A tank type non-negative pressure water supply device and a water supply method

Abstract

The application belongs to the technical field of water supply equipment, and particularly relates to a tank type non-negative pressure water supply equipment and a water supply method, which comprises a constant pressure tank, a variable frequency main pump, a high pressure compensation tank, a multifunctional pump and a three-way valve. The constant pressure tank is connected with a municipal pipe network. The variable frequency main pump is connected between the constant pressure tank and a water outlet main pipe. The high pressure compensation tank is connected with the water outlet main pipe. The multifunctional pump has a first end and a second end. The first end is connected with the constant pressure tank, and the second end is connected with the high pressure compensation tank. The three-way valve has a first interface, a second interface and a third interface. The first interface is connected with the first end of the multifunctional pump. The second interface is connected with the second end of the multifunctional pump and the high pressure compensation tank respectively. The third interface is connected with the water outlet main pipe. Through the above structure and connection mode, the operation energy consumption of the equipment can be greatly reduced, the operation efficiency of the equipment can be improved, and the purpose of energy saving and consumption reduction can be achieved.

Description

Technical Field

[0001] This invention belongs to the field of water supply equipment technology, specifically relating to a tank-type negative pressure-free water supply equipment and water supply method. Background Technology

[0002] Secondary water supply for residential use began in the early 1980s and has evolved through gravity flow, pneumatic pressure, variable frequency constant pressure, and negative pressure-free water supply. Currently, the most commonly used methods are variable frequency constant pressure and negative pressure-free water supply. With national policies requiring unified construction and management of water supply companies, the safety and energy efficiency of water supply equipment have become crucial. However, in practical applications, most current negative pressure-free water supply equipment suffers from the following problems:

[0003] 1. The water pump power is not matched with the actual occupancy rate, which causes a large number of devices to operate inefficiently, especially during the night when the water flow is low. When the pressure of the main water pipe cannot be maintained, the equipment will be in an inefficient operation or frequently start and stop, which not only results in large energy loss, but also shortens the service life of the equipment.

[0004] 2. When the pressure in the municipal water supply network drops, the water supply equipment has limited compensation capacity and a short compensation time. This can either create negative pressure on the municipal water supply network or the equipment itself, or it may necessitate shutdown to prevent the generation of negative pressure. The former is extremely damaging to the network and equipment, while the latter severely impacts users' water usage.

[0005] Therefore, in view of the above shortcomings, the present invention urgently needs to provide a tank-type negative pressure-free water supply device that can solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a tank-type negative pressure-free water supply device and water supply method to solve the problems of low efficiency operation or frequent start-stop of existing negative pressure-free water supply devices, resulting in large energy losses and short service life.

[0007] In a first aspect, the present invention provides a tank-type negative pressure-free water supply device, the water supply device being connected between a municipal pipe network and a main outlet pipe, comprising: a constant pressure tank, the constant pressure tank being connected to the municipal pipe network; and a variable frequency main pump, the variable frequency main pump being connected between the constant pressure tank and the main outlet pipe;

[0008] A high-pressure compensation tank is connected to the main outlet pipe; a multi-functional pump has a first end and a second end, the first end being connected to the constant pressure tank and the second end being connected to the high-pressure compensation tank; a three-way valve has a first interface, a second interface and a third interface, the first interface being connected to the first end of the multi-functional pump, the second interface being connected to the second end of the multi-functional pump and the high-pressure compensation tank respectively, and the third interface being connected to the main outlet pipe.

[0009] The canned non-negative pressure water supply equipment as described above is further preferably further provided with a first pressure sensor, a second pressure sensor and a third pressure sensor. The first pressure sensor is arranged on the total water outlet pipe, the second pressure sensor is arranged at the water inlet end of the high-pressure compensation tank, and the third pressure sensor is arranged at the municipal water supply network.

[0010] The canned non-negative pressure water supply equipment as described above is further preferably further provided with a first pressure reducing valve and a second pressure reducing valve. The first pressure reducing valve is arranged between the high-pressure compensation tank and the total water outlet pipe, and the second pressure reducing valve is arranged between the first pressure reducing valve and the municipal water supply network.

[0011] The canned non-negative pressure water supply equipment as described above is further preferably provided with a reducing joint between the variable frequency main pump and the constant pressure tank, and a first check valve is arranged between the variable frequency main pump and the total water outlet pipe.

[0012] The present invention further provides a water supply method, which is realized by using the canned non-negative pressure water supply equipment described in any one of the above, and includes the following steps:

[0013] S1: Set a preset threshold PT1 for the total water outlet pipe, a preset threshold PT2 for the high-pressure compensation tank, and a preset threshold PT3 for the municipal water supply network, where PT2≥PT1>PT3; set an idle time interval and a busy time interval;

[0014] S2: When the pressure value P1 of the total water outlet pipe < PT1 or the pressure value P3 of the municipal water supply network < PT3, the pressure value P2 of the high-pressure compensation tank is greater than the pressure value P3 of the municipal water supply network, and the time is within the busy time interval, execute the peak water supply plan;

[0015] S3: When the pressure value P3 of the municipal water supply network ≥ PT3 and the pressure value P2 of the high-pressure compensation tank < PT2, execute the normal water supply plan;

[0016] S4: When the pressure value P3 of the municipal water supply network ≥ PT3, the pressure value P2 of the high-pressure compensation tank ≥ PT2, the pressure value P1 of the total water outlet pipe ≥ PT1, and the time is within the busy time interval, execute the instantaneous small flow water supply plan;

[0017] S5: When the pressure value P3 of the municipal water supply network ≥ PT3, the pressure value P2 of the high-pressure compensation tank ≥ PT2, and the time is within the idle time interval, execute the idle small flow water supply plan.

[0018] The water supply method as described above is further preferably that the peak water supply plan in S2 specifically includes:

[0019] S21: Connect the second interface and the third interface of the three-way valve;

[0020] S22: Connect the high-pressure compensation tank and the municipal pipeline network so that the water in the high-pressure compensation tank flows into the municipal pipeline network and then into the constant pressure tank;

[0021] S23: Reduce the frequency to start the variable frequency main pump and pump the water in the constant pressure tank to the main outlet pipe.

[0022] The water supply method described above is further preferably further comprising, in step S21, connecting the high-pressure compensation tank and the municipal pipeline network, including:

[0023] S221: Open the first pressure reducing valve to allow the water from the high-pressure compensation tank to flow into the main outlet pipe until the pressure difference between the high-pressure compensation tank and the first pressure reducing valve is equal to the pressure value of the main outlet pipe;

[0024] S222: Open the second pressure reducing valve to connect the high-pressure compensation tank and the municipal pipeline network.

[0025] The water supply method described above is further preferably characterized in that the normal water supply scheme in S3 specifically includes:

[0026] S31: The first port of the three-way valve is connected to the third port;

[0027] S32: Start the variable frequency main pump to pressurize and pump the water in the constant pressure tank to the main outlet pipe;

[0028] S33: Turn on the multi-functional pump to pump part of the water in the main outlet pipe to the high-pressure compensation tank for storage and standby, until the pressure value P2 of the high-pressure compensation tank is greater than or equal to PT2.

[0029] The water supply method described above is further preferably characterized in that the instantaneous low-flow water supply scheme in S4 includes:

[0030] S41: The first port of the three-way valve is connected to the third port;

[0031] S42: Turn off the variable frequency main pump, connect the high pressure compensation tank and the main outlet pipe, and supply water to the main outlet pipe through the high pressure compensation tank until the pressure difference between the high pressure compensation tank and the main outlet pipe reaches the preset value;

[0032] S42: Start the normal water supply program until the pressure value P1 of the main water outlet pipe is greater than or equal to PT1 and the pressure value P2 of the high-pressure compensation tank is greater than or equal to PT2.

[0033] S43: Repeat steps S41 and S42.

[0034] The water supply method described above is further preferably wherein, in step S41, the connection between the high-pressure compensation tank and the main outlet pipe includes:

[0035] S411: Open the first pressure reducing valve to allow the water in the high-pressure compensation tank to be reduced in pressure and then compensated to the main outlet pipe until the pressure difference between the high-pressure compensation tank and the first pressure reducing valve is the same as the pressure value of the main outlet pipe.

[0036] The water supply method described above is further preferably characterized by the following in S5: During off-peak hours, the low-flow water supply scheme includes:

[0037] S51: Turn off the variable frequency main pump and the multi-functional pump, connect the high pressure compensation tank and the main outlet pipe, and supply water to the main outlet pipe through the high pressure compensation tank until the pressure values ​​of the high pressure compensation tank and the main outlet pipe are the same;

[0038] S52: Connect the second and third ports of the three-way valve, and turn on the multi-functional pump to pump the low-pressure water in the constant pressure tank to the main outlet pipe.

[0039] The water supply method described above is further preferably wherein, in step S51, connecting the high-pressure compensation tank and the main outlet pipe to supply water to the main outlet pipe via the high-pressure compensation tank includes:

[0040] S511: If the pressure difference between the high-pressure compensation tank and the first pressure reducing valve is greater than the pressure value of the main water outlet pipe, then proceed to step S512; otherwise, proceed to step S513.

[0041] S512: Connect the first port and the third port of the three-way valve; open the first pressure reducing valve so that the water in the high pressure compensation tank flows into the main outlet pipe after passing through the first pressure reducing valve, until the pressure difference between the high pressure compensation tank and the first pressure reducing valve is the same as the pressure of the main outlet pipe, and execute step S513;

[0042] S513: Connect the second and third ports of the three-way valve so that the water in the high-pressure compensation tank flows directly into the main outlet pipe until the pressure value of the high-pressure compensation tank is the same as the pressure of the main outlet pipe.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] This invention, by incorporating a constant pressure tank, a variable frequency main pump, a high-pressure compensation tank, a multi-functional pump, and an electric three-way valve, and their interconnections, ensures normal water supply while extending the dormancy period of the variable frequency main pump during peak and off-peak water demand periods through the use of the high-pressure compensation tank, electric three-way valve, and multi-functional pump, thereby achieving energy conservation and consumption reduction. Furthermore, the use of the constant pressure tank, electric three-way valve, and multi-functional pump allows the variable frequency main pump to remain in a long-term dormant state during periods of low water demand, significantly reducing equipment operating energy consumption and improving equipment operating efficiency.

