CN104674894A - Partition water supply system and method - Google Patents

Abstract

The present disclosure provides a water supply system and a water supply method for district water supply. The water supply system at least includes: a first water pump group; a second water pump group, which is connected in series with the first water pump group and utilizes the second rich head of the water supply of the first water pump group to superimpose water supply; the first and second Water outlet flow sensors, which are respectively connected to the water outlet ends of the first and second water pump groups, for respectively detecting the first and second water outlet flows of the water supply of the first and second water pump groups; and the control cabinet, respectively connected to the first water pump group, the second water pump group, the first water outlet flow sensor and the second water outlet flow sensor, and based on the detected first water outlet flow and/or second water outlet flow, to control the corresponding work of different water pump configuration parameters (Q, H) in the first water pump group and/or the second water pump group.

Description

Water supply system and method for districted water supply

technical field

The present disclosure generally relates to the field of urban building water supply, and more particularly relates to a water supply system and method for district water supply.

Background technique

In people's daily production and life, it is inevitable to use various water resources. Therefore, the urban water supply system has become an important part of daily production and life. In the current urban water supply system, especially in the water supply system of middle and high-rise buildings, water supply mainly adopts vertical multi-stage pump reservoir type water supply equipment and/or non-negative pressure water supply equipment and the like for water supply.

In the traditional vertical multi-stage pump reservoir-type water supply equipment, generally more than one vertical multi-stage pump is combined in parallel to realize the mutual backup relationship between the pumps, and each pump draws water through the 24-hour reservoir for the corresponding area water supply. This kind of water supply method has the highest energy consumption because it does not utilize the residual pressure of the municipal water supply network. If the district water supply design is adopted for high-rise buildings, each district needs to be equipped with a set of secondary water supply equipment during project construction. Because the water supply of each district is independent and has no correlation, in the process of constant pressure water supply in each district, in order to ensure a constant water outlet pressure, the water pump has a long-term constant pressure corresponding to the lift work, which caused a lot of basic energy consumption loss. In addition, since high-rise buildings are supplied with water in different areas, the water pumps in each area are independent of each other, and the system also needs to be equipped with reservoirs, etc., so it occupies the largest area.

In addition, in the traditional non-negative pressure water supply equipment, a set of non-negative pressure water supply equipment is responsible for the water supply of the corresponding area. The system generally consists of one or more water pumps connected in parallel to achieve mutual water supply. The water inlet end of the water pump directly connects with the inlet pipe of the municipal water supply network and superimposes pressure conversion. The advantage of this water supply equipment is that it always directly utilizes the residual pressure of the municipal pipe network, which can save energy by about 25% compared with the above-mentioned reservoir pump water supply method. The disadvantage is that this equipment can only be used in small and medium-sized cities where the municipal main network is rich enough to supply water, but not in central cities (the use of equipment has relatively large limitations).

Similarly, if the district water supply design is adopted for high-rise buildings, each district needs to be equipped with a set of secondary water supply equipment during project construction, and the water supply for each district is independent without any correlation. In other words, in the process of constant pressure water supply in each district, in order to ensure a constant outlet water pressure, the water pumps have long-term constant pressure corresponding to the head work, resulting in the loss of basic energy consumption. In addition, because most high-rise buildings use district water supply, the water pump units in each district are independent of each other, so the water pump units also occupy a large area.

Contents of the invention

In order to solve or at least alleviate the above-mentioned problems, a water supply system and method for district water supply according to embodiments of the present disclosure are provided.

According to a first aspect of the present disclosure, a water supply system for district water supply is provided. The water supply system at least includes: a first water pump group, which is connected to the municipal water supply network or a pool tank, and utilizes the first rich head of the water supply of the municipal water supply network to superimpose water supply; the first water flow sensor, which is connected to To the water outlet end of the first water pump group, used to detect the first water outlet flow rate of the water supply of the first water pump group; the second water pump group, which is connected in series with the first water pump group and utilizes the first water pump group The existing lift and surplus flow of the water supply to provide the required flow of superimposed water supply; the second water outlet flow sensor, which is connected to the water outlet of the second water pump group, is used to detect the water supply of the second water pump group The second water outlet flow rate; and the control cabinet, respectively connected to the first water pump group, the second water pump group, the first water outlet flow sensor and the second water outlet flow sensor, and based on the detected first The water outlet flow rate and/or the second water outlet flow rate are used to control the configuration parameters of different water pumps in the first water pump group and/or the second water pump group to operate at the best working efficiency.

In some embodiments, the water supply system further includes: a third water pump group, which is connected in series with the second water pump group and uses the existing head and surplus flow of the water supply of the second water pump group to provide the required flow rate. Superimposed water supply; a third water outlet flow sensor, which is connected to the water outlet end of the third water pump group and used to detect the third water outlet flow rate of the water supply of the third water pump group, wherein the control cabinet is also connected to the water outlet respectively The third water pump group is connected to the third water outlet flow sensor, and based on the detected first water outlet flow, second water outlet flow and/or third water outlet flow, the first water pump group and the first water outlet flow are controlled. The configuration parameters of different water pumps in the second water pump group and/or the third water pump group are used to operate at the best working efficiency.

In some embodiments, all pump sets are located in the same equipment room.

In some embodiments, the control cabinet controls each water pump group according to the following formula: W=W _min +ΔW ₁ +ΔW ₂ , where W represents the unit power consumption value of the water pump group, and W _min represents the minimum unit of the water pump group The power consumption value, ΔW ₁ represents the additional unit power consumption value caused by the actual operating efficiency of the water pump group deviating from the maximum efficiency, and ΔW ₂ represents the additional unit power consumption value caused by the actual operation of the water pump group with a rich head, wherein the control The cabinet controls each pump set to minimize ΔW ₁ +ΔW ₂ .

In some embodiments, Among them, Q represents the total flow of the water pump group, t represents the time, H (Q, t) represents the total lift actually provided by the water supply system under the working condition (Q, t), and η (Q, H) represents the water pump group in The overall operating efficiency under the working condition (Q, H), _Htotal (Q, t) represents the desired total head of the water supply system under the working condition (Q, t), and η _max (Q, H) represents the water pump group in The highest efficiency under working conditions (Q, H), Δη(Q, H) represents the efficiency deviation between η(Q, H) and η _max (Q, H), ΔH(Q, t) represents H(Q, t) and the difference between _Htotal (Q, t).

In some embodiments, each water pump group consists of one or more SUS304 stainless steel pumps, one or more stop valves and one or more butterfly valves corresponding to each SUS304 stainless steel pump.

In some embodiments, the water supply system further includes: a first temperature sensor connected to the first water pump group and the control cabinet for detecting the water temperature of the first water pump group; and a first over-temperature sensor A drain solenoid valve, which is connected to the first water pump set and the control cabinet, and is used for draining water when the first temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to prevent the first water pump set from Hot and reduce the service life.

In some embodiments, the water supply system further includes: a second temperature sensor connected to the second water pump group and the control cabinet for detecting the water temperature of the second water pump group; and a second over-temperature sensor A drain solenoid valve, connected to the second water pump set and the control cabinet, for draining water when the second temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to prevent the second water pump set from Hot and reduce the service life.

In some embodiments, the water supply system further includes: a first pressure sensor connected to the water outlet end of the first water pump group to measure the first water outlet pressure of the first water pump group; and a second pressure A sensor, which is connected to the water outlet end of the second water pump group to measure the second water outlet pressure of the second water pump group, wherein the control cabinet is also based on the first water outlet pressure and/or the second water outlet pressure. The water outlet pressure is used to control the working power of each water pump group.

According to a second aspect of the present disclosure, a method for district water supply is provided. The method includes: controlling a first water pump set connected to a municipal water supply network or a pool tank to utilize a first rich head of the water supply of the municipal water supply network to superimpose the water supply; using a pump connected to the first water pump set The first water outlet flow sensor at the water outlet is used to detect the first water outlet flow rate of the water supply of the first water pump group; the second water pump group connected in series with the first water pump group is controlled to use the first water supply flow rate of the first water pump group Superimpose the water supply with two rich lifts; use the second water outlet flow sensor connected to the water outlet end of the second water pump group to detect the second water outlet flow rate of the water supply of the second water pump group; and based on the detected first water outlet The flow rate and/or the second water outlet flow rate are used to control the working power of the water pumps in the first water pump group and/or the second water pump group.

In some embodiments, the method further includes: controlling a third water pump group connected in series with the second water pump group to use the third rich head of the water supply of the second water pump group to superimpose the water supply; The third water outlet flow sensor at the water outlet end of the third water pump group detects the third water outlet flow rate of the water supply of the third water pump group; and based on the detected first water outlet flow rate, second water outlet volume and/or third The outlet water flow rate is used to control the working power of the first water pump group, the second water pump group and/or the third water pump group.

In some embodiments, all pump sets are located in the same equipment room.

In some embodiments, each water pump group is controlled according to the following formula: W=W _min +ΔW ₁ +ΔW ₂ , where W represents the unit power consumption value of the water pump group, W _min represents the minimum unit power consumption value of the water pump group, ΔW ₁ represents the additional unit power consumption value caused by the actual operating efficiency of the water pump group deviating from the maximum efficiency, and ΔW ₂ represents the additional unit power consumption value caused by the actual operation of the water pump group with a rich lift, where each water pump group is controlled to be the minimum ΔW ₁ +ΔW ₂ .

In some embodiments, Among them, Q represents the total flow of the water pump group, t represents the time, H (Q, t) represents the total lift actually provided by the water supply system under the working condition (Q, t), and η (Q, H) represents the water pump group in The overall operating efficiency under the working condition (Q, H), _Htotal (Q, t) represents the desired total head of the water supply system under the working condition (Q, t), and η _max (Q, H) represents the water pump group in The highest efficiency under working conditions (Q, H), Δη(Q, H) represents the efficiency deviation between η(Q, H) and η _max (Q, H), ΔH(Q, t) represents H(Q, t) and the difference between _Htotal (Q, t).

In some embodiments, each water pump group consists of one or more SUS304 stainless steel pumps, one or more stop valves and one or more butterfly valves corresponding to each SUS304 stainless steel pump.

In some embodiments, the method further includes: using a first temperature sensor connected to the first water pump group to detect the water temperature of the first water pump group; and controlling the first water pump connected to the first water pump group. The over-temperature drain solenoid valve is used to drain water when the first temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to avoid reducing the service life of the first water pump set due to overheating.

