CN205776485U - A kind of heat meter calibration constant pressure water supply system - Google Patents
A kind of heat meter calibration constant pressure water supply system Download PDFInfo
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- CN205776485U CN205776485U CN201620688883.4U CN201620688883U CN205776485U CN 205776485 U CN205776485 U CN 205776485U CN 201620688883 U CN201620688883 U CN 201620688883U CN 205776485 U CN205776485 U CN 205776485U
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Abstract
The utility model discloses a kind of heat meter calibration constant pressure water supply system, including water tank, water pump, host computer, PLC, pressure transducer, vacuum tank, gas-removing filter and calibrating pipeline, host computer is for setting the reference pressure value of constant pressure water supply system, and corresponding signal is transmitted to PLC, pressure transducer is for detecting the observed pressure value of calibrating pipeline and transmitting corresponding signal to PLC, PLC difference based on above-mentioned two force value determines the quantity of the water pump needing startup, and start each water pump successively, thus be prevented effectively from when starting multiple stage water pump simultaneously and the problem that pressure jump is fluctuated occurs, improve pressure transducer and the stability of whole constant pressure water supply system.
Description
Technical field
This utility model relates to heat meter calibration field, particularly to a kind of heat meter calibration constant pressure water supply system.
Background technology
The verification process of calorimeter needs use water system, in order to the verification result making calorimeter is more accurate,
Being accomplished by making the pressure stability of the calibrating pipeline of current process in water system, inventor of the present utility model is in practical operation
Finding, the moment that the multiple stage water pump in water system starts simultaneously is easily caused pressure jump fluctuation, and pressure transducer is straight
It is connected in succession on calibrating pipeline, easily makes the detection signal of pressure transducer be interfered and then to affect constant pressure water supply system normal
Work, and the service life of pressure transducer is also adversely affected.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of heat meter calibration constant pressure water supply system, and it has opens
Generation pressure jump fluctuation it is prevented effectively from, it is not easy to damage the features such as sensor during dynamic multiple stage water pump.
To achieve these goals, this utility model adopts the technical scheme that: a kind of heat meter calibration constant pressure water supply
System, including water tank, water pump, described constant pressure water supply system also include host computer, PLC, pressure transducer, vacuum tank,
Gas-removing filter；
Described water pump is at least two, and each described water pump is set up in parallel, one end of each described water pump and described water tank
Connecting, the other end imports calibrating pipeline；
Described calibrating pipeline is provided with described pressure transducer, is provided with between described calibrating pipeline and described pressure transducer
Buffering bend pipe, the transmission of observed pressure value to described PLC, is passed to described pressure by described pressure transducer along described water pump
It is sequentially provided with described gas-removing filter and described vacuum tank, the end of described calibrating pipeline on the described calibrating pipeline that sensor extends
Connect with described water tank；
Described host computer is for setting the reference pressure value of described constant pressure water supply system, and is transmitted by described reference pressure value
To described PLC；
Described PLC includes PID control unit, and described PID control unit is based on described reference pressure value and described
The difference of observed pressure value determines the quantity starting described water pump；
Described PID control unit controls described water pump and starts by platform, restarts when a upper water pump reaches operating frequency
Next water pump.
Improving as one, described constant pressure water supply system also includes converter, and described PLC passes through described converter
Control the rotating speed of at least one described water pump.
Improving as one, described buffering bend pipe is U-tube, and the two ends of described U-tube connect described pressure sensing respectively
Device and described calibrating pipeline.
Technique effect of the present utility model:
The moment simultaneously started compared to multiple stage water pump in existing constant pressure water supply system is easily caused pressure jump fluctuation
Problem, the heat meter calibration constant pressure water supply system in this utility model, by PLC control water pump by platform start,
Restart next water pump when a upper water pump reaches operating frequency, be not prevented effectively from the appearance of pressure jump fluctuation, thus not
Pressure transducer and whole constant pressure water supply system can be produced harmful effect.
Owing to being provided with buffering bend pipe between calibrating pipeline and pressure transducer in this utility model, avoiding further can
The pressure jump fluctuation that can occur or bigger pressure directly act on sensor, it is ensured that sensor and whole constant pressure water supply system
Service behaviour.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Wherein, 1, water tank, 2, water pump, 3, host computer, 4, PLC, 5, gas-removing filter, 6, vacuum tank, 7, pressure
Sensor, 8, calibrating pipeline, 9, buffering bend pipe, 10, converter, the 21, first water pump, the 22, second water pump, 41, PID controls singly
Unit.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain this
Utility model, and need not be with restriction this utility model.
Fig. 1 shows a kind of heat meter calibration constant pressure water supply system structural representation that this utility model provides, in order to
It is easy to explanation, figure only gives the part relevant to this utility model.
Heat meter calibration constant pressure water supply system, including water tank 1, water pump 2, host computer 3, PLC 4, filtration of cooling down
Device 5, vacuum tank 6, pressure transducer 7.
The quantity of the water pump shown in Fig. 1 is two, is the first water pump 21 and the second water pump 22 respectively, and two water pumps set side by side
Putting, one end of every water pump connects with water tank 1, and the other end imports in calibrating pipeline 8, and certain water pump can be no less than 2
Any amount, this is not limited by this utility model.
Calibrating pipeline 8 is provided with pressure transducer 7, the wherein preferred piezoresistive pressure sensor of pressure transducer 7, the most also
Other kinds of pressure transducer can be selected.Buffering bend pipe 9, pressure sensing it is provided with between calibrating pipeline 8 and pressure transducer 7
Device 7 by the transmission of observed pressure value signal to PLC 4, along water pump 2 on the calibrating pipeline 8 that pressure transducer 7 extends successively
Being provided with gas-removing filter 5 and vacuum tank 6, the end of calibrating pipeline 8 connects with water tank 1, i.e. pumps into inspection from water tank by water pump
Water route behind fixed tube road sequentially passes through for eliminating the gas-removing filter of underwater bubble, vacuum tank and pressure transducer, finally returns
It flow in water tank.
In the present embodiment, buffering bend pipe 9 is U-tube, and the two ends of U-tube connect pressure transducer 7 and calibrating pipeline respectively
8, certainly, buffering bend pipe can also be minor arc type pipe or spiral circle cast pipe, and this utility model is to buffering the shape of bend pipe not
It is defined.
Host computer 3 is for setting the reference pressure value of constant pressure water supply system, and the transmission of normal pressure value signal is controlled to PLC
Device 4 processed；In this utility model, host computer is computer, naturally it is also possible to be other equipment.
Wherein, PLC 4 includes PID control unit 41, PID control unit 41 based on obtain reference pressure value and
The difference of described observed pressure value determines the quantity starting water pump 2, i.e. starts how many water pumps and observed pressure value can be made to reach mark
Quasi-force value.
Concrete, after the quantity having determined the water pump 2 needing startup, PID control unit 4 controls water pump 2 and starts by platform,
As it is shown in figure 1, the i.e. first water pump 21 and the second water pump 22 start the most simultaneously, but the first water pump 21 startup reaches work frequency
Recur during rate the second water pump, i.e. restarts next water pump when a upper water pump reaches operating frequency.
The moment simultaneously started compared to multiple stage water pump in existing constant pressure water supply system is easily caused pressure jump fluctuation
Problem and and then affect normally working of pressure transducer and water system, the heat meter calibration constant voltage in this utility model
Water system, controls water pump by PLC and starts by platform, restart next when a upper water pump reaches operating frequency
Water pump, is prevented effectively from the appearance of pressure jump fluctuation, from without producing pressure transducer and whole constant pressure water supply system not
Good impact, improves the stability of constant pressure water supply system.
Owing to being provided with buffering bend pipe between calibrating pipeline and pressure transducer in this utility model, avoiding further can
The pressure jump fluctuation that can occur or bigger pressure directly act on sensor, it is ensured that sensor and whole constant pressure water supply system
Service behaviour.
Wherein, constant pressure water supply system also includes that converter 10, PLC 4 control the first water pump 21 by converter 10
Rotating speed, certain PLC can be by the rotating speed of the multiple water pump of Frequency Converter Control, and this is not limited by this utility model
System.The setting of converter so that when starting integer platform water pump and can not reach the reference pressure value set, converter can be passed through
The flow velocity of one or more water pump is adjusted, so that water pump produces hydraulic pressure and reaches reference pressure value.In operation cleverer
Live, further enhance stability and the practicality of constant pressure water supply system.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, are all contained in of the present utility model
Within protection domain.
Claims (4)
1. a heat meter calibration constant pressure water supply system, including water tank, water pump, it is characterised in that described constant pressure water supply system
Also include host computer, PLC, pressure transducer, vacuum tank, gas-removing filter；
Described water pump is at least two, and each described water pump is set up in parallel, and one end of each described water pump connects with described water tank,
The other end imports calibrating pipeline；
Described calibrating pipeline is provided with described pressure transducer, is provided with buffering between described calibrating pipeline and described pressure transducer
Bend pipe, described pressure transducer is by observed pressure value transmission extremely described PLC, along described water pump to described pressure transducer
It is sequentially provided with described gas-removing filter and described vacuum tank, the end of described calibrating pipeline and institute on the described calibrating pipeline extended
State water tank to connect；
Described host computer is for setting the reference pressure value of described constant pressure water supply system, and transmits described reference pressure value to institute
State PLC；
Described PLC includes PID control unit, and described PID control unit is based on described reference pressure value and described actual measurement
The difference of force value determines the quantity starting described water pump；
Described PID control unit controls described water pump and starts by platform, restarts next when a upper water pump reaches operating frequency
Platform water pump.
Heat meter calibration constant pressure water supply system the most according to claim 1, it is characterised in that described constant pressure water supply system
Also including converter, described PLC is by the rotating speed of the described water pump of described Frequency Converter Control at least.
Heat meter calibration constant pressure water supply system the most according to claim 1, it is characterised in that described buffering bend pipe is U
Type pipe, the two ends of described U-tube connect described pressure transducer and described calibrating pipeline respectively.
Heat meter calibration constant pressure water supply system the most according to claim 1, it is characterised in that described pressure transducer is
Piezoresistive pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620688883.4U CN205776485U (en) | 2016-07-04 | 2016-07-04 | A kind of heat meter calibration constant pressure water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620688883.4U CN205776485U (en) | 2016-07-04 | 2016-07-04 | A kind of heat meter calibration constant pressure water supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205776485U true CN205776485U (en) | 2016-12-07 |
Family
ID=58126941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620688883.4U Active CN205776485U (en) | 2016-07-04 | 2016-07-04 | A kind of heat meter calibration constant pressure water supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205776485U (en) |
-
2016
- 2016-07-04 CN CN201620688883.4U patent/CN205776485U/en active Active
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