[0045] This invention connects the high-pressure compensation tank to the municipal water supply network, enabling it to solve the problem of insufficient municipal water supply during normal water supply periods when used in conjunction with a constant pressure tank, variable frequency main pump, high-pressure compensation tank, multi-functional pump, and electric three-way valve. This allows the tank-type negative pressure-free water supply equipment to operate normally during peak water usage periods when the municipal water supply is insufficient, avoiding water outages during peak water usage and ensuring water supply capacity.

[0046] This invention achieves on / off control between the high-pressure compensation tank and the main outlet pipe by setting a first pressure reducing valve, and achieves on / off control between the high-pressure compensation tank and the municipal pipe network by setting a second pressure reducing valve. Furthermore, the pressure difference between the first and second pressure reducing valves is small, thereby reducing the losses caused by the pressure difference.

[0047] This invention also achieves intelligent control by setting up a pressure sensor group and an intelligent control cabinet, enabling the entire tank-type negative pressure water supply equipment to operate fully automatically and improving the overall automation level of the equipment. Attached Figure Description

[0048] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 This is a structural connection diagram of the tank-type negative pressure-free water supply equipment in this invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1-Municipal pipeline network, 2-Valve, 3-Filter, 4-Fifth check valve, 5-Second electromagnetic pressure reducing valve, 6-Third pressure gauge, 7-Third pressure sensor, 8-First electromagnetic pressure reducing valve, 9-High pressure compensation tank, 10-Water storage capsule, 11-Constant pressure tank, 12-Reducing joint, 13-Variable frequency main pump, 14-First check valve, 15-First pressure gauge, 16-First pressure sensor, 17-Three-way valve, 18-Multi-functional pump, 19-Pressure tank, 20-Intelligent control cabinet, 21-Main outlet pipe, 22-User pipeline network. Detailed Implementation

[0052] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0055] As Figure 1 As shown, a tank-type non-negative pressure water supply device provided in this embodiment is connected between the municipal water supply network 1 and the outlet main pipe 21, and is adapted to pressurize and pump the low-pressure water provided by the municipal water supply network 1 into the outlet main pipe 21. Specifically, the tank-type non-negative pressure water supply device in this embodiment mainly includes a constant pressure tank 11, a variable frequency main pump 13, a high-pressure compensation tank 9, a multi-functional pump 18, and a three-way valve 17.

[0056] The constant pressure tank 11 is used for storing water. Specifically, the output end of the constant pressure tank 11 is connected to the municipal water supply network 1 through a first connecting pipe provided with a valve 2, a filter 3, a fifth check valve 4, a first pressure gauge 15, and a first pressure sensor 16, and is adapted to introduce the water source in the municipal water supply network 1 into the constant pressure tank 11 through the first connecting pipe. Among them, the filter 3 is adapted to filter, the valve 2 is adapted to control the on / off of the first connecting pipe, the fifth check valve 4 is adapted to limit the flow direction of the water source in the first connecting pipe, and the third pressure gauge 6 and the third pressure sensor 7 are both used to detect the water pressure in the first connecting pipe. Specifically, when the pressure values P3 detected by the third pressure gauge 6 and the third pressure sensor 7 are less than the preset threshold value PT3 of the municipal water supply network, that is, P3 < PT3, the municipal water supply network 1 is in a state of insufficient water supply; when the pressure values of the third pressure gauge 6 and the third pressure sensor 7 are greater than the preset threshold value of the municipal water supply network, that is, P3 ≥ PT3, the municipal water supply network 1 is in a state of sufficient water supply.

[0057] The variable frequency main pump 13 is used for variable frequency pumping. Specifically, the variable frequency main pump 13 has an input end and an output end. Its input end is connected to the output end of the constant pressure tank 11 through a second connecting pipe equipped with a reducing connector 12. Its output end is connected to the outlet pipeline through a third connecting pipe equipped with a first check valve 14, thereby pressurizing and pumping the low-pressure water in the constant pressure tank 11 to the outlet main pipe 21, and then transporting it to the pipeline network through the outlet main pipe 21. The outlet main pipe 21 is equipped with a first pressure gauge 15 and a first pressure sensor 16 suitable for monitoring the pressure in the outlet main pipe 21. The pressure value of the outlet main pipe 21 during normal water supply is a preset threshold PT1. When the pressure value of the first pressure gauge 15 and the first pressure sensor 16 is greater than or equal to the preset threshold of the outlet main pipe 21, that is, P1≥PT1, normal water supply is possible. When the pressure value of the first pressure gauge 15 and the first pressure sensor 16 is less than the preset threshold PT1 of the outlet main pipe 21, P1<PT1, normal water supply is not possible. The variable frequency main pump 13 is used to automatically adjust the output frequency and speed according to the pressure value in the outlet pipeline to draw water from the constant pressure tank 11 to supply the outlet pipeline, thereby ensuring that the pressure value in the outlet pipeline is greater than or equal to the preset threshold PT1 of the outlet main pipe 21. Preferably, there are multiple variable frequency main pumps 13, which are connected in parallel between the constant pressure tank 11 and the outlet main pipe 21 to form a variable frequency pump group.

[0058] The high-pressure compensation tank 9 is used for water storage. Specifically, the high-pressure compensation tank 9 includes a tank body and a food-grade water storage capsule 10 built into the inside of the tank body. The space between the water storage capsule 10 and the tank body of the high-pressure compensation tank 9 is filled with high-pressure air, which is suitable for maintaining a certain pressure in the high-pressure compensation tank 9. In this embodiment, the high-pressure compensation tank 9 is a temporary water storage unit. Specifically, the high-pressure compensation tank 9 is connected to the main water outlet pipe 21 through a fourth connecting pipe equipped with a first pressure reducing valve and a fourth check valve, and is connected to the municipal water supply network 1 through a fifth connecting pipe equipped with a second pressure reducing valve. Preferably, the fifth connecting pipe is connected to the fourth connecting pipe, and the joint is located between the first pressure reducing valve and the fourth check valve, which is suitable for connecting the first pressure reducing valve and the second pressure reducing valve in series. A second pressure gauge and a second pressure sensor for monitoring the pressure in the high-pressure compensation tank 9 are also provided on the fourth connecting pipe between the first pressure reducing valve and the second pressure reducing valve. A fourth pressure gauge for monitoring the pressure value is also provided between the first pressure reducing valve and the second pressure reducing valve. Through the above structure and connection method, the high-pressure compensation tank 9 can obtain its own status through the pressure value on the second pressure gauge or the second pressure sensor, and can also supply water to the main water outlet 21 through the first pressure reducing valve, and supply water to the municipal water supply network 1 through the first pressure reducing valve and the second pressure reducing valve.

[0059] The multi-functional pump 18 is used for pumping, and the three-way valve 17 is a selection switch. Specifically, the multi-functional pump 18 has a first end and a second end. The first end is connected to the output end of the constant pressure tank 11 through a sixth connecting pipe equipped with a second check valve, and the second end is connected to the high-pressure compensation tank 9 through a seventh connecting pipe equipped with a third check valve. The three-way valve 17 has a first interface, a second interface, and a third interface. The first interface is connected to the second end of the multi-functional pump 18 through an eighth connecting pipe; the second interface is connected to the seventh connecting pipe through a ninth connecting pipe, and the contact point is located between the third check valve and the high-pressure compensation tank 9, thereby achieving connection to the second end of the multi-functional pump 18 and the high-pressure compensation tank 9 respectively; the third interface is connected to the main outlet pipe 21 through a tenth connecting pipe. To facilitate the switching of the pathways between the first, second, and third interfaces, preferably, the three-way valve 17 is configured as an electric three-way valve 17. The multi-functional pump 18 is used in conjunction with the three-way valve 17. It is suitable for connecting the multi-functional pump 18 to different passages by controlling the passage in the three-way valve 17, so that it has the functions of storing water in the high-pressure compensation tank 9 with the water source of the main outlet pipe 21 and supplying water to the main outlet pipe 21 with the water source of the constant pressure tank 11.

[0060] The tank-type negative pressure-free water supply equipment in this embodiment also includes an intelligent control cabinet 20 for intelligent control. Specifically, the intelligent control cabinet 20 is electrically connected to the first pressure sensor 16, the second pressure sensor, the third pressure sensor 7, the first electromagnetic pressure reducing valve 8, the second electromagnetic pressure reducing valve 5, the electric three-way valve 17, the variable frequency main pump 13, and the multi-functional pump 18. It is suitable for obtaining the pressure and pressure change of the main outlet pipe 21 through the first pressure sensor 16, obtaining the pressure and pressure change in the high pressure compensation tank 9 through the second pressure sensor, and obtaining the pressure and pressure change at the access end of the municipal pipeline network 1 through the third pressure sensor 7. In this way, it can obtain the status of the municipal pipeline network 1, the main outlet pipe 21, and the high pressure compensation tank 9, and then send corresponding control commands to the first electromagnetic pressure reducing valve 8, the second electromagnetic pressure reducing valve 5, the electric three-way valve 17, the variable frequency main pump 13, and the multi-functional pump 18 to achieve intelligent control.

[0061] In addition, a pressure tank 19 is connected to the main water outlet pipe for pressure replenishment of the main water outlet pipe.

[0062] The present invention also provides a water supply method, which is implemented by the tank-type negative pressure-free water supply device in the above embodiments. Specifically, the water supply method includes the following steps:

[0063] S1: Set the preset threshold PT1 for the main water outlet pipe 21, the preset threshold PT2 for the high-pressure compensation tank 9, and the preset threshold PT3 for the municipal network pipe, where PT2≥PT1>PT3; set the idle time interval and the busy time interval.

[0064] S2: When the pressure value P1 of the outlet main pipe 21 < PT1 or the pressure value P3 of the municipal water supply network 1 < PT3, the pressure value P2 of the high-pressure compensation tank 9 is greater than the pressure value P3 of the municipal water supply network 1, and the time is within the peak water supply time interval, execute the peak water supply plan;

[0065] S3: When the pressure value P3 of the municipal water supply network 1 ≥ PT3 and the pressure value P2 of the high-pressure compensation tank 9 < PT2, execute the normal water supply plan;

[0066] S4: When the pressure value P3 of the municipal water supply network 1 ≥ PT3, the pressure value P2 of the high-pressure compensation tank 9 ≥ PT2, the pressure value P1 of the outlet main pipe 21 ≥ PT1, and the time is within the peak water supply time interval, execute the instantaneous small flow water supply plan;

[0067] S5: When the pressure value P3 of the municipal water supply network 1 ≥ PT3, the pressure value P2 of the high-pressure compensation tank 9 ≥ PT2, and the time is within the off-peak water supply time interval, execute the off-peak small flow water supply plan.

[0068] In the above solutions, the pressure value P1 of the outlet main pipe 21 can be measured by the first pressure sensor 16, the pressure value P2 of the high-pressure compensation tank 9 can be measured by the second pressure sensor, and the pressure value P3 of the municipal water supply network 1 can be measured by the third pressure sensor 7. The peak water supply time interval is set as 06:00 - 22:00, and the off-peak water supply time interval is set as 22:00 - 06:00. Specifically, the peak water supply time interval, the off-peak water supply time interval, the preset threshold PT1 of the outlet main pipe 21, the preset threshold PT2 of the high-pressure compensation tank 9, and the preset threshold PT3 of the municipal water supply network are all set manually and can be changed according to needs.

[0069] Specifically, the peak water supply plan in S2 specifically includes:

[0070] S21: Connect the second interface and the third interface of the three-way valve 17;

[0071] S22: Connect the high-pressure compensation tank 9 and the municipal water supply network 1, so that the water in the high-pressure compensation tank 9 flows into the municipal water supply network 1 and then into the constant pressure tank 11;

[0072] S23: Start the variable frequency main pump 13 at a reduced frequency, and pump the water in the constant pressure tank 11 to the outlet main pipe 21.

[0073] Among them, connecting the high-pressure compensation tank 9 and the municipal water supply network 1 in S21 further includes:

[0074] S221: Open the first pressure reducing valve, so that the water in the high-pressure compensation tank 9 flows into the outlet main pipe 21 until the pressure difference between the high-pressure compensation tank 9 and the first pressure reducing valve is equal to the pressure value of the outlet main pipe 21;

[0075] S222: Open the second pressure reducing valve to connect the high-pressure compensation tank 9 and the municipal water supply network 1.

[0076] The peak water supply plan is mainly used to achieve less water supply when the municipal water supply network 1 is in a state of insufficient incoming water.

[0077] The peak water supply plan is used during the peak water consumption period or the transition period from peak water consumption to low-demand water consumption when the incoming water of the municipal water supply network 1 is insufficient. At this time, P1 < PT1 or P3 < PT3, and P2 > P3. During this period, the intelligent control cabinet 20 instructs the variable-frequency main pump 13 to reduce its frequency to reduce the water intake, and at the same time opens the first pressure reducing valve and the second pressure reducing valve to connect the high-pressure compensation tank 9 and the municipal water supply network 1, so that the water in the high-pressure compensation tank 9 is combined with the incoming water in the municipal water supply network 1 in the constant pressure tank 11 after two pressure relieves to achieve peak water consumption differential compensation until P2 = P3.

[0078] Specifically, the normal water supply plan in S3 specifically includes:

[0079] S31: Connect the first interface and the third interface of the three-way valve 17 to communicate;

[0080] S32: Start the variable-frequency main pump 13 to pump the water in the constant pressure tank 11 to the water outlet main pipe 21 under pressure;

[0081] S33: Start the multi-functional pump 18 to pump a part of the water in the water outlet main pipe 21 into the high-pressure compensation tank 9 for storage and standby until the pressure value P2 of the high-pressure compensation tank 9 ≥ PT2.

[0082] Through the above normal water supply plan, normal water supply in the normal water supply state can be achieved.

[0083] The normal water supply plan is used when it is the peak water consumption period and the municipal water supply network 1 has sufficient water supply, that is, P3 ≥ PT3 and P2 < PT2. At this time, the intelligent control cabinet 20 instructs the variable-frequency main pump 13 to start and adjusts the frequency and speed of the variable-frequency main pump 13 according to the measured pressure value P1 in the first pressure sensor 16. Thus, not only is the municipal water supply network 1, the constant pressure tank 11, and the water outlet main pipe 21 connected to supply water to the user water supply network 22, but also the pressure value P1 in the water outlet main pipe 21 is within the set range. At the same time, the third interface and the first interface of the electric three-way valve 17 are导通, the multi-functional pump 18 starts, and a part of the high-pressure water in the water outlet main pipe 21 is pressurized and transported to the high-pressure compensation tank 9 through the electric three-way valve 17 via the multi-functional pump 18, and the transportation stops until the pressure value P2 in the second pressure sensor ≥ PT2, preparing for subsequent compensation.

[0084] Specifically, the instantaneous small-flow water supply plan in S4 includes:

[0085] S41: Connect the first interface and the third interface of the three-way valve 17 to communicate;

[0086] S42: Turn off the variable frequency main pump 13, connect the high pressure compensation tank 9 and the water outlet main pipe 21, and supply water to the water outlet main pipe 21 through the high pressure compensation tank 9 until the pressure difference between the high pressure compensation tank 9 and the water outlet main pipe 21 reaches a preset value;

[0087] S42: Start the normal water supply program until the pressure value P1 of the main water outlet pipe 21 is greater than PT1 and the pressure value P2 of the high pressure compensation tank 9 is greater than PT2;

[0088] S43: Repeat steps S41 and S42.

[0089] S41, which connects the high-pressure compensation tank 9 and the main outlet pipe 21, includes:

[0090] S411: Open the first pressure reducing valve to allow the water in the high-pressure compensation tank 9 to be reduced in pressure and then compensated to the main water outlet pipe 21 until the pressure difference between the high-pressure compensation tank 9 and the first pressure reducing valve is the same as the pressure value of the main water outlet pipe 21.

[0091] The above-mentioned instantaneous low-flow water supply scheme can provide water for the instantaneous low-flow water usage during peak hours.

[0092] The instantaneous low-flow water supply scheme is used during the transition period between peak and low-demand water use. During this period, the municipal water supply network 1 has sufficient water supply (P3≥PT3), the high-pressure compensation tank 9 has sufficient reserves (P2≥PT2), and the pressure of the main outlet pipe 21 also remains above the preset threshold (P1≥PT1). Furthermore, because user water demand is relatively lower than during peak periods, the impact on the pressure in the main outlet pipe 21 is also smaller, meaning the fluctuation in the value of the first pressure sensor 16 is relatively small. At this time, the intelligent control cabinet 20 instructs the variable frequency main pump 13 and the high-pressure compensation tank 9 to alternately supply water to the main outlet pipe 21. Specifically, when the value P2 in the second pressure sensor is greater than or equal to PT2, the intelligent control cabinet 20 instructs the variable frequency main pump 13 to go into sleep mode. At the same time, when the pressure of the main outlet pipe 21 measured by the first pressure sensor 16 decreases, it instructs the first electromagnetic pressure reducing valve 8 to open, connecting the high-pressure compensation tank 9 to the main outlet pipe 21. The water source in the high-pressure compensation tank 9 is depressurized through the first electromagnetic pressure reducing valve 8 and then replenished to the main outlet pipe 21 to restore the pressure value of the main outlet pipe 21, until the pressure difference between the second pressure sensor and the first pressure sensor 16 is equal to the pressure value of the first electromagnetic pressure reducing valve 8, that is, the compensation capacity of the high-pressure compensation tank 9 is insufficient. At this time, the intelligent control cabinet 20 instructs the variable frequency main pump 13 to start normally, and at the same time adjusts the electric three-way valve 17 to connect the third interface and the first interface, so that the constant pressure tank 11 supplies water to the outlet pipe and fills the high-pressure compensation tank 9 with water, until the second pressure sensor reaches the second preset threshold, that is, when the high-pressure compensation tank 9 is full, the intelligent control cabinet 20 instructs the variable frequency main pump 13 to go into sleep mode and stop. Then, by repeating the above process, a new round of instantaneous compensation begins.

[0093] Specifically, the off-peak low-flow water supply scheme in S5 includes:

[0094] S51: Turn off the variable frequency main pump 13 and the multi-functional pump 18, connect the high pressure compensation tank 9 and the water outlet main pipe 21, and supply water to the water outlet main pipe 21 through the high pressure compensation tank 9 until the pressure values ​​of the high pressure compensation tank 9 and the water outlet main pipe 21 are the same;

[0095] S52: Connect the second and third ports of the three-way valve 17, and turn on the multi-functional pump 18 to pump the low-pressure water in the constant pressure tank 11 to the main outlet pipe 21.

[0096] Wherein, S51, connecting the high-pressure compensation tank 9 and the main water outlet pipe 21, supplies water to the main water outlet pipe 21 through the high-pressure compensation tank 9, includes:

[0097] S511: If the pressure difference between the high-pressure compensation tank 9 and the first pressure reducing valve is greater than the pressure value of the main water outlet pipe 21, then execute step S512; otherwise, execute step S513.

