CN111764468A - No negative pressure secondary water supply equipment - Google Patents
No negative pressure secondary water supply equipment Download PDFInfo
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- CN111764468A CN111764468A CN202010714137.9A CN202010714137A CN111764468A CN 111764468 A CN111764468 A CN 111764468A CN 202010714137 A CN202010714137 A CN 202010714137A CN 111764468 A CN111764468 A CN 111764468A
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- water
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- negative pressure
- water supply
- main pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 237
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 239000008400 supply water Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/02—Public or like main pipe systems
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a negative-pressure-free secondary water supply device. The backflow preventer comprises a water inlet main pipe, wherein a pressure transmitter and a backflow preventer are arranged on the water inlet main pipe; the first non-negative pressure tank comprises a first tank body and a central pipe, wherein the central pipe is provided with a small hole, and an elastic bag is sleeved outside the central pipe; the main water supply assembly comprises a first pipeline, and a plurality of first branches and a first variable frequency water pump are communicated with the first pipeline; the auxiliary water supply assembly comprises a second pipeline, and a bidirectional converter is arranged on the conversion branch; one end of the second pipeline is provided with a second non-negative pressure tank, and a second variable frequency water pump is arranged on the second pipeline; the second non-negative pressure tank comprises a second tank body, and the second tank body is divided into a second air cavity with the upper part sealed and a water cavity with the lower part through an elastic membrane; the water outlet main pipe is provided with a pressure transmitter and an electric contact pressure gauge; and (5) controlling the system. The pressure of the water inlet end and the water outlet end of the device can be kept constant, the water supply quantity can be adaptively adjusted according to the water consumption of a user, and the energy is saved.
Description
Technical Field
The invention relates to a negative-pressure-free secondary water supply device.
Background
With the acceleration of the urbanization process, more and more people live in high-rise residences, and the primary water source of a water works cannot be sent to high-rise users, so that secondary water supply equipment is needed.
No negative pressure secondary water supply equipment is the secondary pressure boost water supply equipment that directly links to each other with the municipal pipe network, and it is when moving, requires no matter any situation can not influence the municipal pipe network, simultaneously, for making user experience feel better, the play water pressure of equipment also need invariable, can not have great shock. At present, the non-negative pressure secondary water supply equipment has a simple structure, and adopts a mode of cutting off a water source to prevent the equipment from generating negative pressure on a pipe network. Moreover, when the water supply device is used, even when the water consumption of a user is small, the large water pump needs to be started for water supply, the service life of the device is short, the frequent starting of the large pump still causes the problem of electricity consumption, the energy utilization rate is low, and the user experience is poor.
Disclosure of Invention
The invention aims to provide the negative pressure-free secondary water supply equipment which can keep the pressure of the water inlet end and the water outlet end of the equipment constant, can adaptively adjust the water supply amount according to the water consumption of a user, does not need to frequently start a large pump and is relatively energy-saving.
In order to achieve the purpose, the non-negative-pressure secondary water supply equipment adopts the following technical scheme: the non-negative pressure secondary water supply equipment comprises:
the water inlet pipeline assembly comprises a water inlet main pipe communicated with the municipal pipe network, and the water inlet main pipe is provided with a pressure transmitter and a backflow preventer;
the first non-negative pressure tank is arranged on the water inlet main pipe and comprises a closed first tank body and a central pipe penetrating through the first tank body, the upper end of the central pipe is communicated with the water inlet main pipe, a plurality of small holes are formed in the central pipe at intervals, an elastic bag is further sleeved outside the central pipe, two ends of the elastic bag are hermetically fixed at two ends of the central pipe, the small holes are located in the elastic bag, and a closed first air cavity is formed between the elastic bag and the first tank body;
the main water supply assembly comprises a first pipeline communicated with the lower end of the central pipe, a plurality of first branches are communicated on the first pipeline, and a first variable frequency water pump is arranged on each first branch;
the auxiliary water supply assembly comprises a second pipeline, the first pipeline is connected with the second pipeline through a conversion branch, and a bidirectional converter is arranged on the conversion branch; one end of the second pipeline is provided with a second non-negative pressure tank, and a second variable frequency water pump is arranged on the second pipeline; the second non-negative pressure tank comprises a second tank body, the lower part of the second tank body is provided with a tank body conduction opening communicated with the second pipeline, and the second tank body is internally divided into a second air cavity with the sealed upper part and a water cavity with the sealed lower part by an elastic membrane;
the water outlet pipeline assembly comprises a water outlet main pipe communicated with a user pipe network, a pressure transmitter and an electric contact pressure gauge are arranged on the water outlet main pipe, one end of the second pipeline, which is far away from the second non-negative pressure tank, is communicated with the water outlet main pipe, and one end of each first branch, which is far away from the first pipeline, is communicated with the water outlet main pipe;
and the control system comprises a PLC and a man-machine interaction module, and each pressure transmitter, each first variable frequency water pump, each second variable frequency water pump, the electric contact pressure gauge and the bidirectional converter are in control connection with the PLC.
On the basis of the scheme, the air conditioner is further improved in the following mode, and inert gas is filled in the first air cavity and/or the second air cavity.
On the basis of the scheme, the bidirectional converter is further improved to be an electric valve so as to be convenient to control.
On the basis of the scheme, the method is further improved in that the first branch has three branches.
On the basis of the scheme, the water inlet main pipe and the water outlet main pipe are further improved to be provided with manual stop valves respectively so as to be operated manually when a circuit fails, and safety is ensured.
On the basis of the scheme, the elastic bag and the elastic film are made of elastic rubber.
On the basis of the scheme, the method is further improved in the following way, the aperture of the small hole in the central tube is 10mm, and the distance between two adjacent small holes is 20 mm.
The invention has the beneficial effects that: (1) the pressure of the water inlet end and the water outlet end is constant, and the booster water pump has the function of amplifying oscillation, and the amplification factor can reach 30 times, so that even if the water inlet end has small pressure oscillation, the water outlet end can be greatly oscillated after the water pump amplifies the pressure oscillation, the problem cannot be well solved in the prior art, the water pressure is unstable when a user uses the water pump, and the user experience is seriously influenced; the second non-negative pressure tank is arranged, so that water pressure fluctuation in the second pipeline and the water outlet main pipe can be eliminated through reciprocating vibration of the elastic membrane, meanwhile, the water pressure in the water outlet main pipe is monitored by using the pressure transmitter and the electric contact pressure gauge, and the pumping capacity of each variable frequency water pump is controlled by the controller to be adjusted, so that the pressure at the water outlet end is ensured to be constant, and a user can have good water use experience; (2) the water consumption of a user is replaced by a plurality of small pumps, a main and auxiliary water supply assembly, a variable frequency water pump, a first non-negative pressure tank and a second non-negative pressure tank with water storage functions from an original simple extensive mode of directly supplying water by a large pump, so that the equipment is shut down and pressure is maintained when the water consumption of the user is particularly small; when the user begins to use water, the equipment is not started, and the water stored in the second non-negative pressure tank is released for use; thirdly, the water consumption of the user is continuously increased and is smaller than the set flow, the bidirectional converter is opened, and the second variable frequency water pump of the auxiliary water supply assembly is opened to take water from the first non-negative pressure tank to supply the water to the user; when the water consumption of a user is continuously increased and is larger than the set flow, the second variable frequency water pump is stopped, and a plurality of first variable frequency water pumps of the main water supply assembly are switched to supply water; therefore, the scheme of the invention is not a single extensive water supply mode but a more detailed and intelligent water supply mode during water supply, the water supply quantity is adaptively adjusted according to the water consumption quantity of a user, the mode is more energy-saving and has high energy utilization rate, the starting times of the large pump are reduced, and the service life of the equipment is obviously prolonged.
Drawings
FIG. 1 is a schematic view of the system of a non-negative pressure secondary water supply apparatus of the present invention;
FIG. 2 is a schematic view of the first non-negative pressure tank;
FIG. 3 is a schematic structural view of a second non-negative pressure tank;
in the figure: 1-a main water inlet pipe, 2-a first pressure transmitter, 3-a backflow preventer, 4-a second pressure transmitter, 5-a first no negative pressure tank, 51-a first tank body, 52-a central pipe, 521-a small hole, 53-an elastic bag, 54-a first air cavity, 6-a second no negative pressure tank, 61-a second tank body, 62-an elastic membrane, 63-a second air cavity, 64-a water cavity, 65-a tank body conduction port, 7-a bidirectional converter, 8-a first pipeline, 81-a first branch, 9-a first variable frequency water pump, 11-a conversion branch, 12-a second variable frequency water pump, 13-a third pressure transmitter, 14-an electric contact pressure gauge, 15-a second pipeline, 17-a main water outlet pipe and 18-a manual stop valve.
