JP2017023952A - Submerged electric pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged electric pump capable of discharging water and air containing oxygen and thereby capable of supplying air containing oxygen into water even when installed at an underwater deep position.SOLUTION: A submerged electric pump 100 comprises: a motor 1; a pump chamber 4 in which an impeller 3 driven by the motor 1 is arranged and which includes a discharge port 42; an air supply pipe 61 for supplying air containing oxygen to water discharged from the discharge port 42; a pressure device 7 connected to the air supply pipe 61 and for pressurizing the air containing oxygen supplied from the air supply pipe 61; and a pressure sensor 43 for detecting water pressure in the pump chamber 4. The pressure device 7 pressurizes the air containing oxygen supplied from the air supply pipe 61 based on a detection result of the pressure sensor 43.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a submersible electric pump.

  Conventionally, in order to prevent the decay of water in closed spaces such as ponds, aquarium tanks, and fish tanks, aeration pumps that discharge with water while supplying oxygen-containing air to the water in the ponds and tanks ( An underwater electric pump is known (for example, refer to Patent Document 1).

JP 2003-334575 A

  However, in the aeration pump (submersible electric pump) of Patent Document 1, when the pump body is installed at a deep water position and aeration is performed at a deep water position, the supplied oxygen-containing air is repelled by a high water pressure. Therefore, there is a problem that it is difficult to discharge air containing oxygen together with water.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to discharge air containing oxygen together with water even when the submersible electric pump is installed at a deep water position. And providing an underwater electric pump capable of supplying air containing oxygen into water.

  The submersible electric pump according to one aspect of the present invention includes a motor, an impeller driven by the motor, a pump chamber including a water discharge port, and air containing oxygen in water discharged from the discharge port An air supply pipe for supplying pressure, a pressurizing device connected to the air supply pipe for pressurizing air containing oxygen supplied from the air supply pipe, and a pressure sensor for detecting the water pressure in the pump chamber. Based on the detection result, the air containing oxygen supplied from the air supply pipe is pressurized by a pressurizing device.

  As described above, the submersible electric pump according to one aspect of the present invention is configured to pressurize the air containing oxygen supplied from the air supply pipe by the pressurizing device based on the detection result of the pressure sensor. Thereby, even when the submersible electric pump is installed at a deep water position, air containing oxygen can be prevented from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply water containing oxygen into the water, so that the water in the pond or tank in which the submersible electric pump is installed can be prevented from decaying. Moreover, since air containing oxygen is pressurized by the pressurizing device based on the detection result of the pressure sensor, it is not necessary to apply excessive pressure to the air. Thereby, it can suppress that an excessive load is applied to the part which contacts the air pressurized by the pressurizer and the pressurizer.

  In the submersible electric pump according to the above aspect, the air containing oxygen supplied from the air supply pipe is preferably pressurized to a pressure higher than the water pressure of the pump chamber by a pressurizing device based on the detection result of the pressure sensor. Has been. If comprised in this way, since it can suppress reliably that the air containing the oxygen supplied from an air supply pipe is repelled by a water pressure, even when an underwater electric pump is installed in the deep water position, The supply of air containing oxygen can be performed reliably.

  In the submersible electric pump according to the above aspect, preferably, based on the detection result of the pressure sensor, when the water pressure in the pump chamber is equal to or lower than a predetermined value, air containing oxygen is supplied from the air supply pipe by natural intake air. It is configured. With this configuration, when the water pressure in the pump chamber is equal to or lower than the predetermined value, no pressure is applied to the oxygen-containing air, so that a load is prevented from being applied to the pressurizing device and the portion in contact with the supplied air. can do.

  In this case, preferably, a reduction portion where the flow path of water becomes narrow is connected to the discharge port, and the air supply pipe is connected in the vicinity of the reduction portion. If comprised in this way, since the pressure of the water discharged in a reduction | restoration part becomes small, the air containing oxygen can be easily inhaled from the air supply pipe connected to the reduction | restoration part vicinity.

  In the configuration in which the reduction portion is connected to the discharge port, preferably, oxygen is supplied to the air supply pipe according to a state in which the air supply pipe is pressurized and a state in which natural suction is performed from the air supply pipe. A switching unit that switches the air supply path is further provided. If comprised in this way, according to the state in which an air supply pipe is pressurized, and the state in which natural intake is carried out from an air supply pipe, the path | route in which the air containing oxygen is supplied can be switched easily by a switching part. it can.

  In the submersible electric pump according to the one aspect, preferably, a mechanical seal having a sliding portion is provided, and further includes an oil chamber disposed between the motor and the pump chamber, and the pressurizing device is attached to the air supply pipe. In addition, it is configured to pressurize at least one of the motor and the oil chamber. If comprised in this way, since it is possible to suppress water from the pump chamber and oil rise from the oil chamber to the motor side, there is no need to perform maintenance work by removing the pump casing, oil casing, and the like. As a result, it is not necessary to have a spare pump to continue the operation, and therefore 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 one aspect, preferably, a mechanical seal having a sliding portion is provided, and the oil chamber is disposed between the motor and the pump chamber, and is disposed between the motor and the oil chamber. The pressurizing device is configured to pressurize at least one of the motor, the oil chamber, and the oil reservoir in addition to the air supply pipe. With such a configuration, it is possible to suppress water from the pump chamber, oil rising from the oil chamber to the oil reservoir, and oil rising from the oil reservoir to the motor side. It is no longer necessary to perform maintenance work. As a result, it is not necessary to have a spare pump to continue the operation, and therefore maintenance and management of the submersible electric pump can be easily performed without requiring much labor and cost for maintenance.

  In the configuration including the oil chamber, the mechanical seal is preferably provided at least on the pump chamber side of the oil chamber. If comprised in this way, the water immersion from a pump chamber to an oil chamber can be suppressed effectively. In addition, when a mechanical seal is provided on the pump chamber side of the oil chamber and a mechanical seal is not provided on the opposite side of the pump chamber of the oil chamber, the structure of the mechanical seal can be simplified and the side opposite to the pump chamber The height dimension of the submersible electric pump can be reduced by the amount not provided with the mechanical seal.

  According to the present invention, as described above, even when the submersible electric pump is installed at a deep water position, it is possible to discharge air containing oxygen together with water and supply air containing oxygen into water. .

It is the schematic which showed the submersible electric pump 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 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 which showed the submersible electric pump by 6th Embodiment of this invention. It is the schematic which showed the submersible electric pump by 7th Embodiment of this invention. It is the schematic which showed the submersible electric pump by 8th Embodiment of this invention. It is the schematic which showed the submersible electric pump by 9th Embodiment of this invention. It is the schematic which showed the submersible electric pump by 10th 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 FIG. As shown in FIG. 1, the submersible electric pump 100 according to the first embodiment includes a submersible electric pump main body 101 arranged in water. The submersible electric pump main body 101 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, and an oil chamber 5. An air supply unit 6 is connected to the submersible electric pump main body 101. A pressure device 7 is connected to the air supply unit 6. A control unit 10 is connected to the submersible electric pump main body 101. The submersible electric pump main body 101 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  The motor 1 includes a stator 11 and a rotor 12. The motor 1 is sealed so that water from the outside does not enter. Further, the motor 1 is configured to rotationally drive the impeller 3 (rotating shaft 2).

  The stator 11 has a coil. The stator 11 is disposed on the outer periphery of the motor 1. Further, the power is supplied from the cable 13 to the coil of the stator 11 so that a magnetic field is generated. The rotor 12 is disposed inside the motor 1 so as to face the stator 11. The rotor 12 is attached to the rotating shaft 2. The rotor 12 is configured to rotate by a magnetic field from the stator 11.

  The rotating shaft 2 is configured to rotate by driving the motor 1. The rotary 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 arranged 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 motor 1 is sealed with a seal 23. Specifically, the seal 23 is provided below the bearing 22. As the seal 23, for example, an oil seal, a seal lip, or a seal having a mechanism for generating a thrust force on the load side such as an inclined rib or a groove at a lip portion that slides with the rotary shaft 2 is used.

  The impeller 3 is disposed in the pump chamber 4. Moreover, the impeller 3 gives speed energy to water by rotationally driving. 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.

  Here, in the first embodiment, the pump chamber 4 is provided with a pressure sensor 43 that detects the pressure in the pump chamber 4. The pressure sensor 43 is connected to the control unit 10 via the cable 13. The pressure sensor 43 is configured to transmit information on the detected pressure (water pressure) in the pump chamber 4 to the control unit 10. Further, a strainer 44 is provided on the side of the water inlet 41 of the pump chamber 4. The strainer 44 is provided to prevent foreign matters such as dust from entering the pump chamber 4. The strainer 44 is provided with a plurality of holes 441. Water sucked from the plurality of holes 441 of the strainer 44 is supplied to the pump chamber 4 through the water suction port 41.

  The oil chamber 5 is disposed between the motor 1 and the pump chamber 4. The oil chamber 5 is filled with oil. A wall 51 is disposed on the motor 1 side of the oil chamber 5. Further, a mechanical seal 52 having a sliding portion is provided in the oil chamber 5. The mechanical seal 52 is configured such that the sliding portion is lubricated by the oil filled in the oil chamber 5 and cooled so that the sliding portion is not seized by the oil. The sliding portions of the mechanical seal 52 are provided on the load side (pump chamber 4 side) and the anti-load side (opposite side to the pump chamber 4), respectively. The sliding portion on the load side (pump chamber 4 side) of the mechanical seal 52 is provided so that the pressure water in the pump chamber 4 does not enter the oil chamber 5. The sliding portion on the side opposite to the load side of the mechanical seal 52 (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 chamber 5 is provided with an oil lifter 53. Specifically, the oil lifter 53 is provided in a cylindrical shape around the rotation shaft 2. The oil lifter 53 is configured to lift up the oil that moves as the rotary shaft 2 rotates. That is, the oil lifter 53 is configured to supply oil to the upper sliding portion of the mechanical seal 52. A through hole is provided in the lower part of the oil lifter 53. The oil is guided from the through hole to the inner peripheral side of the oil lifter 53.

  The air supply unit 6 includes an air supply pipe 61, a reduction unit 62, a discharge port 63, a gas-liquid mixing unit 64, and a switching unit 65. The air supply unit 6 is connected to the discharge port 42 of the submersible electric pump main body 101. The air supply unit 6 is provided to mix water discharged from the submersible electric pump main body unit 101 with air containing oxygen and discharge it from the discharge port 63.

