US20190203724A1 - Pump apparatus - Google Patents
Pump apparatus Download PDFInfo
- Publication number
- US20190203724A1 US20190203724A1 US16/225,887 US201816225887A US2019203724A1 US 20190203724 A1 US20190203724 A1 US 20190203724A1 US 201816225887 A US201816225887 A US 201816225887A US 2019203724 A1 US2019203724 A1 US 2019203724A1
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- United States
- Prior art keywords
- pump
- fluid
- handled
- motor stator
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0653—Units comprising pumps and their driving means the pump being electrically driven the motor being flooded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0666—Units comprising pumps and their driving means the pump being electrically driven the motor being of the plane gap type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/16—Pumping installations or systems with storage reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0077—Safety measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
- F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
- F04D15/0236—Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
- F04D15/0281—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition not otherwise provided for
Definitions
- the present technology relates to a pump apparatus.
- a handled-fluid (heated medium) used for cooling or regulating the temperature of an external apparatus is circulated between a tank in which the handled-fluid is stored and a heat exchange part of the external apparatus using a pump.
- JP 2005-330901 A discloses a vertical multistage pump in which a motor section of the pump is mounted to an upper part of a tank.
- the handled-fluid (heated medium)
- the handled-fluid itself is expensive.
- a gas detector for detecting toxic gas used in manufacturing processes is mounted in semiconductor manufacturing facilities, and leakage of the handled-fluid sometimes causes the gas detector to make a false detection. Accordingly, there are cases in which a canned motor pump, which will not leak fluid, is used for the pump that circulates handled-fluid.
- canned motor pumps have a structure whereby heat generated by the motor is cooled by the handled-fluid, in cases in which the circulation temperature of the handled-fluid is comparatively high and the like, the temperature of the motor rises. Accordingly, fluid circulation or air purging for forcibly cooling the motor from the outside is sometimes necessary, and the overall apparatus tends to be further increased in size.
- FIG. 1 is a schematic diagram illustrating a configuration of a pump apparatus according to a first embodiment
- FIG. 2 is an enlarged cross-sectional diagram illustrating a pump of the pump apparatus illustrated in FIG. 1 ;
- FIG. 3 is a plan view of the pump illustrated in FIG. 2 as viewed from an intake side;
- FIG. 4 is a schematic diagram illustrating a configuration of a pump apparatus according to a second embodiment.
- the overall apparatus can be made more compact. Further, since the motor casing is open and the windings of the motor stator are immersed in the handled-fluid in the tank, the windings can be directly cooled by the handled-fluid, and the efficiency by which the windings are cooled is improved. Thus, since increases in the temperature of the windings can be reduced, it is possible to increase pump performance and raise an upper limit for handled-fluid temperature.
- a casing body can be simplified due to, for example, conventional motor casing parts and the waterproof connector used at the power supply connection becoming unnecessary, and costs are able to be reduced. Further, in comparison to conventional cases in which a motor is cooled by the flow of air, air purging is unnecessary, and so an energy-saving effect is obtained, the apparatus can be made more compact, the number of components such as cooling fins and manifolds can be cut, and the overall apparatus is able to be simplified due to, for example, airflow control becoming unnecessary.
- a pump apparatus is the pump apparatus according to the first aspect, wherein
- a guide is disposed on an intake side of the pump, the guide guiding the handled-fluid such that the handled-fluid passes through a position where the motor casing is open.
- the handled-fluid is guided by the guide so as to pass through the position where the motor casing is open, and in the vicinity of the windings of the motor stator, even if the temperature of the handled-fluid increases due to heat generated by the windings, since the handled-fluid with the increased temperature does not stay in this location, the efficiency by which the windings are cooled by the handled-fluid can be raised even further.
- a pump apparatus is the pump apparatus according to the first aspect or the second aspect, wherein
- an intake port of the pump is disposed at a higher height position than the motor stator.
- a state can be maintained in which the windings of the motor stator are immersed in the handled-fluid and are directly cooled while the pump is running normally.
- a pump apparatus is the pump apparatus according to the third aspect, further including:
- a controller that monitors current supplied to the motor stator, and in cases in which the current supplied to the motor stator falls below a prescribed threshold, the controller performs at least one operation out of stopping the supply of current to the motor stator or issuing an alert.
- FIG. 1 is a schematic diagram illustrating the configuration of a pump apparatus 1 according to a first embodiment. As illustrated in FIG. 1 , the pump apparatus 1 is provided with a tank 10 , and with a pump 20 that is mounted in the tank 10 .
- a handled-fluid 11 that has insulating properties is stored in the tank 10 .
- a fluorine-based insulating fluid (specifically, for example, Fluorinert (registered trademark)) is, for example, employed as the handled-fluid 11 .
- a feed pipe 14 is inserted and installed in a lower side wall of the tank 10 , and a discharge pipe 20 c of the pump 20 is connected to the feed pipe 14 via a fitting 15 .
- a union fitting or a ferrule fitting is preferable employed as the fitting 15 .
- Handled-fluid 11 discharged from the discharge pipe 20 c of the pump 20 is fed through the feed pipe 14 and to a non-illustrated external apparatus.
- a return pipe 13 is inserted and installed in the ceiling of the tank 10 .
- Handled-fluid 11 that has passed through the non-illustrated external apparatus so as to perform heat exchange returns through the return pipe 13 to the inside of the tank 10 , where the handled-fluid 11 is stored.
- FIG. 2 is an enlarged cross-sectional diagram illustrating the pump 20 mounted in the tank 10 .
- the pump 20 has an impeller 21 in which magnets (permanent magnets) 22 are embedded, a motor stator 23 that is disposed at a position opposing the magnets 22 , a pump casing 24 that houses the impeller 21 , and a motor casing 25 that houses the motor stator 23 .
- Fluid-contacting parts of the pump casing 24 and the motor casing 25 are formed from a material that is resistant to the handled-fluid 11 , for example a resin such as polyphenylene sulfide (PPS) or a polyether ether ketone (PEEK).
- PPS polyphenylene sulfide
- PEEK polyether ether ketone
- the motor stator 23 and the motor casing 25 are disposed on an intake side of the impeller 21 , and the motor casing 25 defines an intake port 20 a .
- a bearing assembly 26 is disposed between the motor casing 25 and the impeller 21 . The bearing assembly 26 supports radial loading and thrust loading from the impeller 21 .
- a respective fluid flow path is formed in a central part of each of the motor casing 25 and the bearing assembly 26 .
- the fluid flow paths are joined in series so as to configure a single fluid flow path extending from the intake port 20 a to a fluid inlet of the impeller 21 .
- the fluid flow paths are in communication with the fluid inlet of the impeller 21 .
- the pump 20 is a pump equipped with an axial-gap PM motor, in which the magnets 22 and the motor stator 23 are disposed along the fluid flow paths.
- the discharge pipe 20 c which has a discharge port 20 b , is provided in a side face of the pump casing 24 . Fluid having increased pressure due to the rotating impeller 21 is discharged through the discharge pipe 20 c and from the discharge port 20 b .
- the pump 20 according to the present embodiment is what is known as an end-top pump, in which the intake port 20 a and the discharge port 20 b are orthogonal to one another.
- the impeller 21 is formed from a nonmagnetic material that slides easily, is not susceptible to wear, and that is resistant to the handled-fluid 11 .
- a resin such as polyphenylene sulfide (PPS) or a polyether ether ketone (PEEK), or a ceramic, is suited to be employed as the material of the impeller 21 .
- the pump casing 24 and the motor casing 25 can also be formed from the same material as the impeller 21 .
- the impeller 21 is rotatably supported by the single bearing assembly 26 .
- the bearing assembly 26 is a slide bearing (dynamic pressure bearing) that makes use of fluid dynamic pressure.
- the bearing assembly 26 is configured by a combination of a rotating-side bearing 26 a and a stationary-side bearing 26 b that loosely engage with one another.
- the rotating-side bearing 26 a is fixed to the impeller 21 , and is disposed so as to surround the fluid inlet of the impeller 21 .
- the stationary-side bearing 26 b is fixed to the motor casing 25 , and is disposed on the intake side of the rotating-side bearing 26 a .
- the stationary-side bearing 26 b has a cylindrical part that extends along an axial direction of the rotating-side bearing 26 a , and a flange that projects outward from the cylindrical part.
- the cylindrical part of the stationary-side bearing 26 b has a radial face that supports radial loading from the impeller 21
- the flange of the stationary-side bearing 26 b has a thrust face that supports thrust loading from the impeller 21 .
- the radial face is parallel to the axis of the impeller 21
- the thrust face is perpendicular to the axis of the impeller 21 .
- the rotating-side bearing 26 a is disposed around the cylindrical part of the stationary-side bearing 26 b.
- Some of the handled-fluid 11 that is discharged from the impeller 21 passes is introduced into the bearing assembly 26 through a small gap between the impeller 21 and the motor casing 25 .
- the rotating-side bearing 26 a rotates together with the impeller 21
- fluid dynamic pressure arises between the rotating-side bearing 26 a and the stationary-side bearing 26 b , whereby the impeller 21 is supported by the bearing assembly 26 in a state of non-contact therewith.
- the stationary-side bearing 26 b supports the rotating-side bearing 26 a using the radial face and the thrust face that are orthogonal to one another, tilting of the impeller 21 is restricted by the bearing assembly 26 .
- the motor stator 23 has a core 23 a and a plurality of windings (coils) 23 b .
- the plurality of windings 23 b are disposed in a ring shape.
- the impeller 21 and the motor stator 23 are disposed concentrically to the bearing assembly 26 and the intake port 20 a.
- Lead wires 23 c are connected to the windings 23 b of the motor stator 23 via a wiring substrate 23 d .
- a power supply connector 12 is attached to an upper side wall of the tank 10 , and the windings 23 b of the motor stator 23 are electrically connected to an inverter device 3 via the lead wires 23 c , the wiring substrate 23 d , and the power supply connector 12 .
- the inverter device 3 is also connected to a control device (controller) 4 that controls operation of the inverter device 3 .
- the inverter device 3 supplies current to the windings 23 b of the motor stator 23 so as to cause the motor stator 23 to generate a rotating magnetic field.
- the rotating magnetic field acts on the magnets 22 embedded in the impeller 21 , and rotationally drives the impeller 21 .
- the torque of the impeller 21 depends on the magnitude of the current supplied to the motor stator 23 . So long as the load exerted on the impeller 21 is constant, the current supplied to the motor stator 23 is substantially constant.
- the handled-fluid 11 stored in the tank 10 is introduced into the fluid inlet of the impeller 21 through the intake port 20 a .
- the handled-fluid 11 has increased pressure due to rotation of the impeller 21 , and the handled-fluid 11 is discharged from the discharge port 20 b .
- the back face of the impeller 21 is pushed toward the intake side (namely, toward the intake port 20 a ) by fluid having increased pressure.
- the bearing assembly 26 is disposed on the intake side of the impeller 21 , and so the bearing assembly 26 supports thrust loading from the impeller 21 from the intake side.
- the motor casing 25 is open such that the windings 23 b of the motor stator 23 are immersed in the handled-fluid 11 .
- Reference numeral 25 a indicates the opening in the motor casing 25 .
- the motor casing 25 is open on the intake side (the upper side in the drawings) of the pump 20 .
- FIG. 3 is a plan view of the pump 20 as viewed from the intake side.
- reference numeral 25 a 1 indicates an inner circumference of the opening 25 a in the motor casing 25
- reference numeral 25 a 2 indicates an outer circumference of the opening 25 a in the motor casing 25
- the region between the inner circumference 25 a 1 and the outer circumference 25 a 2 is the opening 25 a .
- the wiring substrate 23 d for wiring the lead wires 23 c extending from the power supply connector 12 to the windings 23 b is disposed in the opening 25 a in the motor casing 25 , and a plurality of notches 23 e are formed in each of an outer circumferential edge and an inner circumferential edge of the wiring substrate 23 d .
- the plurality of notches 23 e are formed spaced apart (for example, at evenly spaced intervals) along a circumferential direction.
- the handled-fluid 11 stored in the tank 10 flows through the opening 25 a in the motor casing 25 , through the notches 23 e in the wiring substrate 23 d , into the motor casing 25 , and the windings 23 b are directly immersed in the handled-fluid 11 .
- the wiring substrate 23 d is not absolutely necessary, and the wiring substrate 23 d may be omitted, or the lead wires 23 c extending from the power supply connector 12 may be directly wired to the windings 23 b .
- the handled-fluid 11 stored in the tank 10 flows straight into the motor casing 25 through the opening 25 a in the motor casing 25 , and the windings 23 b are directly immersed in the handled-fluid 11 .
- the intake port 20 a of the pump 20 may be disposed at a higher height position than the motor stator 23 . This enables a state to be maintained in which the windings 23 b of the motor stator 23 are immersed in the handled-fluid 11 and are directly cooled while the pump 20 is being operated.
- a control device 4 that controls operation of the inverter device 3 monitors the current supplied to the motor stator 23 from the inverter device 3 , and in cases in which the current supplied to the motor stator 23 falls below a prescribed threshold, the control device 4 performs at least one operation out of stopping the supply of current to the motor stator 23 or issuing an alert.
- control device 4 decides whether or not the pump 20 is being run with an abnormal level of current, namely, in a dry state or in a state having insufficient fluid, on the basis of a rate of change in current and/or a change in current value. So long as the pump 20 is immersed in the handled-fluid 11 and the handled-fluid 11 is present in the pump 20 , a rate of change in current and/or a change in current value are effectively zero.
- prescribed threshold is a general term for a value indicated in the following (a number of times going under a reference value, a set value, a regulation value, a number of times going under a tolerance value or an amount of deviation, etc.).
- the control device 4 monitors the current supplied to the motor stator 23 , and calculates a rate of change in current for a prescribed time interval. In one embodiment, per prescribed time interval (for example, one month), the control device 4 may calculate a rate of change in current for this prescribed time interval.
- the control device 4 decides whether or not the pump 20 is being run with an abnormal level of current, namely, in a dry state or in a state having insufficient fluid, on the basis of the current supplied to the motor stator 23 .
- An abnormal level of current can, for example, be defined as follows. Namely, a value, such as an average value obtained from current values while the pump 20 was running normally, is set in advance as a reference value. Then, this reference value is employed to compute a rate of change in the current being supplied. When the value of this rate of change has gone negative a prescribed number of times, the control device 4 determines there to be an abnormal level of current. In one embodiment, the control device 4 may determine there to be an abnormal level of current in cases in which the rate of change in current has fallen below a prescribed set value.
- the control device 4 measures a current value over a prescribed amount of time, and the control device 4 may determine there to be an abnormal level of current in cases in which a value for a deviation between a past measurement value for current and a present measurement value for current has fallen below a prescribed regulation value. In such cases, rather than a rate of change in current, a change in current is computed. The change in current is the value for this deviation. In yet another embodiment, the control device 4 may determine there to be an abnormal level of current on the basis of the number of times the value for this deviation has fallen below a prescribed tolerance value, or on an amount of deviation.
- the regulation value and the tolerance value may be identical values, or may be different values to one another.
- the control device 4 transmits a control signal to the inverter device 3 and stops the supply of current to the motor stator 23 .
- control device 4 may issue an emergency alert and request an immediate response from supervising personnel.
- the overall apparatus can be made more compact. Further, since the motor casing 25 is open and the windings 23 b of the motor stator 23 are immersed in the handled-fluid 11 in the tank 10 , the windings 23 b can be directly cooled by the handled-fluid 11 , and the efficiency by which the windings 23 b are cooled is improved. Thus, since increases in the temperature of the windings 23 b can be reduced, it is possible to increase pump performance and raise an upper limit for handled-fluid temperature.
- a casing body can be simplified due to, for example, conventional motor casing parts and the waterproof connector used at the power supply connection becoming unnecessary, and costs are able to be reduced. Further, in comparison to conventional cases in which a motor is cooled by the flow of air, air purging is unnecessary, and so an energy-saving effect is obtained, the apparatus can be made more compact, the number of components such as cooling fins and manifolds can be cut, and the overall apparatus is able to be simplified due to, for example, airflow control becoming unnecessary.
- the intake port 20 a of the pump 20 is disposed at a higher height position than the motor stator 23 , a state can be maintained in which the windings 23 b of the motor stator 23 are immersed in the handled-fluid 11 and are directly cooling while the pump 20 is running normally.
- the control device 4 since the control device 4 monitors the current supplied to the motor stator 23 , and in cases in which the current supplied to the motor stator 23 falls below a prescribed threshold, the control device 4 performs at least one operation out of stopping the supply of current to the motor stator 23 or issuing an alert, in cases in which the windings 23 b are not immersed in the handled-fluid 11 and the windings 23 b cannot be efficiently cooled by the handled-fluid 11 , an excessive increase in the temperature of the windings 23 b when the pump 20 is continually run can be prevented.
- FIG. 4 is a schematic diagram illustrating the configuration of a pump apparatus 1 ′ according to a second embodiment.
- a guide 29 is disposed on the intake side of the pump 20 .
- the guide 29 guides the handled-fluid 11 such that the handled-fluid 11 passes through a position where the motor casing 25 is open.
- the guide 29 has a flat plate shape, is spaced above the intake port 20 a , and is disposed so as to face both the intake port 20 a and the opening 25 a of the motor casing 25 .
- the efficiency by which the windings 23 b are cooled by the handled-fluid 11 can be raised even further.
- the pump 20 is mounted in a vertical orientation (with the intake port 20 a pointing upward) in the tank 10 in the above embodiments, there is no limitation thereto, and depending on the shape of the tank 10 and the like, the pump 20 may be set in a horizontal orientation (with the intake port 20 a pointing sideways) in the tank 10 .
- control device 4 calculates a rate of change in the current supplied to the motor stator 23 , and in cases in which the current falls below a prescribed threshold and the pump 20 is judged to be in a state running empty, the control device 4 performs at least one operation out of stopping the supply of current to the motor stator 23 or issuing an alert, there is no limitation thereto.
- configuration may be such that the control device 4 monitors a measurement value from a non-illustrated flow rate sensor provided to the feed pipe 14 or the like, and in cases in which the flow rate falls below a prescribed threshold and the pump 20 is judged to be in a state running empty, the control device 4 , the control device 4 performs at least one operation out of stopping the supply of current to the motor stator 23 or issuing an alert.
- configuration may be such that the control device 4 monitors a measurement value from a non-illustrated water level sensor provided in the tank 10 , and in cases in which the water level in the tank 10 falls below a prescribed threshold (for example, the height position of the intake port 20 a ) and the pump 20 is judged to be in a state running empty, the control device 4 , the control device 4 performs at least one operation out of stopping the supply of current to the motor stator 23 or issuing an alert.
- a prescribed threshold for example, the height position of the intake port 20 a
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
A pump apparatus is provided with a tank in which a handled-fluid having insulating properties is stored, and with a pump that is mounted in the tank. The pump has an impeller in which a magnet is embedded, a motor stator that is disposed at a position opposing the magnet, a pump casing that houses the impeller, and a motor casing that houses the motor stator. The motor casing is open such that a winding of the motor stator is immersed in the handled-fluid.
Description
- This application claims the benefit of Japanese Priority Patent Application JP 2017-254071 filed on Dec. 28, 2017, the entire contents of which are incorporated herein by reference.
- The present technology relates to a pump apparatus.
- Conventionally, a handled-fluid (heated medium) used for cooling or regulating the temperature of an external apparatus such as semiconductor manufacturing apparatus is circulated between a tank in which the handled-fluid is stored and a heat exchange part of the external apparatus using a pump.
- This kind of pump is often mounted outside of the tank (to a side part or lower part the tank), and as a result, particularly in cases in which the pump is mounted at the side of the tank and the like, the overall apparatus tends to be increased in size. JP 2005-330901 A discloses a vertical multistage pump in which a motor section of the pump is mounted to an upper part of a tank.
- Further, in cases in which a fluorine-based insulating fluid is used as the handled-fluid (heated medium), the handled-fluid itself is expensive. In addition, a gas detector for detecting toxic gas used in manufacturing processes is mounted in semiconductor manufacturing facilities, and leakage of the handled-fluid sometimes causes the gas detector to make a false detection. Accordingly, there are cases in which a canned motor pump, which will not leak fluid, is used for the pump that circulates handled-fluid.
- However, since canned motor pumps have a structure whereby heat generated by the motor is cooled by the handled-fluid, in cases in which the circulation temperature of the handled-fluid is comparatively high and the like, the temperature of the motor rises. Accordingly, fluid circulation or air purging for forcibly cooling the motor from the outside is sometimes necessary, and the overall apparatus tends to be further increased in size.
- It is desirable to provide a pump apparatus that is capable of accommodating handled-fluid of a comparatively high temperature without increasing the size of the overall apparatus.
- A pump apparatus according to one embodiment includes:
- a tank in which a handled-fluid having insulating properties is stored; and
- a pump that is mounted in the tank, wherein
-
- the pump has
- an impeller in which a magnet is embedded,
- a motor stator that is disposed at a position opposing the magnet,
- a pump casing that houses the impeller, and
- a motor casing that houses the motor stator, and
- the motor casing is open such that a winding of the motor stator is immersed in the handled-fluid.
- the pump has
-
FIG. 1 is a schematic diagram illustrating a configuration of a pump apparatus according to a first embodiment; -
FIG. 2 is an enlarged cross-sectional diagram illustrating a pump of the pump apparatus illustrated inFIG. 1 ; -
FIG. 3 is a plan view of the pump illustrated inFIG. 2 as viewed from an intake side; and -
FIG. 4 is a schematic diagram illustrating a configuration of a pump apparatus according to a second embodiment. - A pump apparatus according to a first aspect of an embodiment includes:
- a tank in which a handled-fluid having insulating properties is stored; and
- a pump that is mounted in the tank, wherein
-
- the pump has
- an impeller in which a magnet is embedded,
- a motor stator that is disposed at a position opposing the magnet,
- a pump casing that houses the impeller, and
- a motor casing that houses the motor stator, and
- the motor casing is open such that a winding of the motor stator is immersed in the handled-fluid.
- the pump has
- According to this aspect, since the pump is mounted in the tank, the overall apparatus can be made more compact. Further, since the motor casing is open and the windings of the motor stator are immersed in the handled-fluid in the tank, the windings can be directly cooled by the handled-fluid, and the efficiency by which the windings are cooled is improved. Thus, since increases in the temperature of the windings can be reduced, it is possible to increase pump performance and raise an upper limit for handled-fluid temperature.
- Further, according to this aspect, a casing body can be simplified due to, for example, conventional motor casing parts and the waterproof connector used at the power supply connection becoming unnecessary, and costs are able to be reduced. Further, in comparison to conventional cases in which a motor is cooled by the flow of air, air purging is unnecessary, and so an energy-saving effect is obtained, the apparatus can be made more compact, the number of components such as cooling fins and manifolds can be cut, and the overall apparatus is able to be simplified due to, for example, airflow control becoming unnecessary.
- Moreover, according to this aspect, as a result of the pump being mounted in the tank and immersed in the handled-fluid, and of the tank serving a dual role as the casing body, noise is able to be reduced.
- A pump apparatus according to a second aspect of an embodiment is the pump apparatus according to the first aspect, wherein
- a guide is disposed on an intake side of the pump, the guide guiding the handled-fluid such that the handled-fluid passes through a position where the motor casing is open.
- According to this aspect, the handled-fluid is guided by the guide so as to pass through the position where the motor casing is open, and in the vicinity of the windings of the motor stator, even if the temperature of the handled-fluid increases due to heat generated by the windings, since the handled-fluid with the increased temperature does not stay in this location, the efficiency by which the windings are cooled by the handled-fluid can be raised even further.
- A pump apparatus according to a third aspect of an embodiment is the pump apparatus according to the first aspect or the second aspect, wherein
- an intake port of the pump is disposed at a higher height position than the motor stator.
- According to this aspect, a state can be maintained in which the windings of the motor stator are immersed in the handled-fluid and are directly cooled while the pump is running normally.
- A pump apparatus according to a fourth aspect of an embodiment is the pump apparatus according to the third aspect, further including:
- a controller that monitors current supplied to the motor stator, and in cases in which the current supplied to the motor stator falls below a prescribed threshold, the controller performs at least one operation out of stopping the supply of current to the motor stator or issuing an alert.
- According to this aspect, in cases in which the windings are not immersed in the handled-fluid and the windings cannot be efficiently cooled by the handled-fluid, an excessive increase in the temperature of the windings when the pump is continually run can be prevented.
- Detailed description follows regarding specific examples of embodiments, with reference to the accompanying drawings. Note that in the drawings accompanying the present specification, as appropriate, the scale, length and width, and other dimensional ratios are modified and exaggerated compared to those in actuality in order to facilitate understanding of the illustrations.
-
FIG. 1 is a schematic diagram illustrating the configuration of apump apparatus 1 according to a first embodiment. As illustrated inFIG. 1 , thepump apparatus 1 is provided with atank 10, and with apump 20 that is mounted in thetank 10. - A handled-
fluid 11 that has insulating properties is stored in thetank 10. A fluorine-based insulating fluid (specifically, for example, Fluorinert (registered trademark)) is, for example, employed as the handled-fluid 11. - In the example illustrated, a
feed pipe 14 is inserted and installed in a lower side wall of thetank 10, and adischarge pipe 20 c of thepump 20 is connected to thefeed pipe 14 via afitting 15. In order to facilitate pipe connection/disconnection in thetank 10, a union fitting or a ferrule fitting is preferable employed as the fitting 15. Handled-fluid 11 discharged from thedischarge pipe 20 c of thepump 20 is fed through thefeed pipe 14 and to a non-illustrated external apparatus. - A
return pipe 13 is inserted and installed in the ceiling of thetank 10. Handled-fluid 11 that has passed through the non-illustrated external apparatus so as to perform heat exchange returns through thereturn pipe 13 to the inside of thetank 10, where the handled-fluid 11 is stored. -
FIG. 2 is an enlarged cross-sectional diagram illustrating thepump 20 mounted in thetank 10. As illustrated inFIG. 2 , thepump 20 has animpeller 21 in which magnets (permanent magnets) 22 are embedded, amotor stator 23 that is disposed at a position opposing themagnets 22, apump casing 24 that houses theimpeller 21, and amotor casing 25 that houses themotor stator 23. Fluid-contacting parts of thepump casing 24 and themotor casing 25 are formed from a material that is resistant to the handled-fluid 11, for example a resin such as polyphenylene sulfide (PPS) or a polyether ether ketone (PEEK). - As illustrated in
FIG. 2 , themotor stator 23 and themotor casing 25 are disposed on an intake side of theimpeller 21, and themotor casing 25 defines anintake port 20 a. A bearingassembly 26 is disposed between themotor casing 25 and theimpeller 21. The bearingassembly 26 supports radial loading and thrust loading from theimpeller 21. - As illustrated in
FIG. 2 , a respective fluid flow path is formed in a central part of each of themotor casing 25 and the bearingassembly 26. The fluid flow paths are joined in series so as to configure a single fluid flow path extending from theintake port 20 a to a fluid inlet of theimpeller 21. The fluid flow paths are in communication with the fluid inlet of theimpeller 21. - The
pump 20 according to the present embodiment is a pump equipped with an axial-gap PM motor, in which themagnets 22 and themotor stator 23 are disposed along the fluid flow paths. - As illustrated in
FIG. 2 , thedischarge pipe 20 c, which has adischarge port 20 b, is provided in a side face of thepump casing 24. Fluid having increased pressure due to the rotatingimpeller 21 is discharged through thedischarge pipe 20 c and from thedischarge port 20 b. Note that thepump 20 according to the present embodiment is what is known as an end-top pump, in which theintake port 20 a and thedischarge port 20 b are orthogonal to one another. - The
impeller 21 is formed from a nonmagnetic material that slides easily, is not susceptible to wear, and that is resistant to the handled-fluid 11. For example, a resin such as polyphenylene sulfide (PPS) or a polyether ether ketone (PEEK), or a ceramic, is suited to be employed as the material of theimpeller 21. Thepump casing 24 and themotor casing 25 can also be formed from the same material as theimpeller 21. - The
impeller 21 is rotatably supported by thesingle bearing assembly 26. The bearingassembly 26 is a slide bearing (dynamic pressure bearing) that makes use of fluid dynamic pressure. The bearingassembly 26 is configured by a combination of a rotating-side bearing 26 a and a stationary-side bearing 26 b that loosely engage with one another. - The rotating-
side bearing 26 a is fixed to theimpeller 21, and is disposed so as to surround the fluid inlet of theimpeller 21. The stationary-side bearing 26 b is fixed to themotor casing 25, and is disposed on the intake side of the rotating-side bearing 26 a. The stationary-side bearing 26 b has a cylindrical part that extends along an axial direction of the rotating-side bearing 26 a, and a flange that projects outward from the cylindrical part. - The cylindrical part of the stationary-
side bearing 26 b has a radial face that supports radial loading from theimpeller 21, and the flange of the stationary-side bearing 26 b has a thrust face that supports thrust loading from theimpeller 21. The radial face is parallel to the axis of theimpeller 21, and the thrust face is perpendicular to the axis of theimpeller 21. The rotating-side bearing 26 a is disposed around the cylindrical part of the stationary-side bearing 26 b. - Some of the handled-
fluid 11 that is discharged from theimpeller 21 passes is introduced into the bearingassembly 26 through a small gap between theimpeller 21 and themotor casing 25. When the rotating-side bearing 26 a rotates together with theimpeller 21, fluid dynamic pressure arises between the rotating-side bearing 26 a and the stationary-side bearing 26 b, whereby theimpeller 21 is supported by the bearingassembly 26 in a state of non-contact therewith. Since the stationary-side bearing 26 b supports the rotating-side bearing 26 a using the radial face and the thrust face that are orthogonal to one another, tilting of theimpeller 21 is restricted by the bearingassembly 26. - The
motor stator 23 has a core 23 a and a plurality of windings (coils) 23 b. The plurality ofwindings 23 b are disposed in a ring shape. Theimpeller 21 and themotor stator 23 are disposed concentrically to the bearingassembly 26 and theintake port 20 a. - Lead
wires 23 c are connected to thewindings 23 b of themotor stator 23 via awiring substrate 23 d. Referring toFIG. 1 , apower supply connector 12 is attached to an upper side wall of thetank 10, and thewindings 23 b of themotor stator 23 are electrically connected to aninverter device 3 via thelead wires 23 c, thewiring substrate 23 d, and thepower supply connector 12. In addition to being connected to a power supply 2, theinverter device 3 is also connected to a control device (controller) 4 that controls operation of theinverter device 3. - The
inverter device 3 supplies current to thewindings 23 b of themotor stator 23 so as to cause themotor stator 23 to generate a rotating magnetic field. The rotating magnetic field acts on themagnets 22 embedded in theimpeller 21, and rotationally drives theimpeller 21. The torque of theimpeller 21 depends on the magnitude of the current supplied to themotor stator 23. So long as the load exerted on theimpeller 21 is constant, the current supplied to themotor stator 23 is substantially constant. - When the
impeller 21 rotates, the handled-fluid 11 stored in thetank 10 is introduced into the fluid inlet of theimpeller 21 through theintake port 20 a. The handled-fluid 11 has increased pressure due to rotation of theimpeller 21, and the handled-fluid 11 is discharged from thedischarge port 20 b. While theimpeller 21 is moving the handled-fluid 11, the back face of theimpeller 21 is pushed toward the intake side (namely, toward theintake port 20 a) by fluid having increased pressure. The bearingassembly 26 is disposed on the intake side of theimpeller 21, and so the bearingassembly 26 supports thrust loading from theimpeller 21 from the intake side. - In the present embodiment, as illustrated in
FIG. 1 andFIG. 2 , themotor casing 25 is open such that thewindings 23 b of themotor stator 23 are immersed in the handled-fluid 11.Reference numeral 25 a indicates the opening in themotor casing 25. Themotor casing 25 is open on the intake side (the upper side in the drawings) of thepump 20. -
FIG. 3 is a plan view of thepump 20 as viewed from the intake side. InFIG. 3 ,reference numeral 25 a 1 indicates an inner circumference of the opening 25 a in themotor casing 25, and reference numeral 25 a 2 indicates an outer circumference of the opening 25 a in themotor casing 25. The region between theinner circumference 25 a 1 and theouter circumference 25 a 2 is the opening 25 a. In the example illustrated inFIG. 3 , thewiring substrate 23 d for wiring thelead wires 23 c extending from thepower supply connector 12 to thewindings 23 b is disposed in theopening 25 a in themotor casing 25, and a plurality ofnotches 23 e are formed in each of an outer circumferential edge and an inner circumferential edge of thewiring substrate 23 d. The plurality ofnotches 23 e are formed spaced apart (for example, at evenly spaced intervals) along a circumferential direction. The handled-fluid 11 stored in thetank 10 flows through the opening 25 a in themotor casing 25, through thenotches 23 e in thewiring substrate 23 d, into themotor casing 25, and thewindings 23 b are directly immersed in the handled-fluid 11. - Note that the
wiring substrate 23 d is not absolutely necessary, and thewiring substrate 23 d may be omitted, or thelead wires 23 c extending from thepower supply connector 12 may be directly wired to thewindings 23 b. In such cases, the handled-fluid 11 stored in thetank 10 flows straight into themotor casing 25 through the opening 25 a in themotor casing 25, and thewindings 23 b are directly immersed in the handled-fluid 11. - When current flows into the
windings 23 b of themotor stator 23 when thepump 20 is run, heat is generated due to the electrical resistance of thewindings 23 b. However, in the present embodiment, since themotor casing 25 is open and thewindings 23 b of themotor stator 23 are immersed in the handled-fluid 11 in thetank 10, thewindings 23 b can be directly cooled by the handled-fluid 11, and thewindings 23 b can be efficiently cooled. Note that in the present embodiment, since the handled-fluid 11 is a fluid that has electrically insulating properties, thewindings 23 b are not shorted together by immersion in the handled-fluid 11. - As illustrated in
FIG. 1 andFIG. 2 , theintake port 20 a of thepump 20 may be disposed at a higher height position than themotor stator 23. This enables a state to be maintained in which thewindings 23 b of themotor stator 23 are immersed in the handled-fluid 11 and are directly cooled while thepump 20 is being operated. - Referring to
FIG. 1 , a control device 4 that controls operation of theinverter device 3 monitors the current supplied to themotor stator 23 from theinverter device 3, and in cases in which the current supplied to themotor stator 23 falls below a prescribed threshold, the control device 4 performs at least one operation out of stopping the supply of current to themotor stator 23 or issuing an alert. - For example, the control device 4 decides whether or not the
pump 20 is being run with an abnormal level of current, namely, in a dry state or in a state having insufficient fluid, on the basis of a rate of change in current and/or a change in current value. So long as thepump 20 is immersed in the handled-fluid 11 and the handled-fluid 11 is present in thepump 20, a rate of change in current and/or a change in current value are effectively zero. - If the
pump 20 is run in a dry state or in a state having insufficient fluid (run empty), the current supplied to themotor stator 23 is reduced. The control device 4 makes a comparison between a rate of change in current and/or a change in current value and a prescribed threshold. Herein, prescribed threshold is a general term for a value indicated in the following (a number of times going under a reference value, a set value, a regulation value, a number of times going under a tolerance value or an amount of deviation, etc.). - More specifically, when the
pump 20 is run in a dry state or in a state having insufficient fluid, since the motive power of thepump 20 is reduced, the current supplied to themotor stator 23 from theinverter device 3 is reduced. Namely, in cases in which no fluid is present in thepump 20, since minimal load is exerted on theimpeller 21, minimal current is supplied to themotor stator 23. Thus, the control device 4 monitors the current supplied to themotor stator 23, and calculates a rate of change in current for a prescribed time interval. In one embodiment, per prescribed time interval (for example, one month), the control device 4 may calculate a rate of change in current for this prescribed time interval. - Then, the control device 4 decides whether or not the
pump 20 is being run with an abnormal level of current, namely, in a dry state or in a state having insufficient fluid, on the basis of the current supplied to themotor stator 23. An abnormal level of current can, for example, be defined as follows. Namely, a value, such as an average value obtained from current values while thepump 20 was running normally, is set in advance as a reference value. Then, this reference value is employed to compute a rate of change in the current being supplied. When the value of this rate of change has gone negative a prescribed number of times, the control device 4 determines there to be an abnormal level of current. In one embodiment, the control device 4 may determine there to be an abnormal level of current in cases in which the rate of change in current has fallen below a prescribed set value. - In another embodiment, after the
pump 20 starts running, the control device 4 measures a current value over a prescribed amount of time, and the control device 4 may determine there to be an abnormal level of current in cases in which a value for a deviation between a past measurement value for current and a present measurement value for current has fallen below a prescribed regulation value. In such cases, rather than a rate of change in current, a change in current is computed. The change in current is the value for this deviation. In yet another embodiment, the control device 4 may determine there to be an abnormal level of current on the basis of the number of times the value for this deviation has fallen below a prescribed tolerance value, or on an amount of deviation. The regulation value and the tolerance value may be identical values, or may be different values to one another. - In cases in which a rate of change in current and/or a change in current value exceeds a prescribed threshold and then is reduced, the control device 4 transmits a control signal to the
inverter device 3 and stops the supply of current to themotor stator 23. Thereby, in a state in which thepump 20 is not immersed in the handled-fluid 11, namely, in a state in which thewindings 23 b of themotor stator 23 cannot be directly cooled by the handled-fluid 11, an excessive increase in temperature due to heat generated by thewindings 23 b when current is supplied to themotor stator 23 can be prevented. - Further, in cases in which a rate of change in current and/or a change in current value exceeds the prescribed threshold and is then reduced, in addition to stopping current supply to the
motor stator 23, or in place thereof, the control device 4 may issue an emergency alert and request an immediate response from supervising personnel. - According to the present embodiment as described above, since the
pump 20 is mounted in thetank 10, the overall apparatus can be made more compact. Further, since themotor casing 25 is open and thewindings 23 b of themotor stator 23 are immersed in the handled-fluid 11 in thetank 10, thewindings 23 b can be directly cooled by the handled-fluid 11, and the efficiency by which thewindings 23 b are cooled is improved. Thus, since increases in the temperature of thewindings 23 b can be reduced, it is possible to increase pump performance and raise an upper limit for handled-fluid temperature. - Further, according to the present embodiment, a casing body can be simplified due to, for example, conventional motor casing parts and the waterproof connector used at the power supply connection becoming unnecessary, and costs are able to be reduced. Further, in comparison to conventional cases in which a motor is cooled by the flow of air, air purging is unnecessary, and so an energy-saving effect is obtained, the apparatus can be made more compact, the number of components such as cooling fins and manifolds can be cut, and the overall apparatus is able to be simplified due to, for example, airflow control becoming unnecessary.
- Further, according to the present embodiment, as a result of the
pump 20 being mounted in thetank 10 and immersed in the handled-fluid 11, and of thetank 10 serving a dual role as the casing body, noise is able to be reduced. - Further, according to the present embodiment, since the
intake port 20 a of thepump 20 is disposed at a higher height position than themotor stator 23, a state can be maintained in which thewindings 23 b of themotor stator 23 are immersed in the handled-fluid 11 and are directly cooling while thepump 20 is running normally. - Further, according to the present embodiment, since the control device 4 monitors the current supplied to the
motor stator 23, and in cases in which the current supplied to themotor stator 23 falls below a prescribed threshold, the control device 4 performs at least one operation out of stopping the supply of current to themotor stator 23 or issuing an alert, in cases in which thewindings 23 b are not immersed in the handled-fluid 11 and thewindings 23 b cannot be efficiently cooled by the handled-fluid 11, an excessive increase in the temperature of thewindings 23 b when thepump 20 is continually run can be prevented. - Detailed description has been given regarding the first embodiment. However, the present technology is not limited to the above embodiment, and various modifications to the above embodiment are possible. In the following, a modified example will be described with reference to the drawings. In the following description, and in the drawings employed by the following description, reference numerals identical to the reference numerals employed for corresponding portions in the above embodiment will be employed for portions that are able to be configured similarly to in the above embodiment, and duplicate explanation thereof will be omitted.
-
FIG. 4 is a schematic diagram illustrating the configuration of apump apparatus 1′ according to a second embodiment. - In the second embodiment, a
guide 29 is disposed on the intake side of thepump 20. Theguide 29 guides the handled-fluid 11 such that the handled-fluid 11 passes through a position where themotor casing 25 is open. In the example illustrated, theguide 29 has a flat plate shape, is spaced above theintake port 20 a, and is disposed so as to face both theintake port 20 a and theopening 25 a of themotor casing 25. - When the
pump 20 starts running, handled-fluid 11 in thetank 10 is sucked from a gap between themotor casing 25 and theguide 29, passes through the position where themotor casing 25 is open, and into theintake port 20 a. - According to this aspect, in the vicinity of the
windings 23 b of themotor stator 23, even if the temperature of the handled-fluid 11 increases due to heat generated by thewindings 23 b, since the handled-fluid 11 with the increased temperature does not stay in this location, the efficiency by which thewindings 23 b are cooled by the handled-fluid 11 can be raised even further. - Note that although the
pump 20 is mounted in a vertical orientation (with theintake port 20 a pointing upward) in thetank 10 in the above embodiments, there is no limitation thereto, and depending on the shape of thetank 10 and the like, thepump 20 may be set in a horizontal orientation (with theintake port 20 a pointing sideways) in thetank 10. - Further, although in the above embodiments configuration is such that the control device 4 calculates a rate of change in the current supplied to the
motor stator 23, and in cases in which the current falls below a prescribed threshold and thepump 20 is judged to be in a state running empty, the control device 4 performs at least one operation out of stopping the supply of current to themotor stator 23 or issuing an alert, there is no limitation thereto. - For example, configuration may be such that the control device 4 monitors a measurement value from a non-illustrated flow rate sensor provided to the
feed pipe 14 or the like, and in cases in which the flow rate falls below a prescribed threshold and thepump 20 is judged to be in a state running empty, the control device 4, the control device 4 performs at least one operation out of stopping the supply of current to themotor stator 23 or issuing an alert. - Further, for example, configuration may be such that the control device 4 monitors a measurement value from a non-illustrated water level sensor provided in the
tank 10, and in cases in which the water level in thetank 10 falls below a prescribed threshold (for example, the height position of theintake port 20 a) and thepump 20 is judged to be in a state running empty, the control device 4, the control device 4 performs at least one operation out of stopping the supply of current to themotor stator 23 or issuing an alert. - According to this aspect, in cases in which the
windings 23 b are not immersed in the handled-fluid 11 and thewindings 23 b cannot be efficiently cooled by the handled-fluid 11, an excessive increase in the temperature of thewindings 23 b when thepump 20 is continually run can be prevented. - Although embodiments of the present technology have been described by way of example, the scope of the present technology is not limited to these embodiments, and it goes without saying that various changes and modifications may be implemented as appropriate according to usage within the scope set forth in the claims.
Claims (4)
1. A pump apparatus comprising:
a tank in which a handled-fluid having insulating properties is stored; and
a pump that is mounted in the tank, wherein
the pump has
an impeller in which a magnet is embedded,
a motor stator that is disposed at a position opposing the magnet,
a pump casing that houses the impeller, and
a motor casing that houses the motor stator, and
the motor casing is open such that a winding of the motor stator is immersed in the handled-fluid.
2. The pump apparatus according to claim 1 , wherein
a guide is disposed on an intake side of the pump, the guide guiding the handled-fluid such that the handled-fluid passes through a position where the motor casing is open.
3. The pump apparatus according to claim 1 , wherein
an intake port of the pump is disposed at a higher height position than the motor stator.
4. The pump apparatus according to claim 3 , further comprising:
a controller that monitors current supplied to the motor stator, and in cases in which the current supplied to the motor stator falls below a prescribed threshold, the controller performs at least one operation out of stopping the supply of current to the motor stator or issuing an alert.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017254071A JP2019120158A (en) | 2017-12-28 | 2017-12-28 | Pump device |
JP2017-254071 | 2017-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20190203724A1 true US20190203724A1 (en) | 2019-07-04 |
Family
ID=67059400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/225,887 Abandoned US20190203724A1 (en) | 2017-12-28 | 2018-12-19 | Pump apparatus |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190203724A1 (en) |
JP (1) | JP2019120158A (en) |
KR (1) | KR20190080770A (en) |
CN (1) | CN109973397A (en) |
TW (1) | TW201930723A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210348614A1 (en) * | 2020-05-06 | 2021-11-11 | Franklin Electric Co. | Water gulping detection |
US12025137B2 (en) * | 2021-05-05 | 2024-07-02 | Franklin Electric Co., Inc. | Water gulping detection |
Citations (4)
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US20090081050A1 (en) * | 2007-08-15 | 2009-03-26 | Mono Pumps Limited | Pump system |
US20130240058A1 (en) * | 2012-03-13 | 2013-09-19 | Joseph Wilson | Basement Sewer Drain Recovery and Discharge Device |
US20170175746A1 (en) * | 2015-12-17 | 2017-06-22 | Wayne/Scott Fetzer Company | Integrated sump pump controller with status notifications |
US20180216624A1 (en) * | 2017-01-27 | 2018-08-02 | Regal Beloit America, Inc. | Centrifugal pump assemblies having an axial flux electric motor and methods of assembly thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS56131200A (en) * | 1980-03-15 | 1981-10-14 | Tominaga Oil Pump | Submerged installing type pump |
JP3359704B2 (en) * | 1993-07-26 | 2002-12-24 | 三菱電機株式会社 | Hydraulic pressure source device |
JP4789333B2 (en) * | 2001-02-28 | 2011-10-12 | 株式会社桜川ポンプ製作所 | underwater pump |
JP6625447B2 (en) * | 2015-03-11 | 2019-12-25 | 株式会社荏原製作所 | Motor pump |
-
2017
- 2017-12-28 JP JP2017254071A patent/JP2019120158A/en active Pending
-
2018
- 2018-12-19 US US16/225,887 patent/US20190203724A1/en not_active Abandoned
- 2018-12-24 KR KR1020180168183A patent/KR20190080770A/en unknown
- 2018-12-24 TW TW107146702A patent/TW201930723A/en unknown
- 2018-12-26 CN CN201811603767.8A patent/CN109973397A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090081050A1 (en) * | 2007-08-15 | 2009-03-26 | Mono Pumps Limited | Pump system |
US20130240058A1 (en) * | 2012-03-13 | 2013-09-19 | Joseph Wilson | Basement Sewer Drain Recovery and Discharge Device |
US20170175746A1 (en) * | 2015-12-17 | 2017-06-22 | Wayne/Scott Fetzer Company | Integrated sump pump controller with status notifications |
US20180216624A1 (en) * | 2017-01-27 | 2018-08-02 | Regal Beloit America, Inc. | Centrifugal pump assemblies having an axial flux electric motor and methods of assembly thereof |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210348614A1 (en) * | 2020-05-06 | 2021-11-11 | Franklin Electric Co. | Water gulping detection |
US12025137B2 (en) * | 2021-05-05 | 2024-07-02 | Franklin Electric Co., Inc. | Water gulping detection |
Also Published As
Publication number | Publication date |
---|---|
CN109973397A (en) | 2019-07-05 |
TW201930723A (en) | 2019-08-01 |
JP2019120158A (en) | 2019-07-22 |
KR20190080770A (en) | 2019-07-08 |
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