CN113216326B - Non-negative pressure water supply equipment with night small-flow function and water supply method - Google Patents
Non-negative pressure water supply equipment with night small-flow function and water supply method Download PDFInfo
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- CN113216326B CN113216326B CN202110629069.0A CN202110629069A CN113216326B CN 113216326 B CN113216326 B CN 113216326B CN 202110629069 A CN202110629069 A CN 202110629069A CN 113216326 B CN113216326 B CN 113216326B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 496
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 20
- 238000004146 energy storage Methods 0.000 claims description 6
- 239000008400 supply water Substances 0.000 claims description 6
- 230000006837 decompression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- 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
- E03B11/02—Arrangements or adaptations of tanks for water supply for domestic or like local water supply
- E03B11/06—Arrangements or adaptations of tanks for water supply for domestic or like local water supply with air regulators
- E03B11/08—Air regulators
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- 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
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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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
- E03B7/07—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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- 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
- E03B7/09—Component parts or accessories
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
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- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses non-negative pressure water supply equipment with a night small-flow function and a water supply method, wherein the water supply equipment comprises a water inlet pipe, a steady flow tank, a water pump water inlet main pipe, a frequency conversion unit, a water pump water outlet main pipe and a water supply pipe which are sequentially connected; the high-pressure maintaining tank is internally provided with an energy accumulator and is connected with the steady flow tank through a water filling pipe; a water inlet pipe and a water outlet pipe are connected between the water supply pipe and the high-pressure maintaining tank, a first electromagnetic valve is arranged on the water outlet pipe, and a fifth electromagnetic valve and a first check valve are arranged on the water inlet pipe; and a pressure compensating pipe is also connected between the high-pressure maintaining tank and the flow stabilizing tank, and a pressure reducing valve and a sixth electromagnetic valve are arranged on the pressure compensating pipe. The water supply device without negative pressure is characterized in that a steady flow tank and a frequency conversion unit are used for supplying water to users in a normal state, the steady flow tank is subjected to differential compensation through a high-pressure maintaining tank and a pressure compensating pipe when the water consumption is high, and the high-pressure maintaining tank is used for supplying water when the water consumption is reduced at night, so that the frequent starting of a pump is reduced.
Description
Technical Field
The invention belongs to the technical field of municipal water supply, and particularly relates to non-negative-pressure water supply equipment with a night small-flow function and a water supply method.
Background
Secondary pressurization water supply equipment is more and more applied to high-rise water supply, and no negative pressure water supply equipment adopts stationary flow jar structure alone basically, and when the municipal water volume of coming is less than user's water consumption when the water peak, can't satisfy the water demand. When the flow is in a small flow state at night, if a frequency conversion water pump frequent starting mode is adopted, the water pump runs at a low frequency, the efficiency is low, and even a motor is burnt out; if the frequency-up operation is carried out on the variable-frequency water pump, the motor is easy to cause overcurrent and even burnout; if the form of arranging the booster pump is adopted, the structure of the water supply equipment is complex, and the cost of the water supply equipment is increased.
Disclosure of Invention
Aiming at the defects, the invention provides non-negative pressure water supply equipment with a night small flow function and a water supply method, so that time difference compensation during peak water consumption and high pressure maintaining at night with small flow are realized, the compensation amount is effectively increased, and the frequent starting of a water pump is reduced.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme: on one hand, the embodiment of the invention provides non-negative pressure water supply equipment with a night small flow function, which comprises a water inlet pipe, a flow stabilizing tank, a water pump water inlet main pipe, a frequency conversion unit, a water pump water outlet main pipe and a water supply pipe which are sequentially connected; the high-pressure maintaining tank is internally provided with an energy accumulator and is connected with the steady flow tank through a water filling pipe; a water inlet pipe and a water outlet pipe are connected between the water supply pipe and the high-pressure maintaining tank, a first electromagnetic valve is arranged on the water outlet pipe, and a fifth electromagnetic valve and a first check valve are arranged on the water inlet pipe; and a pressure compensating pipe is also connected between the high-pressure maintaining tank and the flow stabilizing tank, and a pressure reducing valve and a sixth electromagnetic valve are arranged on the pressure compensating pipe.
As a further improvement of the embodiment of the invention, the frequency conversion unit comprises at least two groups of water pump units, and the water pump units are arranged between a water pump water inlet main pipe and a water pump water outlet main pipe in parallel.
As a further improvement of the embodiment of the invention, the water pump unit comprises a water pipe, wherein a water inlet of the water pipe is connected with a water inlet main pipe of the water pump, and a water outlet of the water pipe is connected with a water outlet main pipe of the water pump; the water pipe is sequentially provided with a second butterfly valve, a variable frequency water pump, a second check valve and a first butterfly valve, the second butterfly valve is located at the water inlet of the water pipe, and the first butterfly valve is located at the water outlet of the water pipe.
As a further improvement of the embodiment of the invention, the frequency conversion unit comprises a first water pump unit, a second water pump unit and a first bypass pipe, and a fourth electromagnetic valve is arranged on the first bypass pipe; the water inlet of the first bypass pipe is connected with the water outlet main pipe of the water pump, the joint of the first bypass pipe and the water outlet main pipe of the water pump is positioned between the joint of the first water pump unit and the water outlet main pipe of the water pump and the joint of the second water pump unit and the water outlet main pipe of the water pump, and the water outlet of the first bypass pipe is connected with the inlet of the variable frequency water pump of the second water pump unit; and a third electromagnetic valve is arranged on the water outlet main pipe of the water pump and is positioned between the joint of the first bypass pipe and the water outlet main pipe of the water pump and the joint of the second water pump unit and the water outlet main pipe of the water pump.
As a further improvement of the embodiment of the present invention, the water supply pipe is provided with a second electromagnetic valve, and the second electromagnetic valve is located between a connection position of the water supply pipe and the water inlet pipe and a connection position of the water supply pipe and the water outlet pipe.
As a further improvement of the embodiment of the present invention, a first pressure sensor is disposed on the water inlet pipe.
As a further improvement of the embodiment of the present invention, a second pressure sensor is provided on the pressure compensation pipe.
On the other hand, the embodiment of the invention also provides a non-negative pressure water supply method with a night small flow function, which adopts the non-negative pressure water supply equipment with the night small flow function; the method comprises the following steps:
step 10) starting the variable frequency water pumps of the variable frequency unit, connecting a plurality of variable frequency water pumps in a parallel state, and inputting incoming water into a water supply pipe through the steady flow tank and the variable frequency unit for water supply;
step 20), when the pressure of the incoming water pipe network reaches a limit value, opening a sixth electromagnetic valve, and performing differential compensation on the flow stabilizing tank after the pressure of the high-pressure maintaining tank is reduced by a pressure reducing valve;
step 30) when the water consumption of the user pipe network at night is reduced, the variable frequency water pump is closed, the first electromagnetic valve is opened, the compressed air in the energy storage device is expanded, and the water is pressed into the water supply pipe to supply water;
and step 40) when the pressure of the high-pressure maintaining tank is detected to be lower than a set value, starting the variable-frequency water pumps, connecting the variable-frequency water pumps in a serial state, inputting the input water into the high-pressure maintaining tank after the pressure of the multiple variable-frequency water pumps in the serial state is increased, and closing the variable-frequency water pumps until the pressure in the high-pressure maintaining tank reaches the set value.
As a further improvement of the embodiment of the present invention, the step 40) specifically includes:
when the second pressure sensor detects that the pressure of the high-pressure maintaining tank is lower than a set value, a second butterfly valve of a second frequency conversion unit is closed, two frequency conversion water pumps are started, a fourth electromagnetic valve, a fifth electromagnetic valve and a first electromagnetic valve are opened, the second electromagnetic valve and the third electromagnetic valve are closed, and the effluent of the two frequency conversion water pumps connected in series enters the high-pressure maintaining tank through a first check valve and the fifth electromagnetic valve and then enters a water supply pipe through the first electromagnetic valve; and when the pressure of the high-pressure maintaining tank reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve and the fifth electromagnetic valve are closed, and water is supplied from the high-pressure maintaining tank.
As a further improvement of the embodiment of the present invention, step 40) specifically includes:
when the second pressure sensor detects that the pressure of the high-pressure maintaining tank is lower than a set value, a second butterfly valve of a second frequency conversion unit is closed, two frequency conversion water pumps are started, a fourth electromagnetic valve, a fifth electromagnetic valve and a second electromagnetic valve are opened, the first electromagnetic valve and the third electromagnetic valve are closed, the water outlet of the two frequency conversion water pumps connected in series is divided into two paths, the first path enters the high-pressure maintaining tank through a first check valve and the fifth electromagnetic valve, and the second path directly enters a water supply pipe through the second electromagnetic valve; when the pressure of the high-pressure maintaining tank reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve, the fifth electromagnetic valve and the second electromagnetic valve are closed, the first electromagnetic valve is opened, then the water enters the water supply pipe through the first electromagnetic valve, and water is supplied by the high-pressure maintaining tank.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the non-negative-pressure water supply equipment with the night small-flow function and the water supply method, water is supplied to a user by the flow stabilizing tank and the frequency conversion unit under a normal state, the flow stabilizing tank is subjected to differential compensation through the high-pressure maintaining tank and the pressure compensating pipe when the water consumption is high, water is supplied through the high-pressure maintaining tank when the water consumption is reduced at night, and the frequent starting of a water pump is reduced.
