CN203080594U - Water supply system for flow device - Google Patents
Water supply system for flow device Download PDFInfo
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- CN203080594U CN203080594U CN 201320059771 CN201320059771U CN203080594U CN 203080594 U CN203080594 U CN 203080594U CN 201320059771 CN201320059771 CN 201320059771 CN 201320059771 U CN201320059771 U CN 201320059771U CN 203080594 U CN203080594 U CN 203080594U
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- water
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- pump
- water pump
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Abstract
The utility model belongs to the field of flow detection, and relates to a water supply system for a flow device. The water supply system comprises a water pump set, a water-pump rotating-speed measuring device, a pressure transmitter, a standard flowmeter, a regulating valve, a by-pass valve, soft starters, a frequency converter and a controller, wherein detection signals of the water-pump rotating-speed measuring device, the pressure transmitter and the standard flowmeter are sent to the controller; the water pump set comprises at least two water pumps, one water pump is controlled by the controller through the frequency converter, and other water pumps are controlled by the controller through the soft starters, all the water pumps are connected in parallel, the by-pass valve is installed on a by-pass pipeline, the by-pass pipeline is connected with the water pumps in parallel, and water supplied through the water pumps and the by-pass valve flows into a calibration pipeline; and the pressure transmitter, the regulating valve and the standard flowmeter are installed on the calibration pipeline. The water supply system has the advantages of being low in cost, small in occupied space, and capable of meeting accuracy requirements of flow standard devices.
Description
Technical field
The utility model relates to field of flow detection, specially refers to a kind of water system of flow apparatus.
Background technology
Flow measurement requires to have high accuracy, high efficiency etc. as the important component part of national economy.The flow standard device as the flux unit value unified with the standard of transmitting, guarantee that the value of China each department and all departments is unified on the standard, for business accounting or arbitration work provide foundation.Therefore the discharge stability that improves the flow standard device is significant.
High-order water tower is the comparatively desirable water source of flow standard device, and it provides the current of pressure stability, and the discharge stability in the calibrating pipeline can reach and be better than 0.06% level.But water tower construction cost height, it is bigger to take up room, and pressure head is limited.At present, flow apparatus often adopts the water system of Frequency Converter Control water pump in conjunction with pressurizing vessel.This water system is practical more economically than water tower, and can pass through Frequency Converter Control pump rotary speed saves energy.At present, this water system generally only can reach 0.2% discharge stability level, compares with water tower and still has gap.And along with calibrating pipeline bore and flow increase, needed pressurizing vessel volume also increases, the construction cost and the increase thereupon that takes up room.
The utility model content
The purpose of this utility model is the above-mentioned deficiency that overcomes prior art, provides a kind of with low cost, and it is little to take up room, and can meet the water system of the required precision of flow standard device.The technical solution of the utility model is as follows:
A kind of flow apparatus water system comprises water pump group, pump rotary speed measurement mechanism, pressure transmitter, proving flowmeter, control valve, bypass valve, soft initiator, frequency converter and controller, wherein,
The detection signal of pump rotary speed measurement mechanism, pressure transmitter, proving flowmeter is admitted to controller;
Described water pump group comprises at least two water pumps, wherein one is by the water pump of controller by Frequency Converter Control, other water pump is controlled by soft initiator by controller, each water pump parallel connection, bypass valve is arranged on the bypass line in parallel with each water pump, water via water pump and bypass valve supply flows into the calibrating pipeline;
Described pressure transmitter, control valve and proving flowmeter are arranged on the calibrating pipeline, and the force value that controller detects according to pressure transmitter is regulated pump rotary speed by frequency converter, make line pressure be stabilized in the force value that calibrating needs; According to the flow value of proving flowmeter, regulate the aperture of calibrating pipeline adjusted valve; By regulating the aperture of bypass valve, the flow of control bypass line.
As preferred implementation, described water system also comprises the strainer of cooling down that is arranged on the calibrating pipeline; Described water system also comprises and is arranged on that calibrating is gone up and by the pipeline sluice valve of controller control; Described pump rotary speed measurement mechanism is a photoelectric encoder.
Advantage of the present utility model is:
1, do not having water tower, do not having under the situation of pressurizing vessel, changing real-Time Compensation, flow apparatus is being had be better than 0.1% discharge stability based on the control of pump rotary speed closed loop feedback, power frequency operation pump rotary speed.
2, the calibrating flow process of water system and flow apparatus control computer transmits information by communication, and it can independently be realized opening, stopping of self and move control, have higher independence.
3, both can the dependable flow meter during calibrating, device has and is better than 0.1% discharge stability, in the time of can realizing meter proof again, between the different flow point automatically, quick switching.
4, both can the dependable flow meter during calibrating, device has and is better than 0.1% discharge stability, and when again can assurance device carrying out the calibrating of different flow point, water flow pressure is basic identical.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model.
Accompanying drawing 2 is the structural representation of an embodiment of the utility model.
Description of drawings: drawing among the figure has two kinds of dotted lines clearly, identifies two class circuits respectively.
The specific embodiment
Referring to Fig. 1, the utility model comprises water pump group, frequency converter, soft initiator, speed probe, pressure transmitter, proving flowmeter, pipeline sluice valve, control valve, bypass valve, controller, display, the strainer of cooling down.
