JPS6053633A - Control method for water pump device driven by engine - Google Patents

Abstract

PURPOSE:To automatically keep water pressure constant by controlling the number of engine revolutions or the number of engines to permit load side pressure of a water pump to fall within a prescribed range and controlling the interruption of abnormal instruments and the operations of normal instruments when an abnormal situation occurs. CONSTITUTION:The number of revolutions of engines 1, 2 are controlled together with control of the number of the engines 1, 2 by detecting pressure of water pumps 3, 4 on the load side such that even if resistance on the load side is changed, the pressure on the load side is always constant or falls in a prescribed range. Namely, with a starter turned on to start a gas engine 1, water pressure is increased after warming the engine. For example, the engine is operated at revolutions of 1,660-1,880rpm in case of the water pressure from 6.4-6.6kg/ cm<2>, and at constant 1,660rpm over 6.6kg/cm<2>. In addition, the engine is stopped at revolutions of, e.g., more than 7kg/cm<2>. Moreover, in case of engine revolu- tions of 1,800rpm and pressure less than 6.4kg/cm<2>, the gas engine 2 is also started. When the engines 1, 2 and the water pumps 3, 4 become abnormal, interruption of abnormal instruments and operations of normal instruments are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling an engine-driven water pump device.

Conventionally, engine-driven water pumps drive the water pump at a constant rotation and adjust the water flow rate by operating a valve, or the operator manually adjusts the engine rotation while checking the flow rate or water pressure to adjust the water pressure. was controlled so that it remained constant.

The purpose of the present invention is to reduce the pressure on the load side of the water pump (
The system detects the water pump discharge pressure) and controls the engine rotation so that the pressure on the load side is always constant or within a certain range even if the resistance on the load side increases or decreases, and also controls the number of engines. When an abnormality occurs in the pump, the stopping of abnormal equipment and the operation of normal equipment are controlled,
Conventional water pump k flA 'Mh at constant engine rotation
To eliminate the trouble of having an L operator open and close a pulp to keep the water pressure constant and manually control the rotation of the engine to keep the water pressure constant.

Hereinafter, the present invention will be explained with reference to all the drawings.

Figure 1 shows a gas engine driven water pump device.

In Figure 1, 1.2 are the first and second gas engines, 3
, 4-digit 11th water pump, 5, 6f′i 1st
, a second heat exchanger, 7 and 8 are first and second exhaust gas heat exchangers, and 9 is an absorption refrigerator.

The output IllK of the first gas engine 1 is connected to the input side of the first water pump 3, and the exhaust system of the first gas engine 1 is provided with a first exhaust gas heat exchanger 7. Further, a first heat exchanger 5 is provided in the cooling circuit of the first gas engine 1, and a cooling water circuit 10 for a charge air cooler and an aftercooler circuit 11 are provided in the first gas engine 1. be.

A pump 12 whose suction side is connected to the outlet side of the absorption refrigerator 9
The discharge side of is connected to the low temperature side of the first heat exchanger 5 via the first pipe 12', and the high temperature side of the first heat exchanger 5 is connected to the first heat exchanger 5 via the second pipe 13. The high temperature side of the first exhaust gas heat exchanger 7 is connected to the inlet side of the absorption refrigerator 9 via the third pipe line 14.

The input side of the second water pump 4 is connected to the output side of the second gas engine I, and the second exhaust gas heat exchanger g is provided in the exhaust system of the second gas engine. Further, a second heat exchanger 6 is provided in the cooling circuit of the gas engine 2 of rN; 2, and a cooling water circuit 10' for the supply air cooler and an aftercooler circuit 11 are provided in the second gas engine 2 It is.

A pump I2 whose suction side is connected to the outlet side of the absorption refrigerator 9
The discharge side of is connected to the low temperature side of the second heat exchanger 6 through the fourth pipe line 15 (-, the high temperature side of the second heat exchanger 6 is connected to the fifth pipe line 16) -7 is connected to the low temperature side of the second exhaust gas heat exchanger 8;
A 1.6 pipe 17'8- is connected to the inlet side of the absorption refrigerator 9 to Il.
I am in touch with you through this.

Next, a method of controlling ff1lJ of the engine I13'+ m+) water pump device according to the present invention will be described with reference to the seventh ff/1 and all subsequent parts.

If the exhaust heat recovery pump does not start properly by pressing the operation button on the control panel, the first gas engine 1
The power of the ignition device is turned on to ignite the gas in the combustion chamber,
After the battery relay for turning on and off the e side of the battery is turned on and the fuel gas solenoid valve is turned on, the scooter for starting the first gas engine 1 is turned on.The first gas engine 1 is started by turning it on.

When the first gas engine 1 does not move (rotation is 65
If Orpm or less, it is judged that it will not start (tlR), 10
After a period of seconds to rest the starter, Stark becomes human again and starts the first gas engine 1.

If the first gas engine 1 does not start, the starter is 10
After repeating on and off three times at intervals of seconds, a starting problem appears. (If the first gas engine 1 starts within this starting time, it enters the operating state).

When the first gas engine 1 is started, a warm-up operation is performed for 3 minutes to protect the first gas engine 1, and then an operation to increase the water pressure is performed for 3 minutes after the rotation reaches 180 rpm.

This is a diagram of the relationship between rotation and water pressure I-i in Figure 3. Water pressure is 6
．． When it is 4 or less? - Operate the water pressure to 1180 Orpm and increase the water pressure to 1660 rpm between 6.4 and 6.6 rpm.
It is operated at a water pressure-matched rotation as shown in FIG. 3 with a rotation of ~Igoorpm.

When the water pressure is 66% or more, it is operated at a constant +660 rf) m. In addition, when the water pressure is 66% or more, for example 7
When the water pressure reaches about 21, the author determines that the water pressure is too high and stops the first gas engine 1. It is.

After 3 minutes of operation at + go o rpm, detect the water pressure, and if it is below 64%, turn + go o rpm again.
Run for 3 minutes in between.

If the speed is 6.4 or higher, perform the rotation on the rotation side for 3 minutes between 1660 and 1800 rpm.

These 3 minutes are a dead zone for extremely suppressing fluctuations of -1 rotation and fluctuations in the number of units in number control. As shown in Figure 8.

After 3 minutes of running at 1,660 to 1,800 rpm, the water pressure is detected and if it is less than 6.4 rpm, the system changes to IFEOOrpm and operates for 93 minutes. 1660 r if the water pressure is over 66'M
After 3 minutes at pm, the water pressure is detected again [If it is 26.6 short or higher, a "water pressure increase" warning will be issued, and if it is 66 or lower, 1j
: I 660-1 Rotation control is performed at 800 rpm for 3 minutes and the water pressure is detected.

Even after 3 minutes of rotation at 1800 rpm, the pressure remains at 6
．． When the engine speed is 4 or less, the second gas engine 2 starts and after warming up, the rotation speed is 1εQ as in the first engine.
It becomes rpm.

The water pressure is detected when two gas engines 1 and 2 are running in parallel, and when it is 64 or higher, it is 1660 to 800 rpm.
Control the rotation for 3 minutes, then detect the water pressure again, and if it is less than 64 degrees, operate at lFE 00 rpm for 3 minutes.

When the water pressure is over 66%, the water pressure is detected after 3 minutes at +66 Orpm, and when it is over 6V, parallel operation of two 1-j units is not necessary, so the second gas engine 2 is maintained and stopped after rlk operation, and the first Set gas engine 1 to 180 rpm. *Return to step 1.

When the water pressure is below 6.6 degrees, the rotation control 111 at 1660" and 1 gOOrpm is performed for 3 minutes, and the water pressure is detected again as shown in FIG.

When the water pressure is 6.4, the rotation is controlled at 1660-1800 rpm for 3 minutes and the water pressure is detected again.

After 3 minutes at l g OOrpm, detect the water pressure again, and if it is less than 6.4υ, the electric pump will not start properly.Fi'? li), two gas engines 1.2 are running at 800 rpm, the first and second gas
After 3 minutes of parallel operation of ゜2 and electric pump, water pressure is detected and if it is 6.4 monme or less, 1 water pressure decrease J flBi << 1
4 comes out.

By the way, what about "low water pressure"? If i Qi appears, action 171:
At the operator's discretion, other electric pumps are started, but it is possible to output 111 No. 7 up and down instead of the full report "under the hydraulic desk" and operate other gas engines and electric pumps fully automatically. .

When the water pressure is 6.6 short or higher, the electric pump is unnecessary and stops.

(In order to prevent water hammer, when the electric R1 pump is stopped, a stop notice signal is issued, and the operator closes the valve using that signal, and then the electric pump stops.) , gas engine 1.2 is operated at 1800 rpm for 3 minutes and controlled as shown in *2.

The above is the control of the parallel operation of the first and second gas engines 1 and 2 and the electric pump, but the same applies even if a plurality of gas engines are used instead of the electric pump.

If one of the two first and second gas engines 1.2 cannot be operated due to a failure, safety inspection, etc. (in the case of parallel operation of one gas engine and electric pump), the situation will be as shown in Figure 9. .

That is, the control for operating one gas engine I is the same as described above. Water pressure is 64 when one first gas engine 1 is operated.
(If the electric pump does not start properly, an alarm will be issued) and parallel operation will be performed.

Detects the water pressure, and if it is below 64 liters, a "low water pressure" alarm will be issued. If it is above &44 liters, unlike the operation with two gas engines and an electric pump, gas engine 1 has a pressure of 1,660 to 1,660 liters.
Rotation control is performed at 800 rpm (1! to prevent the pump from starting and stopping).

The stop control is as shown in FIG.

In other words, stopping with the stop button, stopping with the emergency stop button,
This is a case where the engine stops due to an abnormality.

When the engine is stopped by pressing the stop button, a three-minute protective operation is performed to protect the gas engine, and the battery relay, gas valve, and ignition thread are turned off to stop the first and second gas engines 1 and 2.

Control in the event of a gas engine failure during gas engine operation is as follows.

(1) If gas engine 1 breaks down while one gas engine is in operation, a gas engine abnormality alarm will be activated.
The second gas engine 2 automatically enters operation.

(2) If one of the two gas engines breaks down while it is in operation, an alarm will issue a signal to start the stain pump.

(3) If one gas engine breaks down while the two gas engines 1 and 2 and the electric pump are in operation, a notification of engine abnormality and water pressure drop will be issued.

FIG. 11 shows an operating diagram of the water pump device.

The line segment ■-■ in FIG. 11 is the operating line of the first pump 3 when the first gas engine 1 is operated, and the line segment ■-■ is the operating line of the first pump 3 when the first gas engine 1 is operated. The first case when driving
, the compound operating line of the second water pump 3.4, line segment ■-
■ is a composite operation line for the operation of two gas engines 1 and 2 and the intermittent operation of one electric pump, and the line segment ■-■ is the line for the operation of two gas engines 1 and 2 and one electric pump. It is a composite operating line.

The middle line in FIG. 11 is the performance curve of the electric pump alone, the opening is the performance curve of the first water pump 3 driven by the first gas engine 1, and the line C is the performance curve of the second water pump 4 driven by the second gas engine 2. This is the performance curve of

When the load resistance is in range A, constant operation is performed at 660 rpm, and an alarm is issued if the pressure exceeds 66'M.

When the load resistance is in range B, one gas engine is used ■
(= Follow-up operation between ゛■.

When the load resistance is in range C, gas engine 1.2 of 2
Perform follow-up operation between ■ and ■ on the stand.

When the load resistance is within the range, the gas engine 1.202
One electric pump and one electric pump are operated at a constant speed of 1800 rpm each, and if the discharge pressure drops to 64, an alarm will be issued.

As described in detail above, the present invention is provided with a plurality of water pumps 3, 4 driven by a plurality of engines 1, 2, and the pressure on the load side of the water pumps 3, 4 (water pump discharge pressure)
The system detects the engine 1 and controls the rotation of the engine 1 and 2 so that the pressure on the load side is always constant or within a certain range even if the resistance on the load side increases or decreases, and also controls the number of engines 1 and 2. , 2. This is a control method for an engine-driven water pump device that controls the stoppage of abnormal equipment and the operation of normal equipment when an abnormality occurs in the water pumps 3 and 4.

Therefore, it is possible to automatically control the rotation of engines 1 and 2 by increasing and decreasing the load resistance, control the number of engines 1 and 2, and stop abnormal equipment and control the operation of normal equipment. This eliminates the trouble of manually controlling the rotation of the engine to keep the water pressure constant by driving the water pump and having the operator open and close the noggle to keep the water pressure constant.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the configuration of the engine-driven water pump device, Figure 2
The figure is a flowchart of a control method for an engine-driven water pump device according to the present invention, FIG. 3 is a relationship diagram between the water pressure of the water pump and the engine rotation speed, and FIGS. 4 to 8 are performance curve diagrams of the water pump. FIG. 9 is a control flowchart when one engine cannot be operated, FIG. 1O is a control flowchart when the engine is stopped, and FIG. 11 is an operation diagram of the engine-driven water pump device. 12 is the engine, 3 and 4 are water pumps. Fig. 3 Water pressure kQ/ClTl' Fig. 7 Cable Fig. 4 Cable Fig. 8 Cable

Claims (1)

[Claims] A plurality of water pumps 31 driven by a plurality of engines 1 and 2
4, the pressure on the load side of the water pump 3.4 (water pump discharge pressure) is detected and the pressure on the load side is always constant or within a certain range even if the resistance on the load side increases or decreases. It fully controls the rotation of the engines 1 and 2, and also controls the number of engines 1 and 2, as well as the engines 1 and 2, and the water pumps 3 and 4.
1. A method for controlling an engine-driven water pump device, characterized in that when an abnormality occurs, stopping of abnormal equipment and operation of normal equipment are controlled.