JPH11132152A - Engine drive hydraulic pump unit for drain pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine drive hydraulic pump unit for a drain pump in which placing work of a drain pump to a water region in a drain or supply/ discharge water site and laying work of a power supply system can be easily performed, any oscillation of a drain hose can be suppressed, and operation is conducted at reduce initial and running costs by a low-output and small-sized engine. SOLUTION: An engine drive hydraulic pump unit for a drain pump comprises an engine 1; a hydraulic pump 6 driven by the engine 1; hydraulic motors 8A-8D for driving a drain pump driven by the hydraulic pump 6; and drain pumps 10A-10D independently operated by the hydraulic motors 8A-8D for driving the drain pump. The drain pumps 10A-10D are started by low-speed rotation of the hydraulic motors 8A-8D for driving the drain pump. After a lapse of a predetermined time, an engine speed is increased, so that engine speeds of the hydraulic motors 8A-8D for driving the drain pumps are increased up to rated speeds, for rated operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven hydraulic pump unit for a drainage pump used for emergency drainage in the event of a water disaster, temporary construction work drainage or agricultural water supply and drainage.

[0002]

2. Description of the Related Art As shown in FIG. 4, a diesel engine 1 and an engine 1 are used as an engine-driven electric pump unit for a drain pump used for emergency drainage in case of a water disaster, temporary drainage for civil engineering work or agricultural water supply and drainage. , A plurality of (for example, four) electric motors 3A, 3B, 3C, and 3D for driving a drainage pump driven by power supply from the generator 2, and an electric motor for driving the drainage pump. There is known a motor provided with a plurality of (for example, four) submersible pumps 4A, 4B, 4C, and 4D that are operated by being integrally connected to the motors 3A, 3B, 3C, and 3D, respectively.

[0003] In this type of engine driven electric pump unit for a drain pump, an electric motor 3A for driving the drain pump is provided.
Four power cables 5A, 5B, 5C, 5D provided with start switches SW of 3B, 3C, 3D, respectively.
And four drainage hoses (not shown) connected to the respective discharge ports of the submersible pumps 4A, 4B, 4C, and 4D, and transported together with the pump unit to a location near a drainage or water supply / drainage site by an appropriate transport vehicle. Is done.

When the vehicle arrives near the drainage or water supply / drainage site, the output terminal of the generator 2 and the input terminals of the electric motors 3A, 3B, 3C, 3D for driving the drainage pump are connected to the power cables 5A, 5B, 5C, 5C. After connecting with 5D, 1
Or two or more submersible pumps 4A, 4B, 4C, 4D
Into the water area at the drainage or plumbing site, the generator 1 is driven by the engine 1, and one or more submersible pumps 4A, 4A,
By turning on the start switches SW corresponding to 4B, 4C, and 4D, one or more electric motors 3A, 3B, 3C, and 3D for driving a drainage pump are started to perform a drainage operation.

However, in the conventional engine-driven electric pump unit for a drainage pump, the submersible pumps 4A, 4B, 4C, and 4D are operated by being integrally connected to the electric motors 3A, 3B, 3C, and 3D for driving the drainage pump. The weight and volume of the power cable 5A, 5
Since B, 5C, and 5D have large diameters and large weights, the installation work is difficult. In addition, each submersible pump 4A, 4B, 4C, 4
D is the electric motor 3A, 3B, 3C, 3 for driving the drainage pump.
Since the operation is performed by D, high-speed operation is performed at the rated output immediately after the operation is started. For this reason, each submersible pump 4A,
4B, 4C, and 4D suddenly discharge at a rated discharge amount immediately after startup, and greatly swing the drainage hose for a relatively long time immediately after startup. Therefore, complicated work for fixing the four drainage hoses is required. Moreover,
Since the generator 2 having a relatively large power generation capacity must be driven with a high torque, in the case of a direct-initiated start-up type, a large-sized diesel engine 1 having a large output is required. There are problems such as an increase in cost and running cost.

