CN107975477A - An automatic control method and system for a diesel engine-driven ultra-large flow vacuum pump - Google Patents

Abstract

The invention discloses an automatic control method and system for a diesel engine-driven ultra-large flow vacuum pump. The upper computer of the control system of the control method is an industrial computer, the lower computer adopts a distributed architecture of DP bus, and the main controller is Siemens PLC300 to coordinate the sub-controllers. Action, the sub-controller is Siemens PLC200 to control the action of a single diesel engine water ring pump unit. The control objects include 8 diesel engine water ring pump units, and the automatic start, operation and stop of any or all of the 8 diesel engine water ring pump units can be controlled arbitrarily according to the demand, which greatly reduces the need for personnel and makes the system Running costs are reduced. The automatic control system of the present invention adopts a distributed architecture based on DP bus, each sub-system operates independently, controls the action of a single diesel engine water ring pump, collects corresponding sensor information, and accepts the coordinated action of the top-level general controller at the same time to ensure the orderly progress of the automatic control process .

Description

An automatic control method and system for a diesel engine-driven ultra-large flow vacuum pump

technical field

The invention relates to an automatic control method and system for a super-large-flow vacuum pump driven by a diesel engine, and belongs to the technical field of wind tunnel exhaust.

Background technique

Gas flow wind tunnels are used for thermal testing of reentry vehicles such as rockets and spaceships. In order to simulate a high vacuum environment, the wind tunnel generally works under negative pressure. At this time, the wind tunnel exhaust system will maintain this negative pressure by exhausting the working gas of the wind tunnel. The exhaust system plays a key role in maintaining the conditions in the wind tunnel.

The XX gas flow wind tunnel requires a working time of 1000s, which belongs to the continuous gas flow wind tunnel. Its exhaust system adopts the continuous exhaustion scheme of mechanical vacuum pump. The single vacuum pump used has a displacement of 54000m3/h, a power of 1.2MW, and 8 sets. Because the total power is too large, the local power supply cannot meet the demand, and a marine medium-speed diesel engine is used as the power of the vacuum pump.

Each vacuum pump unit consists of a diesel engine, a gearbox and a water ring vacuum pump. Compared with motor-driven vacuum pumps, the operation of vacuum pump units driven by diesel engines is far more complicated. The diesel engine itself involves complex operations such as starting, warming up, stopping, and speed up and down, plus the clutch closing/opening of the gearbox, water supply, air extraction and other valve operations of the water ring vacuum pump, so that more than 20 operating steps are required for one unit to work. step. If manual operation is adopted, the operation complexity of 8 units operating at the same time is unacceptable, and automatic control must be adopted.

Contents of the invention

The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, to provide an automatic control method and system for a diesel engine-driven super-large-flow vacuum pump, and to use the diesel-engine-driven super-large-flow vacuum pump automatic control method to realize the operation of a large-flow vacuum pump driven by a diesel engine as a power source And the whole process automation of the operation of the internal combustion power mechanical vacuum pump unit.

The technical solution solved by the present invention is: an automatic control method of a diesel engine-driven ultra-large flow vacuum pump, the steps are as follows:

(1) According to the demand, the industrial computer configures the working quantity of the diesel engine water ring pump unit, and sends the configured working quantity to the main controller PLC, and the main controller PLC downloads to the sub-controller corresponding to the diesel engine water ring pump unit that needs to work issue a start command;

(2) The sub-controller that received the start command runs, starts the lubricating oil pump and runs for a period of time to ensure that all parts of the diesel engine are fully lubricated;

(3) Open the external circulating water inlet solenoid valve of the diesel engine;

(4) Start the diesel engine. When the diesel engine speed reaches the first interval speed, the diesel engine is started. After the diesel engine runs stably for a period of time, the speed will rise to the first speed, and the diesel engine will be warmed up;

(5) When the oil temperature of the diesel engine and the water temperature of the internal circulating water rise to t1 temperature, the gear box has the condition for combined discharge, and the speed of the diesel engine is increased to the speed of the second interval, and the gear box is combined;

