CN215367519U - Double-tank negative-pressure-free water supply equipment - Google Patents
Double-tank negative-pressure-free water supply equipment Download PDFInfo
- Publication number
- CN215367519U CN215367519U CN202121240784.7U CN202121240784U CN215367519U CN 215367519 U CN215367519 U CN 215367519U CN 202121240784 U CN202121240784 U CN 202121240784U CN 215367519 U CN215367519 U CN 215367519U
- Authority
- CN
- China
- Prior art keywords
- water
- pipe
- water pump
- pressure
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses double-tank negative-pressure-free water supply equipment 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, a water supply pipe and a high-pressure maintaining tank, wherein the high-pressure maintaining tank is connected with the flow stabilizing 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; the frequency conversion unit comprises a first water pump unit, a second water pump unit and a bypass pipe, a water inlet of the bypass pipe is connected with the water pump water outlet main pipe, the joint of the bypass pipe and the water pump water outlet main pipe is located between the joint of the first water pump unit and the joint of the second water pump unit and the joint of the water pump water outlet main pipe, and a water outlet of the bypass pipe is connected with an inlet of a frequency conversion water pump of the second water pump unit. The utility model has no negative pressure water supply equipment, and when the water consumption at night is reduced, the water is supplied through the high-pressure maintaining tank, so that the frequent starting of the pump is reduced. When the pressure of the high-pressure maintaining tank is insufficient, the two variable-frequency water pumps are connected in series instead of being connected in parallel, so that the high-pressure maintaining tank is pressurized, and the structure of the water supply equipment is simplified.
Description
Technical Field
The utility model belongs to the technical field of municipal water supply, and particularly relates to double-tank non-negative-pressure water supply equipment.
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 utility model provides the double-tank non-negative-pressure water supply equipment, which realizes the small-flow high-pressure maintaining at night, effectively increases the compensation amount and reduces the frequent starting of the water pump.
In order to solve the technical problem, the embodiment of the utility model adopts the following technical scheme: the double-tank non-negative pressure 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 connected in sequence; 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; the frequency conversion unit comprises a first water pump unit with a second butterfly valve and a frequency conversion water pump, a second water pump unit with a second butterfly valve and a frequency conversion water pump and a bypass pipe, and the first water pump unit and the second water pump unit are arranged between a water pump water inlet main pipe and a water pump water outlet main pipe in parallel; a fourth electromagnetic valve is arranged on the bypass pipe, a water inlet of the bypass pipe is connected with the water pump water outlet main pipe, a joint of the bypass pipe and the water pump water outlet main pipe is positioned between a joint of the first water pump unit and the water pump water outlet main pipe and a joint of the second water pump unit and the water pump water outlet main pipe, and a water outlet of the bypass pipe is connected with an inlet of a variable frequency water pump of the second water pump unit; and a third electromagnetic valve is arranged on the water pump water outlet main pipe and is positioned between the joint of the bypass 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.
As a further improvement of the embodiment of the utility model, the first 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 second butterfly valve and the variable frequency water pump are arranged on the water pipe, the second check valve and the first butterfly valve are sequentially arranged on the water pipe, 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 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 disposed on the water filling pipe.
As a further improvement of the embodiment of the utility model, a vacuum suppressor is arranged on the steady flow tank.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects: according to the double-tank non-negative-pressure water supply equipment, water is supplied to a user by the flow stabilizing tank and the frequency conversion unit under a normal state, and water is supplied by the high-pressure maintaining tank when the water consumption is reduced at night, so that the frequent starting of the water pump is reduced. When high-pressure pressurize jar pressure is not enough, through the connected mode who changes frequency conversion water pump in the frequency conversion unit, two frequency conversion water pumps become the series connection by parallelly connecting, replace the booster pump to pressurize for high-pressure pressurize jar, have simplified water supply equipment's structure, effective reduce cost.
Drawings
Fig. 1 is a schematic structural view of a double-tank non-negative pressure water supply apparatus according to an embodiment of the present invention.
The figure shows that: the variable-frequency water supply device comprises a water inlet pipe 1, a first pressure sensor 2, a steady flow tank 3, a vacuum suppressor 4, a second pressure sensor 6, a high-pressure maintaining tank 7, an energy accumulator 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 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 utility model provides double-tank pressure-stabilizing compensation non-negative-pressure water supply equipment, which comprises a water inlet pipe 1, a flow stabilizing 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 flow stabilizing tank 3, the water outlet of the flow stabilizing 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. The frequency conversion unit comprises a first water pump unit, a second water pump unit and a bypass pipe, and the first water pump unit and the second water pump unit are arranged between the water pump water inlet main pipe and the water pump water outlet main pipe in parallel. The first water pump unit and the second water pump unit are both provided with a second butterfly valve 20 and a variable frequency water pump 17. The bypass pipe is provided with a fourth electromagnetic valve 14. The water inlet of the bypass is connected with the water outlet main pipe of the water pump, the joint of the bypass 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 bypass 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 bypass 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 double-tank negative-pressure-free water supply equipment of the embodiment supplies water for users by the steady flow tank 3 and the frequency conversion unit in a normal state, and the embodiment is provided with the high-pressure maintaining tank 7, 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 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. The high pressure pressurize jar pressure is not enough, when needing to input high pressure water for 7 pressure boost of high pressure pressurize jar in 7 to high pressure pressurize jar, through opening fourth solenoid valve 14, close second butterfly valve 20 and the third solenoid valve 13 on the water pump water outlet header pipe of second water pump set, establish ties through the frequency conversion water pump of bypass pipe with the frequency conversion water pump of first water pump set and second water pump set, the frequency conversion water pump of two series connections can replace the booster pump, water supply equipment's structure has been simplified, effective reduce cost.
