CN207541486U - Dry vacuum mechanical pump electric control gear - Google Patents
Dry vacuum mechanical pump electric control gear Download PDFInfo
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- CN207541486U CN207541486U CN201721817615.9U CN201721817615U CN207541486U CN 207541486 U CN207541486 U CN 207541486U CN 201721817615 U CN201721817615 U CN 201721817615U CN 207541486 U CN207541486 U CN 207541486U
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Abstract
The utility model discloses a kind of dry vacuum mechanical pump electric control gear, which can control multi-stage vacuum pump group, including：Pressure sensing cell before the consistent pump group of multiple pump group quantity contained by with the multi-stage vacuum pump group, pressure sensing cell is connected respectively with vacuum pump group pipelines at different levels before each pump group；The Analog input mModule of one or more PLC is connected respectively with pressure sensing cell before each pump group and electronic control unit；Electronic control unit；Multi-level networks communication module；And multiple AC converters being connected respectively with vacuum pump groups at different levels.The utility model realized on the basis of hardware input is not increased by the pressure detecting to pump group leading portions at different levels and synchronous adjustment, and General Promotion automatic control is horizontal, shortens the manually-operated time, hence it is evident that improve production efficiency.
Description
Technical field
The utility model is related to a kind of dry vacuum mechanical pumps that kiln is smelted in industry, particularly relate to a kind of dry
Formula vacuum mechanical pump electric control gear.
Background technology
Molten steel vacuum circulation degassing system process (RH techniques) is a kind of important molten steel furnace external refining method, is had de-
The functions such as gas, decarburization, temperature-compensating, uniform liquid steel temperature and ingredient, removal steel inclusion.Due to molten steel vacuum circulation degassing
The vacuum degree of system process requirement is high, exhausted air quantity is big, thus using after multistage series connection of pumps again with dry type screw rod series connection of pumps, composition
Vacuum pump group；Vacuum cavity generally only according to instruction is extracted into the vacuum degree of setting, does not accomplish have by traditional dry vacuum pump
The purpose for being monitored and controlling to vacuum degree or even adjust of effect.Therefore need design one kind can be in real time to dry vacuum pump
The electric control gear for being monitored and controlling to adjust vacuum degree in real time.
Invention content
In view of defects in the prior art, it is automatically controlled that the purpose of this utility model is to provide for a kind of dry vacuum mechanical pump
Device, to carry out real time monitoring control to the working condition of dry vacuum mechanical pump.
To achieve these goals, the technical solution of the utility model：
A kind of dry vacuum mechanical pump electric control gear, the electric control gear can control multi-stage vacuum pump group, which is characterized in that
Including：
Pressure sensing cell before the consistent pump group of multiple pump group quantity contained by with the multi-stage vacuum pump group is pressed before each pump group
Power detection unit is connected respectively with vacuum pump group pipelines at different levels；
The Analog input mModule of one or more PLC, respectively with pressure sensing cell before each pump group and
Electronic control unit is connected；
Electronic control unit；
Realize that the electronic control unit carries out the Multi-level networks communication module of data exchange process with host computer；
And multiple AC converters being connected respectively with vacuum pump groups at different levels, the AC converter can be in real time to electricity
Control unit feeds back the status data of itself and the status data of vacuum pump group motor that is connected and performs electronic control unit and issue
Control instruction, to complete to operate the control of the vacuum pump group motor.
It is further preferred that pressure sensing cell uses pressure difference transmitter before the pump group.
It is further preferred that the Analog input mModule of the PLC uses Siemens S300 series input/output modules.
It is further preferred that the electronic control unit uses Siemens's 414-2DP controllers.
It is further preferred that the AC converter uses Siemens 6SE70 series AC converters.
It is further preferred that the Multi-level networks communication module uses Siemens's CP443-1 communication modules.
Compared with prior art, the beneficial effects of the utility model：
For the utility model by the pressure detecting to pump group leading portions at different levels and synchronous adjustment, realizing is not increasing hardware throwing
On the basis of entering, General Promotion automatic control is horizontal, shortens the manually-operated time, hence it is evident that improves production efficiency.
Description of the drawings
Fig. 1 is the electrical block diagram described in the utility model from electric control gear；
Fig. 2 is the circuit structure schematic illustration described in the utility model from electric control gear；
Fig. 3 is the instance graph described in the utility model from the corresponding Adaptable System of electric control gear.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing, to this reality
It is further elaborated with novel.
Dry vacuum mechanical pump electric control gear as Figure 1-Figure 2, the electric control gear can control multi-stage vacuum pump group
Orderly carry out vacuum pumping, including：
Pressure sensing cell before the consistent pump group of multiple pump group quantity contained by with the multi-stage vacuum pump group is pressed before each pump group
Power detection unit is connected respectively with vacuum pump group pipelines at different levels；Pressure sensing cell can detect its place before each pump group
Pressure signal and the pressure signal in vacuum pump group pipeline are converted into electric signal；It is further preferred that it is pressed before the pump group
Power detection unit uses pressure difference transmitter, can every group of pump line road pressure signal be converted to industrial standard 4~20mA telecommunications
Number, by the Analog input mModule of PLC Accurate Determining value is provided for the operation of electronic control unit；
The Analog input mModule of one or more PLC, respectively with pressure sensing cell before each pump group and
Electronic control unit is connected；It is further preferred that the Analog input mModule of the PLC uses Siemens S300 series input and output
Module, the input/output module of the series, which can be realized, inputs the signals such as pressure sensing cell, control button before pump group
The acquisition of output；
Electronic control unit can export corresponding control instruction so that each vacuum pump group motor to be controlled to carry out corresponding pumping behaviour
Make；It is further preferred that the electronic control unit uses Siemens's 414-2DP controllers, it is easy to implement distributed frame and use
Family close friend's HMI interface operations；
Realize that the electronic control unit carries out the Multi-level networks communication module of data exchange process with host computer；Further preferably
, the Multi-level networks communication module uses Siemens's CP443-1 communication modules, by Industrial Ethernet, with host computer into
Row data exchange；
And multiple AC converters being connected respectively with vacuum pump groups at different levels, the AC converter can be in real time to electricity
Control unit feeds back the status data of itself and the status data of vacuum pump group motor that is connected and performs electronic control unit and issue
Control instruction, to complete to operate the control of the vacuum pump group motor.It is further preferred that the AC converter uses
Siemens 6SE70 series AC converters, this Series Frequency Converter can support Profibus-DP networks, be carried out with electronic control unit
Data communication；
In addition, described device can also pass through the corresponding operation data of HMI interfaces input with electronic control unit progress data communication
And order.
In addition, described device can also electronic control unit fed back by the Analog input mModule for the PLC being connected with electronic control unit
Pump group before pressure sensing cell the detection signal current pump group connected to it of detection in real time pressure value, if failing to reach pre-
Constant-pressure then controls the corresponding next stage pump group of current pump group to increase the speed of evacuation i.e. speed of evacuation V0 and becomes Vi (Vi is more than V0)
Realize the carry out vacuum pumping control orderly to entire multi-stage vacuum pump group.
Involved vacuum pumping technology principle is explained simultaneously：Its Pumping characterization curve according to unit acquires vacuum
Hydrogen and the nitrogen content situation of changing with time in room pressure, molten steel carry out calculating distribution, and specific calculating process is：
According to the Pumping equation of vacuum system
It can obtain
I.e.
Wherein：p1For t1The pressure at moment, p2For t2=t1Pressure during+Δ t, QAr=SArp1For argon flow amountFor the flow of protective gas nitrogen, Q1=Slp1For the flow of gas leakage,WithRespectively steel
The hydrogen and the flow of nitrogen generated in water.
It is elaborated below with specific example to herein described scheme：
Vacuum pump group is set as level Four pump group, technological parameter requires to realize that vacuum degree is less than or equal in 20 minutes
0.4kPa, i.e. technique general objective time are 20 minutes；If pump group boot sequence is 4 grades → 3 grades → 4 grades → 1 grade, rate-determining steps
It is as follows：1st, electronic control unit gives the speed of evacuation of pump groups at different levels according to final vacuum degree and process time with optimum state
V0, and give the Best Times for reaching predetermined pressure of pump groups at different levels and initial speed of evacuation V0, i.e. the estimated time respectively pumps
The working time of group is 5 minute, while stepped starting starts and detects the final pressure value of the pump group at different levels within predetermined time, if
Current pump group fails to reach predetermined pressure, then the corresponding next stage pump group of current pump group is controlled to increase the speed of evacuation i.e. speed of evacuation
V0 becomes Vi and passes through warning circuit carrying out warning reminding；Until complete the vacuum pumping control process of whole pump groups.
In addition, in order to further carry out adaptive dynamic regulation to the time of entire technical process, it is also based on above-mentioned
Device amplifies out a self-adapting type dry vacuum mechanical pump electric-control system for adjusting each pump group working time in real time, to move in real time
State adjusts each pump group working time.
Such as Fig. 3, the adaptive control system of the dry vacuum mechanical pump can control multi-stage vacuum pump group, feature
It is, including：Pressure sensing cell before the consistent pump group of multiple pump group quantity contained by with the multi-stage vacuum pump group, before each pump group
Pressure sensing cell is connected respectively with vacuum pump group pipelines at different levels；The Analog input mModule of one or more PLC, point
It is not connected with pressure sensing cell before each pump group and electronic control unit；As the CPU element of electronic control unit, which compiles
Collecting has certain control program, and the control program can export corresponding control according to the preset adaptive computation model that vacuumize
System instruction each vacuum pump group motor to be controlled to be operated accordingly, it is described it is adaptive vacuumize computation model including automatically with to
On the basis of fixed technological parameter, before vacuum pump group motors at different levels is controlled to carry out vacuum pumping, examined based on pressure before each pump group
The pressure signal that unit is detected is surveyed, precalculate and distributes multi-stage vacuum pump group respectively required pumpdown time and pumping speed
Degree, while recalculated when certain level-one vacuum pump group completes vacuum pumping and to distribute remaining vacuum pump groups at different levels respectively required
The pumpdown time and the speed of evacuation wanted, the technological parameter include at least vacuum pressure value and process time；Described in realization
Electronic control unit carries out the Multi-level networks communication module of data exchange process with host computer；And it is multiple respectively with vacuum pump groups at different levels
The AC converter being connected.
It is further preferred that the calculating and assigning process adaptively vacuumized corresponding in computation model includes：
(1), automatically on the basis of the series of given final vacuum pressure value, process time and vacuum pump group, mean allocation
Estimated pumpdown time and the speed of evacuation corresponding to per level-one vacuum pump group, wherein vacuum pump group at different levels to be realized it is true
Pneumatics force value is preset according to user experience；(2), it is true to start the first order for pumpdown time according to expectation and the speed of evacuation
Empty pump group be evacuated and judge first order vacuum pump group reach corresponding vacuum pressure value when used pumpdown time whether
Less than or equal to the estimated pumpdown time, it is to perform (3), otherwise performs (4)；(3), continue according to the estimated pumpdown time
And the speed of evacuation, start next stage vacuum pump group and be evacuated and repeat the deterministic process in (2)；(4), pumping adjustment is performed
Strategy is i.e. automatically using the series of given vacuum pressure value, remaining process time and remaining vacuum pump group as base
Standard, again estimated pumpdown time of the mean allocation corresponding to per level-one vacuum pump group increase the speed of evacuation simultaneously and according to again
It is expected that the increased speed of evacuation of pumpdown time and institute, start this grade of vacuum pump group and be evacuated and judge this grade of vacuum pump group
It reaches whether used pumpdown time during corresponding vacuum pressure value is less than or equal to again estimated pumpdown time, is to perform
(3), pumping adjustable strategies are otherwise performed again；(5), (4) are repeated until completing the pumping process of full vacuum pump group；It is real simultaneously
When judge whether that being currently evacuated the maximum speed of evacuation of the pumpdown time that is expected and vacuum pump group in adjustable strategies can reach
The vacuum pressure value arrived is less than corresponding vacuum pressure value, is to start alarm mechanism.
It is elaborated below with specific example to herein described scheme：
Such as Fig. 3, vacuum pump group is set as level Four pump group, and technological parameter requires to realize that vacuum degree is less than or equal in 20 minutes
0.4kPa, i.e. technique general objective time are 20 minutes；If pump group boot sequence is 4 grades → 3 grades → 4 grades → 1 grade, rate-determining steps
It is as follows：1st, control unit gives the pumping speed of pump groups at different levels according to final vacuum degree and process time with optimum state automatically
Spend V0, then adaptively vacuumize computation model automatically calculate and give pump groups at different levels the Best Times for reaching predetermined pressure and just
The speed of evacuation V0 of beginning, the i.e. working time of estimated time each pump group are 5 minutes, while stepped starting starts；2nd, according to peace
The bleed-off passage pressure detecting signal before the 4 grades of pump groups started at first is put, judges the time for reaching target pressure value.If
Reach in predetermined time or less than the predetermined time, then by given logical continue remaining 3 grades of pump groups startup and sequentially into
Row；If the 3rd, in the 2nd link, deadlines of 4 grades of pump groups is more than the initial time distributed automatically, then by computation model,
Detection previous stage pump group reaches the time used of requirement pressure, makees difference with overall process time, remaining time is put down again
It distributes to pump group below and meets the respective work of technological process total time needs to recalculate remaining three groups of pump groups
Time, and the speed of evacuation of remaining three groups of pump groups is adjusted in real time, and continues the startup of remaining 3 grades of pump groups；Similarly class successively
It pushes away, reaches the control ability of system self-adaption, until completing entire technological process.If in the 3rd link, if by calculating mould
Type even if remaining pump group reaches the maximum speed of evacuation entirely, also can not meet technique in the final pressure value for allowing to require in the time
When, CPU element sends out alarm signal, and operator can according to circumstances carry out manual intervention.
The preferable specific embodiment of the above, only the utility model, but the scope of protection of the utility model is not
This is confined to, in the technical scope that any one skilled in the art discloses in the utility model, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (6)
1. a kind of dry vacuum mechanical pump electric control gear, the electric control gear can control multi-stage vacuum pump group, which is characterized in that packet
It includes：
Pressure sensing cell before the consistent pump group of multiple pump group quantity contained by with the multi-stage vacuum pump group, pressure is examined before each pump group
Unit is surveyed respectively with vacuum pump group pipelines at different levels to be connected；
The Analog input mModule of one or more PLC, respectively with pressure sensing cell before each pump group and automatically controlled
Unit is connected；
Electronic control unit；
Realize that the electronic control unit carries out the Multi-level networks communication module of data exchange process with host computer；
And multiple AC converters being connected respectively with vacuum pump groups at different levels, the AC converter can be in real time to automatically controlled lists
The status data of member feedback itself and the status data of vacuum pump group motor connected simultaneously perform the control that electronic control unit issues
System instruction is operated with the control completed to the vacuum pump group motor.
2. dry vacuum mechanical pump electric control gear according to claim 1, it is characterised in that：
Pressure sensing cell uses pressure difference transmitter before the pump group.
3. dry vacuum mechanical pump electric control gear according to claim 1, it is characterised in that：
The Analog input mModule of the PLC uses Siemens S300 series input/output modules.
4. dry vacuum mechanical pump electric control gear according to claim 1, it is characterised in that：
The electronic control unit uses Siemens's 414-2DP controllers.
5. dry vacuum mechanical pump electric control gear according to claim 1, it is characterised in that：
The AC converter uses Siemens 6SE70 series AC converters.
6. dry vacuum mechanical pump electric control gear according to claim 1, it is characterised in that：
The Multi-level networks communication module uses Siemens's CP443-1 communication modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721817615.9U CN207541486U (en) | 2017-12-22 | 2017-12-22 | Dry vacuum mechanical pump electric control gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721817615.9U CN207541486U (en) | 2017-12-22 | 2017-12-22 | Dry vacuum mechanical pump electric control gear |
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| Publication Number | Publication Date |
|---|---|
| CN207541486U true CN207541486U (en) | 2018-06-26 |
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ID=62619071
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721817615.9U Active CN207541486U (en) | 2017-12-22 | 2017-12-22 | Dry vacuum mechanical pump electric control gear |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456751A (en) * | 2019-08-16 | 2019-11-15 | 建龙北满特殊钢有限责任公司 | A kind of pneumatic steelmaking control system |
| CN114415587A (en) * | 2022-01-20 | 2022-04-29 | 中国科学院上海高等研究院 | Adiabatic vacuum data acquisition control system and method for test station |
-
2017
- 2017-12-22 CN CN201721817615.9U patent/CN207541486U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456751A (en) * | 2019-08-16 | 2019-11-15 | 建龙北满特殊钢有限责任公司 | A kind of pneumatic steelmaking control system |
| CN114415587A (en) * | 2022-01-20 | 2022-04-29 | 中国科学院上海高等研究院 | Adiabatic vacuum data acquisition control system and method for test station |
| CN114415587B (en) * | 2022-01-20 | 2023-09-29 | 中国科学院上海高等研究院 | Testing station heat insulation vacuum data acquisition control system and method |
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