(6) After the gear box is assembled, raise the speed of the diesel engine to the third interval speed, and continue to warm up the car; when the temperature of the diesel oil in the diesel engine and the temperature of the internal circulating water reach the temperature t2, the warm-up of the diesel engine water ring pump unit is over;

(7) Raise the speed to the fourth interval speed, and the diesel engine water ring pump unit is started;

(8) The diesel engine water ring pump unit is vacuumed. After the vacuuming is completed, the main controller sends a shutdown command to the sub-controller;

(9) After the sub-controller receives the shutdown command, the diesel engine slows down to the fifth interval speed, and after running for a period of time, proceed to step (10);

(10) After the speed of the diesel engine drops to the sixth interval, the gearbox is disengaged;

(11) Diesel engine diesel temperature and internal circulating water temperature drop below t3, reduce the diesel engine speed to zero, and the diesel engine shutdown process ends.

The CPU model of the main controller PLC in the automatic control system is 6ES7 315-2AG10-0AB0, which supports DP master station or DP slave station, and the instruction running speed is 0.1ms/1000 instructions.

The CPU model of the sub-controller PLC in the automatic control system is 224xP, which contains two RS-485 communications, and can expand up to 7 modules. The extended communication module is EM77, which is used to connect to the DP field bus.

The value range of t1 in the automatic control process is 37 degrees Celsius to 43 degrees Celsius. This is the diesel temperature and internal circulating water temperature required for the diesel engine to reach the rated speed after the speed reaches 500 rpm.

The value range of t2 in the automatic control process is 58 degrees Celsius to 62 degrees Celsius. This is the temperature that the diesel oil temperature and internal circulating water temperature need to reach before the diesel engine water ring pump unit runs with load.

The value range of t3 is below 59 degrees Celsius.

The marine medium-speed diesel engine is used as the power of the vacuum pump to drive the mechanical vacuum pump to exhaust. It overcomes the difficulty that the local power supply cannot meet the demand due to the excessive total power. Among them, the vacuum pump (that is, the diesel engine water ring pump) has a displacement of 54000m3/h and a rated power of 1.2MW;

The rated speed of the diesel engine is 1000 rpm, and the rated power is 1.44MW; the first range of speed is 200 rpm to 250 rpm; the first range of speed is 450 rpm; the second range of speed is 490 rpm to 510 rev/min; the speed of the third interval is 890 rev/min~910 rev/min; the speed of the fourth interval is 990 rev/min~1010 rev/min; the speed of the fifth interval is 500 rev/min~510 rev/min; The rotating speed in the six intervals is 440 rpm to 450 rpm.

The automatic control system adopts a distributed architecture based on DP bus. Each sub-system operates independently, controls the action of a single diesel engine water ring pump, collects corresponding sensor information, and accepts the coordinated action of the top-level master controller to ensure the orderly progress of the automatic control process.

The closed-loop control system composed of the sub-controller PLC200 and the speed sensor realizes the speed regulation and stable speed of the diesel engine. The branch controller PLC200 compares the target speed with the actual speed fed back by the speed sensor after setting the target speed, and then controls the diesel engine to speed up, slow down and maintain this speed through instructions according to the results, so as to realize the speed of the diesel engine and realize the automatic control of the speed of the diesel engine. control.

An automatic control system for a diesel engine-driven ultra-large-flow vacuum pump, including: an industrial computer, a main controller PLC, and a sub-controller;

The industrial computer configures the working quantity of the diesel engine water ring pump unit according to the demand, and sends the configured working quantity to the main controller PLC, and the main controller PLC sends a start command to the sub-controller corresponding to the diesel engine water ring pump unit that needs to work;

The sub-controller that receives the start command runs, and the sub-controller starts the lubricating oil pump and runs for a period of time to ensure that all parts of the diesel engine are fully lubricated;

The sub-controller opens the external circulating water inlet solenoid valve of the diesel engine;

The sub-controller starts the diesel engine. When the diesel engine speed reaches the first interval speed, the diesel engine is started. After the diesel engine runs stably for a period of time, the speed rises to the first speed, and the diesel engine starts to warm up;

