KR20090044478A

KR20090044478A - Driving apparatus of industrial pump

Info

Publication number: KR20090044478A
Application number: KR1020070110597A
Authority: KR
Inventors: 기인서
Original assignee: 기인서
Priority date: 2007-10-31
Filing date: 2007-10-31
Publication date: 2009-05-07

Abstract

The present invention relates to a driving device for an industrial pump, and more particularly, to an industrial pump driving device which is safe and low in installation and maintenance cost by using a hydraulic circuit driven by a low pressure motor.

The driving apparatus of the industrial pump of the present invention includes a pump for transferring fluid by rotation of the impeller, a hydraulic motor for rotating the impeller connected to the rotating shaft of the impeller, and a hydraulic driving means for driving the hydraulic motor. The driving means is connected by the hydraulic motor and the first connecting pipe to transfer the hydraulic oil to a constant pressure, an electric motor for driving the hydraulic pump, supplying the hydraulic oil to the hydraulic pump and supplying the second connecting pipe from the hydraulic motor. It is provided with an oil tank for storing the working oil discharged through.

According to the driving device of the industrial pump of the present invention, by using the low pressure motor to operate the pump can significantly reduce the initial installation cost and maintenance costs, by configuring the hydraulic circuit to operate the pump freely design and electric safety accidents such as electric shock It can prevent the motor breakdown due to water leakage.

Industrial pumps, hydraulic motors, hydraulic circuits

Description

Driving apparatus for industrial pumps

Fluid generally flows from high to low, but sometimes it needs to be transferred from low to high and sometimes at high pressure. In this case, it is impossible without supplying energy to the fluid, so the fluid (liquid, gas) is used as an operating material by the electric motor to convert the energy of the fluid into mechanical energy or the mechanical energy into fluid energy. Energy is transferred to the high place by energizing energy exchange to drive electrical energy into mechanical energy and to transfer mechanical energy to the fluid.

When a fluid machine is classified by a working fluid, it can be classified into a hydraulic machine and an air machine. As a representative type of a hydraulic machine, one type of fluid machine is a pump.

The pump was first used in coal mine drainage, marine use, and is now widely used in various industries such as building, water supply, sewerage, drainage, agricultural irrigation, industrial water, power plants, and various plants. have.

Industrial pumps are widely used in heavy chemical fields such as chemical plants and industrial machinery, as well as in agriculture and other industries.

Industrial pumps are classified into turbo type, volume type and special type when they are classified according to the principle of operation. The turbo type is a method of directly controlling the flow with an impeller, and the volume type is a method in which energy is transferred by volume change while the fluid is completely trapped in a chamber or a flow path. In addition, a pump whose operating principle is not a turbo type or a volume type is called a special type.

Depending on the geometry of the flow path, the turbopump is divided into centrifugal, quadruple and axial flows. Centrifugal and quadruple pumps are structurally divided into a flute pump with guide vanes and a diffuser pump without guide vanes. They are also divided into single stage pump and multiple stage pump according to the number of stages, and single stage pump and multiple stage pump are classified into one suction type and both suction type according to the suction method.

It is desirable to have a pump that is used for such an industrial purpose and has a system for operating the pump of the direct type in consideration of safety and economic efficiency.

Industrial high pressure pumps, which are mainly used in large industrial facilities, use pumps equipped with hundreds of horsepower large-capacity electric motors.

However, due to the installation costs and maintenance costs, enormous expenses are required. In addition, since the use of high-pressure electricity, there is also a problem that the cost is enormously expensive.

In addition, since water is drained by using high pressure electricity, electric safety accidents such as an electric shock or a failure of a motor due to leakage occur frequently.

The present invention has been made to improve the above problems, and the object of the present invention is to provide a driving apparatus for an industrial pump that can reduce the maintenance costs such as initial facility costs and electricity costs by operating the pump using a low voltage motor. have.

Another object of the present invention is to provide a drive device for an industrial pump that can prevent the electrical safety accident in advance because it does not use a high voltage electricity by using a low-voltage motor.

Driving apparatus for an industrial pump of the present invention for achieving the above object is a pump for transferring a fluid by the rotation of the impeller; A hydraulic motor connected to the rotating shaft of the impeller to rotate the impeller; And hydraulic driving means for driving the hydraulic motor.