Drawings
Fig. 1 is a schematic structural view of a non-negative pressure water supply apparatus with a night low flow function according to an embodiment of the present invention.
The figure shows that: the variable-frequency water pump comprises a water inlet pipe 1, a first pressure sensor 2, a steady flow tank 3, a vacuum suppressor 4, a pressure reducing valve 5, a second pressure sensor 6, a high-pressure maintaining tank 7, an energy storage device 71, a first electromagnetic valve 9, a first check valve 10, a water supply pipe 11, a second electromagnetic valve 12, a third electromagnetic valve 13, a fourth electromagnetic valve 14, a first butterfly valve 15, a second check valve 16, a variable-frequency water pump 17, a fifth electromagnetic valve 18, a sixth electromagnetic valve 19 and a second butterfly valve 20.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.
The embodiment of the invention provides non-negative pressure water supply equipment with a small flow function at night, which comprises a water inlet pipe 1, a steady flow tank 3, a water pump water inlet main pipe, a frequency conversion unit, a water pump water outlet main pipe and a water supply pipe 11, wherein the water inlet of the water inlet pipe 1 is connected with a municipal water inlet pipe network, the water outlet of the water inlet pipe 1 is connected with the water inlet of the steady flow tank 3, the water outlet of the steady flow tank 3 is connected with the water inlet of the frequency conversion unit through the water pump water inlet main pipe, the water outlet of the frequency conversion unit is connected with the water inlet of the water supply pipe 11 through the water pump water outlet main pipe, and the water outlet of the water supply pipe 11 is connected with a user pipe network, as shown in figure 1. The non-negative pressure water supply equipment of the embodiment further comprises a high-pressure maintaining tank 7, wherein an energy storage device 71 is arranged in the high-pressure maintaining tank 7, and gas with certain pressure is filled in the energy storage device 71. The high-pressure maintaining tank 7 is connected with the flow stabilizing tank 3 through a water filling pipe, the inlet of the water filling pipe is connected with the flow stabilizing tank 3, and the outlet of the water filling pipe is connected with the high-pressure maintaining tank 7. Preferably, the water filling pipe is provided with a check valve which can prevent the water in the high-pressure maintaining tank 7 from flowing back to the flow stabilizing tank 3. A water inlet pipe and a water outlet pipe are connected between the water supply pipe 11 and the high-pressure maintaining tank 7, a first electromagnetic valve 9 is arranged on the water outlet pipe, and a fifth electromagnetic valve 18 and a first check valve 10 are arranged on the water inlet pipe. A pressure compensating pipe is also connected between the high-pressure maintaining tank 7 and the flow stabilizing tank 3, a pressure reducing valve 5 and a sixth electromagnetic valve 19 are arranged on the pressure compensating pipe, a water inlet of the pressure compensating pipe is connected with the high-pressure maintaining tank 7, and a water outlet of the pressure compensating pipe is connected with the flow stabilizing tank 3.
In the non-negative pressure water supply equipment with the night small flow function of the embodiment, the steady flow tank 3 and the frequency conversion unit supply water to the user in a normal state, the high-pressure maintaining tank 7 is arranged in the embodiment, water is filled into the high-pressure maintaining tank 7 through the water filling pipe, and high-pressure water is input into the high-pressure maintaining tank 7 through the water inlet pipe, so that the pressure of the high-pressure maintaining tank 7 reaches a set value. When the water consumption is high, the water volume is insufficient, when the pressure of the water inlet pipe 1 reaches the lowest pressure limit value, the sixth electromagnetic valve 19 is opened, and the high-pressure maintaining tank 7 performs differential compensation on the flow stabilizing tank 3 after the pressure is reduced by the pressure reducing valve 5 through the pressure compensating pipe. When the water consumption of the user pipe network is obviously reduced at night, the frequency conversion unit can be closed, the high-pressure maintaining tank 7 presses water into the water supply pipe 11 through the water outlet pipe, the water is used by the user pipe network at a low flow rate at night, the frequent starting of a water pump in the frequency conversion unit can be reduced, and the energy is saved.
