CN109018752B - A kind of gas shield device of serials control - Google Patents
A kind of gas shield device of serials control Download PDFInfo
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- CN109018752B CN109018752B CN201810731448.9A CN201810731448A CN109018752B CN 109018752 B CN109018752 B CN 109018752B CN 201810731448 A CN201810731448 A CN 201810731448A CN 109018752 B CN109018752 B CN 109018752B
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- pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The present invention discloses a kind of gas shield device of serials control; including inflation circuit, exhausting loop and control loop; high pressure gas cylinder is connected to inflation circuit and exhausting loop respectively by a triple valve, and the other end of inflation circuit and exhausting loop is separately connected the air inlet and exhaust outlet of container；Control loop includes the variable frequency pump being arranged on exhausting loop.The present invention is supplemented when container internal pressure is too low using a large amount of high-pressure inert gas pre-installed in high-voltage energy storage tank using tandem bonus point process control system, and when container internal pressure is excessively high, extra inert gas is pumped into spare in high pressure energy storage canister.The fluctuation that can lead to pressure in equipment to avoid the lag controlled due to pressure by serials control, can control equipment inner inflatable and exhaust using Staged cotrol.
Description
Technical field
The present invention relates to the gas shield technical field of device, the gas shield more particularly to a kind of serials control is filled
It sets.
Background technique
In recent years, with the continuous progress of technology, the equipment for designing production is more and more exquisiter, corresponding storage, maintenance
And the requirement of transport etc. also correspondinglys increase.Certain equipment, such as generating equipment (nuclear power, thermoelectricity, wind-powered electricity generation and hydroelectric facility),
Petrochemical equipment and some electronic equipments etc., during long-distance transport and storage, in order to prevent due to contact inside equipment
Oxygen and vapor and occur to aoxidize or corrode, typically will be inside equipment and space outside is from so using sealing element
The inert gases such as nitrogen of internal filling certain pressure are protected afterwards, since internal pressure is greater than external environment atmospheric pressure at this time
Power can effectively prevent the entrance of outside air and vapor, prevents to corrode and aoxidize, in particular by ship transportation timeliness
Fruit is more readily apparent.
Existing gas-filled protective method is the inert gas that certain pressure is filled inside the equipment being sealed, then directly
Connect storage or transport.Due to considering economic cost, before equipment is not installed, generally first wife is not used to seal at sealing joint
Pad, or due to certain adapter tubes it is subsequent by connecting pipe thus be fitted without the construction of sealing ring, these nozzles all use interim close
Seal structure, two kinds of sealing means cannot all bear higher internal pressure.On the other hand, it if keeping lower internal pressure, cannot protect
It demonstrate,proves and is in isolation with external inside equipment.
Since equipment is not stored in warm library, or transport road is farther out, causes temperature difference obvious across latitude is larger,
And the temperature difference at daytime and night is very big, according to gas balance equations, the inert gas pressure inside container has very big fluctuation,
Often have generation the case where beyond the internal pressure range allowed；Existing technical method is equipped with a certain amount of bailout bottle, when
When container internal pressure is too low, it is supplemented with inert gas in bottle, and when causing internal pressure excessively high since temperature raises
It can not handle, it is most likely that revealed at nozzle.The limitation of the method is very big, is supplemented after container internal pressure is too low
Gas is adjusted to specified value, needs period regular hour, and in this time cycle, nonprotected state is in inside container；And
After temperature raising causes internal pressure excessively high, internal pressure may cause seal failure.In addition, art methods can not solve daytime and
The night temperature difference changes the problem of leading to internal pressure circular wave repeatedly.
Summary of the invention
The purpose of the invention is to overcome the deficiencies of the prior art and provide a kind of holding internal pressure it is stable, in real time adjust, gram
Temperature influence, the gas shield device that can quickly overcome temperature to influence internal pressure are taken, and is one and is swift in response, overcomes lag
Cascade control system gas shield device.
To achieve the above object, the present invention provides following schemes: the present invention provides a kind of gas shield of serials control
Device, including inflation circuit, exhausting loop and control loop, high pressure gas cylinder by a triple valve respectively with the inflation circuit and
The other end of exhausting loop connection, the inflation circuit and exhausting loop is separately connected the air inlet and exhaust outlet of container；It is described
Control loop includes the variable frequency pump being arranged on the exhausting loop.