Detailed Description
As shown in fig. 1 to 3, the non-negative pressure secondary water supply apparatus according to the present invention includes:
the water inlet pipeline assembly comprises a water inlet main pipe 1 communicated with the municipal pipe network, and a pressure transmitter and a backflow preventer 3 are arranged on the water inlet main pipe 1.
The first non-negative pressure tank 5 is arranged on the water inlet main pipe 1 and comprises a first closed tank body 51 and a central pipe 52 penetrating through the first tank body 51, the upper end of the central pipe 52 is communicated with the water inlet main pipe 1, a plurality of small holes 521 are formed in the central pipe 52 at intervals, an elastic bag 53 is further sleeved outside the central pipe 52, two ends of the elastic bag 53 are fixed at two ends of the central pipe 52 in a sealing mode, the small holes 521 are located in the elastic bag 53, and a first closed air cavity 54 is formed between the elastic bag 53 and the first tank body 51 in a surrounding mode.
The main water supply assembly comprises a first pipeline 8 communicated with the lower end of the central pipe 52, a plurality of first branches 81 are communicated on the first pipeline 8, and a first variable frequency water pump 9 is respectively arranged on each first branch 81.
The auxiliary water supply assembly comprises a second pipeline 15, the first pipeline 8 is connected with the second pipeline 15 through a conversion branch 11, and a bidirectional converter 7 is arranged on the conversion branch 11; one end of the second pipeline 15 is provided with a second non-negative pressure tank 6, and the second pipeline 15 is provided with a second variable frequency water pump 12; the second non-negative pressure tank 6 includes a second tank 61, a tank conduction port 65 communicating with the second pipeline 15 is provided at a lower portion of the second tank 61, and the second tank 61 is partitioned into a second air chamber 63 having a sealed upper portion and a water chamber 64 having a lower portion by an elastic membrane 62 inside the second tank 61.
The water outlet pipeline assembly comprises a water outlet main pipe 17 communicated with a user pipe network, a pressure transmitter and an electric contact pressure gauge 14 are arranged on the water outlet main pipe 17, one end of the second pipeline 15, which is far away from the second non-negative pressure tank 6, is communicated with the water outlet main pipe 17, and one end of each first branch 81, which is far away from the first pipeline 8, is communicated with the water outlet main pipe 17.
The control system comprises a PLC and a man-machine interaction module, and each pressure transmitter, each first variable frequency water pump 9, each second variable frequency water pump 12, an electric contact pressure gauge 14 and the bidirectional converter 7 are connected with the PLC in a control mode.
More specifically, the first air chamber 54 and the second air chamber 63 are filled with inert gas. The bidirectional converter 7 is an electric valve for convenient control. The first branch 81 has three. The water inlet main pipe 1 and the water outlet main pipe 17 are respectively provided with a manual stop valve 18 so as to be manually operated when a circuit is failed, and the safety is ensured. The elastic bag 53 and the elastic film 62 are made of elastic rubber. The diameter of the small holes 521 on the central tube 52 is 10mm, and the distance between two adjacent small holes 521 is 20 mm.
The non-negative-pressure secondary water supply equipment utilizes the frequency converter to adjust the three first variable-frequency water pumps 9 so as to meet the water consumption of a user and realize the amount of water supplied by the user; the first non-negative pressure tank 5 is utilized to avoid the influence of equipment on the municipal pipe network, so that the purpose of non-negative pressure is achieved; the first non-negative pressure tank 5 is utilized to solve the problem of pressure fluctuation of the water inlet of the water pump so as to stabilize the pressure of the water outlet end of the water pump; the second pipeline 15 is connected with the second non-negative pressure tank 6, and the second non-negative pressure tank 6 eliminates pressure oscillation on the second pipeline 15 in real time to ensure stable pressure of the main water outlet pipe 17.
The invention relates to non-negative-pressure secondary water supply equipment which comprises a first non-negative-pressure tank 5, a municipal pipe network, a first variable-frequency water pump 9, a second pipeline 15 and a user pipe network, wherein a water inlet of the first non-negative-pressure tank 5 is connected with the municipal pipe network, a water inlet end of the first variable-frequency water pump 9 is connected with a water outlet of the first non-negative-pressure tank 5, a water outlet end of the first variable-frequency water pump 9 is connected with a water outlet main pipe 17, and the water outlet main pipe 17 is connected with the user pipe network.