Preferably, the frequency conversion unit comprises at least two groups of water pump units, and the water pump units are connected in parallel between a water pump water inlet main pipe and a water pump water outlet main pipe. At least two groups of water pump units are arranged between the water pump inlet main pipe and the water pump outlet main pipe in parallel, the water pump units are independent, and one or more groups of water pump units can be selected to operate according to actual requirements.
Furthermore, the water pump unit comprises a water pipe, a water inlet of the water pipe is connected with a water inlet main pipe of the water pump, and a water outlet of the water pipe is connected with a water outlet main pipe of the water pump. The water pipe is sequentially provided with a second butterfly valve 20, a variable frequency water pump 17, a second check valve 16 and a first butterfly valve 15, the second butterfly valve 20 is located at the water inlet of the water pipe, and the first butterfly valve 15 is located at the water outlet of the water pipe. And the second butterfly valve 20 is positioned at the upstream of the variable frequency pump 17 and is used for controlling the water inlet flow of the water pipe. The frequency conversion water pump 17 operates, the first butterfly valve 15 is used for controlling water outlet flow and pressure of the water pipe, and the second check valve 16 is used for preventing water backflow of the water pipe when the frequency conversion water pump 17 stops working. On the basis of municipal water supply pipe network pressure, pressure is superposed according to the requirements of users to supply water, and pressurized water supply is carried out according to the principle of how much difference is compensated, so that energy is effectively saved.
Further, the frequency conversion unit comprises a first water pump unit, a second water pump unit and a first bypass pipe, and a fourth electromagnetic valve 14 is arranged on the first bypass pipe. The water inlet of the first bypass pipe is connected with the water pump water outlet main pipe, the joint of the first bypass pipe and the water pump water outlet main pipe is located between the joint of the first water pump unit and the water pump water outlet main pipe and the joint of the second water pump unit and the water pump water outlet main pipe, and the water outlet of the first bypass pipe is connected with the inlet of the variable frequency water pump of the second water pump unit. And a third electromagnetic valve 13 is arranged on the water outlet main pipe of the water pump, and when the third electromagnetic valve 13 is used for pressurizing the variable frequency water pump, high-pressure water cannot flow back to the water pump unit. And the third electromagnetic valve 13 is positioned between the joint of the first bypass pipe and the water outlet main pipe of the water pump and the joint of the second water pump unit and the water outlet main pipe of the water pump.
The non-negative pressure water supply equipment with the night small flow function of the embodiment is characterized in that when high-pressure water is required to be input into the high-pressure maintaining tank 7 to pressurize the high-pressure maintaining tank 7, the fourth electromagnetic valve 14 is opened, the second butterfly valve of the second water pump unit and the third electromagnetic valve 13 on the water outlet main pipe of the water pump are closed, the variable frequency water pump of the first water pump unit and the variable frequency water pump of the second water pump unit are connected in series through the first bypass pipe, and the two variable frequency water pumps connected in series can replace the booster pump. When high-pressure water needs to be input into the high-pressure maintaining tank 7 to pressurize the high-pressure maintaining tank 7, the fourth electromagnetic valve 14 is closed, the second butterfly valve of the second water pump unit and the third electromagnetic valve 13 on the water outlet main pipe of the water pump are opened, and the two variable-frequency water pumps are connected in parallel. This embodiment has the bypass pipe of solenoid valve through the setting, under the different water supply demands, changes the connected mode of two variable frequency water pumps, has simplified water supply equipment's structure, effective reduce cost.
Preferably, the water supply pipe 11 is provided with a second electromagnetic valve 12, and the second electromagnetic valve 12 is located between the connection between the water supply pipe and the water inlet pipe and the connection between the water supply pipe and the water outlet pipe. When the water is normally supplied to the user pipe network, the second electromagnetic valve 12 is opened, and the water output by the frequency conversion unit completely flows into the user pipe network. When high-pressure water needs to be input into the high-pressure maintaining tank 7 to pressurize the high-pressure maintaining tank 7, the second electromagnetic valve 12 is closed, so that the water pressurized by the frequency conversion unit does not flow into a user pipe network when all the water is input into the high-pressure maintaining tank 7. The second electromagnetic valve 12 can also be opened, so that when part of the water pressurized by the frequency conversion unit is input into the high-pressure maintaining tank 7, part of the water flows into a user pipe network.
Preferably, the water supply pipe 1 is provided with a first pressure sensor 2. The first pressure sensor 2 is used for detecting the water pressure of the water inlet pipe 1, when the water pressure reaches a minimum limit value, the water consumption peak water volume is insufficient, and the flow stabilizing tank 3 can be subjected to differential compensation through the high-pressure maintaining tank 7 in time.
Preferably, the pressure compensating pipe is provided with a second pressure sensor 6, and the second pressure sensor 6 is positioned at a water inlet of the pressure compensating pipe. The second pressure sensor 6 is used for detecting the outlet pressure of the high-pressure maintaining tank 7, when the pressure is lower than a limit value, the requirement of a user pipe network on water utilization cannot be met, and the high-pressure maintaining tank 7 can be pressurized through the frequency conversion unit in time.
Preferably, the steady flow tank 3 is provided with a vacuum suppressor 4. The vacuum suppressor 4 is used for suppressing the negative pressure generated in the steady flow tank 3 and keeping the municipal water supply pipe network pressure balance.
The working process of the non-negative pressure water supply equipment with the night small flow function of the preferred embodiment is as follows:
municipal incoming water enters the flow stabilizing tank 3 through the incoming water pipe 1 and enters the high-pressure maintaining tank 7 through the water filling pipe until the two tanks are full of water, and the pressure in the high-pressure maintaining tank 7 is equal to the pressure of municipal pipe network water. And opening the fourth electromagnetic valve 14 and the fifth electromagnetic valve 18, wherein other electromagnetic valves are in a closed state, a second butterfly valve of the second frequency converter set is in a closed state, and other butterfly valves are in an open state. Two frequency conversion water pumps 17 are started, the two frequency conversion water pumps 17 are in a series state, the opening degree of the first butterfly valve 15 is adjusted, and different flow rates and pressures of the first water pump unit and the second water pump unit can be achieved. The total pressure is the sum of the pressures of the two variable-frequency water pumps, the specific pressure of each variable-frequency water pump is set according to the high-pressure maintaining tank 7, the pressure is determined by adjusting the frequency of the variable-frequency water pumps, the pressure and the flow of the first water pump unit and the second water pump unit can be adjusted, the pressure and the flow of the three sets of water pump units can also be adjusted simultaneously, and the incoming water is pressurized by the two variable-frequency water pumps 17 connected in series and then is input into the high-pressure maintaining tank 7 through the water inlet pipe. When the water pressure in the high-pressure holding tank 7 rises, the gas in the accumulator 71 is compressed by the water until the pressure in the high-pressure holding tank 7 reaches a set value, and then the fourth solenoid valve 14 and the fifth solenoid valve 18 are closed.
When water needs to be supplied to a user pipe network, the variable frequency water pump 17 of the variable frequency unit is started, all butterfly valves are opened, the second electromagnetic valve 12 and the third electromagnetic valve 13 are opened, and other electromagnetic valves are in a closed state. The two variable frequency water pumps are in a parallel state, incoming water is input into the water supply pipe 11 through the steady flow tank 3 and the variable frequency unit to supply water, pressure is superposed according to the requirement of a user on the basis of municipal water supply pipe network pressure, pressurized water supply is carried out according to the difference and the supplement, and energy is effectively saved.
When the water consumption is high, the water inflow amount is insufficient, when the first pressure sensor 2 detects that the pressure of the water inflow pipe network reaches a limit value, the sixth electromagnetic valve 19 is opened, and the high-pressure maintaining tank 7 performs differential compensation on the flow stabilizing tank 3 after being decompressed by the decompression valve 5.
When the water consumption of the user pipe network at night is obviously reduced, in order to save energy, the variable frequency water pump 17 is closed, the first electromagnetic valve 9 is opened, the compressed air in the energy accumulator 71 expands, and the water is pressed into the water supply pipe 11 for the user pipe network to use at night with small flow.