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.
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 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 water filling pipe is provided with a second pressure sensor 6, and the second pressure sensor 6 is positioned at the water outlet of the water filling pipe. The second pressure sensor 6 is used for monitoring the pressure of the high-pressure maintaining tank 7, and when the pressure cannot meet the water demand of a user pipe network, the high-pressure maintaining tank 7 is pressurized 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 double-tank non-negative-pressure water supply equipment of the 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 20 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 or the second water pump unit can be adjusted, the pressure and the flow of the two 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 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 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 (6)
1. A double-tank non-negative pressure water supply device 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; the frequency conversion unit comprises a first water pump unit with a second butterfly valve (20) and a frequency conversion water pump (17), a second water pump unit with a second butterfly valve (20) and a frequency conversion water pump (17) and a bypass pipe, and the first water pump unit and the second water pump unit are arranged between a water pump water inlet main pipe and a water pump water outlet main pipe in parallel; a fourth electromagnetic valve (14) is arranged on the bypass pipe, a water inlet of the bypass pipe is connected with the water pump water outlet main pipe, the joint of the bypass pipe and the water pump water outlet main pipe is positioned 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 a water outlet of the bypass pipe is connected with an inlet of a variable frequency water pump of the second water pump unit; and a third electromagnetic valve (13) is arranged on the water pump water outlet main pipe, and the third electromagnetic valve (13) is positioned between the joint of the bypass 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.
2. The double-tank non-negative-pressure water supply equipment as claimed in claim 1, wherein the first 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; second butterfly valve (20) and frequency conversion water pump (17) set up on the water pipe, still have set gradually second check valve (16) and first butterfly valve (15) on the water pipe, second butterfly valve (20) are located the water inlet department of water pipe, first butterfly valve (15) are located the water outlet department of water pipe.
3. The double-tank non-negative pressure water supply equipment 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 joint of the water supply pipe and the water inlet pipe and the joint of the water supply pipe and the water outlet pipe.
4. The double-tank non-negative-pressure water supply equipment according to claim 1, wherein the water inlet pipe (1) is provided with a first pressure sensor (2).
5. The double-tank non-negative-pressure water supply equipment according to claim 1, wherein the water filling pipe is provided with a second pressure sensor (6).
6. The double-tank non-negative-pressure water supply equipment according to claim 1, wherein a vacuum suppressor (4) is arranged on the steady flow tank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121240784.7U CN215367519U (en) | 2021-06-03 | 2021-06-03 | Double-tank negative-pressure-free water supply equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121240784.7U CN215367519U (en) | 2021-06-03 | 2021-06-03 | Double-tank negative-pressure-free water supply equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215367519U true CN215367519U (en) | 2021-12-31 |
Family
ID=79633194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121240784.7U Active CN215367519U (en) | 2021-06-03 | 2021-06-03 | Double-tank negative-pressure-free water supply equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215367519U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114809200A (en) * | 2022-06-14 | 2022-07-29 | 南京科技职业学院 | Non-negative pressure water supply equipment and water supply method |
-
2021
- 2021-06-03 CN CN202121240784.7U patent/CN215367519U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114809200A (en) * | 2022-06-14 | 2022-07-29 | 南京科技职业学院 | Non-negative pressure water supply equipment and water supply method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113216326B (en) | Non-negative pressure water supply equipment with night small-flow function and water supply method | |
| CN215367519U (en) | Double-tank negative-pressure-free water supply equipment | |
| CN100365216C (en) | Secondary pressing pump station water supply system | |
| CN215211264U (en) | Non-negative pressure water supply equipment with water hammer protection function | |
| CN114541522A (en) | Non-negative pressure water supply device capable of intelligently adjusting high, medium and low peak water supply flow | |
| CN208088425U (en) | A kind of three pot type non-negative pressure water service systems of automatic voltage regulation compensation | |
| CN201567620U (en) | Pipe network add-pressure water supply equipment with regulating tank and compensatory auxiliary pump | |
| CN206928365U (en) | A kind of high-efficiency feedwater equipment | |
| CN113375047B (en) | Hydrogen station with double compression systems operating and operation method thereof | |
| CN114809200B (en) | Non-negative pressure water supply equipment and water supply method | |
| CN210459396U (en) | Improved numerical control three-tank stacked non-negative pressure water supply equipment | |
| CN210395524U (en) | Pressure-stabilizing water supply device | |
| CN210238630U (en) | Pressure-superposed dual water supply equipment | |
| CN210975962U (en) | Three-tank pressure-stabilizing compensation non-negative-pressure water supply equipment | |
| CN216041457U (en) | Three-tank type non-negative pressure water supply equipment | |
| CN201354868Y (en) | Combined type air supply and vent valve | |
| CN214994254U (en) | Non-negative pressure water supply equipment with cleaning function | |
| CN214329103U (en) | Non-negative pressure water supply equipment with emergency function | |
| CN216304794U (en) | Non-negative pressure water supply equipment | |
| CN213143219U (en) | Double-water-source step-by-step pressure-superposed water supply equipment | |
| CN220269138U (en) | Nitrogen system for chemical industry | |
| CN208777371U (en) | Variable frequency non-negative pressure water | |
| CN215562955U (en) | Numerical control pressure-superposed compensation type integrated non-negative pressure water supply equipment | |
| CN201193343Y (en) | Non-negative-pressure water supply equipment in set | |
| CN109138043A (en) | A kind of high-efficiency feedwater equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |