CN112928897A - Frequency converter, water pump and constant-pressure water supply system - Google Patents

Frequency converter, water pump and constant-pressure water supply system Download PDF

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Publication number
CN112928897A
CN112928897A CN201911149920.9A CN201911149920A CN112928897A CN 112928897 A CN112928897 A CN 112928897A CN 201911149920 A CN201911149920 A CN 201911149920A CN 112928897 A CN112928897 A CN 112928897A
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CN
China
Prior art keywords
frequency converter
water
pressure
control
water pump
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
Application number
CN201911149920.9A
Other languages
Chinese (zh)
Inventor
张方阳
吴仁君
刘锦杭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou City Vocational College (huizhou Business And Tourism Advanced Vocational And Technical School)
Original Assignee
Huizhou City Vocational College (huizhou Business And Tourism Advanced Vocational And Technical School)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Huizhou City Vocational College (huizhou Business And Tourism Advanced Vocational And Technical School) filed Critical Huizhou City Vocational College (huizhou Business And Tourism Advanced Vocational And Technical School)
Priority to CN201911149920.9A priority Critical patent/CN112928897A/en
Publication of CN112928897A publication Critical patent/CN112928897A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B1/00—Methods or layout of installations for water supply
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/0017—Casings, cabinets or drawers for electric apparatus with operator interface units
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings
    • H05K5/0234—Feet; Stands; Pedestals, e.g. wheels for moving casing on floor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0247—Electrical details of casings, e.g. terminals, passages for cables or wiring
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/06—Hermetically-sealed casings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/06—Hermetically-sealed casings
    • H05K5/069—Other details of the casing, e.g. wall structure, passage for a connector, a cable, a shaft

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a frequency converter, a water pump and a constant-pressure water supply system. The frequency converter comprises a drive plate, a control plate, an upper shell and a lower shell, wherein the upper shell and the lower shell are hermetically connected to form a shell of the frequency converter, the drive plate and the control plate are arranged in the upper shell, and the frequency converter is provided with a communication port to support networking of a plurality of machines. The invention also discloses a water pump, which comprises a frequency converter and a motor, wherein the frequency converter is directly and fixedly arranged on the outer side of the motor through a bottom plate, and the intelligent control among a plurality of water pumps is realized through the frequency converter on line to form a constant-pressure water supply system.

Description

Frequency converter, water pump and constant-pressure water supply system
Technical Field
The invention relates to the technical field of constant-pressure water supply, in particular to a frequency converter, a water pump and a constant-pressure water supply system.
Background
The constant-pressure water supply frequency converter is a water pump frequency conversion controller specially used for constant-pressure water supply. The constant-pressure water supply frequency converter can enable a water supply system to stably and reliably operate, achieves unattended full-automatic circulating pump reversing and frequency conversion operation in the true sense, ensures the optimal operation efficiency of each water pump and the stable operation starting stability of equipment, eliminates the starting heavy current impact, reduces the average rotating speed of the pump, prolongs the service life of the pump and can eliminate the water hammer effect during starting and stopping.
Disclosure of Invention
The invention provides a frequency converter for constant-pressure water supply, which is directly arranged on a motor, and supports linkage control of at most four motors through communication connecting terminals arranged in the frequency converter, so that the water supply pressure is accurately controlled. In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a frequency converter, includes epitheca, converter subassembly, inferior valve, the bottom plate that stacks gradually the setting, epitheca and inferior valve sealing connection in order to form the casing of frequency converter, inferior valve periphery are equipped with the heat dissipation cavity, and the one side and the detachable connection of bottom plate of epitheca are kept away from to the inferior valve, and the one side that the inferior valve was kept away from to the epitheca is provided with human-computer interaction module, and the converter subassembly sets up in the inside of epitheca. The lower end of the upper shell is provided with a waterproof joint, and an input/output line and a control line of the frequency converter are all connected by the waterproof joint.
Furthermore, the man-machine interaction module comprises a key module and a display module.
Preferably, the heat dissipation cavity is arranged on the lower end face of the lower shell.
As another technical scheme of the invention, the upper shell is provided with a detachable part, and the detachable part of the upper shell is sealed by a waterproof rubber sealing strip.
Further, the converter subassembly includes control panel and drive plate. The drive plate is arranged between the waterproof connector and the control plate.
Furthermore, the drive board is provided with a plurality of connecting terminals, including but not limited to main loop connecting terminal, load connecting terminal and ground terminal, and drive board one end links to each other with the control panel, and the other end links to each other with the converter for receive the signal of control panel and according to the action of signal drive converter.
Further, each connecting terminal is isolated by an insulating baffle.
Furthermore, a sensor connecting port and a communication connecting port are arranged on the control panel
Preferably, the communication connecting terminal is a 485 communication interface.
Furthermore, the control panel is electrically connected with the drive board and the control keys through a signal wire harness and a power wire harness and is used for receiving and processing information input by the sensor and the human-computer interaction module and outputting signals to the drive board to control the working state of the frequency converter.
The water pump controlled by the frequency converter comprises the frequency converter and a motor, wherein the frequency converter is detachably arranged on the outer side of a shell of the motor through a bottom plate, a load connecting terminal of the frequency converter is electrically connected with the motor through an alternating current output reactor, and a main loop connecting terminal is electrically connected with a power supply.
The utility model provides a constant pressure water supply installation, includes 1 ~ 4 the water pump passes through the common pipeline intercommunication, and wherein the sensor connection port of 1 ~ 2 water pumps is connected with water pressure sensor. The frequency converter connected with the water pressure sensor is a master control frequency converter, the master control frequency converter can set water pressure parameters, the pressure sensor collects water pressure data and sends the water pressure data to the control panel of the frequency converter through the sensor connecting port, the frequency converters are connected in an RS485 communication mode, the control panel of the master control frequency converter sends a command to the online frequency converter through the 485 communication interface after analyzing and processing the water pressure data, and the frequency converter executes the command to control the water yield of the water pump so as to keep water supply constant pressure.
Further, the water pressure sensor is a pressure transmitter or a remote pressure gauge.
Further, when the sensor connection port of 2 water pumps is connected with a water pressure sensor, the frequency converter of 2 water pumps can be set with two water pressure parameters for alternate use, and when one of the water pumps is damaged, the other water pump automatically operates to make the system never stop water.
As another technical scheme, the frequency converter provided by the invention provides an RS485 communication interface and supports a Modbus-RTU slave station communication protocol, so that the frequency converter in the constant-pressure water supply device can be controlled in a centralized manner through a computer or a PLC (programmable logic controller), the operation command of the frequency converter is set through the communication protocol, the parameters of the function codes are modified or read, and the working state, the fault information and the like of the frequency converter are read.
The invention has the beneficial effects that: 1. the frequency converter is directly installed on the motor without a control cabinet.
2. The frequency converter supports a plurality of machines to be networked.
3. According to the constant-pressure water supply device based on the frequency converter, the water pumps are connected in an RS485 communication mode, at most 4 water pumps are connected, the frequency converters of the water pumps are connected in an RS485 communication mode, and the communication transmission mode is an asynchronous serial and half-duplex transmission mode.
4. The frequency converter is connected with the pressure sensor, so that the real-time pressure of the constant-pressure water supply device can be checked and shared.
Drawings
The figures further illustrate the invention, but the examples in the figures do not constitute any limitation of the invention.
Fig. 1 is a structural sectional view of a frequency converter according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of connection between a frequency converter and a motor according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the operation of the double water pump.
Fig. 4 is a schematic diagram of the operation of four water pumps.
Wherein: 1, controlling a key; 2, mounting a shell; 3, a lower shell; 4, a bottom plate; 5, controlling the board; 6 driving the board; 7, a waterproof joint; 8, connecting a screw; 9, a pressure tank; 10 MP series servo motors; 11, remotely transmitting a pressure gauge; 12 a pressure transmitter; 13 a non-return valve.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the frequency converter provided by the invention comprises a control key 1, an upper shell 2, a lower shell 3 and a bottom plate 4 which are sequentially stacked, wherein the upper shell 2 and the lower shell 3 are hermetically connected to form a shell of the frequency converter, a waterproof joint 7 is arranged at the lower end of the upper shell 2, the waterproof joint 7 is used for realizing the electrical connection between the frequency converter and an external electrical appliance, and meanwhile, the waterproof joint 7 has good sealing performance, so that the electrical connection can be ensured to be lifted, water and dust are prevented from permeating into the frequency converter, and the protection grade of the frequency converter is ensured. Be equipped with drive plate 6 and control panel 5 in the converter, wherein drive plate 6 and control panel 5 all set up inside epitheca 2, are provided with R, S, T main loop connecting terminal on the drive plate 6, U, V, W load connecting terminal and ground terminal 7 connecting terminals altogether, and keep apart with insulating baffle between every connecting terminal. The lower terminal surface of the lower shell 3 of the frequency converter is provided with heat dissipation holes for heat dissipation of the frequency converter, so that damage to the frequency converter caused by overhigh temperature inside the frequency converter 1 is prevented.
As shown in FIG. 2, the lower casing 3 of the frequency converter provided by the invention is connected and fixed on the outer side of the casing of the vertical motor through the bottom plate 4 to form a water pump, and is connected and fixed by the connecting screw 8.
As shown in fig. 3, the water pump a and the water pump b are communicated through a common pipeline to form a constant pressure water supply device, and a water outlet port of the pipeline is provided with a pressure tank 9. Control panels 5 of frequency converters on the two water pumps are provided with 485 communication connection ports of S +, S-and GND and sensor connection ports of V1, 10V and GND. Sensor connection ports of the water pump a and the water pump b are connected with a remote transmission pressure gauge 11. And the frequency converters of the water pump a and the water pump b are connected in an RS485 communication mode. R, S, T main loop connecting terminals of the driving plates 6 of the frequency converters of the water pumps a and b are connected with a power supply, U, V, W load connecting terminals are connected with the MP series servo motor 10, and a grounding terminal is grounded. The MP series servomotor 10 is connected to the common pipe through a non-return valve 13. The remote transmission pressure gauge 11 sends the collected water pressure data to the control panel 5 of the frequency converter through the sensor connecting port, and the frequency converter is connected in an RS485 communication mode, so that the water pump a and the water pump b can share the water pressure data, and the frequency converter controls the water yield of the water pump according to the water pressure data to enable the water supply to keep constant pressure. Because the sensor connection ports of the water pump a and the water pump b are both connected with the remote transmission pressure gauge 11, the frequency converters of the 2 water pumps can be set with two water pressure parameters for alternative use.
As shown in fig. 4, the water pump c, the water pump d, the water pump e and the water pump f are communicated through a common pipe to constitute a constant pressure water supply device. The water outlet of the pipeline is provided with a pressure tank 9. Control panels 5 of frequency converters on the two water pumps are provided with 485 communication connection ports of S +, S-and GND, and sensor connection ports of CI and 24V. Sensor connection ports of the water pump c and the water pump d are both connected with a pressure transmitter 12, so that frequency converters of the water pump c and the water pump d are master control frequency converters. The frequency converters of the 4 water pumps are connected in an RS485 communication mode. R, S, T main loop connecting terminals of a driving plate 6 of the frequency converters of the 4 water pumps are connected with a power supply, U, V, W load connecting terminals are connected with the MP series servo motor 10, and a grounding terminal is grounded. The MP series servomotor 10 is connected to the common pipe through a non-return valve 13. The pressure transmitter 12 sends the collected water pressure data to the control panel 5 of the main control frequency converter through the sensor connecting port, the frequency converters are connected in an RS485 communication mode, so that 4 water pumps can share the water pressure data, the main control frequency converter analyzes and processes the water pressure data, and sends a command to other connected frequency converters through a 485 communication interface, and the frequency converter executes the command to control the water yield of the water pumps to keep the water supply constant. Because the sensor connection ports of the water pump c and the water pump d are both connected with the pressure transmitter 12, the frequency converters of the 2 water pumps can be set with two water pressure parameters for alternate use.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. The utility model provides a frequency converter, includes epitheca (1), converter subassembly, inferior valve (3), bottom plate (4) that stack gradually the setting, its characterized in that: the upper shell (2) and the lower shell (3) are connected in a sealing mode to form a shell, a heat dissipation cavity is arranged on the periphery of the lower shell (3), one surface, far away from the upper shell (2), of the lower shell (3) is detachably connected with the bottom plate (4), a man-machine interaction module (1) is arranged on one surface, far away from the lower shell (3), of the upper shell (2), the frequency converter assembly is arranged in the cavity of the upper shell (2), and the frequency converter assembly comprises a control panel (5) and a drive panel (6);
the lower end of the upper shell (2) is provided with a waterproof connector (7), and an input/output line and a control line are all connected by the waterproof connector (7);
the driving board (6) is provided with a plurality of connecting terminals, including a main loop connecting terminal, a load connecting terminal and a grounding terminal, one end of the driving board (6) is connected with the control board (5), and the other end of the driving board is connected with the frequency converter and used for receiving signals of the control board (5) and driving the frequency converter to act according to the signals;
the control panel (5) is provided with a sensor connecting port and a communication connecting port;
the control board (5) is electrically connected with the drive board (6) and the human-computer interaction module (1) through a signal wire harness and a power wire harness, and is used for receiving and processing information input by the sensor and the human-computer interaction module (1) and outputting a signal to the drive board (6) to control the working state of the frequency converter.
2. A frequency converter according to claim 1, characterized in that: the communication connection port is a 485 communication interface.
3. A frequency converter according to claim 1, characterized in that: the drive plate (6) is arranged between the waterproof connector (7) and the control plate (5).
4. A frequency converter according to claim 3, characterized in that: each connecting terminal is isolated by an insulating baffle.
5. A water pump, characterized by: comprising the inverter according to any one of claims 1 to 4 and a motor, said inverter being detachably mounted on the outside of a casing of said motor through said bottom plate (4), said load connection terminals being electrically connected to said motor through an AC output reactor, said main circuit connection terminals being electrically connected to a power source.
6. A constant pressure water supply system composed of the water pump according to claim 5, characterized in that: the water pumps are communicated through a common pipeline, and the sensor connecting port of at least 1 water pump is connected with a water pressure sensor;
the frequency converter connected with the water pressure sensor is a master frequency converter;
the pressure sensor collects water pressure data and sends the water pressure data to the frequency converter through the sensor connecting port, the frequency converter is connected in an RS485 communication mode, the control panel (5) of the main control frequency converter analyzes and processes the water pressure data and sends a command to the online frequency converter through the 485 communication interface, and the frequency converter executes the water yield of the command control water pump to keep constant water supply pressure.
7. The constant pressure water supply system according to claim 6, wherein: the water pressure sensor is a pressure transmitter or a remote pressure gauge.
8. The constant pressure water supply system according to claim 6, wherein: the number of the water pumps is 1-4, wherein the number of the water pumps connected with the water pressure sensors is 1-2.
CN201911149920.9A 2019-11-21 2019-11-21 Frequency converter, water pump and constant-pressure water supply system Pending CN112928897A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911149920.9A CN112928897A (en) 2019-11-21 2019-11-21 Frequency converter, water pump and constant-pressure water supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911149920.9A CN112928897A (en) 2019-11-21 2019-11-21 Frequency converter, water pump and constant-pressure water supply system

Publications (1)

Publication Number Publication Date
CN112928897A true CN112928897A (en) 2021-06-08

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CN201911149920.9A Pending CN112928897A (en) 2019-11-21 2019-11-21 Frequency converter, water pump and constant-pressure water supply system

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203770108U (en) * 2013-12-31 2014-08-13 上海众辰电子科技有限公司 Water pump control device for constant pressure water supply
CN204941881U (en) * 2015-08-07 2016-01-06 南京贝德环保设备制造有限公司 A kind of constant pressure water supply automatical control system
CN205039685U (en) * 2015-10-14 2016-02-17 孚瑞肯电气(深圳)有限公司 Frequency converter
CN206402117U (en) * 2016-12-19 2017-08-11 孚瑞肯电气(深圳)有限公司 A kind of frequency converter and composition motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203770108U (en) * 2013-12-31 2014-08-13 上海众辰电子科技有限公司 Water pump control device for constant pressure water supply
CN204941881U (en) * 2015-08-07 2016-01-06 南京贝德环保设备制造有限公司 A kind of constant pressure water supply automatical control system
CN205039685U (en) * 2015-10-14 2016-02-17 孚瑞肯电气(深圳)有限公司 Frequency converter
CN206402117U (en) * 2016-12-19 2017-08-11 孚瑞肯电气(深圳)有限公司 A kind of frequency converter and composition motor

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