CN107559200B - Balanced Roots vacuum pump system and control method thereof - Google Patents
Balanced Roots vacuum pump system and control method thereof Download PDFInfo
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- 238000010992 reflux Methods 0.000 claims abstract description 7
- 230000002159 abnormal effect Effects 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 11
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- 230000000875 corresponding effect Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 5
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- 238000003723 Smelting Methods 0.000 description 1
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Abstract
The invention relates to the technical field of Roots vacuum pumps, in particular to a balanced Roots vacuum pump system; comprises a Roots vacuum pump, a condenser, a detection mechanism and a DCS system; the two sides of the pump body of the Roots vacuum pump are respectively provided with a return port, and an automatic regulating valve is arranged on the return port; the condenser is arranged on the air outlet of the Roots vacuum pump, and the condenser is connected with the reflux port through a pipeline; the pressure sensor a and the pressure sensor b are respectively arranged on an air inlet pipeline and a discharge pipeline of the Roots vacuum pump, and the temperature sensor is arranged on the discharge pipeline of the Roots vacuum pump; the invention can be used as a common Roots vacuum pump and an air-cooled Roots pump at the same time, and has strong universality and extremely wide application range; meanwhile, the advantages of the two Roots pumps are taken into consideration, so that the large air quantity can be provided under the condition of needing the large air quantity, and the large pressure difference can be provided under the condition of needing the large pressure difference; the invention also provides a control method of the system.
Description
Technical Field
The invention relates to the technical field of Roots vacuum pumps, in particular to a balanced Roots vacuum pump system and a control method thereof.
Background
The Roots vacuum pump can be divided into three categories according to the application, namely, a common Roots vacuum pump is widely applied to the fields of vacuum smelting, vacuum coating, vacuum impregnation, pharmaceutical chemical industry, space flight simulation and the like at present; secondly, the air-cooled Roots vacuum pump directly cools the rotor by using cooled gas or atmosphere, so that the heat resistance of the Roots vacuum pump is improved, and the air-cooled Roots vacuum pump is suitable for the working conditions which cannot be born by common Roots vacuum pumps such as high temperature, high compression ratio, high pressure difference and the like, such as some electric power and petrochemical industry fields; and thirdly, a wet (water-cooling) Roots vacuum pump is used for directly spraying a small amount of water from an air suction port to cool air, and has a more complex structure and high running noise compared with the conventional Roots vacuum pump, is mainly used in the papermaking and industrial dust removal industries, and has a relatively narrow application range. At present, most manufacturers for producing Roots vacuum pumps at home and abroad mainly produce common Roots vacuum pumps and air-cooled Roots vacuum pumps, and the most manufacturers for producing common Roots vacuum pumps.
The common Roots vacuum pump is a double-rotor positive displacement vacuum pump, wherein two rotors rotate at high speed in opposite directions, the space formed by the two rotors and a pump body is continuously changed to suck and discharge gas, and the rotors are in clearance fit with each other, and the rotors and the pump body are in clearance fit with each other. The heat generated in the compression working process of the Roots vacuum pump can be transferred to the rotor and the pump body, the heat of the rotor is difficult to transfer to the outside, the heat of the pump body is easy to be emitted to the atmosphere, and the difference in temperature can cause the difference in thermal expansion rate, so that the fit clearance is reduced and even is blocked. Therefore, the working load and the pressure difference of the common Roots vacuum pump are limited, and the requirements on the processing precision, the assembly precision and the thermal stability of materials are high, and the difference between the Roots vacuum pump produced in China and the vacuum pump produced by International first-class factories is mainly in the aspect of stability and reliability. The air-cooled Roots vacuum pump is adopted, and although the heat resistance of the Roots vacuum pump can be improved, the air extraction efficiency of the Roots pump can be reduced by the backflow of air, and the effective extraction volume is reduced due to the necessarily increased rotor volume when the backflow port is sealed during rotor extraction, so that the efficiency of the air-cooled Roots vacuum pump is relatively low. Because the characteristics of the two Roots pumps are greatly different, the two Roots pumps can not be basically used interchangeably, and the universality is poor.
Disclosure of Invention
The invention aims to provide a balanced Roots vacuum pump system and a control method, which can automatically adjust the opening of a reflux cooling gas pipeline according to the requirements of actual working conditions, so that the Roots vacuum pump can be used as a common Roots vacuum pump and a gas-cooled Roots pump at the same time, and the system has the advantages of the two Roots pumps, and improves the performance of the Roots vacuum pump as much as possible on the premise of ensuring the reliable operation of the Roots vacuum pump.
In order to achieve the functions, the technical scheme provided by the invention is as follows:
a balanced Roots vacuum pump system comprises a Roots vacuum pump, a condenser, a detection mechanism and a DCS system;
the two sides of the pump body of the Roots vacuum pump are respectively provided with a return port, and the return ports are provided with automatic regulating valves;
the condenser is arranged on the air outlet of the Roots vacuum pump, and the condenser is connected with the reflux port through a pipeline;
The detection mechanism comprises a pressure sensor a, a pressure sensor b and a temperature sensor, wherein the pressure sensor a and the pressure sensor b are respectively arranged on an air inlet pipeline and an exhaust pipeline of the Roots vacuum pump, and the temperature sensor is arranged on the exhaust pipeline of the Roots vacuum pump;
The DCS system comprises an input module, an output module, a storage module and a processor; the input module is electrically connected with the pressure sensor a, the pressure sensor b and the temperature sensor; the input module is used for receiving inlet pressure P I and outlet pressure P 0 of the Roots vacuum pump detected by the pressure sensor a and the pressure sensor b, and the outlet exhaust temperature T 0 of the Roots vacuum pump detected by the temperature sensor and transmitting P I、P0 and T 0 to the processor;
The storage module is electrically connected with the processor and is used for storing preset initial values of P min、Pmax、n、Tmax and duration time T of an abnormal state and various working condition states (P min is the minimum value allowed by the absolute pressure of the inlet of the Roots vacuum pump, P max is the maximum value allowed by the absolute pressure of the inlet of the Roots vacuum pump, n is the compression ratio selected when the Roots vacuum pump is designed and selected, and T max is the maximum value allowed by the exhaust temperature of the Roots vacuum pump);
the processor compares the received P I、P0 and T 0 with preset values in the memory, selects corresponding working conditions and generates control signals;
The output module is electrically connected with the processor and the automatic regulating valve, and the opening of the automatic regulating valve is regulated by the output module according to the control signal.
The invention also provides a control method of the balance type Roots vacuum pump system, which comprises the following steps,
S1, a DCS system reads the numerical values of P I、P0 and T 0;
S2, comparing the received value with a set value by the DCS system to determine which working condition the balanced Roots vacuum pump system is in;
S3, the DCS system sends a signal to the automatic regulating valve according to the working condition state number, and the automatic regulating valve executes corresponding actions;
S4, if the duration that the balanced Roots vacuum pump system is continuously in an abnormal state exceeds a set value t, the DCS system sends out an alarm signal and displays an abnormal state instruction.
Preferably, the automatic regulating valve is slowly varied at an opening of 1% per second when the opening is changed.
Preferably, the operating condition state and the action relation executed by the automatic regulating valve are as follows:
1. When P I＞Pmax、Po≤n×Pmax、To≤Tmax is reached, the automatic regulating valve is fully closed;
2. When P min≤PI≤Pmax、Po≤n×Pmax、To≤Tmax is reached, the automatic regulating valve is not moved;
3. When P I＜Pmin、Po≤n×Pmax、To≤Tmax is reached, the opening of the automatic regulating valve is increased;
4. When P I＞Pmax、Po＞n×Pmax、To≤Tmax is reached, the opening of the automatic regulating valve is reduced;
5. When P min≤PI≤Pmax、Po＞n×Pmax、To≤Tmax is reached, the opening of the automatic regulating valve is increased;
6. when P I＜Pmin、Po＞n×Pmax、To≤Tmax is reached, the opening of the automatic regulating valve is increased;
7. When P I＞Pmax、Po≤n×Pmax、To＞Tmax is reached, the opening of the automatic regulating valve is increased;
8. When P min≤PI≤Pmax、Po≤n×Pmax、To＞Tmax is reached, the opening of the automatic regulating valve is increased;
9. when P I＜Pmin、Po≤n×Pmax、To＞Tmax is reached, the opening of the automatic regulating valve is increased;
10. When P I＞Pmax、Po＞n×Pmax、To＞Tmax is reached, the opening of the automatic regulating valve is increased;
11. When P min≤PI≤Pmax、Po＞n×Pmax、To＞Tmax is reached, the opening of the automatic regulating valve is increased;
12. when P I＜Pmin、Po＞n×Pmax、To＞Tmax is reached, the opening of the automatic regulating valve is increased.
