JP2017031951A - Submerged electrically driven pump - Google Patents

Abstract

A submersible electric pump capable of easily performing maintenance is provided.
This submersible electric pump 100 is disposed between a motor 1 for rotating a rotating shaft 2, a pump chamber 4 in which an impeller 3 driven by the motor 1 is disposed, and the motor 1 and the pump chamber 4. And a first fluid pressurizing unit that is disposed below the oil chamber 5 and applies pressure in the opposite direction to the oil chamber 5 to the water in the pump chamber 4 by the rotation of the rotating shaft 2. 90.
[Selection] Figure 1

Description

  The present invention relates to a submersible electric pump.

  Conventionally, a small submersible electric pump including an oil chamber in which a mechanical seal is provided between the pump chamber and the motor is known so that the pressure water in the pump chamber does not enter the motor. However, this submersible electric pump has a disadvantage that pressure water, oil, or the like entering the oil chamber from the sliding portion may flow into the motor due to wear or surface roughness of the sliding portion of the mechanical seal.

  Therefore, in order to prevent pressure water, oil, etc. from flowing into the motor, a submersible pump that shuts off the power supply to the motor by installing a submersion detection sensor in the oil chamber and detecting the submersion in the oil chamber. (Submersible electric pump) has been proposed (see, for example, Patent Document 1). In addition, a water immersion chamber is further provided between the oil chamber and the motor chamber so that the pressure water in the pump chamber and the oil in the oil chamber do not enter the motor. In addition, a submersible pump (submersible electric pump) having a configuration that ensures a long time until the power supply to the motor is cut off has been proposed (see, for example, Patent Document 2).

JP 2002-310091 A JP 2007-332825 A

  However, in the submersible pump (submersible electric pump) of the above-mentioned Patent Document 1, when the pressure water in the pump chamber is submerged in the oil chamber, the submersible pump is forcibly stopped and pulled up from the water, and the pump casing or the oil casing It is necessary to recover after performing maintenance work. In this case, in order to continue the operation, it is necessary to have a spare submersible pump and take emergency measures with the spare submersible pump. For this reason, there is a problem that a lot of labor is required for maintenance.

  Also, in the submersible pump (submersible electric pump) of Patent Document 2, when the pressure water in the pump chamber is submerged in the oil chamber, the submersible pump is forcibly stopped in the same manner as in Patent Document 1 above. The pump casing, the oil casing, and the like are removed, and maintenance work is performed, and then it is necessary to restore. In this case, in order to continue the operation, as in the case of Patent Document 1, it is necessary to make an emergency response with a spare submersible pump, and thus there is a problem that much labor is required for maintenance.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a submersible electric pump that can be easily maintained.

  The submersible electric pump according to one aspect of the present invention includes a motor that rotates a rotating shaft, a pump chamber in which an impeller driven by the motor is disposed, an oil chamber that is disposed between the motor and the pump chamber, A first fluid pressurizing unit that is disposed below the oil chamber and applies pressure to the water in the pump chamber in a direction opposite to the oil chamber by rotating the rotation shaft;

  In the submersible electric pump according to one aspect of the present invention, as described above, the submersible electric pump is disposed below the oil chamber, and the rotating shaft rotates to apply pressure to the water in the pump chamber in the direction opposite to the oil chamber. 1 fluid pressurizing part is provided. Thereby, it is possible to suppress the pressure water in the pump chamber from entering the oil chamber. As a result, it is not necessary to forcibly stop the submersible pump and lift it out of the water, remove the pump casing, the oil casing, etc., perform the maintenance work, and restore it. Further, it is not necessary to have a spare submersible electric pump in order to continue operation. As a result, maintenance and management of the submersible electric pump can be easily performed without requiring much labor and cost for maintenance.

  In the submersible electric pump according to the above aspect, preferably, the first fluid pressurizing part is formed by at least one of a groove part or a convex part inclined with respect to a horizontal plane. With this configuration, the pressure fluid in the pump chamber can be pressurized in the opposite direction to the oil chamber by the first fluid pressurizing unit having a simple structure, so that the pressure water in the pump chamber can enter the oil chamber. It can be easily suppressed.

  In the submersible electric pump according to the above aspect, the impeller is preferably provided on the rotating shaft, and the first fluid pressurizing unit is disposed at a height position between the impeller and the oil chamber. If comprised in this way, the pressure water of a pump chamber can be pressurized in the direction opposite to an oil chamber in the area | region between an impeller and an oil chamber in a pump chamber. Thereby, it is possible to efficiently suppress the pressure water in the pump chamber from entering the oil chamber.

  In the submersible electric pump according to the above aspect, it is preferable that the submersible electric pump further includes a cylindrical pressurizing member that is attached to the rotating shaft at a position below the oil chamber and rotates together with the rotating shaft. It is provided in the outer peripheral part of the pressure member. If comprised in this way, a 1st fluid pressurization part can be easily provided in the existing submersible electric pump by mounting | wearing the rotating shaft with the cylindrical pressurization member provided with the 1st fluid pressurization part. it can. Moreover, a new 1st fluid pressurization part can be easily provided in a submersible electric pump by replacing | exchanging a cylindrical pressurization member.

  The submersible electric pump according to the above aspect preferably further includes a second fluid pressurizing unit that applies pressure to the oil chamber side with respect to oil or a mixed fluid of oil and water by rotating together with the rotating shaft. . With this configuration, it is possible to apply downward pressure to the oil that is about to flow into the upper part of the oil chamber or the mixed fluid of oil and water, so that the oil rising from the oil chamber can be suppressed. it can.

  In this case, it is preferable to further include a fluid return path that communicates the second fluid pressurizing unit and the oil chamber. With this configuration, it is possible to apply pressure to the oil flowing into the upper part of the oil chamber or the mixed fluid of oil and water and guide it to the fluid return path. The inflowing oil or the mixed fluid of oil and water can be returned to the oil chamber.

  In the configuration including the second fluid pressurizing unit, preferably, the first fluid pressurizing unit and the second fluid pressurizing unit are each inclined with respect to the horizontal plane and the horizontal plane of the first fluid pressurizing unit is set. The inclination angle is formed to be larger than the inclination angle of the second fluid pressurizing part with respect to the horizontal plane. If comprised in this way, since the 1st fluid pressurization part which can apply a pressure stronger than a 2nd fluid pressurization part with respect to a fluid can apply a strong pressure with respect to the pressure water of a pump chamber. The pressure water in the pump chamber can be effectively pressurized in the opposite direction to the oil chamber. In addition, oil having a greater resistance than water or a mixed fluid of oil and water is returned to the oil chamber side by the second fluid pressurizing unit that can apply a pressure smaller than that of the first fluid pressurizing unit to the fluid. However, it can suppress that the rotational force of the rotating shaft of a submersible electric pump is impaired greatly.

  In the configuration including the second fluid pressurizing unit, it is preferable to further include an oil ascending channel for communicating the second fluid pressurizing unit and the motor. With this configuration, even when oil or a mixed fluid of oil and water flows out (leaks out) above the oil chamber, the oil or the mixed fluid of oil and water flows into the oil ascending flow path. Since it can escape, it can suppress that oil or the fluid mixture of oil and water contacts a motor bearing and a power part directly.

  In the submersible electric pump according to the above aspect, a fluid storage section is preferably provided in a lower portion inside the motor. With this configuration, even when oil or a mixed fluid of oil and water flows out above the oil chamber, the oil or a mixed fluid of oil and water can be stored in the fluid storage section. Therefore, it is possible to effectively suppress the oil or the mixed fluid of oil and water from directly contacting the motor bearing and the power unit.

  In this case, preferably, an inundation detection unit is disposed in the fluid storage unit. With this configuration, the operation of the submersible electric pump can be urgently stopped when water enters the fluid reservoir, so that the fluid that has flowed out above the oil chamber can be prevented from reaching the motor. .

  ADVANTAGE OF THE INVENTION According to this invention, as mentioned above, the submersible electric pump which can perform maintenance management easily can be provided.

It is the schematic which showed the submersible electric pump by 1st Embodiment of this invention. It is the enlarged view which showed typically the 1st fluid pressurization part by 1st Embodiment of this invention. It is the schematic which showed the submersible electric pump by 2nd Embodiment of this invention. It is the top view which showed the impeller by 2nd Embodiment of this invention. It is the enlarged view which showed typically the 2nd fluid pressurization part by 2nd Embodiment of this invention. It is the schematic which showed the submersible electric pump by 3rd Embodiment of this invention. It is the schematic which showed the submersible electric pump by 4th Embodiment of this invention. It is the schematic which showed the submersible electric pump by 5th Embodiment of this invention. It is the schematic diagram which showed the 1st modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 2nd modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 3rd modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 4th modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 5th modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 6th modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 7th modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the schematic diagram which showed the 8th modification of the 1st fluid pressurization part of 3rd Embodiment of this invention. It is the schematic diagram which showed the 9th modification of the 1st fluid pressurization part of 4th Embodiment of this invention. It is the schematic diagram which showed the 10th modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is sectional drawing of the 1st fluid pressurization part of the 10th modification of the 1st fluid pressurization part of 1st Embodiment of this invention. It is the side view which showed the modification of the impeller of 1st Embodiment of this invention. It is the top view which showed the modification of the impeller of 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Configuration of submersible electric pump)
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The submersible electric pump 100 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and a mechanical seal 6 having sliding portions 6a and 6b. The submersible electric pump 100 includes an annular body 7, an annular space portion 8, and a cylindrical pressure member 9. The submersible electric pump 100 is a vertical submersible electric pump in which the rotating shaft 2 extends in the vertical direction.

  The motor 1 includes a stator 1a and a rotor 1b. The motor 1 is sealed so that water from the outside does not enter. The motor 1 is configured to rotationally drive the impeller 3 (rotary shaft 2).

  The stator 1a has a coil. The stator 1 a is disposed on the outer periphery of the motor 1. When electric power is supplied from the cable 1c to the coil of the stator 1a, the stator 1a is configured to generate a magnetic field. Moreover, the rotor 1b is arrange | positioned inside the motor 1 so that the stator 1a may be opposed. The rotor 1 b is attached to the rotating shaft 2. The rotor 1b is configured to rotate by a magnetic field from the stator 1a.

  The rotating shaft 2 is configured to rotate by driving the motor 1. The rotating shaft 2 is configured to rotate clockwise in a plan view (when viewed from the top). The rotating shaft 2 is configured to transmit the drive of the motor 1 to the impeller 3. The rotating shaft 2 is rotatably supported by bearings 21 and 22. The bearing 21 is provided on the opposite side of the motor 1 (the side opposite to the pump chamber 4). The bearing 22 is provided on the load side (pump chamber 4 side) of the motor 1. The rotating shaft 2 is disposed so as to extend from the motor 1 through the oil chamber 5 to the pump chamber 4. An impeller 3 is attached to the end of the rotary shaft 2 on the pump chamber 4 side.

  The impeller 3 is disposed in the pump chamber 4. The impeller 3 is provided on the rotary shaft 2. The impeller 3 is configured to be driven by the motor 1. The impeller 3 gives velocity energy to water by being driven to rotate. And it is comprised so that pressure may be acted on and sent to water, when the velocity energy of water is converted into pressure energy within the pump chamber 4. That is, by the rotational drive of the impeller 3, water is sucked up from the water suction port 41 of the pump chamber 4, and the water sucked up from the discharge port 42 is discharged.

  The oil chamber 5 is disposed between the motor 1 and the pump chamber 4, and the oil chamber 5 is filled with oil. A wall 51 is disposed on the motor 1 side of the oil chamber 5. An oil lifter 52 is provided around the rotation shaft 2 of the oil chamber 5. A mechanical seal 6 having sliding portions 6a and 6b is provided in the oil chamber 5, and the sliding portions 6a and 6b are lubricated by the oil filled in the oil chamber 5, and the sliding portions 6a and 6b are lubricated. It is comprised so that 6b may be cooled so that it may not burn. The sliding portion 6 b on the load side (pump chamber 4 side) of the mechanical seal 6 is provided on the pump chamber 4 side of the oil chamber 5. That is, the sliding portion 6 b on the load side (pump chamber 4 side) of the mechanical seal 6 is provided so that the pressure water in the pump chamber 4 does not enter the oil chamber 5. A sliding portion 6 a on the side opposite to the load side of the mechanical seal 6 (the side opposite to the pump chamber 4) is provided on the motor 1 side of the oil chamber 5. That is, the sliding portion 6a on the side opposite to the load side of the mechanical seal 6 (the side opposite to the pump chamber 4) is provided so that the fluid containing the oil in the oil chamber 5 does not enter the motor 1 side.

  The oil lifter 52 is provided in a cylindrical shape around the rotation shaft 2. The oil lifter 52 is configured to lift up the oil that moves as the rotary shaft 2 rotates. That is, the oil lifter 52 is configured to supply oil to the sliding portion 6a. A through hole 521 is provided in the lower part of the oil lifter 52. The oil is guided from the through hole 521 to the inner peripheral side of the oil lifter 52.

  The mechanical seal 6 includes a fixed member 61, a rotating member 62, and a spring 63. The fixing member 61 is fixed to the housing of the oil chamber 5. The fixing member 61 is formed in an annular shape so as to surround the rotating shaft 2. The rotating member 62 is attached to the rotating shaft 2. That is, the rotating member 62 is configured to rotate together with the rotating shaft 2. The rotating member 62 is formed in an annular shape so as to surround the rotating shaft 2. The rotating member 62 is biased toward the fixed member 61 by a spring 63. The fixed member 61 and the rotating member 62 are disposed so as to face each other in the axial direction of the rotating shaft 2. The fixed member 61 and the rotating member 62 have sliding surfaces 611 and 621, respectively. That is, in the sliding portions 6a and 6b, the sliding surface 611 of the fixing member 61 and the sliding surface 621 of the rotating member 62 are configured to slide relative to each other. Between the sliding surfaces 611 and 621, the oil in the oil chamber 5 is configured to enter slightly. As a result, the sliding surfaces 611 and 621 are lubricated, cooled by oil so that the sliding surfaces 611 and 621 are not seized, and the sliding portions 6a and 6b (oil chamber 5) are sealed. Has been.

  The annular body 7 is provided so as to protrude from the wall 51 on the side opposite to the load side of the oil chamber 5 (the side opposite to the pump chamber 4) to the motor 1 side. The annular body 7 is provided in an annular shape so as to surround the rotation shaft 2 at a predetermined interval from the rotation shaft 2.

  The annular space 8 is surrounded by the annular body 7. The annular space portion 8 communicates with the sliding portion 6a (sliding surfaces 611 and 621) of the mechanical seal 6 and is formed to extend toward the motor chamber 1d so as to surround the rotating shaft 2. The end of the annular space 8 on the motor chamber 1 d side is sealed with a seal 71.

  The cylindrical pressure member 9 is disposed below the oil chamber 5 (the lower inner surface of the oil chamber 5). The cylindrical pressure member 9 is attached (fixed) to the rotary shaft 2 at a position below the oil chamber 5. Thereby, the cylindrical pressurizing member 9 is configured to be rotated together with the rotating shaft 2. The cylindrical pressure member 9 is generally formed in a cylindrical shape, and the cylindrical pressure member 9 is formed so that the diameter of the inner peripheral surface is substantially equal to the diameter of the outer peripheral surface of the rotary shaft 2. Has been. The cylindrical pressure member 9 is made of a material having high corrosion resistance, for example, rubber. As the rubber, NBR (acrylonitrile butadiene rubber) or the like can be employed. In addition, the cylindrical pressurizing member 9 includes a first fluid pressurizing unit 90 on the outer peripheral portion. The cylindrical pressurizing member 9 and the first fluid pressurizing unit 90 are integrally formed.

  The first fluid pressurizing unit 90 is disposed below the oil chamber 5. Specifically, the first fluid pressurizing unit 90 is disposed at a height position between the impeller 3 and the oil chamber 5. The first fluid pressurizing unit 90 is configured to apply pressure to the water (pressure water) in the pump chamber 4 in the direction opposite to the oil chamber 5 by the rotation of the rotating shaft 2. 1 and 2, the first fluid pressurizing unit 90 is hatched for convenience.

  As shown in FIG. 2, the first fluid pressurizing unit 90 is formed by a groove inclined at 45 degrees with respect to the horizontal plane, for example. The first fluid pressurizing unit 90 is formed so as to have a downward slope when viewed from the side. A plurality of (for example, two) first fluid pressurizing units 90 are provided. The two first fluid pressurizing units 90 are disposed at point-symmetrical positions with respect to the center of the cylindrical pressurizing member 9 in plan view.