In some embodiments, the method further includes: using a second temperature sensor connected to the second water pump group to detect the water temperature of the second water pump group; and controlling the second temperature sensor connected to the second water pump group The over-temperature drain solenoid valve is used to drain water when the second temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to prevent the second water pump group from reducing its service life due to overheating.

In some embodiments, the method further includes: using a first pressure sensor connected to the water outlet end of the first water pump group to measure the first water outlet pressure of the first water pump group; using a pressure sensor connected to the second water pump The second pressure sensor at the water outlet end of the group measures the second water outlet pressure of the second water pump group; and also controls the working power of each water pump group according to the first water outlet pressure and/or the second water outlet pressure.

By using the water supply system and method of the present disclosure, it is possible to solve the problem of high energy consumption of traditional storage pumps and non-negative pressure secondary water supply complete sets of equipment, to solve the problem that the traditional secondary water supply equipment does not protect the water pump from overheating, and to solve the problem that the traditional secondary water supply equipment does not introduce Precise control of water flow improves the high-efficiency point of the pump, and solves the problem of difficult maintenance and large area occupation of traditional secondary water supply equipment.

Specifically, the water supply system according to the embodiments of the present disclosure can realize the purpose of water supply in high-level districts through the channeling combined structure of the independent water supply pumps for water supply in different districts through the principle of layer-by-layer stacking pressure, so as to save the lift in the low-area when realizing the water supply in the middle area. The purpose of saving the head of the middle area when supplying water to the high area and the high area, and then realizing the purpose of energy saving.

In addition, intelligent water supply is realized through the detection of the outlet water flow in each area and the precise calculation and control of the pumps with different rated flow power in each area by the central processor in the control cabinet. Its purpose is to calculate and find the working state of the pump corresponding to the maximum efficiency point and the minimum head of each pump under different water flow conditions. The purpose is to strictly control the low efficiency and head waste caused by unreasonable configuration and operation, and realize the purpose of energy saving.

In addition, because the water supply pumps used for high-rise district water supply (for example, more than 2 districts) are designed on the basis of occupying the usable area of one district, the water pumps are superimposed in the air, so that multiple districts can occupy the location of a set of equipment, and do it at the same time. To achieve the purpose of district water supply. Here, the aerial stacking design generally refers to the low-pressure pump set as the starting point, the mid-zone pump set is stacked on the low-zone pump set through supports, and so on. Therefore, a high degree of device integration is achieved, and the floor space is saved.

Description of drawings

The above-mentioned and other objects, features and advantages of the present disclosure will be made clearer by describing preferred embodiments of the present disclosure below in conjunction with the accompanying drawings, wherein:

FIG. 1 is an exemplary schematic diagram illustrating a water supply system for district water supply according to an embodiment of the present disclosure.

FIG. 2 is a schematic diagram illustrating an example stacked water supply energy saving according to an embodiment of the present disclosure.

FIG. 3 is a flowchart illustrating an example water supply control method performed at a control cabinet according to an embodiment of the present disclosure.

Detailed ways

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, and unnecessary details and functions for the present disclosure will be omitted during the description to avoid confusing the understanding of the present disclosure. It should be understood that: the following descriptions are only used to completely, clearly and comprehensively understand the essential creative concepts of the present invention, so that those skilled in the art can realize the embodiments of the present disclosure, and they should not be regarded as limiting the protection scope of the present invention .

Furthermore, although different technical features may be described in different embodiments, this does not mean that these technical features cannot be used in combination. In fact, in the absence of explicit contrary records, it should be considered that these technical features and even different technical solutions can be used in combination to benefit.

In addition, in the present disclosure, the use of terms such as "first", "second", "third", etc. are only used to distinguish different elements with the same name, and should not be regarded as having different priorities for these different elements. level or sequence. For example, the "first water pump group" does not necessarily have priority over the "second water pump group", or the "first water pump group" does not necessarily have to have the "second water pump group", etc. Similarly, the "first water outlet flow" is not necessarily greater than, less than or equal to the "second water outlet flow", and the relationship between them is not limited by "first" or "second".

Next, the inventive principle according to the embodiment of the present disclosure will be briefly described.

For the water pump (group), it should satisfy the following formula:

Pump power * pump efficiency = head * flow * density * acceleration of gravity

Among them, generally speaking, the unit of power is "kilowatt", the unit of efficiency is "meter", the unit of flow is " ^m3 /s", the unit of density is "kg/ ^m3 ", and the unit of gravity acceleration The unit is "m/ ^s2 " or "N/kg". Of course, the present invention is not limited thereto, and other unit systems may also be used. In addition, the left side of the formula is equivalent to the effective power of the water pump. The above formula is equivalently deformed and converted into common units in this field, that is, the following formula is obtained:

$\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; \&ap;</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 367</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&eta;</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, W is the unit power consumption value of the pump (group) (unit is kWh/cubic meter), Q is the flow rate (unit is " ^m3 /s"), and H(Q, t) is the working time of the pump (group). The total head (in meters) provided under condition (Q, t), η(Q, H) is the overall operating efficiency of the pump (group) (generally expressed as a percentage). In addition, considering that tap water has a density of 1000 kg/ ^m3 under normal (simplified) conditions, an acceleration of gravity of 9.8 N/kg, and converting seconds into hours, formula (1) can be obtained.