The invention has the beneficial effects that:
1. The balanced Roots vacuum pump system can be used as a common Roots vacuum pump and an air-cooled Roots pump at the same time, and has strong universality and extremely wide application range;
2. the advantages of the two Roots pumps are taken into account, the performances of the Roots pumps can be adjusted according to different working conditions, the maximization of the advantages is realized, the large air quantity can be provided under the condition of needing the large air quantity, and the large pressure difference can be provided under the condition of needing the large pressure difference;
3. the system has a self-diagnosis function, can determine whether the Roots vacuum pump works normally according to the running parameters, can be self-adjusted to avoid overload of the Roots pump, greatly improves the stability and reliability of the Roots pump, and is convenient to use and maintain.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment.
Detailed Description
The invention is further described below with reference to fig. 1:
embodiment one:
The balanced Roots vacuum pump system shown in FIG. 1 comprises a Roots vacuum pump 1, a condenser 7, a detection mechanism and a DCS system 4; the two sides of the pump body of the Roots vacuum pump 1 are respectively provided with a reflux port 11, and the reflux port 11 is provided with an automatic regulating valve 3; the condenser 7 is arranged on the air outlet of the Roots vacuum pump 1, and the condenser 7 is connected with the reflux port 11 through a pipeline 6; the detection mechanism comprises a pressure sensor a2, a pressure sensor b8 and a temperature sensor 5, wherein the pressure sensor a2 and the pressure sensor b8 are respectively arranged on an air inlet pipeline and an air outlet pipeline of the Roots vacuum pump 1, and the temperature sensor 5 is arranged on the air outlet pipeline of the Roots vacuum pump 1.
The DCS system 4 comprises an input module, an output module, a storage module and a processor; the input module is electrically connected with the pressure sensor a2, the pressure sensor b8 and the temperature sensor 5; the input module is used for receiving the inlet pressure P I and the outlet pressure P 0 of the Roots vacuum pump 1 detected by the pressure sensor a2 and the pressure sensor b8, detecting the outlet exhaust temperature T 0 of the Roots vacuum pump 1 by the temperature sensor 5, and transmitting P I、P0 and T 0 to the processor; the storage module is electrically connected with the processor and is used for storing preset initial values of P min、Pmax、n、Tmax and the duration t of the allowable abnormal state and various working condition states, descriptions and actions to be executed by the automatic regulating valve 3. The processor compares the received P I、P0 and T 0 with preset values in the memory, selects corresponding working conditions and generates control signals; the output module is electrically connected with the processor and the automatic regulating valve 3, and the output module controls the automatic regulating valve 3 to be opened or closed according to the control signal.
P min is the minimum allowable value of the absolute pressure at the inlet of the Roots vacuum pump 1, P max is the maximum allowable value of the absolute pressure at the inlet of the Roots vacuum pump 1, n is the compression ratio selected when the Roots vacuum pump 1 is designed and selected, and T max is the maximum allowable value of the exhaust temperature at the outlet of the Roots vacuum pump 1.
The invention also provides a control method of the balanced Roots vacuum pump system. The following are the working condition state numbers, working condition states, descriptions and action relations executed by the automatic regulating valve of the balanced Roots vacuum pump system:
the following is a control method of a balanced Roots vacuum pump system, which comprises the following steps:
S1, reading the numerical values of P I、P0 and T 0 by the DCS system 4;
s2, comparing the received value with a set value by the DCS 4 to determine which working condition the balanced Roots vacuum pump system is in;
S3, the DCS system 4 sends a signal to the automatic regulating valve 3 according to the working condition state number, and the automatic regulating valve 3 executes corresponding actions;
s4, if the duration that the balanced Roots vacuum pump system is continuously in an abnormal state (namely, the state number is not 2) exceeds a set value t, the DCS 4 sends out an alarm signal and displays an abnormal state description.
To avoid too large fluctuation when the automatic regulating valve 3 is regulating, the automatic regulating valve 3 is slowly changed at an opening of 0.5% -2% per second when the automatic regulating valve 3 changes the opening, and in this embodiment, the automatic regulating valve 3 is slowly changed at an opening of 1% per second.
Embodiment two:
In this embodiment, the allowable range of the suction pressure of the vacuum system is 40-60 mbar (a), the compression ratio of the Roots vacuum pump 1 is 3, the limit exhaust temperature is 100 ℃, and the allowable abnormal state duration t=10 minutes, that is, P min＝40mbar,Pmax＝60mbar,n＝3,Tmax =100 ℃.
The above-mentioned predetermined value is first inputted into the DCS system 4, and the present system is controlled by the following steps.
S1, transmitting an inlet pressure P I, an outlet pressure P 0 and an outlet exhaust temperature T o of the Roots vacuum pump 1 into a DCS system 4 by a pressure sensor and a temperature sensor 5;
s2, comparing the received data with a set value by the DCS system 4 to determine which state the balanced Roots vacuum pump system is in, for example, when the Roots vacuum pump 1 is just started, the system state is in a number (1);
S3, the DCS system 4 sends a signal to the automatic regulating valve 3 according to the action corresponding to the state number (1), the automatic regulating valve 3 is fully closed, and at the moment, the air quantity of the Roots vacuum pump 1 is maximum, so that the pressure value required by the system can be quickly reached;
If the state of the system changes, for example, the system becomes a state number (3), the DCS system 4 sends a signal to the automatic regulating valve 3 according to the action corresponding to the state number (3), the automatic regulating valve 3 slowly increases the opening degree, the discharged gas flows back into the pump cavity of the Roots vacuum pump 1 through the pipeline 6 after being cooled by the condenser 7, the effect of cooling the rotor and balancing the pressure is achieved, and the opening degree of the automatic regulating valve 3 is stopped increasing until the system becomes the state number (2);
And S4, if the balanced Roots vacuum pump system is continuously in an abnormal state (namely, the state number is not (2)) and the time length exceeds the set value t=10 minutes, and the normal state can not be recovered after automatic adjustment, the DCS system 4 sends out an alarm signal and displays the abnormal state instruction, and the operator is required to stop the inspection equipment if necessary.
The performance of the balanced Roots vacuum pump system of the application is compared with that of the existing common Roots vacuum pump and the air-cooled Roots vacuum pump as follows:
The common Roots vacuum pump has the advantages that under the condition of the same suction amount, the consumed power is much smaller than that of the air-cooled Roots vacuum pump because no return gas exists; the disadvantage is that heat may be generated and locked when the compression ratio becomes large.
The air-cooled Roots vacuum pump has the advantages that the rotor is cooled by the return air, and the rotor is not easy to be blocked when the compression ratio is large, so the air-cooled Roots vacuum pump can be used for working conditions with large compression ratio; the disadvantage is that the always present return gas causes an increased power loss and a lower mechanical efficiency.
The conventional air-cooled Roots vacuum pump can be used as a common Roots vacuum pump, and the power of the air-cooled Roots pump is obviously increased under the same working condition, so that the air-cooled Roots vacuum pump cannot be replaced. And the conventional roots vacuum pump cannot be used for replacing the air-cooled roots vacuum pump because it cannot be used for a large compression ratio.
The balance type Roots vacuum pump is equivalent to a common Roots vacuum pump if the regulating valve is closed, and is equivalent to a conventional air-cooled Roots vacuum pump if the regulating valve is fully opened. Therefore, the device can be used as a common Roots vacuum pump and an air-cooled Roots vacuum pump. The valve is not closed or fully opened in a middle state, and the opening degree of the valve can be automatically adjusted according to the change of working conditions, so that the self-performance adjustment is realized. Therefore, the balanced Roots vacuum pump system can be used as a common Roots vacuum pump and an air-cooled Roots pump at the same time, and has strong universality and extremely wide application range; meanwhile, the application takes advantages of the common Roots pump and the air-cooled Roots pump into consideration, can adjust the performance of the Roots pump according to different working conditions, realizes maximization of the advantages, can provide large air volume under the condition of needing large air volume, and can provide large pressure difference under the condition of needing large pressure difference.
The detection data show that compared with the conventional air-cooled Roots pump with the same specification, the balanced Roots vacuum pump system can be improved by 20% at maximum, and the maximum compression ratio is 17 times that of the conventional Roots vacuum pump with the same specification.
Claims (2)
1. A control method of a balanced Roots vacuum pump system is characterized in that: the balance type Roots vacuum pump system comprises a Roots vacuum pump, a condenser, a detection mechanism and a DCS system;
the two sides of the pump body of the Roots vacuum pump are respectively provided with a return port, and the return ports are provided with automatic regulating valves;
the condenser is arranged on the air outlet of the Roots vacuum pump, and the condenser is connected with the reflux port through a pipeline;
The detection mechanism comprises a pressure sensor a, a pressure sensor b and a temperature sensor, wherein the pressure sensor a and the pressure sensor b are respectively arranged on an air inlet pipeline and an exhaust pipeline of the Roots vacuum pump, and the temperature sensor is arranged on the exhaust pipeline of the Roots vacuum pump;
The DCS system comprises an input module, an output module, a storage module and a processor; the input module is electrically connected with the pressure sensor a, the pressure sensor b and the temperature sensor; the input module is used for receiving inlet pressure P I and outlet pressure P O of the Roots vacuum pump detected by the pressure sensor a and the pressure sensor b, and the outlet exhaust temperature T O of the Roots vacuum pump detected by the temperature sensor and transmitting P I、PO and T O to the processor;
The storage module is electrically connected with the processor and is used for storing preset initial values of P min、Pmax、n、Ｔmax and duration time T of an abnormal state and various working condition states, P min is a minimum value allowed by absolute pressure of an inlet of the Roots vacuum pump, P max is a maximum value allowed by the absolute pressure of the inlet of the Roots vacuum pump, n is a compression ratio selected when the Roots vacuum pump is designed and selected, and T max is a maximum value allowed by the exhaust temperature of the Roots vacuum pump;
The processor compares the received P I、PO and T O with preset values in the memory, selects corresponding working conditions and generates control signals;
The output module is electrically connected with the processor and the automatic regulating valve, and the opening of the automatic regulating valve is regulated by the output module according to the control signal;
The control method of the balance type Roots vacuum pump system comprises the following steps,
S1, a DCS system reads the numerical values of P I、PO and T O;
S2, comparing the received value with a set value by the DCS system to determine which working condition the balanced Roots vacuum pump system is in;
S3, the DCS system sends a signal to the automatic regulating valve according to the working condition state number, and the automatic regulating valve executes corresponding actions;
s4, if the duration that the balanced Roots vacuum pump system is continuously in an abnormal state exceeds a set value t, the DCS system sends out an alarm signal and displays an abnormal state description;
the working condition states and the action relationships executed by the automatic regulating valve are as follows:
1. When P I>Pmax、PＯ≤n×Pmax 、ＴＯ≤Ｔmax is reached, the automatic regulating valve is fully closed;
2. when P min≤PI≤Pmax、PＯ≤n×Pmax、ＴＯ≤Ｔmax is reached, the automatic regulating valve is not moved;
3. when P I<Pmin、PＯ≤n×Pmax、ＴＯ≤Ｔmax is reached, the opening of the automatic regulating valve is increased;
4. when P I>Pmax、PＯ>n×Pmax 、ＴＯ≤Ｔmax is reached, the opening of the automatic regulating valve is reduced;
5. when P min≤PI≤Pmax、PＯ>n×Pmax、ＴＯ≤Ｔmax is reached, the opening of the automatic regulating valve is increased;
6. when P I<Pmin、PＯ>n×Pmax、ＴＯ≤Ｔmax is reached, the opening of the automatic regulating valve is increased;
7. when P I>Pmax、PＯ≤n×Pmax 、ＴＯ>Ｔmax is reached, the opening of the automatic regulating valve is increased;
8. When P min≤PI≤Pmax、PＯ≤n×Pmax、ＴＯ>Ｔmax is reached, the opening of the automatic regulating valve is increased;
9. When P I<Pmin、PＯ≤n×Pmax、ＴＯ>Ｔmax is reached, the opening of the automatic regulating valve is increased;
10. When P I>Pmax、PＯ>n×Pmax 、ＴＯ>Ｔmax is reached, the opening of the automatic regulating valve is increased;
11. when P min≤PI≤Pmax、PＯ>n×Pmax、ＴＯ>Ｔmax is reached, the opening of the automatic regulating valve is increased;
12. when P I<Pmin、PＯ>n×Pmax、ＴＯ>Ｔmax is reached, the opening of the automatic regulating valve is increased.
2. The control method of the balanced roots vacuum pump system according to claim 1, wherein: the opening of the automatic regulating valve is slowly changed according to the opening of 0.5% -2% per second.
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