JP5583823B2 - Motor and pump equipment - Google Patents

Description

  The present invention relates to a motor and a pump device.

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 leaking into the recess through the oil seal portion flows through the inclined surface and is discharged out of the recess through the discharge hole, while the drive motor is disposed at a position higher than the oil seal. Water does not reach the current-carrying parts such as the coil wiring and the connection part between the wiring and the wiring connector.

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, if the pump device is placed horizontally, the motor is housed in the recess itself and the current-carrying part is not covered. May affect these.

  Accordingly, an object of the present invention is to provide a motor in which waterproofing to functional parts such as a current-carrying part is ensured in the horizontal arrangement of the shaft in view of the above-described problems.

According to the present invention, the motor housing that houses the stator and the rotor 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. In the motor which horizontally supports the shaft of the rotor and extends the shaft from the bearing and penetrates the seal member,
The motor housing is configured by covering an opening of a bottomed drum-shaped case with the partition member,
The partition member is provided with a cylindrical portion that extends from the opening side of the bottomed drum-shaped case to the vicinity of the bottom portion of the case, holds the bearing inside the cylindrical portion, and on the outer periphery of the cylindrical portion. The stator having a coil wound around a yoke is attached, and a drum having a permanent magnet attached to the outside of the stator is coupled to the end of the shaft protruding from the tip of the cylindrical portion into the case. Configure
Storing the stator and the rotor between the cylindrical portion and the case in the radial direction of the rotor;
The sealing space is formed between the opening end surface and the sealing member of the through hole in the tube portion,
Provided in the partition member a cylindrical drainage channel that opens at the bottom of the seal space and communicates with the outside of the case ,
The said drainage channel is opening below the said opening of the said through-hole, The motor characterized by the above-mentioned .

  According to the present invention, even if there is water leaking through the seal member, since the space between the opening end face of the through hole and the seal member is a watertight seal space, the motor side is not at a high position because the shaft is horizontal. However, the leaked water will not be applied to the current-carrying part.

It is a longitudinal section showing the whole structure of an embodiment. It is a section perspective view of an embodiment. It is an external appearance perspective view 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 around a shaft support partition.

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, FIG. 2 is a perspective view of the same section, and FIG. 3 is an external perspective view.
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.
In the boss portion 15, an oil seal (JIS B2402 / ISO6194 / Rotaryshaftliptypes) 20 as a seal member is held in an oil seal holding portion 16 opened on the pump housing 6 side. The oil seal 20 is held in a recessed position and retracted from the open end.
On the other hand, a cylindrical portion 18 extends from the shaft support partition 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 and penetrates the oil seal 20.
Inside the boss portion 15, a seal space S is formed between the opening end face 50 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 an external power cable passes through the side wall of the motor housing 5 at a position different from the cross section of FIG. Therefore, as shown in FIG. 4, which is a perspective view of the shaft support partition wall 10 as viewed from the motor housing 5 side, the wiring connector mounting portion 56 is formed in the shaft support partition wall 10. On the outer peripheral wall 3a of the first case 3, an attachment half 45 (see FIG. 3) corresponding to the attachment portion 56 of the wiring connector is formed.

FIG. 4 shows a tunnel 80 for a drainage channel extending from the shaft support partition 10 in a direction different from the wiring connector mounting portion 56. The outer shape of the tunnel 80 is a bead shape in which the wall surface of the shaft support partition wall 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 end face of the enlarged diameter portion 17 of the cylindrical portion 18. The drainage channel will be described in detail later.
In the figure, 47 is a bayonet claw.

On the other hand, a resin impeller 60 is attached to an end of the shaft 40 extending from the bearing 26 to the pump housing 6 side.
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. Further, on the back surface side of the impeller 60 facing the shaft support partition wall 10, a large diameter portion 67 is provided with a coupling cylinder portion 65 having a smaller diameter than this and a metal tube 66 molded on the outer periphery thereof. A ring wall 68 spaced radially outward from the outer wall.

  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 M side.

In a state where the impeller 60 is coupled to the shaft 40, the blade 63, the large diameter portion 67 and the ring wall 68 are located in the pump housing 6, while the coupling cylinder portion 65 penetrates the oil seal 20 and the tip thereof is a cylinder portion 18 extends to the vicinity of the opening end face 50 of the through hole 19. The metal cylinder 66 is a sliding surface with the lip of the oil seal 20.
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 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. Thereby, the water that flows 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 M and rotates.

The large diameter portion 67 of the impeller 60 is set smaller than the opening diameter of the oil seal holding portion 16 and faces the opening of the oil seal holding portion 16.
A ring-shaped recess 70 is formed in the disk portion 14 of the bulging portion 12 so as to receive the tip of the ring wall 68 of the impeller 60. The recess 70 and the opening of the oil seal holding part 16 are adjacent to each other. For this reason, the opening part of the oil seal holding part 16 forms a ring wall 69 and enters between the large diameter part 67 of the impeller 60 and the ring wall 68. It is in a state.
A labyrinth seal is formed by the ring wall 68 and the large-diameter portion 67 of the impeller 60 and the concave portion 70 and the ring wall 69 of the shaft support partition 10, and the influence of the water flow in the pump housing 6 directly affects the oil seal 20 portion. I am trying not to.

Next, the details around the oil seal will be described.
FIG. 5 is an enlarged cross-sectional view around the shaft support partition 10.
The oil seal holding part 16 of the shaft support partition 10 has a bottom wall as a butting part 16a.
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 the lip 23, 24 is inserted into the impeller 60 as described above. Are brought into sliding contact with the metal cylinder 66 of the connecting cylinder portion.
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.

Next, a tunnel 80 having a straight hole 81 formed therein is provided on the side of the shaft support partition 10 facing the motor housing 5. As shown in FIG. 5, the straight hole 81 has one end 81a that opens to the inner peripheral wall 57 having a circular cross section extending from the abutting portion 16a of the seal space S to the opening end surface 50 of the through hole 19, and the other end 81b. However, it opens toward the outside of the motor housing 5.
The straight hole 81 is arranged on a line passing through the axis of the shaft 40, and the straight hole 81 is simultaneously formed using a slide core when the shaft support partition 10 is molded.

The general cross section of the straight hole 81 is a square, and extends from the outer end 80 a of the tunnel 80 as a groove 82. 1 and 5 show the side wall of the groove 82, but the bayonet claw 47 and the like on the back side of the paper surface from the groove are omitted for simplicity.
Further, as shown in FIG. 5, 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 closer to the inner side of the motor housing 5 than the opening end surface 50 of the through hole (in the drawing, left )).

The outer end 80 a of the tunnel 80 is set so as 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. 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 reach the energizing part or the like on the way.

Furthermore, since the straight hole 81 faces the axial center of the shaft 40 and the coupling tube portion 65 of the impeller 60 coupled to the shaft 40 or the shaft is directly visible from the outside of the case through the drainage channel D, even after the pump device is assembled. The rotation speed and vibration of the shaft 40 and the impeller 60 can be measured by laser light irradiation.
That is, in the case of measuring the rotational speed, a member having a different reflection characteristic or an inclined surface having a different reflection angle is provided on a part of the shaft 40 or the coupling cylinder portion 65 in the circumferential direction, or an uneven surface is provided in the circumferential direction. What is necessary is just to detect the change rate of reflected light intensity, setting to the specification which changed the roughness.
In the case of shake measurement, a reflecting member may be set on the entire circumference or at equal intervals in the circumferential direction of the shaft 40 or the coupling tube portion 65, and a change in distance to the reflecting member due to reflected light may be detected.

In the pump device 1 configured as described above, when the shaft 40 is rotating while the pump is operating, the water leaking from the pump housing 6 side is scattered by the centrifugal force from the coupling cylinder portion 65 and sealed space S. However, since the inner peripheral wall 22a of the base portion 22 of the oil seal 20 becomes smaller in the distance from the abutting portion 16a, the water adhering to the upper portion of the base portion 22 is inclined to the inclined inner peripheral wall 22a. Accordingly, the oil falls to the bottom of the base portion 22 of the oil seal 20 while flowing away from the bearing 26. Since the inner peripheral wall 22a of the base portion is inclined, the dropped water flows in the direction of the motor housing 5 as opposed to adhering to the upper portion, and is discharged from the case through the drainage channel D from the opening 81a of the straight hole 81 in front of the water. Drained into
When the shaft 40 is not rotating, the water directly falls to the bottom of the inner peripheral wall 22a of the base portion, and thereafter is similarly drained out of the case through the drainage channel D.

  In the present embodiment, the shaft support partition 10 corresponds to the partition member in the invention. The oil seal 20 corresponds to a seal member, and the oil seal holding part 16 corresponds to a seal member holding part.

  The embodiment is configured as described above, and the motor housing 5 that houses the stator 30 and the rotor 33 of the motor is separated from the oil seal holding portion 16 that holds the oil seal 20 and the oil seal holding portion, and holds the bearing 26. A shaft supporting partition wall 10 having a through-hole 19 for supporting the shaft 40 of the rotor horizontally on the bearing 26, extending the shaft 40 from the bearing 26 and penetrating the oil seal 20. In addition, a seal space S is formed between the opening end face 50 of the through hole 19 and the oil seal 20, and a drainage channel D that opens to a lower portion of the seal space S and communicates directly with the outside of the motor housing 5 is provided. Since the shaft supporting partition 10 is provided in a tunnel shape, even if there is water leaking through the oil seal 20 Water is never exerted on such conductive portion from watertight seal space S.

  The leaked water can reach the bearing 26 in the through hole 19 that opens into the seal space S. However, the leaked water is directly discharged from the seal space S to the outside of the motor housing 5 through the drainage channel D. Needless to say, the bearing 26 is not soaked in water, and there is no risk of water entering the motor M through the bearing 26.

  Further, in the seal space S, the drainage channel D is below the opening of the through hole 19 and opens at the bottom of the seal space S, so that water leaking into the seal space S is immediately discharged, Therefore, it does not accumulate. For this reason, even if the hot water leaks, there is no risk that the steam from the hot water will enter the motor through the bearing 26 of the through hole 19 and corrosion of the metal parts such as the shaft 40 and water itself, Alternatively, there is no possibility that the water staying installed outside freezes and the shaft 40 is fixed, the oil seal 20 is damaged, the shaft support partition 10 is damaged due to expansion, and the like.

  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.

  Further, since the coupling cylinder portion 65 of the impeller 60 extends through the oil seal 20 into the seal space S, it can be coupled to the shaft 40 at a portion close to the bearing 26, thereby further suppressing the rotational vibration of the impeller 60 to be small. It is done.

Further, since the drainage channel D is linear from the opening to the seal space S to the outer end, it can be easily formed when the shaft support partition 10 is molded using a slide core.
And since the drainage channel D is provided on the line | wire which can visually recognize the shaft 40 or the coupling cylinder part 65 in the seal space S from the outer end, the rotation speed and vibration of the shaft 40 and the impeller 60 are radiated by laser light irradiation. Can be measured.

  Moreover, 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 addition, in embodiment, although the general cross section of the straight hole of a drainage channel was made into square, it is not limited to this, A circular cross section and other arbitrary cross-sectional shapes can be employ | adopted.
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.
The impeller 60 extends its coupling cylinder portion 65 into the seal space S, and the oil seal lips 23 and 24 are in sliding contact with the metal cylinder on the outer periphery of the coupling cylinder section. However, the impeller is coupled to the shaft 40 in the pump housing 6. However, the sliding contact partner of the oil seal lips 23, 24 may be the shaft 40.

  The straight hole of the drainage channel D is a range where the lower edge of the opening to the seal space S is lower than the lower edge of the through hole 19 so that the water surface in the seal space S does not reach the through hole 19 depending on the use environment. Thus, it may be opened to the side surface of the seal space S and extend obliquely. However, as in the embodiment, it is assumed that it opens to the bottom of the seal space S and faces vertically downward. It is more preferable in that it does not cause retention of water that causes freezing.

  Furthermore, although the embodiment has been described by taking a pump device in which the motor M is integrally assembled with the pump P as an example, 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 3a Perimeter wall 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 Expansion part 13 Outer wall 14 Disk part 15 Boss part 16 Oil seal holding part 16a Abutting part 17 Expanded part 18 Tube part 19 Through hole 20 Oil seal 21 Metal ring 22 Base part 22a Inner peripheral wall 23, 24 Lip 26, 27 Bearing 30 Stator 31a York 31b Coil 833 Rotor 34 Drum 35 Cylindrical wall 36 Permanent magnet 40 Shaft 41 Knurl 45 Mounting half 47 Bayonet claw 49 Bearing holding section 50 Open end face 56 Mounting section 57 Inner peripheral wall 60 Impeller 61 Base wall 63 Blade 65 Binding cylinder section 66 Metal cylinder 67 Large Diameter portion 68 Ring wall 69 Ring wall 70 Recess 8 0 Tunnel 81 Straight hole 82 Groove 83 Notch D Drainage channel M Motor P Pump S Seal space

Claims (8)

A motor housing that houses the stator and the rotor has a partition member that includes 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. In the motor that horizontally supports the shaft and extends the shaft from the bearing and penetrates the seal member,
The motor housing is configured by covering an opening of a bottomed drum-shaped case with the partition member,
The partition member is provided with a cylindrical portion that extends from the opening side of the bottomed drum-shaped case to the vicinity of the bottom portion of the case, holds the bearing inside the cylindrical portion, and on the outer periphery of the cylindrical portion. The stator having a coil wound around a yoke is attached, and a drum having a permanent magnet attached to the outside of the stator is coupled to the end of the shaft protruding from the tip of the cylindrical portion into the case. Configure
Storing the stator and the rotor between the cylindrical portion and the case in the radial direction of the rotor;
The sealing space is formed between the opening end surface and the sealing member of the through hole in the tube portion,
Provided in the partition member a cylindrical drainage channel that opens at the bottom of the seal space and communicates with the outside of the case ,
The said drainage channel is opening below the said opening of the said through-hole, The motor characterized by the above-mentioned . The motor according to claim 1 , wherein the drainage channel is opened at the bottom of the seal space. The drainage channel is motor according to claim 1 or claim 2, characterized in that it is formed in a straight line until the outer end from the opening to the sealing space. A pump housing sharing the partition member of the motor according to any one of claims 1 to 3 , wherein an impeller positioned in the pump housing is directly coupled to the shaft. Pump device. The pump device according to claim 4 , wherein the impeller includes a coupling cylinder portion coupled to the shaft, and the coupling cylinder portion extends through the seal member into the seal space. The pump device according to claim 4 or 5 , wherein the drainage channel is formed linearly from an opening to the seal space to an outer end. The pump device according to claim 6 , wherein the drainage channel is provided on a line through which the shaft or the coupling cylinder portion in the seal space can be visually recognized from an outer end thereof. The pump device according to claim 7 , wherein a labyrinth seal is formed between the partition member and the impeller.

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