[0006]

That is, in the conventional engine-driven electric pump unit for a drainage pump, since the weight and volume of the electric motor-driven submersible pump are large, it is difficult to perform the operation of draining or putting water into a water area at a water supply / drainage site. At the same time, since the power cable is large in diameter and heavy in weight, it is difficult to lay the power supply system. In addition, since the submersible pump is driven by the electric motor for driving the drainage pump, the submersible pump is operated at high speed with the rated output immediately after the start of operation, and each submersible pump discharges at the rated discharge amount immediately after the start, so immediately after the start. The drain hose is swung largely for a relatively long time. Therefore, complicated work for fixing the drain hose is required. Moreover, since the generator with a relatively large power generation capacity must be driven with high torque,
There is a problem that a large engine having a large output is required, and initial costs and running costs are increased. Therefore, the present invention facilitates the operation of putting a drain pump into a water area at a drainage or water supply / drainage site and the work of laying a power supply system, suppresses the swing of a drainage hose, and uses a low-power small engine to initialize the drainage hose. It is an object of the present invention to provide an engine-driven hydraulic pump unit for a drain pump that can perform operation with low cost and running cost.

[0007]

According to one aspect of the present invention, there is provided an engine-driven hydraulic pump unit for a drain pump according to the present invention, comprising: an engine; a hydraulic pump driven by the engine; A plurality of drainage pump driving hydraulic motors driven by hydraulic pumps, and a plurality of drainage pumps individually driven by these drainage pump driving hydraulic motors, the first drainage pump is
The operation is started by driving the hydraulic pump by the idling operation of the engine and low-speed rotation of the first hydraulic motor for driving the first drainage pump driven by the hydraulic pump. The drainage pump driven by increasing the number of revolutions of the hydraulic motor for driving the drainage pump to the rated rotation is operated at the same time as the second and subsequent units. The operation is started by the low-speed rotation reduced by the load, and after a lapse of a predetermined time, the number of rotations of the engine is increased to increase the number of rotations of the second and subsequent drainage pump driving hydraulic motors to the rated number. It is characterized by being configured to drive.

According to a second aspect of the present invention, there is provided an engine-driven hydraulic pump unit for a drain pump, comprising: an engine; a hydraulic pump driven by the engine; and a plurality of drain pumps driven by the hydraulic pump. Hydraulic motor, and a plurality of drain pumps individually operated by these drain pump driving hydraulic motors. The rated operation of the engine is performed. By adjusting the discharge rate and gradually increasing the rotation speed of the hydraulic motor for driving the drainage pump from low speed rotation to rated rotation,
The drain pump that is operated to be increased after the second unit starts operating by the increased hydraulic motor for driving the drain pump and the low-speed rotation that is reduced by the loading of the drain pump, and after a predetermined time elapses, the hydraulic pressure by the regulator is increased. It is characterized in that the number of drain motors for driving the drainage pumps, which has been increased to the second and subsequent units by the adjustment of the discharge amount of the pressure oil of the pump, is gradually increased to the rated rotation for operation.

According to the first aspect of the present invention, the weight and volume of the hydraulic motor for driving the drainage pump driven by the hydraulic pump are smaller than the weight and volume of the electric motor for driving the drainage pump having the same output. The weight and volume of the drainage pump driven by the hydraulic motor for driving the drainage pump is smaller than the weight and volume of the submersible pump having the same drainage capacity. The outer diameter and weight of a power supply system composed of a hydraulic oil supply hose connecting a hydraulic pump and a hydraulic motor for driving a drainage pump and an oil return hose for returning oil after passing the hydraulic motor for driving a drainage pump to an oil tank are as follows: It is smaller than the outer diameter and weight of the power supply system composed of the power cable. In addition, the operation of the drain pump is started by the low-speed rotation of the engine, and after a lapse of a predetermined time, the number of revolutions of the engine is increased to perform the rated operation of the drain pump. To gradually increase. Therefore, the swing of the drain hose can be suppressed. Further, since a generator having a large power generation capacity which must be driven at a high torque is not required, a small engine having a small output can be used.

According to the second aspect of the present invention, the weight and volume of the hydraulic motor for driving the drain pump driven by the hydraulic pump are smaller than the weight and volume of the electric motor for driving the drain pump having the same output, The weight and volume of the drainage pump driven by the hydraulic motor for driving the drainage pump is smaller than the weight and volume of the submersible pump having the same drainage capacity. The outer diameter and weight of a power supply system composed of a hydraulic oil supply hose connecting a hydraulic pump and a hydraulic motor for driving a drainage pump and an oil return hose for returning oil after passing the hydraulic motor for driving a drainage pump to an oil tank are as follows: It is smaller than the outer diameter and weight of the power supply system composed of the power cable. In addition, the engine is operated at rated speed, and the drainage pump is gradually increased from low-speed rotation to the rated rotation by adjusting the hydraulic oil discharge amount of the hydraulic pump by the regulator. It will gradually increase to the discharge amount. For this reason,
Swing of the drain hose can be suppressed. Further, since a generator having a large power generation capacity which must be driven at a high torque is not required, a small engine having a small output can be used.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic pump unit for a drain pump according to a first embodiment of the present invention; In FIG. 1, a hydraulic pump 11 driven by a diesel engine 1 and a hydraulic circuit 11 for circulating pressure oil pumped by the hydraulic pump 6 are provided. Couplers 12A are provided at four outlets of the hydraulic circuit 11. A coupler 12B is provided at four inlets. Then, the four couplers 12A and the four hydraulic motors 8A, 8B, 8C, 8D for driving the drainage pump are detachably connected to each other by the pressure oil hose 13A, and the four couplers 12B and the four drainage pumps are driven. The outlets of the hydraulic motors 8A, 8B, 8C, 8D can be detachably connected by pressure oil hoses 13B, and an electromagnetic or electric switching valve 7 is provided immediately upstream of each coupler 12A. I have. In addition, four hydraulic motors 8A, 8B, 8C, 8D for driving the drainage pumps
The drain pumps 10A, 10B, 10C, and 10D are individually operated.

The four drain pumps 10A, 10B, 10
C and 10D are, for example, small and lightweight submersible pumps that can be transported by human power. As an example of use, it is desirable that the amount of drainage per unit is 1.5 m ³ / min and the weight is about 25 kg. Hydraulic circuit 1
An electromagnetic or electric switching valve 14 is interposed in the pipeline between the hydraulic pumps 6 in 1 and the switching operation of the electromagnetic or electric switching valve 14 causes the hydraulic oil to drive four drainage pumps. It is sent to the hydraulic motors 8A, 8B, 8C, 8D or the return line 15. This return line 15
, A pressure oil cooling device 16 air-cooled by a fan driven by the diesel engine 1 is provided, and an electromagnetic or electric switching valve 17 is provided immediately upstream of the pressure oil cooling device 16. . By switching the electromagnetic or electric switching valve 17, the pressure oil is returned to the oil tank 19 through the pressure oil cooling device 16 or through the bypass line 18.

The temperature of the oil in the oil tank 19 is detected by a temperature sensor 20, and a temperature detection signal is input to a control means 21. When the control means 21 determines that the oil temperature is equal to or higher than 40 ° C. based on the input temperature detection signal, the control means 21 outputs a switching control signal to the switching valve 14 and Pump driving hydraulic motors 8A, 8B, 8
C, 8D, and the switching valve 1
7, a switching control signal is output to switch the pressure oil to the oil tank 19 through the pressure oil cooling device 16 so as to recirculate the pressure oil. If the control means 21 determines that the oil temperature is lower than 40 ° C. based on the input temperature detection signal,
A switching control signal is output to the switching valve 14 to switch the pressure oil from the hydraulic pump 6 to be sent to the return line 15, and a switching control signal is output to the switching valve 17 to output the oil tank through the bypass line 18. Switch to 19 to recirculate the pressure oil.

In the above configuration, the engine 1 is warmed up until the oil temperature reaches a set value. When the warm-up operation is completed, the engine enters an idling operation (low-speed operation). Here, when the operation switch (not shown) of the first drain pump 10A is operated, the first drain pump 10A is driven by the hydraulic pump 6 by the idling operation of the engine 1 and is driven by the hydraulic pump 6. The operation is started by the low-speed activation of the first drainage pump driving hydraulic motor 8A.
When the accelerator cylinder 22 shown in FIG. 3 is set to the position for operating one vehicle indicated by a solid line after a predetermined time (about 30 seconds) has elapsed, the engine 1 increases the rotation speed and the first hydraulic motor 8A for driving the drainage pump. The operation is performed by increasing the number of revolutions to the rated revolution.

When an operation switch (not shown) of the second drain pump 10B is operated, the hydraulic pump 8A for driving the second drain pump is brought into a state in which the hydraulic motor 8A for driving the first drain pump is rotated at the rated speed. Motor 8B and second drain pump 1
Since 0B is loaded and the amount of oil does not increase, the second drain pump 10A starts operating by low-speed rotation. When the accelerator cylinder 22 shown in FIG. 2 is set to a position for operating two units indicated by a broken line after a predetermined time (about 30 seconds) has elapsed, the engine 1 increases the number of revolutions, increases the discharge amount of the hydraulic pump 6, and sets the two units. Hydraulic motors 8A and 8B for driving the drainage pump
The operation is performed by increasing the number of revolutions to the rated revolution.

When an operation switch (not shown) of the third drain pump 10C is operated, the third drain pump driving hydraulic motors 8A and 8B are rotated at the rated speed, thereby driving the third drain pump 10C. The hydraulic motor 8C and the third drain pump 10C are loaded, and the third drain pump 10C
Start operation by low speed rotation. When the accelerator cylinder 22 shown in FIG. 2 is set to the position for operating the three units shown by the dashed line after a predetermined time (about 30 seconds), the engine 1
Is operated by increasing the number of rotations and increasing the number of rotations of the three hydraulic motors 8A, 8B, 8C for driving the drainage pump to the rated number of rotations.

When the operation switch (not shown) of the fourth drain pump 10D is operated, the three drain pump driving hydraulic motors 8A, 8B and 8C are rotated to the rated rotation.
The fourth hydraulic pump 8D for driving the fourth drain pump and the fourth drain pump 10D are loaded, and the fourth drain pump 10D is driven.
D starts operation by low-speed rotation. After a lapse of a predetermined time (about 30 seconds), the accelerator cylinder 22 shown in FIG.
Is set to the position of the four-unit operation indicated by the two-dot chain line, the engine 1 increases the number of rotations and increases the number of rotations of the four drainage pump driving hydraulic motors 8A, 8B, 8C, 8D to the rated number of rotations. drive.

The weight and volume of each of the drainage pump driving hydraulic motors 8A, 8B, 8C, 8D driven by the hydraulic pump 6 are the same as the respective weights of the drainage pump driving electric motors 3A, 3B, 3C, 3D having the same output. The hydraulic motors 8A, 8B, 8 for driving the drainage pump.
C, 8D driven drain pumps 10A, 10
The weight and volume of each of B, 10C, and 10D are smaller than the weight and volume of each of the submersible pumps 4A, 4B, 4C, and 4D having the same drainage capacity. For this reason, the work of putting the drain pump into the water area at the drainage or plumbing site becomes easy.
Further, since the outer diameter and weight of the power supply system formed by the pressure oil hoses 13A and 13B are smaller than the outer diameter and weight of the conventional power supply system formed by the power cable, the work of laying the power supply system becomes easier. .

In addition, the drain pumps 10A, 10B, 10
Since C and 10D start operation at low speed rotation and increase the engine speed after a predetermined time to perform rated operation, the discharge amount of each drainage pump gradually increases from a small discharge amount immediately after startup to the rated discharge amount. Will be. Therefore, the swing of the drain hose can be suppressed. Therefore, the complicated work of fixing the drainage hose, which has been conventionally performed, is reduced. Furthermore, since a generator having a large power generation capacity that must be driven at a high torque is not required, a small engine having a small output can be used, so that operation with low initial cost and running cost can be performed.

Next, an embodiment of an engine-driven hydraulic pump unit for a drain pump according to the present invention will be described with reference to the drawings. The same or corresponding parts as those of the engine-driven hydraulic pump unit for a drain pump according to the first aspect of the invention are denoted by the same reference numerals, and the description thereof will not be repeated. In FIG. 2, a hydraulic pump 6 is provided with a regulator 23 including a variable discharge piston pump.
Thus, the discharge amount can be adjusted while keeping the discharge pressure constant.

In the above configuration, the engine 1 is warmed up until the oil temperature reaches a set value. When the warm-up operation is completed, the engine enters an idling operation (low-speed operation). Here, when the operation switch (not shown) of the first drain pump 10A is operated, the first drain pump 10A is driven by the hydraulic pump 6 by the idling operation of the engine 1 and is driven by the hydraulic pump 6. The operation is started by the low-speed activation of the first drainage pump driving hydraulic motor 8A, and after a predetermined time (about 30 seconds) has elapsed, the accelerator cylinder 22 shown in FIG. 2 is set to the full-speed operation position. The hydraulic pump 6 is operated by increasing the discharge amount until the set hydraulic pressure is reached, and gradually increasing the rotation speed of the first hydraulic motor 8A for driving the drainage pump to the rated rotation.

When the operation switch (not shown) of the second drain pump 10B is operated, the hydraulic pump 8A for driving the second drain pump is brought into a state in which the hydraulic motor 8A for driving the first drain pump is rotated at the rated speed. Motor 8B and second drain pump 1
0B is loaded, and the hydraulic pump 6 increases the discharge amount until the hydraulic pressure reaches the set hydraulic pressure.
The operation is performed by gradually increasing the rotation speeds of A and 8B to the rated rotation.

When the operation switch (not shown) of the third drain pump 10C is operated, the second drain pump driving hydraulic motors 8A and 8B are rotated at the rated speed, and the third drain pump driving The hydraulic motor 8C and the third drainage pump 10C are loaded, and the hydraulic pump 6 increases the discharge amount until the hydraulic pressure reaches the set hydraulic pressure, and the rotation speeds of the three hydraulic motors 8A, 8B, 8C for driving the drainage pumps are rated. Drive gradually up to

When the operation switch (not shown) of the fourth drain pump 10D is operated, the three drain pump driving hydraulic motors 8A, 8B and 8C are rotated to the rated rotation.
The fourth drainage pump driving hydraulic motor 8D and the fourth drainage pump 10D are loaded, and the hydraulic pump 6 increases the discharge rate until the set hydraulic pressure is reached, and the four drainage pump driving hydraulic motors 8A, 8B , 8C, and 8D are gradually increased to the rated speed.

The weight and volume of each of the drainage pump driving hydraulic motors 8A, 8B, 8C, 8D driven by the hydraulic pump 6 are the same as the respective weights of the drainage pump driving electric motors 3A, 3B, 3C, 3D having the same output. The hydraulic motors 8A, 8B, 8 for driving the drainage pump.
C, 8D driven drain pumps 10A, 10
The weight and volume of each of B, 10C, and 10D are smaller than the weight and volume of each of the submersible pumps 4A, 4B, 4C, and 4D having the same drainage capacity. For this reason, the work of putting the drain pump into the water area at the drainage or plumbing site becomes easy.
Further, since the outer diameter and weight of the power supply system formed by the pressure oil hoses 13A and 13B are smaller than the outer diameter and weight of the conventional power supply system formed by the power cable, the work of laying the power supply system becomes easier. .

In addition, the drainage pumps 10A, 10B, 10C and 10D are started to operate at a low speed by the discharge amount adjustment by the regulator 23 comprising a variable discharge amount piston pump, and the drainage pumps are rated after a predetermined time has elapsed. Is gradually increased from the small discharge amount immediately after the start-up to the rated discharge amount. Therefore, the swing of the drain hose can be suppressed. Therefore, the complicated work of fixing the drain hose, which has been conventionally performed, becomes unnecessary. Furthermore, since a generator having a large power generation capacity that must be driven at a high torque is not required, a small engine having a small output can be used, so that operation with low initial cost and running cost can be performed. It should be noted that hydraulic units (such as hydraulic breakers and drills) other than the drainage pumps 10A to 10D can be operated by this unit. Even if the capacity of the hydraulic pump is different from that of the drainage pump motor, the pressure is controlled to be constant, so that the rated operation can be performed with a hydraulic motor having the same rated pressure (for example, 14 to 21 MPa).

The drain pumps 10A, 10B, 10
The number of C and 10D used is not limited to the number described in the above embodiment, and any number can be selected and used.

[0028]

As described above, according to the present invention, the weight and volume of a hydraulic motor for driving a drain pump driven by a hydraulic pump are smaller than the weight and volume of an electric motor for driving a drain pump having the same output. At the same time, the weight and volume of the drain pump driven by the hydraulic motor for driving the drain pump is smaller than the weight and volume of the conventional submersible pump having the same drain capacity. For this reason, the work of putting the drain pump into the water area at the drainage or plumbing site becomes easy. Also,
Since the outer diameter and weight of the power supply system formed by the pressure oil hose are smaller than the outer diameter and weight of the conventional power supply system formed by the power cable, the work of laying the power supply system becomes easier. In addition, since the drain pump is started to operate at a low speed and is operated after a predetermined period of time, the discharge amount of the drain pump gradually increases from a small discharge amount immediately after startup to the rated discharge amount. Therefore, the swing of the drain hose can be suppressed. Therefore, the complicated work of fixing the drain hose, which has been conventionally performed, becomes unnecessary. Furthermore, since a generator having a large power generation capacity that must be driven at a high torque is not required, a small engine having a small output can be used, so that operation with low initial cost and running cost can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the invention described in claim 1;

FIG. 2 is an explanatory diagram showing an operation state of an accelerator cylinder.

FIG. 3 is a configuration diagram showing one embodiment of the invention described in claim 2;

FIG. 4 is a configuration diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 diesel engine (engine) 2 boat-type sealed body 6 hydraulic pump 8A hydraulic motor for driving drain pump 8B hydraulic motor for driving drain pump 8C hydraulic motor for driving drain pump 8D hydraulic motor for driving drain pump 10A drain pump 10B drain pump 10C drain Pump 10D Drainage pump 23 Regulator

Claims (2)

[Claims] 1. An engine, one hydraulic pump driven by the engine, a plurality of hydraulic motors for driving a drainage pump driven by the hydraulic pump, and individually operated by the hydraulic motors for driving the drainage pump. A plurality of drain pumps, the first drain pump is driven by a hydraulic pump by idling operation of the engine,
The operation is started by the low-speed rotation of the first hydraulic pump drive hydraulic motor driven by this hydraulic pump, and after a predetermined time has elapsed, the engine speed is increased to increase the rotational speed of the first hydraulic pump drive hydraulic motor. And the drain pumps that are operated to increase after the second unit are driven by the increased hydraulic motor for driving the drain pump and the low-speed rotation that is reduced by the loading of the drain pump. Starting, after a lapse of a predetermined time, increasing the number of rotations of the engine to increase the number of rotations of the second and subsequent drainage pump driving hydraulic motors up to the rated number of rotations, thereby operating the engine. Engine driven hydraulic pump unit for drainage pumps. 2. An engine, one hydraulic pump driven by the engine, a plurality of drainage pump driving hydraulic motors driven by the hydraulic pump, and individually operated by the drainage pump driving hydraulic motors. A plurality of drain pumps, the engine is rated for operation, and the first drain pump rotates the drain motor at a low speed by adjusting a hydraulic oil discharge amount of the hydraulic pump by a regulator. The drain pumps, which are operated by gradually increasing the speed from the first rotation to the rated rotation, and operated by increasing the number of the second and subsequent units, are operated by the increased hydraulic motor for driving the drain pump and the low-speed rotation which is reduced by the load of the drain pump. And after the elapse of a predetermined time, increase to the second and subsequent units by adjusting the hydraulic oil discharge amount of the hydraulic pump by the regulator An engine-driven hydraulic pump unit for a drainage pump, characterized in that the number of the hydraulic motors for driving the drainage pump is gradually increased up to a rated rotation for operation.