The first pressure transmitter 2 monitors the pressure of the municipal pipe network in real time, and the normal water supply mode is judged when the pressure fluctuation is +/-0.05 MPa. At the moment, water in the municipal pipe network enters the first non-negative pressure tank 5 and is pressurized by the three first variable frequency water pumps 9 to supply water to the user pipe network.
Backflow preventer 3 is installed on the municipal pipe network, and water with pressure in first no negative pressure tank 5 is prevented from flowing back to the municipal pipe network, so that influence on the municipal pipe network is avoided.
And a third pressure transmitter 13 and an electric contact pressure gauge 14 are installed on the water outlet main pipe 17. The third pressure transmitter 13 monitors the water pressure in the main water outlet pipe 17 in real time and transmits the water pressure to the PLC in the control cabinet; when the water consumption is increased, the PLC increases the rotating speed of the three first variable-frequency water pumps 9 through the frequency converter in the control cabinet, increases the water supply amount and ensures the constant pressure; when the flow of one first variable-frequency water pump 9 is insufficient, two variable-frequency water pumps are selected, and if the flow of one first variable-frequency water pump is insufficient, three first variable-frequency water pumps are selected; when the water consumption is reduced, the PLC reduces the rotating speed of the first variable-frequency water pump 9 through a frequency converter in the control cabinet, reduces the water supply amount and ensures the constant pressure; constant-pressure water supply can also be realized by reducing the number of the first variable-frequency water pumps 9. And the frequency converters in the control cabinet correspond to the variable-frequency water pumps one by one.
When the electric contact pressure gauge 14 detects that the pressure on the water outlet main pipe 17 is lower than or higher than the set pressure, the three first variable frequency water pumps 9 stop operating.
The second non-negative pressure tank 6 is connected with a main water outlet pipe 17 through a second pipeline 15. In the case of normal water supply, the bidirectional converter 7 (corresponding to a stop valve) is closed, the passages of the first non-negative pressure tank 5 and the second non-negative pressure tank 6 are cut off, and water with pressure in the water outlet main pipe 17 is stored in the second non-negative pressure tank 6 through the second pipeline 15. When the water consumption of the user is small, the equipment is stopped and pressure is maintained. When the user starts to use water again, the device does not need to be started, and the water with pressure stored in the second non-negative pressure tank 6 is released to the second pipeline 15, so that the normal water use of the user is ensured. The user water consumption lasts the increase, and is less than when setting for the flow, opens bidirectional converter 7, and second frequency conversion water pump 12 begins work, supplies with the user from first no negative pressure jar 5 water intaking, and when the user water consumption lasts the increase, and is greater than when setting for the flow, second frequency conversion water pump 12 stop work switches to first frequency conversion water pump 9 and operates.
The pressure of the water inlet end and the water outlet end is constant, and the booster water pump has the function of amplifying oscillation, and the amplification factor can reach 30 times, so that even if the water inlet end has small pressure oscillation, the water outlet end can be greatly oscillated after the water pump amplifies the pressure oscillation, the problem cannot be well solved in the prior art, the water pressure is unstable when a user uses the booster water pump, and the user experience is seriously influenced; the second no negative pressure jar 6 sets up, then can eliminate the water pressure fluctuation in second pipeline 15 and the play water main pipe 17 through the reciprocal vibrations of elastic membrane 62, simultaneously, utilizes pressure transmitter and electric contact pressure gauge 14 to monitor the interior water pressure of the play water main pipe 17 to through the adjustment that each variable frequency water pump of controller control carried out pumping capacity, finally ensured the pressure of a water end invariable, ensured that the user can possess fine water experience.
The water consumption of a user is replaced by a plurality of small pumps, main and auxiliary water supply components, a variable frequency water pump and a first non-negative pressure tank 6 and a second non-negative pressure tank 6 with water storage functions from an original simple extensive mode of directly supplying water by a large pump, so that the equipment is shut down and pressure is maintained when the water consumption of the user is particularly small; when the user begins to use water, the equipment is not started, but is released for use by depending on the water stored in the second non-negative pressure tank 6; thirdly, continuously increasing the water consumption of the user and enabling the water consumption to be smaller than the set flow, opening the bidirectional converter 7, and opening the second variable frequency water pump 12 of the auxiliary water supply assembly to take water from the first non-negative pressure tank 5 and supply the water to the user; fourthly, when the water consumption of the user is continuously increased and is larger than the set flow, the second variable frequency water pump 12 is stopped, and a plurality of first variable frequency water pumps 9 of the main water supply assembly are switched to supply water; therefore, the scheme of the invention is not a single extensive water supply mode but a more detailed and intelligent water supply mode during water supply, the water supply quantity is adaptively adjusted according to the water consumption quantity of a user, the mode is more energy-saving and has high energy utilization rate, the starting times of the large pump are reduced, and the service life of the equipment is obviously prolonged.
Claims (7)
1. There is not negative pressure secondary water supply equipment, its characterized in that includes:
the water inlet pipeline assembly comprises a water inlet main pipe communicated with the municipal pipe network, and the water inlet main pipe is provided with a pressure transmitter and a backflow preventer;
the first non-negative pressure tank is arranged on the water inlet main pipe and comprises a closed first tank body and a central pipe penetrating through the first tank body, the upper end of the central pipe is communicated with the water inlet main pipe, a plurality of small holes are formed in the central pipe at intervals, an elastic bag is further sleeved outside the central pipe, two ends of the elastic bag are hermetically fixed at two ends of the central pipe, the small holes are located in the elastic bag, and a closed first air cavity is formed between the elastic bag and the first tank body;
the main water supply assembly comprises a first pipeline communicated with the lower end of the central pipe, a plurality of first branches are communicated on the first pipeline, and a first variable frequency water pump is arranged on each first branch;
the auxiliary water supply assembly comprises a second pipeline, the first pipeline is connected with the second pipeline through a conversion branch, and a bidirectional converter is arranged on the conversion branch; one end of the second pipeline is provided with a second non-negative pressure tank, and a second variable frequency water pump is arranged on the second pipeline; the second non-negative pressure tank comprises a second tank body, the lower part of the second tank body is provided with a tank body conduction opening communicated with the second pipeline, and the second tank body is internally divided into a second air cavity with the sealed upper part and a water cavity with the sealed lower part by an elastic membrane;
the water outlet pipeline assembly comprises a water outlet main pipe communicated with a user pipe network, a pressure transmitter and an electric contact pressure gauge are arranged on the water outlet main pipe, one end of the second pipeline, which is far away from the second non-negative pressure tank, is communicated with the water outlet main pipe, and one end of each first branch, which is far away from the first pipeline, is communicated with the water outlet main pipe;
and the control system comprises a PLC and a man-machine interaction module, and each pressure transmitter, each first variable frequency water pump, each second variable frequency water pump, the electric contact pressure gauge and the bidirectional converter are in control connection with the PLC.
2. The non-negative pressure secondary water supply apparatus according to claim 1, wherein the first air chamber and/or the second air chamber is filled with inert gas.
3. The non-negative pressure secondary water supply apparatus as claimed in claim 1, wherein the bidirectional converter is an electric valve.
4. The non-negative pressure secondary water supply apparatus as claimed in claim 1, wherein the first branch has three branches.
5. The non-negative pressure secondary water supply equipment according to claim 1, wherein manual cut-off valves are respectively installed on the water inlet main pipe and the water outlet main pipe.
6. The non-negative pressure secondary water supply equipment according to claim 1, wherein the elastic bag and the elastic membrane are made of elastic rubber.
7. The non-negative pressure secondary water supply equipment according to claim 1, wherein the diameter of the small hole on the central pipe is 10mm, and the distance between two adjacent small holes is 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010714137.9A CN111764468A (en) | 2020-07-23 | 2020-07-23 | No negative pressure secondary water supply equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010714137.9A CN111764468A (en) | 2020-07-23 | 2020-07-23 | No negative pressure secondary water supply equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111764468A true CN111764468A (en) | 2020-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010714137.9A Pending CN111764468A (en) | 2020-07-23 | 2020-07-23 | No negative pressure secondary water supply equipment |
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| Country | Link |
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| CN (1) | CN111764468A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113957954A (en) * | 2021-11-16 | 2022-01-21 | 无锡汇田水务科技有限公司 | Energy-saving non-negative pressure water supply equipment and automatic energy optimization method thereof |
| CN114477581A (en) * | 2022-02-17 | 2022-05-13 | 陆科栋 | Urban and rural global or regional direct drinking water supply method |
-
2020
- 2020-07-23 CN CN202010714137.9A patent/CN111764468A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113957954A (en) * | 2021-11-16 | 2022-01-21 | 无锡汇田水务科技有限公司 | Energy-saving non-negative pressure water supply equipment and automatic energy optimization method thereof |
| CN114477581A (en) * | 2022-02-17 | 2022-05-13 | 陆科栋 | Urban and rural global or regional direct drinking water supply method |
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