JP2018078726A - Electric motor and pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which can continue an operation even when a flood such as heavy rainfall occurs.SOLUTION: A totally-enclosed type electric motor 9 has a motor casing 21, a driving shaft 24 to which a rotor 30 is fixed, and a fan structure 25 arranged outside of the motor casing 21 and attached to the driving shaft 24. The fan structure 25 has a housing 45 rotatably supported by bearings 48 and 49, a blade 44 fixed to the housing 45, a magnet coupling 47 arranged between the housing 45 and the driving shaft 24 and magnetically connecting the driving shaft 24 and the housing 45, and a shaft seal 46 sealing a clearance between the housing 45 and the driving shaft 24. The magnet coupling 47 and the bearings 48 and 49 are arranged within a sealed space 56 formed by the housing 45 and the shaft seal 46.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric motor and a pump device including the electric motor.

  As a land motor used in lifelines such as pumps, a so-called fully-enclosed external fan type motor that forcibly cools the motor casing by sucking air with blades directly connected to the drive shaft of the motor to cool the motor itself Is often used outdoors.

  Such a motor has a sealed structure so that water such as rainwater does not enter the motor, but there is a problem that the pump cannot be operated if the motor itself is submerged. In recent years, equipment such as a pump device equipped with a motor has been submerged due to water damage such as heavy rain, and it has become important to take measures against the motor that leads to this failure.

  FIG. 7 is a cross-sectional view showing a fully closed outer fan type motor. The motor body 100 has a sealed structure, and the interior of the motor body 100 is isolated from the external environment. More specifically, seal members 112 and 113 are disposed between the motor casing 111 and a drive shaft (main shaft) 101 penetrating the motor casing 111, and O between the constituent members of the motor casing 111. A ring 109 is attached. These seal members 112 and 113 and the O-ring 109 prevent water from entering the motor main body 100.

  A rotor 103 fixed to the drive shaft 101 and a stator 104 surrounding the rotor 103 are disposed inside the motor casing 111. The stator 104 is mounted on the inner surface of the motor casing 111. Bearings 114 and 115 are arranged between the drive shaft 101 and the motor casing 111, and these bearings 114 and 115 support the drive shaft 101 in a freely rotatable manner. The rotor 103 is rotated by a rotating magnetic field formed between the rotor 103 and the stator 104, and the drive shaft 101 rotates together with the rotor 103.

  A blade 102 for sending cooling air to the motor casing 111 is fixed to the drive shaft 101. The blades 102 are disposed outside the motor body 100. A fan cover 110 is attached to the motor casing 111 so as to surround the blades 102. A plurality of slit holes 110 a are formed in the fan cover 110.

  A plurality of fins 106 for effectively cooling the motor main body 100 are attached to the surface of the motor casing 111, and the plurality of fins 106 are formed integrally with the motor casing 111. When the blades 102 rotate together with the drive shaft 101, air is sent to the motor casing 111 through the plurality of slit holes 110a (see arrows in FIG. 7). This air comes into contact with the plurality of fins 106 and the motor casing 111 to remove heat from the motor.

Japanese Patent Laid-Open No. 10-98851 JP2013-211949A

  The above-described fully-enclosed fan motor has a sealed structure in which water does not enter the interior of the motor body 100 even if it is submerged, but such a motor may cause the following problems. It is in the outer fan structure of the motor. That is, since the blade 102 is fixed to the drive shaft 101 outside the motor body 100, the blade 102 stirs water when the motor itself is submerged. Since the mass of water is nearly 1000 times the mass of air, if the blade 102 rotates while the motor is submerged, the motor output will be over output exceeding the rated torque. As a result, the motor overcurrent protection device will Or the blades 102 themselves cannot withstand excessive torque and are damaged.

  When the motor overcurrent protection device is activated and the motor is stopped, the pump to which the motor is connected is also stopped, so that the pump cannot discharge water. When the blades 102 are damaged, the submergence of the motor is eliminated, and the cooling action due to the rotation of the blades 102 is lost even when the pump is in normal operation, so the motor is not cooled and the motor burns out. In this way, when the motor stops, the pump also stops, so the pump cannot discharge water. These situations have a great impact on the lifeline.

  The problems described above can occur even if the motor itself is not completely submerged. In other words, in a state where the blade 102 is submerged, the blade 102 stirs water, so that the motor overcurrent protection device operates or the blade 102 is damaged.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an electric motor capable of continuing operation even when water damage such as heavy rain occurs and a pump device including the electric motor. And

  In order to achieve the above-described object, one aspect of the present invention is a fully-closed electric motor, in which a motor casing, a rotor and a stator disposed inside the motor casing, and the rotor are fixed. And a fan structure disposed outside the motor casing and attached to the drive shaft, the fan structure including a bearing attached to an end of the drive shaft, and the bearing A rotatably supported housing, a blade fixed to the housing, a magnet coupling that is disposed between the housing and the drive shaft and magnetically connects the drive shaft and the housing; A shaft seal that seals a gap between the housing and the drive shaft, and the magnet coupling and the bearing are connected to the housing and the shaft seal. Characterized in that it is located has been sealed space formed me.

In a preferred aspect of the present invention, one end of the housing is open, the other end of the housing is completely closed, and the shaft seal is between the one end of the housing and the drive shaft. The gap is sealed.
In a preferred aspect of the present invention, the magnet coupling includes an outer ring magnet fixed to the housing and an inner ring magnet fixed to the drive shaft, and the outer ring magnet and the inner ring magnet are It is arranged concentrically with the drive shaft.
In a preferred aspect of the present invention, the shaft seal is a self-tightening seal including an annular cover ring that contacts an outer peripheral surface of the drive shaft and a spring ring accommodated in the cover ring. To do.

  Another aspect of the present invention includes a pump that transfers liquid and a fully-closed electric motor that drives the pump. The electric motor includes a motor casing, a rotor disposed inside the motor casing, and a stationary motor. A rotor, a drive shaft to which the rotor is fixed, and a fan structure that is disposed outside the motor casing and is attached to the drive shaft. The fan structure is provided at an end of the drive shaft. A bearing mounted thereon, a housing rotatably supported by the bearing, a blade fixed to the housing, and the housing and the drive shaft, wherein the drive shaft and the housing are magnetically And a shaft seal that seals a gap between the housing and the drive shaft, and the magnet coupling and the bearing include a front It is a pump device, characterized in that disposed in the sealed space formed by said shaft seal housing.

In a preferred aspect of the present invention, one end of the housing is open, the other end of the housing is completely closed, and the shaft seal is between the one end of the housing and the drive shaft. The gap is sealed.
In a preferred aspect of the present invention, the magnet coupling includes an outer ring magnet fixed to the housing and an inner ring magnet fixed to the drive shaft, and the outer ring magnet and the inner ring magnet are It is arranged concentrically with the drive shaft.
In a preferred aspect of the present invention, the shaft seal is a self-tightening seal including an annular cover ring that contacts an outer peripheral surface of the drive shaft and a spring ring accommodated in the cover ring. To do.

  The magnet coupling can prevent an excessive torque from acting on the blades, and can prevent the output of the motor from becoming an excessive output exceeding the rated torque. Therefore, even when water damage such as heavy rain occurs, the blades are not damaged, and the overcurrent protection device for the motor does not operate. As a result, the electric motor (and the pump device) can continue to operate even when water damage such as heavy rain occurs.

It is a figure which shows one Embodiment of the pump apparatus provided with the electric motor. It is sectional drawing which shows one Embodiment of an electric motor. It is sectional drawing which shows one Embodiment of a fan structure. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a figure which shows other embodiment of a pump apparatus. It is a figure which shows other embodiment of a pump apparatus. It is sectional drawing which shows a fully closed external fan type motor.