Please note that H(Q, t) is generally a function of flow Q and time t, and its size is related to the technological requirements of the water supply pipeline and the adjustment ability of the water pump (group). η(Q, H) is a function of flow Q and head H(Q, t). In one embodiment, the calculation formula of η (Q, H) can be as follows:

η(Q, H) = η ₁ (Q, H)×η ₂ (Q, H)×η ₃ (Q, H) (2)

In formula (2), η ₁ (Q, H) represents the operating efficiency of the water pump (group), η ₂ (Q, H) is the operating efficiency of the water pump motor, and η ₃ (Q, H) is the operating efficiency of the water pump speed control device η ₁ (Q, H), η ₂ (Q, H) and η ₃ (Q, H) are all functions of the pump flow Q and head H (Q, t), and they also vary with the pump flow Q and head H (Q, t) changes. Please note: For simplicity of description, the efficiency of the hardware itself, such as water pumps and motor couplings, is omitted here.

Assuming that the total head required by the secondary water supply process is H _total (Q, t), and the total head provided by the water pump is H (Q, t), the wasted head is ΔH (Q, t), as shown in the following formula:

ΔH (Q, t) = H (Q, t) - H _total (Q, t) (3)

The overall efficiency η(Q, H) of the pump changes with the flow Q and the rated pump head H(Q, t). For a given working condition (Q, H), different adjustment methods can be adopted in the pump equipment Among them, there is an operation mode with the best overall efficiency, at this time, the pump (group) has the maximum efficiency value, which can be recorded as η _max (Q, H). In some embodiments, the η _max (Q, H) is not the product of the highest efficiencies of all constituent devices. It generally refers to the highest efficiency that can be achieved by using all possible adjustment means corresponding to the working condition (Q, H). In some embodiments, it is a constrained adjusted maximum. In addition, the difference between the actual overall operating efficiency of the pump (group) η(Q, H) and the maximum efficiency η _max (Q, H) can be called the efficiency deviation Δη(Q, H):

Δη(Q, H)=η _max (Q, H)-η(Q, H) (4)

Then the unit power consumption expression (1) of the water pump (group) becomes:

W＝W _min +ΔW ₁ +ΔW ₂ (5)

Among them, W _min represents the minimum unit power consumption value of the water pump group, ΔW ₁ represents the additional unit power consumption value caused by the actual operation efficiency of the water pump group deviating from the maximum efficiency, and ΔW ₂ represents the additional unit power consumption value caused by the actual operation of the water pump group with a rich head. Unit power consumption value.

More specifically, in one embodiment, in formula (5), as well as ${\mathrm{\&Delta;W}}_2=\left\{\frac{\mathrm{\&Delta;H}(Q,t)}{367\&times;{\mathrm{\&eta;}}_{\max }(Q,h)}\right\}.$

The first part W _min in formula (5) represents the minimum energy consumption per ton of water that the water pump (group) can achieve, which is also the target power consumption that the control cabinet should pursue when adjusting each water pump group. ΔW ₁ +ΔW ₂ in the formula (5) represents the energy-saving potential of the water pump (group) under the current working conditions. On the negative side, it is also the water and electricity consumption per ton wasted by the water pump (group), which is recorded as ΔW:

ΔW＝ΔW ₁ +ΔW ₂ (6)

As mentioned above, the first part ΔW ₁ in formula (6) is the power saving potential caused by the deviation of efficiency Δη(Q,H) from the pump operating efficiency η(Q,H) which deviates from the maximum efficiency η _max (Q,H) (or waste of electric energy), and the second part is caused by the existence of a rich head ΔH (Q, t) in the pump.

More generally, the detected water supply flow can be fed back to the central control unit (for example, a control cabinet) in real time, and the corresponding water pump work can be found by modeling in the central control unit program according to the set corresponding water pump operating condition curve characteristics. It can reach the maximum efficiency point and the minimum head of the corresponding pump. For example, for a pump with a flow rate Q=30m ³ /hour and a rated head H=42m, according to its pump characteristic curve, when the pump head H increases, the rated flow rate Q of the pump will decrease, and its flow rate will decrease from Q=30m ³ /hour to When the flow rate is 0, the head H of the pump can range from 42m to 65m. In this case, it can be concluded that when the outlet flow of the water pump changes dynamically, the head of the water pump also changes dynamically. The purpose of the system to optimize the high-efficiency point of each pump is to control the pump to work within the range of the high-efficiency point in its own characteristic curve. The specific control of the high-efficiency point of the pump can be determined according to the pump model selection. After the pump is selected, the high-efficiency point value of each pump can be modeled in the central controller program, and the dynamic data of the pump flow can be collected by the program, compared with the modeling setting in the central controller program, and the corresponding pump parameters can be dynamically switched. . Therefore, in some embodiments, a fixed efficiency reference value is usually not preset, but is dynamically adjusted according to the actual situation through the man-machine dialogue window configured by the control system. For the specific adjustment method, please refer to the above formula and the following description. Of course, in some other embodiments, a reference experience value can also be given, for example, it is appropriate to ensure that the maximum efficiency adjustment range of the water pump is within plus or minus 15% of the water pump's rated flow value according to the water pump curve.

