JP2010031837A - Motor and pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent water intrusion into a bearing supporting a shaft, in a pump device having a horizontal shaft of a motor. <P>SOLUTION: A motor housing 5 and a pump housing 6 are formed with a shaft support bulkhead 10 put therebetween, the shaft support bulkhead retains an oil seal 20 at a pump housing side, and a tube part 18 is provided at the motor housing side. A bearing 26 supporting the shaft 40 is retained in a through-hole 19 of the tube part, a seal space S is formed between an opening end surface of the through-hole and the oil seal, and an impeller 60 is attached to the shaft extending into the pump housing from the oil seal. A stopper plate 45 is provided on the shaft between the bearing and the oil seal, and the seal space is communicated to an outside by a water drain path D. Consequently, water leaking in from the oil seal and flowing on the shaft is shut off by the stopper plate and does not reach the bearing 26, and is discharged to the outside without staying in the seal space S. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor and a pump device, and more particularly to a waterproof structure for a bearing of a shaft of the motor.

2. Description of the Related Art Conventionally, for example, there is a motor-driven pump device in which a motor shaft is supported on a case, an impeller is attached to the tip of the shaft, and the motor and the pump are assembled together.
As such a pump device, in the device described in Japanese Patent Application Laid-Open No. 2001-090685, a drive motor is attached to a recess in the upper part of the casing with its shaft (rotating shaft) in the vertical direction, and the shaft penetrates the bottom wall of the recess. An impeller is attached to the lower end of the. An oil seal as a seal member is provided between the shaft portion of the impeller fitted to the shaft and the bottom wall so that the water in the chamber where the impeller faces does not enter the recess housing the drive motor. .

  However, since the oil seal uses an elastic body at the contact part with the shaft, the elastic body is scratched, and due to deterioration with time, insufficient follow-up to vibration of the shaft, biting of foreign matter such as lint, etc. There is a possibility that water may leak from the oil seal portion into the recess due to a gap between them or due to a pressure difference between the inside and outside of the oil seal due to a temperature change.

Therefore, as a countermeasure, the bottom wall of the recess is formed into an inclined surface that becomes lower as it goes outward from the casing, and a discharge hole that continues to the inclined surface is provided in the outer wall of the recess.
As a result, water that has leaked into the recess through the oil seal portion flows through the inclined surface and is discharged from the discharge hole to the outside of the recess, while the drive motor is disposed at a position higher than the oil seal. Water never reaches inside.

Japanese Patent Laid-Open No. 2001-090685

By the way, this type of pump device is used as a circulation pump of, for example, a washing machine or a dishwasher. However, depending on the specifications, a so-called horizontal arrangement in which the motor shaft is in a horizontal direction may be required.
In the above-mentioned conventional pump device in which the motor is arranged at the top in the vertical type with the shaft up and down, the water leaking from the oil seal part into the recess is prevented from rising by its own weight and all flows through the inclined surface of the bottom wall. However, when the pump device is placed horizontally as it is, water may enter the bearing through the shaft even if there is an inclined surface or a discharge hole.
If water leaking into the recess reaches the bearing that supports the shaft, the bearing will rust and the shaft will not rotate, or if it reaches the coil wiring or wiring connector of the motor, there is a risk of an electrical short circuit. It will impair durability and reliability.

  Accordingly, an object of the present invention is to provide a motor in which water penetration into the motor is reliably prevented in the horizontal arrangement of the shaft in view of the above problems.

  The present invention relates to a motor in which a bearing is provided in a motor housing that houses a stator and a rotor, the shaft of the rotor is horizontally supported by the bearing, and the shaft extends from the bearing through a seal member to the outside of the motor housing. The shaft surface flow blocking means for blocking the axial flow of the liquid on the shaft is provided between the bearing and the seal member.

  As the shaft surface flow blocking means, a disc-shaped stopper plate fitted into the shaft, an O-ring locked to the shaft, or a flange formed integrally with the shaft can be employed.

  The motor housing includes a partition member having a seal member holding portion that holds the seal member and a through hole that holds the bearing apart from the seal member holding portion, and the partition member seals with the opening end surface of the through hole. It is desirable to form a seal space between the members.

Further, the opening end face can be provided with a bank portion surrounding the opening of the through hole. In this case, the end face of the bank portion and the shaft surface flow blocking means face each other with a predetermined gap, and the amount of movement of the shaft It is preferable to set so as to regulate.
Furthermore, it is desirable that the outer diameter of the shaft surface flow blocking means is greater than or equal to the outer diameter of the bank.
Furthermore, it is preferable that the motor housing is provided with a drainage channel that opens at a lower portion of the seal space and communicates with the outside of the motor housing.

The pump device can be configured by including a pump housing that shares the partition member of the motor and directly coupling the impeller positioned in the pump housing to the shaft.
At this time, it is preferable to form a labyrinth seal between the partition member and the impeller.

  According to the present invention, even if there is water leaking through the seal member, the water flowing in the axial direction on the shaft is blocked by the shaft surface flow blocking means and cannot reach the bearing. Therefore, there is no risk of water entering the motor from the bearing, and durability and reliability are improved.

It is a longitudinal section showing the whole structure of an embodiment. It is the perspective view which looked at the shaft support partition from the motor housing side. It is an expanded sectional view showing the details around an oil seal. It is a cross-sectional perspective view showing the details around the oil seal. It is a front view of a stopper plate.

Next, an embodiment in which the present invention is applied to a pump device will be described.
FIG. 1 is a longitudinal sectional view showing the overall structure of the embodiment.
The pump device 1 includes a pump P and a motor M that drives the pump P.
The case 2 of the pump device 1 includes a motor housing 5 and a pump housing 6.
The first case 3 is in the form of a bottomed drum having an outer peripheral wall 3 a, and the motor housing 5 is formed by covering the opening with a shaft support partition 10. A pump housing 6 is formed by the shaft support partition wall 10 and the second case 4. That is, the shaft support partition 10 is shared by both housings, and the first case 3 and the second case 4 are opposed to each other with the shaft support partition 10 interposed therebetween, and are coupled to each other.
The three members of the first case 3, the second case 4, and the shaft support partition 10 are sequentially connected by a bayonet method using a plurality of claw portions in the circumferential direction, and are prevented from rotating by bolts or the like. In addition, the three members may be coupled simultaneously with a large number of bolts and nuts.

The shaft support partition 10 has a bulging portion 12 swelled on the pump housing 6 side. The bulging portion 12 includes a cylindrical outer peripheral wall 13 centering on a shaft 40 to be described later, and a disk portion 14 directed inward from the outer peripheral wall 13. A boss portion 15 is provided at the center of the disk portion 14. Have. An oil seal (JIS B2402 / ISO 6194 / Rotary Shaft Lip Type Seals) 20 as a seal member is held on the boss portion 15.
Further, a cylindrical portion 18 extends from the shaft support partition wall 10 into the motor housing 5. The cylindrical portion 18 is connected to the boss portion 15 at the base enlarged diameter portion 17.

The cylindrical portion 18 has a through hole 19 through which a shaft 40 of a rotor described later is passed, and bearings 26 and 27 that support the shaft 40 are provided at both ends of the through hole 19. The shaft 40 extends from the through hole 19 toward the pump housing 6.
Inside the boss portion 15, a seal space S is formed between the opening end face 50 (see FIG. 3 described later) of the through hole 19 and the oil seal 20.

A stator 30 having a coil 31b wound around a yoke 31a is attached to the outer periphery of the cylindrical portion 18.
A drum 34 having a cylindrical wall 35 positioned outside the stator 30 is coupled to the end of the shaft 40 protruding into the motor housing 5 from the tip of the cylindrical portion 18. A permanent magnet 36 is attached to the inner surface of the cylindrical wall 35 of the drum by bonding or the like, and the inner peripheral surface of the permanent magnet 36 is set to have a predetermined gap between the outer peripheral surface of the stator 30. A rotor 33 is formed by the drum 34, the permanent magnet 36 and the shaft 40.
The stator 30 and the rotor 33 form a motor M.

  A wiring connector (not shown) for connecting to the external power cable passes through the side wall of the motor housing 5 at a position different from the cross section of FIG. For this reason, as shown in FIG. 2 which is a perspective view of the shaft support partition wall 10 viewed from the motor housing 5 side, the wiring connector mounting portion 56 is formed in the shaft support partition wall 10. Although not particularly illustrated, a cutout corresponding to the mounting portion 56 of the wiring connector is formed on the outer peripheral wall 3a of the first case 3 to avoid interference.

On the other hand, the pump P is configured by attaching an impeller 60 to an end portion of the shaft 40 protruding into the pump housing 6 from the oil seal 20 of the shaft support partition 10.
The impeller 60 includes blades 63 on the outer surface (side away from the shaft support partition wall 10) of the base wall 61 having a hat-shaped cross section, and a coupling cylinder portion 65 extending from the top of the hat shape on the back surface side facing the shaft support partition wall 10. I have.

A knurl 41 is formed at the end of the shaft 40, and the impeller 60 is directly coupled to the shaft 40 by press-fitting the coupling cylinder 65 into the end of the shaft 40. Thereby, the impeller 60 becomes a cantilever structure held only from the motor side.
The impeller 60 and the shaft 40 can be connected by a spline, bolt connection, or the like in addition to the knurling 41.
In a state where the impeller 60 is coupled to the shaft 40, a predetermined gap is provided between the tip of the coupling cylinder portion 65 and the end surface of the boss portion 15 that holds the oil seal 20.

In the second case 4, the inner periphery of the side wall 4 a has a cylindrical shape, and the opening end thereof is fitted with the outer peripheral wall 13 of the bulging portion 12 of the shaft support partition wall 10 by an inlay. A seal ring 7 is provided on the fitting surface between the second case 4 and the outer peripheral wall 13.
The bottom wall 4b of the second case 4 is separated from the shaft support partition wall 10. The bottom wall 4b is provided with a water suction port 8 aligned with the extension line of the shaft 40, and the side wall 4a has a water discharge port. An outlet 9 is provided. As a result, the water flowing in from the water suction port 8 is discharged from the water discharge port 9 by the impeller 60 that is driven by the motor and rotates.

Further, two ring walls 67 and 68 centering on the coupling cylinder portion 65 are provided on the back surface side of the impeller 60, and extend in parallel in the axial direction to the same position as the tip of the coupling cylinder portion 65 at a predetermined interval. ing.
A ring wall 69 extends from the boss portion 15 of the bulging portion 12 such that the tip thereof faces between the two ring walls 67 and 68. The disk portion 14 of the bulging portion 12 is formed with a ring-shaped recess 70 so as to receive the tip of the ring wall 68 on the outer peripheral side of the impeller 60.
A labyrinth seal is formed by the ring walls 67, 68, 69 and the recess 70, so that the influence of the water flow does not directly affect the oil seal 20 portion.

Next, the details around the oil seal will be described.
3 is an enlarged sectional view around the oil seal 20, and FIG. 4 is a sectional perspective view of the same portion.
An oil seal holding portion 16 that opens to the pump housing 6 side is formed on the boss portion 15 of the shaft support partition wall 10, and its bottom wall serves as a butting portion 16 a.

The oil seal 20 is joined to the inner end of the metal ring 21 with the base portion 22 molded with an elastic body in a metal ring 21 having an L-shaped cross section made of, for example, SUS304 (JIS) and the elastic body of the base portion 22 being separated from each other. It is composed of elastic lips 23 and 24.
The oil seal 20 is positioned in the oil seal holding part 16 by elastically press-fitting the base part 22 until the tip of the base part 22 abuts against the abutting part 16a, and slides the lips 23 and 24 to the shaft 40. .
The inner peripheral wall 22a of the base portion 22 is inclined, and has a diameter equal to that of the inner peripheral wall 57 extending from the abutting portion 16a in the seal space S to the opening end surface 50 of the through hole 19 on the abutting portion 16a side. The smaller the distance from the portion 16a, the smaller the diameter.

The cylindrical portion 18 is connected to the boss portion 15 at the base enlarged diameter portion 17.
The bearing 26 that supports the shaft 40 is a cylindrical sliding oil-impregnated bearing, and is disposed on a bearing holding portion 49 that has an end portion of the through hole 19 that is enlarged in a counterbore shape on the base side of the cylindrical portion 18. The same applies to the bearing 27 on the distal end side of the cylindrical portion.

  A bank portion 52 that protrudes in the axial direction along the entire circumference of the opening edge of the bearing holding portion 49 is provided on the opening end surface 50 of the through hole 19 on the base portion 18 side. The outer diameter of the bank portion 52 is smaller than the inner peripheral diameter 57 between the abutting portion 16 a in the seal space S and the opening end surface 50 of the through hole 19, and therefore, between the bank portion 52 and the inner peripheral wall 57 of the seal space S. A ring-shaped groove 54 is formed.

A ring-shaped notch groove 43 is formed on the outer periphery of the shaft 40 between the bearing 26 and the oil seal 20, and a stopper plate 45 is engaged with the notch groove 43.
The stopper plate 45 is made of a disk-shaped polyslider (trade name), and has a hole 47 slightly smaller in diameter than the bottom diameter of the notch groove 43 of the shaft 40 as shown in FIG. A plurality of slits 48 are formed radially from the edge. The slit 48 is a cut in which the gap is closed in a free state.
The outer diameter of the stopper plate 45 is set to be equal to or larger than the outer diameter of the bank portion 52, and the stopper plate 45 is locked at a predetermined small gap between the axial end surface of the bank portion 52 and the stopper plate 45. Set to

  The stopper plate 45 is assembled by elastically expanding the hole 47 and fitting the shaft 40 from the tip of the pump housing 6 side before the oil seal 20 is attached. At this time, since the slit 48 is provided, the diameter of the hole 47 can be easily increased. The inner edge of the hole 47 of the stopper plate is in close contact with the bottom wall of the notch groove 43 in a state where it slides from the tip of the shaft 40 and is fitted in the notch groove 43. Also, the gap between the slits 48 is so small that water droplets do not pass therethrough.

  Next, a tunnel 80 is formed on the side of the shaft support partition wall 10 facing the motor housing 5, and an inner peripheral wall 57 whose one end extends between the abutting portion 16 a of the seal space S and the opening end surface 50 of the through hole 19. A straight hole 81 is formed in the tunnel 80 with the other end opening toward the outside of the motor housing 5. The straight hole 81 is simultaneously formed using a slide core when the shaft support partition 10 is molded.

In particular, as shown in FIG. 2, the outer shape of the tunnel 80 has a bead shape in which the wall surface of the shaft support partition 10 is raised and extends linearly from the boss portion 15. The outer wall facing the motor side of the tunnel 80 is flush with the wall surface of the enlarged diameter portion 17 of the cylindrical portion 18. The general cross section of the straight hole 81 is a quadrangle. As shown in FIG. 3, the straight hole 81 is wider than the opening to the seal space S in the direction parallel to the axis of the shaft 40, and is more inside the motor housing 5 than the opening end face 50 of the through hole. It is spreading. The straight hole 81 extends as a groove from the outer end of the tunnel.
The tunnel 80 extends in a direction different from the attachment portion 56 of the wiring connector.

As shown in FIG. 1, the outer end of the tunnel 80 is set to contact the outer peripheral wall 3 a of the first case 3. A notch 83 aligned with the straight hole 81 in the tunnel is formed at a portion of the outer peripheral wall 3a where the tunnel 80 abuts, and the tip from the outer end of the tunnel 80 extends as a groove 82. In FIG. 1, the side wall of the groove 82 is shown, but for the sake of simplicity, the bayonet claw 47 on the back side of the paper surface from the groove is not shown. As a result, the seal space S communicates with the outside of the motor housing 5 through a straight hole 81, a groove 82, and a notch 83 at a portion spaced from the wiring connector attachment portion 56. That is, the drainage channel D is formed by these straight holes 81 (and grooves 82) and the notches 83.
In the drainage channel D, when the pump device 1 is installed, the straight hole 81 opens at the bottom of the seal space S and faces vertically downward.

  Even if the water leaked from the pump housing 6 through the oil seal 20 is collected in the seal space S by this drainage channel D, it is immediately discharged to the outside of the case, so that the bearing 26 is accumulated and soaked in water. There is no. Further, since the drainage channel D discharges water directly to the outside of the case through an independent route, it does not enter the space where the coil wiring or the connection portion between the coil wiring and the wiring connector is accommodated.

Furthermore, since the drainage channel D is a straight line, the shaft 40 can be directly visually recognized from the outside of the case. Therefore, even after the pump device is assembled, the rotation speed and vibration of the shaft 40 can be measured by laser light irradiation.
That is, in the case of rotational speed measurement, a member with different reflection characteristics or an inclined surface with a different reflection angle is provided on a part of the circumferential direction of the shaft 40, or irregularities are provided in the circumferential direction or the surface roughness is changed. What is necessary is just to detect the change speed of reflected light intensity.
In the case of shake measurement, a reflection member may be provided on the entire circumference of the shaft 40 or at equal intervals in the circumferential direction, and a change in distance to the reflection member due to reflected light may be detected.

  In the pump device 1 configured as described above, since the stopper plate 45 fixed to the shaft 40 is provided between the oil seal 20 and the bearing 26, water flows from the pump housing 6 side through the oil seal 20. Even if there is a case where leakage occurs, water that tries to flow along the shaft 40 is blocked by the stopper plate 45 and does not reach the bearing 26.

When the shaft 40 rotates while the pump is operating, the water blocked by the stopper plate 45 is scattered by the centrifugal force and adheres to the peripheral wall of the seal space S. Since the inner peripheral wall 22a has a smaller diameter as the portion 22 is farther from the stopper plate 45, the water adhering to the upper portion of the base portion 22 flows in a direction away from the stopper plate 45 along the inclined inner peripheral wall 22a.
On the other hand, even if water adhering to the inner peripheral wall 57 extending between the abutting portion 16 a and the opening end surface 50 of the through hole 19 of the cylindrical portion 18 flows in the direction of the opening end surface 50 of the through hole 19, the bank portion 52 is still open to the opening end surface 50. Therefore, the bank portion 52 is not blocked by the bank portion 52 and reaches the bearing 26 of the through hole 19. Water flows down along the ring-shaped groove 54 formed between the inner peripheral wall 57 and the bank portion 52.

  In the present embodiment, the stopper plate 45 corresponds to the shaft surface flow blocking means in the invention. Further, the shaft support partition 10 corresponds to the partition member, the opening end surface 50 corresponds to the opening end surface on the base side of the through hole, the oil seal 20 corresponds to the sealing member, and the oil seal holding portion 16 corresponds to the sealing member holding portion. .

The embodiment is configured as described above. The bearing 26 is provided in the motor housing 5 that houses the stator 30 and the rotor 33, and the shaft 40 of the rotor 33 is horizontally supported by the bearing 26, and the shaft 40 is supported by the bearing 26. Since the disc-shaped stopper plate 45 is provided between the bearing 26 and the oil seal 20 in the motor that penetrates the oil seal 20 and extends to the outside of the motor housing 5, there is water that leaks through the oil seal 20. However, the water flowing in the axial direction on the shaft 40 is blocked by the stopper plate 45 and cannot reach the bearing 26. Accordingly, water intrusion into the motor is prevented, and the problem that the bearing 26 rusts and the shaft 40 does not rotate and the possibility of an electrical short circuit are eliminated, thereby improving durability and reliability.
In addition, since the shaft itself passes through the oil seal 20 as the output shaft of the motor, for example, when a separate shaft through the coupling or the like passes through the oil seal as the output shaft, the shaft runout is large. Thus, the oil seal is not damaged or deteriorated, and the cause of water leakage itself can be suppressed.

  The shaft support partition 10 includes an oil seal holding portion 16 that holds the oil seal 20, and a through hole 19 that holds the bearing 26 apart from the oil seal holding portion 16, and an opening end face 50 of the through hole 19. Since the water-tight seal space S is formed between the oil seal 20 and the oil seal 20, leaked water does not reach the coil wiring or the wiring connector.

  Since the opening end face 50 is provided with a bank portion 52 surrounding the opening of the through hole 19, water scattered by centrifugal force when the shaft 40 rotates travels along the inner peripheral wall 57 of the seal space S to the opening end face 50. Even if it flows, it will be blocked by the bank portion 52 and water intrusion to the bearing 26 will be more reliably prevented. This is when the installation posture of the pump device 1 is deviated and the motor M is positioned below the pump P side, so that the tendency for water to flow from the surrounding wall to the opening end face 50 increases. Especially effective.

Further, since the outer diameter of the stopper plate 45 is equal to or larger than the outer peripheral diameter of the bank portion 52, there is no possibility that water scattered from the rotating stopper plate 45 adheres to the end surface of the bank portion 52 and enters inside.
Therefore, the bank portion 52 cooperates with the stopper plate 45 to further improve durability and reliability.

Further, since the gap between the axial end surface of the bank portion 52 and the stopper plate 45 is set to be a predetermined small gap, the impeller 60 is pushed by the water pressure in the pump housing 6, and the shaft 40 moves in the direction of the motor housing 5. Since the stopper plate 45 comes into contact with the bank portion 52 when the impeller 60 is displaced to the position, further movement of the impeller 60 or the rotor 33 is restricted.
At this time, since the stopper plate 45 is made of a polyslider having a graphite layer on the surface, it exhibits high creep resistance, sliding characteristics and wear characteristics against pressure contact and sliding contact with the bank portion 52.

Since the motor housing 5 is provided with a drainage channel D that opens at a lower portion of the seal space S and communicates directly with the outside of the motor housing 5, water leakage does not accumulate in the seal space S and the bearing 26 is not submerged. .
Moreover, there is no possibility that the drainage will reach the coil wiring or the wiring connector due to the drainage route passing through an intermediate chamber.

Furthermore, the pump housing 6 that shares the shaft support partition wall 10 with the motor housing 5 is provided, and the impeller 60 positioned in the pump housing is directly coupled to the shaft 40, so that the pump device 1 having a simple case configuration is realized. At the same time, since the rotating shaft of the motor M and the drive shaft of the impeller 60 are the same shaft 40, the impeller 60 has a small vibration and a smooth rotational characteristic without vibration can be obtained.
And since the labyrinth seal is formed between the shaft support partition 10 and the impeller 60, the pressure fluctuation of the water flow in the pump housing 6 does not reach the oil seal 20, and water leakage in the oil seal portion is suppressed.

In the embodiment, the stopper plate 45 has a disk shape made of a polyslider. However, the material is not limited to this, and other resin or metal plate may be used. For example, in the case of a metal plate, it can be fixed by caulking or press fitting.
As the shaft surface flow blocking means, instead of the stopper plate 45, an elastic O-ring may be engaged with the notch groove 43 of the shaft, or a flange integral with the shaft 40 may be formed by header molding. . Also by these, a blocking effect against water flowing in the direction of the bearing 26 through the shaft 40 can be obtained.

  The motor housing 5 is formed by the bottomed drum-shaped first case 3 and the shaft support partition 10 that covers the opening, but is not limited thereto. For example, the shaft support partition is formed from the periphery thereof. The present invention is also applied as it is to a motor housing that is provided with a drum portion that extends to accommodate the rotor 33 and the stator 30, and the opening of the drum portion is closed with a flat cover member.

The bearings 26 and 27 are sliding oil-impregnated bearings, but may be ball bearings or roller / needle bearings depending on the required specifications of the motor.
In the impeller 60, the coupling cylinder portion 65 is coupled to the shaft 40 in the pump housing 6. However, the coupling cylinder portion extends into the seal space S, and the sliding contact partner of the oil seal lips 23 and 24 is the outer periphery of the coupling cylinder portion. You may make it become a plane.

  Further, the embodiment has been described by taking a pump device in which the motor M is assembled integrally with the pump P as an example. However, the present invention is not limited to the one integrated with the pump device, and the shaft protrudes from the oil seal to the outside. The present invention can be applied to various motors used in a use environment where the shaft is exposed to liquid.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Case 3 1st case 4 2nd case 4a Side wall 4b Bottom wall 5 Motor housing 6 Pump housing 7 Seal ring 8 Water suction port 9 Water discharge port 10 Shaft support partition 12 Swelling part 13 Outer peripheral wall 14 Disc part 15 Boss portion 16 Oil seal holding portion 16a Abutting portion 17 Expanded portion 18 Tube portion 19 Through hole 20 Oil seal 21 Metal ring 22 Base portion 22a Inner peripheral wall 23, 24 Lip 26, 27 Bearing 30 Stator 31 Coil 33 Rotor 34 Drum 35 Cylindrical wall 36 Permanent magnet 40 Shaft 41 Knurled 43 Notch groove 45 Stopper plate 47 Hole 48 Slit 49 Bearing holding part 50 Open end face 52 Bank part 54 Ring-shaped groove 56 Mounting part 57 Inner peripheral wall 60 Impeller 61 Base wall 63 Blade 65 Coupling cylinder Part 67 68, 69 ring wall 70 recess 80 tunnel 81 straight hole 82 groove 83 cutout D drainage M motor P pump

Claims (11)

In a motor in which a bearing is provided in a motor housing that houses a stator and a rotor, the shaft of the rotor is horizontally supported by the bearing, and the shaft extends from the bearing to the outside of the motor housing through a seal member.
A motor comprising shaft surface flow blocking means for blocking an axial flow of liquid on the shaft between the bearing and the seal member.   2. The motor according to claim 1, wherein the shaft surface flow blocking means is a disk-shaped stopper plate fitted into the shaft.   The motor according to claim 1, wherein the shaft surface flow blocking means is an O-ring locked to the shaft.   The motor according to claim 1, wherein the shaft surface flow blocking means is a flange formed integrally with the shaft. The motor housing includes a partition member having a seal member holding portion that holds the seal member and a through hole that is spaced apart from the seal member holding portion and holds the bearing.
5. The motor according to claim 1, wherein the partition wall member forms a seal space between the opening end face of the through hole and the seal member.   The motor according to claim 5, wherein a bank portion surrounding the opening of the through hole is provided on the opening end surface.   The motor according to claim 6, wherein the end face of the bank portion and the shaft surface flow blocking means are opposed to each other with a predetermined gap, and the movement amount of the shaft is regulated.   The motor according to claim 6 or 7, wherein an outer diameter of the shaft surface flow blocking means is equal to or larger than an outer diameter of the bank portion.   The motor according to any one of claims 5 to 8, wherein the motor housing is provided with a drainage channel that opens at a lower portion of the seal space and communicates directly with the outside of the motor housing. A pump housing that shares the partition member of the motor according to any one of claims 5 to 9,
An impeller disposed in the pump housing is directly coupled to the shaft.   The pump device according to claim 10, wherein a labyrinth seal is formed between the partition member and the impeller.

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