JPH011439A - motor ventilator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, the housing of a rotary electric M1 machine is of the roofless type, i.e., using an assembly consisting of a frame and a bearing bracket.
It constituted an open drip-proof enclosure. In such a known structure, the frame and bearing bracket are special products exclusively for open type drip-proofing.
If a fully clad construction is required, new frame members and new bearing brackets will be required. Therefore, machine enclosure parts such as frame members and bearing brackets must be kept individually in stock, which increases costs and complicates inventory management.

Furthermore, the open drip-proof structure of the bearing bracket in particular has poor cooling performance due to the relatively small diameter of the air inlet opening, and this small diameter air inlet opening is located below the center of the shaft, i.e. In the case of horizontal mounting, since the device is usually placed near the base of the device, there is a problem in that the device is easily contaminated by dust and foreign matter on the mounting surface.

The present invention solves the above-mentioned drawbacks of the known open type drip-proof structure, and uses a fully covered support bracket in the open type drip-proof structure and installs the air inlet opening above the center of the shaft. ing. This new configuration increases cooling efficiency, reduces the possibility of contamination of the machine with dirt on the machine mounting surface when the shaft is mounted horizontally, and is fully enclosed with an open drip-proof machine. Reduces the number of parts required in inventory by allowing the use of bearing brackets. In addition, the present invention
For example, it is useful for any electrical machine that uses cooling air, such as motors, generators, electromagnetic clutches, and brakes.

1A-1C illustrate a known open drip-proof motor enclosure 10 having a frame 12 and a pair of open drip-proof bearing brackets 14,16. These brackets 14.16
each has a shaft 225 within the housing or enclosure.
: Holds bearings 18 and 20 that are rotatably supported.

Air flows into enclosure 10 in front of openings 24-28 in bracket 14 and openings 30, 32 in bracket 16, respectively.
flow inside. The cooling air flowing into the enclosure 10 flows along the stator 36 through a fan 34 attached to the rotor.

It flows out from the boat 38 to the outside.

2A-2C illustrate an open, drip-proof rotary electric machine, specifically a horizontal axis electric motor 40, in accordance with the present invention. The motor 40 has a shaft 42 which has bearings 44, 46 arranged in bearing brackets 48, 50.
is rotatably supported by. This shaft 42 has
A rotor 52 that rotates integrally with this is attached.

This rotor 52 supports fans 54 , 56 which force air radially towards the stator 58 . The stator 58 is the frame member 6
0, the frame member 60 has a pair of air flow rings or air inlet rings 62.6 mounted at opposite ends.
It has 4. Instead of attaching the airflow ring to both ends of the mechanical enclosure, it is attached to only one end of the machine enclosure, resulting in a single-end cooling scheme. FIG. 2B shows the end face of ring 62. The frame member 6o further has a plurality of lands, ie, spacers (separating protrusions) 66, and the bearing bracket 48 is attached to these lands 66. Specifically, bracket 48 is secured to frame member 60 by securing bolts 68 within lands or bosses 66. These lands 66 are attached to the frame member 6o.
The bearing bracket 5o, which may be constructed as an integral part or separate from the bearing bracket 5o, is also fixed to the frame 60 in the same manner as the bracket 48. As clearly shown in FIGS. 2A and 2C, a plurality of boats 70 are provided to direct cooling air out of the motor 40.

In this embodiment, cooling air enters the motor 40 generally axially between the bearing bracket 48 and the ring 62 and then radially inwardly between the surface 72 of the frame member 60 and the inner surface 74 of the bracket 48. and then between the stator shroud or air deflector 76 (which may be constructed from a toroidal surface of sheet metal, fiberglass, or other suitable material) and the inner surface 75 of the bearing bracket 48. pass through. The cooling air thus entered is directed radially outwardly by fan 54 and then directed generally axially across stator 58 . In this way, the cooling air finally flows out to the outside at the boat 70. In the configuration above zero, it goes without saying that the cooling air is propelled by the fans 54 and 56.