When the oil temperature of the diesel engine and the temperature of the internal circulating water rise to t1 temperature, the gear box has the condition for combined discharge, and the sub-controller increases the speed of the diesel engine to the second interval speed, and the gear box is combined;

After the gear box is combined, the sub-controller increases the speed of the diesel engine to the third range, and continues to warm up the car; when the temperature of the diesel in the diesel engine and the temperature of the internal circulating water reach the temperature t2, the warm-up of the diesel water ring pump unit ends;

The sub-controller increases the speed to the fourth interval speed, and the diesel water ring pump unit starts up;

The sub-controller controls the diesel engine water ring pump unit to vacuumize. After the vacuuming is completed, the main controller sends a shutdown command to the sub-controller;

After the sub-controller receives the stop command, the diesel engine slows down to the fifth interval speed. After running for a period of time, the sub-controller controls the diesel engine speed to drop to the sixth interval speed, and the gearbox is released; the sub-controller controls the diesel engine diesel temperature and The temperature of the internal circulating water drops below t3, the speed of the diesel engine is reduced to zero, and the diesel engine stops.

The advantage of the present invention compared with prior art is:

(1) The present invention realizes exhaustion by using a marine medium-speed diesel engine as the power-driven mechanical vacuum pump of the vacuum pump. The single vacuum pump used has a displacement of 54000m3/h, a power of 1.2MW, and 8 sets. It overcomes the difficulty that the local power supply cannot meet the demand due to the excessive total power.

(2) The present invention realizes for the first time the automatic pneumatic operation, automatic warm-up, automatic clutch engagement, automatic supply of external circulation cooling water, automatic speed increase, automatic load loading, automatic intervention in vacuum pumping, and automatic stop of vacuum pumping for diesel engine-driven water ring vacuum pump units. , Automatic deceleration, automatic clutch separation, automatic cooling, automatic shutdown, etc. The whole process of unit operation is automated. The operator only needs to click the two buttons of start and stop to realize the automatic operation of the unit.

(3) The automatic control technology of the whole working process of the diesel engine vacuum pump equipment combination of the present invention is very innovative. The automatic control system adopts a distributed architecture based on DP bus, and each subsystem operates independently to control the action of a single diesel water ring pump and collect corresponding sensors. information, and at the same time accept the coordinated actions of the top-level general controller to ensure the orderly progress of the automatic control process.

(4) The present invention is very innovative based on the automatic control technology of the speed of the mechanical speed diesel engine. The speed of the diesel engine is the key control quantity of the automatic control process and also an important symbol of the automatic control process. Therefore, the speed control of the diesel engine is very important. This paper In the invention, the PLC200 is used to control the rotational speed of the mechanical diesel engine to meet the control requirements.

(5) The automatic control method of the diesel engine-driven ultra-large flow vacuum pump of the present invention enables 8 sets of diesel engine water ring pump units to realize the automatic operation of several or all of the units by clicking the two buttons of start and stop, which greatly reduces The demand for personnel reduces the operating cost of the system.

Description of drawings

Fig. 1 is a structural principle diagram of the automatic control system of a diesel engine-driven ultra-large flow vacuum pump in the present invention.

Fig. 2 is a flowchart of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a diesel engine-driven ultra-large flow vacuum pump automatic control method and system of the present invention, the upper computer of the control system of the control method is Advantech industrial computer, the lower computer adopts the distributed architecture of DP bus, and the main controller is Siemens PLC300 coordinates the action of each sub-controller, and the sub-controller is Siemens PLC200 to control the action of a single diesel engine water ring pump unit. The control objects include 8 diesel engine water ring pump units, and the automatic start, operation and stop of any or all of the 8 diesel engine water ring pump units can be controlled arbitrarily according to the needs, which greatly reduces the need for personnel and makes the system Running costs are reduced. The automatic control system of the present invention adopts a distributed architecture based on DP bus, and each sub-system operates independently, controls the action of a single diesel engine water ring pump, collects corresponding sensor information, and accepts the coordinated action of the top-level general controller at the same time to ensure the orderly progress of the automatic control process .

As shown in Figure 1, the diesel engine-driven super-large flow vacuum pump automatic control system of the present invention includes: an industrial computer, a main controller PLC300, 8 sub-controllers PLC200, and 8 diesel engine controllers. The functions of each part are as follows:

(1) Industrial computer: it is used to run the upper computer software in the control room to realize human-computer interaction, read and display the key parameters of the diesel engine (including diesel engine oil pressure, diesel engine cooling water pressure, diesel engine oil temperature, diesel engine cooling) through the TCP/IP protocol water temperature, diesel engine speed, etc.) and the working process of the diesel water ring vacuum pump unit; configure the working conditions of the diesel engine water ring vacuum pump unit according to different needs (according to the requirements of the pumping volume and whether the diesel engine itself can work normally, it may be selected in a test Any number of the 8 diesel engines are running, so the automatic control process will be different for each test), and the configuration information will be sent to the main controller PLC.

(2) The main controller PLC is used in the control room to coordinate the orderly operation of each sub-controller PLC200, and conduct information interaction with the industrial computer through Ethernet, and upload the key parameters of the industrial computer diesel engine and the working process of the diesel water ring vacuum pump unit;

At the same time, the main controller PLC receives the configuration information issued by the industrial computer; through the Ethernet through the DP bus, it exchanges information with each sub-controller PLC200, receives the working information of each sub-controller PLC200 collected by the sub-controller PLC200, and sends it to each sub-controller. The sub-controller PLC200 issues control commands to control the opening and closing of the control water valve and the flow rate at the inlet of the diesel engine water ring pump unit through the main controller PLC.

The inlet of the diesel engine water ring pump unit is connected to the water source through a pipeline. There is a water flow control valve on the pipeline to control the flow of the pipeline; there is also a solenoid valve to control the opening and closing of the pipeline; the water flow control valve;

(3) Sub-controller PLC200: used to receive the start-stop command from the main controller next to the diesel engine, control the work of the diesel engine, gearbox and water ring vacuum pump according to the pre-set process in the sub-controller, and communicate the working process and the key points of the diesel engine in real time The parameters are uploaded to the main controller; the sub-controller PLC200 reads the parameter information of the diesel engine uploaded by the diesel engine controller through the MODBUS bus; the sub-controller PLC200 collects the gearbox working information (gearbox temperature, gear speed, etc. box parameter).

(4) Diesel engine controller: used to read the key parameters collected by the sensors on the diesel engine (diesel engine related parameters such as diesel pressure, diesel temperature, and internal circulating water temperature) and upload them to each sub-controller.

The control object of the diesel engine-driven ultra-large flow vacuum pump automatic control system is: diesel engine water ring vacuum pump unit, including: diesel engine, gearbox and water ring vacuum pump. The diesel engine outputs power to the gearbox, and the gear box works to drive the water ring vacuum pump. Vacuum the confined space.

Diesel engine, including lubricating oil pump, after the lubricating oil pump works, it can pump lubricating oil into various parts of the diesel engine to achieve lubrication;

As shown in Figure 2, the automatic control method of a diesel engine-driven ultra-large flow vacuum pump, the steps are as follows:

1) According to the demand, the industrial computer configures the working quantity of the diesel engine water ring pump unit, and sends the configured working quantity to the main controller PLC, and the main controller PLC sends it to the sub-controller corresponding to the diesel engine water ring pump unit that needs to work start command;

2) After receiving the starting instruction, the sub-controller runs, starts the lubricating oil pump and runs for a period of time to ensure that all parts of the diesel engine are fully lubricated.

3) Open the external circulating water inlet solenoid valve of the diesel engine;

4) Start the diesel engine. When the speed of the diesel engine reaches between 200 rpm and 250 rpm, the diesel engine is started. After the diesel engine runs stably for a period of time, the speed rises to 450 rpm, and the diesel engine starts to warm up (warming means The diesel engine rises from low speed to rated speed and has the process of working with load).

5) When the oil temperature of the diesel engine and the temperature of the internal circulating water rise to t1 temperature, the gear box has the condition of combined displacement (combined displacement means that the diesel engine drives the vacuum pump to run through the action of the gear box), and the diesel engine speed is raised to 490 rpm to 510 rpm /min, the gear box is combined;

6) After the gearbox is assembled, increase the diesel engine speed to 890-910 rpm, and continue to warm up the car. When the temperature of the diesel oil in the diesel engine and the temperature of the internal circulating water reach the temperature t2, the warm-up of the water ring pump unit of the diesel engine ends.

7) Increase the speed to 990 rpm to 1010 rpm, and the diesel engine water ring pump unit is started.

8) After the vacuum pumping of the diesel engine water ring pump unit is completed, the main controller sends a shutdown command to the sub-controller,

9) After the sub-controller receives the shutdown command, the diesel engine slows down to 500 rpm to 510 rpm, and after running for a period of time, proceed to step 10.

10) After the speed of the diesel engine drops to 440 to 450 rpm, the gearbox comes off. (Exhaust removal means that the diesel oil no longer drives the water ring pump to work through the action of the gearbox)

11) Diesel engine diesel temperature and internal circulating water temperature drop below 59 degrees, reduce the diesel engine speed to 0, and the diesel engine shutdown process ends.

After the diesel engine water ring pump unit is started, it has the ability to pump vacuum. It can wait for the external system to trigger the command to intervene in vacuum pumping and stop vacuum pumping, and automatically enter the corresponding working steps.

In step 1, determine the lubricating oil pump formula as: t=KV/F

Among them, t is the running time of the lubricating oil pump; K is the proportional coefficient (take 1.5); V is the volume that needs to be lubricated, the unit is m ³ ; F is the flow rate of the pump, the unit is m ³ /min.

The starting process of the diesel engine water ring pump unit is as follows: 1. The diesel engine starts and runs stably; 2. Wait for the diesel engine to meet the conditions for rising from low speed to high speed (and the diesel engine oil temperature and internal circulating water temperature both reach the temperature t1) 3. The diesel engine and the water ring pump 4. The diesel engine drives the water ring pump to increase the speed to the rated speed of 1000 rpm; 5. Wait for the trigger to start vacuuming. The design of the start-up process steps of the automatic control method of the super-large flow vacuum pump driven by a diesel engine is derived from this.

The shutdown process of the diesel engine water ring pump unit is as follows: 1. The diesel engine is reduced from the rated speed to a low speed; 2. The diesel engine is separated from the water ring pump; 3. After the diesel engine oil temperature and the external circulating water temperature drop below 59 degrees, the diesel engine speed is reduced to 0; 4. The shutdown of the diesel engine water ring pump unit is over. The design of the shutdown process steps of the automatic control method of the diesel engine-driven ultra-large flow vacuum pump is derived from this.

The value range of t1 in the automatic control process is 37 degrees Celsius to 43 degrees Celsius. This is the diesel temperature and internal circulating water temperature required for the diesel engine to reach the rated speed after the engine speed reaches 500 rpm; the value range of t2 is 58 degrees Celsius to 62 degrees Celsius. This is the temperature that the diesel oil temperature and internal circulating water temperature need to reach before the diesel engine water ring pump unit runs with load.

Diesel engine-driven super-large-flow vacuum pump automatic control method uses a marine medium-speed diesel engine as the power of the vacuum pump to drive a mechanical vacuum pump to exhaust. It overcomes the difficulty that the local power supply cannot meet the demand due to the excessive total power. Among them, the index of the vacuum pump is 54000m3/h, the rated power is 1.2MW; the rated speed of the diesel engine is 1000 rpm, and the rated power is 1.44MW.

The automatic control system adopts a distributed architecture based on DP bus. Each sub-system operates independently, controls the action of a single diesel engine water ring pump, collects corresponding sensor information, and accepts the coordinated action of the top-level master controller to ensure the orderly progress of the automatic control process. Among them, the CPU model of the main controller PLC is 315, supports DP master station or DP slave station, and the instruction running speed is 0.1ms/1000 instructions. The CPU model of the sub-controller PLC in the automatic control system is 224xP, which contains two RS-485 communications, and can expand up to 7 modules. The extended communication module is EM77, which is used to connect to the DP field bus.

In this control method, the diesel engine is controlled by a closed-loop control system composed of a sub-controller PLC200 and a speed sensor to realize speed regulation and stable speed. The branch controller PLC200 compares the target speed with the actual speed fed back by the speed sensor after setting the target speed, and then controls the diesel engine to speed up, slow down and maintain this speed through instructions according to the results, so as to realize the speed of the diesel engine and realize the automatic control of the speed of the diesel engine. control.

An automatic control system for a diesel engine-driven ultra-large flow vacuum pump of the present invention includes: an industrial computer, a main controller PLC, and a sub-controller;

The industrial computer configures the working quantity of the diesel engine water ring pump unit according to the demand, and sends the configured working quantity to the main controller PLC, and the main controller PLC sends a start command to the sub-controller corresponding to the diesel engine water ring pump unit that needs to work;

The sub-controller that receives the start command runs, and the sub-controller starts the lubricating oil pump and runs for a period of time to ensure that all parts of the diesel engine are fully lubricated;

The sub-controller opens the external circulating water inlet solenoid valve of the diesel engine;

The sub-controller starts the diesel engine. When the diesel engine speed reaches 200 rpm to 250 rpm, the diesel engine is started. After the diesel engine runs stably for a period of time, the speed rises to 450 rpm, and the diesel engine starts to warm up;

When the oil temperature of the diesel engine and the temperature of the internal circulating water rise to t1 temperature, the gear box is ready for combined discharge, and the sub-controller increases the speed of the diesel engine to 490 rpm to 510 rpm, and the gear box is combined;

After the gear box is assembled, the sub-controller raises the diesel engine speed to 890 rpm to 910 rpm, and continues to warm up the car. When the diesel temperature in the diesel engine and the temperature of the internal circulating water reach the temperature t2, the warm-up of the diesel engine water ring pump unit ends;

The sub-controller increases the speed to 990 rpm to 1010 rpm, and the diesel engine water ring pump unit is started;

The sub-controller controls the diesel engine water ring pump unit to vacuumize. After the vacuuming is completed, the main controller sends a shutdown command to the sub-controller;

After the sub-controller receives the shutdown command, the diesel engine slows down to 500 rpm to 510 rpm. After running for a period of time, the sub-controller controls the diesel engine speed to drop to 440 rpm to 450 rpm. Row; the sub-controller controls the temperature of the diesel engine and the temperature of the internal circulating water to drop below t3, reduces the speed of the diesel engine to 0, and stops the diesel engine.

The invention realizes the exhaustion of the mechanical vacuum pump driven by the marine medium-speed diesel engine as the power of the vacuum pump. The single vacuum pump used has a displacement of 54000m3/h, a power of 1.2MW, and 8 sets. It overcomes the difficulty that the local power supply cannot meet the demand due to the excessive total power.

The invention realizes for the first time the automatic pneumatic operation, automatic warm-up, automatic clutch closing, automatic supply of external circulation cooling water, automatic speed up, automatic loading, automatic intervention in vacuum pumping, automatic stop of vacuum pumping, and automatic lowering of the water ring vacuum pump unit driven by a diesel engine. Automatic speed, automatic separation clutch, automatic cooling, automatic shutdown, etc. The whole process of unit operation is automated. The operator only needs to click the two buttons of start and stop to realize the automatic operation of the unit. Moreover, the automatic control technology of the entire working process of the diesel engine vacuum pump equipment combination in the present invention is very innovative. The automatic control system adopts a distributed architecture based on DP bus, and each subsystem operates independently to control the action of a single diesel water ring pump and collect corresponding sensor information. , and at the same time accept the coordinated actions of the top-level general controller to ensure the orderly progress of the automatic control process.

The present invention is very innovative based on the automatic control technology of the speed of the mechanical speed diesel engine. The speed of the diesel engine is a key control quantity of the automatic control process and an important symbol of the automatic control process. The PLC200 controls the speed of the mechanical diesel engine to meet the control requirements, and the automatic control method of the diesel engine-driven ultra-large flow vacuum pump of the present invention enables 8 sets of diesel engine water ring pump units to realize several or all of them by clicking the two buttons of start and stop. The automatic operation of the unit greatly reduces the need for personnel and reduces the operating cost of the system.

The effect of the present invention is remarkable, and the realization of the automatic control method of the super-large-flow vacuum pump driven by the diesel engine of the present invention greatly reduces the personnel requirement (the personnel requirement is reduced from the original 8 to 3), so that the operating cost of the system is reduced, and the equipment can be operated The cumbersome process is solidified into the controller. During the operation of the diesel engine water ring pump unit, the operator only needs to click the two buttons of start and stop, which greatly reduces the equipment operation failure caused by human factors.

Claims (10)

1. a kind of Diesel Driven super-flow vacuum pump autocontrol method, it is characterised in that step is as follows：

(1) according to demand, diesel engine water ring pump assembly working quantity is configured by industrial personal computer, and the working quantity of configuration is sent to Master controller PLC, master controller PLC refer to needing the corresponding sub-controller of diesel engine water ring pump assembly of work to issue startup Order；

(2) the sub-controller operation of enabled instruction is connected to, starts grease pump and runs a period of time, ensure each portion in diesel engine Position sufficient lubrication；

(3) the outer circulation water entering water electromagnetic valve of diesel engine is opened；

(4) diesel engine is started, when diesel engine speed reaches first interval rotating speed, diesel engine starting finishes, diesel engine stable operation Rotating speed is risen into the first rotating speed after a period of time, starts to carry out warming up to diesel engine；

(5) when the water temperature of the gentle interior recirculated water of diesel engine oil is raised to t1 temperature, gear-box, which possesses, closes row's condition, and diesel engine is turned Speed rises to second interval rotating speed, and gear-box closes row；

(6) diesel engine speed is risen into 3rd interval rotating speed after gear-box conjunction row, continues warming up；When the diesel fuel temperature in diesel engine When reaching t2 temperature with interior circulating water temperature, diesel engine water ring pump assembly warming up terminates；

(7) rotating speed is risen into the 4th section rotating speed, diesel engine water ring pump assembly start completion；

(8) diesel engine water ring pump assembly vacuumizes, and after vacuumizing, master controller sends halt instruction to sub-controller；

(9) after sub-controller receives halt instruction, diesel engine reduction of speed to the 5th section rotating speed, after running a period of time, is walked Suddenly (10)；

(10) after diesel engine speed is down to the 6th section rotating speed, gear-box off the row；

(11) diesel oil of diesel engine temperature and interior circulating water temperature are down to below t3, diesel engine speed are reduced to zero, diesel engine stop Flow terminates.

A kind of 2. Diesel Driven super-flow vacuum pump autocontrol method according to claim 1, it is characterised in that： The CPU model 6ES7 315-2AG10-0AB0 of master controller PLC in step (1), support DP main websites or DP slave stations, instruction fortune Scanning frequency degree instructs for 0.1ms/1000 bars.

A kind of 3. Diesel Driven super-flow vacuum pump autocontrol method according to claim 1, it is characterised in that： The CPU model 224xP of sub-controller PLC in step (1), communicate containing two RS-485, and most expansible 7 modules, it expands The communication module of exhibition is EM77, for connecting DP fieldbus.

A kind of 4. Diesel Driven super-flow vacuum pump autocontrol method according to claim 1, it is characterised in that： The value range of t1 is 37 degrees Celsius~43 degrees Celsius in step (5), is that volume is arrived in lifting after diesel engine speed reaches 500 turns/min Determine the diesel fuel temperature of rotating speed requirement and interior circulating water temperature；The value range of t3 is less than 59 degrees Celsius.