Along with the continuous increase of the water consumption of the user at night, when the second pressure sensor 6 detects that the pressure of the high-pressure maintaining tank 7 is lower than a set value, the pressure can not meet the water demand of a user pipe network. The following two schemes may be implemented:
scheme 1, close the second butterfly valve of second frequency conversion unit, start two frequency conversion water pumps 17, open fourth solenoid valve 14, fifth solenoid valve 18 and first solenoid valve 9, close second solenoid valve 12 and third solenoid valve 13, the play water of two series connection frequency conversion water pumps gets into high pressure pressurize jar 7 through first check valve 10, fifth solenoid valve 18 this moment, rethread first solenoid valve 9 gets into delivery pipe 11. And when the pressure of the high-pressure maintaining tank 7 reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve 14 and the fifth electromagnetic valve 18 are closed, and water is continuously supplied to the user pipe network 11.
And in the scheme 2, a second butterfly valve of the second frequency conversion unit is closed, two frequency conversion water pumps 17 are started, a fourth electromagnetic valve 14, a fifth electromagnetic valve 18 and a second electromagnetic valve 12 are opened, a first electromagnetic valve 9 and a third electromagnetic valve 13 are closed, water outlet of the two series-connection water pumps is divided into two paths, the first path enters the high-pressure maintaining tank 7 through the first check valve 10 and the fifth electromagnetic valve 18, and the second path directly enters the water supply pipe 11 through the second electromagnetic valve 12. When the pressure of the high-pressure maintaining tank 7 reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve 14, the fifth electromagnetic valve 18 and the second electromagnetic valve 12 are closed, the first electromagnetic valve 9 is opened, and then the water enters the water supply pipe 11 through the first electromagnetic valve 9 to continuously supply water to the user pipe network 11.
The embodiment of the invention also provides a non-negative pressure water supply method with the night small flow function, and the non-negative pressure water supply equipment with the night small flow function is adopted. The water supply method comprises the following steps:
and step 10) starting the variable frequency water pumps 17 of the variable frequency units, connecting the two variable frequency water pumps in a parallel state, inputting the incoming water into a water supply pipe 11 through the steady flow tank 3 and the variable frequency units for water supply, supplying water according to the pressure superposition of the requirement of a user on the basis of the municipal water supply pipe network pressure, and supplying water under pressure according to the principle of how much difference is compensated.
And step 20), when the first pressure sensor 2 detects that the pressure of the incoming water pipe network reaches a limit value, the sixth electromagnetic valve 19 is opened, and the high-pressure maintaining tank 7 performs differential compensation on the flow stabilizing tank 3 after being decompressed by the decompression valve 5.
And step 30) when the water consumption of the night user pipe network is reduced, the variable frequency water pump 17 is closed, the first electromagnetic valve 9 is opened, and the compressed air in the energy storage device 71 expands to press the water into the water supply pipe 11.
And step 40) when the second pressure sensor 6 detects that the pressure of the high-pressure maintaining tank 7 is lower than a set value, starting the variable-frequency water pumps 17, connecting the two variable-frequency water pumps in a serial state, pressurizing the incoming water by the two variable-frequency water pumps 17 in the serial state, inputting the pressurized water into the high-pressure maintaining tank 7, and closing the variable-frequency water pumps until the pressure in the high-pressure maintaining tank 7 reaches the set value.
According to the non-negative-pressure water supply method with the night small-flow function, water is supplied to a user by the flow stabilizing tank and the frequency conversion unit under a normal state, the flow stabilizing tank is subjected to difference compensation through the high-pressure maintaining tank and the pressure compensating pipe when the water consumption is high, water is supplied through the high-pressure maintaining tank when the water consumption is reduced at night, and the frequent starting of the water pump is reduced. When the pressure of the high-pressure maintaining tank is reduced, the frequency conversion water pumps are connected in series from parallel connection by changing the connection mode of the frequency conversion water pumps in the frequency conversion unit, and the frequency conversion water pumps replace booster pumps to pressurize the high-pressure maintaining tank, so that the structure of water supply equipment is simplified, and the cost is effectively reduced.
Preferably, step 40) specifically comprises:
when the second pressure sensor 6 detects that the pressure of the high-pressure maintaining tank 7 is lower than a set value, the second butterfly valve of the second frequency conversion unit is closed, the two frequency conversion water pumps 17 are started, the fourth electromagnetic valve 14, the fifth electromagnetic valve 18 and the first electromagnetic valve 9 are opened, the second electromagnetic valve 12 and the third electromagnetic valve 13 are closed, and at the moment, the effluent of the two series frequency conversion water pumps enters the high-pressure maintaining tank 7 through the first check valve 10 and the fifth electromagnetic valve 18 and then enters the water supply pipe 11 through the first electromagnetic valve 9. And when the pressure of the high-pressure maintaining tank 7 reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve 14 and the fifth electromagnetic valve 18 are closed, and water is supplied to the user pipe network 11 by the high-pressure maintaining tank 7.
Preferably, step 40) specifically comprises:
when the second pressure sensor 6 detects that the pressure of the high-pressure maintaining tank 7 is lower than a set value, a second butterfly valve of the second frequency conversion unit is closed, the two frequency conversion water pumps 17 are started, the fourth electromagnetic valve 14, the fifth electromagnetic valve 18 and the second electromagnetic valve 12 are opened, the first electromagnetic valve 9 and the third electromagnetic valve 13 are closed, the water outlet of the two series-connected water pumps is divided into two paths, the first path enters the high-pressure maintaining tank 7 through the first check valve 10 and the fifth electromagnetic valve 18, and the second path directly enters the water supply pipe 11 through the second electromagnetic valve 12. When the pressure of the high-pressure maintaining tank 7 reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve 14, the fifth electromagnetic valve 18 and the second electromagnetic valve 12 are closed, the first electromagnetic valve 9 is opened, then the water enters the water supply pipe 11 through the first electromagnetic valve 9, and the high-pressure maintaining tank 7 supplies water to the user pipe network 11.
The embodiments of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be regarded as the technical scope of the present invention.
Claims (7)
1. A non-negative pressure water supply device with a night small flow function is characterized by comprising a water inlet pipe (1), a steady flow tank (3), a water pump water inlet header pipe, a frequency conversion unit, a water pump water outlet header pipe and a water supply pipe (11) which are connected in sequence; the high-pressure constant-current energy-saving device is characterized by further comprising a high-pressure maintaining tank (7), wherein an energy accumulator (71) is arranged in the high-pressure maintaining tank (7), and the high-pressure maintaining tank (7) is connected with the constant-current tank (3) through a water filling pipe; a water inlet pipe and a water outlet pipe are connected between the water supply pipe (11) and the high-pressure maintaining tank (7), a first electromagnetic valve (9) is arranged on the water outlet pipe, and a fifth electromagnetic valve (18) and a first check valve (10) are arranged on the water inlet pipe; a pressure compensating pipe is also connected between the high-pressure maintaining tank (7) and the flow stabilizing tank (3), and a pressure reducing valve (5) and a sixth electromagnetic valve (19) are arranged on the pressure compensating pipe;
the frequency conversion unit comprises at least two groups of water pump units, and the water pump units are arranged between a water pump water inlet main pipe and a water pump water outlet main pipe in parallel;
the water pump unit comprises a water pipe, a water inlet of the water pipe is connected with a water inlet main pipe of the water pump, and a water outlet of the water pipe is connected with a water outlet main pipe of the water pump; the water pipe is sequentially provided with a second butterfly valve (20), a variable frequency water pump (17), a second check valve (16) and a first butterfly valve (15), the second butterfly valve (20) is positioned at the water inlet of the water pipe, and the first butterfly valve (15) is positioned at the water outlet of the water pipe;
the frequency conversion unit comprises a first water pump unit, a second water pump unit and a first bypass pipe, a fourth electromagnetic valve (14) is arranged on the first bypass pipe, a water inlet of the first bypass pipe is connected with a water outlet main pipe of the water pump, the joint of the first bypass pipe and the water outlet main pipe of the water pump is positioned between the joint of the first water pump unit and the water outlet main pipe of the water pump and the joint of the second water pump unit and the water outlet main pipe of the water pump, and a water outlet of the first bypass pipe is connected with an inlet of a frequency conversion water pump of the second water pump unit; and a third electromagnetic valve (13) is arranged on the water outlet main pipe of the water pump, and the third electromagnetic valve (13) is positioned between the joint of the first bypass pipe and the water outlet main pipe of the water pump and the joint of the second water pump unit and the water outlet main pipe of the water pump.
2. The non-negative pressure water supply equipment with the night small flow function according to claim 1, wherein the water supply pipe (11) is provided with a second electromagnetic valve (12), and the second electromagnetic valve (12) is positioned between the connection position of the water supply pipe and the water inlet pipe and the connection position of the water supply pipe and the water outlet pipe.
3. The non-negative pressure water supply equipment with night time small flow function according to claim 1, characterized in that the water inlet pipe (1) is provided with a first pressure sensor (2).
4. The non-negative-pressure water supply equipment with the night-time small-flow function according to claim 1, wherein the pressure compensating pipe is provided with a second pressure sensor (6).