Operating principle of the present utility model is as described below: the calibrating flow process control computer of controller and device carries out communication, receives the information that calibrating flow process control computer is sent, as parameters such as calibrating pipeline numbering, detective tube linear pressure, calibrating flow points; Controller is opened the pipeline sluice valve automatically, selects the water pump in the water pump group automatically, and controls its start-up course, according to the force value of calibrating pipeline upward pressure transmitter, regulates pump rotary speed by frequency converter, makes line pressure be stabilized in the force value that calibrating needs; Controller is regulated the aperture of calibrating pipeline adjusted valve according to the flow value of detective tube line standard flow meter, thereby reaches the flow value that the calibrating pipeline needs; Controller keeps constant according to the fluctuation situation of pump rotary speed by the operating frequency control of pump rotating speed of regulating frequency converter, thus the discharge stability of control verification pipeline; Many water pump parallel connections, the water pump that a Frequency Converter Control is only arranged, other is during for the power frequency operation water pump of soft initiator control, controller is according to the rotation speed change situation of power frequency operation water pump, regulate the water pump of Frequency Converter Control, its rotating speed is changed, thereby compensation power frequency operation pump rotary speed change the flowed fluctuation that produces, the discharge stability of assurance device; Display shows the operation conditions of water system in real time, as water pump start and stop state, rotating speed, frequency converter operating frequency, soft initiator state, the setting value of line pressure, flow, currency, pipeline control valve opening etc.; Controller is by regulating the aperture of bypass valve, and the flow of control bypass line guarantees the steady switching of many water pumps, guarantees that water pump is in best operating point; Impurity in the strainer filtered water stream of cooling down is eliminated the bubble in the current, improves the clean level of current, makes mobile more steady.
If an embodiment of the present utility model is shown in Figure 2, the ultrasonic flow rate among Fig. 2 is counted tested flow meter:
1, water pump group is according to the range of flow 130m of flow apparatus
3/ h ~ 1800m
3/ h designs 3 90kW water pumps.
2,1 90kW frequency converter, 2 90kW soft initiators are controlled 3 water pump operations.3 photoelectric encoders detect the rotating speed of every water pump respectively.1 pressure transmitter is used for detecting the pressure of pipeline current.Select 0.2 grade of Electromagnetic Flow to count proving flowmeter.Control valve and bypass valve are selected electric butterfly valve for use, and the pipeline sluice valve is selected pneumatic ball valve for use.Select for use PLC as controller, liquid crystal touch screen is as display.The calibrating flow process control computer of PLC and flow apparatus transmits information by 485 communications.
3, a cartridge type photoelectric encoder is installed on the extension shaft of pump motor axle, in order to detect tach signal.The axle of extension shaft and pump motor is fixing by welding.
4, the photoelectric encoder output pulse signal passes to PLC with rotary speed information.PLC according to the currency of pump rotary speed and setting value by suitable control scheme, calculating frequency converter corresponding work frequency values.PLC is by 485 communication setting frequency converter frequency values.Can improve the speed stability of water pump by suitable control scheme, and then improve the discharge stability of device.
Claims (4)
1. a flow apparatus water system comprises that water pump group, pump rotary speed measurement mechanism, pressure transmitter, proving flowmeter, control valve is characterized in that, also comprises bypass valve, soft initiator, frequency converter and controller, wherein,
The detection signal of pump rotary speed measurement mechanism, pressure transmitter, proving flowmeter is admitted to controller;
Described water pump group comprises at least two water pumps, wherein one is by the water pump of controller by Frequency Converter Control, other water pump is controlled by soft initiator by controller, each water pump parallel connection, bypass valve is arranged on the bypass line in parallel with each water pump, water via water pump and bypass valve supply flows into the calibrating pipeline;
Described pressure transmitter, control valve and proving flowmeter are arranged on the calibrating pipeline, and the force value that controller detects according to pressure transmitter is regulated pump rotary speed by frequency converter, make line pressure be stabilized in the force value that calibrating needs; According to the flow value of proving flowmeter, regulate the aperture of calibrating pipeline adjusted valve; By regulating the aperture of bypass valve, the flow of control bypass line.
2. flow apparatus water system according to claim 1 is characterized in that, described water system also comprises the strainer of cooling down that is arranged on the calibrating pipeline.
3. flow apparatus water system according to claim 1 is characterized in that, described water system also comprises and is arranged on that calibrating is gone up and by the pipeline sluice valve of controller control.
4. flow apparatus water system according to claim 1 is characterized in that, described pump rotary speed measurement mechanism is a photoelectric encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320059771 CN203080594U (en) | 2013-02-01 | 2013-02-01 | Water supply system for flow device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320059771 CN203080594U (en) | 2013-02-01 | 2013-02-01 | Water supply system for flow device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203080594U true CN203080594U (en) | 2013-07-24 |
Family
ID=48826449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320059771 Expired - Fee Related CN203080594U (en) | 2013-02-01 | 2013-02-01 | Water supply system for flow device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203080594U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103088872A (en) * | 2013-02-01 | 2013-05-08 | 天津大学 | Water supplying system for flow device |
| CN103603409A (en) * | 2013-12-03 | 2014-02-26 | 中国农业大学 | Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve |
| CN108709613A (en) * | 2018-08-28 | 2018-10-26 | 苏州市格致科教仪器设备制造有限公司 | A kind of system and method that achievable multithread gauge is calibrated simultaneously |
-
2013
- 2013-02-01 CN CN 201320059771 patent/CN203080594U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103088872A (en) * | 2013-02-01 | 2013-05-08 | 天津大学 | Water supplying system for flow device |
| CN103603409A (en) * | 2013-12-03 | 2014-02-26 | 中国农业大学 | Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve |
| CN108709613A (en) * | 2018-08-28 | 2018-10-26 | 苏州市格致科教仪器设备制造有限公司 | A kind of system and method that achievable multithread gauge is calibrated simultaneously |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20200201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |