JPH1146497A - Drainage pump vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install an operation controller on a vehicle body easily by size and weight reduction, conduct operation control of prompt response to an increase or decrease in flow rate required for drainage, and further absorb shock onto a piping system and a vehicle body when a pump is started. SOLUTION: A generator 10 driven by an engine 5 is taken as a fixed frequency power source for operation, and four drainage pumps 11A-11D whose starting priority has been specified are formed so that connection switching to a single inverter 17 may be conducted selectively. In increasing a flow rate required for drainage, low-speed starting and revolutions raising control by an inverter 17 are conducted sequentially using a drainage pump whose starting priority is the highest through a pump whose starting priority is the lowest. The drainage pumps of the high priority rather than low priority, of the drainage pumps which have been started at this point, are subjected to constant speed rotation by a fixed frequency power source. In decreasing a flow rate, rotational speed lowering control by the inverter 17 are conducted sequentially using a drainage pump whose starting priority is the lowest through a pump whose starting priority is the highest at that time. The operation of the drainage pump of the lowest priority of the drainage pumps which have been started at this point is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pump truck used for emergency drainage in the event of a water disaster, temporary drainage for civil engineering works, agricultural water supply and drainage, and the like. The present invention relates to a drainage pump vehicle provided with an operation control device for sequentially starting or stopping a plurality of drainage pumps according to an increase or decrease in required drainage flow rate according to a predetermined startup order.

[0002]

2. Description of the Related Art In this type of drainage pump truck, a plurality of drainage pumps are operated using a generator to which the output of an engine is transmitted via a power transmission system as a constant frequency power supply for drainage operation. In general, when controlling the operation of a plurality of drainage pumps, the rate of increase / decrease of the required flow rate of drainage is set to a predetermined value (usually 100% when increasing and 50% when decreasing). Until the preset value is reached, means for increasing or decreasing the rotation speed of the drain pump in the activated state via the inverter is employed.

As a means for controlling the operation of a drain pump using an inverter in a drain pump car, a conventionally known means for controlling the operation of a drain pump is the first one in which the starting order is specified in the highest rank as shown in FIG. Electric drainage pump 1
An inverter 4 is provided in an electric connection circuit between a motor 2A serving as a prime mover of A and a constant frequency power supply 3 composed of a generator linked to a traveling drive engine (not shown) via a power transmission system.
, 2N and the constant frequency power supply 3 of the motors 2A, 2B,..., 2N of the second to Nth drain pumps 1B, 1C,. Each of the starters 30B, 30C,.
0N was interposed.

[0004]

As described above, in a conventional drainage pump car employing a pump operation control means comprising a combination of one inverter 4 and a plurality of starters 30B to 30N, the number of pumps It is necessary to install the number of starters equal to 1 from the above, so that the pump operation control equipment becomes very large, heavy and expensive, and furthermore, a drain pump whose rotation speed can be controlled by the inverter 4 is required. It is fixed to the drainage pump 1A of the first rank in the starting order,
The other 2nd to Nth drain pumps 1B, 1C, ...,
Since 1N is restricted to constant speed rotation, not only is control response to increase / decrease in the required flow rate of drainage insufficient, but also the number of switching operations for starting or stopping the operation is unnecessarily large, resulting in a high failure rate. There is a disadvantage.
In addition, the starting current of the drainage pump using the starter is larger than that at the time of starting by the inverter, so that when the pump is started up, a large impact is applied to the piping system such as the drainage hose, causing the hose to dance and the accompanying damage. There is a problem that when the drain pump having the lowest starting order is started via the starter, a large impact reaction force acts on the vehicle body and the pump car itself may move.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is not necessary to install a starter, so that the operation control device can be reduced in size and weight so that it can be easily mounted on a vehicle body. It is an object of the present invention to provide a drainage pump car that can exhibit quick response to pump operation control for a change in required flow rate and that can reduce impact on a piping system and a vehicle body when the pump is started.

[0006]

According to one aspect of the present invention, there is provided a drainage pump truck according to the present invention, wherein an engine and an output of the engine are transmitted through a power transmission system to generate power. A generator, a plurality of drainage pumps in which the generator is used as a constant-frequency power source for operation, and the starting order is specified, and a single inverter for controlling the number of rotations is provided;
A truck-type switch comprising: a switch for selectively connecting and connecting the inverter to the plurality of drain pumps; and an operation control device for controlling the operation of the plurality of drain pumps in accordance with an increase or decrease in the required drain flow rate. A drain pump car, wherein the operation control device activates the drain pump having the highest rank at the time when the required drain flow rate increases through the inverter, and controls the rotation speed of the drain pump to a predetermined value. When the control rotation speed is increased to a predetermined value and the required drainage flow rate is still increasing, the inverter is connected to the next lower-order drainage pump in the starting order, and the next lower-order drainage pump is connected to the inverter. At the same time, the rotation speed of the pump is controlled to rise to a predetermined value. Te is constant speed, while the rotational speed of the drainage Ponpu the lowest start-up order is when reduction of the waste water flow demand at that time descends controlled through the inverter,
At the stage where the control rotation speed is lowered to a predetermined value, and when the required drainage flow rate still decreases, the inverter is connected to the next higher-order drainage pump in the starting order and the rotation speed of the next higher-order drainage pump is changed to the inverter. , And is configured to stop the drainage pump whose activation order is lower than that.

According to the first aspect of the present invention, when the required drainage flow rate increases, the inverter is sequentially connected to the next lower drainage pump in the starting order, and the starting order is higher than that. The upper drain pump is rotated at a constant speed via the generator's constant-frequency power supply, and when the required drainage flow rate decreases, it is sequentially connected and switched to the next higher drain pump in the starting order, and the lower drain pump. In the case of increasing or decreasing the required flow rate of drainage, for example, when a single inverter is connected to a plurality of drainage pumps, the single inverter itself is replaced with a plurality of starters. This makes it possible to reduce the size, weight, and cost of the pump operation control device, thereby facilitating mounting on the vehicle body. In addition, any of the multiple drainage pumps can be started and controlled by the inverter by appropriately responding to the increase or decrease in the required drainage flow rate, making it extremely responsive to changes in the required drainage flow rate. Excellent operation control can be performed. In addition, since all of the multiple drain pumps can be started at a low speed by the inverter, the impact on the piping system such as the drain hose when the pump is started is reduced, and the body of the vehicle due to the dancing phenomenon of the drain hose and the reaction force is reduced. Movement can be sufficiently mitigated.

[0008] In particular, in the drainage pump truck according to the first aspect of the present invention, as described in the second aspect, the frequency, voltage and phase of the inverter are set between the inverter and the constant frequency power supply by the generator. The drainage pump was switched from rotation speed control by the inverter to constant-speed rotation by the constant-frequency power supply by adjusting it to synchronize with those of the constant-frequency power supply and by providing a synchronization input device that allows connection switching after synchronization was detected. It is possible to reduce the occurrence of the inrush current immediately after.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram centering on a power system of a drainage pump truck according to the present invention. A truck-type drainage pump truck circulates cooling water in a vehicle body with a water-cooled engine 5 and a water jacket of the water-cooled engine 5. A radiator 7 interposed in the cooling water circulating system 6 to cool the cooling water by heat exchange with the outside air accompanying the operation of the cooling fan 16, a power transmission system 9 for transmitting the output of the water-cooled engine 5 to the traveling wheels 8, A power generator 10 that receives the output of the water-cooled engine 5 through a power transmission system 9 to generate power, and a plurality of power generators 10 that use the power generator 10 as a constant-frequency power source for drainage operation (shown in FIG. The number of electric drain pumps 11A, 11B, 11C, and 11D and the motors 12A, 12B, 12C, and 12D are mounted.

The power transmission system 9 includes the water-cooled engine 5
, A clutch-equipped output take-out device 13, a transmission 14, and a differential (not shown),
The output of the transmission 14 is transmitted to the running wheels 8 via a differential. The power take-off device 13 with a built-in clutch is connected to an air-cooled reducer 15 capable of transmitting the output of the water-cooled engine 5 in a vehicle stopped state in which power transmission to the running wheels 8 is stopped via the built-in clutch. The generator 10 serving as the above-mentioned constant frequency power supply for drainage operation is driven via the air-cooling speed reducer 15.

On the other hand, the four drain pumps 11A, 1
B, 11C, and 11D are arranged side by side with the starting order defined, and their respective drainage pumps 11A, 1B, 11C, and 11D are arranged.
As shown in FIG. 2, a single inverter 17 for controlling the rotation speed and a single inverter 17 for controlling the number of rotations are provided in the electrical connection circuit between the motors 12A, 12B, 12C, and 12D of the D and the generator 10 serving as the constant frequency power supply for drainage operation. The inverter 17 is connected to each of the drain pumps 11
A, 1B, 11C, 11D motors 12A, 12B, 1
Switch 1 for selectively switching connection between 2C and 12D
8 and the four drain pumps 11A, 1B, 11C, 11 according to the increase and decrease of the required drainage flow rate.
An operation control device 19 for controlling the operation of D is provided. Further, between the inverter 17 and the generator 10, the frequency, voltage and phase of the inverter 17 are adjusted so as to match the frequency, voltage and phase of the constant frequency power supply by the generator 10, so that the synchronization between the two is achieved. A synchronization input device 20 is provided for allowing connection switching from the inverter 17 to the constant frequency power supply after detection.

FIG. 3 shows an example of the internal structure of the switching unit 18. One movable contact 18a provided on the output side of the inverter 17 and operated by a control signal from the operation control unit 19 is connected to the drain pump 11A. , 1B, 11C, 1
Fixed contacts 12a, 12b, 12c, 1 provided on the input side of 1D motors 12A, 12B, 12C, 12D
2d by selectively contacting each motor 2d.
A, 2B, 2C,..., 2N and the normally closed contacts 12a-b, 12b-b, 12c-b, 12db which are interposed in the electrical connection circuit between the generator 10 and the constant frequency power supply are automatically opened. Then, the inverter 17 is connected to each of the motors 12A,
The connection is switched between 12B, 12C and 12D.

Next, a description will be given of a pump operation control operation in the drain pump car having the above-described configuration. The drain pump car travels by transmitting the output of the power take-off device 13 with a built-in clutch of the power transmission system 9 driven by the output of the water-cooled engine 5 to the traveling wheels 8 via the transmission 14 and the differential. When the vehicle is running, the engine 5
The cooling water in the water jacket is circulated between the cooling water circulating system 6 and the radiator 7 and is cooled by heat exchange with the outside air accompanying the operation of the cooling fan 16.

When the transmission of power to the traveling wheels 8 is stopped via the built-in clutch of the power take-off device 13 with built-in clutch, the water-cooled engine 5 is stopped.
Is transmitted to the air-cooling speed reducer 15 through the power take-off device 13 with a built-in clutch, and the generator 10 serving as the constant-frequency power source for drainage operation is driven via the air-cooling speed reducer 15, whereby The drainage pumps 12A to 12D are operated to perform drainage work in a vehicle stopped state.

[0015] In the draining operation in the vehicle stopped state, when the required drainage flow rate is increasing, the starting order is the first.
Motor 12A of the drain pump 11A of the
At a low speed via the inverter 17 and, at the same time, for example, until the drain hose becomes full of water, the rotation speed of which is controlled to increase via the inverter 17. The starting order of the drainage pump 11 is the first.
A control speed of the motor 12A is a predetermined value, for example, 100
%, When the required flow rate of drainage is still increasing, the switching unit 18 is switched by a control signal from the operation control unit 19 to operate the inverter 1.
7 is the motor 12 of the drain pump 11B whose starting order is second.
The connection is switched to the B side to start the motor 12B at a low speed.
Control at the same time, and at the same time, the top drainage pump 11A
The motor 12A is connected to the constant frequency power supply by the generator 10 and is switched to rotate at a constant speed. That is, one drainage pump 12A is set to a fixed speed, and the other drainage pump 12B is controlled by the inverter 17 for the rotation speed.

The rotation speed of the motor 12B of the drain pump 11B having the second starting order is, for example, 100%.
When the flow rate is still increasing even after the rise control is performed, the switch 18 is switched by the control signal from the operation control device 19 to activate the inverter 17 in the third order.
The motor 12C of the second drain pump 11B is connected to the motor 12C of the second drain pump 11C at a low speed, and the rotation speed of the motor 12C is controlled to increase through the inverter 17. At the same time, the motor 12B of the second drain pump 11B is The connection is switched to the constant frequency power supply side by 10 to rotate at a constant speed. In other words, the two drain pumps 11A and 11B are set to a fixed speed, and the other drain pump 11C is controlled in rotation speed by the inverter 17, so that the number of pumps to be operated is increased with the increase in the required flow rate of the drain. The connection of the motors whose rotation speed is controlled by 17 is sequentially switched to a motor having a lower starting order.

On the other hand, when the required drainage flow rate is decreasing,
The switching device 18 is switched by a control signal from the operation control device 19, and at that time, the rotation speed of the motor 12B of the drain pump connected to the inverter 17, for example, the drain pump 11B having the second highest starting order, is changed by the inverter. The lowering control is performed by 17. If the required flow rate of the drainage water is still decreasing even if the rotation speed of the motor 12B of the drainage pump 11B whose starting order is the second is controlled to a predetermined value, for example, 50%, the control from the operation control device 19 is performed. The switching unit 18 is switched by a signal, and the inverter 17 is activated by the motor 1 of the drain pump 11A having the first starting order.
The connection is switched to the 2A side to control the number of rotations of the motor 12A down through the inverter 17, and
As the required drainage flow rate decreases, the number of pumps to be operated is reduced, such as stopping the operation of the motor 12B of the drainage pump 11B, and the motors whose rotation speed is controlled by the inverter 17 are sequentially connected to the higher-ranking ones. Switch. And when the drainage required flow rate becomes zero,
The movable contact 18a of the switch 18 is switched to the power-off position 12e by a control signal from the operation control device 19, and the power output device 13 with the built-in clutch is disconnected to stop driving the generator 10.

In the operation control operation of the pump, when the connection is switched from the inverter 17 to the constant frequency power supply by the generator 10, the frequency, voltage and phase of the inverter 17 and the constant frequency power supply After the frequency, the voltage and the phase of the inverter 17 match and the synchronization between the two is detected, the connection switching from the inverter 17 to the constant frequency power supply is permitted. The occurrence of the rush current immediately after switching to the high-speed rotation is very small, and it is possible to bring a good result to the life of the motor.

[0019]

As described above, according to the first aspect of the present invention, a single inverter is sequentially connected to a plurality of drainage pumps when the required drainage flow increases or decreases. It is possible to switch the connection and replace the inverter itself with a starter for a plurality of drain pumps, as compared with a conventional inverter in which one inverter and a plurality of starters are installed corresponding to a plurality of pumps. Therefore, it is possible to reduce the size, weight, and cost of the pump operation control device, so that it is easy to mount the pump operation control device on the vehicle body, and to increase the maximum drainage capacity while increasing the overall pumping vehicle capacity. The size and weight can be reduced. Moreover,
Any of the multiple drainage pumps can be started and controlled by an inverter in response to the increase or decrease in the required drainage flow rate. Operation control can be performed. In particular, since any of the multiple drainage pumps can be started at a low speed by the inverter, the impact on the piping system such as the drainage hose when the pump is started is reduced, and the body of the vehicle due to the dancing phenomenon of the drainage hose and the reaction force is reduced. There is an effect that the movement can be sufficiently mitigated.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the connection switching from the inverter to the constant frequency power supply is performed by changing the frequency of both the frequency and the constant frequency power.
Since the synchronization is performed after voltage and phase synchronization is detected, it is possible to reduce the occurrence of inrush current immediately after switching the drive motor of the drain pump from the rotation speed control by the inverter to the constant speed rotation by the constant frequency power supply. it can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram centering on a power system of a drainage pump truck according to the present invention.

FIG. 2 is a schematic configuration diagram of a pump operation control system in the same drainage pump car.

FIG. 3 is a diagram showing an example of the internal configuration of a switch in the system.

FIG. 4 is a schematic configuration diagram of a pump operation control system in a conventional drainage pump truck.

[Explanation of symbols]

 Reference Signs List 5 Water-cooled engine 9 Power transmission system 10 Generator (constant frequency power supply) 11A to 11D Drain pump 17 Inverter 18 Switching device 19 Operation control device 20 Synchronous input device

Claims (2)

[Claims] 1. An engine, a generator for generating an electric power by transmitting the output of the engine via a power transmission system, and using the generator as a constant-frequency power source for operation and having a predetermined starting order and juxtaposed. A plurality of drain pumps, a single inverter for controlling the number of rotations, a switch for selectively connecting and switching the inverter to the plurality of drain pumps, and the plurality of An operation control device for controlling the operation of the drainage pump of the present invention is a truck-type drainage pump truck, the operation control device comprising: Starting through the inverter, the rotation speed is controlled to increase to a predetermined value, and at the stage when the control rotation speed is increased to the predetermined value, when the required drainage flow rate still increases, the above-mentioned inversion is performed. The starter is connected to the next lower-order drainage pump, the lower-order drainage pump is started via the inverter, and the rotation speed is controlled to rise to a predetermined value. The drainage pump is rotated at a constant speed through a constant frequency power supply by the generator, while when the required drainage flow rate decreases, the rotation speed of the drainage pump with the lowest starting order at that time is controlled to decrease via the inverter. At the stage when the control rotation speed is lowered to a predetermined value, and when the required drainage flow rate still decreases, the inverter is connected to the next-higher-order drainage pump whose starting order is switched and the rotation speed of the next-highest drainage pump is changed. A drainage pump truck characterized in that it is configured to perform a descending control via an inverter, and to stop a drainage pump whose starting order is lower than that. 2. A method for adjusting the frequency, voltage and phase of the inverter between the inverter and the constant-frequency power supply by the generator so as to synchronize them with those of the constant-frequency power supply. 2. The drainage pump truck according to claim 1, further comprising an allowable synchronous charging device.