5. A non-negative pressure water supply method with a night small flow function is characterized in that the non-negative pressure water supply equipment with the night small flow function of any one of claims 1 to 4 is adopted; the method comprises the following steps:
step 10) starting the variable frequency water pumps (17) of the variable frequency units, connecting the variable frequency water pumps in a parallel state, and inputting incoming water into a water supply pipe (11) through the steady flow tank (3) and the variable frequency units for water supply;
step 20), when the detected pressure of the water inlet pipe reaches a limit value, opening a sixth electromagnetic valve (19), and performing differential compensation on the flow stabilizing tank (3) after the pressure of the high-pressure maintaining tank (7) is reduced by a pressure reducing valve (5);
step 30), when the water consumption of the night user pipe network is reduced, the variable frequency water pump (17) is closed, the first electromagnetic valve (9) is opened, compressed air in the energy storage device (71) expands, and water is pressed into the water supply pipe (11) to supply water;
and step 40) when the pressure of the high-pressure maintaining tank (7) is detected to be lower than a set value, starting the variable-frequency water pumps (17), connecting the variable-frequency water pumps in a serial state, boosting the incoming water through the plurality of variable-frequency water pumps (17) in series, inputting the boosted water into the high-pressure maintaining tank (7), and closing the variable-frequency water pumps until the pressure in the high-pressure maintaining tank (7) reaches the set value.
6. The non-negative pressure water supply method with the night time small flow function according to claim 5, wherein the step 40) specifically comprises:
when a second pressure sensor (6) detects that the pressure of a high-pressure maintaining tank (7) is lower than a set value, a second butterfly valve of a second frequency conversion unit is closed, two frequency conversion water pumps (17) are started, a fourth electromagnetic valve (14), a fifth electromagnetic valve (18) and a first electromagnetic valve (9) are opened, a second electromagnetic valve (12) and a third electromagnetic valve (13) are closed, and the effluent of the two frequency conversion water pumps connected in series enters the high-pressure maintaining tank (7) through a first check valve (10) and the fifth electromagnetic valve (18) and then enters a water supply pipe (11) through the first electromagnetic valve (9); and when the pressure of the high-pressure maintaining tank (7) reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve (14) and the fifth electromagnetic valve (18) are closed, and water is supplied from the high-pressure maintaining tank (7).
7. The non-negative pressure water supply method with the night small flow function according to claim 5, wherein the step 40) specifically comprises:
when a second pressure sensor (6) detects that the pressure of a high-pressure maintaining tank (7) is lower than a set value, a second butterfly valve of a second frequency conversion unit is closed, two frequency conversion water pumps (17) are started, a fourth electromagnetic valve (14), a fifth electromagnetic valve (18) and a second electromagnetic valve (12) are opened, a first electromagnetic valve (9) and a third electromagnetic valve (13) are closed, the water outlet of the two frequency conversion water pumps connected in series is divided into two paths, the first path enters the high-pressure maintaining tank (7) through a first check valve (10) and the fifth electromagnetic valve (18), and the second path directly enters a water supply pipe (11) through the second electromagnetic valve (12); when the pressure of the high-pressure maintaining tank (7) reaches a set value, the two variable-frequency water pumps are closed, the fourth electromagnetic valve (14), the fifth electromagnetic valve (18) and the second electromagnetic valve (12) are closed, the first electromagnetic valve (9) is opened, then the water enters the water supply pipe (11) through the first electromagnetic valve (9), and water is supplied by the high-pressure maintaining tank (7).
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| CN113718891A (en) * | 2021-09-10 | 2021-11-30 | 扬州德道市政设计院有限公司 | Energy-saving municipal water supply pipeline system |
| CN114277892A (en) * | 2022-01-25 | 2022-04-05 | 中韩杜科泵业(湖州)有限公司 | Water supply system with novel intelligent structure |
| CN114809200B (en) * | 2022-06-14 | 2023-01-24 | 南京科技职业学院 | Non-negative pressure water supply equipment and water supply method |
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Effective date of registration: 20220303 Address after: 211500 No. 305 East Road, Liuhe District, Jiangsu, Nanjing Applicant after: LANSHEN GROUP Co.,Ltd. Applicant after: Nanjing bodeli smart water Co., Ltd Address before: No. 305, Xiongzhou East Road, Xiongzhou street, Liuhe District, Nanjing, Jiangsu 210000 Applicant before: Nanjing bodeli smart water Co.,Ltd. |
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