  The air supply pipe 61 is configured to supply air containing oxygen to water discharged from the discharge port 42 of the submersible electric pump main body 101. Specifically, the air supply pipe 61 is formed in a tubular shape and is disposed so as to extend in the vertical direction. Further, the upper portion of the air supply pipe 61 comes out of the water and is configured to be supplied with air by a natural suction or pressurizing device 7. The lower part of the air supply pipe 61 is connected to the gas-liquid mixing unit 64.

  The reduction unit 62 is disposed adjacent to the discharge port 42 of the submersible electric pump main body 101. That is, the water discharged from the discharge port 42 immediately flows into the reduction unit 62. The reduction part 62 is formed so that the flow path of water becomes narrower from upstream to downstream. Thereby, the flow velocity of the water flowing through the reduction part 62 becomes larger on the downstream side than on the upstream side. As a result, the pressure of the water flowing through the reducing portion 62 becomes smaller on the downstream side than on the upstream side. The downstream side of the reduction unit 62 is connected to the gas-liquid mixing unit 64. That is, the air supply pipe 61 is connected in the vicinity of the reduction unit 62.

  The discharge port 63 is configured so that water mixed by the gas-liquid mixing unit 64 and air containing oxygen are discharged. In the gas-liquid mixing unit 64, the water discharged from the reduction unit 62 and the air containing oxygen supplied from the air supply pipe 61 are mixed. That is, in the gas-liquid mixing unit 64, the water discharged from the reducing unit 62 is mixed so that air containing oxygen is involved, and is sent to the discharge port 63.

  The switching unit 65 is configured to switch the supply path of air containing oxygen to the air supply pipe 61 according to the state in which the air supply pipe 61 is pressurized and the state in which natural intake is performed from the air supply pipe 61. Has been. Specifically, the switching unit 65 is configured to block the passage of air connected to the pressurizing device 7 and open the passage of naturally aspirated air when naturally sucked from the air supply pipe 61. ing. Further, when the air supply pipe 61 is pressurized by the pressurizing device 7, the switching unit 65 closes the passage of naturally aspirated air and opens the air passage connected to the pressurizing device 7. It is configured. The switching unit 65 is configured to switch the supply path of air containing oxygen to the air supply pipe 61 by rotating about the rotation axis. That is, the switching unit 65 is configured to rotate upward against gravity by being pushed by the pressurized air when the oxygen supply air is supplied to the air supply pipe 61 by the pressurizing device 7. Has been. Moreover, the switching part 65 is comprised so that it may rotate below by gravity, when naturally inhaled.

  The pressurizing device 7 is connected to the air supply pipe 61 through a pipe 71 and a valve 71a. The pressurizing device 7 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61. The pressurizing device 7 is configured to be able to adjust the pressure applied to the air supply pipe 61. The pressurizing device 7 is constituted by, for example, a compressor. The pressurizing device 7 is configured to supply air containing oxygen to the air supply pipe 61 via the pipe 71 after inhaling and pressurizing air containing oxygen. The pressurizing device 7 is connected to the control unit 10. The valve 71a is configured to be opened when the pressurizing device 7 is driven to pressurize the air supply pipe 61, and is closed when naturally aspirated and when the submersible electric pump 100 is stopped.

  The control unit 10 is connected to the submersible electric pump main body 101 via the cable 13. The controller 10 is provided on a control panel for driving the submersible electric pump main body 101. The control unit 10 is configured to control the driving of the motor 1. The control unit 10 is configured to control the pressurizing device 7.

  Here, in the first embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43. . Specifically, based on the detection result of the pressure sensor 43, the control unit 10 pressurizes the air containing oxygen supplied from the air supply pipe 61 to a pressure higher than the water pressure of the pump chamber 4 by the pressurizing device 7. It is configured. For example, the pressurizing device 7 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43. . In addition, based on the detection result of the pressure sensor 43, the control unit 10, when the water pressure in the pump chamber 4 is equal to or lower than a predetermined value, does not drive the pressurizing device 7 and does not drive the pressurizing device 7 and contains oxygen by natural intake air. Is controlled to be supplied.

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

  In the first embodiment, as described above, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizing device 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 100 is installed at a deep water position, air containing oxygen can be suppressed from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply water containing oxygen into the water, so that the decay of water in the pond or tank in which the submersible electric pump 100 is installed can be suppressed. Further, since air containing oxygen is pressurized by the pressurizing device 7 based on the detection result of the pressure sensor 43, it is not necessary to apply excessive pressure to the air. Thereby, it can suppress that an excessive load is applied to the pressurizing device 7 and the portion in contact with the air pressurized by the pressurizing device 7.

  Further, in the first embodiment, as described above, based on the detection result of the pressure sensor 43, the oxygen-containing air supplied from the air supply pipe 61 is applied to a pressure higher than the water pressure in the pump chamber 4 by the pressurizing device 7. Configure to press. As a result, air containing oxygen supplied from the air supply pipe 61 can be reliably prevented from being repelled by water pressure, so even when the submersible electric pump 100 is installed at a deep water depth, oxygen into the water can be reduced. Supply of the air which contains can be performed reliably.

