CN107559200A - Balanced type Roots vacuum pumping system and its control method - Google Patents

Balanced type Roots vacuum pumping system and its control method Download PDF

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Publication number
CN107559200A
CN107559200A CN201711062951.1A CN201711062951A CN107559200A CN 107559200 A CN107559200 A CN 107559200A CN 201711062951 A CN201711062951 A CN 201711062951A CN 107559200 A CN107559200 A CN 107559200A
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max
work
vaccum pump
roots
pump
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CN107559200B (en
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陈首挺
徐世誉
李松峰
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Guangdong Kenfulai Pump Co Ltd
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Guangdong Kenfulai Pump Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
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Abstract

The present invention relates to Roots vacuum pump technical field, particularly a kind of balanced type Roots vacuum pumping system；Including Roots vaccum pump, condenser, testing agency and DCS system；The both sides of the pump housing of Roots vaccum pump are respectively arranged with refluxing opening, and automatic regulating valve is provided with refluxing opening；Condenser is arranged on the gas outlet of Roots vaccum pump, is connected between condenser and refluxing opening by pipeline；Pressure sensor a and pressure sensor b are separately positioned on the air inlet pipeline and discharge line of Roots vaccum pump, and temperature sensor is arranged on the discharge line of Roots vaccum pump；The present invention can use as common Roots vaccum pump and air cooling lobe pump simultaneously, versatile, the scope of application is extremely wide；The advantages of having taken into account two kinds of lobe pumps simultaneously, atm number can be provided in the case where needing atm number, big pressure difference can also be provided when needing big pressure difference；Present invention also offers the control method of the system.

Description

Balanced type Roots vacuum pumping system and its control method
Technical field
The present invention relates to Roots vacuum pump technical field, particularly a kind of balanced type Roots vacuum pumping system and its controlling party Method.
Background technology
Roots vaccum pump can divide three major types by its purposes, one is common Roots vaccum pump, is applied at present widely The fields such as vacuum metling, vacuum coating, vacuum impregnation, medication chemistry, the empty simulation of space flight；The second is air-cooled Roots vacuum pump, Rotor is directly cooled down using the gas or air of cooling, improves the heat resistance of Roots vaccum pump, therefore suitable for high temperature, height The operating mode that the common Roots vaccum pump such as compression ratio and High Pressure Difference can not be born, such as some electric power and petrochemical industry field；It is third, wet Formula (water cooling) Roots vaccum pump, such vavuum pump are injected directly into small amount of water from air entry and carry out cooling gas, structure and conventional sieve For thatch vavuum pump compared to more complicated, operation noise is big, is mainly used in papermaking and industrial dedusting industry, scope of application relative narrower.Mesh The producer of the preceding Roots vaccum pump of production both at home and abroad is very more, is all mainly the common Roots vaccum pump of production and ventilation type Roots vacuum Pump, and it is most to produce the producer of common Roots vaccum pump.
Common Roots vaccum pump is a kind of two-spool positive-displacement vacuum pump, and two rotors rotate at a high speed in the opposite direction, two The space that person is combined into the pump housing constantly changes and sucks and discharge gas, between being between rotor and rotor, rotor and the pump housing Gap coordinates.Roots vaccum pump caused heat during compressed action can be passed on rotor and the pump housing, and the heat of rotor is difficult To pass to outside, and the heat of the pump housing is easily dispersed into air, and both the temperature difference occur coefficient of thermal expansion can be caused to differ causing Fit clearance reduces even stuck.Therefore, the live load of common Roots vaccum pump and pressure difference are all limited to, and to processing The heat endurance of precision, assembly precision and material has higher requirement, at present the Roots vaccum pump of domestic production and the world The vavuum pump difference of first-class manufacturer production is also mainly in terms of reliability.Air-cooled Roots vacuum pump is used, although energy The heat resistance of Roots vaccum pump is improved, but the backflow of gas can reduce the pumping efficiency of lobe pump, and to realize rotor To the sealing of refluxing opening during pumping, inevitable requirement rotor volume, which increases, causes effective pump down volume to decline, therefore ventilation type Roots Vavuum pump it is relatively inefficient.Because the different from those of two kinds of lobe pumps is larger, both are substantially unable to used interchangeably, general Property is poor.
The content of the invention
, can be according to the work of reality it is an object of the invention to provide a kind of balanced type Roots vacuum pumping system and control method The requirement of condition, the aperture of backflow cooling gas piping is automatically adjusted, realizes that Roots vaccum pump can be used as common Roots vacuum simultaneously Pump and air cooling lobe pump use, the advantages of having both two kinds of lobe pumps, on the premise of Roots vaccum pump reliable operation is ensured, as far as possible Improve the performance of Roots vaccum pump.
To reach above-mentioned function, technical scheme provided by the invention is：
A kind of balanced type Roots vacuum pumping system, including Roots vaccum pump, condenser, testing agency and DCS system；
The both sides of the pump housing of the Roots vaccum pump are respectively arranged with refluxing opening, are provided with and automatically adjust on the refluxing opening Valve；
The condenser is arranged on the gas outlet of the Roots vaccum pump, is led between the condenser and the refluxing opening Cross pipeline connection；
The testing agency includes pressure sensor a, pressure sensor b and temperature sensor, the pressure sensor a and The pressure sensor b is separately positioned on the air inlet pipeline and discharge line of the Roots vaccum pump, the temperature sensor It is arranged on the discharge line of the Roots vaccum pump；
DCS system includes input module, output module, memory module and processor；The input module and the pressure The sensor a and pressure sensor b and temperature sensor electrical connection；The input module is used to receive the pressure biography The inlet pressure P of the Roots vaccum pump of sensor a and pressure sensor b detectionsIWith outlet pressure P0, the temperature sensor The outlet exhaust temperatures T of the Roots vaccum pump of detection0, and PI、P0And T0Send processor to；
The memory module electrically connects with the processor, for storing pre-set Pmin、Pmax、n、TmaxWith permit Perhaps abnormal condition duration t initial value and various work condition state (PminIt is that Roots vacuum pump intake absolute pressure permits Perhaps minimum value, PmaxIt is the maximum that Roots vacuum pump intake absolute pressure allows, n is selected when being Roots vaccum pump design selection Compression ratio, TmaxIt is the maximum that Roots vaccum pump outlet exhaust temperatures allow)；
The processor is the P receivedI、P0And T0Compared with the preset value in the memory, selection is corresponding Operating mode, and generate control signal；
The output module is electrically connected with processor and the automatic regulating valve, and the output module is adjusted according to control signal Save the aperture of the automatic regulating valve.
Present invention also offers the control method of above-mentioned balanced type Roots vacuum pumping system, comprise the following steps,
S1, DCS system read PI、P0And T0Numerical value；
S2, DCS system compared with the numerical value set, determine balanced type Roots vaccum pump system according to the numerical value received Which kind of work condition state system is in；
S3, DCS system are signaled to automatic regulating valve according to work condition state numbering, and automatic regulating valve performs corresponding dynamic Make；
If the duration that S4, balanced type Roots vaccum pump systems stay are in abnormal condition exceedes setting value t, DCS System signal an alert, and show abnormal condition explanation.
Preferably, slowly changed by per second 1% aperture when automatic regulating valve changes aperture.
Preferably, the action relationships that the work condition state and automatic regulating valve perform are as follows：
1. work as PI＞ Pmax、Po≤n×Pmax、To≤TmaxWhen, automatic regulating valve is fully closed；
2. work as Pmin≤PI≤Pmax、Po≤n×Pmax、To≤TmaxWhen, automatic regulating valve is motionless；
3. work as PI＜ Pmin、Po≤n×Pmax、To≤TmaxWhen, automatically adjust valve opening increasing；
4. work as PI＞ Pmax、Po＞ n × Pmax、To≤TmaxWhen, automatically adjust valve opening reduction；
5. work as Pmin≤PI≤Pmax、Po＞ n × Pmax、To≤TmaxWhen, automatically adjust valve opening increasing；
6. work as PI＜ Pmin、Po＞ n × Pmax、To≤TmaxWhen, automatically adjust valve opening increasing；
7. work as PI＞ Pmax、Po≤n×Pmax、To＞ TmaxWhen, automatically adjust valve opening increasing；
8. work as Pmin≤PI≤Pmax、Po≤n×Pmax、To＞ TmaxWhen, automatically adjust valve opening increasing；
9. work as PI＜ Pmin、Po≤n×Pmax、To＞ TmaxWhen, automatically adjust valve opening increasing；
10. work as PI＞ Pmax、Po＞ n × Pmax、To＞ TmaxWhen, automatically adjust valve opening increasing；
11. work as Pmin≤PI≤Pmax、Po＞ n × Pmax、To＞ TmaxWhen, automatically adjust valve opening increasing；
12. work as PI＜ Pmin、Po＞ n × Pmax、To＞ TmaxWhen, automatically adjust valve opening increasing.
The beneficial effects of the present invention are：
1st, balanced type Roots vacuum pumping system can use as common Roots vaccum pump and air cooling lobe pump simultaneously, versatility By force, the scope of application is extremely wide；
2nd, the advantages of having taken into account two kinds of lobe pumps, advantage maximum can be realized according to the different Operating condition adjustments performance of itself Change, atm number can be provided in the case where needing atm number, big pressure difference can also be provided when needing big pressure difference；
3rd, system possesses self-diagnosing function, can determine whether Roots vacuum pump work is normal according to the parameter of operation, together When can self adjustment avoid lobe pump from the situation of excess load occur, greatly improve the reliability of lobe pump, be also convenient for using And maintenance.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment one.
Embodiment
1 the present invention is further elaborated below in conjunction with the accompanying drawings：
Embodiment one：
A kind of balanced type Roots vacuum pumping system as shown in Figure 1, including Roots vaccum pump 1, condenser 7, testing agency With DCS system 4；The both sides of the pump housing of Roots vaccum pump 1 are respectively arranged with refluxing opening 11, are provided with and automatically adjust on refluxing opening 11 Valve 3；Condenser 7 is arranged on the gas outlet of Roots vaccum pump 1, is connected between condenser 7 and refluxing opening 11 by pipeline 6；Inspection Surveying mechanism includes b8 points of pressure sensor a2, pressure sensor b8 and temperature sensor 5, pressure sensor a2 and pressure sensor It is not arranged on the air inlet pipeline and discharge line of Roots vaccum pump 1, temperature sensor 5 is arranged on the discharge of Roots vaccum pump 1 On pipeline.
DCS system 4 includes input module, output module, memory module and processor；Input module and pressure sensor a2 Electrically connected with pressure sensor b8 and temperature sensor 5；Input module is used to receive pressure sensor a2 and pressure sensor b8 The inlet pressure P of the Roots vaccum pump 1 of detectionIWith outlet pressure P0, the outlet row for the Roots vaccum pump 1 that temperature sensor 5 detects Temperature degree T0, and PI、P0And T0Send processor to；Memory module electrically connects with processor, pre-set for storing Pmin、Pmax、n、TmaxWith the initial value and various work condition states, explanation and automatic tune for allowing abnormal condition duration t Save the action to be performed of valve 3.Processor is the P receivedI、P0And T0Compared with the preset value in memory, selection is corresponding Operating mode, and generate control signal；Output module electrically connects with processor and the automatic regulating valve 3, and output module is according to control Signal control automatic regulating valve 3 processed is turned on and off.
Above-mentioned PminBe the entrance absolute pressure of Roots vaccum pump 1 allow minimum value, PmaxIt is that the entrance of Roots vaccum pump 1 is absolute The maximum that pressure allows, the compression ratio that n is selected when being 1 design selection of Roots vaccum pump, TmaxIt is the outlet of Roots vaccum pump 1 row The maximum that temperature degree allows.
Present invention also offers the control method of above-mentioned balanced type Roots vacuum pumping system.It is balanced type Roots vacuum below The action relationships that work condition state numbering, work condition state, explanation and the automatic regulating valve of pumping system perform：
It is the control method of balanced type Roots vacuum pumping system below, step is as follows：
S1, DCS system 4 read PI、P0And T0Numerical value；
S2, DCS system 4 compared with the numerical value set, determine balanced type Roots vaccum pump according to the numerical value received Which kind of work condition state is system be in；
S3, DCS system 4 are signaled to automatic regulating valve 3 according to work condition state numbering, and automatic regulating valve 3 performs accordingly Action；
If S4, balanced type Roots vaccum pump systems stay are in the duration of abnormal condition (i.e. status number is not 2) More than setting value t, the then signal an alert of DCS system 4, and show abnormal condition explanation.
To avoid fluctuation too big when being adjusted for automatic regulating valve 3, when automatic regulating valve 3 changes aperture by per second 0.5%~ 2% aperture is slowly changed, and in the present embodiment, automatic regulating valve 3 is slowly changed by per second 1% aperture.
Embodiment two：
In the present embodiment, the meter suction pressure allowed band that vacuum system needs is 40~60mbar (A), Roots vacuum The type selecting compression ratio of pump 1 is 3, and limit delivery temperature is 100 DEG C, and setting allows abnormal condition duration t=10 minutes, i.e., Pmin=40mbar, Pmax=60mbar, n=3, Tmax=100 DEG C.
Above-mentioned predetermined value is inputted in DCS system 4 first, the system is controlled by following steps.
The inlet pressure P of S1, pressure sensor and temperature sensor 5 Roots vaccum pump 1I, outlet pressure P0Arranged with outlet Temperature degree ToIt is transferred in DCS system 4；
S2, DCS system 4 compared with the numerical value set, determine balanced type Roots vaccum pump according to the data received Which kind of state is system be in, for example during firm startup Roots vaccum pump 1, system mode is in numbering (1)；
S3, DCS system 4 act according to corresponding to status number (1) and are signaled to automatic regulating valve 3, automatic regulating valve 3 Fully closed, now the tolerance of Roots vaccum pump 1 is maximum, can be rapidly achieved the pressure value of system requirements；
If the state of system changes, for example becomes status number (3), DCS system 4 is further according to status number (3) Corresponding action is signaled to automatic regulating valve 3, and automatic regulating valve 3 slowly increases aperture, and the condensed device 7 of gas of discharge is cold But after, it is back to by pipeline 6 in the pump chamber of Roots vaccum pump 1, plays a part of cooling down rotor and balance pressure, until system Become the aperture that status number (2) just stops increasing automatic regulating valve 3；
If S4, balanced type Roots vaccum pump systems stay are in abnormal condition (i.e. status number is not (2)) duration More than setting value t=10 minutes, it can not still recover normal condition after automatically adjusting, then the signal an alert of DCS system 4, and Abnormal condition explanation is shown, asks operating personnel to pay attention to, needs shutdown inspection equipment if necessary.
The balanced type Roots vacuum pumping system of the application and existing common Roots vaccum pump and air-cooled roots vacuum pump Performance comparision is as follows：
The advantages of common Roots vaccum pump is due to no reflux gas in the case of tolerance identical is aspirated, therefore is consumed Power ratio air-cooled roots vacuum pump is much smaller；Shortcoming be compression ratio become it is big when can generate heat it is stuck.
The advantages of air-cooled roots vacuum pump is that have reflux gas to cool down rotor, be not easy when compression ratio is big it is stuck, therefore can be with Operating mode for larger compression ratio；Shortcoming is that existing reflux gas can cause power attenuation to increase always, and mechanical efficiency is relatively low.
Conventional air-cooled roots vacuum pump can also be used as common Roots vaccum pump use in fact, simply identical operating mode Under, the power for the lobe pump that is gas-cooled will significantly increase, therefore generally can not change use.And common Roots vaccum pump is because cannot be used for Big compression ratio, therefore can not be used to replace air-cooled roots vacuum pump.
And if balance equivalent to one common Roots vaccum pump when shape Roots vaccum pump shuts control valve, if adjust Equivalent to the air-cooled roots vacuum pump of a routine during section valve wide open.So it can both be used as common Roots vaccum pump It can be used again as air-cooled roots vacuum pump.And its more situation is neither to shut valve, also not standard-sized sheet valve, used in one The state of individual centre, and the aperture of valve can be automatically adjusted according to the change of operating mode, so as to realize the regulation of self performance. Therefore, balanced type Roots vacuum pumping system can use as common Roots vaccum pump and air cooling lobe pump simultaneously, versatile, suitable It is extremely wide with scope；The application has taken into account the advantages of common and two kinds of lobe pumps of air cooling simultaneously, can be according to different Operating condition adjustments certainly The performance of body, realizes maximum advantage, and atm number can be provided in the case where needing atm number, can also when needing big pressure difference Big pressure difference is provided.
Detect data to show, the air cooling lobe pump of balanced type Roots vacuum pumping system of the invention compared with conventional same size Maximum tolerance can lift 20%, and maximum compression ratio is 17 times of the common Roots vaccum pump of same size.

Claims (4)

  1. A kind of 1. balanced type Roots vacuum pumping system, it is characterised in that：Including Roots vaccum pump, condenser, testing agency and DCS System；
    The both sides of the pump housing of the Roots vaccum pump are respectively arranged with refluxing opening, and automatic regulating valve is provided with the refluxing opening；
    The condenser is arranged on the gas outlet of the Roots vaccum pump, passes through pipe between the condenser and the refluxing opening Road connects；
    The testing agency includes pressure sensor a, pressure sensor b and temperature sensor, the pressure sensor a and described Pressure sensor b is separately positioned on the air inlet pipeline and discharge line of the Roots vaccum pump, and the temperature sensor is set On the discharge line of the Roots vaccum pump；
    DCS system includes input module, output module, memory module and processor；The input module and the pressure sensing The device a and pressure sensor b and temperature sensor electrical connection；The input module is used to receive the pressure sensor The inlet pressure P of the Roots vaccum pump of a and pressure sensor b detectionsIWith outlet pressure P0, the temperature sensor detection Roots vaccum pump outlet exhaust temperatures T0, and PI、P0And T0Send processor to；
    The memory module electrically connects with the processor, for storing pre-set Pmin、Pmax、n、TmaxIt is non-with permission Normal condition duration t initial value and various work condition state (PminIt is that Roots vacuum pump intake absolute pressure allows Minimum value, PmaxIt is the maximum that Roots vacuum pump intake absolute pressure allows, n is selected when being Roots vaccum pump design selection Compression ratio, TmaxIt is the maximum that Roots vaccum pump outlet exhaust temperatures allow)；
    The processor is the P receivedI、P0And T0Compared with the preset value in the memory, corresponding work is selected Condition, and generate control signal；
    The output module electrically connects with processor and the automatic regulating valve, and the output module adjusts institute according to control signal State the aperture of automatic regulating valve.
  2. A kind of 2. control method of balanced type Roots vacuum pumping system as claimed in claim 1, it is characterised in that：Including following Step,
    S1, DCS system read PI、P0And T0Numerical value；
    S2, DCS system compared with the numerical value set, are determined at balanced type Roots vacuum pumping system according to the numerical value received In which kind of work condition state；
    S3, DCS system are signaled to automatic regulating valve according to work condition state numbering, and automatic regulating valve performs corresponding action；
    If the duration that S4, balanced type Roots vaccum pump systems stay are in abnormal condition exceedes setting value t, DCS system Signal an alert, and show abnormal condition explanation.
  3. 3. balanced type Roots vacuum pumping system as claimed in claim 2, it is characterised in that：Automatic regulating valve is pressed when changing aperture Per second 0.5%~2% aperture slowly changes.
  4. 4. balanced type Roots vacuum pumping system as claimed in claim 2 or claim 3, it is characterised in that：The work condition state and from The action relationships that dynamic regulating valve performs are as follows：
    1. work as PI＞ Pmax、PO≤n×Pmax、TO≤TmaxWhen, automatic regulating valve is fully closed；
    2. work as Pmin≤PI≤Pmax、PO≤n×Pmax、TO≤TmaxWhen, automatic regulating valve is motionless；
    3. work as PI＜ Pmin、PO≤n×Pmax、TO≤TmaxWhen, automatically adjust valve opening increasing；
    4. work as PI＞ Pmax、PO＞ n × Pmax、TO≤TmaxWhen, automatically adjust valve opening reduction；
    5. work as Pmin≤PI≤Pmax、PO＞ n × Pmax、TO≤TmaxWhen, automatically adjust valve opening increasing；
    6. work as PI＜ Pmin、PO＞ n × Pmax、TO≤TmaxWhen, automatically adjust valve opening increasing；
    7. work as PI＞ Pmax、PO≤n×Pmax、TO＞ TmaxWhen, automatically adjust valve opening increasing；
    8. work as Pmin≤PI≤Pmax、PO≤n×Pmax、TO＞ TmaxWhen, automatically adjust valve opening increasing；
    9. work as PI＜ Pmin、PO≤n×Pmax、TO＞ TmaxWhen, automatically adjust valve opening increasing；
    10. work as PI＞ Pmax、PO＞ n × Pmax、TO＞ TmaxWhen, automatically adjust valve opening increasing；
    11. work as Pmin≤PI≤Pmax、PO＞ n × Pmax、TO＞ TmaxWhen, automatically adjust valve opening increasing；
    12. work as PI＜ Pmin、PO＞ n × Pmax、TO＞ TmaxWhen, automatically adjust valve opening increasing.
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