Embodiments of the present invention will be described below with reference to the drawings. Note that, in the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a view showing an embodiment of a pump device provided with an electric motor. The pump apparatus 1 shown in FIG. 1 is installed in the pump station 5 provided with the treated water tank 2, the pump chamber 3, and the ground part 4, for example. The pump device 1 includes a pump 6, a suction pipe 7 connected to the suction port of the pump 6, a discharge pipe 8 connected to the discharge port of the pump 6, and an electric motor (motor) 9 that drives the pump 6. ing. The pump device 1 according to the present embodiment is generally called an outside tank drainage pump device.

  The suction pipe 7 passes through a wall that partitions the treated water tank 2 and the pump chamber 3, and a suction port (water inlet) of the suction pipe 7 is submerged in the water in the treated water tank 2. The discharge pipe 8 extends to the outside of the pump station 5, and the water in the treated water tank 2 is transferred to the outside through the suction pipe 7, the pump 6, and the discharge pipe 8.

  The ground part 4 is arranged at a position higher than the treated water tank 2 and the pump chamber 3. The pump 6 is arranged in the pump chamber 3, and the electric motor 9 is arranged in the ground part 4. The pump 6 is connected to an electric motor 9 via a connecting shaft 10. The electric motor 9 is arranged vertically. The connecting shaft 10 extends in the height direction (that is, the vertical direction) of the pump station 5, and connects the impeller 6 a of the pump 6 and the electric motor 9. The impeller 6a of the pump 6 is disposed in the pump casing 6b. When the electric motor 9 is driven, the driving force is transmitted to the connecting shaft 10, and the impeller 6 a fixed to the connecting shaft 10 rotates together with the connecting shaft 10. Due to the rotation of the impeller 6a, the water in the treated water tank 2 is sucked into the pump 6 through the suction pipe 7, and as a result, the water is transferred to the outside through the discharge pipe 8.

  FIG. 2 is a cross-sectional view showing an embodiment of the electric motor 9. The electric motor 9 is a fully enclosed external fan type electric motor. The fully-closed motor is a motor of a type in which the entire motor has a sealed structure and does not allow liquid to enter the interior. The fully-enclosed fan motor is a fully-enclosed motor that is provided with cooling blades outside the motor casing.

  The fully closed outer fan type motor 9 includes a fully closed motor body 20, a drive shaft (main shaft) 24 connected to the connecting shaft 10 (see FIG. 1), and a cooling fan structure 25 attached to the drive shaft 24. And. The drive shaft 24 extends in the height direction (that is, the vertical direction) of the pump station 5, and is connected to the impeller 6 a of the pump 6 through the connection shaft 10. In FIG. 2, the connecting shaft 10 is not shown.

  The electric motor main body 20 has a structure in which the whole is sealed with a motor casing 21, and the interior of the motor casing 21 is isolated from the external environment. The motor casing 21 has a cylindrical motor frame 21 a and a bracket 21 b that closes the opening end of the motor frame 21 a. The bracket 21 b is fixed to the motor frame 21 a by fastening fasteners (for example, screws) 29. Has been. In FIG. 2, only one fastener 29 is shown, but the bracket 21 b is fixed to the motor frame 21 a by a plurality of fasteners 29.

  A rotor (rotor) 30 fixed to the drive shaft 24 and a stator (stator) 31 that surrounds the rotor 30 and forms a rotating magnetic field are arranged inside the motor casing 21. Hereinafter, in this specification, the rotor 30 and the stator 31 may be collectively referred to as a rotating element.

  The stator 31 is fixed to the inner surface of the motor frame 21a. The rotor 30 has a rotor core 30a and a secondary conductor 30b that is electrically connected to the rotor core 30a. The stator 31 has a stator core 31a and a stator coil (winding) 31b wound around the stator core 31a. The rotor 30 is rotated by a rotating magnetic field formed between the rotor 30 and the stator 31, and the drive shaft 24 to which the rotor 30 is fixed rotates together with the rotor 30.

  The drive shaft 24 passes through the motor casing 21 (that is, the motor frame 21a and the bracket 21b). A shaft seal device 35 is disposed between the drive shaft 24 and the motor frame 21a, and a shaft seal device 36 is disposed between the drive shaft 24 and the bracket 21b. Further, an annular seal member (for example, an O-ring) 37 is disposed between the motor frame 21a and the bracket 21b. The shaft sealing devices 35 and 36 and the seal member 37 prevent water from entering the motor casing 21. In this embodiment, the shaft seal devices 35 and 36 are annular self-tightening seals, and are generally called oil seals or mechanical seals.

  A bearing 40 is disposed between the drive shaft 24 and the motor frame 21a, and a bearing 41 is disposed between the drive shaft 24 and the bracket 21b. These bearings 40 and 41 support the drive shaft 24 rotatably. In this embodiment, the bearings 40 and 41 are rolling bearings. The bearing 40 is disposed on the rotating element side with respect to the shaft seal device 35, and the bearing 41 is also disposed on the rotating element side with respect to the shaft seal device 36. That is, the bearings 40 and 41 are disposed in a sealed space 60 formed by the shaft seal devices 35 and 36 and the motor casing 21. The rotating elements (that is, the rotor 30 and the stator 31) are also disposed in the sealed space 60.

  As described above, the electric motor 9 includes the fan structure 25 for sending cooling air to the surface of the motor casing 21. The fan structure 25 is attached to the drive shaft 24 at a position outside the motor casing 21. More specifically, the fan structure 25 is attached to the end of the drive shaft 24 opposite to the end connected to the connecting shaft 10. The fan structure 25 is attached to the outside of the electric motor body 20 so as to be called an outer fan type. The fan structure 25 blows off air on the surface of the electric motor body 20 in order to release heat generated in the electric motor body 20.

  A fan cover 26 is attached to the motor casing 21 (more specifically, the motor frame 21a) so as to surround the fan structure 25. The fan cover 26 is configured to guide cooling air to the motor body 20 side. The fan cover 26 formed in a bowl shape is disposed so as to cover a part of the motor casing 21 and the entire fan structure 25.

  A plurality of slit holes (openings) 26 a are formed in the fan cover 26. The plurality of slit holes 26 a are formed on the surface of the fan cover 26 that faces the fan structure 25.

  A plurality of fins 27 for cooling the electric motor main body 20 are attached to the surface of the motor casing 21 (more specifically, the motor frame 21a). The plurality of fins 27 are formed integrally with the motor frame 21a. When the blades 44 (described later in detail) of the fan structure 25 rotate together with the drive shaft 24, air is sent to the motor casing 21 through the plurality of slit holes 26a (see arrows in FIG. 2). This air contacts the motor casing 21 and the plurality of fins 27 and takes the heat of the electric motor body 20. In the present embodiment, the size (ie, diameter) of the fan structure 25 is smaller than the size (ie, diameter) of the electric motor body 20.

  FIG. 3 is a cross-sectional view showing an embodiment of the fan structure 25. The fan structure 25 includes bearings 48 and 49 attached to the end of the drive shaft 24, a housing (boss part) 45 rotatably supported by the bearings 48 and 49, and a blade 44 fixed to the housing 45. The magnet coupling 47 is disposed between the housing 45 and the drive shaft 24 and magnetically connects the drive shaft 24 and the housing 45, and the shaft seal seals the gap between the housing 45 and the drive shaft 24. 46.

  In the present embodiment, the bearings 48 and 49 are rolling bearings and are disposed adjacent to both ends of the magnet coupling 47. However, the arrangement location of the bearings 48 and 49 is not limited to this embodiment. In one embodiment, the bearings 48 and 49 may be spaced apart from the magnet coupling 47. Furthermore, in this embodiment, the two bearings 48 and 49 are provided, but the number of bearings is not limited to this embodiment. One bearing may be provided, or more than two bearings may be provided.

  The blades 44 and the housing 45 are integrally formed. The blades 44 extend from the outer surface of the housing 45 outward in the radial direction of the housing 45, and the drive shaft 24 is disposed adjacent to the inner surface of the housing 45. The housing 45 is disposed concentrically with the drive shaft 24. The end of the drive shaft 24 has a detent shape.

  One end 45a of the housing 45 is open, and the other end 45b of the housing 45 is completely closed. The shaft seal 46 seals the gap between the one end 45 a of the housing 45 and the drive shaft 24. In the present embodiment, the housing 45 is formed in a bowl shape and completely covers the end of the drive shaft 24.

  An annular recess 50 is formed at one end 45 a of the housing 45, and the shaft seal 46 is attached to the recess 50. The shaft seal 46 is a self-tightening seal having an annular shape. More specifically, the shaft seal 46 is a self-tightening seal including an annular cover ring 46a that contacts the outer peripheral surface of the drive shaft 24 and a spring ring 46b that is accommodated in the cover ring 46a. The shaft seal 46 is generally called an oil seal or a mechanical seal.

  The cover ring 46a has a U-shaped cross section, and the shaft seal 46 is disposed so that the opening of the cover ring 46a can come into contact with water. The outer surface of the cover ring 46a is in contact with the recess 50 of the housing 45 and the outer peripheral surface of the drive shaft 24, and a part of the outer surface of the cover ring 46a is in close contact with the drive shaft 24 by a spring ring 46b. In other words, the spring ring 46 b is configured to urge a part of the outer surface of the cover ring 46 a toward the drive shaft 24. In this way, the shaft seal 46 prevents water from entering between the housing 45 and the drive shaft 24.

  An annular sleeve 24 a is attached to the end of the drive shaft 24. The sleeve 24 a is disposed concentrically with the drive shaft 24. Inner rings of the bearings 48 and 49 are fixed to the sleeve 24 a, and outer rings of the bearings 48 and 49 are fixed to the housing 45. The housing 45 is not directly fixed to the drive shaft 24 but is connected to the drive shaft 24 via bearings 48 and 49 and a magnet coupling 47. The bearings 48 and 49 determine a relative position between the drive shaft 24 and the housing 45.

  The magnet coupling 47 is a member for transmitting the rotation of the drive shaft 24 to the housing 45 and the blades 44. That is, when the magnet coupling 47 is not provided, the rotation of the drive shaft 24 is not accompanied by the rotation of the blades 44. Therefore, in order to transmit the rotation of the drive shaft 24 to the blades 44, the magnet coupling 47 is disposed between the housing 45 and the drive shaft 24 (more specifically, the sleeve 24a).

  4 is a cross-sectional view taken along line AA in FIG. In FIG. 4, the blades 44 are not shown. As shown in FIG. 4, the magnet coupling 47 has an inner ring magnet 47 a fixed to the drive shaft 24 (more specifically, a sleeve 24 a), and an outer ring magnet 47 b fixed to the housing 45. ing. These magnets 47 a and 47 b are composed of annular permanent magnets and are arranged concentrically with the drive shaft 24. These magnets 47a and 47b have a cylindrical shape and are arranged with a constant air gap.

  The inner ring magnet 47a has the same number of magnetic poles magnetized on the circumference toward the outer circumferential surface, and the outer ring magnet 47b is arranged on the circumference toward the inner circumferential surface. It has magnetic poles with the same number of poles. The magnets 47a and 47b are alternately magnetized with N and S poles, respectively. These magnets 47a and 47b are arranged so that different magnetic poles face each other, and a magnetic attractive force acts between these magnets 47a and 47b. Therefore, when the drive shaft 24 to which the inner ring magnet 47a is fixed rotates, the rotation of the drive shaft 24 causes the housing 45 (and the outer ring magnet 47b to be fixed via the magnetic force acting between the magnets 47a and 47b. Transmitted to the blades 44). In this way, the housing 45 and the blades 44 rotate together with the drive shaft 24. As a result, the blades 44 can rotate with the drive shaft 24 without contacting the drive shaft 24.

  As shown in FIG. 3, the magnet coupling 47 and the bearings 48 and 49 are disposed in a sealed space 56 formed by the housing 45 and the shaft seal 46. The magnet coupling 47 and the bearings 48 and 49 are disposed closer to the other end 45b of the housing 45 than the one end 45a of the housing 45 where the shaft seal 46 is disposed. In other words, the magnet coupling 47 and the bearings 48 and 49 are disposed upstream of the shaft seal 46 in the air flow direction when the blades 44 rotate. With this arrangement, the shaft seal 46 prevents water from entering the sealed space 56, and as a result, the magnet coupling 47 and the bearings 48 and 49 do not come into contact with water.

  As shown in FIG. 3, a holding plate 52 that restricts the movement of the bearing 48 is fixed to the end of the drive shaft 24 by fastening screws 53. The magnet coupling 47 and the bearings 48 and 49 are disposed between the pressing plate 52 and the shaft seal 46, and the pressing plate 52 and the screw 53 are also disposed in the sealed space 56.

  The diameter of the holding plate 52 is larger than the diameter of the drive shaft 24 and smaller than the outer diameter of the bearing 48. Further, an annular ledge 54 is formed in the housing 45, and the diameter of the ledge 54 is smaller than the outer diameter of the bearing 48. The holding plate 52 and the protrusion 54 are in contact with the end of the bearing 48. In this way, the holding plate 52 and the ledge 54 can limit the movement of the bearing 48.

  When the electric motor 9 is driven, the drive shaft 24 rotates, and the rotation of the drive shaft 24 is transmitted to the housing 45 and the blades 44 via the magnet coupling 47. When the fan structure 25 is in a gas atmosphere, that is, when the fan structure 25 is not submerged, the housing 45 and the blades 44 rotate in synchronization with the rotation of the drive shaft 24. The blade 44 sucks ambient air from the slit hole 26 a of the fan cover 26, and the air sucked from the slit hole 26 a flows on the outer peripheral surface of the electric motor body 20 to cool the electric motor body 20.

  The housing 45 is magnetically coupled to the drive shaft 24. Therefore, when the water level in the treated water tank 2 rises due to flood damage such as heavy rain and the water level reaches the ground part 4 (see FIG. 1) of the pump station 5, the fan structure 25 is submerged (or submerged). To do. In this case, since the torque acting on the blades 44 increases, the rotation of the blades 44 is not synchronized with the rotation of the drive shaft 24. That is, the magnet coupling 47 is stepped out. As a result, even if the drive shaft 24 rotates, the blades 44 do not rotate but remain stopped.

  According to the present embodiment, when excessive torque acts on the blade 44, the blade 44 is out of synchronization with the drive shaft 24. That is, since the magnet coupling 47 can prevent an excessive torque from acting on the blade 44, the blade 44 can be prevented from being damaged. Furthermore, according to the present embodiment, since the blades 44 are out of synchronization with the drive shaft 24, the magnet coupling 47 can prevent the output of the electric motor 9 from being over-output exceeding the rated torque. Therefore, the magnet coupling 47 can prevent the operation of the overcurrent protection device of the electric motor 9. As a result, the electric motor 9 (and the pump device 1) can continue to operate even when water damage such as heavy rain occurs.

  Furthermore, according to the present embodiment, the magnet coupling 47 and the bearings 48 and 49 are disposed in the sealed space 56. That is, the housing 45 and the shaft seal 46 can prevent water from contacting the magnet coupling 47 and the bearings 48 and 49. Therefore, even if the electric motor 9 itself is submerged, the magnet coupling 47 and the bearings 48 and 49 can perform their original functions without coming into contact with water.

  Even when the rotation of the blades 44 is stopped when the electric motor 9 is submerged, the electric motor 9 is cooled by contact with water, so that the electric motor 9 is burned even if the operation of the pump device 1 is continued. There is nothing. Further, when the electric motor 9 recovers from the submergence due to the drainage in the pump station 5 and the fan structure 25 exists in the gas atmosphere again, the blades 44 are again synchronized with the drive shaft 24 by the magnet coupling 47. Rotate.

  FIG. 5 is a view showing another embodiment of the pump device 1. Since the configuration and operation of the present embodiment that are not particularly described are the same as those of the above-described embodiment, redundant description thereof is omitted. As shown in FIG. 5, the pump 6 is directly connected to the electric motor 9 without using the connecting shaft 10. That is, the drive shaft 24 of the electric motor 9 is directly connected to the impeller 6 a of the pump 6. According to this embodiment, since the pump 6 and the electric motor 9 are disposed in the pump chamber 3, the entire pump device 1 can be made compact. Furthermore, according to this embodiment, since it is not necessary to provide the connecting shaft 10, the overall cost of the pump device 1 can be reduced, and maintenance of the pump device 1 can be performed easily.

  FIG. 6 is a view showing still another embodiment of the pump device 1. Since the configuration and operation of the present embodiment that are not particularly described are the same as those of the above-described embodiment, redundant description thereof is omitted. As shown in FIG. 6, the drive shaft 24 extends in the width direction (that is, the horizontal direction) of the pump station 5 and is connected to the pump 6. Thus, the electric motor 9 may be arrange | positioned sideways.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Treated water tank 3 Pump chamber 4 Above-ground part 5 Pump station 6 Pump 7 Suction pipe 8 Discharge pipe 9 Electric motor 10 Connecting shaft 20 Motor main body 21 Motor casing 21a Motor frame 21b Bracket 24 Drive shaft 25 Fan structure 26 Fan cover 27 Fin 30 Rotor 31 Stator 35, 36 Shaft seal device 37 Seal member 40, 41 Bearing 44 Blade 45 Housing 46 Shaft seal 46a Cover ring 46b Spring ring 47 Magnet coupling 47a Inner ring magnet 47b Outer ring magnet 48, 49 Bearing 56 , 60 sealed space

Claims (8)

A fully-closed electric motor,
A motor casing;
A rotor and a stator disposed inside the motor casing;
A drive shaft to which the rotor is fixed;
A fan structure disposed outside the motor casing and attached to the drive shaft,
The fan structure is
A bearing attached to an end of the drive shaft;
A housing rotatably supported by the bearing;
A vane fixed to the housing;
A magnet coupling that is disposed between the housing and the drive shaft and magnetically connects the drive shaft and the housing;
A shaft seal that seals a gap between the housing and the drive shaft;
The electric motor according to claim 1, wherein the magnet coupling and the bearing are arranged in a sealed space formed by the housing and the shaft seal. One end of the housing is open,
The other end of the housing is completely closed,
The electric motor according to claim 1, wherein the shaft seal seals a gap between the one end portion of the housing and the drive shaft. The magnet coupling is
An outer ring magnet fixed to the housing;
An inner ring magnet fixed to the drive shaft,
The electric motor according to claim 1, wherein the outer ring magnet and the inner ring magnet are arranged concentrically with the drive shaft.   The said shaft seal is a self-tightening seal | sticker containing the cyclic | annular cover ring which contacts the outer peripheral surface of the said drive shaft, and the spring ring accommodated in the said cover ring. Electric motor. A pump for transferring liquid;
A fully-closed electric motor that drives the pump,
The motor is
A motor casing;
A rotor and a stator disposed inside the motor casing;
A drive shaft to which the rotor is fixed;
A fan structure disposed outside the motor casing and attached to the drive shaft,
The fan structure is
A bearing attached to an end of the drive shaft;
A housing rotatably supported by the bearing;
A vane fixed to the housing;
A magnet coupling that is disposed between the housing and the drive shaft and magnetically connects the drive shaft and the housing;
A shaft seal that seals a gap between the housing and the drive shaft;
The pump device according to claim 1, wherein the magnet coupling and the bearing are disposed in a sealed space formed by the housing and the shaft seal. One end of the housing is open,
The other end of the housing is completely closed,
The pump device according to claim 5, wherein the shaft seal seals a gap between the one end portion of the housing and the drive shaft. The magnet coupling is
An outer ring magnet fixed to the housing;
An inner ring magnet fixed to the drive shaft,
The pump device according to claim 5, wherein the outer ring magnet and the inner ring magnet are arranged concentrically with the drive shaft.   The said shaft seal is a self-tightening seal | sticker containing the cyclic | annular cover ring which contacts the outer peripheral surface of the said drive shaft, and the spring ring accommodated in the said cover ring. Pump device.

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