  Further, in the first embodiment, as described above, based on the detection result of the pressure sensor 43, when the water pressure in the pump chamber 4 is equal to or lower than the predetermined value, the air supply pipe 61 is naturally driven without driving the pressurizing device 7. It is configured such that air containing oxygen is supplied by intake air. As a result, when the water pressure in the pump chamber 4 is equal to or lower than a predetermined value, pressure is not applied to the oxygen-containing air, so that it is possible to suppress the load from being applied to the pressurizing device 7 and the portion in contact with the supplied air. Can do.

  In the first embodiment, as described above, the reducing portion 62 in which the flow path of water is narrowed is connected to the discharge port 42, and the air supply pipe 61 is connected to the vicinity of the reducing portion 62. Thereby, since the pressure of the water discharged in the reduction | restoration part 62 becomes small, the air containing oxygen can be suck | inhaled easily from the air supply pipe | tube 61 connected to the reduction | restoration part 62 vicinity.

  Further, in the first embodiment, as described above, air containing oxygen to the air supply pipe 61 according to the state where the air supply pipe 61 is pressurized and the state where the air supply pipe 61 is naturally aspirated. A switching unit 65 for switching the supply path is provided. Thereby, the path through which oxygen-containing air is supplied can be easily switched by the switching unit 65 in accordance with the state in which the air supply pipe 61 is pressurized and the state in which the air supply pipe 61 is naturally inhaled. .

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a configuration in which an oil reservoir 8 is provided between the oil chamber 5 and the motor 1 will be described.

  As shown in FIG. 2, the submersible electric pump 200 according to the second embodiment includes a submersible electric pump main body 201 disposed in water. The submersible electric pump main body 201 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and an oil reservoir 8. An air supply unit 6 is connected to the submersible electric pump main body 201. A pressure device 7 is connected to the air supply unit 6. In addition, the control unit 10 is connected to the submersible electric pump main body 201. The submersible electric pump main body 201 is a vertical submersible electric pump in which the rotating shaft 2 extends in the vertical direction.

  The oil chamber 5 is filled with oil. Further, a mechanical seal 54 having a sliding portion is provided in the oil chamber 5. Specifically, the mechanical seal 54 is provided on the oil chamber 5 on the pump chamber 4 side. That is, the sliding part of the mechanical seal 54 is provided on the load side (the pump chamber 4 side). The oil reservoir 5 side of the oil chamber 5 is sealed with a seal 55. As the seal 55, for example, an oil seal, a seal lip, or a seal having a mechanism for generating a thrust force on the load side such as an inclined rib or a groove at a lip portion that slides with the rotary shaft 2 is used.

  Here, in the second embodiment, the oil reservoir 8 is disposed between the motor 1 and the oil chamber 5. The oil reservoir 8 is surrounded by an annular body 81. The oil reservoir 8 is formed to extend toward the motor 1 so as to surround the rotating shaft 2. Further, the oil reservoir 8 is configured such that a fluid containing oil rising from the seal 55 flows in.

  In the second embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  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, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizing device 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 200 is installed at a deep water position, air containing oxygen can be suppressed from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply water containing oxygen into the water, so that the decay of water in the pond or tank in which the submersible electric pump 200 is installed can be suppressed.

  In the second embodiment, the mechanical seal 54 is provided on the oil chamber 5 on the pump chamber 4 side. As a result, it is possible to effectively suppress water from the pump chamber 4 to the oil chamber 5. In addition, since the mechanical seal 54 is provided on the pump chamber 4 side of the oil chamber 5 and the mechanical seal 54 is not provided on the opposite side of the oil chamber 5 from the pump chamber 4, the configuration of the mechanical seal 54 can be simplified. Since the mechanical seal 54 is not provided on the side opposite to the pump chamber 4, it is not necessary to provide an oil lifter, the height dimension of the submersible electric pump main body 201 can be reduced, and the oil chamber 5 is filled. The amount of oil can be reduced.

  Moreover, in 2nd Embodiment, the oil storage part 8 arrange | positioned between the motor 1 and the oil chamber 5 is provided as mentioned above. Thereby, since the oil rising from the oil chamber 5 is accumulated in the oil reservoir 8, it is possible to suppress the oil from entering the motor 1.

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

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, an example in which a configuration in which the motor 1 is pressurized by the pressurizing device 7 is further added to the configuration of the first embodiment will be described.

  As shown in FIG. 3, the submersible electric pump 300 according to the third embodiment includes a submersible electric pump main body 301 arranged in water. The submersible electric pump main body 301 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, and an oil chamber 5. An air supply unit 6 is connected to the submersible electric pump main body 301. A pressure device 7 is connected to the air supply unit 6. The control unit 10 is connected to the submersible electric pump main body 301. The submersible electric pump main body 301 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the third embodiment, the pressurizing device 7 is configured to pressurize the motor 1 in addition to the air supply pipe 61. Specifically, the pressurizer 7 is connected to the motor 1 via a pipe 72 and a valve 72a. The pressurizing device 7 is configured to be able to adjust the pressure applied to the motor 1. The pressurizing device 7 is configured to pressurize the motor 1 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the motor 1 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43.