Preferably, electric control valve is provided on the inflation circuit.
Preferably, the control loop includes inner looping, and the inner looping is using in container described in temperature sensor measurement
Measuring signal is simultaneously passed to temperature transmitter by wall temperature, and temperature signal is converted to temperature controller by the temperature transmitter can
The standard signal of identification；The temperature controller is electrically connected with the electric control valve and variable frequency pump respectively.
Preferably, the control loop further includes external loop, and the external loop measures the container using pressure sensor
Measuring signal is simultaneously passed to pressure transmitter by internal pressure, and pressure signal is converted to pressure controller by the pressure oscillation device
Identifiable standard signal；The pressure controller is electrically connected with the electric control valve and variable frequency pump respectively.
Preferably, by the measuring signal of temperature and pressure respectively with it is respective in the temperature controller and pressure controller
Setting value compares, and input value of the gained difference as each controller, then output valve is calculated according to input value in each controller；
Input value of the output valve and measured temperature of the pressure controller collectively as the temperature controller, the temperature control
The final output value that device is calculated is for controlling the electric control valve and frequency conversion pump operation.
The present invention achieves following technical effect compared with the existing technology:
The present invention uses tandem bonus point process control system, when container internal pressure is too low, using pre- in high-voltage energy storage tank
A large amount of high-pressure inert gas of dress are supplemented, and when container internal pressure is excessively high, extra inert gas is pumped into high pressure
It is spare in energy storage canister.It can lead to the fluctuation of pressure in equipment to avoid the lag controlled due to pressure by serials control, use
Staged cotrol can control equipment inner inflatable and exhaust.In addition, controller is using the proportional integration (PI) in PID control rule
Method can not only eliminate remaining difference, but also can guarantee the fast and stable rebalancing of controlled parameter, thus may be implemented to equipment inside
Pressure it is real-time, accurately control, overcome the influence of temperature change, guarantee the stabilization of container internal pressure, realize whole sealing,
Therefore there is very big promotion prospect and social demand.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the gas shield device of serials control.
Fig. 2 is a kind of control block of the gas shield device of serials control；
Wherein, 1 high pressure gas cylinder；2 triple valves；3 electric control valves；4 pressure controllers；5 pressure transmitters；6 pressure sensings
Device；7 temperature sensors；8 temperature transmitters；9 temperature controllers；10 variable frequency pumps；11 containers.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The purpose of the invention is to overcome the deficiencies of the prior art and provide a kind of holding internal pressure it is stable, in real time adjust, gram
Temperature influence, the gas shield device that can quickly overcome temperature to influence internal pressure are taken, and is one and is swift in response, overcomes lag
Cascade control system gas shield device.
The gas shield device of serials control provided by the invention, including inflation circuit, exhausting loop and control loop are high
Air bottle is connected to inflation circuit and exhausting loop respectively by a triple valve, inflates the other end difference of circuit and exhausting loop
Connect the air inlet and exhaust outlet of container；Control loop includes the variable frequency pump being arranged on exhausting loop.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Please refer to Fig. 1-2, wherein Fig. 1 is a kind of structural schematic diagram of the gas shield device of serials control.
Fig. 2 is a kind of control block of the gas shield device of serials control.
As shown in Figure 1, the present invention provides a kind of gas shield device of serials control, including high pressure gas cylinder 1, triple valve 2,
Electric control valve 3, pressure controller 4, pressure transmitter 5, pressure sensor 6, temperature sensor 7, temperature transmitter 8, temperature
Controller 9 and variable frequency pump 10 with direction arrow are pipeline in figure, and bold portion is actual gas pipeline, and dotted portion is
Control loop.
Gas pipeline is broadly divided into equipment inflation circuit and exhausting loop two, and its circulating direction is fixed, wherein being vented
In circuit then inert gas is driven into high pressure gas cylinder 1 by being extracted out inside equipment by variable frequency pump 10 after triple valve 2；It fills
In feed channel circuit, due to the effect of pressure difference, inert gas after triple valve 2, passes through electric control valve 3 by high pressure gas cylinder 1
It is squeezed into inside equipment after control flow.
Control loop part, whole system use tandem bonus point process control system, and inner looping is that the temperature of coarse adjustment controls, outside
Circuit is that the pressure of fine tuning controls, and controller determines the work of electric control valve and variable frequency pump according to the measuring signal inside equipment
Make state and operation power, realizes the pressurising or decompression inside container 11.It is measured at 11 inner wall of container using temperature sensor 7
Temperature, then measuring signal is passed to the standard signal for being converted to 4-20mA after temperature transmitter 8, can be controlled by temperature
Device 9 is identified；Pressure sensor 6 measures 11 internal pressure of container, and measuring signal is then passed to pressure transmitter 5, pressure
Pressure signal is converted to the standard signal of 4-20mA by transmitter 5, can be identified by pressure controller 4；By temperature and pressure
Measuring signal respectively compared with respective setting value, input value of the difference as respective controller, then temperature controller 9 and pressure
Force controller 4 calculates output valve according to given control law, and wherein the output of pressure controller 4 and measured temperature are total
With the input value as temperature controller 9, the output valve that final temperature controller 9 is calculated is to control electric control valve 3
With variable frequency pump 10, it can be realized which circuit in exhausting loop and inflation circuit is run, and operation power is much, realizes container
Accurate, real-time pressure or decompression inside 11 guarantee the stabilization of inert gas pressure inside equipment, realize whole sealing.
That is the control program of system are as follows:
In order to solve the no problem that pressure control lags behind internal pressure variation, holding equipment internal pressure is stablized, can be according to container
The variation of environment temperature at 11 inner walls first adjusts the increment of inert gas, coarse adjustment is realized rapidly, then further according in equipment
Pressure and given value between deviation, further adjust inert gas increment, realize fine tuning, to ensure the stabilization of internal pressure, this
Just constitute the cascade control system that temperature and pressure is together in series.
According to hardware condition, instrument control can be upgraded into computer and directly control DDC system, is i.e. above system is used tricks
Calculation machine controls, and can replace the list-directed PID approach of instrument using advanced algorithms such as fuzzy control, neuron controls.
Embodiment 1
Whole system is connected as shown in Figure 1, under original state, the inert gas of filling authorized pressure value inside equipment,
It is much higher than the high-pressure inert gas of equipment internal pressure in high pressure gas cylinder 1 full of pressure, when initial, pressure value inside equipment is accurate etc.
In specified value, all in closed state, i.e. the aperture of electric control valve 3 and variable frequency pump 10 is transported for exhausting loop and inflation circuit at this time
Row power is all zero.Pressure sensor 6 and temperature sensor 7 distinguish real-time monitoring, the variation of 11 internal pressure of real-time delivery container
Change with inner wall temperature, when ambient temperature reduces, according to gas balance equations, equipment internal pressure will be reduced, this
When, when temperature has just reduced and internal pressure does not fluctuate, the temperature signal measured is passed to temperature transmitter 8 by temperature sensor 7,
The temperature signal that temperature transmitter 8 passes over upstream is changed into the 4-20mA standard telecommunications that temperature controller 9 can identify
Number, then measured value is compared by system with setting value, its difference is known as deviation, as the input of temperature controller 9, by
It is reduced in temperature, measured value is less than setting value, and temperature controller 9 adjusts electric control valve 3 according to proportional plus integral control method
Aperture, the inert gas in high pressure gas cylinder 1 is squeezed into equipment, realizes and the coarse adjustment of pressure is controlled；Then, pressure controller
4 according to the pressure value measured in resulting equipment, and internally pressure is accurately controlled, and the output of pressure controller 4 is as temperature control
The input of device 9 processed adjusts the aperture of electric control valve 3, realizes fine tuning, is constituted a complete band tandem closed-loop control system with this
System.In this regulating cycle, the operation power of variable frequency pump 10 is zero under normal circumstances, i.e., in the completely closed state, only when
When occurring overshoot in control process, system just can temporarily start variable frequency pump 10, i.e. inflation is excessive, and equipment internal pressure is higher than setting value
When, the system conditions of embodiment 2 can be jumped to, until balancing again.