5. a kind of Diesel Driven super-flow vacuum pump autocontrol method according to claims 1, its feature exist In：The value range of t2 is 58 degrees Celsius~62 degrees Celsius in step (6), for bavin before the operation of diesel engine water ring pump assembly bringing onto load Oil temperature and interior recirculated water water temperature need the temperature reached.

A kind of 6. Diesel Driven super-flow vacuum pump autocontrol method according to claim 1, it is characterised in that： Using Marine Medium-speed Diesel Engine as vacuum pump, that is, the power drive machinery formula vacuum pump exhaust of diesel engine water ring pump assembly.

7. a kind of Diesel Driven super-flow vacuum pump autocontrol method according to claims 1, its feature exist In：Vacuum pump, that is, diesel engine water ring pump assembly index reaches 54000m3/h for discharge capacity, and rated power reaches 1.2MW.

A kind of 8. Diesel Driven super-flow vacuum pump autocontrol method according to claim 1, it is characterised in that： Diesel engine index 1000 turns/min of rated speed, rated power reach 1.44MW；First interval rotating speed is 200 revs/min~250 Rev/min；First rotating speed is 450 revs/min；Second interval rotating speed is 490 revs/min~510 revs/min；3rd interval turns Speed is 890 revs/min~910 revs/min；4th section rotating speed is 990 revs/min~1010 revs/min；5th section rotating speed For 500 revs/min~510 revs/min；6th section rotating speed is 440 revs/min~450 revs/min.

A kind of 9. Diesel Driven super-flow vacuum pump autocontrol method according to claim 1, it is characterised in that：Bavin Oil machine realizes speed governing and stabilized speed, sub-controller PLC by the closed-loop control system that sub-controller PLC and speed probe are formed Compared with the actual speed of speed probe feedback, then controlled after having set rotating speed of target according to result by instructing Diesel engine raising speed, reduction of speed and this speed is maintained, controlled so as to fulfill the rotating speed of diesel engine, realize the automatic control of diesel engine speed System.

A kind of 10. Diesel Driven super-flow vacuum pump automatic control system, it is characterised in that including：Industrial personal computer, main control Device PLC, sub-controller；

Industrial personal computer configures diesel engine water ring pump assembly working quantity according to demand, and the working quantity of configuration is sent to main control Device PLC, master controller PLC issue enabled instruction to needing the corresponding sub-controller of diesel engine water ring pump assembly of work；

The sub-controller operation of enabled instruction is connected to, sub-controller starts grease pump and runs a period of time, ensures diesel engine Interior each position sufficient lubrication；

Sub-controller opens the outer circulation water entering water electromagnetic valve of diesel engine；

Sub-controller starts diesel engine, and when diesel engine speed reaches first interval rotating speed, diesel engine starting finishes, and diesel engine is stablized Rotating speed is risen into the first rotating speed after operation a period of time, starts to carry out warming up to diesel engine；

When gently interior recirculated water water temperature is raised to t1 temperature to diesel engine oil, gear-box, which possesses, closes row's condition, and sub-controller is by diesel oil Machine rotating speed rises to second interval rotating speed, and gear-box closes row；

Diesel engine speed is risen to 3rd interval rotating speed by sub-controller after gear-box closes row, continues warming up；When the bavin in diesel engine When oil temperature and interior circulating water temperature reach t2 temperature, diesel engine water ring pump assembly warming up terminates；

Rotating speed is risen to the 4th section rotating speed, diesel engine water ring pump assembly start completion by sub-controller；

Sub-controller control diesel engine water ring pump assembly vacuumizes, and after vacuumizing, master controller is sent to sub-controller to stop Machine instructs；

After sub-controller receives halt instruction, diesel engine reduction of speed to the 5th section rotating speed, after running a period of time, sub-controller control After diesel engine speed processed is down to the 6th section rotating speed, gear-box off the row；Sub-controller controls diesel oil of diesel engine temperature and interior circulation Coolant-temperature gage is down to below t3, diesel engine speed is reduced to zero, diesel engine stop.