, while monitoring the Pfar value;

[0047] 4) During the previous step, the Pfar monitoring value gradually decreases. When Pfar = Pmin, switch to the non-low flow period operation step.

[0048] II. Low-power variable-flow operation of the pipeline network for users outside the highest-voltage zone:

[0049] Since the head of the fully variable frequency water supply pump set meets the water usage requirements of the highest-level user network, the upper limit of water intake from the main pipe by other non-highest-level user networks must meet the head requirements of their respective user networks.

[0050] The operational logic for water intake from the user network in non-maximum zones to the main pipeline is as follows:

[0051] When the first electric valve is opened, the intelligent regulating valve dynamically adjusts the flow rate and draws water from the main pipe in real time as needed to match the corresponding user network Pfar=Pmin, thereby saving the output power of the full variable frequency pump set and achieving energy saving.

[0052] When the intelligent regulating valve cannot be controlled to dynamically adjust the flow rate to match Pfar=Pmin, the intelligent regulating valve is damaged. At this time, the corresponding first electric valve is closed and maintenance is pending; thus, the water supply to other user networks is not affected.

[0053] The advantages of operating in the above manner are:

[0054] (1) When the operation is not in the low flow area, the full variable frequency pump set operates in the high efficiency area, and the water flow of the full variable frequency pump set meets the minimum pressure of the highest zone water supply network terminal. Other zones also dynamically take water in real time according to the minimum flow to achieve the lowest energy consumption.

[0055] (2) Due to the low power slave pump, the small flow range is small, and the high efficiency operating range of the full frequency conversion pump set is increased;

[0056] (3) Before switching to low flow operation, the process of "the full variable frequency pump set increases the instantaneous flow and pressurizes the pressure tank to replenish water" is added, which greatly increases the water storage and energy storage of the pressure tank. After the full variable frequency pump set stops, the water supply time of the pressure tank during the low flow period at night is greatly increased, and the full variable frequency pump set can be dormant for a long time, avoiding the frequent start and stop of the full variable frequency pump set or the long-term operation in the inefficient area.

[0057] (4) The operation of the full frequency conversion pump set only needs to match the pressure sensor monitoring value of the user pipeline network in the highest zone, without having to consider the pressure sensor monitoring value of other zones;

[0058] (5) The system is equipped with only one set of fully variable frequency pumps, which greatly simplifies the equipment usage and occupies less space.

[0059] To provide a backup branch in case the variable flow rate regulation control branch is damaged, the pressure reducing control device also includes a pressure reducing branch connected in parallel with the variable flow rate regulation control branch.

[0060] The pressure-reducing branch is provided with a second electric valve, a pressure-reducing valve, and a second check valve in sequence along the water flow direction.

[0061] When the intelligent regulating valve is damaged, the corresponding first electric valve closes and the second electric valve opens, and the pressure reducing valve provides a passage to supply water to the user's pipe network. The pressure reducing valve is preset with a flow rate that matches the flow rate at the most unfavorable water supply point during peak water usage periods, which meets the minimum water pressure required by the local government. This method ensures that the user's pipe network can still supply water after the intelligent regulating valve is damaged, thus achieving water supply continuity.

[0062] When the water flow from the municipal pipeline is sufficient but the pressure is insufficient, the regulating device is a flow stabilizing tank.

[0063] Considering space saving and quiet operation, both the main pump and the slave pump are in-line pumps.

[0064] The advantages and positive effects of this utility model are: the booster water supply equipment is simple, centrally arranged, and easy to maintain; the zone control device is simple and can be arranged in the pipeline shaft, saving building area; during non-low flow periods, the variable frequency water pumps operate in the high-efficiency zone and are matched with the minimum pressure required at the most unfavorable point; the pressure tank pressurizes and replenishes water in the early stage of low flow water use, and the water storage capacity of the pressure tank increases, which greatly reduces the number of start-stop cycles and the running time of the full variable frequency water pump during low flow periods, thereby achieving energy-saving and high-efficiency water supply system. Attached Figure Description

[0065] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0066] Figure 1 This is a schematic diagram of the whole-area monitoring zoned variable flow water supply system of this utility model;

[0067] Figure 2 for Figure 1 Enlarged view of the medium-pressure reduction control device.

[0068] In the diagram, the following components are included: municipal pipeline-1, storage device-2, variable frequency pump set-3, main pump-31, slave pump-32, pressure tank-4, tank pressure sensor-41, main pipe-5, branch pipe-6, pressure reducing control device-7, variable flow regulation control branch-71, first electric valve-711, intelligent regulating valve-712, first check valve-713, pressure reducing branch-72. Along the water flow direction, the following components are sequentially installed: second electric valve-721, pressure reducing valve-722, second check valve-723, user pipeline-8, near-end pressure sensor-81, and terminal pressure sensor-82. Detailed Implementation

[0069] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0070] like Figure 1 As shown, Example 1:

[0071] A full-area monitoring zoned variable flow water supply system includes: municipal pipeline 1, storage device 2, variable frequency pump sets of varying quantities 3, pressure tank 4, main pipe 5, two to three branch pipes 6 of vertical zones and user network 8, and one to two pressure reducing control devices 7.