  In the first embodiment, the cylindrical pressurizing member 9 (first fluid pressurizing portion 90) is accommodated in the annular portion 53 (see FIG. 1) for allowing the rotary shaft 2 to pass through the lower portion of the oil chamber 5. ing. The edge of the lower end portion of the annular portion 53 is chamfered. In a state where the cylindrical pressurizing member 9 (first fluid pressurizing portion 90) is mounted on the rotary shaft 2 and accommodated in the annular portion 53, the bottom of the cylindrical pressurizing member 9 and the outside of the lower side of the oil chamber 5 are outside. It is almost flush with the side.

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the first is disposed below the oil chamber 5 and applies pressure in the opposite direction to the oil chamber 5 to the water in the pump chamber 4 by the rotation of the rotating shaft 2. A fluid pressurizing unit 90 is provided. Thereby, it is possible to suppress the pressure water in the pump chamber 4 from entering the oil chamber 5. As a result, it is not necessary to forcibly stop the submersible pump and lift it out of the water, remove the pump casing, the oil casing, etc., perform the maintenance work, and restore it. Further, it is not necessary to have a spare submersible electric pump 100 in order to continue the operation. As a result, maintenance and management of the submersible electric pump 100 can be easily performed without requiring much labor and cost for maintenance.

  Moreover, in 1st Embodiment, the 1st fluid pressurization part 90 is formed by the groove part inclined with respect to the horizontal surface. Accordingly, the pressure water in the pump chamber 4 can be pressurized in the direction opposite to the oil chamber 5 by the first fluid pressurizing unit 90 having a simple structure, so that the pressure water in the pump chamber 4 enters the oil chamber 5. Can be easily suppressed.

  In the first embodiment, the impeller 3 is provided on the rotary shaft 2, and the first fluid pressurizing unit 90 is disposed at a height position between the impeller 3 and the oil chamber 5. Thereby, in the area | region between the impeller 3 and the oil chamber 5 in the pump chamber 4, the pressure water of the pump chamber 4 can be pressurized in the opposite direction to the oil chamber 5. As a result, it is possible to efficiently suppress the pressure water in the pump chamber 4 from entering the oil chamber 5.

  In the first embodiment, the first fluid pressurizing unit 90 is provided on the outer peripheral portion of the cylindrical pressurizing member 9. Thereby, by attaching the cylindrical pressurizing member 9 provided with the first fluid pressurizing unit 90 to the rotary shaft 2, the first fluid pressurizing unit 90 can be easily provided in the existing submersible electric pump. it can. Further, by replacing the cylindrical pressurizing member 9, a new first fluid pressurizing unit 90 can be easily provided in the submersible electric pump 100.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. In this 2nd Embodiment, in addition to the structure of 1st Embodiment which provided the cylindrical pressurization member 9 (1st fluid pressurization part 90), the cylindrical pressurization member 11 (2nd fluid pressurization part 110) An example in which is provided will be described. In addition, the same structure as the said 1st Embodiment attaches | subjects and shows the same code | symbol as 1st Embodiment, and abbreviate | omits description.

(Configuration of submersible electric pump)
As shown in FIG. 3, the submersible electric pump 200 according to the second embodiment includes, in addition to the configuration of the first embodiment, a fluid return path 10, a cylindrical pressurizing member 11, an oil rising path 12, A fluid storage unit 13 and a flood detection unit 14 are provided.

  In 2nd Embodiment, the impeller 3 contains the convex part 3b (refer FIG. 4) in the shroud 3a. The convex part 3b is formed in multiple numbers so that it may extend toward the outer peripheral part from the center of the substantially circular impeller 3 in planar view. Each of the convex portions 3b is formed in an arc shape in which the central portion is warped in the clockwise direction in plan view. By rotating the impeller 3, it is possible to send water existing between the shroud 3 a and the outer surface of the lower end of the oil chamber 5 to the outer peripheral side of the impeller 3 along the convex portion 3 b.

  The fluid return path 10 is provided so that the annular space 8 and the oil chamber 5 communicate with each other. The fluid return path 10 is configured to return the fluid containing the oil in the annular space 8 to the oil chamber 5. In addition, the fluid return path 10 is preferably configured by a pipe member such as a pipe or a tube, but may be configured such that an opening formed in an integral model or a groove shape is sealed with a lid. In other words, the annular space 8 and the oil chamber 5 may be configured to communicate with each other.

  The cylindrical pressure member 11 is arranged between the motor 1 and the oil chamber 5 and seals between the motor 1 and the oil chamber 5. The cylindrical pressure member 11 is attached (fixed) to the rotary shaft 2 at a position between the motor 1 and the oil chamber 5. Thereby, the cylindrical pressurizing member 11 is configured to be rotated together with the rotating shaft 2. The cylindrical pressure member 11 is generally formed in a cylindrical shape, and the cylindrical pressure member 11 is formed such that the diameter of the inner peripheral surface is substantially equal to the diameter of the outer peripheral surface of the rotary shaft 2. Has been. The cylindrical pressure member 11 is made of a material having high corrosion resistance, for example, rubber. As the rubber, NBR (acrylonitrile butadiene rubber) or the like can be employed. Moreover, the cylindrical pressurizing member 11 includes a second fluid pressurizing unit 110 at the outer peripheral portion. The cylindrical pressurizing member 11 and the second fluid pressurizing unit 110 are integrally formed.

  The second fluid pressurizing unit 110 is disposed between the motor 1 and the oil chamber 5. Specifically, the second fluid pressurizing unit 110 is disposed between the motor 1 and the oil chamber 5 and at a height position above the fluid return path 10. The second fluid pressurizing unit 110 is configured to apply pressure to the oil chamber 5 side with respect to oil or a mixed fluid of oil and water as the rotating shaft 2 rotates. The second fluid pressurizing unit 110 is configured to communicate with the oil chamber 5 through the fluid return path 10. 3 and 5, the second fluid pressurizing unit 110 is hatched for convenience.

  As shown in FIG. 5, the second fluid pressurizing unit 110 is formed to have a downward slope when viewed from the side. The second fluid pressurizing unit 110 is formed by, for example, a groove inclined at 30 degrees with respect to the horizontal plane. That is, the first fluid pressurizing unit 90 and the second fluid pressurizing unit 110 are each tilted with respect to the horizontal plane, and the tilt angle of the first fluid pressurizing unit 90 with respect to the horizontal plane is the second fluid pressurizing unit 110. Is formed so as to be larger than an inclination angle with respect to the horizontal plane. A plurality of (for example, two) second fluid pressurizing units 110 are provided. The two second fluid pressurizing portions 110 are disposed at point-symmetrical positions with respect to the center of the cylindrical pressurizing member 11 in plan view.

  Returning to FIG. 3, the oil ascending flow path 12 is configured to allow the second fluid pressurizing unit 110 and the motor 1 to communicate with each other. Specifically, the upper portion of the annular space portion 8 and the fluid storage portion 13 provided at the lower portion of the motor 1 are connected via an oil rising channel 12. The oil ascending flow path 12 is configured to transfer the fluid mixture of oil and water in the annular space 8 to the fluid reservoir 13. The oil ascending flow path 12 is desirably configured by a pipe member such as a pipe or a tube, but may be configured such that an opening formed integrally or in a groove shape is sealed with a lid.

  The fluid reservoir 13 is a space provided in the lower part inside the motor 1. The fluid reservoir 13 is disposed at a position below the oil rising channel 12.

  The inundation detection unit 14 is disposed in the fluid storage unit 13. The inundation detection unit 14 is made of a conductive material, and the fluid storage unit 13 is connected to the casing of the submersible electric pump 200, the infiltration detection unit 14, and water that has entered the fluid storage unit 13. It is possible to detect that water has entered the water.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as in the first embodiment, maintenance and management of the submersible electric pump 200 can be easily performed without requiring much labor and cost for maintenance.

  Moreover, in 2nd Embodiment, the 2nd fluid pressurization part 110 which applies a pressure to the oil chamber 5 side with respect to the fluid mixed with oil or oil and water by rotating with the rotating shaft 2 is provided. As a result, pressure can be applied downward to the oil that is about to flow into the oil chamber 5 or a mixed fluid of oil and water, so that the oil rising from the oil chamber 5 can be suppressed.

  In the second embodiment, a fluid return path 10 that communicates the second fluid pressurizing unit 110 and the oil chamber 5 is provided. Thereby, pressure can be applied to the oil flowing into the upper part of the oil chamber 5 or the mixed fluid of oil and water and guided to the fluid return path 10, so that the oil can flow into the upper part of the oil chamber 5 more effectively. Or the mixed fluid of oil and water can be returned to the oil chamber 5.

  In the second embodiment, the first fluid pressurizing unit 90 and the second fluid pressurizing unit 90 are configured such that the tilt angle of the first fluid pressurizing unit 90 with respect to the horizontal plane is larger than the tilt angle of the second fluid pressurizing unit 110 with respect to the horizontal plane. The fluid pressurizing unit 110 is formed. Thereby, a strong pressure can be applied to the pressure water in the pump chamber 4 by the first fluid pressurizing unit 90 that can apply a stronger pressure to the fluid than the second fluid pressurizing unit 110. The pressure water in the pump chamber 4 can be effectively pressurized in the direction opposite to the oil chamber 5. In addition, oil having a greater resistance than water or a mixed fluid of oil and water is supplied to the oil chamber 5 by the second fluid pressurizing unit 110 that can apply a pressure smaller than that of the first fluid pressurizing unit 90 to the fluid. It can suppress that the rotational force of the rotating shaft 2 of the submersible electric pump 200 is greatly impaired while returning to the side.

  Further, in the second embodiment, an oil rising flow path 12 that connects the second fluid pressurizing unit 110 and the motor 1 is provided. Thereby, even when oil or a mixed fluid of oil and water flows out (leaks out) above the oil chamber 5, the oil or the mixed fluid of oil and water is released to the oil ascending flow path 12. Therefore, it is possible to suppress the oil or the mixed fluid of oil and water from directly contacting the bearing and the power unit of the motor 1.

  In the second embodiment, the fluid reservoir 13 is provided in the lower part inside the motor 1. Thereby, even when oil or a mixed fluid of oil and water flows out above the oil chamber 5, the fluid or the mixed fluid of oil and water can be stored in the fluid storage unit 13, Oil or a mixed fluid of oil and water can be effectively prevented from coming into direct contact with the bearing or power unit of the motor 1.

  In the second embodiment, the inundation detection unit 14 is disposed in the fluid storage unit 13. Accordingly, when it is detected that water has entered the fluid reservoir 13, the operation of the submersible electric pump 200 can be urgently stopped, so that the fluid that has flowed out of the oil chamber 5 does not reach the motor 1. be able to. In addition to the emergency stop of the submersible electric pump 200, the user can be notified by an alarm or the like that water has entered the fluid storage unit 13.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIG. In the third embodiment, unlike the first embodiment in which the first fluid pressurizing unit 90 is provided on the cylindrical pressurizing member 9, an example in which the first fluid pressurizing unit 190 is provided on the rotating shaft 2 will be described. . In addition, the same structure as the said 1st Embodiment attaches | subjects and shows the same code | symbol as 1st Embodiment, and abbreviate | omits description.

(Configuration of submersible electric pump)
As shown in FIG. 6, the submersible electric pump 300 according to the third embodiment includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and a mechanical seal 6. . The submersible electric pump 300 includes an annular body 7 and an annular space 8.

  In the third embodiment, the first fluid pressurizing unit 190 is a groove formed in the rotating shaft 2. The first fluid pressurizing unit 190 is formed on the outer peripheral surface of the rotating shaft 2. The rotating shaft 2 is made of, for example, stainless steel. The first fluid pressurizing unit 190 is disposed at least below the oil chamber 5 (the lower inner surface of the oil chamber 5). Specifically, a part of the first fluid pressurizing unit 190 is arranged at a position below the oil chamber 5, and the other part is arranged at the same height as the oil chamber 5. Moreover, the 1st fluid pressurization part 190 is formed above the impeller 3 (blade part 32).

  The first fluid pressurizing unit 190 is formed by a downward-sloping groove that is inclined by 45 degrees with respect to the horizontal plane, for example. The first fluid pressurizing unit 190 is formed to have a shape corresponding to a part of the helix (a shape corresponding to one turn of the helix). In FIG. 6, for convenience, the first fluid pressurizing unit 190 is hatched.

  The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

(Effect of the third embodiment)
In the third embodiment, the following effects can be obtained.

  In the third embodiment, as in the first embodiment, maintenance and management of the submersible electric pump 300 can be easily performed without requiring much labor and cost for maintenance. In the third embodiment, since the first fluid pressurizing unit 190 can be arranged without providing the cylindrical pressurizing member 9, the pressure water in the pump chamber 4 is supplied to the oil chamber 5 while reducing the number of parts. Intrusion into the inside can be suppressed.

  The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

[Fourth Embodiment]
Next, a fourth embodiment will be described with reference to FIG. In the fourth embodiment, unlike the first embodiment in which the first fluid pressurizing unit 90 is provided in the cylindrical pressurizing member 9, an example in which the first fluid pressurizing unit 290 is provided in a part of the oil chamber 5. Will be described. In addition, the same structure as the said 1st Embodiment attaches | subjects and shows the same code | symbol as 1st Embodiment, and abbreviate | omits description.

(Configuration of submersible electric pump)
As shown in FIG. 7, the submersible electric pump 400 according to the fourth embodiment includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and a mechanical seal 6. . The submersible electric pump 400 includes an annular body 7 and an annular space 8.

  In the fourth embodiment, the first fluid pressurizing unit 290 is provided in the lower part of the oil chamber 5. Specifically, the first fluid pressurizing portion 290 is a groove portion formed in the annular portion 53 that is provided at the lower end portion of the oil chamber 5 and supports the rotary shaft 2 rotatably. The first fluid pressurizing part 290 is formed on the inner peripheral surface 53 a of the annular part 53 of the oil chamber 5. The first fluid pressurizing unit 290 is disposed below the oil chamber 5 (the lower inner surface of the oil chamber 5). Moreover, the 1st fluid pressurization part 290 is formed above the impeller 3 (blade part 32).

  The first fluid pressurizing part 290 is formed by a downward-sloping groove part inclined at 45 degrees with respect to the horizontal plane, for example. The first fluid pressurizing unit 290 is formed to have a shape corresponding to a part of the helix (a shape corresponding to one turn of the helix).

  In addition, the other structure of 4th Embodiment is the same as that of the said 1st Embodiment.

(Effect of 4th Embodiment)
In the fourth embodiment, the following effects can be obtained.

  In the fourth embodiment, as in the first embodiment, maintenance and management of the submersible electric pump 400 can be easily performed without requiring much labor and cost for maintenance. In the fourth embodiment, the first fluid pressurizing unit 290 can be disposed without providing the cylindrical pressurizing member 9, so that the pressure water in the pump chamber 4 is supplied to the oil chamber 5 while reducing the number of parts. Intrusion into the inside can be suppressed.

  The remaining effects of the fourth embodiment are similar to those of the aforementioned first embodiment.

[Fifth Embodiment]
Next, a fifth embodiment will be described with reference to FIG. In the fifth embodiment, unlike the first embodiment in which the first fluid pressurizing unit 90 is provided in the cylindrical pressurizing member 9, an example in which the first fluid pressurizing unit 390 is provided in the impeller 3 will be described. . In addition, the same structure as the said 1st Embodiment attaches | subjects and shows the same code | symbol as 1st Embodiment, and abbreviate | omits description.

(Configuration of submersible electric pump)
As shown in FIG. 8, the submersible electric pump 500 according to the fifth embodiment includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and a mechanical seal 6. . The submersible electric pump 500 includes an annular body 7 and an annular space 8.

  The impeller 3 is provided at the lower end of the rotating shaft 2. An upper portion 31 (a portion above the blade portion 32) of the impeller 3 is configured to be surrounded by an annular portion 53 provided at the lower end portion of the oil chamber 5. Specifically, when viewed from the side, the upper portion 31 of the impeller 3 is disposed at the same height as the annular portion 53.

  In the fifth embodiment, the first fluid pressurizing unit 390 is a groove formed in the impeller 3. Specifically, the first fluid pressurizing unit 390 is formed on the outer peripheral surface of the upper portion 31 of the impeller 3. The first fluid pressurizing unit 390 is at least partially disposed below the oil chamber 5 (the lower inner surface of the oil chamber 5). In FIG. 8, the first fluid pressurizing unit 390 is hatched for convenience.

  The first fluid pressurizing unit 390 is formed by a downward-sloping groove that is inclined by 45 degrees with respect to the horizontal plane, for example. The first fluid pressurizing part 390 is formed by a groove part inclined at 45 degrees. A plurality of (for example, two) first fluid pressurizing units 390 are provided. The two first fluid pressurizing portions 390 are disposed at point-symmetrical positions with respect to the center of the cylindrical pressurizing member 9 in plan view.

  The first fluid pressurizing unit 390 has a function of suppressing the pressure water in the pump chamber 4 from entering the oil chamber 5, and lowers the water between the upper portion 31 of the impeller 3 and the annular portion 53 downward. It can be discharged (dropped). For this reason, when the submersible electric pump 500 is stopped, it becomes difficult for water to accumulate between the upper part 31 of the impeller 3 and the annular part 53, so that the gap between the upper part 31 of the impeller 3 and the annular part 53 is not increased. Corrosion of the rotating shaft 2, the impeller 3, and the annular portion 53 due to corrosion of the remaining water can be suppressed.

  The remaining configuration of the fifth embodiment is similar to that of the aforementioned first embodiment.

(Effect of 5th Embodiment)
In the fifth embodiment, the following effects can be obtained.

  In the fifth embodiment, as in the first embodiment, maintenance and management of the submersible electric pump 500 can be easily performed without requiring much labor and cost for maintenance. In the fifth embodiment, since the first fluid pressurizing unit 390 can be arranged without providing the cylindrical pressurizing member 9, the pressure water in the pump chamber 4 is supplied to the oil chamber 5 while reducing the number of parts. Intrusion into the inside can be suppressed. Further, since it is difficult for water to collect between the upper part 31 of the impeller 3 and the annular part 53, the water remaining between the upper part 31 of the impeller 3 and the annular part 53 is corroded, so that the rotary shaft 2. It is possible to prevent the impeller 3 and the annular portion 53 from being corroded.

  The remaining effects of the fifth embodiment are similar to those of the aforementioned first embodiment.

(Modification)
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, the example in which the first fluid pressurizing unit 90 is a separate member from the rotating shaft 2 is shown, but the present invention is not limited to this. In this invention, the 1st fluid pressurization part may be comprised integrally with the rotating shaft.

  Moreover, in the said 2nd Embodiment, although the 2nd fluid pressurization part 110 showed the example which is a separate member from the rotating shaft 2, this invention is not limited to this. In this invention, the 2nd fluid pressurization part may be comprised integrally with the rotating shaft.

  Moreover, although the example which provided the mechanical seal 6 in both the pump chamber 4 side and the motor 1 side of the oil chamber 5 was demonstrated in the said 2nd Embodiment, this invention is not limited to this. In the present invention, the mechanical seal 6 may be provided only on the pump chamber 4 side of the oil chamber 5.

  Moreover, in the said 1st-5th embodiment, although the 1st fluid pressurization part 90, 190, 290 and 390 showed the example formed by the groove part, this invention is not limited to this. In the present invention, for example, as shown in FIG. 9, the first fluid pressurizing portion may be formed by a convex portion. Moreover, in this invention, the 1st fluid pressurization part may be formed combining both a convex part and a groove part. In addition, in this specification, the 1st fluid pressurization part formed with the groove part is shown by narrow hatching, and the 1st fluid pressurization part formed by the convex part is shown by wide hatching as needed. Are shown.

  Moreover, in the said 1st Embodiment, the 1st fluid pressurization part 90 (cylindrical pressurization member 9) is formed with rubber | gum, and in 2nd Embodiment, the 1st fluid pressurization part 90 and the 2nd fluid pressurization Although the example in which the part 110 (cylindrical pressure member 11) is formed of rubber is shown, the present invention is not limited to this. In the present invention, the first fluid pressurizing unit 90 (cylindrical pressurizing member 9) and the second fluid pressurizing unit 110 (cylindrical pressurizing member 11) may each be formed of a metal such as stainless steel. .

  Moreover, although the example which arrange | positions the 2nd fluid pressurization part 90 in total was shown in the said 1st and 2nd embodiment, this invention is not limited to this. In the present invention, the total number of first fluid pressurizing units may be one, or three or more. For example, as shown in FIG. 10, a total of four first fluid pressurizing parts constituted by groove parts may be provided. Moreover, as shown in FIG. 11, you may provide a total of four 1st fluid pressurization parts comprised by a convex part.

  In the first and second embodiments, the example in which the first fluid pressurizing unit 90 is arranged at a point-symmetrical position with respect to the center of the cylindrical pressurizing member 9 in the plan view is shown. The present invention is not limited to this. In the present invention, the first fluid pressurizing unit may be disposed at a position that is not point-symmetric with respect to the center of the cylindrical pressurizing member 9 in plan view. For example, as shown in FIG. 12, the first fluid pressurizing unit may be disposed only on one side of the cylindrical pressurizing member in plan view. Moreover, as shown in FIG. 13, the 1st fluid pressurization part may be formed in the helical form. Further, as shown in FIGS. 14 and 15, in each of the configurations of FIGS. 12 and 13, the first fluid pressurizing portion may be configured by replacing the groove portion with a convex portion.

  In the third and fourth embodiments, the first fluid pressurizing units 190 and 290 are formed to have a shape corresponding to a part of the helix (a shape corresponding to one turn of the helix). However, the present invention is not limited to this. In the present invention, for example, as shown in FIGS. 16 and 17, the first fluid pressurizing portion may be formed in a spiral shape that is wound a plurality of times.

  Moreover, in the said 1st-5th embodiment, although the example which forms the 1st fluid pressurization part 90 inclined 45 degree | times with respect to a horizontal surface was shown, this invention is not limited to this. In this invention, you may form the 1st fluid pressurization part which inclines in the range of 30 to 60 degree | times with respect to a horizontal surface.

  Moreover, in the said 2nd Embodiment, although the example which forms the 2nd fluid pressurization part 110 inclined 30 degree | times with respect to a horizontal surface was shown, this invention is not limited to this. In this invention, you may form the 2nd fluid pressurization part which inclines in the range of more than 30 degree | times and 60 degrees or less with respect to a horizontal surface.

  Moreover, in the said 2nd Embodiment, although the inclination angle with respect to the horizontal surface of the 1st fluid pressurization part 90 showed an example larger than the inclination angle with respect to the horizontal surface of the 2nd fluid pressurization part 110, this invention is not limited to this. Absent. In the present invention, the inclination angle of the first fluid pressurizing unit with respect to the horizontal plane and the inclination angle of the second fluid pressurizing unit with respect to the horizontal plane may be the same. In addition, the inclination angle of the second fluid pressurizing unit with respect to the horizontal plane may be larger than the inclination angle of the first fluid pressurizing unit with respect to the horizontal plane.

  Moreover, although the example which arrange | positions the 1st fluid pressurization part 90 and the 2nd fluid pressurization part 110 from which a shape mutually differs was shown in the said 2nd Embodiment, this invention is not limited to this. In this invention, you may arrange | position the 1st fluid pressurization part and 2nd fluid pressurization part of the same shape. Thereby, the kind of components can be reduced.

  Moreover, in the said 1st and 2nd embodiment, although the example containing the 1st fluid pressurization part 90 formed in the outer peripheral part of the cylindrical pressurization member 9 by the groove part was shown, this invention is not limited to this. In this invention, as shown in FIG. 18, you may provide the 1st fluid pressurization part 90 formed by the through-hole which penetrates a cylindrical pressurization member linearly from the upper part to the lower part. The inner diameter of the through hole (first fluid pressurizing unit 90) is, for example, 5 mm or more and 6 mm or less. For example, a plurality (four) of the through holes (first fluid pressurizing unit 90) may be arranged at an angular interval of about 90 degrees in a plan view. The through hole (first fluid pressurizing unit 90) may be formed to extend in an inclined state with respect to a horizontal plane at an angle of 30 degrees or more and 60 degrees or less, for example. With this through-hole, the cylindrical pressure member rotates together with the rotating shaft so that water existing (enters) between the upper surface of the cylindrical pressure member and the casing of the pump chamber passes through the through-hole. It can be sent out below the cylindrical pressure member.

  Moreover, you may provide in the upper surface part of a cylindrical pressurization member the groove | channel 90a formed so that it might connect with a some through-hole while being along the outer periphery of a cylindrical pressurization member. Moreover, the upper end part of a through-hole may be formed so that it may have the hollow part 90b hollow in a mortar shape (refer FIG. 19). As a result, water can be easily drawn into the through hole. In addition, you may provide the 1st fluid pressurization part formed of the through-hole together with the 1st fluid pressurization part formed of the groove part or the convex part.

  Moreover, although the said 2nd-4th embodiment showed the example which formed multiple convex parts 3b extended toward an outer peripheral part from the center of the substantially circular impeller 3 in planar view, this invention is not limited to this. Absent. In this invention, as shown in FIG. 20, you may form the recessed part 3c extended toward an outer peripheral part from the center of the substantially circular impeller 3 in planar view. In this case, for example, the recess 3c may be formed with a spiral recess 3c (see FIG. 21) having one end at the center of the impeller 3 and the other end at the outer edge in plan view. .

DESCRIPTION OF SYMBOLS 1 Motor 2 Rotating shaft 3 Impeller 4 Pump chamber 5 Oil chamber 9 Cylindrical pressurization member 10 Fluid return path 12 Oil rising path 13 Fluid storage part 14 Inundation detection part 90, 190, 290, 390 1st fluid pressurization part 100, 200, 300, 400, 500 Submersible electric pump 110 Second fluid pressurizing unit

Claims (10)

A motor that rotates the rotating shaft;
A pump chamber in which an impeller driven by the motor is disposed;
An oil chamber disposed between the motor and the pump chamber;
A submersible electric pump provided with the 1st fluid pressurization part which is arranged below the oil chamber and applies pressure to the water in the pump chamber in the direction opposite to the oil chamber by rotating the rotating shaft.   2. The submersible electric pump according to claim 1, wherein the first fluid pressurizing part is formed by at least one of a groove part or a convex part inclined with respect to a horizontal plane. The impeller is provided on the rotating shaft,
The submersible electric pump according to claim 1 or 2, wherein the first fluid pressurizing unit is disposed at a height position between the impeller and the oil chamber. A cylindrical pressure member attached to the rotary shaft at a position below the oil chamber and rotating together with the rotary shaft;
The submersible electric pump according to any one of claims 1 to 3, wherein the first fluid pressurizing unit is provided on an outer peripheral portion of the cylindrical pressurizing member.   5. The apparatus according to claim 1, further comprising a second fluid pressurizing unit that applies pressure to the oil chamber with respect to oil or a mixed fluid of oil and water by rotating together with the rotating shaft. The submersible electric pump described in 1.   The submersible electric pump according to claim 5, further comprising a fluid return path that communicates the second fluid pressurizing unit and the oil chamber.   Each of the first fluid pressurizing unit and the second fluid pressurizing unit is inclined with respect to a horizontal plane, and an inclination angle of the first fluid pressurizing unit with respect to the horizontal plane is a horizontal plane of the second fluid pressurizing unit. The submersible electric pump according to claim 5 or 6, wherein the submersible electric pump is formed so as to be larger than an inclination angle with respect to.   The submersible electric pump according to any one of claims 5 to 7, further comprising an oil ascending channel that communicates the second fluid pressurizing unit and the motor.   The submersible electric pump according to any one of claims 1 to 8, wherein a fluid storage section is provided in a lower portion inside the motor.   The submersible electric pump according to claim 9, wherein an immersion detection unit is disposed in the fluid storage unit.

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