Therefore, the inventive idea of the present disclosure provides an energy-saving technology for achieving the lowest power consumption (and the target power consumption) for pumping water through a superposition method from low to high under the condition of meeting the water supply process requirements of each zone. Its theoretical basis is: in any water delivery system, there is a minimum value of unit power consumption (kWh/m ³ ) corresponding to the system operating conditions (system operating parameters). Using the intelligent stacking technology of water pumps, for example, the power saving potential (or power waste) caused by optimizing the efficiency deviation Δη(Q, H) and/or the power saving caused by optimizing the rich head ΔH(Q, t) of the water pump (group) potential (or power waste). In some embodiments, the "efficiency deviation" is always given priority when adjusting, because the affluent head of the water pump mainly refers to the affluence of the physical head that must be higher than the actual process head during the selection of the water pump. Therefore, the affluent head is secondary. Of course, the present invention is not limited thereto, and adjustments may also be made according to other priority orders, such as prioritizing "rich lift" or any other combination of factors.

Fig. 1 shows a schematic schematic diagram of a water supply system according to an embodiment of the present disclosure. The water supply system realizes the water supply in the middle zone by connecting the water pumps in the middle zone directly in series with the water pumps in the low zone, and the series connection directly saves the wealth in the low zone. The head ΔH _{is low} (Q, t); and the water pump group in the high area is directly connected in series with the pump group in the middle area to realize the water supply in the high area. This series connection directly saves the rich head ΔH _in the middle area (Q, t). Therefore, using the water supply system minimizes the unit power consumption during the system's operation during the water delivery process. In this way, the power consumption of the operation of the water delivery system can be minimized, and at the same time, the maximum power saving and energy-saving benefits can be obtained, and the economical operation of the water delivery system can be realized.

In the embodiment shown in FIG. 1 , the water supply system may include multiple sets of water pumps, and supply water to different zones. In some embodiments, each water pump group may include one or more water pumps, one or more stop valves and one or more butterfly valves corresponding to each water pump. In some embodiments, the shut-off valve can be arranged at the water outlet of each water pump, and its function is to ensure that during the water supply process of a group of water pumps, when any one or more pumps are working, other non-working pumps will not Backwater is generated, which does not form an internal circulation, so as to ensure that the water pump always does effective work. In some embodiments, butterfly valves can be arranged at the water inlet and/or water outlet of each water pump. In one or more embodiments, the butterfly valve may be a manual butterfly valve. The function of the butterfly valve is to cut off the water source when the water pump is overhauled or repaired, so as to facilitate the maintenance of the faulty water pump without stopping the water supply of the entire system.

More specifically, in the embodiment shown in Fig. 1, the water supply system includes three water pump groups, respectively to the first zone (low zone 6), the second zone (middle zone 10) and the third zone (high zone 12) water supply. In some embodiments, the water supply pressure of the low zone can be in the range of 3.5-5Kg, the water supply pressure of the middle zone can be in the range of 7.0-9.0Kg, and the water supply pressure of the high zone can be in the range of 10.0-13.0Kg. Of course, those skilled in the art should understand that the present invention is not limited thereto. In other embodiments, the water supply pressure of each zone is not limited to the above numerical range.

In the embodiment shown in Figure 1, each water pump group can include two individual water pumps 2, 8 and/or 11 (for example, SUS304 stainless steel sink pump), and each individual water pump can be connected to a municipal water supply pipeline or a pool Water tank pipeline 1 or the upper water pump group. In addition, each water pump is connected with a shut-off valve before and after (water inlet and water outlet), as shown in Figure 1, and a butterfly valve is also connected behind each water pump (water outlet). The use of globe valves and/or butterfly valves effectively helps the water supply system to control the flow/switching of water, etc. Of course, the present invention is not limited thereto. In other embodiments, the number and/or positions of the shut-off valves/butterfly valves installed may be different, and are not limited to the embodiment shown in FIG. 1 . In addition, the series connection between the water pump groups can be realized through the pump water inlet superimposed pipe 7, and the pump water inlet superimposed pipe 7 can be provided with a shut-off valve.

In addition, for the water outlet end of each water pump group, a flow sensor 4 for detecting the water volume and a pressure sensor 5 for detecting the water pressure are also provided.

In some embodiments, the outlet water flow sensors 4 in each zone are used to optimize the energy consumption of the system, and scientifically implement flow changes in different time periods to select the water pump with the highest efficiency point to operate, so as to achieve energy saving effect. For example, the actual water flow of each district is fed back by the flow sensor, and the corresponding water pump is selected to form a district water supply pump group system when fully considering the actual peak instantaneous maximum and low valley instantaneous minimum flow when selecting the water pump. When the system is working normally, the flow data of each district is dynamically collected by the flow sensor and transmitted to the central control unit (for example, the control cabinet). After the internal program modeling of the central control unit, the actual flow data is compared with the program modeling data internally. Corresponding to the dynamic water flow at different time nodes, the pumps with corresponding parameters in the pump group of the system are dynamically dispatched in real time, so as to always ensure the maximum efficiency of each pump when it is working, achieve the purpose of optimizing pump efficiency and energy saving, and at the same time realize cloud online real-time monitoring for water supply enterprises The water flow data of each district provides convenience.

In addition, in some embodiments, during the normal operation of the system, the pump set in the low zone can continue to provide the flow required by the middle and high zone to the pump set in the middle zone while satisfying the water supply flow of users in the low zone. The water intake of the water supply pump in the middle area is superimposed on the basis of the water output from the pump in the low area, while the water intake of the water supply pump group in the high area is superimposed on the basis of the water output from the pump in the middle area, and so on. Of course, the present invention is not limited thereto. For example, in some other embodiments, it is possible to supply water to only two partitions, and thus only two water pump groups; And more than four pumps.

In addition, in some embodiments, a temperature sensor 3 and an over-temperature drain solenoid valve 9 may also be provided for each water pump in each water pump group. When the temperature sensor 3 detects that the water temperature rises due to the high temperature of the water pump during the water supply process of the water pump group with a small flow rate or no flow rate, the control cabinet can automatically control the over-temperature drainage solenoid valve 9 to open the valve to drain water. Return to the front of the pool or water pump to prevent damage to the water pump components and reduce the service life of the water pump.

Specifically, during the normal working process of each pump, if no one uses water in the system or the water flow is small, the water pump still needs to run, the purpose of which is to maintain the support pressure of the system pipeline. In this case, the temperature of the water pump may be too high due to no flow rate or too small flow rate of the water pump. If the temperature of the water pump cannot be cooled at this time, the water pump seal will wear out rapidly due to the high temperature of the water pump and the insulation of the motor will age, thereby reducing the temperature of the water pump. service life. When the system works normally, as mentioned above, the temperature sensor 3 feeds back the actual working temperature of the water pump in real time and transmits it to the central control unit. When the safety value is reached, the central control unit drives the drain solenoid valve 9 to drain the overheated water pump, and stop draining when the water level temperature of the water pump returns to a normal temperature value. In some embodiments, the drain water can be collected into the stainless steel water tank through pipelines for subsequent use or other purposes, which not only ensures the normal service life of the water pump, but also realizes the recovery of drain water.

In addition, the dynamic feedback of the water flow sensor corresponds to the water flow of the water pumps in each district to the intelligent control center (control cabinet). Through the calculation and comparison of the intelligent control center, it is possible to dynamically control the work switching of the pumps with different flow rates corresponding to the pumps in each district. It is used to ensure that the water flow corresponds to the reasonable flow of water pumps, and monitor the water supply data of the pump groups in each district at different time nodes, provide data support for scientific water supply, and at the same time realize that the energy consumption of the water pumps in each district is always/try to maintain at a high efficiency point, to achieve Optimize energy saving effect.

In some embodiments, all the equipment of the water supply system can be placed in the same equipment room. In a preferred embodiment, all the equipment can be placed in an underground equipment room, and the water supply in each area is transported to the corresponding users in each area through the corresponding pipelines in each area.

In addition, in the embodiment shown in FIG. 1 , the water supply pressure of the municipal pipe network can be directly superimposed, so as to realize water supply using municipal residual pressure. Of course, in some other embodiments, it is also possible to take water directly from the water tank or pool to realize the continuous water supply of the reservoir pump, or it can also be equipped with an intelligent water-inlet stacking device (Chinese Patent Application No. CN201310396340.6, published by the inventor) No. CN103422540A, the invention name is "Intelligent Water Inlet Lamination Device", which is incorporated by reference in its entirety in this paper) to realize two-way water inlet for the pump group. This water inlet method mainly solves the problem of replenishing water through the water tank when the flow of the municipal pipe network is insufficient at peak times. The way to realize the dynamic water intake of the pump group is to dynamically control the municipal water intake flow value through the water flow sensor of each pump group, so as to ensure that the pump group can make full use of the municipal residual pressure when the pump group is working without exceeding the municipal water supply when the municipal peak water is used. The normal flow corresponding to the design pipe diameter of the network project will lower the pressure of the municipal pipe network, causing the normal water consumption of municipal water users to be affected during peak hours. Additionally, in some embodiments, a suitable buffer tank may be provided for buffering the water supply.

This water supply superposition principle realizes a large amount of energy saving in the secondary water supply process. By calculating the water supply demand under the same conditions based on theoretical formulas, and supplying water through the superposition and series principle, compared with traditional water supply, it can directly save more than 40% of energy consumption. The water pumps (groups) in each district can collect the dynamic data of the instruments of the on-site series-connected water pump groups through the intelligent control cabinet system (not shown in Figure 1), and automatically control the coordinated water supply of each water pump (group) throughout the whole process, and accurately control the water supply process of the secondary water supply equipment , to achieve the lowest energy consumption, and at the same time improve the continuous, efficient and stable water supply, and achieve the purposes of saving electricity, water, and land.

Fig. 2 shows a schematic diagram of the principle of energy saving adopted by the laminated water supply system according to the embodiment shown in Fig. 1 . In the coordinate system of FIG. 2 , the horizontal axis indicates that the water pumps are installed on the same floor in the zonal water supply embodiment, and the vertical axis indicates the water pump stacking method in each zone in the water supply zonal embodiment corresponding to the floor height. In Figure 2, it is clearly seen that the water supply in the middle area makes full use of the rich head of the water supply in the low area, avoiding the waste of the rich head ΔH (Q, t) of the pump group in the low area (shown by the dotted arrow _in Figure 2 ). Similarly, the rich head ΔH (Q, t) of the water supply in the middle area is fully utilized _when the water is supplied in the high area. , avoiding the waste of the rich head of the water pump group in the central area (shown by the dotted arrow in Figure 2).

In a more specific embodiment, for example, in a stacked water supply system according to an embodiment of the present disclosure, it includes 4 integrated water pumps (groups), of which 1 is used as a supplementary/standby water supply pump for high areas, and the remaining 3 are The water pumps are stacked in series according to the embodiment of the present disclosure, and supply water to users in the low, medium and high areas respectively, and the water pumps (groups) are controlled by frequency conversion. Under normal working conditions, the system directly draws water from the municipal pipe network, and when it detects that the pressure of the municipal pipe network is too low (for example, 0.1Mpa), the system automatically switches to the water tank. The water tank is supplied by the municipal pipe network, and its water level is determined by Ball valve control.

In the comparison with the traditional parallel water supply system, for example, with a period of nearly 24 hours, under the condition that the water supply pressure of each district and the water level of the water tank are kept basically the same, the comparison between the system according to the embodiment of the present application and the traditional system is shown in Table 1 shown.

Table 1 - Comparison of Existing Water Supply System and Laminated Energy Saving Water Supply System

According to Table 1, it can be clearly seen that the unit water supply power consumption of the laminated water supply system according to the embodiment of the present application is only about 1 of that of the existing system under the condition of providing approximately the same water supply during approximately the same running time. /3.

FIG. 3 is a flowchart illustrating a method 400 for controlling district water supply that may be implemented in a control cabinet (control center) according to an embodiment of the present disclosure. As shown in FIG. 3 , the method 400 may include steps S410 , S420 , S430 , S440 and S450 . According to the present disclosure, some steps of the method 400 may be executed individually or in combination, and may be executed in parallel or sequentially, and are not limited to the specific operation sequence shown in FIG. 3 . In some embodiments, method 400 may be performed by a control cabinet or software installed thereon. In some other embodiments, the method 400 may also be executed by multiple different entities at multiple different locations, so as to achieve the same effect.

The method 400 starts at step S410. In step S410, the control cabinet may control the first water pump group connected to the municipal water supply network or the pool water tank, so as to use the first rich water head of the municipal water supply network to superimpose the water supply.

In step S420, the first water flow rate of the water supplied by the first water pump set may be detected by the control cabinet using the first water flow sensor connected to the water outlet end of the first water pump set.

In step S430, the second water pump set connected in series with the first water pump set may be controlled by the control cabinet, so as to superimpose the water supply by utilizing the second rich head of the water supply of the first water pump set.

In step S440, the control cabinet may use the second water outlet flow sensor connected to the water outlet end of the second water pump group to detect the second water outlet flow rate of the water supplied by the second water pump group.

In step S430, the control cabinet may control the working power of the water pumps in the first water pump group and/or the second water pump group based on the detected first water outlet flow and/or the second water outlet flow.

In some embodiments, the method 400 may further include: controlling a third water pump group connected in series with the second water pump group, so as to use the third rich head of the water supply of the second water pump group to superimpose the water supply; The third water outlet flow sensor at the outlet end of the water outlet to detect the third water outlet flow of the water supplied by the third water pump group; and based on the detected first water outlet flow, second water outlet flow and/or third water outlet flow, to control the first water pump Group, the working power of the second water pump group and/or the third water pump group.

In some embodiments, all pump sets may be located in the same equipment room.

In some embodiments, the control cabinet can control each water pump group according to the following formula: W=W _min +ΔW ₁ +ΔW ₂ , where W represents the unit power consumption value of the water pump group, and W _min represents the minimum unit power consumption of the water pump group. ΔW ₁ represents the additional unit power consumption value caused by the actual operating efficiency of the pump group deviating from the maximum efficiency, and ΔW ₂ represents the additional unit power consumption value caused by the actual operation of the water pump group with a rich lift, where each pump group is Control is to minimize ΔW ₁ +ΔW ₂ .

In some embodiments, Among them, Q represents the total flow of the water pump group, t represents the time, H(Q, t) represents the total head actually provided by the water supply system under the working condition (Q, t), η(Q, H) represents the water pump group under the working condition The overall operating efficiency under (Q, H), _Htotal (Q, t) represents the expected total head of the water supply system under the working condition (Q, t), η _max (Q, H) represents the water pump group under the working condition (Q , the highest efficiency under H), Δη(Q, H) represents the efficiency deviation between η(Q, H) and η _max (Q, H), and ΔH(Q, t) represents the difference between H(Q, t) and H The difference between _total (Q, t).

In some embodiments, each water pump group may consist of one or more SUS304 stainless steel pumps, one or more stop valves and one or more butterfly valves corresponding to each SUS304 stainless steel pump.

In some embodiments, the method 400 may further include: using a first temperature sensor connected to the first water pump group to detect the water temperature of the first water pump group; and controlling the first over-temperature drain solenoid valve connected to the first water pump group, Drainage can be performed when the first temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to avoid reducing the service life of the first water pump set due to overheating.

In some embodiments, the method 400 may further include: using a second temperature sensor connected to the second water pump group to detect the water temperature of the second water pump group; and controlling a second over-temperature drain solenoid valve connected to the second water pump group, Drainage can be performed when the second temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to protect the second water pump set from reducing its service life due to overheating.

In some embodiments, the method 400 may further include: using a first pressure sensor connected to the water outlet end of the first water pump group to measure the first water outlet pressure of the first water pump group; using a second pressure sensor connected to the water outlet end of the second water pump group The pressure sensor is used to measure the second water outlet pressure of the second water pump group; and the working power of each water pump group is also controlled according to the first water outlet pressure and/or the second water outlet pressure.

So far the invention has been described with reference to the preferred embodiments. It should be understood that various other changes, substitutions and additions can be made by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, the scope of the present invention is not limited to the specific embodiments described above, but should be defined by the appended claims.

Claims (10)

1. A water supply system for district water supply, comprising at least: The first water pump group, which is connected to the municipal water supply network or the water tank of the pool, and uses the first rich head of the water supply of the municipal water supply network to superimpose the water supply; a first water outlet flow sensor, which is connected to the water outlet end of the first water pump group, and is used to detect the first water outlet flow rate of the water supply of the first water pump group; The second water pump group is connected in series with the first water pump group and uses the existing lift and excess flow of the water supply of the first water pump group to provide the required flow of superimposed water supply; a second water outlet flow sensor, which is connected to the water outlet end of the second water pump group, and is used to detect a second water outlet flow rate of the water supplied by the second water pump group; and The control cabinet is respectively connected with the first water pump group, the second water pump group, the first water outlet flow sensor and the second water outlet flow sensor, and based on the detected first water outlet flow and/or the first water outlet flow Two water outlet flow rates are used to control the configuration parameters of different water pumps in the first water pump group and/or the second water pump group to operate at the best working efficiency. 2. The water supply system according to claim 1, further comprising: A third water pump group, which is connected in series with the second water pump group and utilizes the existing lift and excess flow of the water supply of the second water pump group to provide superimposed water supply with required flow; a third water outlet flow sensor, which is connected to the water outlet end of the third water pump group, and is used to detect the third water outlet flow rate of the water supplied by the third water pump group, Wherein, the control cabinet is also respectively connected with the third water pump group and the third water outlet flow sensor, and controls the Different configuration parameters of the water pumps in the first water pump group, the second water pump group and/or the third water pump group are used to operate at the best working efficiency. 3. The water supply system according to claim 1 or 2, wherein all water pump sets are located in the same equipment room. 4. The water supply system according to claim 1 or 2, wherein the control cabinet controls each water pump group according to the following formula: W＝W _min +ΔW ₁ +ΔW ₂ Among them, W represents the unit power consumption value of the water pump group, W _min represents the minimum unit power consumption value of the water pump group, ΔW ₁ represents the additional unit power consumption value caused by the deviation of the actual operating efficiency of the water pump group from the maximum efficiency, and ΔW ₂ represents the The extra unit power consumption value caused by the rich head in the actual operation of the group, Wherein, the control cabinet controls each water pump group to minimize ΔW ₁ +ΔW ₂ . 5. The water supply system according to claim 4, wherein, ${\mathrm{<span\; class="notranslate">\; \&Delta;W</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;H</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 367</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; \}</span>$ Among them, Q represents the total flow of the water pump group, t represents the time, H (Q, t) represents the total lift actually provided by the water supply system under the working condition (Q, t), and η (Q, H) represents the water pump group in The overall operating efficiency under the working condition (Q, H), _Htotal (Q, t) represents the desired total head of the water supply system under the working condition (Q, t), and η _max (Q, H) represents the water pump group in The highest efficiency under working conditions (Q, H), Δη(Q, H) represents the efficiency deviation between η(Q, H) and η _max (Q, H), ΔH(Q, t) represents H(Q, t) and the difference between _Htotal (Q, t). 6. The water supply system according to claim 1, wherein each water pump group is composed of one or more SUS304 stainless steel pumps, one or more stop valves and one or more butterfly valves corresponding to each SUS304 stainless steel pump. 7. The water supply system of claim 1, further comprising: a first temperature sensor connected to the first water pump set and the control cabinet for detecting the water temperature of the first water pump set; and The first over-temperature drain solenoid valve, which is connected to the first water pump group and the control cabinet, is used to discharge water when the first temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to avoid the first The service life of the water pump unit is reduced due to heat. 8. The water supply system of claim 7, further comprising: a second temperature sensor connected to the second water pump set and the control cabinet for detecting the water temperature of the second water pump set; and The second over-temperature drain solenoid valve, which is connected to the second water pump group and the control cabinet, is used to discharge water when the second temperature sensor detects that the water temperature exceeds a predetermined threshold, so as to avoid the second The service life of the water pump unit is reduced due to heat. 9. The water supply system of claim 1, further comprising: a first pressure sensor connected to the water outlet end of the first water pump group to measure the first water outlet pressure of the first water pump group; and a second pressure sensor connected to the water outlet end of the second water pump group to measure the second water outlet pressure of the second water pump group, Wherein, the control cabinet also controls the working power of each water pump group according to the first water outlet pressure and/or the second water outlet pressure. 10. A method for controlling a water pump set to perform superimposed water supply, comprising: controlling a first set of water pumps connected to a municipal water supply network or a pool tank to utilize a first rich head of said municipal water supply network to superimpose the water supply; using a first water outlet flow sensor connected to the water outlet end of the first water pump group to detect a first water outlet flow rate of the water supply of the first water pump group; controlling the second water pump group connected in series with the first water pump group to use the second rich head of the water supply of the first water pump group to superimpose the water supply; using a second water outlet flow sensor connected to the water outlet end of the second water pump group to detect a second water outlet flow rate of the water supply of the second water pump group; and Based on the detected first water output flow rate of the first water pump set and/or the second water output flow rate of the second water pump set, the working power of the water pumps in the first water pump set and/or the second water pump set is controlled.