[0072] Storage device 2 is a flow stabilizing tank 21;

[0073] Municipal pipeline 1, flow stabilizing tank 21, and full variable frequency pump set 3 are connected in sequence;

[0074] The fully variable frequency pump set 3 includes one or more main pumps 31 connected in parallel and one slave pump 32;

[0075] Both the main pump 31 and the slave pump 32 are in-line pumps;

[0076] The rated flow of the slave pump 32 is not less than the minimum flow value of the main pump 31 in the high-efficiency operating range, and the selection of the slave pump 32 satisfies the following: among all pump types with a rated flow not less than the minimum flow value, the pump type with the minimum difference between the rated flow and the minimum flow value of the main pump 31 in the high-efficiency operating range is preferentially selected as the slave pump.

[0077] The air pressure water tank 4 and the main pipe 5 are respectively connected to the outlet of the full variable frequency pump set 3;

[0078] The pressure tank 4 is equipped with a tank pressure sensor 41;

[0079] Two to three branch pipes 6 are connected to the main pipe 5 at their water inlet ends;

[0080] The inlet of user network 8, located in the highest area, is connected to branch pipe 6;

[0081] Except for the highest area, the outlet of each user's pipe network 8, the pressure reducing control device 7, and the inlet of the branch pipe 6 are connected in sequence.

[0082] A terminal pressure sensor 82 is installed at the most unfavorable water supply point in the user's pipeline network 8.

[0083] A near-end pressure sensor 81 is installed at the most favorable water supply point of the user pipeline network 8 in the highest zone;

[0084] The pressure reducing control device 7 includes a variable flow rate regulation control branch 71 and a pressure reducing branch 72 connected in parallel with the variable flow rate regulation control branch 71.

[0085] The pressure-reducing branch 72 is provided with a second electric valve 721, a pressure-reducing valve 722, and a second check valve 723 in sequence along the water flow direction.

[0086] The variable flow regulation control branch 71 is provided with a first electric valve 711, an intelligent regulating valve 712, and a first check valve 713 in sequence along the water flow direction.

[0087] The present invention has been described in detail above through embodiments, but the content is only a preferred embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A global monitoring zonal variable flow water distribution system, characterized in that, The utility model relates to a kind of municipal pipeline systems, comprising: Municipal pipeline (1), regulating and storing device (2), unequal amount of full variable frequency pump set (3), air pressure water tank (4), dry pipe (5), two to three branch pipes (6) vertically partitioned with user pipe network (8), one to two pressure reducing control devices (7); The municipal pipeline (1), the regulating and storing device (2), the full variable frequency pump set (3) are sequentially connected by pipeline; The full variable frequency pump set (3) comprises one or more than one main pump (31) and a slave pump (32) in parallel connection; The rated flow of the slave pump (32) is not less than the minimum flow value of the main pump (31) in the high-efficiency operating interval, and the options of the slave pump (32) satisfy that, in all pump types with rated flow not less than the minimum flow value, the pump type with the smallest difference from the minimum flow value of the main pump (31) in the high-efficiency operating interval is selected as the slave pump; The air pressure water tank (4) and the dry pipe (5) are connected to the water outlet end of the full variable frequency pump set (3) respectively; The tank body of the air pressure water tank (4) is provided with a tank body pressure sensor (41); Two to three branch pipes (6) are connected to the water inlet end of the dry pipe (5); The water inlet end of the user pipe network (8) in the highest area is connected to the branch pipe (6); The water outlet end of each user pipe network (8) except the highest area, the pressure reducing control device (7) and the water inlet end of the branch pipe (6) are sequentially connected; A distal pressure sensor (82) is arranged at the most unfavorable water supply point of the user pipe network (8); A proximal pressure sensor (81) is arranged at the most favorable water supply point of the user pipe network (8) in the highest area. The pressure reducing control device (7) comprises a variable flow regulating control branch (71). The variable flow regulating control branch (71) is sequentially provided with a first electric valve (711), an intelligent regulating valve (712) and a first check valve (713) in the water flow direction. The intelligent regulating valve (712) is a device capable of accurately controlling the flow of the pipeline.

2. The full range monitored zonal variable volume water distribution system according to claim 1, wherein, The pressure reducing control device (7) further comprises a pressure reducing branch (72) connected to the variable flow regulating control branch (71). The pressure reducing branch (72) is sequentially provided with a second electric valve (721), a pressure reducing valve (722) and a second check valve (723) in the water flow direction.

3. A full range monitored zonal variable volume water distribution system according to claim 1 or 2, characterised in that, The regulating and storing device (2) is a steady flow tank (21).

4. The full range monitored zonal variable volume water distribution system according to claim 3, wherein: The main pump (31) and the slave pump (32) are both in-pipe pumps.

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