[0098] S512: Connect the first port and the third port of the three-way valve 17; open the first pressure reducing valve so that the water in the high pressure compensation tank 9 flows into the outlet main pipe 21 after passing through the first pressure reducing valve, until the pressure difference between the high pressure compensation tank 9 and the first pressure reducing valve is the same as the pressure of the outlet main pipe 21, and execute step S513.

[0099] S513: Connect the second and third ports of the three-way valve 17 so that the water in the high-pressure compensation tank 9 flows directly into the main outlet pipe 21 until the pressure value of the high-pressure compensation tank 9 is the same as the pressure of the main outlet pipe 21.

[0100] The above-mentioned low-flow water supply scheme during off-peak hours can achieve long-term low-flow water supply during off-peak hours.

[0101] Low-flow water supply occurs during prolonged periods of low water demand. During this period, the pressure in the municipal water supply network 1 is sufficient (P3 ≥ PT3), and the high-pressure compensation tank 9 has sufficient reserves (P2 ≥ PT2). Only sporadic users generate water demand, and this demand has a smaller impact on the pressure in the main outlet pipe 21. Specifically, the value in the first pressure sensor 16 remains stable, while the value in the third pressure sensor 7 fluctuates only slightly over a long period. During this period, the intelligent controller instructs the variable frequency main pump 13 to shut down and supply water through the high-pressure compensation tank 9 and the multi-energy pump.

[0102] First, water is supplied to the outlet pipeline through the high-pressure compensation tank 9. Specifically:

[0103] First, the intelligent control cabinet 20 instructs the variable frequency main pump 13 to go into sleep mode. At the same time, when the first pressure sensor 16 detects a decrease in the pressure of the main outlet pipe 21, it instructs the first electromagnetic pressure reducing valve 8 to open, so that the high pressure compensation tank 9 is connected to the main outlet pipe 21. The water source in the high pressure compensation tank 9 is depressurized through the first electromagnetic pressure reducing valve 8 and then replenished to the main outlet pipe 21 to restore the pressure value of the main outlet pipe 21 until the pressure difference between the second pressure sensor and the first pressure sensor 16 is equal to the pressure value of the first electromagnetic pressure reducing valve 8.

[0104] Secondly, the intelligent control cabinet 20 instructs the electromagnetic three-way valve 17 to connect to the second and third interfaces, so that the water in the high-pressure compensation tank 9 flows directly into the main outlet pipe 21 until the pressure value of the high-pressure compensation tank 9 is the same as the pressure of the main outlet pipe 21.

[0105] Next, the intelligent control cabinet 20 instructs the electromagnetic three-way valve 17 to connect to the second and third interfaces, and to open the multi-functional pump 18 to pump the low-pressure water in the constant pressure tank 11 to the main outlet pipe 21.

[0106] Through the above settings, not only can normal water supply be achieved, but also, on the one hand, the high-pressure compensation tank 9 ensures that the tank-type negative pressure water supply equipment can be used normally when the municipal water supply network 1 is insufficient, avoiding water outages during peak water usage and thus ensuring water supply capacity. On the other hand, the use of the high-pressure compensation tank 9, the electric three-way valve 17, and the multi-functional pump 18 extends the dormancy time of the variable frequency main pump 13 during the transition period between peak and low water demand, thereby achieving the purpose of energy saving and consumption reduction. Furthermore, the use of the constant pressure tank 11, the electric three-way valve 17, and the multi-functional pump 18 allows the variable frequency main pump 13 to remain in a long-term dormant state during periods of low water demand, thereby greatly reducing the operating energy consumption of the equipment and improving the operating efficiency of the equipment.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water supply method based on a tank-type negative pressure-free water supply device, wherein the water supply device is connected between a municipal water supply network and a main outlet pipe, characterized in that, Including: A constant pressure tank, which is connected to the municipal pipe network; A variable frequency main pump, which is connected between the constant pressure tank and the outlet main pipe; A high-pressure compensation tank, which is connected to the outlet main pipe; A multi-functional pump, which has a first end and a second end. The first end is connected to the constant pressure tank, and the second end is connected to the high-pressure compensation tank; A three-way valve, which has a first interface, a second interface and a third interface. The first interface is connected to the first end of the multi-functional pump, the second interface is respectively connected to the second end of the multi-functional pump and the high-pressure compensation tank, and the third interface is connected to the outlet main pipe; The water supply method includes the following steps: S1: Set a preset threshold PT1 for the outlet main pipe, a preset threshold PT2 for the high-pressure compensation tank, and a preset threshold PT3 for the municipal pipe network, where PT2≥PT1>PT3; Set the idle time interval and the busy time interval; S2: When the pressure value P1 of the outlet main pipe <PT1 or the pressure value P3 of the municipal pipe network <PT3, the pressure value P2 of the high-pressure compensation tank is greater than the pressure value P3 of the municipal pipe network, and the time is in the busy time interval, execute the peak water supply plan; S3: When the pressure value P3 of the municipal pipe network ≥PT3 and the pressure value P2 of the high-pressure compensation tank <PT2, execute the normal water supply plan; S4: When the pressure value P3 of the municipal pipe network ≥PT3, the pressure value P2 of the high-pressure compensation tank ≥PT2, the pressure value P1 of the outlet main pipe ≥PT1, and the time is in the busy time interval, execute the instantaneous small flow water supply plan; S5: When the pressure value P3 of the municipal pipe network ≥PT3, the pressure value P2 of the high-pressure compensation tank ≥PT2, and the time is in the idle time interval, execute the idle small flow water supply plan.

2. The water supply method according to claim 1, characterized in that, It further includes a first pressure sensor, a second pressure sensor and a third pressure sensor. The first pressure sensor is arranged on the outlet main pipe, the second pressure sensor is arranged at the water inlet end of the high-pressure compensation tank, and the third pressure sensor is arranged at the municipal pipe network.

3. The water supply method according to claim 1, characterized in that, It further includes a first pressure reducing valve and a second pressure reducing valve. The first pressure reducing valve is arranged between the high-pressure compensation tank and the outlet main pipe, and the second pressure reducing valve is arranged between the first pressure reducing valve and the municipal pipe network.

4. The water supply method according to claim 1, wherein A reducing joint is arranged between the variable frequency main pump and the constant pressure tank, and a first check valve is arranged between the variable frequency main pump and the outlet main pipe.

5. The water supply method according to claim 3, characterized in that, The peak water supply plan in S2 specifically includes: S21: Connect the second interface and the third interface of the three-way valve; S22: Connect the high-pressure compensation tank and the municipal pipe network, so that the water in the high-pressure compensation tank flows into the municipal pipe network and then into the constant pressure tank; S23: Start the variable frequency main pump at a reduced frequency, and pump the water in the constant pressure tank to the outlet main pipe.

6. The water supply method according to claim 5, characterized in that, The connection of the high-pressure compensation tank and the municipal pipe network in S22 further includes: S221: Open the first pressure reducing valve, so that the water in the high-pressure compensation tank flows into the outlet main pipe until the pressure difference between the high-pressure compensation tank and the first pressure reducing valve is equal to the pressure value of the outlet main pipe; S222: Open the second pressure reducing valve to connect the high-pressure compensation tank and the municipal pipeline network.

7. The water supply method according to claim 1, characterized in that, The normal water supply scheme in S3 specifically includes: S31: Connect the first port of the three-way valve to the third port; S32: Start the variable frequency main pump to pressurize and pump the water in the constant pressure tank to the main outlet pipe; S33: Turn on the multi-functional pump to pump part of the water in the main outlet pipe to the high-pressure compensation tank for storage and standby, until the pressure value P2 of the high-pressure compensation tank is greater than or equal to PT2.

8. The water supply method according to claim 5, characterized in that, The instantaneous low-flow water supply scheme in S4 includes: S41: Connect the first port of the three-way valve to the third port; S42: Turn off the variable frequency main pump, connect the high pressure compensation tank and the main outlet pipe, and supply water to the main outlet pipe through the high pressure compensation tank until the pressure difference between the high pressure compensation tank and the main outlet pipe reaches the preset value; S43: Start the normal water supply program until the pressure value P1 of the main water outlet pipe is greater than or equal to PT1 and the pressure value P2 of the high-pressure compensation tank is greater than or equal to PT2. S44: Repeat steps S41 to S43.

9. The water supply method according to claim 8, characterized in that, In S41, the connection between the high-pressure compensation tank and the main outlet pipe includes: S411: Open the first pressure reducing valve to allow the water in the high-pressure compensation tank to be reduced in pressure and then compensated to the main outlet pipe until the pressure difference between the high-pressure compensation tank and the first pressure reducing valve is the same as the pressure value of the main outlet pipe.

10. The water supply method according to claim 3, characterized in that, The off-peak low-flow water supply scheme in S5 includes: S51: Turn off the variable frequency main pump and the multi-functional pump, connect the high pressure compensation tank and the main outlet pipe, and supply water to the main outlet pipe through the high pressure compensation tank until the pressure values ​​of the high pressure compensation tank and the main outlet pipe are the same; S52: Connect the second and third ports of the three-way valve, and turn on the multi-functional pump to pump the low-pressure water in the constant pressure tank to the main outlet pipe.

11. The water supply method according to claim 10, characterized in that, S51, connecting the high-pressure compensation tank and the main outlet pipe, includes supplying water to the main outlet pipe through the high-pressure compensation tank: S511: If the pressure difference between the high-pressure compensation tank and the first pressure reducing valve is greater than the pressure value of the main water outlet pipe, then proceed to step S512; otherwise, proceed to step S513. S512: Connect the first port and the third port of the three-way valve; open the first pressure reducing valve so that the water in the high pressure compensation tank flows into the main outlet pipe after passing through the first pressure reducing valve, until the pressure difference between the high pressure compensation tank and the first pressure reducing valve is the same as the pressure of the main outlet pipe, and execute step S513; S513: Connect the second and third ports of the three-way valve so that the water in the high-pressure compensation tank flows directly into the main outlet pipe until the pressure value of the high-pressure compensation tank is the same as the pressure of the main outlet pipe.

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