  In the third embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  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, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 300 is installed at a deep water position, air containing oxygen can be prevented from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply water containing oxygen into the water, so that the decay of water in the pond or tank in which the submersible electric pump 300 is installed can be suppressed.

  In the third embodiment, the pressurizing device 7 is configured to pressurize the motor 1 in addition to the air supply pipe 61. As a result, oil rising from the oil chamber 5 to the motor 1 side can be suppressed, so that it is not necessary to perform maintenance work by removing the pump casing, the oil casing, and the like. As a result, it is not necessary to have a spare pump to continue operation, so that maintenance and management of the submersible electric pump 300 can be easily performed without requiring much labor and cost for maintenance.

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

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, an example in which a configuration in which the oil chamber 5 is pressurized by the pressurizing device 7 is further added to the configuration of the first embodiment will be described.

  As shown in FIG. 4, the submersible electric pump 400 by 4th Embodiment is equipped with the submersible electric pump main-body part 401 arrange | positioned in water. The submersible electric pump main body 401 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, and an oil chamber 5. An air supply unit 6 is connected to the submersible electric pump main body 401. A pressure device 7 is connected to the air supply unit 6. The controller 10 is connected to the submersible electric pump main body 401. The submersible electric pump main body 401 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the fourth embodiment, the pressurizing device 7 is configured to pressurize the oil chamber 5 in addition to the air supply pipe 61. Specifically, the pressurizing device 7 is connected to the oil chamber 5 via a pipe 73 and a valve 73a. The pressurizing device 7 is configured to be able to adjust the pressure applied to the oil chamber 5. The pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43.

  Further, in the fourth embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  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, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 400 is installed at a deep water position, air containing oxygen can be suppressed from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply air containing oxygen to the water, so that the decay of water in the pond or tank in which the submersible electric pump 400 is installed can be suppressed.

  In the fourth embodiment, the pressurizing device 7 is configured to pressurize the oil chamber 5 in addition to the air supply pipe 61. Thereby, since it is possible to suppress water from the pump chamber 4 to the oil chamber 5, it is not necessary to remove the pump casing and the oil casing and perform maintenance work. As a result, there is no need to have a spare pump to continue the operation, so that maintenance and management of the submersible electric pump 400 can be easily performed without requiring much labor and cost.

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

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, an example will be described in which a configuration in which the motor 1 and the oil chamber 5 are pressurized by the pressurizing device 7 is added to the configuration of the first embodiment.

  As shown in FIG. 5, the submersible electric pump 500 according to the fifth embodiment includes a submersible electric pump main body 501 arranged in water. The submersible electric pump main body 501 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, and an oil chamber 5. An air supply unit 6 is connected to the submersible electric pump main body 501. A pressure device 7 is connected to the air supply unit 6. In addition, the control unit 10 is connected to the submersible electric pump main body 501. The submersible electric pump main body 501 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the fifth embodiment, the pressurizing device 7 is configured to pressurize the motor 1 and the oil chamber 5 in addition to the air supply pipe 61. Specifically, the pressurizer 7 is connected to the motor 1 via a pipe 72 and a valve 72a. The pressurizing device 7 is connected to the oil chamber 5 through a pipe 73 and a valve 73a. The pressurizing device 7 is configured to be able to adjust the pressure applied to the motor 1 and the oil chamber 5. Further, the pressurizing device 7 is configured to pressurize the motor 1 and the oil chamber 5 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43. The pressurizing device 7 is configured to pressurize the motor 1 so that the pressure is about 1.21 times the water pressure detected by the pressure sensor 43 (about 1.1 times that of the oil chamber 5). Yes.

  Further, in the fifth embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  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, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 500 is installed at a deep water position, air containing oxygen can be prevented from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply air containing oxygen to the water, so that the decay of water in the pond or tank in which the submersible electric pump 500 is installed can be suppressed.

  In the fifth embodiment, the pressurizing device 7 is configured to pressurize both the motor 1 and the oil chamber 5 in addition to the air supply pipe 61. As a result, it is possible to suppress water from the pump chamber 4 to the oil chamber 5 and oil rise from the oil chamber 5 to the motor 1 side, so that it is necessary to remove the pump casing and the oil casing and perform maintenance work. Disappear. As a result, it is not necessary to have a spare pump to continue operation, so that maintenance and management of the submersible electric pump 500 can be easily performed without requiring much labor and cost for maintenance.

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

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIG. In the sixth embodiment, an example in which a configuration in which the motor 1 is pressurized by the pressurizing device 7 is further added to the configuration of the second embodiment will be described.

  As shown in FIG. 6, the submersible electric pump 600 according to the sixth embodiment includes a submersible electric pump main body 601 arranged in water. The submersible electric pump main body 601 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and an oil reservoir 8. An air supply unit 6 is connected to the submersible electric pump main body 601. A pressure device 7 is connected to the air supply unit 6. In addition, the control unit 10 is connected to the submersible electric pump main body 601. The submersible electric pump main body 601 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the sixth embodiment, the pressurizing device 7 is configured to pressurize the motor 1 in addition to the air supply pipe 61. Specifically, the pressurizer 7 is connected to the motor 1 via a pipe 72 and a valve 72a. The pressurizing device 7 is configured to be able to adjust the pressure applied to the motor 1. The pressurizing device 7 is configured to pressurize the motor 1 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the motor 1 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43.

  Further, in the sixth embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  The remaining configuration of the sixth embodiment is similar to that of the aforementioned second embodiment.

(Effect of 6th Embodiment)
In the sixth embodiment, the following effects can be obtained.

  In the sixth embodiment, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 600 is installed at a deep water position, it is possible to suppress the air containing oxygen from being repelled by the water pressure, so that the air containing oxygen can be discharged together with water. As a result, it is possible to supply air containing oxygen to the water, so that the decay of water in the pond or tank in which the submersible electric pump 600 is installed can be suppressed.

  In the sixth embodiment, the pressurizing device 7 is configured to pressurize the motor 1 in addition to the air supply pipe 61. Thereby, since it can suppress that oil rises from the oil storage part 8 to the motor 1 side, it becomes unnecessary to remove a pump casing, an oil casing, etc., and to perform a maintenance operation | work. As a result, there is no need to have a spare pump to continue the operation, so that maintenance and management of the submersible electric pump 600 can be easily performed without requiring much labor and cost.

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

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment, an example will be described in which a configuration in which the oil storage unit 8 is pressurized by the pressurizing device 7 is further added to the configuration of the second embodiment.

  As shown in FIG. 7, the submersible electric pump 700 according to the seventh embodiment includes a submersible electric pump main body 701 disposed in water. The submersible electric pump main body 701 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and an oil reservoir 8. An air supply unit 6 is connected to the submersible electric pump main body 701. A pressure device 7 is connected to the air supply unit 6. Further, the control unit 10 is connected to the submersible electric pump main body 701. The submersible electric pump main body 701 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the seventh embodiment, the pressurizer 7 is configured to pressurize the oil reservoir 8 in addition to the air supply pipe 61. Specifically, the pressurizer 7 is connected to the oil reservoir 8 via a pipe 74 and a valve 74a. The pressurizing device 7 is configured to be able to adjust the pressure applied to the oil reservoir 8. The pressurizing device 7 is configured to pressurize the oil reservoir 8 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the oil reservoir 8 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43.

  Further, in the seventh embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  The remaining configuration of the seventh embodiment is similar to that of the aforementioned second embodiment.

(Effect of 7th Embodiment)
In the seventh embodiment, the following effects can be obtained.

  In the seventh embodiment, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 700 is installed at a deep water position, air containing oxygen can be suppressed from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, since the air containing oxygen can be supplied to the water, the decay of water in the pond or tank in which the submersible electric pump 700 is installed can be suppressed.

  In the seventh embodiment, the pressurizing device 7 is configured to pressurize the oil reservoir 8 in addition to the air supply pipe 61. As a result, oil rising from the oil chamber 5 to the oil reservoir 8 can be suppressed, so that it is not necessary to perform maintenance work by removing the pump casing, the oil casing, and the like. As a result, it is not necessary to have a spare pump to continue the operation, and therefore maintenance and management of the submersible electric pump 700 can be easily performed without requiring much labor and cost for maintenance.

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

[Eighth Embodiment]
Next, an eighth embodiment of the present invention will be described with reference to FIG. In the eighth embodiment, an example will be described in which a configuration in which the oil chamber 5 is pressurized by the pressurizing device 7 is further added to the configuration of the second embodiment.

  As shown in FIG. 8, the submersible electric pump 800 according to the eighth embodiment includes a submersible electric pump main body 801 disposed in water. The submersible electric pump main body 801 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and an oil reservoir 8. An air supply unit 6 is connected to the submersible electric pump main body 801. A pressure device 7 is connected to the air supply unit 6. In addition, the control unit 10 is connected to the submersible electric pump main body 801. The submersible electric pump main body 801 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the eighth embodiment, the pressurizing device 7 is configured to pressurize the oil chamber 5 in addition to the air supply pipe 61. Specifically, the pressurizing device 7 is connected to the oil chamber 5 via a pipe 73 and a valve 73a. The pressurizing device 7 is configured to be able to adjust the pressure applied to the oil chamber 5. The pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43.

  In the eighth embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  The remaining configuration of the eighth embodiment is similar to that of the aforementioned second embodiment.

(Effect of 8th Embodiment)
In the eighth embodiment, the following effects can be obtained.

  In the eighth embodiment, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. As a result, even when the submersible electric pump 800 is installed at a deep water position, air containing oxygen can be suppressed from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply oxygen-containing air to the water, so that the water in the pond or tank in which the submersible electric pump 800 is installed can be prevented from decaying.

  In the eighth embodiment, the pressurizing device 7 is configured to pressurize the oil chamber 5 in addition to the air supply pipe 61. Thereby, since it is possible to suppress water from the pump chamber 4 to the oil chamber 5, it is not necessary to remove the pump casing and the oil casing and perform maintenance work. As a result, there is no need to have a spare pump to continue the operation, and therefore maintenance and management of the submersible electric pump 800 can be easily performed without requiring much labor and cost for maintenance.

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

[Ninth Embodiment]
Next, a ninth embodiment of the present invention will be described with reference to FIG. In the ninth embodiment, an example in which a configuration in which the oil chamber 5 and the oil storage unit 8 are pressurized by the pressurizing device 7 is further added to the configuration of the second embodiment will be described.

