KR101873321B1 - Apparatus for protecting submerged motor - Google Patents

Apparatus for protecting submerged motor Download PDF

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Publication number
KR101873321B1
KR101873321B1 KR1020180044020A KR20180044020A KR101873321B1 KR 101873321 B1 KR101873321 B1 KR 101873321B1 KR 1020180044020 A KR1020180044020 A KR 1020180044020A KR 20180044020 A KR20180044020 A KR 20180044020A KR 101873321 B1 KR101873321 B1 KR 101873321B1
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KR
South Korea
Prior art keywords
gas
underwater
motor
underwater motor
gas pipe
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Application number
KR1020180044020A
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Korean (ko)
Inventor
이승철
전현철
정재은
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이승철
전현철
정재은
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Application filed by 이승철, 전현철, 정재은 filed Critical 이승철
Priority to KR1020180044020A priority Critical patent/KR101873321B1/en
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Publication of KR101873321B1 publication Critical patent/KR101873321B1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/132—Submersible electric motors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention discloses a submersible motor protecting apparatus which includes an underwater cable including a first gas tube for providing an injection path of inert gas into a submersible motor and a second gas tube for providing a discharge path of moisture and gas from the inside of the submersible motor, and a gas control unit for injecting the inert gas to the first gas tube and controlling the pressure of discharge gas which is discharged from the second gas tube. Accordingly, the present invention can prevent damage to or malfunction in the submersible motor.

Description

[0001] APPARATUS FOR PROTECTING SUBMERGED MOTOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater motor protection device, and more particularly, to a technique for protecting an underwater motor by providing dew condensation prevention and moisture discharge inside an underwater motor through an underwater cable.

The conventional submersible motor pump includes an underwater pump that generates power through a rotary shaft and an underwater pump that includes an impeller that receives the power of the rotary shaft to flow the fluid.

Conventional submersible motors generate heat in the inside when driving, resulting in the formation of high temperature and high humidity air inside, and increase the internal air pressure due to temperature. , Condensation is generated while cooling, and leakage or flooding is promoted by a vacuum phenomenon. In addition, conventional underwater motors have problems in that dew condensation, water leakage, or flooding are promoted, and internal components are damaged or malfunctions may occur.

Conventional submersible motors have internal conductors and insulators. When an overload occurs, the conductors can be deteriorated. Since the insulators can be thermally deformed or burnt, the internal parts are damaged due to overload and can not be driven or malfunctioned There is a problem.

In Patent Document 1, when the driving of an underwater motor pump is stopped, a condensation prevention unit composed of a dehumidifying tube composed of a heater and a desiccant which receives electricity in the underwater motor to dissipate heat and suppresses condensation inside the underwater motor.

However, in Patent Document 1, since the underwater motor is operated in a state of being immersed in water, only the moisture absorption and heater heating are repeated without moisture release in the underwater motor in which the dehumidifying tube made of the desiccant is hermetically sealed, The parts of the underwater motor and the heater can be corroded by the underwater motor and the parts of the heater can be damaged due to corrosion and can not be driven or malfunction. There is a problem that the maintenance cost of the battery is excessively increased.

In Patent Document 2, a sensor is installed in an empty space inside a motor in a submersible motor pump to detect the state of the motor, and to prevent overload of the motor by sensing the state of the motor.

However, in Patent Document 2, due to moisture and heat of an underwater motor, the life of the sensor may be shortened or a malfunction of the sensor may occur, and the original detection purpose can not be achieved due to malfunction of the sensor. In addition, Patent Document 2 has a problem that the installation cost of the sensor and the maintenance cost such as disassembling of the underwater motor for replacement in case of sensor abnormality occur excessively, and the sensor as the electronic component may malfunction due to condensation in the underwater motor.

1. Korean Patent No. 10-1185116 2. Korean Registered Utility Model No. 20-0409016

In order to solve the above problems, the present invention provides an underwater motor protection device for injecting an inert gas into a first gas pipe and controlling the pressure of an exhaust gas discharged from a second gas pipe to prevent condensation inside the underwater motor and to provide moisture discharge. do.

The present invention provides an underwater motor protection device for monitoring the state of an underwater motor by analyzing the exhaust gas discharged from the second gas pipe.

The present invention provides an underwater motor protection device comprising an underwater cable formed with a power supply line, a first gas pipe and a second gas pipe.

According to an embodiment of the present invention, there is provided an underwater motor protection device comprising a first gas pipe for providing an inert gas injection path into an underwater motor and a discharge path for moisture and gas inside the underwater motor And a gas control unit for injecting an inert gas into the first gas pipe and controlling a pressure of the exhaust gas discharged from the second gas pipe, thereby preventing condensation inside the underwater motor and preventing moisture To protect the underwater motor.

The underwater cable may further include a power supply line for supplying electric power to the underwater motor and an envelope tube enclosing the first gas pipe, the second gas pipe, and the power supply line together.

The cross section of the envelope tube may be characterized in that the diameter of each gas pipe and the supply line is the same and the corners are rounded rectangles.

The underwater motor protection device of the present invention may further include a power control unit for controlling the driving of the underwater motor by supplying electricity of the underwater motor to the power supply line.

The power control unit controls the rotating direction of the rotating shaft so that the suspended sludge floating around the underwater motor or the floating sludge suspended in the submerged pump, which receives the rotating shaft power of the submerged motor, is rotated forward, . ≪ / RTI >

The gas control unit mixes the air to inject the inert gas into the first gas pipe, removes the moisture of the discharged gas and reuses the gas as the injection gas of the first gas pipe, and controls the preliminary gas reservoir And injecting the inert gas into the first gas pipe.

The underwater motor protecting apparatus of the present invention may further include a gas analyzer for analyzing the exhaust gas to monitor the state of the underwater motor.

The underwater cable provides a path for circulating air to the inside and the outside of the underwater motor and mitigates the shrinkage due to expansion and cooling due to the temperature rise of the underwater motor by air circulation to reduce the pressure difference between the inside and the outside of the underwater motor . ≪ / RTI >

The present invention provides a submerged motor protection device for preventing condensation inside the submersible motor and for discharging moisture, thereby preventing damage or malfunction of the submersible motor and prolonging the life of the submersible motor.

The present invention monitors the state of the underwater motor by analyzing the gas discharged from the second gas pipe, thereby eliminating the need for a separate sensor for monitoring the state inside the underwater motor, reducing the installation cost of the sensor, It is possible to prevent the condensation of the underwater motor and to provide an external discharge of moisture while at the same time detecting the abnormality of the underwater motor and prolonging the life of the underwater motor.

The present invention provides an underwater cable formed together with a power supply line, a first gas pipe, and a second gas pipe, so that each gas pipe and the supply line can be integrally managed together, and each gas pipe and the supply line can be connected to an underwater motor have.

1 shows an underwater motor protection device according to an embodiment of the present invention.
2 shows an underwater motor pump according to an embodiment of the present invention.
Fig. 3 shows an example in which the underwater motor protecting device of Fig. 1 and the underwater motor pump of Fig. 2 are connected.
Fig. 4 is an example showing in detail a cross section of the underwater cable of Fig. 1;
Fig. 5 is an example showing that the discharging portion of Fig. 2 is lowered.
6 is an example showing that the discharge portion of Fig. 2 is lifted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

FIG. 1 shows a submerged motor protection apparatus according to an embodiment of the present invention. FIG. 2 shows an underwater motor pump according to an embodiment of the present invention. FIG. 3 shows an underwater motor protection apparatus of FIG. Of an underwater motor pump is connected.

The submersible motor pump 200 includes an underwater motor 210 that receives electricity and generates power, an underwater pump 220 that has an impeller (not shown) that receives the power to flow the fluid, an underwater motor 210, And a discharge part 230 for lifting the pump 220.

The underwater motor protection device 100 protects the underwater motor 210 by providing dew condensation prevention and moisture discharge inside the underwater motor 210. The submersible motor pump 200 is disposed in a duct or a duct and the submersible motor protecting apparatus 100 is disposed at a position spaced apart from the switchboard 10 or the duct by a predetermined distance. The underwater motor protecting apparatus 100 includes an underwater cable 110 and the underwater cable 110 is connected to the underwater motor 210 for preventing condensation and moisture discharge inside the underwater motor 210.

FIG. 4 is a detailed cross-sectional view of the underwater cable of FIG. 1. The underwater cable 110 includes a first gas pipe 111 for providing an inert gas injection path into the underwater motor 210, And a second gas pipe 112 for providing the discharge path of the moisture and gas of the gas.

The underwater cable 110 further includes a power supply line 113 for supplying electric power to the underwater motor and the first gas pipe 111, the second gas pipe 112 and the power supply line 113 are directly integrated, And an outer tube 114 surrounding the outer tube 114. The power supply line 113 is a three-phase four-wire type comprising an R phase 113a, an S phase 113b, a T phase 113c, and a ground 113d. The cross section of the outer tube 114 may be a rectangle having rounded corners with the same diameter of each gas pipe and supply line.

The present invention provides an underwater cable 110 formed together with the electric power supply line 113, the first gas pipe 111 and the second gas pipe 112 to integrally manage each gas pipe and the supply line, And the supply line can be connected to the underwater motor 210 formed in the water. The present invention is also applicable to an underwater motor 210 in which the flexibility of the cable is improved and the underwater motor 210 is lifted by the cable 110 having a flat cross section such as a rectangle having the same diameter and the same diameter as each gas pipe and supply line, As a cable to be connected to the cable (110).

The underwater motor protecting apparatus 100 of the present invention may further include at least one of a power control unit 120, a gas analysis unit 140, and a branching unit 150.

The power control unit 120 supplies electric power of the submersible motor 210 to the power supply line 113 to control the driving of the submersible motor 210. The power control unit 120 controls the operation of the submersible pump 220 and the submergence of the submerged pump 210 in the vicinity of the submerged motor 210, The rotating direction of the rotating shaft can be controlled so that suspended sludge suspended in the rotating shaft can be removed. The electric power control unit 120 can control the electric supply so that the normal rotation, the stop and the reverse rotation operation of the submersible motor 210 are repeated a predetermined number of times in order to discharge the impurities or sludge. When discharging impurities or sludge, all valves for controlling the fluid in the pipeline must be open.

The present invention can flood the sludge around the submersible pump 220 and the submersible motor 210 by using the water pressure in the pipeline if the fluid flowing in the pipeline is reversed while the valve is opened, Once started, contaminants and sludge can be drained out together with the fluid.

The gas control unit 130 is connected to the first gas pipe 111 to inject inert gas and is connected to the second gas pipe 112 to supply the pressure of the exhaust gas including moisture and gas discharged from the second gas pipe 112 . The gas control unit 130 can increase the pressure inside the submersible motor 210 by regulating the pressure of the exhaust gas and increase the pressure inside the submersible motor 210 to prevent flooding or leakage.

When the internal pressure of the submersible motor 210 is low, the gas control unit 130 can infiltrate the fluid outside the submersible motor 210. If the internal pressure is high, the infiltration of the fluid is suppressed, The pressure of the exhaust gas can be controlled to be equal to or higher than the external pressure of the underwater motor 210. [ For example, the gas control unit 130 injects inert gas into the first gas pipe 111 at a predetermined pressure higher than the atmospheric pressure, and supplies the inert gas to the second gas pipe 112 at a predetermined pressure lower than the pressure of the first gas pipe 111 It is possible to maintain the pressure inside the submersible motor 210 by controlling the pressure of the discharged exhaust gas, and to suppress flooding or leakage of water into the submersible motor 210 by controlling the pressure.

The inert gas may be nitrogen gas. Nitrogen gas has a function of preventing oxidation corrosion, circulating air inside the submersible motor 210, and circulating air to remove moisture.

The present invention provides air circulation to the outside through an underwater cable 110 including a first gas pipe 111 and a second gas pipe 112 so that expansion due to the temperature rise of the submersible motor 210 and shrinkage due to cooling So that flooding and leakage of water can be suppressed naturally.

The gas control unit 130 mixes the air to inject the inert gas into the first gas pipe 111, removes the moisture of the discharged gas and reuses it as the injection gas of the first gas pipe 111, and generates a preliminary inert gas The preliminary inert gas can be injected into the first gas pipe 111 only by the pressure of the preliminary gas reservoir (not shown) to be stored.

The present invention can reduce the amount of nitrogen gas used by injecting nitrogen gas mixed with air into the first gas pipe 111 and can reduce the maintenance cost by reusing the discharged nitrogen gas, A stable supply of nitrogen gas can be provided.

The branching part 150 is connected to one end of the underwater cable 110 and the power supply line 113 is connected to the power control part 120. The first gas pipe 111 and the second gas pipe 112 are connected to the gas control part 130 ).

The gas analyzer 140 analyzes the state of the underwater motor 210 by analyzing the exhaust gas. The gas analyzing unit 140 can analyze the possibility of flooding due to the poor sealing of the underwater motor 210 by integrating the amount of gas to be injected and the amount of exhaust gas, The oxidation state can be analyzed.

The gas analyzer 140 includes a gas sensor (not shown) that senses one or more of hydrogen gas generated in the conductor and benzene gas or toluene gas generated in the insulator, and detects the insulation, deterioration, or oxidation state of the submersible motor 210 Can be analyzed. For example, copper, which is a conductor included in the underwater motor 210, can be deteriorated due to the concentration of electric power at a specific portion, resulting in a conductor incomplete state, and hydrogen gas and carbon gas are generated at the time of deterioration. The gas analyzer 140 detects only the hydrogen gas generated in the conductor since the carbon gas changes to solid over time.

The gas analyzer 210 may be installed inside the switchboard 10 to sense the gas inside the switchboard 10. The gas analyzer 210 can sense the gas inside the switchboard 10 and monitor the state of the underwater motor 210 as well as detect fire signs or fire incidents inside the switchboard 10, The manufacturing cost can be reduced by reducing the number of parts of the sensor.

2 is an example in which the discharging portion of FIG. 2 is lowered, FIG. 6 is an illustration showing that the discharging portion of FIG. 2 is lifted, and the discharging portion 230 includes a connecting portion A discharge port 233 for discharging the fluid and a multistage pipe 232 disposed between the connection portion 231 and the discharge port 233 to provide a fluid path for the fluid to be expanded and contracted.

The multi-stage pipe 232 includes a plurality of pipes, a plurality of pipes are formed in multiple stages, and the upper pipe is larger in diameter than the lower pipe. In the present invention, since the upper pipe is larger in diameter than the lower pipe, there is no load due to the bottleneck in the drain water, and the fluid injected in the gap between the neighboring pipes can be directed only to the lower part.

The discharge unit 230 blocks the rotational movement of the underwater motor 210 or the underwater pump 220 through the rectangular or circular multi-stage pipe 232 rather than the circular discharge pipe, and the multi- Or a straight line motion or a diagonal motion of the robot. The discharge portion 230 may further include a lifting rope (not shown) or a chain block (not shown). The lifting rope or chain block is formed in the upper center of the submersible motor 210 and the submerged pump 220 to lift the submersible motor 210 and the submerged pump 220 and to provide extension and retraction of the multi-

The discharging portion 230 may further include a lifting portion (not shown) including a concave / convex portion (not shown), a rack gear (not shown) and a rack guide (not shown). The concavo-convex portion is formed in the discharge portion 233 and is processed into a concave-convex shape to increase the contact surface, thereby preventing the underwater motor 210 from moving left and right. The rack gear is fixed to the underwater motor 210 side, and a rack guide is provided on the upper side. The discharging unit 230 can lift the underwater motor 210 and the underwater pump 220 through the rack gear and the rack guide.

100: Underwater motor protection device 110: Underwater cable
120: power control unit 130: gas control unit
140: gas analysis unit 150:
200: Underwater motor pump 210: Underwater motor
220: Submersible pump 230:

Claims (8)

An underwater cable including a first gas pipe for providing an inert gas injection path into the underwater motor and a second gas pipe for providing a discharge path of moisture and gas inside the underwater motor,
And a gas control unit for injecting an inert gas into the first gas pipe and controlling a pressure of the exhaust gas discharged from the second gas pipe,
Wherein the underwater motor is protected by providing dew condensation prevention and moisture discharge inside the underwater motor. The method according to claim 1,
The underwater cable,
A power supply line for supplying electric power to the underwater motor; and
Further comprising an outer pipe enclosing the first gas pipe, the second gas pipe, and the power supply line together. 3. The method of claim 2,
Wherein the cross section of the outer tube is a rectangle having rounded corners with the same diameter of each gas pipe and supply line. 3. The method of claim 2,
Further comprising a power controller for controlling the operation of the submersible motor by supplying electricity from the submersible motor to the power supply line. 5. The method of claim 4,
The power control unit controls the rotating direction of the rotating shaft so that the suspended sludge floating around the underwater motor or the floating sludge suspended in the submerged pump, which receives the rotating shaft power of the submerged motor, is rotated forward, Wherein the underwater motor protection device comprises: The method according to claim 1,
The gas control unit mixes the air to inject the inert gas into the first gas pipe, removes the moisture of the discharged gas and reuses the gas as the injection gas of the first gas pipe, and controls the preliminary gas reservoir Wherein the inert gas is injected into the first gas pipe. The method according to claim 1,
Further comprising: a gas analyzer for analyzing the exhaust gas to monitor the state of the underwater motor. The method according to claim 1,
The underwater cable provides a path for circulating air to the inside and the outside of the underwater motor and mitigates the shrinkage due to expansion and cooling due to the temperature rise of the underwater motor by air circulation to reduce the pressure difference between the inside and the outside of the underwater motor Wherein the underwater motor protection device comprises:
KR1020180044020A 2018-04-16 2018-04-16 Apparatus for protecting submerged motor KR101873321B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102026289B1 (en) 2019-03-06 2019-09-30 (주)아이오텍 Pump-integrated underwater motor and pump-integrated underwater motor controller operated by wireless power
KR102162178B1 (en) 2020-03-26 2020-10-06 더블유에스테크주식회사 Apparatus for monitoring motor and distribution board

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003090295A (en) 2001-09-18 2003-03-28 Tsurumi Mfg Co Ltd Submergible motor condensation preventive structure
JP2005020814A (en) 2003-06-23 2005-01-20 Ebara Corp Dew condensation preventing arrangement
KR101185116B1 (en) 2012-03-28 2012-09-21 이응수 Water pump with dehumidification function

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003090295A (en) 2001-09-18 2003-03-28 Tsurumi Mfg Co Ltd Submergible motor condensation preventive structure
JP2005020814A (en) 2003-06-23 2005-01-20 Ebara Corp Dew condensation preventing arrangement
KR101185116B1 (en) 2012-03-28 2012-09-21 이응수 Water pump with dehumidification function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102026289B1 (en) 2019-03-06 2019-09-30 (주)아이오텍 Pump-integrated underwater motor and pump-integrated underwater motor controller operated by wireless power
KR102162178B1 (en) 2020-03-26 2020-10-06 더블유에스테크주식회사 Apparatus for monitoring motor and distribution board

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