CN112227466A - Public well water supply control system of life and water source heat pump set - Google Patents
Public well water supply control system of life and water source heat pump set Download PDFInfo
- Publication number
- CN112227466A CN112227466A CN202011236501.1A CN202011236501A CN112227466A CN 112227466 A CN112227466 A CN 112227466A CN 202011236501 A CN202011236501 A CN 202011236501A CN 112227466 A CN112227466 A CN 112227466A
- Authority
- CN
- China
- Prior art keywords
- water
- stop valve
- proportional control
- heat pump
- source heat
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 235000020681 well water Nutrition 0.000 title claims abstract description 23
- 239000002349 well water Substances 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- 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
- 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
-
- 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
-
- 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
- E03B7/077—Arrangement of backflow preventing devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Structural Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a public well water supply control system of a life and water source heat pump unit, which comprises: the water supply subsystem, the frequency conversion control subsystem and the proportional control valve control subsystem; the water supply subsystem includes: the device comprises a submersible pump, a first stop valve, a constant pressure tank, a pressure transmitter, a second stop valve, a third stop valve and an electric proportional control valve; the submersible pump is sequentially connected with a first stop valve and a water inlet of a constant pressure tank, a first water outlet and a second water outlet are respectively arranged at the top and the bottom of the constant pressure tank, the first water outlet is connected with a second stop valve, a pressure transmitter is arranged on a pipeline between the first water outlet and the second stop valve, and the second stop valve is connected with a domestic water pipe; the second water outlet is sequentially connected with a third stop valve and an electric proportional control valve through pipelines, and the electric proportional control valve is connected with a well water pipe of the water source heat pump unit through a pipeline; the variable frequency control subsystem is respectively connected with the force transducer and a motor of the submersible pump; the proportional control valve control subsystem is connected with the electric proportional control valve.
Description
Technical Field
The invention belongs to the technical field of water supply control, and relates to a well water supply control system for a domestic and water source heat pump unit.
Background
At present, a plurality of underground water type water source heat pump units are widely applied, but users need to separately drill a well to provide a source water side water source for the units, if domestic water is needed, another well needs to be drilled, and a constant-pressure water supply device needs to be arranged respectively, so that the resources cannot be shared, and the equipment investment is large.
Disclosure of Invention
In order to solve the technical problems, the invention provides a well water supply control system for public use of a domestic and water source heat pump unit, a submersible pump is controlled by constant-pressure frequency conversion to supply water to a constant-pressure tank at constant pressure, and the constant-pressure tank simultaneously supplies underground water to domestic water and a source water side of a water source heat pump
The invention discloses a public well water supply control system of a life and water source heat pump unit, which is characterized by comprising the following components: the water supply subsystem, the frequency conversion control subsystem and the proportional control valve control subsystem;
the water supply subsystem includes: the device comprises a submersible pump, a first stop valve, a constant pressure tank, a pressure transmitter, a second stop valve, a third stop valve and an electric proportional control valve; the submersible pump is sequentially connected with a first stop valve and a water inlet of a constant pressure tank through a pipeline, a first water outlet and a second water outlet are respectively arranged at the top and the bottom of the constant pressure tank, the first water outlet is connected with a second stop valve through a pipeline, a pressure transmitter is arranged on the pipeline between the first water outlet and the second stop valve, and the second stop valve is connected with a domestic water pipe through a pipeline; the second water outlet is sequentially connected with a third stop valve and an electric proportional control valve through pipelines, and the electric proportional control valve is connected with a well water pipe of the water source heat pump unit through a pipeline; the variable frequency control subsystem is respectively connected with the force transducer and a motor of the submersible pump; and the proportional control subsystem is connected with the electric proportional control valve.
In the well water supply control system for the living and water source heat pump units, the frequency conversion control subsystem comprises: the circuit breaker, the frequency converter and the frequency converter control loop, wherein the frequency converter is respectively connected with the circuit breaker, the pressure transmitter and the motor of the submersible pump, and the current is transmitted to the motor of the submersible pump after passing through the circuit breaker and the frequency converter;
the frequency converter control loop comprises: the frequency converter starting indicating lamp, the frequency converter stopping indicating lamp, the starting lamp button, the stopping lamp button and the first miniature relay; the starting lamp button, the stopping lamp button and the first miniature relay coil are connected in series to form a first branch circuit; an auxiliary normally open contact of the first miniature relay is connected with a starting lamp button in parallel, and a frequency converter starting indicator lamp is connected with a first miniature relay coil in parallel; an auxiliary normally closed contact of the first miniature relay is connected with a stop indicator lamp of the frequency converter in series to form a second branch circuit, and the first branch circuit and the second branch circuit are connected in parallel and then are connected with a power supply source through a fuse; the normally open contact of the first miniature relay is connected between the digital input terminal of the frequency converter and the digital input common terminal.
In the public well water supply control system of the life and water source heat pump unit, the control subsystem of the proportional control valve comprises: the water source heat pump unit control box, the backwater temperature sensor, the second miniature relay, the control transformer and the proportional control valve starting switch; the water source heat pump unit control box is connected with the return water temperature sensor and is connected with the electric proportional control valve through a normally open contact of a second miniature relay; the electric proportional control valve is connected with the secondary side of the control transformer, and a coil of the second miniature relay is connected with the proportional control valve starting switch in series and then connected with the primary side of the control transformer in parallel between power supplies.
In the well water supply control system for the living and water source heat pump units, the bottom of the constant pressure tank is also provided with a water outlet, and the water outlet is connected with a fourth stop valve through a pipeline.
The invention discloses a public well water supply control system of a life and water source heat pump unit, which comprises a water supply subsystem, a variable frequency control subsystem and a proportional control valve control subsystem, wherein the water supply subsystem can realize multiple purposes of one well, the variable frequency control subsystem collects the water pressure of a constant pressure tank through a pressure transmitter, controls a submersible pump to supply water for the constant pressure tank at constant pressure through constant voltage variable frequency, simultaneously provides underground water for life water and the source water side of the water source heat pump, and simultaneously adjusts the opening angle of an electric proportional control valve according to the well water return water temperature detected by a return water temperature sensor by arranging the proportional control valve control subsystem.
Drawings
FIG. 1 is a schematic view of a well water supply control system for a domestic and water source heat pump unit according to the present invention;
FIG. 2 is a frequency converter control loop circuit diagram of the variable frequency control subsystem;
FIG. 3 is a circuit diagram of a variable frequency control for the submersible pump;
FIG. 4 is a schematic diagram of a proportional regulating valve control subsystem.
Detailed Description
As shown in figure 1, the invention relates to a well water supply control system for a domestic and water source heat pump unit, which comprises: a water supply subsystem, a variable frequency control subsystem 11 and a proportional control valve control subsystem 12.
The water supply subsystem includes: the device comprises a submersible pump 1, a first stop valve 2, a constant pressure tank 3, a pressure transmitter 4, a second stop valve 5, a third stop valve 7, a fourth stop valve 10 and an electric proportional control valve 8. Immersible pump 1 connects gradually the water inlet of first stop valve 2 and level pressure jar 3 through the pipeline, the top and the bottom of level pressure jar 3 are equipped with first delivery port and second delivery port respectively, and first delivery port passes through pipe connection second stop valve 5, is equipped with pressure transmitter 4 on the pipeline between first delivery port and second stop valve 5, and second stop valve 5 passes through pipe connection domestic water pipe 6. The second water outlet is sequentially connected with a third stop valve 7 and an electric proportional control valve 8 through pipelines, and the electric proportional control valve 8 is connected with a well water pipe 9 of the water source heat pump unit through a pipeline. The bottom of the constant pressure tank 3 is also provided with a water outlet, and the water outlet is connected with a fourth stop valve 10 through a pipeline and used for regularly draining and cleaning the constant pressure tank 3. The variable frequency control subsystem 11 is respectively connected with the force transducer 4 and a motor 13 of the submersible pump, and the proportional control valve control subsystem 12 is connected with the electric proportional control valve 8.
As shown in fig. 2 and 3, the variable frequency control subsystem 11 includes: the device comprises a circuit breaker QF1, a frequency converter BPQ and a frequency converter control loop, wherein the frequency converter BPQ is respectively connected with the circuit breaker QF1, the pressure transmitter 4 and a motor 13 of the submersible pump, and current is conveyed to the motor 13 of the submersible pump after passing through the circuit breaker QF1 and the frequency converter BPQ.
As shown in fig. 3, the frequency converter control loop includes: the inverter starting indicator lamp SB1, the inverter stopping indicator lamp SB2, the starting lamp button SB11, the stopping lamp button SB22 and the first miniature relay KA 1. The start lamp button SB11, stop lamp button SB22 and the first miniature relay coil are connected in series to form a first branch. An auxiliary normally open contact of the first miniature relay KA1 is connected in parallel with the starting lamp button SB11, and the inverter starting indicator lamp SB1 is connected in parallel with the first miniature relay coil. The auxiliary normally closed contact of the first miniature relay is connected with the frequency converter stop indicator lamp SB2 in series to form a second branch circuit, and the first branch circuit and the second branch circuit are connected in parallel and then are connected with a power supply through a fuse FU 1. The normally open contact of the first relay is connected between the digital input terminal X1 of the inverter and the digital input common terminal COM. And setting internal parameters of the frequency converter, and setting the function of the digital quantity input terminal X1 to be normal rotation operation.
As shown in fig. 4, the proportional control valve control subsystem 12 includes: the system comprises a water source heat pump unit control box 14, a backwater temperature sensor 15, a second small relay KA2, a control transformer TR and a proportional control valve starting switch K1. The water source heat pump unit control box 14 is connected with the return water temperature sensor 15, and the water source heat pump unit control box 14 is connected with the electric proportional control valve 8 through a normally open contact of a second miniature relay KA 2; the electric proportional control valve 8 is connected with the secondary side of the control transformer TR, and the coil of the second miniature relay is connected with the proportional control valve starting switch K1 in series and then connected with the primary side of the control transformer TR in parallel between power supplies.
Water supplement and constant pressure water supply modes of the constant pressure tank: when the starting lamp button SB11 is pressed, the coil of the first miniature relay KA1 is electrified, the normally open contact of the first miniature relay KA1 is closed, the X1 terminal and the COM terminal of the frequency converter BPQ are conducted, and the frequency converter BPQ starts to rotate forwards. The pressure transmitter 4 collects the pipeline pressure and sends the pipeline pressure to the frequency converter BPQ, the current passes through the breaker QF and the frequency converter BPQ, the frequency of the current is changed by the frequency converter BPQ and then the current is transmitted to the submersible pump 1, and the motor 13 of the submersible pump operates for constant-pressure water supplement. Immersible pump 1 draws well water from the well, through first stop valve 2, supply to constant pressure jar 4, and constant pressure jar 4 pressure is invariable to guarantee that the rivers flow into domestic water pipe 6 through second stop valve 5, provide the invariable domestic water of pressure.
Water supply mode of water source heat pump unit: after the unit is opened, the water source heat pump unit control box 14 controls a voltage signal for the electric proportional control valve 8 according to the return water temperature detected by the return water temperature sensor 15, the water source heat pump unit control box 14 controls the proportional control valve starting switch K1 to be closed, the coil of the second miniature relay KA2 is electrified, the normally open contact of the second miniature relay KA2 is electrified, the analog quantity signal input end of the electric proportional control valve 8 is communicated with the analog quantity signal output end of the water source heat pump unit control box 14, and the opening angle is adjusted according to the control voltage signal of the water source heat pump unit control box 14, so that the quantity of water flowing to the water source heat pump unit well water pipe 9 is adjusted to the third stop valve 7, and the function of providing an automatic variable-flow source water side water source for.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined by the appended claims.
Claims (4)
1. The utility model provides a public well water supply control system of life and water source heat pump set which characterized in that includes: the water supply subsystem, the frequency conversion control subsystem and the proportional control valve control subsystem;
the water supply subsystem includes: the device comprises a submersible pump, a first stop valve, a constant pressure tank, a pressure transmitter, a second stop valve, a third stop valve and an electric proportional control valve; the submersible pump is sequentially connected with a first stop valve and a water inlet of a constant pressure tank through a pipeline, a first water outlet and a second water outlet are respectively arranged at the top and the bottom of the constant pressure tank, the first water outlet is connected with a second stop valve through a pipeline, a pressure transmitter is arranged on the pipeline between the first water outlet and the second stop valve, and the second stop valve is connected with a domestic water pipe through a pipeline; the second water outlet is sequentially connected with a third stop valve and an electric proportional control valve through pipelines, and the electric proportional control valve is connected with a well water pipe of the water source heat pump unit through a pipeline; the variable frequency control subsystem is respectively connected with the force transducer and a motor of the submersible pump; and the proportional control subsystem is connected with the electric proportional control valve.
2. The well water supply control system for a domestic and water source heat pump unit as claimed in claim 1, wherein said variable frequency control subsystem comprises: the circuit breaker, the frequency converter and the frequency converter control loop, wherein the frequency converter is respectively connected with the circuit breaker, the pressure transmitter and the motor of the submersible pump, and the current is transmitted to the motor of the submersible pump after passing through the circuit breaker and the frequency converter;
the frequency converter control loop comprises: the frequency converter starting indicating lamp, the frequency converter stopping indicating lamp, the starting lamp button, the stopping lamp button and the first miniature relay; the starting lamp button, the stopping lamp button and the first miniature relay coil are connected in series to form a first branch circuit; an auxiliary normally open contact of the first miniature relay is connected with a starting lamp button in parallel, and a frequency converter starting indicator lamp is connected with a first miniature relay coil in parallel; an auxiliary normally closed contact of the first miniature relay is connected with a stop indicator lamp of the frequency converter in series to form a second branch circuit, and the first branch circuit and the second branch circuit are connected in parallel and then are connected with a power supply source through a fuse; the normally open contact of the first miniature relay is connected between the digital input terminal of the frequency converter and the digital input common terminal.
3. The well water supply control system for a domestic and water source heat pump unit as claimed in claim 1, wherein the proportional control valve control subsystem comprises: the water source heat pump unit control box, the backwater temperature sensor, the second miniature relay, the control transformer and the proportional control valve starting switch; the water source heat pump unit control box is connected with the return water temperature sensor and is connected with the electric proportional control valve through a normally open contact of a second miniature relay; the electric proportional control valve is connected with the secondary side of the control transformer, and a coil of the second miniature relay is connected with the proportional control valve starting switch in series and then connected with the primary side of the control transformer in parallel between power supplies.
4. The well water supply control system for the domestic and water source heat pump units as claimed in claim 1, wherein the bottom of the constant pressure tank is further provided with a drain opening, and the drain opening is connected with the fourth stop valve through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236501.1A CN112227466A (en) | 2020-11-09 | 2020-11-09 | Public well water supply control system of life and water source heat pump set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236501.1A CN112227466A (en) | 2020-11-09 | 2020-11-09 | Public well water supply control system of life and water source heat pump set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112227466A true CN112227466A (en) | 2021-01-15 |
Family
ID=74122381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011236501.1A Pending CN112227466A (en) | 2020-11-09 | 2020-11-09 | Public well water supply control system of life and water source heat pump set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112227466A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204151853U (en) * | 2014-07-17 | 2015-02-11 | 谢炳林 | Water supply installation |
| CN104846958A (en) * | 2014-10-30 | 2015-08-19 | 青岛万力科技有限公司 | Non-negative-pressure pressure-superposed constant pressure water supplementing device for heat exchanger unit |
| CN104976839A (en) * | 2015-06-26 | 2015-10-14 | 西安建筑科技大学 | Ground water source heat pump system and method with energy-saving operation mode of water source side switchable |
| CN207121958U (en) * | 2017-09-05 | 2018-03-20 | 钱义 | A kind of fully-automatic household fed water purification device |
| CN213572164U (en) * | 2020-11-09 | 2021-06-29 | 辽宁申和新能源科技有限公司 | Public well water supply control system of life and water source heat pump set |
-
2020
- 2020-11-09 CN CN202011236501.1A patent/CN112227466A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204151853U (en) * | 2014-07-17 | 2015-02-11 | 谢炳林 | Water supply installation |
| CN104846958A (en) * | 2014-10-30 | 2015-08-19 | 青岛万力科技有限公司 | Non-negative-pressure pressure-superposed constant pressure water supplementing device for heat exchanger unit |
| CN104976839A (en) * | 2015-06-26 | 2015-10-14 | 西安建筑科技大学 | Ground water source heat pump system and method with energy-saving operation mode of water source side switchable |
| CN207121958U (en) * | 2017-09-05 | 2018-03-20 | 钱义 | A kind of fully-automatic household fed water purification device |
| CN213572164U (en) * | 2020-11-09 | 2021-06-29 | 辽宁申和新能源科技有限公司 | Public well water supply control system of life and water source heat pump set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206457875U (en) | A kind of intelligent water supply and share system based on PLC | |
| CN201502074U (en) | Digital pipe network laminated water supply equipment | |
| CN213572164U (en) | Public well water supply control system of life and water source heat pump set | |
| CN202595816U (en) | Intelligent negative-pressure-free frequency conversion constant-voltage water supply system | |
| CN203741938U (en) | Pipe network pressurizing energy-saving water supply device | |
| CN208309701U (en) | A kind of Intelligent pipe net laminating water supply equipment with water tank | |
| CN207331813U (en) | Small flow differential pressure Water supply device | |
| CN206873538U (en) | A kind of chamber type intelligent bimodulus supply equipment | |
| CN203741939U (en) | Intelligent box type negative-pressure-free water supply device | |
| CN112227466A (en) | Public well water supply control system of life and water source heat pump set | |
| CN205242517U (en) | A intelligent time control transition system for water supply equipment | |
| CN104746584A (en) | Intelligent box type non-negative pressure water supply device | |
| CN204676632U (en) | A kind of remote monitoring type stabilizing compensation non-negative pressure method of water supply device | |
| CN204326159U (en) | A kind of for providing the energy-saving water supply system of stationary flow and pressure | |
| CN203741929U (en) | Water supply pressure equalizing device of residential building | |
| CN213477028U (en) | Water supply equipment with emergent frequency conversion water supply function | |
| CN208309683U (en) | A kind of box integrated pump station of included pipeline enclosure | |
| CN210459396U (en) | Improved numerical control three-tank stacked non-negative pressure water supply equipment | |
| CN209493995U (en) | A kind of no negative pressure pipe network pressurizing current stabilization water work | |
| CN107604974A (en) | A kind of non-negative pressure frequency-changing water supply device | |
| CN202850126U (en) | Water level control system | |
| CN208830459U (en) | New and effective sewage pump machine system equipment | |
| CN113463723A (en) | Tower-free constant-pressure water supply electrical control system installation and adjustment practical training device | |
| CN206346269U (en) | Secondary water-supply equipment | |
| CN212742729U (en) | Water supply equipment with balanced operating duration function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |