CN109880975A - A kind of big machinery vacuum system is without by-pass governing method - Google Patents
A kind of big machinery vacuum system is without by-pass governing method Download PDFInfo
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- CN109880975A CN109880975A CN201910256147.XA CN201910256147A CN109880975A CN 109880975 A CN109880975 A CN 109880975A CN 201910256147 A CN201910256147 A CN 201910256147A CN 109880975 A CN109880975 A CN 109880975A
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Abstract
The invention discloses a kind of big machinery vacuum systems without by-pass governing method, method and step includes: that building big machinery vacuum system does not design by-pass line, when mechanical vacuum system starting vacuumizes, first starting faces the thick pumping grade vacuum pump of atmosphere, bad student's pressure difference is imported and exported in the other vacuum pumps at different levels of system, then freely vacuum pumps at different levels is driven to be freely rotated step by step using every grade of vacuum pump inlet outlet pressure differential, formation vacuumizes airflow channel, obtains every vacuum pump actual rotation frequency by the frequency function of catching that every grade of vacuum pump controls frequency converter.After system vacuum pumps at different levels obtain starting control instruction, control frequency converter starts vacuum pump by catching frequency step by step.This method solves big machinery vacuum system, vacuumizes that volume fraction is high, control valve is more, valve leaks the problems such as cause to impact to system vacuum pump in vain, so that the mechanical vacuum system configured is more energy-efficient.
Description
Technical field
The present invention relates to vacuum melting technique fields, and in particular to a kind of big machinery vacuum system is without by-pass governing side
Method.
Background technique
It is usually more by dividing again after more vacuum pump parallel combinations currently used for the big machinery vacuum system of vacuum metling
Grade tandem compound forms.In order to which vacuum pumps at different levels in control system are all design by-pass lines, control valve is configured, valve is passed through
Start vacuum pump, the purpose that realization system vacuumizes step by step with vacuum pump chain control.But this control mode is lacked there are following
It falls into, vacuumizes volume fraction height in vain, by-pass line designed by system can only play control action, take out again after broken sky every time true
When empty all vacuumize repeatedly again；It is more to participate in system control valve door, controls relative complex；Since mechanical vacuum system is at different levels true
Empty pump work state is different, once bypath valve gas leakage can have an immense impact on to vacuum pump not at the same level in system, even
System vacuum pumps at different levels are caused to break down.
Summary of the invention
The technical solution that the present invention uses for the above technical issues are as follows: a kind of big machinery vacuum system is controlled without bypass
Method processed, comprising the following steps:
(1) building big machinery vacuum system does not design by-pass line.
(2) for mechanical vacuum system when starting vacuumizes, first starting faces the thick pumping grade vacuum pump of atmosphere.
(3) the other vacuum pump inlet and outlet at different levels of vacuum system generate pressure difference.
(4) pressure difference freely drives vacuum pumps at different levels step by step, and formation vacuumizes airflow channel.
(5) the vacuum pump rotational frequency of every grade of vacuum pump control frequency converter catching frequency Function detection and being pushed to pressure difference.
(6) according to system control instruction, using the vacuum pump rotational frequency catching frequency Function detection and pushing to pressure difference as initial
Frequency carries out subsequent control, starts vacuum pumps at different levels.
Specifically, constructed big machinery vacuum system need not design complicated bypass control valve (BCV) and by-pass line.
Specifically, when mechanical vacuum system starts, according to given frequency when except the thick pumping grade vacuum pump startup for facing atmosphere
Starting is outer, and other vacuum pumps at different levels are freely rotated by pressure difference promotion, automatically forms evacuation passageway.
Specifically, when mechanical vacuum system starts, in addition to the forepump in face of atmosphere is according to given frequency starting,
Its vacuum pump startup at different levels captures its frequency under pressure difference promotion by controlling frequency converter, and starts as original frequency.
Compared with prior art, the advantages and positive effects of the present invention are, propose a kind of big machinery vacuum system
Without by-pass governing method, solves the problems, such as that big machinery vacuum system control valve is more, it is high to vacuumize volume fraction in vain, make
It is more energy-efficient to obtain configured mechanical vacuum system.The present invention is further simplified big machinery vacuum pump system pipeline and matches
It sets, reduces equipment investment；It greatly reduces big machinery vacuum system and vacuumizes volume fraction, energy efficiency in vain；Significantly
Reduce system control valve door, so that the control of big machinery vacuum system more optimizes；Bypath valve leakage is eliminated to large size
Mechanical vacuum system vacuum pumps at different levels generate enormous impact, significantly reduce big machinery vacuum system operation troubles.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, for ability
For the those of ordinary skill of domain, without any creative labor, it can also be obtained according to these attached drawings others
Attached drawing.
Fig. 1 is control method flow chart of the invention；
Fig. 2 is structural schematic diagram of the invention；
Fig. 3 is existing conventional techniques method structural schematic diagram；
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawings and examples
The present invention will be further described.It should be noted that in the absence of conflict, in embodiments herein and embodiment
Feature can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other modes described herein are different from, therefore, the present invention is not limited to the specific of specification is described below
The limitation of embodiment.
A kind of big machinery vacuum system is without by-pass governing method, comprising the following steps:
(1) building big machinery vacuum system does not design by-pass line.
(2) for mechanical vacuum system when starting vacuumizes, first starting faces the thick pumping grade vacuum pump of atmosphere.
(3) the other vacuum pump inlet and outlet at different levels of vacuum system generate pressure difference.
(4) pressure difference freely drives vacuum pumps at different levels step by step, and formation vacuumizes airflow channel.
(5) the vacuum pump rotational frequency of every grade of vacuum pump control frequency converter catching frequency Function detection and being pushed to pressure difference.
(6) according to system control instruction, using the vacuum pump rotational frequency catching frequency Function detection and pushing to pressure difference as initial
Frequency carries out subsequent control, starts vacuum pumps at different levels.
Constructed big machinery vacuum system need not design complicated bypass control valve (BCV) and by-pass line.
When mechanical vacuum system starts, in addition to when facing the thick pumping grade vacuum pump startup of atmosphere according to given frequency starting,
Other vacuum pumps at different levels are freely rotated by pressure difference promotion, automatically form evacuation passageway.
It is other at different levels in addition to the forepump in face of atmosphere is according to given frequency starting when mechanical vacuum system starts
Vacuum pump startup captures its frequency under pressure difference promotion by controlling frequency converter, and starts as original frequency.
RH refining vacuum system is made steel by level Four vacuum pump group at wherein slightly taking out grade is screw vacuum pump, other three-levels are
Lobe pump.After system obtains enabled instruction, thick grade screw vacuum pump of taking out first starts, and generates vacuum in rear class lobe pump prime,
Lobe pump inlet and outlet at different levels generate pressure difference and push it to be freely rotated step by step, form airflow channel.Become when vacuum pumps at different levels control
After frequency device obtains vacuum pump rotational frequencies at different levels and enabled instruction, according to actual rotation frequency starting vacuum pump to realize complete set
System starting not only reduces the impact of vacuum pump startup, without controlling vacuum pump startups at different levels by by-pass line.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (4)
1. a kind of big machinery vacuum system is without by-pass governing method, which comprises the following steps:
(1) building big machinery vacuum system does not design by-pass line；
(2) for mechanical vacuum system when starting vacuumizes, first starting faces the thick pumping grade vacuum pump of atmosphere；
(3) the other vacuum pump inlet and outlet at different levels of vacuum system generate pressure difference；
(4) pressure difference freely drives vacuum pumps at different levels step by step, and formation vacuumizes airflow channel；
(5) the vacuum pump rotational frequency of every grade of vacuum pump control frequency converter catching frequency Function detection and being pushed to pressure difference；
(6) according to system control instruction, using the vacuum pump rotational frequency catching frequency Function detection and pushing to pressure difference as original frequency
Subsequent control is carried out, vacuum pumps at different levels are started.
2. a kind of big machinery vacuum system according to claim 1 is without by-pass governing method, it is characterised in that: constructed
Big machinery vacuum system need not design complicated bypass control valve (BCV) and by-pass line.
3. a kind of big machinery vacuum system according to claim 1 or 2 is without by-pass governing method, it is characterised in that: machine
It is other at different levels true in addition to when facing the thick pumping grade vacuum pump startup of atmosphere according to given frequency starting when tool vacuum system starts
Sky pump is freely rotated by pressure difference promotion, automatically forms evacuation passageway.
4. a kind of big machinery vacuum system according to claim 1 or 2 is without by-pass governing method, it is characterised in that: machine
When tool vacuum system starts, in addition to the forepump in face of atmosphere is according to given frequency starting, other vacuum pump startups at different levels
Its frequency under pressure difference promotion is captured by controlling frequency converter, and is started as original frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910256147.XA CN109880975B (en) | 2019-04-01 | 2019-04-01 | Bypass-free control method for large mechanical vacuum system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910256147.XA CN109880975B (en) | 2019-04-01 | 2019-04-01 | Bypass-free control method for large mechanical vacuum system |
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| CN109880975A true CN109880975A (en) | 2019-06-14 |
| CN109880975B CN109880975B (en) | 2021-04-23 |
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| CN106399639A (en) * | 2016-01-19 | 2017-02-15 | 陈莉菲 | Dry type mechanical vacuum pump degassing system and method for liquid steel secondary refining |
| CN106762538A (en) * | 2017-03-29 | 2017-05-31 | 山东钢铁集团日照有限公司 | Large-scale dry-type mechanical vacuum system intermediate pump stacks arrangement and replacing options |
| CN108180144A (en) * | 2018-01-03 | 2018-06-19 | 上海宽量节能投资有限公司 | A kind of mechanical pump group composing method and its mechanical pump system for liquid steel degassing is united |
| CN108424996A (en) * | 2018-04-04 | 2018-08-21 | 中冶南方工程技术有限公司 | The emulation mode of dry type oil-sealed rotary pump pumping process for RH vacuum refinings |
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2019
- 2019-04-01 CN CN201910256147.XA patent/CN109880975B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129164A (en) * | 1976-03-15 | 1978-12-12 | Mitsubishi Jukogyo Kabushiki Kaisha | Vacuum forming or reduced-pressure moulding |
| US4798521A (en) * | 1986-05-02 | 1989-01-17 | Leybold-Heraeus Gmbh | System and method for regulating pressure in a container |
| JPS63123108A (en) * | 1986-11-13 | 1988-05-26 | Toshiba Corp | Vacuum control device |
| JPH04176811A (en) * | 1990-11-08 | 1992-06-24 | Sumitomo Metal Ind Ltd | Method for controlling vacuum degree in rh vacuum vessel |
| CN102943151A (en) * | 2012-10-24 | 2013-02-27 | 杭州杭真真空工程技术有限公司 | Steel liquid vacuum refinement system adopting complete-dry type mechanical vacuum pump |
| CN204627988U (en) * | 2014-12-30 | 2015-09-09 | 烟台沃尔姆真空技术有限公司 | The series connection Roots vacuum system that can simultaneously start |
| CN105483330A (en) * | 2015-06-18 | 2016-04-13 | 上海伊莱茨真空技术有限公司 | Vacuum system for vacuum degassing smelting furnace, and control method thereof |
| CN106399639A (en) * | 2016-01-19 | 2017-02-15 | 陈莉菲 | Dry type mechanical vacuum pump degassing system and method for liquid steel secondary refining |
| CN106762538A (en) * | 2017-03-29 | 2017-05-31 | 山东钢铁集团日照有限公司 | Large-scale dry-type mechanical vacuum system intermediate pump stacks arrangement and replacing options |
| CN108180144A (en) * | 2018-01-03 | 2018-06-19 | 上海宽量节能投资有限公司 | A kind of mechanical pump group composing method and its mechanical pump system for liquid steel degassing is united |
| CN108424996A (en) * | 2018-04-04 | 2018-08-21 | 中冶南方工程技术有限公司 | The emulation mode of dry type oil-sealed rotary pump pumping process for RH vacuum refinings |
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| CN109880975B (en) | 2021-04-23 |
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