Embodiment 2
When ambient temperature increases, the temperature first at the equipment inner wall that measures of temperature sensor 7 is greater than given value,
Temperature controller 9 starts variable frequency pump 10 according to deviation and the extra inert gas in equipment is discharged into high pressure gas cylinder 1 at this time, real
Existing coarse adjustment, the equipment internal pressure that then pressure sensor 6 measures, pressure controller 4 are used according to the output valve that deviation obtains
In the input of temperature controller 9, the operation power of variable frequency pump 10 is controlled further according to the output of temperature controller 9, realizes fine tuning,
Until pressure divergence is zero, i.e., pressure is stable within the scope of specified value again, and a regulating cycle terminates.If there is overshoot,
I.e. exhaust is excessive, when equipment internal pressure is lower than setting value, can jump to the system conditions of embodiment 1, until balancing again.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (2)
1. a kind of gas shield device of serials control, it is characterised in that: including inflating circuit, exhausting loop and control loop,
High pressure gas cylinder is connected to respectively by a triple valve with the inflation circuit and exhausting loop, circuit and the exhausting loop inflated
The other end is separately connected the air inlet and exhaust outlet of container；The control loop includes the frequency conversion being arranged on the exhausting loop
It pumps, is provided with electric control valve on the inflation circuit；
The control loop includes inner looping, and the inner looping is using container inner wall temperature described in temperature sensor measurement and will survey
Amount signal passes to temperature transmitter, and temperature signal is converted to the identifiable standard of temperature controller by the temperature transmitter to be believed
Number；The temperature controller is electrically connected with the electric control valve and variable frequency pump respectively；
The control loop further includes external loop, and the external loop measures the container internal pressure using pressure sensor and will
Measuring signal passes to pressure transmitter, and pressure signal is converted to the identifiable mark of pressure controller by the pressure transmitter
Calibration signal；The pressure controller is electrically connected with the electric control valve and variable frequency pump respectively.
2. the gas shield device of serials control according to claim 1, it is characterised in that: by the measurement of temperature and pressure
Signal is respectively compared with setting value respective in the temperature controller and pressure controller, and gained difference is as each controller
Input value, then output valve is calculated according to input value in each controller；The output valve and temperature of the pressure controller measure
It is worth the input value collectively as the temperature controller, the final output value that the temperature controller is calculated is for controlling institute
State electric control valve and frequency conversion pump operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810731448.9A CN109018752B (en) | 2018-07-05 | 2018-07-05 | A kind of gas shield device of serials control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810731448.9A CN109018752B (en) | 2018-07-05 | 2018-07-05 | A kind of gas shield device of serials control |
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| CN109018752A CN109018752A (en) | 2018-12-18 |
| CN109018752B true CN109018752B (en) | 2019-09-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110077746B (en) * | 2019-04-29 | 2020-10-16 | 中国长城葡萄酒有限公司 | Liquid storage tank pressure maintaining device and method |
| CN110764407B (en) * | 2019-11-26 | 2022-12-23 | 苏州新仪科学仪器有限公司 | Pressure control method and system of solid phase extraction column and electronic equipment |
| CN111086784B (en) * | 2019-12-18 | 2022-04-08 | 浙江信汇新材料股份有限公司 | Automatic pressure supplementing and relieving process system for low-pressure tank of normal-pressure tank |
| CN111846675A (en) * | 2020-08-12 | 2020-10-30 | 眉山麦克在线设备股份有限公司 | Oil gas volatilization inhibition system and method with inert gas protection function |
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| CH100334A (en) * | 1922-06-29 | 1923-07-16 | Sekinger Otto | Storage container for storing explosive substances of all kinds. |
| CN201053911Y (en) * | 2007-04-24 | 2008-04-30 | 胜利油田胜利工程设计咨询有限责任公司 | Contaminated water tank closed air supplying pressure-regulating metering device |
| CN102221111A (en) * | 2011-03-28 | 2011-10-19 | 南京梅山冶金发展有限公司 | Temperature control pressure valve and temperature control pressure valve for coke oven |
| CN103970159B (en) * | 2014-05-15 | 2016-06-01 | 华中科技大学 | A kind of fast Puffer-type pressure-fired securing system |
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