The hydraulic driving means is connected by the hydraulic motor and the first connection pipe for transferring the hydraulic oil to a constant pressure, an electric motor for driving the hydraulic pump, supplying the hydraulic oil to the hydraulic pump and supplying the hydraulic motor And an oil tank for storing hydraulic oil discharged from the second connecting pipe through the pipe.

It is characterized in that it is provided between the hydraulic motor and the pump further comprises a transmission for changing the rotational speed of the impeller.

The electric motor is characterized in that the low voltage motor driven by a voltage of 380V.

As described above, according to the driving apparatus of the industrial pump of the present invention, by operating the pump using a low pressure motor, the initial facility cost and the maintenance cost can be greatly reduced.

In addition, by configuring the hydraulic circuit to operate the pump, the design is free, and electric safety accidents such as electric shocks and motor failure due to leakage can be prevented in advance.

Hereinafter, a driving apparatus of an industrial pump according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

Referring to FIG. 1, the driving apparatus of the industrial pump of the present invention is connected to a pump 20 for transferring fluid by large rotation of the impeller 23 and a rotating shaft of the impeller 23 to rotate the impeller 23. Hydraulic motor 40 for, and hydraulic drive means 30 for driving the hydraulic motor 40.

Here, the industrial pump means a pump used to transfer fluids in various industrial fields such as building, water supply, sewerage, drainage, agricultural irrigation, industrial water, power plants, and various plants.

In addition, the industrial pump applied to the present invention imparts energy to the fluid by rotating the impeller in the housing, and is divided into centrifugal, quadruple, and axial flow according to the geometry of the flow path. Centrifugal and quadruple pumps are structurally divided into a flute pump with guide vanes and a diffuser pump without guide vanes. They are also divided into single stage pump and multiple stage pump according to the number of stages, and single stage pump and multiple stage pump are classified into one suction type and both suction type according to the suction method.

The industrial pump 20 used in the driving apparatus according to the embodiment of the present invention transfers the fluid by rotating the impeller 23 by the hydraulic motor 40.

And the hydraulic motor 40 is driven by the hydraulic drive means (30).

The hydraulic driving means 30 transfers the hydraulic oil to the hydraulic motor 40 at a constant pressure to drive a hydraulic pump 70 for driving the hydraulic motor 40 and an electric motor 80 for driving the hydraulic pump 70. Equipped.

The hydraulic motor 40 is to generate rotational energy by the hydraulic oil of a constant pressure is connected to the rotating shaft of the impeller 23 to rotate the impeller 23. And a transmission 35 for changing the rotation speed of the impeller 23 is installed between the hydraulic motor 40 and the pump 20.

The hydraulic motor is connected to the hydraulic pump 70 by the first connecting pipe 50.

The hydraulic pump 70 receives hydraulic oil from the oil tank 100 and applies a constant pressure to the hydraulic oil by the electric motor 80 to pump the hydraulic motor 40. In this case, the electric motor 80 uses a low voltage of 380V.

Preferably, an electric motor 80 having an output of 75 kW of 380 V is used. In addition, during a power failure, the prime mover may be used to drive the hydraulic pump.

The hydraulic oil pumped from the hydraulic pump 70 as described above is supplied to the hydraulic motor 40 through the first connecting pipe 50 at a constant pressure and flow rate. Pressure of the hydraulic oil pumped from the hydraulic pump 70 according to an embodiment of the present invention is 204kg / cm ² The supply flow rate is 225000 cm ³ / min.

The hydraulic oil driving the hydraulic motor 40 is discharged to the oil tank 100 through the second connecting pipe 60.

The accumulator 90 is installed in the first connection pipe 50 to replenish the pressure oil when the pressure of the hydraulic oil pumped from the hydraulic pump 70 falls below a predetermined pressure, or to absorb the pressure when the pressure occurs above the predetermined pressure. Play a role. The pressure gauge 95 may be further installed on the first connection pipe 50.

In addition, a six-port three-position directional valve 53 is installed between the first connecting pipe 50 and the second connecting pipe 60 to switch the flow path of the working oil. Four ports may be used as the direction switching valve 53.

When the hydraulic motor 40 is operated, the directional valve 53 supplies hydraulic oil to the hydraulic motor 40 from the first connecting pipe 50, and the hydraulic pump 70 when the hydraulic motor 40 is not operated. The hydraulic oil pumped from) is returned to the oil tank 100 so that the hydraulic motor 40 is not loaded.

The relief valve 55 is installed in the first connection pipe 50 between the hydraulic pump 70 and the direction change valve 53 so that the hydraulic tank 100 through the second connection pipe 60 when the hydraulic fluid is above a predetermined pressure. To be returned). Although not shown, a check valve may be further installed in the first connection pipe 50 between the hydraulic pump 70 and the relief valve 55.

When using an electric motor having an output of 75 kW of 380 V according to an embodiment of the present invention, the output of the hydraulic motor 40 having a capacity of 150 cc / rev is calculated in the following manner, and the torque is 4872.6 kg _f ㆍ cm, rotation. The number is 1500 rpm (assuming no energy loss).

Hydraulic motor torque Mth = (P × α) / 2π, kg _f ㆍ cm

Where P is the hydraulic oil pressure and α is the capacity of the hydraulic motor.

Hydraulic motor speed nth = Q / α, rpm

Where Q is the flow rate of the hydraulic oil and α is the capacity of the hydraulic motor.

Hydraulic motor output Nath = (2π × nth × Mth) / (612 × 1000), kW

As described above, the output of the hydraulic motor 40 is 75 kW when the torque 4872.6kg _f ㆍ cm, the rotation speed 1500rpm.

The hydraulic motor 40 may be connected to the transmission 35 to change the rotation ratio. The transmission 35 uses a reduction gear having a reduction ratio of 5: 1. Therefore, the impeller rotation speed of the pump 20 is finally 300 rpm, and the torque is 24363 rpm.

With the above configuration, not only the large torque can be used by using the low-pressure motor 80, but also the management cost such as initial facility cost or expensive electric bill due to high pressure can be greatly reduced.

The hydraulic oil supplied to the hydraulic motor 40 is sent back to the oil tank 100 through the second connecting pipe 60. In this case, a check valve 67 is installed in the second connecting pipe 60 between the hydraulic motor 40 and the direction change valve 53. And the second connection pipe 60 on the oil tank 100 side is provided with a filter 63 to filter foreign matter in the working oil.

In addition, when the hydraulic motor 40 is not operated, a third connecting pipe 65 connected to the oil tank 100 to function as a bypass passage is further installed to prevent the load from being applied.

On the other hand, since the length of the first, second and third connecting pipes 50, 60, 65 can be freely designed, the pump 20 and the electric motor 80 are adjusted to be spaced at a suitable distance. In addition, by configuring a hydraulic circuit between the pump 20 and the electric motor 80 to drive the pump 20, an electric safety accident such as an electric shock or a failure of the motor 80 due to leakage can be prevented.

The oil tank 100 is to store the working oil, the power loss in the hydraulic circuit is converted into heat to increase the temperature of the working oil to use a sufficient size to dissipate heat through the wall of the oil tank (100). In order to remove water or sediment remaining in the oil tank 100, the bottom is preferably formed to have an appropriate inclination and the drain is preferably installed at the bottom.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments thereof are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is a block diagram of a driving device for driving an industrial pump according to an embodiment of the present invention.

20: pump 35: transmission

40: hydraulic motor 50: first connector

53: directional valve 60: second connecting pipe

70: hydraulic pump 80: electric motor

Claims

A pump for transferring fluid by rotation of the impeller;

A hydraulic motor connected to the rotating shaft of the impeller to rotate the impeller;

And a hydraulic driving means for driving the hydraulic motor.

According to claim 1, wherein the hydraulic drive means is connected to the hydraulic motor and the first connecting pipe and the hydraulic pump for transferring the hydraulic fluid at a constant pressure,

An electric motor for driving the hydraulic pump,

And an oil tank for supplying hydraulic oil to the hydraulic pump and storing hydraulic oil discharged from the hydraulic motor through the second connecting pipe.

3. The driving apparatus of claim 2, further comprising a transmission installed between the hydraulic motor and the pump to change the rotation speed of the impeller.