FIG. 3 shows another embodiment in which a shaft-mounted fan 78 is provided.

This fan 78 directs air to both stator 80 and rotor 82. The rotor 82 includes an axial passage 84 and a radial passage 86 through which cold BI air flows through the rotor 82 . Stator 80 also has radial passages 88 that are aligned and in communication with the radial passages 86 described above. A rotor-mounted fan 90 may be used in place of or in addition to the axial-mounted fan 78 described above.

FIG. 4 shows an embodiment suitable for the vertical axis type, in which the frame 60- is not provided with a ring 62, and the droplet cover 100 is preferably made of a thin sheet metal, This cover 100 has screws or rivets 10.
2 to the bracket 48 or, if necessary, to a land or spacer 66.

Further, instead of this configuration, the cover 100 may be cast and integrated with the frame member 60-.

In this vertical shaft type, the air outlet boat is made vertically drip-proof by installing one or more shielding members, such as louvers or rain covers, preferably made of thin sheet metal, by a known method. be able to.

The present invention can be modified and changed without departing from the scope of the invention, so it is not limited to the configuration of the Mi part of the above embodiment. The air passage 92 may be extended into the air outlet passage by extending the air deflector 94 as shown by the double dashed line 96 and by extending the air deflector 94 into the air outlet passage.
In such a configuration, the boats 70 may be spaced apart from each other; another alternative is that the boats 70t! : can be used as an air outlet, and the air passages 92,93 can also be used as air outlets.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional end view of a known bearing bracket. FIG. 1B is a partially cutaway side view showing the air circulation inside the known bracket, and FIG. 1C is a side view showing a cooling air discharge passage inside the known bracket. FIG. 2A is a partially cutaway side view of one embodiment of the present invention, showing the 111 structure of the inlet airflow passage. FIG. 2B is an end view of the frame member of FIG. 2A, and FIG. 2C is a cross-sectional view of the frame member of FIG. 2A, showing the outlet air passageway. FIG. 3 is a partially cut-away four side view of another embodiment of the rotating electrical machine of the present invention, showing the inlet air flow passage. FIG. 4 is a partial view of yet another embodiment of the present invention, showing a structure suitable for a vertical axis. [Explanation of symbols of main parts J 40...Motor. 42.--Axis. 48.50...Bearing bracket. 52.82...Rotor. 54.56...Fan. 58.80...Stator. 60...Frame member. 62.64...Air inlet ring. 66...land. 76...Deflector. -Procedure-'? r)j IE? -9 Showa 63
July 22 [1 Yoshi, Commissioner of the Japan Patent Office 1) Moon Takeshi 1,! IG Display 1988 Patent Application No. 122153 217!1
Name of j1: Nanana-Yu Ventilator 3, Relationship with the supplementary case 1) Moon Takeshi I Case Description 1986 Patent Application No. 122153 2 Title of Invention Motor Ventilator 3 Person making the amendment Relationship to the case: Patent Applicant Name Title Magnetic, Incorporated 4 Agent 〒100 ( 1) Amend the "Claims" as shown in the attached sheet. 2. Scope of Claims 1. In an air flow path structure for cooling an open drip-proof rotating electrical machine having a fully covered bearing bracket, there is no opening for air flow through the bearing bracket and the frame member is axially attached to the bearing bracket. an axially projecting air flow ring spaced radially outwardly from the radially extending aperture, the spacing forming a radially extending aperture; An air flow passage structure, characterized in that it is fixed to an assembly consisting of a bracket and the frame member, thereby introducing external cooling air into the interior of the machine. 2. The air flow ring overlaps the radially extending opening between the bearing bracket and the frame member, and the amount of overlap prevents vertically falling liquid from entering the interior of the machine. 2. The passage structure according to claim 1, wherein the passage structure is configured such that the passage structure can be moved freely. 3. The passageway structure of claim 1, wherein said radially extending opening extends along most of the circumference of said frame member. 4. The passage includes an opening extending substantially in the direction,
2. The passageway structure of claim 1, wherein said directionally extending opening is located upstream of said radially extending opening and radially inward of said airflow ring. 5. The bearing bracket is attached to the frame member by a plurality of lands spaced apart from each other in the circumferential direction, and these lands are located axially between the bearing bracket and the frame member. The structure according to claim 4 characterized by: 6. The first portion of the radially extending opening is formed by separating a surface of the bearing bracket and a surface of the frame member opposing the bearing bracket in the axial direction by the land. The passage structure according to claim 5, characterized by: 7. The passage structure according to claim 6, wherein the first portion of the radially extending opening is a substantially arc-shaped opening divided by the land. 8. The machine includes a plurality of rotating parts, and the radially extending opening further includes a second part located radially inward so as to communicate with the first part, and the machine includes a second part located radially inwardly so as to communicate with the first part, The fan installed in one directs the cooling air to the second fan.
The passage structure according to claim 1, characterized in that air is blown to certain parts. 9. The passage structure according to claim 8, wherein the two rotating parts are rotors. 10. The passage structure according to claim 8, wherein the two rotating parts are shafts. 11. The second portion of the radially extending opening is formed by a surface of the bearing bracket and a surface of the air deflector both extending generally radially and spaced apart from each other. A passage structure according to claim 8. 12. The passage structure according to claim 11, wherein the air deflector has a toroidal surface. 13. An open drip-proof rotating electric machine comprising a frame member supporting a stator and a pair of fully covered bearing brackets supporting a rotor, an air inlet ring located at one axial end of the frame member; and the ring is radially outwardly spaced from and axially overlaps one of the pair of bearing brackets, thereby forming an axially extending air inlet opening. an air inlet passageway structure, wherein the axially extending air inlet opening introduces external cooling air into the interior of the fully enclosed bearing bracket and the frame member of the machine; 14. The passageway structure of claim 13, wherein the air inlet opening extends over more than 50% of the outer periphery of the bearing bracket. 15. further comprising a generally radially extending opening formed by means for axially (m) disposed between said frame member and said one bearing bracket, said radially extending opening being 14. The passageway structure of claim 13, wherein the passageway structure is located radially inward of the air inlet ring and downstream of the air inlet opening. 16. The passage structure according to claim 15, further comprising a plurality of mounting bosses arranged axially between the member and the one bearing bracket and around the one bearing bracket. 17. A double-end ventilation device for an open type drip-proof rotating electric machine, which includes: a. a pair of rings forming an axial extension of the motor frame member at both axial ends of the motor frame member; and b. completely covered. a pair of bearing brackets, each of the pair of bearing brackets is (a) disposed at one end of the frame member in the axial direction, and (b) spaced apart radially inwardly from both the rings. 18. Each of the bearing brackets is configured to form an axially extending air inlet opening for introducing external cooling air between the ring and the bracket into the interior of the v1 machine.18. , spaced apart from the frame member in the axial direction on the inside of the ring;
18. The ventilation device according to claim 17, wherein this forms an opening extending substantially radially inwardly of said axially extending opening. 19. The ventilation device according to claim 17, wherein at least one of the axially extending openings is an air inlet opening. 206. Claim 18, wherein said generally radially extending opening is formed by an internal surface of said bearing bracket and surfaces of a pair of air deflectors being axially spaced from each other. Ventilation device as described in section. 21. The machine includes a shaft pivotally supported by the bearing bracket, and the generally radially extending opening directs incoming cooling air to at least one fan that rotates integrally with the shaft. A ventilation device according to claim 20.

Claims (1)

[Claims] 1. In an air flow path structure for cooling an open drip-proof rotating electric machine having a fully covered bearing bracket, there is no opening for air flow through the bearing bracket, and the frame members are axially spaced mounted to the bearing bracket, the spacing forming a radially extending aperture, and an axially projecting air flow ring extending radially outwardly from the radially extending aperture. an air flow passage structure spaced apart from each other and fixed to an assembly comprising the bearing bracket and the frame member, thereby introducing external cooling air into the interior of the machine; 2. The airflow ring overlaps the radially extending opening between the bearing bracket and the frame member, and the amount of overlap prevents vertically falling liquid from entering the interior of the machine. The passage structure according to claim 1, characterized in that the passage structure is selected so as to prevent. 3. The passageway structure of claim 1, wherein said radially extending opening extends along most of the circumference of said frame member. 4. The passage includes an opening extending substantially in the direction,
2. The passageway structure of claim 1, wherein said directionally extending opening is located upstream of said radially extending opening and radially inward of said air flow ring. 5. The bearing bracket is attached to the frame member by a plurality of lands spaced apart from each other in the circumferential direction, and these lands are located axially between the bearing bracket and the frame member. The structure according to claim 4 characterized by: 6. The first portion of the radially extending opening is formed by separating a surface of the bearing bracket and a surface of the frame member opposing the bearing bracket in the axial direction by the land. A passage structure according to claim 5. 7. The passage structure according to claim 6, wherein the first portion of the radially extending opening is a substantially arc-shaped opening divided by the land. 8. The machine includes a plurality of rotating parts, and the radially extending opening further includes a second part located radially inward to communicate with the first part, and the machine includes a second part located radially inwardly so as to communicate with the first part, The fan installed in one directs the cooling air to the second fan.
The passage structure according to claim 1, characterized in that air is blown to certain parts. 9. The passage structure according to claim 8, wherein the one rotating component is a rotor. 10. The passage structure according to claim 8, wherein the one rotating component is a shaft. 11. The second portion of the radially extending opening is formed by a surface of the bearing bracket and a surface of the air deflector both extending generally radially and spaced apart from each other. A passage structure according to claim 8. 12. The passage structure according to claim 11, wherein the air deflector has a toroidal surface. 13. An open drip-proof rotating electric machine comprising a frame member supporting a stator and a pair of fully covered bearing brackets supporting a rotor, an air inlet ring located at one axial end of the frame member; the ring is radially outwardly spaced from and axially overlaps one of the pair of bearing brackets, thereby forming an axially extending air inlet opening; and the axially extending air inlet opening introduces external cooling air into the interior of the fully enclosed bearing bracket and the frame member of the machine. 14. The passageway structure of claim 13, wherein the air inlet opening extends over more than 50% of the outer periphery of the bearing bracket. 15. further comprising a generally radially extending aperture formed by a spacing means axially located between said frame member and said one bearing bracket, said radially extending aperture being formed in said air inlet ring; 14. The passage structure of claim 13, wherein the passage structure is located radially inward of and downstream of the air inlet opening. 16. The spacing means includes a plurality of mounting bosses arranged axially between the frame member and the one bearing bracket and around the one bearing bracket. Passage structure according to scope item 15. 17. A double-end ventilation device for an open type drip-proof rotating electric machine, which includes: a. a pair of rings forming an axial extension of the motor frame member at both axial ends of the motor frame member; and b. completely covered. a pair of bearing brackets, each of the pair of bearing brackets is (a) disposed at one end of the frame member in the axial direction, and (b) spaced apart radially inwardly from both the rings. forming an axially extending air inlet opening for introducing external cooling air between the ring and the bracket and into the interior of the machine. 18. Each of the bearing brackets is axially spaced from the frame member inside the ring;
18. The ventilation device according to claim 17, wherein this forms an opening extending substantially radially inwardly of said axially extending opening. 19. The ventilation device according to claim 18, wherein at least one of the axially extending openings is an air inlet opening. 20. The generally radially extending opening is formed by the inner surface of the bearing bracket and the surfaces of the pair of air deflectors being axially spaced apart from each other. A ventilation device according to scope item 19. 21. The machine includes a shaft pivotally supported by the bearing bracket, and the generally radially extending opening directs incoming cooling air to at least one fan that rotates integrally with the shaft. A ventilation device according to claim 20.