  As shown in FIG. 9, the submersible electric pump 900 according to the ninth embodiment includes a submersible electric pump main body 901 arranged in water. The submersible electric pump main body 901 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and an oil reservoir 8. An air supply unit 6 is connected to the submersible electric pump main body 901. A pressure device 7 is connected to the air supply unit 6. The control unit 10 is connected to the submersible electric pump main body 901. The submersible electric pump main body 901 is a vertical submersible electric pump in which the rotary shaft 2 extends in the vertical direction.

  Here, in the ninth embodiment, the pressurizer 7 is configured to pressurize the oil chamber 5 and the oil reservoir 8 in addition to the air supply pipe 61. Specifically, the pressurizing device 7 is connected to the oil chamber 5 via a pipe 73 and a valve 73a. The pressurizing device 7 is connected to the oil reservoir 8 via a pipe 74 and a valve 74a. Moreover, the pressurization apparatus 7 is comprised so that adjustment of the pressure added to the oil chamber 5 and the oil storage part 8 is possible respectively. Further, the pressurizing device 7 is configured to pressurize the oil chamber 5 and the oil reservoir 8 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43. The pressurizing device 7 is configured to pressurize the oil reservoir 8 so that the pressure is about 1.21 times the water pressure detected by the pressure sensor 43 (about 1.1 times that of the oil chamber 5). Has been.

  Further, in the ninth embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  The remaining configuration of the ninth embodiment is similar to that of the aforementioned second embodiment.

(Effect of 9th Embodiment)
In the ninth embodiment, the following effects can be obtained.

  In the ninth embodiment, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 900 is installed at a deep water position, air containing oxygen can be suppressed from being repelled by water pressure, so that air containing oxygen can be discharged together with water. As a result, it is possible to supply water containing oxygen to the water, so that the decay of water in the pond or tank in which the submersible electric pump 900 is installed can be suppressed.

  In the ninth embodiment, the pressurizer 7 is configured to pressurize the oil chamber 5 and the oil reservoir 8 in addition to the air supply pipe 61. As a result, it is possible to prevent water from entering the oil chamber 5 from the pump chamber 4 and oil rising from the oil chamber 5 to the oil reservoir 8, so it is necessary to remove the pump casing and the oil casing and perform maintenance work. Disappears. As a result, it is not necessary to have a spare pump to continue the operation, and therefore, maintenance and management of the submersible electric pump 900 can be easily performed without requiring much labor and cost for maintenance.

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

[Tenth embodiment]
Next, a tenth embodiment of the present invention will be described with reference to FIG. In the tenth embodiment, an example will be described in which a configuration in which the motor 1, the oil chamber 5, and the oil reservoir 8 are pressurized by the pressurizing device 7 is added to the configuration of the second embodiment.

  As shown in FIG. 10, the submersible electric pump 1000 according to the tenth embodiment includes a submersible electric pump main body 1001 arranged in water. The submersible electric pump main body 1001 includes a motor 1, a rotating shaft 2, an impeller 3, a pump chamber 4, an oil chamber 5, and an oil reservoir 8. An air supply unit 6 is connected to the submersible electric pump main body 1001. A pressure device 7 is connected to the air supply unit 6. In addition, the control unit 10 is connected to the submersible electric pump main body 1001. The submersible electric pump main body 1001 is a vertical submersible electric pump in which the rotating shaft 2 extends in the vertical direction.

  Here, in the tenth embodiment, the pressurizer 7 is configured to pressurize the motor 1, the oil chamber 5, and the oil reservoir 8 in addition to the air supply pipe 61. Specifically, the pressurizer 7 is connected to the motor 1 via a pipe 72 and a valve 72a. The pressurizing device 7 is connected to the oil chamber 5 through a pipe 73 and a valve 73a. The pressurizing device 7 is connected to the oil reservoir 8 via a pipe 74 and a valve 74a. Moreover, the pressurization apparatus 7 is comprised so that adjustment of the pressure added to the motor 1, the oil chamber 5, and the oil storage part 8 is possible respectively. The pressurizing device 7 is configured to pressurize the motor 1, the oil chamber 5, and the oil reservoir 8 so that the pressure is equal to or higher than the water pressure detected by the pressure sensor 43. For example, the pressurizing device 7 is configured to pressurize the oil chamber 5 so that the pressure is about 1.1 times the water pressure detected by the pressure sensor 43. The pressurizing device 7 is configured to pressurize the oil reservoir 8 so that the pressure is about 1.21 times the water pressure detected by the pressure sensor 43 (about 1.1 times that of the oil chamber 5). Has been. Further, the pressurizing device 7 is configured to pressurize the motor 1 so that the pressure is about 1.33 times the water pressure detected by the pressure sensor 43 (about 1.1 times that of the oil reservoir 8). ing.

  Further, in the tenth embodiment, the control unit 10 is configured to pressurize the air containing oxygen supplied from the air supply pipe 61 by the pressurizing device 7 based on the detection result of the pressure sensor 43.

  The remaining configuration of the tenth embodiment is similar to that of the aforementioned second embodiment.

(Effect of 10th Embodiment)
In the tenth embodiment, the following effects can be obtained.

  In the tenth embodiment, similarly to the first embodiment, air including oxygen supplied from the air supply pipe 61 is pressurized by the pressurizer 7 based on the detection result of the pressure sensor 43. Thereby, even when the submersible electric pump 1000 is installed at a deep position, it is possible to suppress the air containing oxygen from being repelled by the water pressure, so that the air containing oxygen can be discharged together with water. As a result, since the air containing oxygen can be supplied to the water, the decay of water in the pond or tank in which the submersible electric pump 1000 is installed can be suppressed.

  In the tenth embodiment, the pressurizing device 7 is configured to pressurize the motor 1, the oil chamber 5, and the oil reservoir 8 in addition to the air supply pipe 61. As a result, it is possible to suppress water from the pump chamber 4, oil rising from the oil chamber 5 to the oil reservoir 8, and oil rising from the oil reservoir 8 to the motor 1 side. There is no need to remove the casing and perform maintenance work. As a result, it is not necessary to have a spare pump to continue the operation, so that maintenance and management of the submersible electric pump 1000 can be easily performed without requiring much labor and cost for maintenance.

  The remaining effects of the tenth 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 to tenth embodiments, the example in which the present invention is applied to the vertical submersible electric pump arranged so that the rotation axis extends in the vertical direction is shown, but the present invention is not limited to this. You may apply this invention to the horizontal submersible electric pump arrange | positioned so that a rotating shaft may extend in a horizontal direction.

  Moreover, although the said 1st-10th embodiment showed the example of the structure which uses a compressor as a pressurization apparatus, this invention is not limited to this. In the present invention, a device other than the compressor may be used as the pressurizing device.

  In the first to tenth embodiments, the pressurization device applies air containing oxygen supplied from the air supply pipe so that the pressure is about 1.1 times the water pressure detected by the pressure sensor. Although the example of the structure which presses was shown, this invention is not restricted to this. In the present invention, the pressurizing device may pressurize the air containing oxygen supplied from the air supply pipe so as to have a pressure other than about 1.1 times the water pressure detected by the pressure sensor.

  Moreover, in the said 1st-10th embodiment, the example of the structure which pressurizes the air containing the oxygen supplied from an air supply pipe | tube more than the water pressure of a pump chamber by a pressurization apparatus based on the detection result of a pressure sensor. Although shown, the present invention is not limited to this. In the present invention, as long as the air containing oxygen supplied to the air supply pipe becomes larger than the pressure of the portion mixed with water, the air pressure may be increased below the water pressure in the pump chamber.

  Moreover, in the said 9th Embodiment, although the pressurization apparatus showed the example of the structure which pressurizes an oil chamber and an oil storage part in addition to an air supply pipe | tube, this invention is not limited to this. In the present invention, the pressurizer may pressurize the motor and the oil chamber in addition to the air supply pipe, or the pressurizer may pressurize the motor and the oil reservoir in addition to the air supply pipe. Good.

DESCRIPTION OF SYMBOLS 1 Motor 3 Impeller 4 Pump chamber 5 Oil chamber 7 Pressurization device 8 Oil storage part 42 Discharge port 43 Pressure sensor 52, 54 Mechanical seal 61 Air supply pipe 62 Reduction part 65 Switching part 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 Submersible electric pump

Claims (8)

A motor,
An impeller driven by the motor is disposed, and a pump chamber including a water discharge port;
An air supply pipe for supplying air containing oxygen to water discharged from the discharge port;
A pressurizing device connected to the air supply pipe and pressurizing air containing oxygen supplied from the air supply pipe;
A pressure sensor for detecting the water pressure in the pump chamber,
A submersible electric pump configured to pressurize air containing oxygen supplied from the air supply pipe by the pressurizing device based on a detection result of the pressure sensor.   The air containing oxygen supplied from the air supply pipe based on the detection result of the pressure sensor is configured to pressurize the air above the water pressure of the pump chamber by the pressurizing device. Submersible electric pump.   3. The apparatus according to claim 1, wherein, based on a detection result of the pressure sensor, when the water pressure in the pump chamber is equal to or lower than a predetermined value, air including oxygen is supplied from the air supply pipe by natural intake. The submersible electric pump described in 1. The discharge port is connected to a reduced portion that narrows the flow path of water,
The submersible electric pump according to claim 3, wherein the air supply pipe is connected in the vicinity of the reduced portion.   The apparatus further comprises a switching unit that switches a supply path of air containing oxygen to the air supply pipe according to a state in which the air supply pipe is pressurized and a state in which natural intake is performed from the air supply pipe. 4. The submersible electric pump according to 4. A mechanical seal having a sliding portion is provided, and further comprises an oil chamber disposed between the motor and the pump chamber,
The submersible electric pump according to any one of claims 1 to 5, wherein the pressurizing device is configured to pressurize at least one of the motor and the oil chamber in addition to the air supply pipe. . An oil chamber provided with a mechanical seal having a sliding portion, and disposed between the motor and the pump chamber;
An oil reservoir disposed between the motor and the oil chamber;
6. The pressurizing device according to claim 1, wherein the pressurizing device is configured to pressurize at least one of the motor, the oil chamber, and the oil reservoir in addition to the air supply pipe. The submersible electric pump according to one item.   The submersible electric pump according to claim 6 or 7, wherein the mechanical seal is provided at least on the pump chamber side of the oil chamber.

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